PDF-AS Web Signature Block Preview Service

2 files changed, 122 insertions, 0 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 85a36e17..041c7df3 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
@@ -23,13 +23,21 @@
  ******************************************************************************/
 package at.gv.egiz.pdfas.web.helper;
 
+import iaik.x509.X509Certificate;
+
+import java.awt.Image;
+import java.awt.image.RenderedImage;
+import java.io.ByteArrayOutputStream;
 import java.io.File;
+import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.UnsupportedEncodingException;
 import java.net.URLEncoder;
+import java.security.cert.CertificateException;
 import java.util.Iterator;
 import java.util.List;
 
+import javax.imageio.ImageIO;
 import javax.servlet.RequestDispatcher;
 import javax.servlet.ServletContext;
 import javax.servlet.ServletException;
@@ -45,6 +53,7 @@ import org.slf4j.LoggerFactory;
 
 import at.gv.egiz.pdfas.api.ws.PDFASSignParameters;
 import at.gv.egiz.pdfas.api.ws.PDFASSignParameters.Connector;
+import at.gv.egiz.pdfas.common.exceptions.PdfAsException;
 import at.gv.egiz.pdfas.lib.api.ByteArrayDataSink;
 import at.gv.egiz.pdfas.lib.api.ByteArrayDataSource;
 import at.gv.egiz.pdfas.lib.api.Configuration;
@@ -468,6 +477,25 @@ public class PdfAsHelper {
 		return data;
 	}
 
+	public static byte[] generateVisualBlock(String profile, int resolution) throws IOException, CertificateException, PdfAsException {
+		X509Certificate cert = new X509Certificate(PdfAsHelper.class.getResourceAsStream("/qualified.cer"));
+		Configuration config = pdfAs.getConfiguration();
+		SignParameter parameter = PdfAsFactory.createSignParameter(
+				config, null);
+		parameter.setSignatureProfileId(profile);
+		Image img = pdfAs.generateVisibleSignaturePreview(parameter,
+				cert, resolution);
+		
+		if(img == null) {
+			return null;
+		}
+		
+		ByteArrayOutputStream baos = new ByteArrayOutputStream();
+		ImageIO.write((RenderedImage) img, "png", baos);
+		baos.close();
+		return baos.toByteArray();
+	}
+	
 	public static void injectCertificate(HttpServletRequest request,
 			HttpServletResponse response,
 			InfoboxReadResponseType infoboxReadResponseType,
diff --git a/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/servlets/VisBlockServlet.java b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/servlets/VisBlockServlet.java
new file mode 100644
index 00000000..3008c25e
--- /dev/null
+++ b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/servlets/VisBlockServlet.java
@@ -0,0 +1,94 @@
+package at.gv.egiz.pdfas.web.servlets;
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.security.cert.CertificateException;
+
+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.common.exceptions.PdfAsException;
+import at.gv.egiz.pdfas.web.helper.PdfAsHelper;
+
+public class VisBlockServlet extends HttpServlet {
+
+	private static final long serialVersionUID = 1L;
+
+	private static final Logger logger = LoggerFactory
+			.getLogger(VisBlockServlet.class);
+
+	private static String PARAM_PROFILE = "p";
+	private static String PARAM_RESOLUTION = "r";
+
+	/**
+	 * @see HttpServlet#HttpServlet()
+	 */
+	public VisBlockServlet() {
+		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 {
+
+		try {
+
+			String profile = request.getParameter(PARAM_PROFILE);
+			String resolutionString = request.getParameter(PARAM_RESOLUTION);
+
+			int resolution = Integer.parseInt(resolutionString);
+
+			if (resolution < 16 || resolution > 512) {
+				throw new ServletException(PARAM_RESOLUTION
+						+ " invalid value! Out of Range");
+			}
+
+			byte[] imageData = PdfAsHelper.generateVisualBlock(profile, resolution);
+			
+			if (imageData != null) {
+				
+				response.setHeader("Content-Disposition", "inline;filename="
+						+ profile + "_" + resolution + ".png");
+				response.setContentType("image/png");
+				OutputStream os = response.getOutputStream();
+				os.write(imageData);
+				os.close();
+			} else {
+				logger.warn("generateVisualBlock returned null!");
+				throw new ServletException("Invalid profile id");
+			}
+		} catch (NumberFormatException e) {
+			throw new ServletException(PARAM_RESOLUTION
+					+ " invalid value! Not a Number");
+		} catch (CertificateException e) {
+			logger.error("CERT Error", e);
+			throw new ServletException("Failed to find certificate");
+		} catch (PdfAsException e) {
+			logger.error("PDF_AS Error", e);
+			throw new ServletException("Generic Error");
+		} 
+	}
+
+}