git-svn-id: https://joinup.ec.europa.eu/svn/pdf-as/trunk@95 7b5415b0-85f9-ee4d-85bd-d5d0c3b42d1c

1 files changed, 35 insertions, 0 deletions

diff --git a/src/main/java/at/knowcenter/wag/egov/egiz/framework/VerificationFilter.java b/src/main/java/at/knowcenter/wag/egov/egiz/framework/VerificationFilter.java
index 26f46e8..be375ec 100644
--- a/src/main/java/at/knowcenter/wag/egov/egiz/framework/VerificationFilter.java
+++ b/src/main/java/at/knowcenter/wag/egov/egiz/framework/VerificationFilter.java
@@ -52,6 +52,7 @@ import at.knowcenter.wag.exactparser.parsing.results.FooterParseResult;
 import at.knowcenter.wag.exactparser.parsing.results.IndirectObjectReferenceParseResult;

 import at.knowcenter.wag.exactparser.parsing.results.NumberParseResult;

 import at.knowcenter.wag.exactparser.parsing.results.ObjectParseResult;

+import at.knowcenter.wag.egov.egiz.cfg.SettingsReader;

 

 

 /**

@@ -72,6 +73,9 @@ public class VerificationFilter
       'g', 'D', 'i', 'c', 't' };

 

   public static final byte[] EGIZ_KZ_NAME = { 'I', 'D' };

+  

+  //tzefferer: flag for accepting post-sign modifications

+  public static final String ALLOW_POST_SIGN_MODIFICATIONS = "allow_post_sign_modifications";

 

   /**

    * The logger definition.

@@ -98,6 +102,11 @@ public class VerificationFilter
    */

   public List extractSignaturesFromPdf(final byte[] pdf) throws PresentableException

   {

+    

+    // tzefferer: get allow_post_sign_modifications property from property file

+    SettingsReader settings = SettingsReader.getInstance();

+    String allow_post_sign_mods = settings.getSetting(ALLOW_POST_SIGN_MODIFICATIONS, "false");

+    

     List holders = new ArrayList();

 

     List blocks = null;

@@ -119,9 +128,12 @@ public class VerificationFilter
 //    }

 

     unrollLinearization(blocks);

+    

+    boolean signature_block_detected = false;

 

     for (int i = 0; i < blocks.size(); i++)

     {

+      boolean current_block_contains_signature = false;

       FooterParseResult bpr = (FooterParseResult) blocks.get(i);

 

       int prev_end = 0;

@@ -149,6 +161,13 @@ public class VerificationFilter
         List binary_holders = verificator.parseBlock(pdf, bpr, prev_end);

 

         holders.addAll(binary_holders);

+        

+        // tzefferer: check if signatures have been detected in current block        

+        if(binary_holders.size() > 0)

+        {

+          signature_block_detected = true;

+          current_block_contains_signature = true;

+        }

 

         logger_.debug(":Parsing Binary Sig END - holders.size = " + holders.size());

       }

@@ -160,6 +179,13 @@ public class VerificationFilter
         List text_holders = verificator.parseBlock(pdf, bpr, prev_end);

         logger_.debug("text_holders = " + text_holders.size());

 

+        // tzefferer: check if signatures have been detected in current block

+        if(text_holders.size() > 0)

+        {

+          signature_block_detected = true;

+          current_block_contains_signature = true;

+        }

+        

         if (prev_end == 0)

         {

           String rest_text = null;

@@ -191,6 +217,15 @@ public class VerificationFilter
 

         logger_.debug(":Extracting tex END - holders.size = " + holders.size());

       }

+      

+      // tzefferer: check if illegal modifications have been performed on the document after performing a signation

+      if(allow_post_sign_mods.equals("false"))

+      {

+        if((signature_block_detected == true) && (current_block_contains_signature == false))

+        {

+          throw new PDFDocumentException(316, "Das Dokument wurde nach erfolgter Signierung verändert.");

+        }

+      }

     }

 

     for (int i = 0; i < holders.size(); i++)