aboutsummaryrefslogtreecommitdiff
path: root/pdf-as-lib/src/main/java/at/gv/egiz
diff options
context:
space:
mode:
authorAndreas Fitzek <andreas.fitzek@iaik.tugraz.at>2014-10-30 17:15:54 +0100
committerAndreas Fitzek <andreas.fitzek@iaik.tugraz.at>2014-10-30 17:15:54 +0100
commitfb3344c1e4d4ac8e8a6aa5605d052cee8cd4c3b1 (patch)
tree01e04f2f9e9286c02bbc55699d027150180bbe01 /pdf-as-lib/src/main/java/at/gv/egiz
parente123b037e65b336c677c0a66125ae85f5827417a (diff)
downloadpdf-as-4-fb3344c1e4d4ac8e8a6aa5605d052cee8cd4c3b1.tar.gz
pdf-as-4-fb3344c1e4d4ac8e8a6aa5605d052cee8cd4c3b1.tar.bz2
pdf-as-4-fb3344c1e4d4ac8e8a6aa5605d052cee8cd4c3b1.zip
Introduced Process Information Map in PDFASError and SignResult
Diffstat (limited to 'pdf-as-lib/src/main/java/at/gv/egiz')
-rw-r--r--pdf-as-lib/src/main/java/at/gv/egiz/pdfas/lib/api/sign/SignResult.java3
-rw-r--r--pdf-as-lib/src/main/java/at/gv/egiz/pdfas/lib/impl/ErrorExtractor.java21
-rw-r--r--pdf-as-lib/src/main/java/at/gv/egiz/pdfas/lib/impl/PdfAsImpl.java20
-rw-r--r--pdf-as-lib/src/main/java/at/gv/egiz/pdfas/lib/impl/SignResultImpl.java8
-rw-r--r--pdf-as-lib/src/main/java/at/gv/egiz/pdfas/lib/impl/status/OperationStatus.java5
-rw-r--r--pdf-as-lib/src/main/java/at/gv/egiz/pdfas/lib/impl/status/RequestedSignature.java7
-rw-r--r--pdf-as-lib/src/main/java/at/gv/egiz/pdfas/lib/util/SignatureUtils.java4
-rw-r--r--pdf-as-lib/src/main/java/at/gv/egiz/sl/util/BKUHeader.java32
-rw-r--r--pdf-as-lib/src/main/java/at/gv/egiz/sl/util/BKUSLConnector.java47
-rw-r--r--pdf-as-lib/src/main/java/at/gv/egiz/sl/util/ISignatureConnectorSLWrapper.java48
-rw-r--r--pdf-as-lib/src/main/java/at/gv/egiz/sl/util/RequestPackage.java9
11 files changed, 158 insertions, 46 deletions
diff --git a/pdf-as-lib/src/main/java/at/gv/egiz/pdfas/lib/api/sign/SignResult.java b/pdf-as-lib/src/main/java/at/gv/egiz/pdfas/lib/api/sign/SignResult.java
index 8084f8f1..d2dc896e 100644
--- a/pdf-as-lib/src/main/java/at/gv/egiz/pdfas/lib/api/sign/SignResult.java
+++ b/pdf-as-lib/src/main/java/at/gv/egiz/pdfas/lib/api/sign/SignResult.java
@@ -24,6 +24,7 @@
package at.gv.egiz.pdfas.lib.api.sign;
import java.security.cert.X509Certificate;
+import java.util.Map;
import at.gv.egiz.pdfas.lib.api.SignaturePosition;
@@ -52,4 +53,6 @@ public interface SignResult {
* return null if no position information is available.
*/
public SignaturePosition getSignaturePosition();
+
+ public Map<String, String> getProcessInformations();
}
diff --git a/pdf-as-lib/src/main/java/at/gv/egiz/pdfas/lib/impl/ErrorExtractor.java b/pdf-as-lib/src/main/java/at/gv/egiz/pdfas/lib/impl/ErrorExtractor.java
index 6708fc5b..9b2a8d79 100644
--- a/pdf-as-lib/src/main/java/at/gv/egiz/pdfas/lib/impl/ErrorExtractor.java
+++ b/pdf-as-lib/src/main/java/at/gv/egiz/pdfas/lib/impl/ErrorExtractor.java
@@ -7,6 +7,7 @@ import at.gv.egiz.pdfas.common.exceptions.ErrorConstants;
import at.gv.egiz.pdfas.common.exceptions.PDFASError;
import at.gv.egiz.pdfas.common.exceptions.PdfAsMOAException;
import at.gv.egiz.pdfas.common.exceptions.SLPdfAsException;
+import at.gv.egiz.pdfas.lib.impl.status.OperationStatus;
public class ErrorExtractor implements ErrorConstants {
@@ -48,7 +49,7 @@ public class ErrorExtractor implements ErrorConstants {
return null;
}
- public static PDFASError searchPdfAsError(Throwable e) {
+ public static PDFASError searchPdfAsError(Throwable e, OperationStatus status) {
Throwable cur = e;
PDFASError err = null;
@@ -68,6 +69,11 @@ public class ErrorExtractor implements ErrorConstants {
}
if(err != null) {
+
+ if(status != null) {
+ err.getProcessInformations().putAll(status.getMetaInformations());
+ }
+
return err;
}
@@ -89,11 +95,22 @@ public class ErrorExtractor implements ErrorConstants {
}
if (err != null) {
+
+ if(status != null) {
+ err.getProcessInformations().putAll(status.getMetaInformations());
+ }
+
return err;
}
logger.info("Cannot extract correct failure code from: ", e);
- return new PDFASError(ERROR_GENERIC, e);
+ err = new PDFASError(ERROR_GENERIC, e);
+
+ if(status != null) {
+ err.getProcessInformations().putAll(status.getMetaInformations());
+ }
+
+ return err;
}
}
diff --git a/pdf-as-lib/src/main/java/at/gv/egiz/pdfas/lib/impl/PdfAsImpl.java b/pdf-as-lib/src/main/java/at/gv/egiz/pdfas/lib/impl/PdfAsImpl.java
index 4828bae3..aa524cc9 100644
--- a/pdf-as-lib/src/main/java/at/gv/egiz/pdfas/lib/impl/PdfAsImpl.java
+++ b/pdf-as-lib/src/main/java/at/gv/egiz/pdfas/lib/impl/PdfAsImpl.java
@@ -190,7 +190,7 @@ public class PdfAsImpl implements PdfAs, IConfigurationConstants,
} catch (Throwable e) {
logger.error("Failed to create signature [" + e.getMessage() + "]",
e);
- throw ErrorExtractor.searchPdfAsError(e);
+ throw ErrorExtractor.searchPdfAsError(e, status);
} finally {
if (status != null) {
status.clear();
@@ -217,7 +217,7 @@ public class PdfAsImpl implements PdfAs, IConfigurationConstants,
try {
return backend.getVerifier().verify(parameter);
} catch (Throwable e) {
- throw ErrorExtractor.searchPdfAsError(e);
+ throw ErrorExtractor.searchPdfAsError(e, null);
}
}
@@ -230,7 +230,7 @@ public class PdfAsImpl implements PdfAs, IConfigurationConstants,
verifySignParameter(parameter);
StatusRequestImpl request = new StatusRequestImpl();
-
+ OperationStatus status = null;
try {
// Status initialization
if (!(parameter.getConfiguration() instanceof ISettings)) {
@@ -248,7 +248,7 @@ public class PdfAsImpl implements PdfAs, IConfigurationConstants,
}
ISettings settings = (ISettings) parameter.getConfiguration();
- OperationStatus status = new OperationStatus(settings, parameter,
+ status = new OperationStatus(settings, parameter,
backend);
IPdfSigner signer = backend.getPdfSigner();
@@ -267,7 +267,7 @@ public class PdfAsImpl implements PdfAs, IConfigurationConstants,
return request;
} catch (Throwable e) {
logger.error("startSign", e);
- throw ErrorExtractor.searchPdfAsError(e);
+ throw ErrorExtractor.searchPdfAsError(e, status);
}
}
@@ -329,7 +329,7 @@ public class PdfAsImpl implements PdfAs, IConfigurationConstants,
} catch (Throwable e) {
logger.error("process", e);
- throw ErrorExtractor.searchPdfAsError(e);
+ throw ErrorExtractor.searchPdfAsError(e, status);
}
} else if (request.needSignature()) {
request.setNeedSignature(false);
@@ -379,7 +379,7 @@ public class PdfAsImpl implements PdfAs, IConfigurationConstants,
return createSignResult(status);
} catch (IOException e) {
// new PdfAsException("error.pdf.sig.06", e);
- throw ErrorExtractor.searchPdfAsError(e);
+ throw ErrorExtractor.searchPdfAsError(e, status);
} finally {
if (status != null) {
status.clear();
@@ -456,7 +456,7 @@ public class PdfAsImpl implements PdfAs, IConfigurationConstants,
.getCertificate());
result.setSignaturePosition(status.getRequestedSignature()
.getSignaturePosition());
-
+ result.getProcessInformations().putAll(status.getMetaInformations());
return result;
}
@@ -499,10 +499,10 @@ public class PdfAsImpl implements PdfAs, IConfigurationConstants,
resolution, status, requestedSignature);
} catch (PdfAsException e) {
logger.error("PDF-AS Exception", e);
- throw ErrorExtractor.searchPdfAsError(e);
+ throw ErrorExtractor.searchPdfAsError(e, status);
} catch (Throwable e) {
logger.error("Throwable Exception", e);
- throw ErrorExtractor.searchPdfAsError(e);
+ throw ErrorExtractor.searchPdfAsError(e, status);
}
}
diff --git a/pdf-as-lib/src/main/java/at/gv/egiz/pdfas/lib/impl/SignResultImpl.java b/pdf-as-lib/src/main/java/at/gv/egiz/pdfas/lib/impl/SignResultImpl.java
index f713eb6a..44992c2b 100644
--- a/pdf-as-lib/src/main/java/at/gv/egiz/pdfas/lib/impl/SignResultImpl.java
+++ b/pdf-as-lib/src/main/java/at/gv/egiz/pdfas/lib/impl/SignResultImpl.java
@@ -24,6 +24,8 @@
package at.gv.egiz.pdfas.lib.impl;
import java.security.cert.X509Certificate;
+import java.util.HashMap;
+import java.util.Map;
import at.gv.egiz.pdfas.lib.api.SignaturePosition;
import at.gv.egiz.pdfas.lib.api.sign.SignResult;
@@ -32,6 +34,7 @@ public class SignResultImpl implements SignResult {
protected X509Certificate certificate;
protected SignaturePosition position;
+ protected Map<String, String> processInfo = new HashMap<String, String>();
public SignResultImpl() {
}
@@ -52,4 +55,9 @@ public class SignResultImpl implements SignResult {
this.position = position;
}
+ @Override
+ public Map<String, String> getProcessInformations() {
+ return processInfo;
+ }
+
}
diff --git a/pdf-as-lib/src/main/java/at/gv/egiz/pdfas/lib/impl/status/OperationStatus.java b/pdf-as-lib/src/main/java/at/gv/egiz/pdfas/lib/impl/status/OperationStatus.java
index 7b2ce69c..ecdddfa1 100644
--- a/pdf-as-lib/src/main/java/at/gv/egiz/pdfas/lib/impl/status/OperationStatus.java
+++ b/pdf-as-lib/src/main/java/at/gv/egiz/pdfas/lib/impl/status/OperationStatus.java
@@ -54,6 +54,7 @@ public class OperationStatus implements Serializable {
private RequestedSignature requestedSignature;
private Calendar signingDate;
private PDFASBackend backend;
+ private Map<String, String> metaInformations = new HashMap<String, String>();
public OperationStatus(ISettings configuration, SignParameter signParameter, PDFASBackend backend) {
this.configuration = configuration;
@@ -169,4 +170,8 @@ public class OperationStatus implements Serializable {
}
return null;
}
+
+ public Map<String, String> getMetaInformations() {
+ return metaInformations;
+ }
}
diff --git a/pdf-as-lib/src/main/java/at/gv/egiz/pdfas/lib/impl/status/RequestedSignature.java b/pdf-as-lib/src/main/java/at/gv/egiz/pdfas/lib/impl/status/RequestedSignature.java
index c9cab906..8226d7e9 100644
--- a/pdf-as-lib/src/main/java/at/gv/egiz/pdfas/lib/impl/status/RequestedSignature.java
+++ b/pdf-as-lib/src/main/java/at/gv/egiz/pdfas/lib/impl/status/RequestedSignature.java
@@ -92,7 +92,8 @@ public class RequestedSignature implements ICertificateProvider {
public void setSignaturePosition(SignaturePosition signaturePosition) {
this.signaturePosition = signaturePosition;
}
-
-
-
+
+ public OperationStatus getStatus() {
+ return status;
+ }
}
diff --git a/pdf-as-lib/src/main/java/at/gv/egiz/pdfas/lib/util/SignatureUtils.java b/pdf-as-lib/src/main/java/at/gv/egiz/pdfas/lib/util/SignatureUtils.java
index cdc7f11e..14dbdd16 100644
--- a/pdf-as-lib/src/main/java/at/gv/egiz/pdfas/lib/util/SignatureUtils.java
+++ b/pdf-as-lib/src/main/java/at/gv/egiz/pdfas/lib/util/SignatureUtils.java
@@ -46,14 +46,14 @@ public class SignatureUtils implements ErrorConstants {
VerifyResultImpl verifyResult = new VerifyResultImpl();
//results.add(verifyResult);
try {
- logger.info("Signature Algo: {}, Digest {}", signedData
+ logger.debug("Signature Algo: {}, Digest {}", signedData
.getSignerInfos()[0].getSignatureAlgorithm(),
signedData.getSignerInfos()[0].getDigestAlgorithm());
// verify the signature for SignerInfo at index i
X509Certificate signer_cert = signedData.verify(0);
// if the signature is OK the certificate of the
// signer is returned
- logger.info("Signature OK from signer: "
+ logger.debug("Signature OK from signer: "
+ signer_cert.getSubjectDN());
verifyResult.setSignerCertificate(signer_cert);
diff --git a/pdf-as-lib/src/main/java/at/gv/egiz/sl/util/BKUHeader.java b/pdf-as-lib/src/main/java/at/gv/egiz/sl/util/BKUHeader.java
new file mode 100644
index 00000000..7733e78a
--- /dev/null
+++ b/pdf-as-lib/src/main/java/at/gv/egiz/sl/util/BKUHeader.java
@@ -0,0 +1,32 @@
+package at.gv.egiz.sl.util;
+
+public class BKUHeader {
+ private String name;
+ private String value;
+
+ public BKUHeader(String name, String value) {
+ this.name = name;
+ this.value = value;
+ }
+
+ public String getName() {
+ return name;
+ }
+
+ public void setName(String name) {
+ this.name = name;
+ }
+
+ public String getValue() {
+ return value;
+ }
+
+ public void setValue(String value) {
+ this.value = value;
+ }
+
+ @Override
+ public String toString() {
+ return getName() + " = " + getValue();
+ }
+}
diff --git a/pdf-as-lib/src/main/java/at/gv/egiz/sl/util/BKUSLConnector.java b/pdf-as-lib/src/main/java/at/gv/egiz/sl/util/BKUSLConnector.java
index 8907711a..e1c7bf40 100644
--- a/pdf-as-lib/src/main/java/at/gv/egiz/sl/util/BKUSLConnector.java
+++ b/pdf-as-lib/src/main/java/at/gv/egiz/sl/util/BKUSLConnector.java
@@ -31,6 +31,7 @@ import java.nio.charset.Charset;
import javax.xml.bind.JAXBElement;
import javax.xml.bind.JAXBException;
+import org.apache.http.Header;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpPost;
@@ -69,7 +70,8 @@ public class BKUSLConnector extends BaseSLConnector {
return builder.build();
}
- private String performHttpRequestToBKU(String xmlRequest, RequestPackage pack, SignParameter parameter)
+ private String performHttpRequestToBKU(String xmlRequest,
+ RequestPackage pack, SignParameter parameter)
throws ClientProtocolException, IOException, IllegalStateException {
CloseableHttpClient client = null;
try {
@@ -82,16 +84,17 @@ public class BKUSLConnector extends BaseSLConnector {
entityBuilder.addTextBody(XMLREQUEST, xmlRequest,
ContentType.TEXT_XML);
- if(parameter != null) {
+ if (parameter != null) {
String transactionId = parameter.getTransactionId();
- if(transactionId != null) {
+ if (transactionId != null) {
entityBuilder.addTextBody("TransactionId_", transactionId);
}
}
-
- if(pack != null && pack.getSignatureData() != null) {
- entityBuilder.addBinaryBody("fileupload",
- PDFUtils.blackOutSignature(pack.getSignatureData(), pack.getByteRange()));
+
+ if (pack != null && pack.getSignatureData() != null) {
+ entityBuilder.addBinaryBody("fileupload", PDFUtils
+ .blackOutSignature(pack.getSignatureData(),
+ pack.getByteRange()));
}
post.setEntity(entityBuilder.build());
@@ -99,6 +102,19 @@ public class BKUSLConnector extends BaseSLConnector {
logger.debug("Response Code : "
+ response.getStatusLine().getStatusCode());
+ if(pack != null) {
+ Header[] headers = response.getAllHeaders();
+
+ if (headers != null) {
+ for (int i = 0; i < headers.length; i++) {
+ BKUHeader hdr = new BKUHeader(headers[i].getName(), headers[i].getValue());
+ logger.debug("Response Header : {}",
+ hdr.toString());
+ pack.getHeaders().add(hdr);
+ }
+ }
+ }
+
BufferedReader rd = new BufferedReader(new InputStreamReader(
response.getEntity().getContent()));
@@ -110,20 +126,21 @@ public class BKUSLConnector extends BaseSLConnector {
rd.close();
response = null;
rd = null;
-
+
logger.trace(result.toString());
return result.toString();
} catch (PDFIOException e) {
throw new PdfAsWrappedIOException(e);
} finally {
- if(client != null) {
+ if (client != null) {
client.close();
}
}
}
public InfoboxReadResponseType sendInfoboxReadRequest(
- InfoboxReadRequestType request, SignParameter parameter) throws PdfAsException {
+ InfoboxReadRequestType request, SignParameter parameter)
+ throws PdfAsException {
JAXBElement<?> element = null;
String slRequest;
try {
@@ -131,7 +148,8 @@ public class BKUSLConnector extends BaseSLConnector {
.createInfoboxReadRequest(request));
logger.trace(slRequest);
- String slResponse = performHttpRequestToBKU(slRequest, null, parameter);
+ String slResponse = performHttpRequestToBKU(slRequest, null,
+ parameter);
element = (JAXBElement<?>) SLMarschaller
.unmarshalFromString(slResponse);
@@ -161,8 +179,8 @@ public class BKUSLConnector extends BaseSLConnector {
throw new PdfAsException("error.pdf.io.03");
}
- public CreateCMSSignatureResponseType sendCMSRequest(
- RequestPackage pack, SignParameter parameter) throws PdfAsException {
+ public CreateCMSSignatureResponseType sendCMSRequest(RequestPackage pack,
+ SignParameter parameter) throws PdfAsException {
JAXBElement<?> element = null;
String slRequest;
try {
@@ -170,7 +188,8 @@ public class BKUSLConnector extends BaseSLConnector {
.createCreateCMSSignatureRequest(pack.getRequestType()));
logger.debug(slRequest);
- String slResponse = performHttpRequestToBKU(slRequest, pack, parameter);
+ String slResponse = performHttpRequestToBKU(slRequest, pack,
+ parameter);
element = (JAXBElement<?>) SLMarschaller
.unmarshalFromString(slResponse);
diff --git a/pdf-as-lib/src/main/java/at/gv/egiz/sl/util/ISignatureConnectorSLWrapper.java b/pdf-as-lib/src/main/java/at/gv/egiz/sl/util/ISignatureConnectorSLWrapper.java
index 19dc3d76..49a450af 100644
--- a/pdf-as-lib/src/main/java/at/gv/egiz/sl/util/ISignatureConnectorSLWrapper.java
+++ b/pdf-as-lib/src/main/java/at/gv/egiz/sl/util/ISignatureConnectorSLWrapper.java
@@ -31,6 +31,7 @@ import java.util.Iterator;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
+import at.gv.egiz.pdfas.common.exceptions.ErrorConstants;
import at.gv.egiz.pdfas.common.exceptions.PDFASError;
import at.gv.egiz.pdfas.common.exceptions.PdfAsErrorCarrier;
import at.gv.egiz.pdfas.common.exceptions.PdfAsException;
@@ -48,7 +49,9 @@ import at.gv.egiz.sl.schema.InfoboxReadResponseType;
public class ISignatureConnectorSLWrapper implements ISignatureConnector {
public static final String SL_USE_BASE64 = "";
-
+
+ public static final String SIGNATURE_DEVICE = "BKU";
+
private static final Logger logger = LoggerFactory
.getLogger(ISignatureConnectorSLWrapper.class);
@@ -58,7 +61,8 @@ public class ISignatureConnectorSLWrapper implements ISignatureConnector {
this.connector = connector;
}
- public X509Certificate getCertificate(SignParameter parameter) throws PdfAsException {
+ public X509Certificate getCertificate(SignParameter parameter)
+ throws PdfAsException {
X509Certificate certificate = null;
try {
InfoboxReadRequestType request = connector
@@ -83,25 +87,43 @@ public class ISignatureConnectorSLWrapper implements ISignatureConnector {
return certificate;
}
- public byte[] sign(byte[] input, int[] byteRange,
- SignParameter parameter, RequestedSignature requestedSignature) throws PdfAsException {
- RequestPackage pack = connector.createCMSRequest(
- input, byteRange, parameter);
- CreateCMSSignatureResponseType response = connector
- .sendCMSRequest(pack, parameter);
-
+ public byte[] sign(byte[] input, int[] byteRange, SignParameter parameter,
+ RequestedSignature requestedSignature) throws PdfAsException {
+ RequestPackage pack = connector.createCMSRequest(input, byteRange,
+ parameter);
+ CreateCMSSignatureResponseType response = connector.sendCMSRequest(
+ pack, parameter);
+
+ Iterator<BKUHeader> bkuHeaderIt = pack.getHeaders().iterator();
+
+ requestedSignature.getStatus().getMetaInformations()
+ .put(ErrorConstants.STATUS_INFO_SIGDEVICE, SIGNATURE_DEVICE);
+ while (bkuHeaderIt.hasNext()) {
+ BKUHeader header = bkuHeaderIt.next();
+ if ("Server".equalsIgnoreCase(header.getName())) {
+ requestedSignature
+ .getStatus()
+ .getMetaInformations()
+ .put(ErrorConstants.STATUS_INFO_SIGDEVICEVERSION,
+ header.getValue());
+ break;
+ }
+ }
+
VerifyResult verifyResult;
try {
- verifyResult = SignatureUtils.verifySignature(response.getCMSSignature(), input);
+ verifyResult = SignatureUtils.verifySignature(
+ response.getCMSSignature(), input);
} catch (PDFASError e) {
throw new PdfAsErrorCarrier(e);
}
- if(!StreamUtils.dataCompare(requestedSignature.getCertificate().getFingerprintSHA(),
- ((X509Certificate)verifyResult.getSignerCertificate()).getFingerprintSHA())) {
+ if (!StreamUtils.dataCompare(requestedSignature.getCertificate()
+ .getFingerprintSHA(), ((X509Certificate) verifyResult
+ .getSignerCertificate()).getFingerprintSHA())) {
throw new PdfAsSignatureException("Certificates missmatch!");
}
-
+
return response.getCMSSignature();
}
diff --git a/pdf-as-lib/src/main/java/at/gv/egiz/sl/util/RequestPackage.java b/pdf-as-lib/src/main/java/at/gv/egiz/sl/util/RequestPackage.java
index fccd800d..f08184d2 100644
--- a/pdf-as-lib/src/main/java/at/gv/egiz/sl/util/RequestPackage.java
+++ b/pdf-as-lib/src/main/java/at/gv/egiz/sl/util/RequestPackage.java
@@ -23,12 +23,16 @@
******************************************************************************/
package at.gv.egiz.sl.util;
+import java.util.ArrayList;
+import java.util.List;
+
import at.gv.egiz.sl.schema.CreateCMSSignatureRequestType;
public class RequestPackage {
private CreateCMSSignatureRequestType requestType;
private byte[] signatureData;
private int[] byteRange;
+ private List<BKUHeader> headers = new ArrayList<BKUHeader>();
public CreateCMSSignatureRequestType getRequestType() {
return requestType;
@@ -48,6 +52,7 @@ public class RequestPackage {
public void setByteRange(int[] byteRange) {
this.byteRange = byteRange;
}
-
-
+ public List<BKUHeader> getHeaders() {
+ return headers;
+ }
}