Merge branch 'development' into 'feature/issue_73'

# Conflicts:
#   build.gradle
#   pdf-as-pdfbox-2/src/main/java/at/gv/egiz/pdfas/lib/impl/signing/pdfbox2/PADESPDFBOXSigner.java

11 files changed, 1471 insertions, 1086 deletions

diff --git a/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/helper/PdfAsHelper.java b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/helper/PdfAsHelper.java
index 2f7c9323..35b5a7ce 100644
--- a/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/helper/PdfAsHelper.java
+++ b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/helper/PdfAsHelper.java
@@ -23,19 +23,68 @@
  ******************************************************************************/
 package at.gv.egiz.pdfas.web.helper;
 
-import at.gv.egiz.pdfas.api.ws.PDFASSignParameters;
+import java.awt.Image;
+import java.awt.image.RenderedImage;
+import java.io.ByteArrayOutputStream;
+import java.io.File;
+import java.io.IOException;
+import java.io.StringWriter;
+import java.io.UnsupportedEncodingException;
+import java.net.URL;
+import java.net.URLEncoder;
+import java.security.cert.CertificateException;
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
+
+import javax.imageio.ImageIO;
+import javax.servlet.RequestDispatcher;
+import javax.servlet.ServletContext;
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import javax.servlet.http.HttpSession;
+import javax.xml.bind.JAXBElement;
+import javax.xml.ws.WebServiceException;
+
+import org.apache.commons.codec.binary.Base64;
+import org.apache.commons.io.FileUtils;
+import org.apache.commons.io.IOUtils;
+import org.apache.commons.lang3.StringEscapeUtils;
+import org.apache.commons.lang3.StringUtils;
+import org.apache.http.entity.ContentType;
+
+import com.google.gson.JsonArray;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import com.google.zxing.WriterException;
+
+import at.gv.egiz.pdfas.api.processing.CoreSignParams;
+import at.gv.egiz.pdfas.api.processing.DocumentToSign;
+import at.gv.egiz.pdfas.api.processing.PdfasSignRequest;
+import at.gv.egiz.pdfas.api.processing.PdfasSignResponse;
+import at.gv.egiz.pdfas.api.processing.PdfasSignResponse.PdfasSignResponseBuilder;
+import at.gv.egiz.pdfas.api.processing.SignedDocument;
 import at.gv.egiz.pdfas.api.ws.PDFASSignParameters.Connector;
-import at.gv.egiz.pdfas.api.ws.PDFASSignResponse;
 import at.gv.egiz.pdfas.api.ws.PDFASVerificationResponse;
 import at.gv.egiz.pdfas.common.exceptions.PDFASError;
+import at.gv.egiz.pdfas.common.exceptions.PdfAsException;
 import at.gv.egiz.pdfas.common.utils.PDFUtils;
-import at.gv.egiz.pdfas.lib.api.*;
+import at.gv.egiz.pdfas.lib.api.ByteArrayDataSource;
+import at.gv.egiz.pdfas.lib.api.Configuration;
+import at.gv.egiz.pdfas.lib.api.IConfigurationConstants;
+import at.gv.egiz.pdfas.lib.api.PdfAs;
+import at.gv.egiz.pdfas.lib.api.PdfAsFactory;
+import at.gv.egiz.pdfas.lib.api.StatusRequest;
 import at.gv.egiz.pdfas.lib.api.sign.IPlainSigner;
 import at.gv.egiz.pdfas.lib.api.sign.SignParameter;
 import at.gv.egiz.pdfas.lib.api.sign.SignResult;
 import at.gv.egiz.pdfas.lib.api.verify.VerifyParameter;
 import at.gv.egiz.pdfas.lib.api.verify.VerifyParameter.SignatureVerificationLevel;
 import at.gv.egiz.pdfas.lib.api.verify.VerifyResult;
+import at.gv.egiz.pdfas.lib.impl.StatusRequestImpl;
 import at.gv.egiz.pdfas.moa.MOAConnector;
 import at.gv.egiz.pdfas.sigs.pades.PAdESSigner;
 import at.gv.egiz.pdfas.sigs.pades.PAdESSignerKeystore;
@@ -50,7 +99,7 @@ import at.gv.egiz.sl.schema.InfoboxReadRequestType;
 import at.gv.egiz.sl.schema.InfoboxReadResponseType;
 import at.gv.egiz.sl.schema.ObjectFactory;
 import at.gv.egiz.sl.util.BKUSLConnector;
-import at.gv.egiz.sl.util.BaseSLConnector;
+import at.gv.egiz.sl.util.ISLConnector;
 import at.gv.egiz.sl.util.RequestPackage;
 import at.gv.egiz.sl.util.SLMarschaller;
 import at.gv.egiz.sl20.SL20Connector;
@@ -60,48 +109,21 @@ import at.gv.egiz.sl20.exceptions.SLCommandoParserException;
 import at.gv.egiz.sl20.utils.SL20Constants;
 import at.gv.egiz.sl20.utils.SL20JSONBuilderUtils;
 import at.gv.egiz.sl20.utils.SL20JSONExtractorUtils;
-import com.google.gson.JsonArray;
-import com.google.gson.JsonElement;
-import com.google.gson.JsonObject;
 import iaik.x509.X509Certificate;
-import org.apache.commons.codec.binary.Base64;
-import org.apache.commons.io.FileUtils;
-import org.apache.commons.io.IOUtils;
-import org.apache.commons.lang3.StringEscapeUtils;
-import org.apache.commons.lang3.StringUtils;
-import org.apache.http.entity.ContentType;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-import javax.imageio.ImageIO;
-import javax.servlet.RequestDispatcher;
-import javax.servlet.ServletContext;
-import javax.servlet.ServletException;
-import javax.servlet.http.HttpServletRequest;
-import javax.servlet.http.HttpServletResponse;
-import javax.servlet.http.HttpSession;
-import javax.xml.bind.JAXBElement;
-import javax.xml.ws.WebServiceException;
-import java.awt.*;
-import java.awt.image.RenderedImage;
-import java.io.*;
-import java.net.URL;
-import java.net.URLEncoder;
-import java.security.cert.CertificateException;
-import java.util.*;
-import java.util.List;
+import lombok.extern.slf4j.Slf4j;
 
+@Slf4j
 public class PdfAsHelper {
 
 	private static final String PDF_CONFIG = "PDF_CONFIG";
+	
+	private static final String PDF_PROCESSING_REQUEST = "PDF_PROCESSING_REQUEST";
 	private static final String PDF_STATUS = "PDF_STATUS";
 	private static final String PDF_OUTPUT = "PDF_OUTPUT";
 	private static final String PDF_SL_CONNECTOR = "PDF_SL_CONNECTOR";
 	private static final String PDF_STATISTICS = "PDF_STATISTICS";
 	private static final String PDF_SIGNER = "PDF_SIGNER";
 	private static final String PDF_SL_INTERACTIVE = "PDF_SL_INTERACTIVE";
-	private static final String PDF_SIGNED_DATA = "PDF_SIGNED_DATA";
-	private static final String PDF_SIGNED_DATA_CREATED = "PDF_SIGNED_DATA_CREATED";
 	private static final String PDF_LOCALE = "PDF_LOCALE";
 	private static final String PDF_ERR_MESSAGE = "PDF_ERR_MESSAGE";
 	private static final String PDF_ERR_THROWABLE = "PDF_ERR_THROWABLE";
@@ -114,9 +136,7 @@ public class PdfAsHelper {
 	private static final String PDF_USERENTRY_PAGE = "/userentry";
 	private static final String PDF_ERR_URL = "PDF_ERR_URL";
 	private static final String PDF_FILE_NAME = "PDF_FILE_NAME";
-	private static final String PDF_SIGNER_CERT = "PDF_SIGNER_CERT";
 	private static final String PDF_VER_LEVEL = "PDF_VER_LEVEL";
-	private static final String PDF_VER_RESP = "PDF_VER_RESP";
 	private static final String PDF_INVOKE_URL = "PDF_INVOKE_URL";
 	private static final String PDF_INVOKE_TARGET = "PDF_INVOKE_TARGET";
 	private static final String PDF_RESPONSE_MODE = "PDF_RESPONSE_MODE";
@@ -124,14 +144,14 @@ public class PdfAsHelper {
 	private static final String SIGNATURE_DATA_HASH = "SIGNATURE_DATA_HASH";
 	private static final String SIGNATURE_ACTIVE = "SIGNATURE_ACTIVE";
 	private static final String VERIFICATION_RESULT = "VERIFICATION_RESULT";
+  private static final String PDF_SIGNING_RESPONSE = "PDF_SIGNING_RESULT";
 	private static final String QRCODE_CONTENT = "QR_CONT";
 	public static final String PDF_SESSION_PREFIX = "PDF_SESSION_";
-
+  
+	public static final String DEFAULT_RESULT_FILENAME = "document.pdf";
 	
-	public enum PDF_RESPONSE_MODES {htmlform, direct};
 	
-	private static final Logger logger = LoggerFactory
-			.getLogger(PdfAsHelper.class);
+	public enum PDF_RESPONSE_MODES {htmlform, direct};
 
 	private static PdfAs pdfAs;
 	private static ObjectFactory of = new ObjectFactory();
@@ -142,15 +162,15 @@ public class PdfAsHelper {
 	}
 
 	public static void init() {
-		logger.info("PDF-AS Helper initialized");
+		log.info("PDF-AS Helper initialized");
 	}
 
 	public static synchronized void reloadConfig() {
-		logger.info("Creating PDF-AS");
+		log.info("Creating PDF-AS");
 		pdfAs = PdfAsFactory.createPdfAs(new File(WebConfiguration
 				.getPdfASDir()));
 		pdfAsConfig = pdfAs.getConfiguration();
-		logger.info("Creating PDF-AS done");
+		log.info("Creating PDF-AS done");
 	}
 
 	public static Configuration getPdfAsConfig() {
@@ -310,11 +330,11 @@ public class PdfAsHelper {
 			try {
 				signIdx = Integer.parseInt(signidxString);
 			} catch (Throwable e) {
-				logger.warn("Failed to parse Signature Index: " + signidxString);
+				log.warn("Failed to parse Signature Index: " + signidxString);
 			}
 		}
 
-		logger.debug("Verifing Signature index: " + signIdx);
+		log.debug("Verifing Signature index: " + signIdx);
 
 		Configuration config = pdfAs.getConfiguration();
 
@@ -335,7 +355,7 @@ public class PdfAsHelper {
 	public static List<VerifyResult> synchronousVerify(byte[] pdfData,
 																										 int signIdx, SignatureVerificationLevel lvl,
 																										 Map<String, String> preProcessor) throws Exception {
-		logger.debug("Verifing Signature index: " + signIdx);
+		log.debug("Verifing Signature index: " + signIdx);
 
 		Configuration config = pdfAs.getConfiguration();
 
@@ -354,198 +374,53 @@ public class PdfAsHelper {
 
 		return results;
 	}
-
-	/**
-	 * Create synchronous PDF Signature
-	 * 
-	 * @param request
-	 *            The Web request
-	 * @param response
-	 *            The Web response
-	 * @param pdfData
-	 *            The pdf data
-	 * @param dynamicSignatureBlockArguments
-	 * @return The signed pdf data
-	 * @throws Exception
-	 */
-	public static byte[] synchronousSignature(HttpServletRequest request,
-																						HttpServletResponse response, byte[] pdfData,
-																						Map<String, String> dynamicSignatureBlockArguments) throws Exception {
-		validatePdfSize(request, response, pdfData);
-
-		Configuration config = pdfAs.getConfiguration();
-
-
-		Map<String,String> configOverwrite = PdfAsParameterExtractor.getOverwriteMap(request);
-		ConfigurationOverwrite.overwriteConfiguration(configOverwrite, config);
-		
-		ByteArrayOutputStream baos = new ByteArrayOutputStream();
-
-		// Generate Sign Parameter
-		SignParameter signParameter = PdfAsFactory.createSignParameter(config,
-				new ByteArrayDataSource(pdfData), baos);
-
-		// Get Connector
-		String connector = PdfAsParameterExtractor.getConnector(request);
-
-		if (!connector.equals("moa") && !connector.equals("jks")) {
-			throw new PdfAsWebException("Invalid connector (moa | jks)");
-		}
-
-		IPlainSigner signer;
-		if (connector.equals("moa")) {
-
-			String keyIdentifier = PdfAsParameterExtractor
-					.getKeyIdentifier(request);
-
-			if (keyIdentifier != null) {
-				if (!WebConfiguration.isMoaEnabled(keyIdentifier)) {
-					throw new PdfAsWebException("MOA connector ["
-							+ keyIdentifier + "] disabled or not existing.");
-				}
-
-				String url = WebConfiguration.getMoaURL(keyIdentifier);
-				String keyId = WebConfiguration.getMoaKeyID(keyIdentifier);
-				String certificate = WebConfiguration
-						.getMoaCertificate(keyIdentifier);
-
-				config.setValue(IConfigurationConstants.MOA_SIGN_URL, url);
-				config.setValue(IConfigurationConstants.MOA_SIGN_KEY_ID, keyId);
-				config.setValue(IConfigurationConstants.MOA_SIGN_CERTIFICATE,
-						certificate);
-			} else {
-				if (!WebConfiguration.getMOASSEnabled()) {
-					throw new PdfAsWebException("MOA connector disabled.");
-				}
-			}
-
-			signer = new PAdESSigner(new MOAConnector(config));
-		} else if (connector.equals("jks")) {
-
-			String keyIdentifier = PdfAsParameterExtractor
-					.getKeyIdentifier(request);
-
-			boolean ksEnabled = false;
-			String ksFile = null;
-			String ksAlias = null;
-			String ksPass = null;
-			String ksKeyPass = null;
-			String ksType = null;
-
-			if (keyIdentifier != null) {
-				ksEnabled = WebConfiguration.getKeystoreEnabled(keyIdentifier);
-				ksFile = WebConfiguration.getKeystoreFile(keyIdentifier);
-				ksAlias = WebConfiguration.getKeystoreAlias(keyIdentifier);
-				ksPass = WebConfiguration.getKeystorePass(keyIdentifier);
-				ksKeyPass = WebConfiguration.getKeystoreKeyPass(keyIdentifier);
-				ksType = WebConfiguration.getKeystoreType(keyIdentifier);
-			} else {
-				ksEnabled = WebConfiguration.getKeystoreDefaultEnabled();
-				ksFile = WebConfiguration.getKeystoreDefaultFile();
-				ksAlias = WebConfiguration.getKeystoreDefaultAlias();
-				ksPass = WebConfiguration.getKeystoreDefaultPass();
-				ksKeyPass = WebConfiguration.getKeystoreDefaultKeyPass();
-				ksType = WebConfiguration.getKeystoreDefaultType();
-			}
-
-			if (!ksEnabled) {
-				if (keyIdentifier != null) {
-					throw new PdfAsWebException("JKS connector ["
-							+ keyIdentifier + "] disabled or not existing.");
-				} else {
-					throw new PdfAsWebException(
-							"DEFAULT JKS connector disabled.");
-				}
-			}
-
-			if (ksFile == null || ksAlias == null || ksPass == null
-					|| ksKeyPass == null || ksType == null) {
-				if (keyIdentifier != null) {
-					throw new PdfAsWebException("JKS connector ["
-							+ keyIdentifier + "] not correctly configured.");
-				} else {
-					throw new PdfAsWebException(
-							"DEFAULT JKS connector not correctly configured.");
-				}
-			}
-
-			signer = new PAdESSignerKeystore(ksFile, ksAlias, ksPass,
-					ksKeyPass, ksType);
-		} else {
-			throw new PdfAsWebException("Invalid connector (moa | jks)");
-		}
-
-		signParameter.setPlainSigner(signer);
-
-		String profileId = PdfAsParameterExtractor.getSigType(request);
-		String qrCodeContent = PdfAsHelper.getQRCodeContent(request);
-
-		if (qrCodeContent != null) {
-			if (profileId == null) {
-				// get default Profile
-				profileId = config.getValue("sig_obj.type.default");
-			}
-
-			if (profileId == null) {
-				logger.warn("Failed to determine default profile! Using hard coded!");
-				profileId = "SIGNATURBLOCK_SMALL_DE";
-			}
-
-			ByteArrayOutputStream qrbaos = new ByteArrayOutputStream();
-			try {
-				String key = "sig_obj." + profileId + ".value.SIG_LABEL";
-				QRCodeGenerator.generateQRCode(qrCodeContent, qrbaos, 200);
-				String value = Base64.encodeBase64String(qrbaos.toByteArray());
-				config.setValue(key, value);
-			} finally {
-				IOUtils.closeQuietly(qrbaos);
-			}
-		}
-
-		// set Signature Profile (null use default ...)
-		signParameter.setSignatureProfileId(profileId);
-
-		// set Signature Position
-		signParameter.setSignaturePosition(buildPosString(request, response));
-
-		//set signature block parameters
-		signParameter.setDynamicSignatureBlockArguments(dynamicSignatureBlockArguments);
-		@SuppressWarnings("unused")
-		SignResult result = pdfAs.sign(signParameter);
-
-		return baos.toByteArray();
-	}
-
-	/**
-	 * Create synchronous PDF Signature
-	 * 
-	 * @param params
-	 *            The Web request
-	 * @param pdfData
-	 *            The pdf data
-	 * @return The signed pdf data
-	 * @throws Exception
-	 */
-	public static PDFASSignResponse synchronousServerSignature(byte[] pdfData,
-																														 PDFASSignParameters params, Map<String, String> dynamicSignatureBlockArguments) throws Exception {
-
+	
+  public static PdfasSignResponse synchronousServerSignature(PdfasSignRequest internalReq) throws Exception {
+    log.debug("Find #{} files to sign synchronized. Starting signing process ... ", internalReq.getInput().size());    
+    PdfasSignResponseBuilder respBuilder = PdfasSignResponse.builder();            
+    respBuilder.requestId(internalReq.getRequestID());
+    respBuilder.transactionId(internalReq.getCoreParams().getTransactionId());
+    
+    // sign each document
+    Iterator<DocumentToSign> docsToSign = internalReq.getInput().iterator();
+    while(docsToSign.hasNext()) {
+      respBuilder.signedPdf(synchronousServerSignature(docsToSign.next(), internalReq.getCoreParams()));
+      
+    }
+       
+    log.debug("Signing process finished.");
+    return respBuilder.build();
+    
+  }
+
+  /**
+   * Create synchronous signed PDF's
+   * 
+   * @param documentToSign Document to sign with parameters
+   * @param coreParams generic signing parameters
+   * @return Signing result
+   * @throws Exception In case of an error
+   */
+	private static SignedDocument synchronousServerSignature(DocumentToSign documentToSign, CoreSignParams coreParams) throws Exception {
+	  log.debug("Signing file with transactionId:{}", coreParams.getTransactionId());
+	  
 		Configuration config = pdfAs.getConfiguration();
 
-		if (WebConfiguration.isAllowExtOverwrite() && params.getOverrides() != null) {
-			ConfigurationOverwrite.overwriteConfiguration(params.getOverrides().getMap(), config);
+		if (WebConfiguration.isAllowExtOverwrite() && coreParams.getOverrides() != null) {
+			ConfigurationOverwrite.overwriteConfiguration(coreParams.getOverrides(), config);
 		}
 
 		ByteArrayOutputStream baos = new ByteArrayOutputStream();
 
 		// Generate Sign Parameter
 		SignParameter signParameter = PdfAsFactory.createSignParameter(config,
-				new ByteArrayDataSource(pdfData), baos);
+				new ByteArrayDataSource(documentToSign.getInputData()), baos);
 
 		// Get Connector
 
 		IPlainSigner signer;
-		if (params.getConnector().equals(Connector.MOA)) {
-			String keyIdentifier = params.getKeyIdentifier();
+		if (coreParams.getConnector().equals(Connector.MOA)) {
+			String keyIdentifier = coreParams.getKeyIdentifier();
 
 			if (keyIdentifier != null) {
 				if (!WebConfiguration.isMoaEnabled(keyIdentifier)) {
@@ -569,8 +444,10 @@ public class PdfAsHelper {
 			}
 
 			signer = new PAdESSigner(new MOAConnector(config));
-		} else if (params.getConnector().equals(Connector.JKS)) {
-			String keyIdentifier = params.getKeyIdentifier();
+		
+		
+		} else if (coreParams.getConnector().equals(Connector.JKS)) {
+			String keyIdentifier = coreParams.getKeyIdentifier();
 
 			boolean ksEnabled = false;
 			String ksFile = null;
@@ -618,17 +495,19 @@ public class PdfAsHelper {
 
 			signer = new PAdESSignerKeystore(ksFile, ksAlias, ksPass,
 					ksKeyPass, ksType);
+			
 		} else {
 			throw new PdfAsWebException("Invalid connector (moa | jks)");
+			
 		}
 
 		signParameter.setPlainSigner(signer);
 
-		String profile = params.getProfile();
+		String profile = documentToSign.getProfile();
 
 		// PdfAsHelper.getQRCodeContent(request);
 		// Get QR Code Content form param
-		String qrCodeContent = params.getQRCodeContent();
+		String qrCodeContent = documentToSign.getQrCodeContent();
 
 		if (qrCodeContent != null) {
 			if (profile == null) {
@@ -637,7 +516,7 @@ public class PdfAsHelper {
 			}
 
 			if (profile == null) {
-				logger.warn("Failed to determine default profile! Using hard coded!");
+				log.warn("Failed to determine default profile! Using hard coded!");
 				profile = "SIGNATURBLOCK_SMALL_DE";
 			}
 
@@ -656,220 +535,157 @@ public class PdfAsHelper {
 		signParameter.setSignatureProfileId(profile);
 
 		// set Signature Position
-		signParameter.setSignaturePosition(params.getPosition());
+		signParameter.setSignaturePosition(documentToSign.getPosition());
 
 		// Set Preprocessor
-		if (params.getPreprocessor() != null) {
-			signParameter.setPreprocessorArguments(params.getPreprocessor()
-					.getMap());
-		}
-		//TODO alex
-		signParameter.setDynamicSignatureBlockArguments(dynamicSignatureBlockArguments);
-
-		SignResult signResult = pdfAs.sign(signParameter);
-
-		PDFASSignResponse signResponse = new PDFASSignResponse();
-		signResponse.setSignedPDF(baos.toByteArray());
-
-		PDFASVerificationResponse verResponse = new PDFASVerificationResponse();
-
-		verResponse.setSignerCertificate(signResult.getSignerCertificate()
-				.getEncoded());
-
-		signResponse.setVerificationResponse(verResponse);
-
-		return signResponse;
-	}
-
-	public static void startSignatureJson(HttpServletRequest request,
-									  HttpServletResponse response, ServletContext context,
-									  byte[] pdfData, String connector, String position,
-									  String transactionId, String profile,
-									  Map<String, String> preProcessor, Map<String, String> overwrite) throws Exception {
-
-		// TODO: Protect session so that only one PDF can be signed during one
-		// session
-		/*
-		 * if(PdfAsHelper.isSignatureActive(request)) { throw new
-		 * PdfAsException("Signature is active in this session"); }
-		 *
-		 * PdfAsHelper.setSignatureActive(request, true);
-		 */
-
-		validatePdfSize(request, response, pdfData);
-
-		HttpSession session = request.getSession();
-
-		logger.info("Starting signature in session: " + session.getId());
-
-		Configuration config = pdfAs.getConfiguration();
-		session.setAttribute(PDF_CONFIG, config);
-
-		ConfigurationOverwrite.overwriteConfiguration(overwrite, config);
-
-		ByteArrayOutputStream baos = new ByteArrayOutputStream();
-		session.setAttribute(PDF_OUTPUT, baos);
-
-		// Generate Sign Parameter
-		SignParameter signParameter = PdfAsFactory.createSignParameter(config,
-				new ByteArrayDataSource(pdfData), baos);
-
-		logger.info("Setting TransactionID: " + transactionId);
-
-		signParameter.setTransactionId(transactionId);
-
-		IPlainSigner signer;
-		if (connector.equals("bku") || connector.equals("onlinebku")
-				|| connector.equals("mobilebku")) {
-			BKUSLConnector conn = new BKUSLConnector(config);
-			// conn.setBase64(true);
-			signer = new PAdESSigner(conn);
-			session.setAttribute(PDF_SL_CONNECTOR, conn);
-			
-		} else if (connector.equals("sl20")) {
-			SL20Connector conn = new SL20Connector(config);
-			signer = new PAdESSigner(conn);
-			session.setAttribute(PDF_SL_CONNECTOR, conn);
+		if (coreParams.getPreprocessor() != null) {
+			signParameter.setPreprocessorArguments(coreParams.getPreprocessor());
 			
-		} else {
-			throw new PdfAsWebException(
-					"Invalid connector (bku | onlinebku | mobilebku | moa | jks)");
-		}
-		signParameter.setPreprocessorArguments(preProcessor);
-		signParameter.setPlainSigner(signer);
-		session.setAttribute(PDF_SIGNER, signer);
-		session.setAttribute(PDF_SL_INTERACTIVE, connector);
-
-		String qrCodeContent = PdfAsHelper.getQRCodeContent(request);
-
-		if (qrCodeContent != null) {
-			if (profile == null) {
-				// get default Profile
-				profile = config.getValue("sig_obj.type.default");
-			}
-
-			if (profile == null) {
-				logger.warn("Failed to determine default profile! Using hard coded!");
-				profile = "SIGNATURBLOCK_SMALL_DE";
-			}
-
-			ByteArrayOutputStream qrbaos = new ByteArrayOutputStream();
-			try {
-				String key = "sig_obj." + profile + ".value.SIG_LABEL";
-				QRCodeGenerator.generateQRCode(qrCodeContent, qrbaos, 200);
-				String value = Base64.encodeBase64String(qrbaos.toByteArray());
-				config.setValue(key, value);
-			} finally {
-				IOUtils.closeQuietly(qrbaos);
-			}
 		}
 
-		// set Signature Profile (null use default ...)
-		signParameter.setSignatureProfileId(profile);
+		signParameter.setDynamicSignatureBlockArguments(coreParams.getSignatureBlockParameters());
 
-		// set Signature Position
-		signParameter.setSignaturePosition(position);
-
-		StatusRequest statusRequest = pdfAs.startSign(signParameter);
-		session.setAttribute(PDF_STATUS, statusRequest);
-	}
-
-	public static void startSignature(HttpServletRequest request,
-			HttpServletResponse response, ServletContext context,
-			byte[] pdfData, String connector, String position,
-			String transactionId, String profile,
-			Map<String, String> preProcessor, Map<String, String> overwrite, Map<String, String> dynamicSignatureBlockArguments) throws Exception {
-
-		// TODO: Protect session so that only one PDF can be signed during one
-		// session
-		/*
-		 * if(PdfAsHelper.isSignatureActive(request)) { throw new
-		 * PdfAsException("Signature is active in this session"); }
-		 * 
-		 * PdfAsHelper.setSignatureActive(request, true);
-		 */
-
-		validatePdfSize(request, response, pdfData);
-
-		HttpSession session = request.getSession();
-
-		logger.info("Starting signature in session: " + session.getId());
-
-		Configuration config = pdfAs.getConfiguration();
-		session.setAttribute(PDF_CONFIG, config);
+		SignResult signResult = pdfAs.sign(signParameter);
 
-		ConfigurationOverwrite.overwriteConfiguration(overwrite, config);
 		
-		ByteArrayOutputStream baos = new ByteArrayOutputStream();
-		session.setAttribute(PDF_OUTPUT, baos);
-
-		// Generate Sign Parameter
-		SignParameter signParameter = PdfAsFactory.createSignParameter(config,
-				new ByteArrayDataSource(pdfData), baos);
-
-		logger.info("Setting TransactionID: " + transactionId);
+    PDFASVerificationResponse verResponse = new PDFASVerificationResponse();
+    verResponse.setSignerCertificate(signResult.getSignerCertificate()
+        .getEncoded());
 
-		signParameter.setTransactionId(transactionId);
-
-		IPlainSigner signer;
-		if (connector.equals("bku") || connector.equals("onlinebku")
-				|| connector.equals("mobilebku")) {
-			BKUSLConnector conn = new BKUSLConnector(config);
-			// conn.setBase64(true);
-			signer = new PAdESSigner(conn);
-			session.setAttribute(PDF_SL_CONNECTOR, conn);
-
-		} else if (connector.equals("sl20")) {
-			SL20Connector conn = new SL20Connector(config);
-			signer = new PAdESSigner(conn);
-			session.setAttribute(PDF_SL_CONNECTOR, conn);
-			
-		} else {
-			throw new PdfAsWebException(
-					"Invalid connector (bku | onlinebku | mobilebku | moa | jks | sl20)");
-		}
-		signParameter.setPreprocessorArguments(preProcessor);
-		signParameter.setPlainSigner(signer);
-		session.setAttribute(PDF_SIGNER, signer);
-		session.setAttribute(PDF_SL_INTERACTIVE, connector);
-
-		String qrCodeContent = PdfAsHelper.getQRCodeContent(request);
-
-		if (qrCodeContent != null) {
-			if (profile == null) {
-				// get default Profile
-				profile = config.getValue("sig_obj.type.default");
-			}
-
-			if (profile == null) {
-				logger.warn("Failed to determine default profile! Using hard coded!");
-				profile = "SIGNATURBLOCK_SMALL_DE";
-			}
-
-			ByteArrayOutputStream qrbaos = new ByteArrayOutputStream();
-			try {
-				String key = "sig_obj." + profile + ".value.SIG_LABEL";
-				QRCodeGenerator.generateQRCode(qrCodeContent, qrbaos, 200);
-				String value = Base64.encodeBase64String(qrbaos.toByteArray());
-				config.setValue(key, value);
-			} finally {
-				IOUtils.closeQuietly(qrbaos);
-			}
-		}
-
-		// set Signature Profile (null use default ...)
-		signParameter.setSignatureProfileId(profile);
-
-		// set Signature Position
-		signParameter.setSignaturePosition(position);
-
-		signParameter.setDynamicSignatureBlockArguments(dynamicSignatureBlockArguments);
-		StatusRequest statusRequest = pdfAs.startSign(signParameter);
-		session.setAttribute(PDF_STATUS, statusRequest);
-
-		PdfAsHelper.process(request, response, context);
+		
+    SignedDocument signPdfDoc = SignedDocument.builder()
+        .signingTimestamp(Long.valueOf(System.currentTimeMillis()))
+        .outputData(baos.toByteArray())
+        .fileName(documentToSign.getFileName())
+        .verificationResponse(verResponse)
+        .signerCertificate(Base64.encodeBase64String(signResult.getSignerCertificate().getEncoded()))
+        .build(); 
+
+		return signPdfDoc;
+		
 	}
 
+	public static void startSignatureJson(HttpServletRequest request, HttpServletResponse response, 
+	    ServletContext context, String connector, PdfasSignRequest pdfAsRequest) throws Exception {
+	  HttpSession session = request.getSession();
+        
+    log.info("Starting signature in session: " + session.getId());    
+    session.setAttribute(PDF_PROCESSING_REQUEST, pdfAsRequest);    
+    
+    StatusRequest statusRequest = initializeSigningContextForNewDocument(request, connector, pdfAsRequest);    
+    session.setAttribute(PDF_STATUS, statusRequest);
+    
+	}
+
+  public static void startSignature(HttpServletRequest request, HttpServletResponse response,
+      ServletContext context, String connector, PdfasSignRequest pdfAsRequest) throws Exception {    
+    HttpSession session = request.getSession();
+    log.info("Starting signature in session: " + session.getId());    
+    session.setAttribute(PDF_PROCESSING_REQUEST, pdfAsRequest);    
+    
+    StatusRequest statusRequest = initializeSigningContextForNewDocument(request, connector, pdfAsRequest);    
+    session.setAttribute(PDF_STATUS, statusRequest);
+    
+    // start processing of first document
+    PdfAsHelper.process(request, response, context);
+            
+  }
+	
+  private static StatusRequest initializeSigningContextForNewDocument(HttpServletRequest request, String connector, PdfasSignRequest pdfAsRequest) 
+      throws PdfAsWebException, WriterException, IOException, PdfAsException, PDFASError {   
+    HttpSession session = request.getSession();
+    
+    Configuration config = pdfAs.getConfiguration();
+    session.setAttribute(PDF_CONFIG, config);
+
+    ConfigurationOverwrite.overwriteConfiguration(pdfAsRequest.getCoreParams().getOverrides(), config);
+        
+    session.setAttribute(PDF_SL_INTERACTIVE, connector);
+        
+    // prepare first document
+    IPlainSigner signer = getSignerFromConnector(connector, config, session);
+    session.setAttribute(PDF_SIGNER, signer);
+        
+    String qrCodeContent = PdfAsHelper.getQRCodeContent(request);
+    
+    DocumentToSign documentToSign = pdfAsRequest.next();
+    PdfAsHelper.setPDFFileName(request, documentToSign.getFileName());
+    
+    return buildPdfasStatusRequestToSignSingleDocument(documentToSign,
+        session, signer, pdfAsRequest.getCoreParams(), qrCodeContent, config);                    
+        
+  }
+
+  private static StatusRequest buildPdfasStatusRequestToSignSingleDocument(DocumentToSign pdfToSign, HttpSession session, IPlainSigner signer, 
+      CoreSignParams coreSignParams, String qrCodeContent, Configuration config) throws WriterException, IOException, PdfAsException, PDFASError {
+    ByteArrayOutputStream baos = new ByteArrayOutputStream();
+    session.setAttribute(PDF_OUTPUT, baos);
+        
+    // Generate Sign Parameter
+    SignParameter signParameter = PdfAsFactory.createSignParameter(config, new ByteArrayDataSource(pdfToSign.getInputData()), baos);
+    log.info("Setting TransactionID: " + coreSignParams.getTransactionId());
+    signParameter.setTransactionId(coreSignParams.getTransactionId());
+
+    signParameter.setPlainSigner(signer);
+    
+   
+    signParameter.setPreprocessorArguments(coreSignParams.getPreprocessor());
+
+    
+    String profile = pdfToSign.getProfile();
+    if (qrCodeContent != null) {
+      if (profile == null) {
+        // get default Profile
+        profile = config.getValue("sig_obj.type.default");
+      }
+
+      if (profile == null) {
+        log.warn("Failed to determine default profile! Using hard coded!");
+        profile = "SIGNATURBLOCK_SMALL_DE";
+      }
+
+      ByteArrayOutputStream qrbaos = new ByteArrayOutputStream();
+      try {
+        String key = "sig_obj." + profile + ".value.SIG_LABEL";
+        QRCodeGenerator.generateQRCode(qrCodeContent, qrbaos, 200);
+        String value = Base64.encodeBase64String(qrbaos.toByteArray());
+        config.setValue(key, value);
+      } finally {
+        IOUtils.closeQuietly(qrbaos);
+      }
+    }
+
+    // set Signature Profile (null use default ...)
+    signParameter.setSignatureProfileId(profile);
+
+    // set Signature Position
+    signParameter.setSignaturePosition(pdfToSign.getPosition());
+
+    signParameter.setDynamicSignatureBlockArguments(coreSignParams.getSignatureBlockParameters());
+        
+    return pdfAs.startSign(signParameter);
+    
+  }
+
+  private static IPlainSigner getSignerFromConnector(String connector, Configuration config, HttpSession session) throws PdfAsWebException {
+    if (connector.equals("bku") || connector.equals("onlinebku")
+        || connector.equals("mobilebku")) {
+      BKUSLConnector conn = new BKUSLConnector(config);
+      session.setAttribute(PDF_SL_CONNECTOR, conn);
+      return new PAdESSigner(conn);
+      
+
+    } else if (connector.equals("sl20")) {
+      SL20Connector conn = new SL20Connector(config);
+      session.setAttribute(PDF_SL_CONNECTOR, conn);
+      return new PAdESSigner(conn);
+            
+    } else {
+      throw new PdfAsWebException(
+          "Invalid connector (bku | onlinebku | mobilebku | moa | jks | sl20)");
+    }    
+  }
+	
 	public static byte[] getCertificate(
 			InfoboxReadResponseType infoboxReadResponseType) {
 		byte[] data = null;
@@ -953,7 +769,7 @@ public class PdfAsHelper {
 			byte[] cmsSginature,
 			ServletContext context) throws Exception {
 
-		logger.debug("Got CMS Signature Response");
+		log.debug("Got CMS Signature Response");
 
 		HttpSession session = request.getSession();
 		StatusRequest statusRequest = (StatusRequest) session
@@ -973,7 +789,7 @@ public class PdfAsHelper {
 
 	public static void logAccess(HttpServletRequest request) {
 		HttpSession session = request.getSession();
-		logger.info("Access to " + request.getServletPath() + " in Session: "
+		log.info("Access to " + request.getServletPath() + " in Session: "
 				+ session.getId());
 	}
 
@@ -994,7 +810,7 @@ public class PdfAsHelper {
 					.getAttribute(PDF_SL_CONNECTOR);
 
 			if (statusRequest.needCertificate()) {
-				logger.debug("Needing Certificate from BKU");
+				log.debug("Needing Certificate from BKU");
 				// build SL Request to read certificate
 				InfoboxReadRequestType readCertificateRequest = bkuSLConnector
 						.createInfoboxReadRequest(statusRequest
@@ -1014,42 +830,32 @@ public class PdfAsHelper {
 		return null;
 	}
 
-	public static void process(HttpServletRequest request,
+	protected static void process(HttpServletRequest request,
 			HttpServletResponse response, ServletContext context)
 			throws Exception {
 
 		HttpSession session = request.getSession();
-		StatusRequest statusRequest = (StatusRequest) session
-				.getAttribute(PDF_STATUS);
+		StatusRequest statusRequest = (StatusRequest) session.getAttribute(PDF_STATUS);
+		PdfasSignRequest pdfAsRequest = (PdfasSignRequest) session.getAttribute(PDF_PROCESSING_REQUEST);
+		
+		
 		// IPlainSigner plainSigner = (IPlainSigner) session
 		// .getAttribute(PDF_SIGNER);
 
 		String connector = (String) session.getAttribute(PDF_SL_INTERACTIVE);
 
 		//load connector
-		BaseSLConnector slConnector = null;
-		if (connector.equals("bku") || connector.equals("onlinebku")
-				|| connector.equals("mobilebku"))
-			slConnector = (BKUSLConnector) session
-					.getAttribute(PDF_SL_CONNECTOR);
-		
-		else if (connector.equals("sl20"))
-			slConnector = (SL20Connector) session
-					.getAttribute(PDF_SL_CONNECTOR);
-		
-		else
-			throw new PdfAsWebException("Invalid connector: " + connector);
+		ISLConnector slConnector = (ISLConnector) session.getAttribute(PDF_SL_CONNECTOR);
 		
 		JsonSecurityUtils joseTools = JsonSecurityUtils.getInstance();
 		if (!joseTools.isInitialized())
 			joseTools = null;
 		
 		if (statusRequest.needCertificate()) {
-			logger.debug("Needing Certificate from BKU");
+			log.debug("Needing Certificate from BKU");
 			// build SL Request to read certificate
 			InfoboxReadRequestType readCertificateRequest = slConnector
-					.createInfoboxReadRequest(statusRequest
-							.getSignParameter());
+					.createInfoboxReadRequest(statusRequest.getSignParameter());
 
 			if (slConnector instanceof BKUSLConnector) {
 				JAXBElement<InfoboxReadRequestType> readRequest = of
@@ -1114,7 +920,7 @@ public class PdfAsHelper {
 				//send SL20 request via Backend connection
 				JsonObject sl20Resp = sl20Connector.sendSL20Request(sl20Req, null, generateBKUURL(connector));
 				if (sl20Resp == null) {
-					logger.info("Receive NO responce from SL2.0 connection. Process stops ... ");
+					log.info("Receive NO responce from SL2.0 connection. Process stops ... ");
 					throw new SLCommandoParserException();
 					
 				}
@@ -1124,12 +930,12 @@ public class PdfAsHelper {
 						sl20Resp, joseTools, false);
 				
 				if (respPayloadContainer.isValidSigned() == null)
-					logger.debug("Receive unsigned payLoad from VDA");
+					log.debug("Receive unsigned payLoad from VDA");
 					
 				JsonObject respPayload = respPayloadContainer.getPayload();
 				if (respPayload.get(SL20Constants.SL20_COMMAND_CONTAINER_NAME).getAsString()
 						.equals(SL20Constants.SL20_COMMAND_IDENTIFIER_REDIRECT)) {
-					logger.debug("Find 'redirect' command in VDA response ... ");									
+					log.debug("Find 'redirect' command in VDA response ... ");									
 					JsonObject params = SL20JSONExtractorUtils.getJSONObjectValue(respPayload, SL20Constants.SL20_COMMAND_CONTAINER_PARAMS, true);					
 					String redirectURL = SL20JSONExtractorUtils.getStringValue(params, SL20Constants.SL20_COMMAND_PARAM_GENERAL_REDIRECT_URL, true);									
 					JsonObject command = SL20JSONExtractorUtils.getJSONObjectValue(params, SL20Constants.SL20_COMMAND_PARAM_GENERAL_REDIRECT_COMMAND, false);
@@ -1156,11 +962,11 @@ public class PdfAsHelper {
 					String errorCode = SL20JSONExtractorUtils.getStringValue(result, SL20Constants.SL20_COMMAND_PARAM_GENERAL_RESPONSE_ERRORCODE, true);
 					String errorMsg = SL20JSONExtractorUtils.getStringValue(result, SL20Constants.SL20_COMMAND_PARAM_GENERAL_RESPONSE_ERRORMESSAGE, true);
 					
-					logger.info("Receive SL2.0 error. Code:" + errorCode + " Msg:" + errorMsg);
+					log.info("Receive SL2.0 error. Code:" + errorCode + " Msg:" + errorMsg);
 					throw new SL20Exception("sl20.08");
 					
 				} else {
-					logger.warn("Received an unrecognized command: " + respPayload.get(SL20Constants.SL20_COMMAND_CONTAINER_NAME).getAsString());
+					log.warn("Received an unrecognized command: " + respPayload.get(SL20Constants.SL20_COMMAND_CONTAINER_NAME).getAsString());
 					throw new SLCommandoParserException();
 					
 				}
@@ -1169,7 +975,7 @@ public class PdfAsHelper {
 				throw new PdfAsWebException("Invalid connector: " + slConnector.getClass().getName());
 			
 		} else if (statusRequest.needSignature()) {
-			logger.debug("Needing Signature from BKU");
+			log.debug("Needing Signature from BKU");
 			// build SL Request for cms signature
 			RequestPackage pack = slConnector.createCMSRequest(
 					statusRequest.getSignatureData(),
@@ -1182,7 +988,7 @@ public class PdfAsHelper {
 								.createCreateCMSSignatureRequest(pack
 										.getRequestType()));
 
-				logger.trace("SL Request: " + slRequest);
+				log.trace("SL Request: " + slRequest);
 				
 				response.setContentType("text/xml");
 				response.getWriter().write(slRequest);
@@ -1192,11 +998,11 @@ public class PdfAsHelper {
 				//convert byte range
 				
 				int[] exclude_range = PDFUtils.buildExcludeRange(statusRequest.getSignatureDataByteRange());
-				logger.info("Exclude Byte Range: " + exclude_range[0] + " " + exclude_range[1]);
+				log.info("Exclude Byte Range: " + exclude_range[0] + " " + exclude_range[1]);
 				
 				List<JsonElement> byteRanges = new ArrayList<JsonElement>();
 				if (statusRequest.getSignatureDataByteRange().length % 2 != 0) {
-					logger.warn("ByteRange is not a set of pairs. Something is maybe suspect");
+					log.warn("ByteRange is not a set of pairs. Something is maybe suspect");
 					
 				}
 				
@@ -1266,7 +1072,7 @@ public class PdfAsHelper {
 				request.getSession(false).setAttribute(PDF_SESSION_PREFIX + SL20Constants.SL20_REQID, reqId);
 
 				//forward SL2.0 command
-				logger.trace("Write 'createCAdES' command to VDA: " + sl20CreateCAdES.toString());
+				log.trace("Write 'createCAdES' command to VDA: " + sl20CreateCAdES.toString());
 				StringWriter writer = new StringWriter();
 				writer.write(sl20CreateCAdES.toString());						
 				final byte[] content = writer.toString().getBytes("UTF-8");
@@ -1275,19 +1081,16 @@ public class PdfAsHelper {
 				response.setContentType(ContentType.APPLICATION_JSON.toString());						
 				response.getOutputStream().write(content);
 				
-			} else
+			} else {
 				throw new PdfAsWebException("Invalid connector: " + slConnector.getClass().getName());
 				
-				
-
+			}
+								
 		} else if (statusRequest.isReady()) {
-			// TODO: store pdf document redirect to Finish URL
-			logger.debug("Document ready!");
-
+			log.debug("Single document is ready. Perform post-processing ... ");
 			SignResult result = pdfAs.finishSign(statusRequest);
 
-			ByteArrayOutputStream baos = (ByteArrayOutputStream) session
-					.getAttribute(PDF_OUTPUT);
+			ByteArrayOutputStream baos = (ByteArrayOutputStream) session.getAttribute(PDF_OUTPUT);
 			baos.close();
 
 			PDFASVerificationResponse verResponse = new PDFASVerificationResponse();
@@ -1305,35 +1108,55 @@ public class PdfAsHelper {
 					.getCertificateCheck().getCode());
 			verResponse.setValueCode(verifyResult.getValueCheckCode()
 					.getCode());
-
-			PdfAsHelper.setPDFASVerificationResponse(request, verResponse);
-			PdfAsHelper.setSignedPdf(request, response, baos.toByteArray());
-
-			String signerCert = Base64.encodeBase64String(result
-					.getSignerCertificate().getEncoded());
-
-			PdfAsHelper.setSignerCertificate(request, signerCert);
+					
+			SignedDocument signPdfDoc = SignedDocument.builder()
+			    .signingTimestamp(Long.valueOf(System.currentTimeMillis()))
+			    .outputData(baos.toByteArray())
+			    .fileName(PdfAsHelper.getPDFFileName(request))
+			    .verificationResponse(verResponse)
+			    .signerCertificate(Base64.encodeBase64String(result.getSignerCertificate().getEncoded()))
+			    .build();			
+						
+			addSignedDocumentToResult(request, signPdfDoc, pdfAsRequest.getRequestID(), 
+			    pdfAsRequest.getCoreParams().getTransactionId());
 			
-			if (slConnector instanceof BKUSLConnector) {
-				PdfAsHelper.gotoProvidePdf(context, request, response);
-				
-			} else if (slConnector instanceof SL20Connector) {
-				//TODO: add code to send SL20 redirect command to redirect the user from DataURL connection to App Front-End connection
-				String callUrl = generateProvideURL(request, response);
-				String transactionId = (String) request.getAttribute(PdfAsHelper.PDF_SESSION_PREFIX + SL20Constants.SL20_TRANSACTIONID);
-				buildSL20RedirectResponse(request, response, transactionId, callUrl);
-				
-			} else
-				throw new PdfAsWebException("Invalid connector: " + slConnector.getClass().getName());
+			// check if more files are available
+			if (pdfAsRequest.hasNext()) {
+			  log.debug("Find additional file, restarting signing process again ... ");			  
+			  StatusRequestImpl nextStatusRequest = (StatusRequestImpl)initializeSigningContextForNewDocument(request, connector, pdfAsRequest);			  
+			  nextStatusRequest.setCertificate(((StatusRequestImpl)statusRequest).getCertificate().getEncoded());
+			  nextStatusRequest.setNeedCertificate(true);
+		    
+			  statusRequest = pdfAs.process(nextStatusRequest);
+			  session.setAttribute(PDF_STATUS, nextStatusRequest);
+
+			  PdfAsHelper.process(request, response, context);			  			 
+			  session.setAttribute(PDF_STATUS, nextStatusRequest);
+			  		    			  			  
+			} else {
+	      if (slConnector instanceof BKUSLConnector) {
+	        PdfAsHelper.gotoProvidePdf(context, request, response);
+	        
+	      } else if (slConnector instanceof SL20Connector) {
+	        //TODO: add code to send SL20 redirect command to redirect the user from DataURL connection to App Front-End connection
+	        String callUrl = generateProvideURL(request, response);
+	        String transactionId = (String) request.getAttribute(PdfAsHelper.PDF_SESSION_PREFIX + SL20Constants.SL20_TRANSACTIONID);
+	        buildSL20RedirectResponse(request, response, transactionId, callUrl);
+	        
+	      } else
+	        throw new PdfAsWebException("Invalid connector: " + slConnector.getClass().getName());
+	     			  
+			}
 			
-		} else {
-			throw new PdfAsWebException("Invalid state!");
-		}
+    } else {
+      throw new PdfAsWebException("Invalid state!");
+      
+    }
 	}
 
-	private static String getTemplateSL() throws IOException {
-		String xml = FileUtils.readFileToString(FileUtils
-				.toFile(PdfAsHelper.class.getResource("/template_sl.html")));
+  private static String getTemplateSL() throws IOException {
+		String xml = FileUtils.readFileToString(
+		    FileUtils.toFile(PdfAsHelper.class.getResource("/template_sl.html")));
 		return xml;
 	}
 
@@ -1371,52 +1194,13 @@ public class PdfAsHelper {
 		return xml;
 	}
 
-	public static boolean isSignedDataExpired(HttpServletRequest request,
-											  HttpServletResponse response) {
-		HttpSession session = request.getSession();
-		Object signedData = session.getAttribute(PDF_SIGNED_DATA_CREATED);
-		if (signedData == null) {
-			logger.warn("Cannot find signed data created timestamp in session.");
-			return true;
-		}
-
-		if (signedData instanceof Long) {
-			long created = ((Long)signedData).longValue();
-			long now = System.currentTimeMillis();
-
-			long validUntil = created + 300000;
-
-			logger.debug("Checking signed data valid until {} now is {}",
-					validUntil, now);
-
-			return validUntil < now;
-		}
-		logger.warn("PDF_SIGNED_DATA_CREATED in session is not a long type!");
-		return true;
-	}
-
-	public static byte[] getSignedPdf(HttpServletRequest request,
-			HttpServletResponse response) {
-		HttpSession session = request.getSession();
-		Object signedData = session.getAttribute(PDF_SIGNED_DATA);
-		if (signedData == null) {
-			return null;
-		}
-
-		if (signedData instanceof byte[]) {
-			return (byte[]) signedData;
-		}
-		logger.warn("PDF_SIGNED_DATA in session is not a byte[] type!");
-		return null;
-	}
-
-	public static void setSignedPdf(HttpServletRequest request,
-			HttpServletResponse response, byte[] signedData) {
-		HttpSession session = request.getSession();
-		session.setAttribute(PDF_SIGNED_DATA, signedData);
-		session.setAttribute(PDF_SIGNED_DATA_CREATED, Long.valueOf(System.currentTimeMillis()));
-	}
-
+  public static String getInvokeRedirectTemplateMoreFiles() throws IOException {
+    String xml = FileUtils.readFileToString(FileUtils
+        .toFile(PdfAsHelper.class
+            .getResource("/template_invoke_redirect_more_files.html")));
+    return xml;
+  }
+	
 	public static void setStatisticEvent(HttpServletRequest request,
 			HttpServletResponse response, StatisticEvent event) {
 		HttpSession session = request.getSession();
@@ -1467,7 +1251,7 @@ public class PdfAsHelper {
 		if (obj instanceof Throwable) {
 			return (Throwable) obj;
 		}
-		logger.warn("PDF_ERR_THROWABLE in session is not a throwable type!");
+		log.warn("PDF_ERR_THROWABLE in session is not a throwable type!");
 		return null;
 	}
 
@@ -1498,7 +1282,7 @@ public class PdfAsHelper {
 	public static void setErrorURL(HttpServletRequest request,
 			HttpServletResponse response, String url) {
 		HttpSession session = request.getSession();
-		logger.debug("[" + session.getId() + "]: Setting Error URL to: " + url);
+		log.debug("[" + session.getId() + "]: Setting Error URL to: " + url);
 		session.setAttribute(PDF_ERR_URL, url);
 	}
 
@@ -1512,7 +1296,7 @@ public class PdfAsHelper {
 	public static void setInvokeURL(HttpServletRequest request,
 			HttpServletResponse response, String url) {
 		HttpSession session = request.getSession();
-		logger.debug("[" + session.getId() + "]: Setting Invoke URL to: " + url);
+		log.debug("[" + session.getId() + "]: Setting Invoke URL to: " + url);
 		session.setAttribute(PDF_INVOKE_URL, url);
 	}
 
@@ -1528,7 +1312,7 @@ public class PdfAsHelper {
 
 		HttpSession session = request.getSession();
 		session.setAttribute(PDF_INVOKE_TARGET, url);
-		logger.debug("External Invoke TARGET: " + url);
+		log.debug("External Invoke TARGET: " + url);
 	}
 
 	public static String getInvokeTarget(HttpServletRequest request,
@@ -1547,7 +1331,7 @@ public class PdfAsHelper {
 				mode = PDF_RESPONSE_MODES.valueOf(responseMode);
 				
 			} catch (Exception e) {
-				logger.warn("HTTP parameter 'responsemode' has an unsupported value: " + responseMode 
+				log.warn("HTTP parameter 'responsemode' has an unsupported value: " + responseMode 
 						+ ". Use default value: " + mode.toString());
 				
 			}
@@ -1555,7 +1339,7 @@ public class PdfAsHelper {
 				
 		HttpSession session = request.getSession();				
 		session.setAttribute(PDF_RESPONSE_MODE , mode);
-		logger.debug("External ResponseMode: " + mode.toString());
+		log.debug("External ResponseMode: " + mode.toString());
 		
 	}
 	
@@ -1565,11 +1349,11 @@ public class PdfAsHelper {
 		Object obj = session.getAttribute(PDF_RESPONSE_MODE);
 		
 		if (obj == null) {
-			logger.debug("'responseMode' parameter is 'null'. Use defaultvalue: " + PDF_RESPONSE_MODES.htmlform.toString());
+			log.debug("'responseMode' parameter is 'null'. Use defaultvalue: " + PDF_RESPONSE_MODES.htmlform.toString());
 			return PDF_RESPONSE_MODES.htmlform;
 			
 		} else {
-			logger.debug("'responseMode' parameter is " + ((PDF_RESPONSE_MODES) obj).toString());
+			log.debug("'responseMode' parameter is " + ((PDF_RESPONSE_MODES) obj).toString());
 			return (PDF_RESPONSE_MODES) obj;
 		}
 				
@@ -1596,7 +1380,7 @@ public class PdfAsHelper {
 						+ session.getId();
 			}
 		}
-		logger.debug("Generated URL: " + dataURL);
+		log.debug("Generated URL: " + dataURL);
 		return dataURL;
 	}
 
@@ -1639,7 +1423,7 @@ public class PdfAsHelper {
 	public static String generateUserEntryURL(String storeId) {
 		String publicURL = WebConfiguration.getPublicURL();
 		if (publicURL == null) {
-			logger.error("To use this functionality "
+			log.error("To use this functionality "
 					+ WebConfiguration.PUBLIC_URL
 					+ " has to be configured in the web configuration");
 			return null;
@@ -1650,7 +1434,7 @@ public class PdfAsHelper {
 			return baseURL + "?" + UIEntryPointServlet.REQUEST_ID_PARAM + "="
 					+ URLEncoder.encode(storeId, "UTF-8");
 		} catch (UnsupportedEncodingException e) {
-			logger.warn("Encoding not supported for URL encoding", e);
+			log.warn("Encoding not supported for URL encoding", e);
 		}
 		return baseURL + "?" + UIEntryPointServlet.REQUEST_ID_PARAM + "="
 				+ storeId;
@@ -1723,24 +1507,45 @@ public class PdfAsHelper {
 		if (obj != null) {
 			return obj.toString();
 		}
-		return "document.pdf";
+		return DEFAULT_RESULT_FILENAME;
+	}
+
+	public static void addSignedDocumentToResult(HttpServletRequest request, SignedDocument signPdfDoc, 
+	    String requestId, String transactionId) {
+	  PdfasSignResponse fullResponse = getPdfSigningResponse(request);
+	  
+	  if (fullResponse == null) {	    
+	    setPdfSigningResponse(request,
+	        PdfasSignResponse.builder()
+	        .requestId(requestId)
+	        .transactionId(transactionId)
+	        .signedPdf(signPdfDoc).build());
+	    
+	  } else {
+	    setPdfSigningResponse(request,
+	        fullResponse.toBuilder().signedPdf(signPdfDoc).build());
+	    
+	  }	   	
 	}
-
-	public static void setSignerCertificate(HttpServletRequest request,
-			String value) {
-		HttpSession session = request.getSession();
-		session.setAttribute(PDF_SIGNER_CERT, value);
+	
+	public static void setPdfSigningResponse(HttpServletRequest request, PdfasSignResponse response) {
+	  HttpSession session = request.getSession();
+	  session.setAttribute(PDF_SIGNING_RESPONSE, response);
+	      
 	}
-
-	public static String getSignerCertificate(HttpServletRequest request) {
-		HttpSession session = request.getSession();
-		Object obj = session.getAttribute(PDF_SIGNER_CERT);
-		if (obj != null) {
-			return obj.toString();
-		}
-		return null;
+	
+	public static PdfasSignResponse getPdfSigningResponse(HttpServletRequest request) {
+	  HttpSession session = request.getSession();
+	  Object obj = session.getAttribute(PDF_SIGNING_RESPONSE);
+    if (obj != null && obj instanceof PdfasSignResponse) {
+      return (PdfasSignResponse) obj;
+      
+    }
+	  
+	  return null;
+	  	 
 	}
-
+	
 	public static void setVerificationLevel(HttpServletRequest request,
 			SignatureVerificationLevel lvl) {
 		HttpSession session = request.getSession();
@@ -1757,22 +1562,6 @@ public class PdfAsHelper {
 		return SignatureVerificationLevel.INTEGRITY_ONLY_VERIFICATION;
 	}
 
-	public static void setPDFASVerificationResponse(HttpServletRequest request,
-			PDFASVerificationResponse resp) {
-		HttpSession session = request.getSession();
-		session.setAttribute(PDF_VER_RESP, resp);
-	}
-
-	public static PDFASVerificationResponse getPDFASVerificationResponse(
-			HttpServletRequest request) {
-		HttpSession session = request.getSession();
-		Object obj = session.getAttribute(PDF_VER_RESP);
-		if (obj != null && obj instanceof PDFASVerificationResponse) {
-			return (PDFASVerificationResponse) obj;
-		}
-		return null;
-	}
-
 	public static void setVerificationResult(HttpServletRequest request,
 			List<VerifyResult> value) {
 		HttpSession session = request.getSession();
@@ -1787,12 +1576,12 @@ public class PdfAsHelper {
 		if (obj != null) {
 			try {
 				if (!(obj instanceof List<?>)) {
-					logger.warn("Invalid object type");
+					log.warn("Invalid object type");
 					return null;
 				}
 				return (List<VerifyResult>) obj;
 			} catch (Throwable e) {
-				logger.warn("Invalid object type");
+				log.warn("Invalid object type");
 			}
 		}
 		return null;
@@ -1861,14 +1650,14 @@ public class PdfAsHelper {
 				redirectTwoCommand, 
 				null); 
 		
-		logger.trace("SL2.0 command: " + respContainer.toString());
+		log.trace("SL2.0 command: " + respContainer.toString());
 		
 		//workaround for A-Trust
 		if (request.getHeader(SL20Constants.HTTP_HEADER_SL20_CLIENT_TYPE) != null && 
 				request.getHeader(SL20Constants.HTTP_HEADER_SL20_CLIENT_TYPE).equals(SL20Constants.HTTP_HEADER_VALUE_NATIVE)
 					|| true) {					
-			logger.debug("Client request containts 'native client' header ... ");
-			logger.trace("SL20 response to VDA: " + respContainer);
+			log.debug("Client request containts 'native client' header ... ");
+			log.trace("SL20 response to VDA: " + respContainer);
 			StringWriter writer = new StringWriter();
 			writer.write(respContainer.toString());						
 			final byte[] content = writer.toString().getBytes("UTF-8");
@@ -1879,11 +1668,10 @@ public class PdfAsHelper {
 			
 			
 		} else {
-			logger.info("SL2.0 DataURL communication needs http header: '" + SL20Constants.HTTP_HEADER_SL20_CLIENT_TYPE + "'");
+			log.info("SL2.0 DataURL communication needs http header: '" + SL20Constants.HTTP_HEADER_SL20_CLIENT_TYPE + "'");
 			throw new SL20Exception("sl20.06");
 			
 		}
 	}
 
-
 }
diff --git a/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/servlets/ExternSignServlet.java b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/servlets/ExternSignServlet.java
index 674d3351..898e44e2 100644
--- a/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/servlets/ExternSignServlet.java
+++ b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/servlets/ExternSignServlet.java
@@ -23,6 +23,25 @@
  ******************************************************************************/
 package at.gv.egiz.pdfas.web.servlets;
 
+import java.io.File;
+import java.io.IOException;
+import java.util.List;
+import java.util.Map;
+
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import org.apache.commons.fileupload.FileItem;
+import org.apache.commons.fileupload.disk.DiskFileItemFactory;
+import org.apache.commons.fileupload.servlet.ServletFileUpload;
+
+import at.gv.egiz.pdfas.api.processing.CoreSignParams;
+import at.gv.egiz.pdfas.api.processing.DocumentToSign;
+import at.gv.egiz.pdfas.api.processing.PdfasSignRequest;
+import at.gv.egiz.pdfas.api.processing.PdfasSignResponse;
+import at.gv.egiz.pdfas.api.ws.PDFASSignParameters.Connector;
 import at.gv.egiz.pdfas.common.exceptions.PDFASError;
 import at.gv.egiz.pdfas.common.exceptions.PdfAsException;
 import at.gv.egiz.pdfas.common.exceptions.PdfAsSettingsValidationException;
@@ -43,24 +62,12 @@ import at.gv.egiz.pdfas.web.stats.StatisticEvent.Operation;
 import at.gv.egiz.pdfas.web.stats.StatisticEvent.Source;
 import at.gv.egiz.pdfas.web.stats.StatisticEvent.Status;
 import at.gv.egiz.pdfas.web.stats.StatisticFrontend;
-import org.apache.commons.fileupload.FileItem;
-import org.apache.commons.fileupload.disk.DiskFileItemFactory;
-import org.apache.commons.fileupload.servlet.ServletFileUpload;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-import javax.servlet.ServletException;
-import javax.servlet.http.HttpServlet;
-import javax.servlet.http.HttpServletRequest;
-import javax.servlet.http.HttpServletResponse;
-import java.io.File;
-import java.io.IOException;
-import java.util.List;
-import java.util.Map;
+import lombok.extern.slf4j.Slf4j;
 
 /**
  * Servlet implementation class Sign
  */
+@Slf4j
 public class ExternSignServlet extends HttpServlet {
 
 	private static final long serialVersionUID = 1L;
@@ -69,9 +76,6 @@ public class ExternSignServlet extends HttpServlet {
 	
 	private static final String UPLOAD_PDF_DATA = "pdf-file";
 	private static final String UPLOAD_DIRECTORY = "upload";
-
-	private static final Logger logger = LoggerFactory
-			.getLogger(ExternSignServlet.class);
 	
 	/**
 	 * Default constructor.
@@ -81,7 +85,7 @@ public class ExternSignServlet extends HttpServlet {
 		String webconfig = System.getProperty(PDF_AS_WEB_CONF);
 		
 		if(webconfig == null) {
-			logger.error("No web configuration provided! Please specify: " + PDF_AS_WEB_CONF);
+			log.error("No web configuration provided! Please specify: " + PDF_AS_WEB_CONF);
 			throw new RuntimeException("No web configuration provided! Please specify: " + PDF_AS_WEB_CONF);
 		}
 		
@@ -92,7 +96,7 @@ public class ExternSignServlet extends HttpServlet {
 			PdfAsFactory.validateConfiguration((ISettings)PdfAsHelper.getPdfAsConfig());
 		} catch (PdfAsSettingsValidationException e) {
 			// TODO Auto-generated catch block
-			logger.error(e.getLocalizedMessage(),e.getCause());
+			log.error(e.getLocalizedMessage(),e.getCause());
 			//e.printStackTrace();
 		}
 	}
@@ -100,9 +104,10 @@ public class ExternSignServlet extends HttpServlet {
 	protected void doGet(HttpServletRequest request,
 			HttpServletResponse response) throws ServletException, IOException {
 		
-		//PdfAsHelper.regenerateSession(request);
+    // invalidate existing http sessions at first
+    request.getSession().invalidate();
 		
-		logger.debug("Get signing request");
+		log.debug("Get signing request");
 		
 		String errorUrl = PdfAsParameterExtractor.getInvokeErrorURL(request);
 		PdfAsHelper.setErrorURL(request, response, errorUrl);
@@ -131,7 +136,7 @@ public class ExternSignServlet extends HttpServlet {
 			byte[] pdfData = RemotePDFFetcher.fetchPdfFile(pdfUrl);
 			doSignature(request, response, pdfData, statisticEvent);
 		} catch (Exception e) {
-			logger.error("Signature failed", e);
+			log.error("Signature failed", e);
 			statisticEvent.setStatus(Status.ERROR);
 			statisticEvent.setException(e);
 			if(e instanceof PDFASError) {
@@ -154,10 +159,11 @@ public class ExternSignServlet extends HttpServlet {
 	 */
 	protected void doPost(HttpServletRequest request,
 			HttpServletResponse response) throws ServletException, IOException {
-		
-		//PdfAsHelper.regenerateSession(request);
-		
-		logger.debug("Post signing request");
+
+    // invalidate existing http sessions at first
+    request.getSession().invalidate();
+	  		
+		log.debug("Post signing request");
 		
 		String errorUrl = PdfAsParameterExtractor.getInvokeErrorURL(request);
 		PdfAsHelper.setErrorURL(request, response, errorUrl);
@@ -202,7 +208,7 @@ public class ExternSignServlet extends HttpServlet {
 				}
 
 				List<?> formItems = upload.parseRequest(request);
-				logger.debug(formItems.size() + " Items in form data");
+				log.debug(formItems.size() + " Items in form data");
 				if (formItems.size() < 1) {
 					// No Uploaded data!
 					// Try do get
@@ -224,30 +230,30 @@ public class ExternSignServlet extends HttpServlet {
 								try {
 									File f = new File(item.getName());
 									String name = f.getName();
-									logger.debug("Got upload: " + item.getName());
+									log.debug("Got upload: " + item.getName());
 									if(name != null) {
 										if(!(name.endsWith(".pdf") || name.endsWith(".PDF"))) {
 											name += ".pdf";
 										}
 										
-										logger.debug("Setting Filename in session: " + name);
+										log.debug("Setting Filename in session: " + name);
 										PdfAsHelper.setPDFFileName(request, name);
 									}
 								}
 								catch(Throwable e) {
-									logger.warn("In resolving filename", e);
+									log.warn("In resolving filename", e);
 								}
 								if(filecontent.length < 10) {
 									filecontent = null;
 								} else {
-									logger.debug("Found pdf Data! Size: " + filecontent.length);
+									log.debug("Found pdf Data! Size: " + filecontent.length);
 								}
 							} else {
 								request.setAttribute(item.getFieldName(), item.getString());
-								logger.debug("Setting " + item.getFieldName() + " = " + item.getString());
+								log.debug("Setting " + item.getFieldName() + " = " + item.getString());
 							}
 						} else {
-							logger.debug(obj.getClass().getName() +  " - " + obj.toString());
+							log.debug(obj.getClass().getName() +  " - " + obj.toString());
 						}
 					}
 				}
@@ -282,7 +288,7 @@ public class ExternSignServlet extends HttpServlet {
 			
 			doSignature(request, response, filecontent, statisticEvent);
 		} catch (Exception e) {
-			logger.error("Signature failed", e);
+			log.error("Signature failed", e);
 			statisticEvent.setStatus(Status.ERROR);
 			statisticEvent.setException(e);
 			if(e instanceof PDFASError) {
@@ -351,24 +357,48 @@ public class ExternSignServlet extends HttpServlet {
 			}
 
 		} catch(Exception e) {
-			logger.error(e.getLocalizedMessage());
+			log.error(e.getLocalizedMessage());
 		}
 
 		String filename = PdfAsParameterExtractor.getFilename(request);
 		if(filename != null) {
-			logger.debug("Setting Filename in session: " + filename);
+			log.debug("Setting Filename in session: " + filename);
 			PdfAsHelper.setPDFFileName(request, filename);
 		}
 		
 		String pdfDataHash = DigestHelper.getHexEncodedHash(pdfData);
 		
 		PdfAsHelper.setSignatureDataHash(request, pdfDataHash);
-		logger.debug("Storing signatures data hash: " + pdfDataHash);
+		log.debug("Storing signatures data hash: " + pdfDataHash);
 
 		Map<String, String> dynamicSignatureBlockArguments =
 				PdfAsParameterExtractor.getDynamicSignatureBlockParameters(request);
 
-		logger.debug("Starting signature creation with: " + connector);
+		log.debug("Starting signature creation with: " + connector);
+		
+    // prepare internal process data-structure
+    PdfasSignRequest data = new PdfasSignRequest();
+              
+    CoreSignParams coreParams = new CoreSignParams();                   
+    coreParams.setSignatureBlockParameters(dynamicSignatureBlockArguments);    
+    coreParams.setConnector(Connector.fromString(connector));
+    coreParams.setKeyIdentifier(PdfAsParameterExtractor.getKeyIdentifier(request));
+    coreParams.setOverrides(PdfAsParameterExtractor.getOverwriteMap(request));        
+    coreParams.setPreprocessor(PdfAsParameterExtractor.getPreProcessorMap(request));
+    coreParams.setInvokeErrorUrl(errorUrl);
+    coreParams.setInvokeTarget(invokeTarget);
+    coreParams.setInvokeUrl(invokeUrl);
+    coreParams.setTransactionId(transactionId);
+    data.setCoreParams(coreParams);
+
+    DocumentToSign document = new DocumentToSign();
+    document.setInputData(pdfData);
+    document.setPosition(PdfAsHelper.buildPosString(request, response));
+    document.setProfile(PdfAsParameterExtractor.getSigType(request));
+    document.setQrCodeContent(qrcodeContent);
+    document.setFileName(PdfAsHelper.getPDFFileName(request)); 
+    data.addDocumentToSign(document);
+		
 		
 		//IPlainSigner signer;
 		if (connector.equals("bku") || connector.equals("onlinebku") || connector.equals("mobilebku")
@@ -397,13 +427,12 @@ public class ExternSignServlet extends HttpServlet {
 			}
 
 			PdfAsHelper.setStatisticEvent(request, response, statisticEvent);
+			
+	    // sign document
+			PdfAsHelper.startSignature(request, response, getServletContext(), connector, data);
 
-
-			PdfAsHelper.startSignature(request, response, getServletContext(), pdfData, connector,
-					PdfAsHelper.buildPosString(request, response), transactionId, PdfAsParameterExtractor
-					.getSigType(request), PdfAsParameterExtractor.getPreProcessorMap(request), 
-					PdfAsParameterExtractor.getOverwriteMap(request), dynamicSignatureBlockArguments);
 			return;
+			
 		} else if (connector.equals("jks") || connector.equals("moa")) {
 			// start synchronous siganture creation
 			
@@ -434,10 +463,13 @@ public class ExternSignServlet extends HttpServlet {
 				}
 			}
 
-			byte[] pdfSignedData = PdfAsHelper.synchronousSignature(request,
-					response, pdfData, dynamicSignatureBlockArguments);
-			PdfAsHelper.setSignedPdf(request, response, pdfSignedData);
+			// sign document
+			PdfasSignResponse pdfSignedData = PdfAsHelper.synchronousServerSignature(data);
 			
+			// inject response
+			PdfAsHelper.setPdfSigningResponse(request, pdfSignedData);					
+					
+			// set statistic entry
 			statisticEvent.setStatus(Status.OK);
 			statisticEvent.setEndNow();
 			statisticEvent.setTimestampNow();
@@ -446,8 +478,10 @@ public class ExternSignServlet extends HttpServlet {
 			
 			PdfAsHelper.gotoProvidePdf(getServletContext(), request, response);
 			return;
+			
 		} else {
 			throw new PdfAsWebException("Invalid connector (bku | moa | jks)");
+			
 		}
 	}
 }
diff --git a/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/servlets/JSONAPIServlet.java b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/servlets/JSONAPIServlet.java
index 641c09e7..d5ef2079 100644
--- a/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/servlets/JSONAPIServlet.java
+++ b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/servlets/JSONAPIServlet.java
@@ -1,7 +1,28 @@
 package at.gv.egiz.pdfas.web.servlets;
 
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import org.apache.commons.codec.binary.Base64;
+import org.apache.commons.io.IOUtils;
+import org.json.JSONArray;
+import org.json.JSONObject;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import at.gv.egiz.pdfas.api.processing.CoreSignParams;
+import at.gv.egiz.pdfas.api.processing.DocumentToSign;
+import at.gv.egiz.pdfas.api.processing.PdfasSignRequest;
+import at.gv.egiz.pdfas.api.processing.PdfasSignResponse;
 import at.gv.egiz.pdfas.api.ws.PDFASSignParameters;
-import at.gv.egiz.pdfas.api.ws.PDFASSignResponse;
+import at.gv.egiz.pdfas.api.ws.PDFASSignParameters.Connector;
 import at.gv.egiz.pdfas.common.exceptions.PDFASError;
 import at.gv.egiz.pdfas.lib.api.verify.VerifyParameter;
 import at.gv.egiz.pdfas.lib.api.verify.VerifyResult;
@@ -13,27 +34,13 @@ import at.gv.egiz.pdfas.web.helper.JSONStartResponse;
 import at.gv.egiz.pdfas.web.helper.PdfAsHelper;
 import at.gv.egiz.pdfas.web.stats.StatisticEvent;
 import at.gv.egiz.pdfas.web.stats.StatisticFrontend;
-import org.apache.commons.codec.binary.Base64;
-import org.apache.commons.io.IOUtils;
-import org.json.JSONArray;
-import org.json.JSONObject;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-import javax.servlet.ServletException;
-import javax.servlet.http.HttpServlet;
-import javax.servlet.http.HttpServletRequest;
-import javax.servlet.http.HttpServletResponse;
-import java.io.IOException;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
 
 /**
  * Created by Andreas Fitzek on 6/23/16.
  */
 public class JSONAPIServlet extends HttpServlet {
 
+  private static final long serialVersionUID = -2319338922500393376L;
     private static final String JSON_PROFILE = "profile";
     private static final String JSON_POSITION = "position";
     private static final String JSON_CONNECTOR = "connector";
@@ -151,17 +158,39 @@ public class JSONAPIServlet extends HttpServlet {
             }catch(Exception e){
                 e.printStackTrace();
             }
+            
+            
+            PdfasSignRequest data = new PdfasSignRequest();
+            
+            data.setRequestID(requestID);
+            
+            CoreSignParams coreParams = new CoreSignParams();                   
+            coreParams.setSignatureBlockParameters(signatureBlockParametersMap);    
+            coreParams.setConnector(Connector.fromString(connector));
+            data.setCoreParams(coreParams);
+
+            DocumentToSign document = new DocumentToSign();
+            document.setInputData(inputDocument);
+            document.setPosition(position);
+            document.setProfile(profile);    
+            data.addDocumentToSign(document);
+            
+            
+            
             if (PDFASSignParameters.Connector.MOA.equals(connectorEnum)
                     || PDFASSignParameters.Connector.JKS.equals(connectorEnum)) {
                 // Plain server based signatures!!
-                PDFASSignResponse pdfasSignResponse = PdfAsHelper.synchronousServerSignature(
-                        inputDocument, parameters, signatureBlockParametersMap);
-
+              
+                                                                  
+                //TODO: update implementation to support more than one file!!!!
+                
+                PdfasSignResponse pdfasSignResponse = PdfAsHelper.synchronousServerSignature(data);
+                                
                 VerifyResult verifyResult = null;
 
                 List<VerifyResult> verResults = PdfAsHelper
                            .synchronousVerify(
-                                    pdfasSignResponse.getSignedPDF(),
+                                    pdfasSignResponse.getSignedPdfs().get(0).getOutputData(),
                                     -1,
                                     VerifyParameter.SignatureVerificationLevel.INTEGRITY_ONLY_VERIFICATION,
                                     null);
@@ -187,7 +216,7 @@ public class JSONAPIServlet extends HttpServlet {
                     statisticEvent.setLogged(true);
                 }
 
-                jsonResponse.put(JSON_OUTPUT, Base64.encodeBase64String(pdfasSignResponse.getSignedPDF()));
+                jsonResponse.put(JSON_OUTPUT, Base64.encodeBase64String(pdfasSignResponse.getSignedPdfs().get(0).getOutputData()));
                 jsonResponse.put(JSON_OUTPUT_SIG, verifyResult.getValueCheckCode().getCode());
                 jsonResponse.put(JSON_OUTPUT_CER, verifyResult.getCertificateCheck().getCode());
 
@@ -234,13 +263,8 @@ public class JSONAPIServlet extends HttpServlet {
                         }
                     }
 
-
                     PdfAsHelper.startSignatureJson(request, response, getServletContext(),
-                            inputDocument, connectorEnum.toString(),
-                            position,
-                            null,
-                            profile, null,
-                            null);
+                        connectorEnum.toString(), data);
 
                 JSONStartResponse jsonStartResponse = PdfAsHelper.startJsonProcess(request, response, getServletContext());
 
diff --git a/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/servlets/PDFData.java b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/servlets/PDFData.java
index 401d3e68..bf45745d 100644
--- a/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/servlets/PDFData.java
+++ b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/servlets/PDFData.java
@@ -3,19 +3,19 @@
  * PDF-AS has been contracted by the E-Government Innovation Center EGIZ, a
  * joint initiative of the Federal Chancellery Austria and Graz University of
  * Technology.
- * 
+ *
  * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
  * the European Commission - subsequent versions of the EUPL (the "Licence");
  * You may not use this work except in compliance with the Licence.
  * You may obtain a copy of the Licence at:
  * http://www.osor.eu/eupl/
- * 
+ *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the Licence is distributed on an "AS IS" basis,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the Licence for the specific language governing permissions and
  * limitations under the Licence.
- * 
+ *
  * This product combines work with different licenses. See the "NOTICE" text
  * file for details on the various modules and licenses.
  * The "NOTICE" text file is part of the distribution. Any derivative works
@@ -23,147 +23,262 @@
  ******************************************************************************/
 package at.gv.egiz.pdfas.web.servlets;
 
-import java.io.*;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+import java.util.Iterator;
+import java.util.List;
+import java.util.zip.Deflater;
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipOutputStream;
 
 import javax.servlet.ServletException;
 import javax.servlet.http.HttpServlet;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 
-import at.gv.egiz.pdfas.web.config.WebConfiguration;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
+import at.gv.egiz.pdfas.api.processing.SignedDocument;
 import at.gv.egiz.pdfas.api.ws.PDFASVerificationResponse;
+import at.gv.egiz.pdfas.web.config.WebConfiguration;
 import at.gv.egiz.pdfas.web.helper.PdfAsHelper;
 import at.gv.egiz.pdfas.web.helper.PdfAsParameterExtractor;
 import at.gv.egiz.pdfas.web.stats.StatisticEvent;
 import at.gv.egiz.pdfas.web.stats.StatisticEvent.Status;
 import at.gv.egiz.pdfas.web.stats.StatisticFrontend;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-import javax.servlet.ServletException;
-import javax.servlet.http.HttpServlet;
-import javax.servlet.http.HttpServletRequest;
-import javax.servlet.http.HttpServletResponse;
-import java.io.IOException;
-import java.io.OutputStream;
+import lombok.extern.slf4j.Slf4j;
 
 /**
  * Servlet implementation class PDFData
  */
+@Slf4j
 public class PDFData extends HttpServlet {
 
-	private static final long serialVersionUID = 1L;
-
-	private static final Logger logger = LoggerFactory.getLogger(PDFData.class);
-
-	/**
-	 * @see HttpServlet#HttpServlet()
-	 */
-	public PDFData() {
-		super();
-	}
-
-	/**
-	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse
-	 *      response)
-	 */
-	protected void doGet(HttpServletRequest request,
-			HttpServletResponse response) throws ServletException, IOException {
-		this.process(request, response);
-	}
-
-	/**
-	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
-	 *      response)
-	 */
-	protected void doPost(HttpServletRequest request,
-			HttpServletResponse response) throws ServletException, IOException {
-		this.process(request, response);
-	}
-
-	protected void process(HttpServletRequest request,
-			HttpServletResponse response) throws ServletException, IOException {
-		byte[] signedData = PdfAsHelper.getSignedPdf(request, response);
-
-		StatisticEvent statisticEvent = PdfAsHelper.getStatisticEvent(request,
-				response);
-
-		String plainPDFDigest = PdfAsParameterExtractor.getOrigDigest(request);
-
-		if (signedData != null) {
-
-			if(WebConfiguration.isKeepSignedDocument()) {
-				if(PdfAsHelper.isSignedDataExpired(request, response)) {
-					logger.info("Destroying expired signed data in session");
-					request.getSession().invalidate();
-					PdfAsHelper.setSessionException(request, response,
-							"No signed pdf document available.", null);
-					PdfAsHelper.gotoError(getServletContext(), request, response);
-					return;
-				}
-			}
-
-			if (plainPDFDigest != null) {
-				String signatureDataHash = PdfAsHelper
-						.getSignatureDataHash(request);
-				if (!plainPDFDigest.equalsIgnoreCase(signatureDataHash)) {
-					logger.warn("Digest Hash mismatch!");
-					logger.warn("Requested digest: " + plainPDFDigest);
-					logger.warn("Saved     digest: " + signatureDataHash);
-
-					PdfAsHelper.setSessionException(request, response,
-							"Signature Data digest do not match!", null);
-					PdfAsHelper.gotoError(getServletContext(), request,
-							response);
-					return;
-				}
-			}
-			response.setHeader("Content-Disposition", "inline;filename="
-					+ PdfAsHelper.getPDFFileName(request));
-			String pdfCert = PdfAsHelper.getSignerCertificate(request);
-			if (pdfCert != null) {
-				response.setHeader("Signer-Certificate", pdfCert);
-			}
-
-			if (statisticEvent != null) {
-				if (!statisticEvent.isLogged()) {
-					statisticEvent.setStatus(Status.OK);
-
-					statisticEvent.setEndNow();
-					statisticEvent.setTimestampNow();
-					StatisticFrontend.getInstance().storeEvent(statisticEvent);
-					statisticEvent.setLogged(true);
-				}
-			}
-
-			PDFASVerificationResponse resp = PdfAsHelper
-					.getPDFASVerificationResponse(request);
-			if (resp != null) {
-				response.setHeader("CertificateCheckCode",
-						String.valueOf(resp.getCertificateCode()));
-				response.setHeader("ValueCheckCode",
-						String.valueOf(resp.getValueCode()));
-			}
-			response.setContentType("application/pdf");
-			OutputStream os = response.getOutputStream();
-			os.write(signedData);
-			os.close();
-
-			// When data is collected destroy session!
-			if(!WebConfiguration.isKeepSignedDocument()) {
-				logger.debug("Destroying signed data in session : {}", request.getSession().getId());
-				request.getSession().invalidate();
-			} else {
-				logger.debug("Keeping signed data in session : {}", request.getSession().getId());
-			}
-		} else {
-			logger.info("No signed pdf document available.");
-			PdfAsHelper.setSessionException(request, response,
-					"No signed pdf document available.", null);
-			PdfAsHelper.gotoError(getServletContext(), request, response);
-		}
-	}
+  private static final long serialVersionUID = 1L;
+
+  /**
+   * @see HttpServlet#HttpServlet()
+   */
+  public PDFData() {
+    super();
+  }
+
+  /**
+   * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse
+   *      response)
+   */
+  @Override
+  protected void doGet(HttpServletRequest request,
+      HttpServletResponse response) throws ServletException, IOException {
+    this.process(request, response);
+  }
+
+  /**
+   * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
+   *      response)
+   */
+  @Override
+  protected void doPost(HttpServletRequest request,
+      HttpServletResponse response) throws ServletException, IOException {
+    this.process(request, response);
+  }
+
+  protected void process(HttpServletRequest request,
+      HttpServletResponse response) throws ServletException, IOException {
+
+    if (PdfAsHelper.getPdfSigningResponse(request).getSignedPdfs().isEmpty()) {
+      log.info("No signed pdf document available.");
+      PdfAsHelper.setSessionException(request, response,
+          "No signed pdf document available.", null);
+      PdfAsHelper.gotoError(getServletContext(), request, response);     
+      
+    } else if (PdfAsHelper.getPdfSigningResponse(request).getSignedPdfs().size() == 1)  {
+      buildSingleFileResult(request, response,
+          PdfAsHelper.getPdfSigningResponse(request).getSignedPdfs().get(0));
+            
+    } else {
+      buildMultipleFileResult(request, response, PdfAsHelper.getPdfSigningResponse(request).getSignedPdfs());
+      
+    }
+       
+  }
+
+  private void buildMultipleFileResult(HttpServletRequest request, HttpServletResponse response,
+      List<SignedDocument> signedPdfs) throws IOException, ServletException {
+    
+    final StatisticEvent statisticEvent = PdfAsHelper.getStatisticEvent(request,response);
+
+    // check if some files are expired
+    if (WebConfiguration.isKeepSignedDocument()) {            
+      if (signedPdfs.stream()
+              .filter(el -> isSignedDataExpired(el))
+              .findFirst().isPresent()) {
+        log.info("Destroying expired signed data in session");
+        request.getSession().invalidate();
+        PdfAsHelper.setSessionException(request, response,
+            "No signed pdf document available.", null);
+        PdfAsHelper.gotoError(getServletContext(), request, response);
+        return;
+      }
+    }
+    
+    // package files into ZIP
+    byte[] zippedFiles = packageSignedPdfsIntoZip(signedPdfs);
+        
+    // write static log
+    if (statisticEvent != null) {
+      if (!statisticEvent.isLogged()) {
+        statisticEvent.setStatus(Status.OK);
+        statisticEvent.setEndNow();
+        statisticEvent.setTimestampNow();
+        StatisticFrontend.getInstance().storeEvent(statisticEvent);
+        statisticEvent.setLogged(true);
+      }
+    }
+    
+    // build response
+    response.setHeader("Content-Disposition", "inline;filename=multiple_documents.zip");        
+    response.setContentType("application/zip");
+    final OutputStream os = response.getOutputStream();
+
+    os.write(zippedFiles);
+    os.close();
+
+    // When data is collected destroy session!
+    if (!WebConfiguration.isKeepSignedDocument()) {
+      log.debug("Destroying signed data in session : {}", request.getSession().getId());
+      request.getSession().invalidate();
+    } else {
+      log.debug("Keeping signed data in session : {}", request.getSession().getId());
+    }
+    
+  }
+
+  private byte[] packageSignedPdfsIntoZip(List<SignedDocument> signedPdfs) throws IOException {    
+    ByteArrayOutputStream baOut = new ByteArrayOutputStream();
+    
+    try {    
+      ZipOutputStream zos = new ZipOutputStream(baOut);
+      zos.setLevel(Deflater.BEST_COMPRESSION);
+      zos.setMethod(Deflater.DEFLATED);
+      
+      Iterator<SignedDocument> it = signedPdfs.iterator();
+      while (it.hasNext()) {         
+        SignedDocument entry = it.next();
+         if (entry.getOutputData() != null) {                                 
+            log.debug("Compressing file {}.", entry.getFileName());
+            ZipEntry oze = new ZipEntry(entry.getFileName());
+            zos.putNextEntry(oze);          
+            zos.write(entry.getOutputData());
+            zos.closeEntry();            
+            
+         } else {
+            log.warn("Ignore entry with name: {} because it's empty", entry.getFileName());
+            
+         }
+      }     
+      zos.closeEntry();  
+      zos.finish();
+      zos.close();
+      
+      return baOut.toByteArray();
+    
+    } finally {
+      baOut.close();
+      
+    }
+    
+  }
+
+  private void buildSingleFileResult(HttpServletRequest request, HttpServletResponse response, SignedDocument signedFile) throws ServletException, IOException {
+    final byte[] signedData = signedFile.getOutputData();
+
+    final StatisticEvent statisticEvent = PdfAsHelper.getStatisticEvent(request,
+        response);
+
+    final String plainPDFDigest = PdfAsParameterExtractor.getOrigDigest(request);
+
+    if (signedData != null) {
+
+      if (WebConfiguration.isKeepSignedDocument()) {
+        if (isSignedDataExpired(signedFile)) {
+          log.info("Destroying expired signed data in session");
+          request.getSession().invalidate();
+          PdfAsHelper.setSessionException(request, response,
+              "No signed pdf document available.", null);
+          PdfAsHelper.gotoError(getServletContext(), request, response);
+          return;
+        }
+      }
+
+      if (plainPDFDigest != null) {
+        final String signatureDataHash = PdfAsHelper
+            .getSignatureDataHash(request);
+        if (!plainPDFDigest.equalsIgnoreCase(signatureDataHash)) {
+          log.warn("Digest Hash mismatch!");
+          log.warn("Requested digest: " + plainPDFDigest);
+          log.warn("Saved     digest: " + signatureDataHash);
+
+          PdfAsHelper.setSessionException(request, response,
+              "Signature Data digest do not match!", null);
+          PdfAsHelper.gotoError(getServletContext(), request,
+              response);
+          return;
+        }
+      }
+      response.setHeader("Content-Disposition", "inline;filename="
+          + PdfAsHelper.getPDFFileName(request));
+      final String pdfCert = signedFile.getSignerCertificate();
+      if (pdfCert != null) {
+        response.setHeader("Signer-Certificate", pdfCert);
+      }
+
+      if (statisticEvent != null) {
+        if (!statisticEvent.isLogged()) {
+          statisticEvent.setStatus(Status.OK);
+
+          statisticEvent.setEndNow();
+          statisticEvent.setTimestampNow();
+          StatisticFrontend.getInstance().storeEvent(statisticEvent);
+          statisticEvent.setLogged(true);
+        }
+      }
+
+      final PDFASVerificationResponse resp = signedFile.getVerificationResponse();
+      if (resp != null) {
+        response.setHeader("CertificateCheckCode",
+            String.valueOf(resp.getCertificateCode()));
+        response.setHeader("ValueCheckCode",
+            String.valueOf(resp.getValueCode()));
+      }
+      response.setContentType("application/pdf");
+      final OutputStream os = response.getOutputStream();
+      os.write(signedData);
+      os.close();
+
+      // When data is collected destroy session!
+      if (!WebConfiguration.isKeepSignedDocument()) {
+        log.debug("Destroying signed data in session : {}", request.getSession().getId());
+        request.getSession().invalidate();
+      } else {
+        log.debug("Keeping signed data in session : {}", request.getSession().getId());
+      }
+    } else {
+      log.info("No signed pdf document available.");
+      PdfAsHelper.setSessionException(request, response,
+          "No signed pdf document available.", null);
+      PdfAsHelper.gotoError(getServletContext(), request, response);
+      
+    }
+    
+  }
+
+  private static boolean isSignedDataExpired(SignedDocument signedFile) {
+    final long now = System.currentTimeMillis();
+    final long validUntil = signedFile.getSigningTimestamp() + 300000;
+    
+    log.debug("Checking signed data valid until {} now is {}", validUntil, now);
+    return validUntil < now;
+
+  }
+
 }
diff --git a/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/servlets/ProvidePDFServlet.java b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/servlets/ProvidePDFServlet.java
index 7262586d..47469eb2 100644
--- a/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/servlets/ProvidePDFServlet.java
+++ b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/servlets/ProvidePDFServlet.java
@@ -26,32 +26,31 @@ package at.gv.egiz.pdfas.web.servlets;
 import java.io.IOException;
 import java.net.URL;
 import java.net.URLEncoder;
+import java.util.List;
 
 import javax.servlet.RequestDispatcher;
 import javax.servlet.ServletException;
 import javax.servlet.http.HttpServlet;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
-import javax.swing.text.html.HTML;
 
 import org.apache.commons.lang3.StringEscapeUtils;
-import org.codehaus.stax2.io.EscapingWriterFactory;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
+import at.gv.egiz.pdfas.api.processing.SignedDocument;
 import at.gv.egiz.pdfas.common.exceptions.PdfAsException;
 import at.gv.egiz.pdfas.web.config.WebConfiguration;
+import at.gv.egiz.pdfas.web.exception.PdfAsStoreException;
 import at.gv.egiz.pdfas.web.helper.PdfAsHelper;
 import at.gv.egiz.pdfas.web.helper.UrlParameterExtractor;
+import at.gv.egiz.pdfas.web.store.RequestStore;
+import lombok.extern.slf4j.Slf4j;
 
 /**
  * Servlet implementation class ProvidePDF
  */
+@Slf4j
 public class ProvidePDFServlet extends HttpServlet {
 	private static final long serialVersionUID = 1L;
-
-	private static final Logger logger = LoggerFactory
-			.getLogger(ProvidePDFServlet.class);
 	
 	private static final String PDF_DATA_URL = "##PDFDATAURL##";
 	
@@ -88,7 +87,7 @@ public class ProvidePDFServlet extends HttpServlet {
 			if (invokeURL == null || !WebConfiguration.isProvidePdfURLinWhitelist(invokeURL)) {
 				
 				if(invokeURL != null) {
-					logger.warn(invokeURL + " is not allowed by whitelist");
+					log.warn(invokeURL + " is not allowed by whitelist");
 				}
 				
 				if (PdfAsHelper.getResponseMode(request, response).equals(PdfAsHelper.PDF_RESPONSE_MODES.htmlform)) {								
@@ -100,60 +99,126 @@ public class ProvidePDFServlet extends HttpServlet {
 					response.getWriter().close();
 					
 				} else {
-					logger.debug("PDFResult directMode: Forward to PDFData Servlet directly");
+					log.debug("PDFResult directMode: Forward to PDFData Servlet directly");
 					RequestDispatcher dispatcher = getServletContext().getRequestDispatcher("/PDFData");
 					dispatcher.forward(request, response);
 								
 				}
 					
-			} else {
-				// Redirect Browser
-				String template = PdfAsHelper.getInvokeRedirectTemplateSL();
-				
-				URL url = new URL(invokeURL);
-				int p=url.getPort();
-				//no port, but http or https --> use default port
-				if((url.getProtocol().equalsIgnoreCase("https") || url.getProtocol().equalsIgnoreCase("http")) && p == -1){
-					p=url.getDefaultPort();
-				}
-				String invokeUrlProcessed = url.getProtocol() + "://" +   // "http" + "://
-						url.getHost() +       // "myhost"
-			             ":" +                           // ":"
-			             p +       // "8080"
-			             url.getPath();  
-				
-				template = template.replace("##INVOKE_URL##", invokeUrlProcessed);
-				
-				String extraParams = UrlParameterExtractor.buildParameterFormString(url);
-				template = template.replace("##ADD_PARAMS##", extraParams);
-				
-				byte[] signedData = PdfAsHelper.getSignedPdf(request, response);
-				if (signedData != null) {
-					template = template.replace("##PDFLENGTH##",
-							String.valueOf(signedData.length));
-				} else {
-					throw new PdfAsException("No Signature data available");
-				}
-
-				String target = PdfAsHelper.getInvokeTarget(request, response);
-				
-				if(target == null) {
-					target = "_self";
-				}
-				
-				template = template.replace("##TARGET##", StringEscapeUtils.escapeHtml4(target));
-				
-				template = template.replace("##PDFURL##",
-						URLEncoder.encode(PdfAsHelper.generatePdfURL(request, response), 
-								"UTF-8"));
-				response.setContentType("text/html");
-				response.getWriter().write(template);
-				response.getWriter().close();
+			} else {			  
+			  List<SignedDocument> signedPdfs = PdfAsHelper.getPdfSigningResponse(request).getSignedPdfs();
+			  
+			  if (signedPdfs.isEmpty()) {
+			    log.info("No signed pdf document available.");
+		      PdfAsHelper.setSessionException(request, response,
+		          "No signed pdf document available.", null);
+		      PdfAsHelper.gotoError(getServletContext(), request, response);  
+			    
+			  } else if (signedPdfs.size() == 1) {
+			    provideSingleFile(request, response, signedPdfs.get(0), invokeURL);
+			    
+			    
+			  } else {
+			    provideTokenToGetMultipleFiles(request, response, invokeURL);
+			    
+			  }			 
 			}
+			
 		} catch (Exception e) {
-			PdfAsHelper.setSessionException(request, response, e.getMessage(),
-					e);
+			PdfAsHelper.setSessionException(request, response, e.getMessage(), e);
 			PdfAsHelper.gotoError(getServletContext(), request, response);
+			
 		}
 	}
+
+  private void provideTokenToGetMultipleFiles(HttpServletRequest request, HttpServletResponse response,
+      String invokeURL) throws IOException, PdfAsStoreException {
+
+    String template = PdfAsHelper.getInvokeRedirectTemplateMoreFiles();
+    
+    URL url = new URL(invokeURL);
+    int p=url.getPort();
+    //no port, but http or https --> use default port
+    if((url.getProtocol().equalsIgnoreCase("https") || url.getProtocol().equalsIgnoreCase("http")) && p == -1){
+      p=url.getDefaultPort();
+    }
+    String invokeUrlProcessed = url.getProtocol() + "://" +   // "http" + "://
+        url.getHost() +       // "myhost"
+               ":" +                           // ":"
+               p +       // "8080"
+               url.getPath();  
+    
+    template = template.replace("##INVOKE_URL##", invokeUrlProcessed);
+    
+    String extraParams = UrlParameterExtractor.buildParameterFormString(url);
+    template = template.replace("##ADD_PARAMS##", extraParams);
+
+    
+    String target = PdfAsHelper.getInvokeTarget(request, response);    
+    if(target == null) {
+      target = "_self";
+      
+    }    
+    template = template.replace("##TARGET##", StringEscapeUtils.escapeHtml4(target));
+    
+    String accessToken = RequestStore.getInstance().createNewResponseEntry(PdfAsHelper.getPdfSigningResponse(request));                
+    template = template.replace("##RESPONSETOKEN##", accessToken);
+    
+    response.setContentType("text/html");
+    response.getWriter().write(template);
+    response.getWriter().close();
+    
+    
+    
+        
+    
+  }
+
+  private void provideSingleFile(HttpServletRequest request, HttpServletResponse response, SignedDocument signedDocument, String invokeURL) throws IOException, PdfAsException {
+    // Redirect Browser
+    String template = PdfAsHelper.getInvokeRedirectTemplateSL();
+    
+    URL url = new URL(invokeURL);
+    int p=url.getPort();
+    //no port, but http or https --> use default port
+    if((url.getProtocol().equalsIgnoreCase("https") || url.getProtocol().equalsIgnoreCase("http")) && p == -1){
+      p=url.getDefaultPort();
+    }
+    String invokeUrlProcessed = url.getProtocol() + "://" +   // "http" + "://
+        url.getHost() +       // "myhost"
+               ":" +                           // ":"
+               p +       // "8080"
+               url.getPath();  
+    
+    template = template.replace("##INVOKE_URL##", invokeUrlProcessed);
+    
+    String extraParams = UrlParameterExtractor.buildParameterFormString(url);
+    template = template.replace("##ADD_PARAMS##", extraParams);
+    
+    
+    //TODO: implement use-case if result contains more than one file
+    byte[] signedData = PdfAsHelper.getPdfSigningResponse(request).getSignedPdfs().get(0).getOutputData();
+    if (signedData != null) {
+      template = template.replace("##PDFLENGTH##",
+          String.valueOf(signedData.length));
+    } else {      
+      throw new PdfAsException("No Signature data available");
+    }
+
+    String target = PdfAsHelper.getInvokeTarget(request, response);
+    
+    if(target == null) {
+      target = "_self";
+    }
+    
+    template = template.replace("##TARGET##", StringEscapeUtils.escapeHtml4(target));
+    
+    template = template.replace("##PDFURL##",
+        URLEncoder.encode(PdfAsHelper.generatePdfURL(request, response), 
+            "UTF-8"));
+    response.setContentType("text/html");
+    response.getWriter().write(template);
+    response.getWriter().close();
+    
+  }
 }
diff --git a/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/servlets/UIEntryPointServlet.java b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/servlets/UIEntryPointServlet.java
index 664dd9b3..d7a3d3c6 100644
--- a/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/servlets/UIEntryPointServlet.java
+++ b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/servlets/UIEntryPointServlet.java
@@ -24,18 +24,14 @@
 package at.gv.egiz.pdfas.web.servlets;
 
 import java.io.IOException;
-import java.util.Map;
 
 import javax.servlet.ServletException;
 import javax.servlet.http.HttpServlet;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
+import at.gv.egiz.pdfas.api.processing.PdfasSignRequest;
 import at.gv.egiz.pdfas.api.ws.PDFASSignParameters.Connector;
-import at.gv.egiz.pdfas.api.ws.PDFASSignRequest;
 import at.gv.egiz.pdfas.common.exceptions.PdfAsException;
 import at.gv.egiz.pdfas.lib.api.verify.VerifyParameter.SignatureVerificationLevel;
 import at.gv.egiz.pdfas.web.config.WebConfiguration;
@@ -45,15 +41,14 @@ import at.gv.egiz.pdfas.web.helper.DigestHelper;
 import at.gv.egiz.pdfas.web.helper.PdfAsHelper;
 import at.gv.egiz.pdfas.web.stats.StatisticEvent;
 import at.gv.egiz.pdfas.web.store.RequestStore;
+import lombok.extern.slf4j.Slf4j;
 
+@Slf4j
 public class UIEntryPointServlet extends HttpServlet {
 	private static final long serialVersionUID = 1L;
 
 	public static final String REQUEST_ID_PARAM = "reqId";
 
-	private static final Logger logger = LoggerFactory
-			.getLogger(UIEntryPointServlet.class);
-
 	public UIEntryPointServlet() {
 	}
 
@@ -72,13 +67,16 @@ public class UIEntryPointServlet extends HttpServlet {
 	protected void doProcess(HttpServletRequest req, HttpServletResponse resp)
 			throws ServletException, IOException {
 		try {
+		  // invalidate existing http sessions at first
+	    req.getSession().invalidate();
+		  
 			String storeId = req.getParameter(REQUEST_ID_PARAM);
 
 			if (storeId == null) {
 				throw new PdfAsStoreException("Wrong Parameters");
 			}
 
-			PDFASSignRequest pdfAsRequest = RequestStore.getInstance()
+			PdfasSignRequest pdfAsRequest = RequestStore.getInstance()
 					.fetchStoreEntry(storeId);
 
 			if (pdfAsRequest == null) {
@@ -91,16 +89,15 @@ public class UIEntryPointServlet extends HttpServlet {
 
 			PdfAsHelper.setStatisticEvent(req, resp, statisticEvent);
 			
-			Connector connector = pdfAsRequest.getParameters().getConnector();
+			Connector connector = pdfAsRequest.getCoreParams().getConnector();
 
-			String invokeUrl = pdfAsRequest.getParameters().getInvokeURL();
+			String invokeUrl = pdfAsRequest.getCoreParams().getInvokeUrl();
 			PdfAsHelper.setInvokeURL(req, resp, invokeUrl);
 
-			String invokeTarget = pdfAsRequest.getParameters()
-					.getInvokeTarget();
+			String invokeTarget = pdfAsRequest.getCoreParams().getInvokeTarget();
 			PdfAsHelper.setInvokeTarget(req, resp, invokeTarget);
 
-			String errorUrl = pdfAsRequest.getParameters().getInvokeErrorURL();
+			String errorUrl = pdfAsRequest.getCoreParams().getInvokeErrorUrl();
 			PdfAsHelper.setErrorURL(req, resp, errorUrl);
 
 			SignatureVerificationLevel lvl = SignatureVerificationLevel.INTEGRITY_ONLY_VERIFICATION;
@@ -116,17 +113,16 @@ public class UIEntryPointServlet extends HttpServlet {
 			}
 			PdfAsHelper.setVerificationLevel(req, lvl);
 
-			if (pdfAsRequest.getInputData() == null) {
+			if (pdfAsRequest.hasNext() && pdfAsRequest.getInput().get(0).getInputData() == null) {
 				throw new PdfAsException("No Signature data available");
 			}
 
-			String pdfDataHash = DigestHelper.getHexEncodedHash(pdfAsRequest
-					.getInputData());
+			String pdfDataHash = DigestHelper.getHexEncodedHash(pdfAsRequest.getInput().get(0).getInputData());
 
 			PdfAsHelper.setSignatureDataHash(req, pdfDataHash);
-			logger.debug("Storing signatures data hash: " + pdfDataHash);
+			log.debug("Storing signatures data hash: " + pdfDataHash);
 
-			logger.debug("Starting signature creation with: " + connector);
+			log.debug("Starting signature creation with: " + connector);
 
 			// IPlainSigner signer;
 			if (connector.equals(Connector.BKU)
@@ -163,26 +159,8 @@ public class UIEntryPointServlet extends HttpServlet {
 					}
 				}
 				
-				Map<String, String> map = null;
-				if (pdfAsRequest.getParameters().getPreprocessor() != null) {
-					map = pdfAsRequest.getParameters().getPreprocessor()
-							.getMap();
-				}
+				PdfAsHelper.startSignature(req, resp, getServletContext(), connector.toString(), pdfAsRequest);
 				
-				Map<String, String> overwrite = null;
-				if (pdfAsRequest.getParameters().getOverrides() != null) {
-					overwrite = pdfAsRequest.getParameters().getOverrides()
-							.getMap();
-				}
-				//TODO alex
-				Map<String, String> dynamicSignatureBlockArguments = pdfAsRequest.getSignatureBlockParameters();
-
-				PdfAsHelper.startSignature(req, resp, getServletContext(),
-						pdfAsRequest.getInputData(), connector.toString(),
-						pdfAsRequest.getParameters().getPosition(),
-						pdfAsRequest.getParameters().getTransactionId(),
-						pdfAsRequest.getParameters().getProfile(), map, 
-						overwrite, dynamicSignatureBlockArguments);
 			} else {
 				throw new PdfAsWebException("Invalid connector ("
 						+ Connector.BKU + " | " + Connector.ONLINEBKU + " | "
@@ -190,7 +168,7 @@ public class UIEntryPointServlet extends HttpServlet {
 			}
 
 		} catch (Throwable e) {
-			logger.warn("Failed to process Request: ", e);
+			log.warn("Failed to process Request: ", e);
 			PdfAsHelper.setSessionException(req, resp, e.getMessage(), e);
 			PdfAsHelper.gotoError(getServletContext(), req, resp);
 		}
diff --git a/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/servlets/VerifyServlet.java b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/servlets/VerifyServlet.java
index bc5f2e2d..003a4a73 100644
--- a/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/servlets/VerifyServlet.java
+++ b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/servlets/VerifyServlet.java
@@ -50,10 +50,10 @@ import at.gv.egiz.pdfas.web.helper.RemotePDFFetcher;
 import at.gv.egiz.pdfas.web.helper.VerifyEncoder;
 import at.gv.egiz.pdfas.web.helper.VerifyResultEncoder;
 import at.gv.egiz.pdfas.web.stats.StatisticEvent;
-import at.gv.egiz.pdfas.web.stats.StatisticFrontend;
 import at.gv.egiz.pdfas.web.stats.StatisticEvent.Operation;
 import at.gv.egiz.pdfas.web.stats.StatisticEvent.Source;
 import at.gv.egiz.pdfas.web.stats.StatisticEvent.Status;
+import at.gv.egiz.pdfas.web.stats.StatisticFrontend;
 
 /**
  * Servlet implementation class VerifyServlet
@@ -84,6 +84,9 @@ public class VerifyServlet extends HttpServlet {
 	protected void doGet(HttpServletRequest request,
 			HttpServletResponse response) throws ServletException, IOException {
 
+	  // invalidate existing http sessions at first
+    request.getSession().invalidate();
+	  
 		logger.info("Get verify request");
 
 		String errorUrl = PdfAsParameterExtractor.getInvokeErrorURL(request);
@@ -138,6 +141,9 @@ public class VerifyServlet extends HttpServlet {
 	protected void doPost(HttpServletRequest request,
 			HttpServletResponse response) throws ServletException, IOException {
 
+	  // invalidate existing http sessions at first
+    request.getSession().invalidate();
+	  
 		logger.info("Post verify request");
 
 		String errorUrl = PdfAsParameterExtractor.getInvokeErrorURL(request);
diff --git a/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/store/IRequestStore.java b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/store/IRequestStore.java
index f07a36ce..643d3ea0 100644
--- a/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/store/IRequestStore.java
+++ b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/store/IRequestStore.java
@@ -23,11 +23,16 @@
  ******************************************************************************/
 package at.gv.egiz.pdfas.web.store;
 
-import at.gv.egiz.pdfas.api.ws.PDFASSignRequest;
+import at.gv.egiz.pdfas.api.processing.PdfasSignRequest;
+import at.gv.egiz.pdfas.api.processing.PdfasSignResponse;
 import at.gv.egiz.pdfas.web.stats.StatisticEvent;
 
 public interface IRequestStore {
 	public StatisticEvent fetchStatisticEntry(String id);
-	public String createNewStoreEntry(PDFASSignRequest request, StatisticEvent event);
-	public PDFASSignRequest fetchStoreEntry(String id);
+	public String createNewStoreEntry(PdfasSignRequest request, StatisticEvent event);
+	public PdfasSignRequest fetchStoreEntry(String id);
+	
+	public String createNewResponseEntry(PdfasSignResponse response);
+	public PdfasSignResponse fetchStoreResponse(String id);
+	
 }
diff --git a/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/store/InMemoryRequestStore.java b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/store/InMemoryRequestStore.java
index f712a894..6ab58ce0 100644
--- a/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/store/InMemoryRequestStore.java
+++ b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/store/InMemoryRequestStore.java
@@ -23,26 +23,35 @@
  ******************************************************************************/
 package at.gv.egiz.pdfas.web.store;
 
-import java.util.HashMap;
+import java.util.Map;
 import java.util.UUID;
 
-import at.gv.egiz.pdfas.api.ws.PDFASSignRequest;
+import org.apache.commons.collections4.map.PassiveExpiringMap;
+
+import at.gv.egiz.pdfas.api.processing.PdfasSignRequest;
+import at.gv.egiz.pdfas.api.processing.PdfasSignResponse;
 import at.gv.egiz.pdfas.web.stats.StatisticEvent;
 
 public class InMemoryRequestStore implements IRequestStore {
 
+  // expires after 10 minutes
+  private static final long DEFAULT_EXPIRATION = 10 * 60 * 1000;
+  
+  private Map<String, PdfasSignRequest> reqStore = new PassiveExpiringMap<>(DEFAULT_EXPIRATION);
+  private Map<String, PdfasSignResponse> respStore = new PassiveExpiringMap<>(DEFAULT_EXPIRATION);
+  private Map<String, StatisticEvent> statEvents = new PassiveExpiringMap<>(DEFAULT_EXPIRATION);
+  
 	public InMemoryRequestStore() {
+		  
 	}
 	
-	private HashMap<String, PDFASSignRequest> store = new HashMap<String, PDFASSignRequest>();
-	private HashMap<String, StatisticEvent> statEvents = new HashMap<String, StatisticEvent>();
-	
-	public String createNewStoreEntry(PDFASSignRequest request, StatisticEvent event) {
+	public String createNewStoreEntry(PdfasSignRequest request, StatisticEvent event) {
 		UUID id = UUID.randomUUID();
 		String sid = id.toString();
-		this.store.put(sid, request);
+		this.reqStore.put(sid, request);
 		this.statEvents.put(sid, event);
 		return sid;
+		 	
 	}
 
 	public StatisticEvent fetchStatisticEntry(String id) {
@@ -50,17 +59,41 @@ public class InMemoryRequestStore implements IRequestStore {
 			StatisticEvent event = statEvents.get(id);
 			statEvents.remove(id);
 			return event;
+			
 		}
+		
 		return null;
 	}
 	
-	public PDFASSignRequest fetchStoreEntry(String id) {
-		if(store.containsKey(id)) {
-			PDFASSignRequest request = store.get(id);
-			store.remove(id);
+	public PdfasSignRequest fetchStoreEntry(String id) {
+		if(reqStore.containsKey(id)) {
+			PdfasSignRequest request = reqStore.get(id);
+			reqStore.remove(id);
 			return request;
+			
 		}
+		
 		return null;
 	}
 
+  @Override
+  public String createNewResponseEntry(PdfasSignResponse response) {
+    String sid = UUID.randomUUID().toString();
+    this.respStore.put(sid, response);
+    return sid;
+    
+  }
+
+  @Override
+  public PdfasSignResponse fetchStoreResponse(String id) {
+    if (respStore.containsKey(id)) {
+      PdfasSignResponse response = respStore.get(id);
+      respStore.remove(id);
+      return response;
+      
+    }
+    
+    return null;
+  }
+
 }
diff --git a/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/ws/PDFASSigningImpl.java b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/ws/PDFASSigningImpl.java
index 531abdf1..2c248059 100644
--- a/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/ws/PDFASSigningImpl.java
+++ b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/ws/PDFASSigningImpl.java
@@ -3,19 +3,19 @@
  * PDF-AS has been contracted by the E-Government Innovation Center EGIZ, a
  * joint initiative of the Federal Chancellery Austria and Graz University of
  * Technology.
- * 
+ *
  * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
  * the European Commission - subsequent versions of the EUPL (the "Licence");
  * You may not use this work except in compliance with the Licence.
  * You may obtain a copy of the Licence at:
  * http://www.osor.eu/eupl/
- * 
+ *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the Licence is distributed on an "AS IS" basis,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the Licence for the specific language governing permissions and
  * limitations under the Licence.
- * 
+ *
  * This product combines work with different licenses. See the "NOTICE" text
  * file for details on the various modules and licenses.
  * The "NOTICE" text file is part of the distribution. Any derivative works
@@ -26,20 +26,29 @@ package at.gv.egiz.pdfas.web.ws;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Map;
+import java.util.stream.Collectors;
 
 import javax.jws.WebService;
 import javax.xml.ws.WebServiceException;
 import javax.xml.ws.soap.MTOM;
 
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
+import org.apache.commons.lang3.StringUtils;
 
+import at.gv.egiz.pdfas.api.processing.CoreSignParams;
+import at.gv.egiz.pdfas.api.processing.DocumentToSign;
+import at.gv.egiz.pdfas.api.processing.PdfasSignRequest;
+import at.gv.egiz.pdfas.api.processing.PdfasSignResponse;
+import at.gv.egiz.pdfas.api.processing.SignedDocument;
 import at.gv.egiz.pdfas.api.ws.PDFASBulkSignRequest;
 import at.gv.egiz.pdfas.api.ws.PDFASBulkSignResponse;
 import at.gv.egiz.pdfas.api.ws.PDFASSignParameters.Connector;
 import at.gv.egiz.pdfas.api.ws.PDFASSignRequest;
 import at.gv.egiz.pdfas.api.ws.PDFASSignResponse;
 import at.gv.egiz.pdfas.api.ws.PDFASSigning;
+import at.gv.egiz.pdfas.api.ws.PdfasGetMultipleRequest;
+import at.gv.egiz.pdfas.api.ws.PdfasSignMultipleRequest;
+import at.gv.egiz.pdfas.api.ws.PdfasSignMultipleResponse;
+import at.gv.egiz.pdfas.api.ws.PdfasSignedDocument;
 import at.gv.egiz.pdfas.api.ws.VerificationLevel;
 import at.gv.egiz.pdfas.common.exceptions.PDFASError;
 import at.gv.egiz.pdfas.lib.api.verify.VerifyParameter.SignatureVerificationLevel;
@@ -53,188 +62,460 @@ import at.gv.egiz.pdfas.web.stats.StatisticEvent.Source;
 import at.gv.egiz.pdfas.web.stats.StatisticEvent.Status;
 import at.gv.egiz.pdfas.web.stats.StatisticFrontend;
 import at.gv.egiz.pdfas.web.store.RequestStore;
+import lombok.SneakyThrows;
+import lombok.extern.slf4j.Slf4j;
 
+@Slf4j
 @MTOM
 @WebService(endpointInterface = "at.gv.egiz.pdfas.api.ws.PDFASSigning")
 public class PDFASSigningImpl implements PDFASSigning {
 
-	private static final Logger logger = LoggerFactory
-			.getLogger(PDFASSigningImpl.class);
-
-	/*
-	 * public byte[] signPDFDokument(byte[] inputDocument, PDFASSignParameters
-	 * parameters) { checkSoapSignEnabled(); try { return
-	 * PdfAsHelper.synchornousServerSignature(inputDocument, parameters); }
-	 * catch (Throwable e) { logger.error("Server Signature failed.", e); if
-	 * (WebConfiguration.isShowErrorDetails()) { throw new
-	 * WebServiceException("Server Signature failed.", e); } else { throw new
-	 * WebServiceException("Server Signature failed."); } } }
-	 */
-
-	public PDFASSignResponse signPDFDokument(PDFASSignRequest request) {
-		logger.debug("Starting SOAP Sign Request");
-		checkSoapSignEnabled();
-		if (request == null) {
-			logger.warn("SOAP Sign Request is null!");
-			return null;
-		}
-		
-		StatisticEvent statisticEvent = new StatisticEvent();
-		statisticEvent.setSource(Source.SOAP);
-		statisticEvent.setOperation(Operation.SIGN);
-		statisticEvent.setUserAgent(UserAgentFilter.getUserAgent());
-		statisticEvent.setStartNow();
-		PDFASSignResponse response = new PDFASSignResponse();
-		try {
-			if(request.getParameters().getConnector() == null) {
-				throw new WebServiceException(
-						"Invalid connector value!");
-			}
-			
-			statisticEvent.setFilesize(request.getInputData().length);
-			statisticEvent.setProfileId(request.getParameters().getProfile());
-			statisticEvent.setDevice(request.getParameters().getConnector().toString());
-			
-			Map<String, String> preProcessor = null;
-			if(request.getParameters().getPreprocessor() != null) {
-				preProcessor = request.getParameters().getPreprocessor().getMap();
-			}
-			
-			if (request.getParameters().getConnector().equals(Connector.MOA)
-					|| request.getParameters().getConnector()
-							.equals(Connector.JKS)) {
-				// Plain server based signatures!!
-				response = PdfAsHelper.synchronousServerSignature(
-						request.getInputData(), request.getParameters(), request.getSignatureBlockParameters());
-
-
-				VerifyResult verifyResult = null;
-				if (request.getVerificationLevel() != null && 
-						request.getVerificationLevel().equals(
-						VerificationLevel.FULL_CERT_PATH)) {
-					List<VerifyResult> verResults = PdfAsHelper
-							.synchronousVerify(
-									response.getSignedPDF(),
-									-1,
-									SignatureVerificationLevel.FULL_VERIFICATION, 
-									preProcessor);
-
-					if (verResults.size() < 1) {
-						throw new WebServiceException(
-								"Document verification failed! " + verResults.size());
-					}
-					verifyResult = verResults.get(verResults.size() - 1);
-				} else {
-					List<VerifyResult> verResults = PdfAsHelper
-							.synchronousVerify(
-									response.getSignedPDF(),
-									-1,
-									SignatureVerificationLevel.INTEGRITY_ONLY_VERIFICATION, 
-									preProcessor);
-
-					if (verResults.size() < 1) {
-						throw new WebServiceException(
-								"Document verification failed! " + verResults.size());
-					}
-					verifyResult = verResults.get(verResults.size() - 1);
-				}
-
-				if(verifyResult.getValueCheckCode().getCode() == 0) {
-					statisticEvent.setStatus(Status.OK);
-					statisticEvent.setEndNow();
-					statisticEvent.setTimestampNow();
-					StatisticFrontend.getInstance().storeEvent(statisticEvent);
-					statisticEvent.setLogged(true);
-				} else {
-					statisticEvent.setStatus(Status.ERROR);
-					statisticEvent.setErrorCode(verifyResult.getValueCheckCode().getCode());
-					statisticEvent.setEndNow();
-					statisticEvent.setTimestampNow();
-					StatisticFrontend.getInstance().storeEvent(statisticEvent);
-					statisticEvent.setLogged(true);
-				}
-				
-				response.getVerificationResponse().setCertificateCode(
-						verifyResult.getCertificateCheck().getCode());
-				response.getVerificationResponse().setValueCode(
-						verifyResult.getValueCheckCode().getCode());
-
-			} else {
-				// Signatures with user interaction!!
-				String id = RequestStore.getInstance().createNewStoreEntry(
-						request, statisticEvent);
-
-				if (id == null) {
-					throw new WebServiceException("Failed to store request");
-				}
-
-				String userEntryURL = PdfAsHelper.generateUserEntryURL(id);
-
-				logger.debug("Generated request store: " + id);
-				logger.debug("Generated UI URL: " + userEntryURL);
-
-				if (userEntryURL == null) {
-					throw new WebServiceException(
-							"Failed to generate User Entry URL");
-				}
-
-				response.setRedirectUrl(userEntryURL);
-			}
-		} catch (Throwable e) {
-			
-			statisticEvent.setStatus(Status.ERROR);
-			statisticEvent.setException(e);
-			if(e instanceof PDFASError) {
-				statisticEvent.setErrorCode(((PDFASError)e).getCode());
-			}
-			statisticEvent.setEndNow();
-			statisticEvent.setTimestampNow();
-			StatisticFrontend.getInstance().storeEvent(statisticEvent);
-			statisticEvent.setLogged(true);
-			
-			logger.warn("Error in Soap Service", e);
-			if (e.getCause() != null) {
-				response.setError(e.getCause().getMessage());
-			} else {
-				response.setError(e.getMessage());
-			}
-		} finally {
-			logger.debug("Done SOAP Sign Request");
-		}
-		response.setRequestID(request.getRequestID());
-		return response;
-	}
-
-	public PDFASBulkSignResponse signPDFDokument(PDFASBulkSignRequest request) {
-		logger.debug("Starting SOAP BulkSign Request");
-		checkSoapSignEnabled();
-		List<PDFASSignResponse> responses = new ArrayList<PDFASSignResponse>();
-		if (request.getSignRequests() != null) {
-			for (int i = 0; i < request.getSignRequests().size(); i++) {
-				PDFASSignResponse response = signPDFDokument(request
-						.getSignRequests().get(i));
-				if (response != null) {
-					responses.add(response);
-				}
-			}
-			PDFASBulkSignResponse response = new PDFASBulkSignResponse();
-			response.setSignResponses(responses);
-			logger.debug("Done SOAP Sign Request");
-			return response;
-		}
-		logger.warn("Server Signature failed. [PDFASBulkSignRequest is NULL]");
-		
-		if (WebConfiguration.isShowErrorDetails()) {
-			throw new WebServiceException("PDFASBulkSignRequest is NULL");
-		} else {
-			throw new WebServiceException("Server Signature failed.");
-		}
-	}
-
-	private void checkSoapSignEnabled() {
-		if (!WebConfiguration.getSoapSignEnabled()) {
-			throw new WebServiceException("Service disabled!");
-		}
-	}
+  /*
+   * public byte[] signPDFDokument(byte[] inputDocument, PDFASSignParameters
+   * parameters) { checkSoapSignEnabled(); try { return
+   * PdfAsHelper.synchornousServerSignature(inputDocument, parameters); } catch
+   * (Throwable e) { logger.error("Server Signature failed.", e); if
+   * (WebConfiguration.isShowErrorDetails()) { throw new
+   * WebServiceException("Server Signature failed.", e); } else { throw new
+   * WebServiceException("Server Signature failed."); } } }
+   */
 
+  @Override
+  public PDFASSignResponse signPDFDokument(PDFASSignRequest request) {
+    log.debug("Starting SOAP Sign Request");
+    checkSoapSignEnabled();
+    if (request == null) {
+      log.warn("SOAP Sign Request is null!");
+      return null;
+    }
+
+    // map request into internal data-structure
+    final PdfasSignRequest internalReq = buildOperationRequest(request);
+
+    final StatisticEvent statisticEvent = new StatisticEvent();
+    statisticEvent.setSource(Source.SOAP);
+    statisticEvent.setOperation(Operation.SIGN);
+    statisticEvent.setUserAgent(UserAgentFilter.getUserAgent());
+    statisticEvent.setProfileId(request.getParameters().getProfile());
+    statisticEvent.setDevice(request.getParameters().getConnector().toString());
+    statisticEvent.setStartNow();
+
+    PDFASSignResponse response = new PDFASSignResponse();
+    try {
+      if (request.getParameters().getConnector() == null) {
+        throw new WebServiceException(
+            "Invalid connector value!");
+      }
+
+      if (request.getParameters().getConnector().equals(Connector.MOA)
+          || request.getParameters().getConnector()
+              .equals(Connector.JKS)) {
+
+        // perform technical signing process
+        final PdfasSignResponse internalResp = PdfAsHelper.synchronousServerSignature(internalReq);
+
+        // validate signatures
+        internalResp.getSignedPdfs().forEach(el -> validatePdfSignature(el, internalReq, statisticEvent));
+
+        // must be done later, because we should verify signed documents before
+        response = buildResponseFromInternalResult(internalResp, internalReq.getRequestID());
+
+      } else {
+        // Signatures with user interaction!!
+        final String id = RequestStore.getInstance().createNewStoreEntry(internalReq, statisticEvent);
+
+        if (id == null) {
+          throw new WebServiceException("Failed to store request");
+        }
+
+        final String userEntryURL = PdfAsHelper.generateUserEntryURL(id);
+
+        log.debug("Generated request store: " + id);
+        log.debug("Generated UI URL: " + userEntryURL);
+
+        if (userEntryURL == null) {
+          throw new WebServiceException(
+              "Failed to generate User Entry URL");
+        }
+
+        response.setRedirectUrl(userEntryURL);
+      }
+    } catch (final Throwable e) {
+
+      statisticEvent.setStatus(Status.ERROR);
+      statisticEvent.setException(e);
+      if (e instanceof PDFASError) {
+        statisticEvent.setErrorCode(((PDFASError) e).getCode());
+      }
+      statisticEvent.setEndNow();
+      statisticEvent.setTimestampNow();
+      StatisticFrontend.getInstance().storeEvent(statisticEvent);
+      statisticEvent.setLogged(true);
+
+      log.warn("Error in Soap Service", e);
+      if (e.getCause() != null) {
+        response.setError(e.getCause().getMessage());
+
+      } else {
+        response.setError(e.getMessage());
+
+      }
+
+    } finally {
+      log.debug("Done SOAP Sign Request");
+
+    }
+
+    response.setRequestID(request.getRequestID());
+    return response;
+
+  }
+
+  @Override
+  public PDFASBulkSignResponse signPDFDokument(PDFASBulkSignRequest request) {
+    log.debug("Starting SOAP BulkSign Request");
+    checkSoapSignEnabled();
+    final List<PDFASSignResponse> responses = new ArrayList<>();
+    if (request.getSignRequests() != null) {
+      for (int i = 0; i < request.getSignRequests().size(); i++) {
+        final PDFASSignResponse response = signPDFDokument(request
+            .getSignRequests().get(i));
+        if (response != null) {
+          responses.add(response);
+        }
+      }
+      final PDFASBulkSignResponse response = new PDFASBulkSignResponse();
+      response.setSignResponses(responses);
+      log.debug("Done SOAP Sign Request");
+      return response;
+    }
+    log.warn("Server Signature failed. [PDFASBulkSignRequest is NULL]");
+
+    if (WebConfiguration.isShowErrorDetails()) {
+      throw new WebServiceException("PDFASBulkSignRequest is NULL");
+    } else {
+      throw new WebServiceException("Server Signature failed.");
+    }
+  }
+
+  @Override
+  public PdfasSignMultipleResponse signPDFDokument(PdfasSignMultipleRequest request) {
+
+    log.debug("Starting SOAP Bulk-Sign Request");
+    checkSoapSignEnabled();
+    if (request == null) {
+      log.warn("SOAP Sign Request is null!");
+      return null;
+    }
+
+    // map request into internal data-structure
+    final PdfasSignRequest internalReq = buildOperationRequest(request);
+
+    final StatisticEvent statisticEvent = new StatisticEvent();
+    statisticEvent.setSource(Source.SOAP);
+    statisticEvent.setOperation(Operation.SIGNBULK);
+    statisticEvent.setUserAgent(UserAgentFilter.getUserAgent());
+    statisticEvent.setDevice(internalReq.getCoreParams().getConnector().toString());
+    statisticEvent.setStartNow();
+
+    PdfasSignMultipleResponse response = new PdfasSignMultipleResponse();
+    try {
+      if (internalReq.getCoreParams().getConnector() == null) {
+        throw new WebServiceException(
+            "Invalid connector value!");
+      }
+
+      if (internalReq.getCoreParams().getConnector().equals(Connector.MOA)
+          || internalReq.getCoreParams().getConnector()
+              .equals(Connector.JKS)) {
+
+        // perform technical signing process
+        final PdfasSignResponse internalResp = PdfAsHelper.synchronousServerSignature(internalReq);
+
+        // validate signatures
+        internalResp.getSignedPdfs().forEach(el -> validatePdfSignature(el, internalReq, statisticEvent));
+
+        // must be done later, because we should verify signed documents before
+        response = buildMultiResponseFromInternalResult(internalResp, internalReq.getRequestID(), internalReq
+            .getCoreParams().getTransactionId());
+
+      } else {
+        // Signatures with user interaction!!
+        final String id = RequestStore.getInstance().createNewStoreEntry(internalReq, statisticEvent);
+
+        if (id == null) {
+          throw new WebServiceException("Failed to store request");
+        }
+
+        final String userEntryURL = PdfAsHelper.generateUserEntryURL(id);
+
+        log.debug("Generated request store: " + id);
+        log.debug("Generated UI URL: " + userEntryURL);
+
+        if (userEntryURL == null) {
+          throw new WebServiceException(
+              "Failed to generate User Entry URL");
+        }
+
+        response.setRedirectUrl(userEntryURL);
+        response.setRequestID(request.getRequestID());
+
+      }
+    } catch (final Throwable e) {
+
+      statisticEvent.setStatus(Status.ERROR);
+      statisticEvent.setException(e);
+      if (e instanceof PDFASError) {
+        statisticEvent.setErrorCode(((PDFASError) e).getCode());
+      }
+      statisticEvent.setEndNow();
+      statisticEvent.setTimestampNow();
+      StatisticFrontend.getInstance().storeEvent(statisticEvent);
+      statisticEvent.setLogged(true);
+
+      log.warn("Error in Soap Service", e);
+      if (e.getCause() != null) {
+        response.setError(e.getCause().getMessage());
+
+      } else {
+        response.setError(e.getMessage());
+
+      }
+
+    } finally {
+      log.debug("Done SOAP Sign Request");
+
+    }
+
+    return response;
+
+  }
+
+  @Override
+  public PdfasSignMultipleResponse getSignedDokument(PdfasGetMultipleRequest request) {
+    log.debug("Starting SOAP Get-Signed Request");
+    checkSoapSignEnabled();
+    if (request == null) {
+      log.warn("SOAP Get-Signed Request is null!");
+      return null;
+      
+    }
+
+    final PdfasSignMultipleResponse response = new PdfasSignMultipleResponse();
+    
+    try {
+      if (StringUtils.isEmpty(request.getToken())) {
+        log.warn("SOAP Get-Signed Request contains NO token");
+        throw new WebServiceException("SOAP Get-Signed Request contains NO token");
+        
+      }
+      
+      final PdfasSignResponse result = RequestStore.getInstance().fetchStoreResponse(request.getToken());
+      if (result != null) {  
+        response.setRequestID(result.getRequestId());
+        response.setTransactionId(result.getTransactionId());
+        response.setOutput(result.getSignedPdfs().stream()
+            .map(el -> {
+              PdfasSignedDocument out = new PdfasSignedDocument();
+              out.setFileName(el.getFileName());
+              out.setOutputData(el.getOutputData());
+              out.setVerificationResponse(el.getVerificationResponse());
+              return out;
+              
+            })
+            .collect(Collectors.toList()));
+                            
+      } else {
+        log.warn("SOAP Get-Signed Request token is unknown or expired");
+        throw new WebServiceException("SOAP Get-Signed Request token is unknown or expired");
+        
+      }
+            
+    } catch (final Throwable e) {
+
+      log.warn("Error in Soap Service", e);
+      if (e.getCause() != null) {
+        response.setError(e.getCause().getMessage());
+
+      } else {
+        response.setError(e.getMessage());
+
+      }
+
+    } finally {
+      log.debug("Done SOAP Sign Request");
+
+    }
+    
+    return response;
+
+  }
+
+  private PdfasSignRequest buildOperationRequest(PdfasSignMultipleRequest request) {
+    final PdfasSignRequest data = new PdfasSignRequest();
+    data.setRequestID(request.getRequestID());
+    data.setVerificationLevel(request.getVerificationLevel());
+
+    final CoreSignParams coreParams = new CoreSignParams();
+    coreParams.setSignatureBlockParameters(request.getSignatureBlockParameters());
+    coreParams.setConnector(request.getConnector());
+    coreParams.setKeyIdentifier(request.getKeyIdentifier());
+    coreParams.setOverrides(
+        request.getOverrides() != null ? request.getOverrides().getMap() : null);
+    coreParams.setPreprocessor(
+        request.getPreprocessor() != null ? request.getPreprocessor().getMap() : null);
+    coreParams.setInvokeErrorUrl(request.getInvokeErrorUrl());
+    coreParams.setInvokeTarget(request.getInvokeTarget());
+    coreParams.setInvokeUrl(request.getInvokeUrl());
+    coreParams.setTransactionId(request.getTransactionId());
+    data.setCoreParams(coreParams);
+
+    request.getInput().forEach(el -> {
+      final DocumentToSign document = new DocumentToSign();
+      document.setInputData(el.getInputData());
+      document.setPosition(el.getPosition());
+      document.setProfile(el.getProfile());
+      document.setQrCodeContent(el.getQrCodeContent());
+      document.setFileName(el.getFileName());
+      data.addDocumentToSign(document);
+
+    });
+
+    return data;
+
+  }
+
+  private PdfasSignMultipleResponse buildMultiResponseFromInternalResult(PdfasSignResponse internalResp,
+      String reqId, String transactionId) {
+    final PdfasSignMultipleResponse resp = new PdfasSignMultipleResponse();
+    resp.setRequestID(reqId);
+    resp.setTransactionId(transactionId);
+    resp.setOutput(
+        internalResp.getSignedPdfs().stream()
+            .map(el -> {
+              final PdfasSignedDocument out = new PdfasSignedDocument();
+              out.setFileName(el.getFileName());
+              out.setOutputData(el.getOutputData());
+              out.setVerificationResponse(el.getVerificationResponse());
+              return out;
+            })
+            .collect(Collectors.toList()));
+
+    return resp;
+
+  }
+
+  private void checkSoapSignEnabled() {
+    if (!WebConfiguration.getSoapSignEnabled()) {
+      throw new WebServiceException("Service disabled!");
+    }
+  }
+
+  private PdfasSignRequest buildOperationRequest(PDFASSignRequest request) {
+    final PdfasSignRequest data = new PdfasSignRequest();
+    data.setRequestID(request.getRequestID());
+    data.setVerificationLevel(request.getVerificationLevel());
+
+    final CoreSignParams coreParams = new CoreSignParams();
+    coreParams.setSignatureBlockParameters(request.getSignatureBlockParameters());
+    coreParams.setConnector(request.getParameters().getConnector());
+    coreParams.setKeyIdentifier(request.getParameters().getKeyIdentifier());
+    coreParams.setOverrides(
+        request.getParameters().getOverrides() != null ? request.getParameters().getOverrides().getMap()
+            : null);
+    coreParams.setPreprocessor(
+        request.getParameters().getPreprocessor() != null ? request.getParameters().getPreprocessor().getMap()
+            : null);
+    coreParams.setInvokeErrorUrl(request.getParameters().getInvokeErrorURL());
+    coreParams.setInvokeTarget(request.getParameters().getInvokeTarget());
+    coreParams.setInvokeUrl(request.getParameters().getInvokeURL());
+    coreParams.setTransactionId(request.getParameters().getTransactionId());
+    data.setCoreParams(coreParams);
+
+    final DocumentToSign document = new DocumentToSign();
+    document.setInputData(request.getInputData());
+    document.setPosition(request.getParameters().getPosition());
+    document.setProfile(request.getParameters().getProfile());
+    document.setQrCodeContent(request.getParameters().getQRCodeContent());
+    data.addDocumentToSign(document);
+
+    return data;
+
+  }
+
+  private PDFASSignResponse buildResponseFromInternalResult(PdfasSignResponse internalResp, String reqId) {
+    final PDFASSignResponse resp = new PDFASSignResponse();
+    resp.setRequestID(reqId);
+    resp.setSignedPDF(internalResp.getSignedPdfs().get(0).getOutputData());
+    resp.setVerificationResponse(internalResp.getSignedPdfs().get(0).getVerificationResponse());
+    return resp;
+
+  }
+
+  @SneakyThrows
+  private void validatePdfSignature(SignedDocument el, PdfasSignRequest request,
+      StatisticEvent statisticEvent) {
+
+    Map<String, String> preProcessor = null;
+    if (request.getCoreParams().getPreprocessor() != null) {
+      preProcessor = request.getCoreParams().getPreprocessor();
+
+    }
+
+    VerifyResult verifyResult = null;
+    if (request.getVerificationLevel() != null &&
+        request.getVerificationLevel().equals(
+            VerificationLevel.FULL_CERT_PATH)) {
+      final List<VerifyResult> verResults = PdfAsHelper
+          .synchronousVerify(
+              el.getOutputData(),
+              -1,
+              SignatureVerificationLevel.FULL_VERIFICATION,
+              preProcessor);
+
+      if (verResults.size() < 1) {
+        throw new WebServiceException(
+            "Document verification failed! " + verResults.size());
+      }
+      verifyResult = verResults.get(verResults.size() - 1);
+    } else {
+      final List<VerifyResult> verResults = PdfAsHelper
+          .synchronousVerify(
+              el.getOutputData(),
+              -1,
+              SignatureVerificationLevel.INTEGRITY_ONLY_VERIFICATION,
+              preProcessor);
+
+      if (verResults.size() < 1) {
+        throw new WebServiceException(
+            "Document verification failed! " + verResults.size());
+      }
+
+      verifyResult = verResults.get(verResults.size() - 1);
+
+    }
+
+    if (verifyResult.getValueCheckCode().getCode() == 0) {
+      statisticEvent.setStatus(Status.OK);
+      statisticEvent.setEndNow();
+      statisticEvent.setTimestampNow();
+      statisticEvent.setFilesize(el.getOutputData().length);
+      StatisticFrontend.getInstance().storeEvent(statisticEvent);
+      statisticEvent.setLogged(true);
+    } else {
+      statisticEvent.setStatus(Status.ERROR);
+      statisticEvent.setErrorCode(verifyResult.getValueCheckCode().getCode());
+      statisticEvent.setEndNow();
+      statisticEvent.setTimestampNow();
+      statisticEvent.setFilesize(el.getOutputData().length);
+      StatisticFrontend.getInstance().storeEvent(statisticEvent);
+      statisticEvent.setLogged(true);
+    }
+
+    el.getVerificationResponse().setCertificateCode(
+        verifyResult.getCertificateCheck().getCode());
+    el.getVerificationResponse().setValueCode(
+        verifyResult.getValueCheckCode().getCode());
+
+  }
 }
diff --git a/pdf-as-web/src/main/resources/template_invoke_redirect_more_files.html b/pdf-as-web/src/main/resources/template_invoke_redirect_more_files.html
new file mode 100644
index 00000000..9ad17ea2
--- /dev/null
+++ b/pdf-as-web/src/main/resources/template_invoke_redirect_more_files.html
@@ -0,0 +1,56 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html lang="de">
+<head>
+<title></title>
+<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<style type="text/css">
+div.frameT {
+	width: 100%;
+	padding: 0;
+	display: table;
+	height: 100%;
+	position: absolute;
+	top: 0;
+	left: 0;
+	margin: 0;
+}
+
+div.frameTC {
+	padding: 0;
+	vertical-align: middle;
+	display: table-cell;
+	margin: 0;
+}
+
+div.content {
+	width: 600px;
+	background-color: #fff;
+	margin: 0 auto;
+	text-align: left;
+	padding: 10px;
+}
+</style>
+<script language="javascript" type="text/javascript">
+                        function onAnmeldeSubmit() {
+                                document.CustomizedForm.submit();
+                                document.CustomizedForm.Senden.disabled=true;
+                                document.CustomizedForm.Senden.hidden = "hidden";
+                        }
+                </script>
+</head>
+<body onload="onAnmeldeSubmit()">
+	<div class="frameT">
+		<div class="frameTC">
+			<div class="content">
+				<form name="CustomizedForm" action="##INVOKE_URL##" method="GET" target="##TARGET##">
+					<input type="submit" value="Weiter"
+						name="Senden"> 
+						##ADD_PARAMS##
+						<input type="hidden" name="token" value="##RESPONSETOKEN##"> 
+				</form>
+			</div>
+		</div>
+	</div>
+	
+</body>
+</html>