[BATIK-1227] [PATCH] Image filters encoded with Base64 in the SVG throw "Content not allowed in prolog" exception

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 1.9
• Component/s: Bridge
• Flags: Patch
• Assignee: Unassigned
• Reporter: Dan Caprioara
• Created: 30/May/18 13:09
• Updated: 01/Apr/23 08:53

Description

Having this SVG:

<svg id="note" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="20" height="20" viewBox="0 0 20 20">
  <defs>
    <style>
      .cls-1 {
        fill: #e99915;
        filter: url(#filter);
      }

      .cls-1, .cls-2, .cls-3, .cls-4, .cls-5 {
        fill-rule: evenodd;
      }

      .cls-2 {
        fill: #cbcbcb;
        filter: url(#filter-2);
      }

      .cls-3 {
        fill: red;
        filter: url(#filter-3);
      }

      .cls-4 {
        fill: #b04a1a;
      }

      .cls-5 {
        fill: #cd803c;
      }
    </style>
    <filter id="filter" x="2" y="2" width="16" height="16" filterUnits="userSpaceOnUse">
      <feImage preserveAspectRatio="none" x="2" y="2" width="16" height="16" result="image" xlink:href="data:image/svg+xml;base64,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"/>
      <feComposite result="composite" operator="in" in2="SourceGraphic"/>
      <feBlend result="blend" in2="SourceGraphic"/>
    </filter>
    <filter id="filter-2" x="3" y="3" width="14" height="14" filterUnits="userSpaceOnUse">
      <feImage preserveAspectRatio="none" x="3" y="3" width="14" height="14" result="image" xlink:href="data:image/svg+xml;base64,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"/>
      <feComposite result="composite" operator="in" in2="SourceGraphic"/>
      <feBlend result="blend" in2="SourceGraphic"/>
    </filter>
    <filter id="filter-3" x="12" y="12" width="6" height="6" filterUnits="userSpaceOnUse">
      <feImage preserveAspectRatio="none" x="12" y="12" width="6" height="6" result="image" xlink:href="data:image/svg+xml;base64,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"/>
      <feComposite result="composite" operator="in" in2="SourceGraphic"/>
      <feBlend result="blend" in2="SourceGraphic"/>
    </filter>
  </defs>
  <path id="Outer" class="cls-1" d="M2,2H18V12.719L12.563,18H2V2Z"/>
  <path id="Fill" class="cls-2" d="M3,3H17v9.719L12.563,17H3V3Z"/>
  <path id="FillCorner" class="cls-3" d="M13.031,13v3L12,18l6-6-2,1H13.031Z"/>
  <path id="Lines" class="cls-4" d="M6,7V6h8V7H6Zm0,3V9h8v1H6Zm0,3V12h4v1H6Z"/>
  <path id="Corner" class="cls-5" d="M18,12v0.707L17.707,13,13,17.707,12.707,18H12V12h6Zm-5,1v3.293L16.293,13H13Z"/>
</svg>

You get:

ERROR org.apache.fop.apps.FOUserAgent - SVG graphic could not be built. Reason: org.apache.batik.bridge.BridgeException: Content is not allowed in prolog.
[exec] org.apache.batik.bridge.BridgeException: Content is not allowed in prolog.
[exec] at org.apache.batik.bridge.BridgeContext.getReferencedNode(BridgeContext.java:788)
[exec] at org.apache.batik.bridge.BridgeContext.getReferencedElement(BridgeContext.java:804)
[exec] at org.apache.batik.bridge.PaintServer.convertURIPaint(PaintServer.java:365)
[exec] at org.apache.batik.bridge.PaintServer.convertPaint(PaintServer.java:273)
[exec] at org.apache.batik.bridge.PaintServer.convertFillPaint(PaintServer.java:242)
[exec] at org.apache.batik.bridge.PaintServer.convertFillAndStroke(PaintServer.java:160)
[exec] at org.apache.batik.bridge.SVGShapeElementBridge.createShapePainter(SVGShapeElementBridge.java:117)
[exec] at org.apache.batik.bridge.SVGRectElementBridge.createShapePainter(SVGRectElementBridge.java:153)
[exec] at org.apache.batik.bridge.SVGShapeElementBridge.buildGraphicsNode(SVGShapeElementBridge.java:91)
[exec] at org.apache.batik.bridge.GVTBuilder.buildGraphicsNode(GVTBuilder.java:224)
[exec] at org.apache.batik.bridge.GVTBuilder.buildComposite(GVTBuilder.java:171)

The fix is to compose the base URL and the fragment into a ParsedURLData:

In the ParsedURLDataProtocolHandler the method:

  public ParsedURLData parseURL(ParsedURL baseURL, String urlStr) {
        // No relative form...
        return parseURL(urlStr);
    }

should change to:

  public ParsedURLData parseURL(ParsedURL baseURL, String urlStr) {
       if (urlStr.startsWith("#")) {
          // Use the base, it contains the encoded document
          ParsedURLData parseURL = parseURL(baseURL.toString());
          // .. and pass the reference
          parseURL.ref = urlStr.substring(1); // Skip the #
          return parseURL;
        } else {
          // No relative form...
          return parseURL(urlStr);
        }
  }

Issue Links

• links to: GitHub Pull Request #21