Eric Knauel created TIKA-1226:
---------------------------------
Summary: PDFTextStripper fails while getting data of PDF form
fields of type PDSignatureField
Key: TIKA-1226
URL: https://issues.apache.org/jira/browse/TIKA-1226
Project: Tika
Issue Type: Bug
Affects Versions: 1.5
Reporter: Eric Knauel
I have a PDF document that contains a filled in form. Among the various fields
of type text and radio button there are multiple fields for digital signatures.
When I load this document into tika-app I get the following exception:
Caused by: java.lang.RuntimeException: Can't get signature as String, use
getSignature() instead.
at
org.apache.pdfbox.pdmodel.interactive.form.PDSignatureField.getValue(PDSignatureField.java:131)
at
org.apache.tika.parser.pdf.PDF2XHTML.addFieldString(PDF2XHTML.java:467)
at
org.apache.tika.parser.pdf.PDF2XHTML.processAcroField(PDF2XHTML.java:425)
at
org.apache.tika.parser.pdf.PDF2XHTML.extractAcroForm(PDF2XHTML.java:411)
at org.apache.tika.parser.pdf.PDF2XHTML.endDocument(PDF2XHTML.java:184)
at
org.apache.pdfbox.util.PDFTextStripper.writeText(PDFTextStripper.java:330)
at org.apache.tika.parser.pdf.PDF2XHTML.process(PDF2XHTML.java:95)
at org.apache.tika.parser.pdf.PDFParser.parse(PDFParser.java:143)
at
org.apache.tika.parser.CompositeParser.parse(CompositeParser.java:242)
... 43 more
The problem seems to be that PDF2XHTML seems to expect that it can call
getValue() on all PDField objects. According to the PDFBox 1.8.3 java doc this
is not true for the sub class PDSignatureField:
http://pdfbox.apache.org/docs/1.8.3/javadocs/org/apache/pdfbox/pdmodel/interactive/form/PDSignatureField.html
The java doc says that getSignature() should be called instead.
Assuming that the information inside the signature is not relevant for the
extraction process and can be discarded the following patch helps:
Index: tika-parsers/src/main/java/org/apache/tika/parser/pdf/PDF2XHTML.java
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- tika-parsers/src/main/java/org/apache/tika/parser/pdf/PDF2XHTML.java
(revision 1560617)
+++ tika-parsers/src/main/java/org/apache/tika/parser/pdf/PDF2XHTML.java
(revision )
@@ -40,6 +40,7 @@
import
org.apache.pdfbox.pdmodel.interactive.documentnavigation.outline.PDOutlineNode;
import org.apache.pdfbox.pdmodel.interactive.form.PDAcroForm;
import org.apache.pdfbox.pdmodel.interactive.form.PDField;
+import org.apache.pdfbox.pdmodel.interactive.form.PDSignatureField;
import org.apache.pdfbox.util.PDFTextStripper;
import org.apache.pdfbox.util.TextPosition;
import org.apache.tika.exception.TikaException;
@@ -464,7 +465,9 @@
}
String value = "";
try {
+ if (!(field instanceof PDSignatureField)) {
- value = field.getValue();
+ value = field.getValue();
+ }
} catch (IOException e) {
//swallow
}
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