From e4c22a05b08be72a0117b30fd89e5db5b5d7cf50 Mon Sep 17 00:00:00 2001
From: tknall <tknall@7b5415b0-85f9-ee4d-85bd-d5d0c3b42d1c>
Date: Tue, 22 May 2007 15:03:19 +0000
Subject: git-svn-id: https://joinup.ec.europa.eu/svn/pdf-as/trunk@95
 7b5415b0-85f9-ee4d-85bd-d5d0c3b42d1c

---
 .../egov/egiz/framework/VerificationFilter.java    | 35 ++++++++++++++++++++++
 1 file changed, 35 insertions(+)

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++)
-- 
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