readDocument() reads native metadata

Author: Alex Dolski

src/main/java/edu/illinois/library/cantaloupe/processor/PdfBoxProcessor.java

@@ -21,6 +21,7 @@
 import org.apache.pdfbox.cos.COSObject;
 import org.apache.pdfbox.pdmodel.DefaultResourceCache;
 import org.apache.pdfbox.pdmodel.PDDocument;
+import org.apache.pdfbox.pdmodel.PDDocumentInformation;
 import org.apache.pdfbox.pdmodel.PDPage;
 import org.apache.pdfbox.pdmodel.common.PDMetadata;
 import org.apache.pdfbox.pdmodel.common.PDRectangle;
@@ -37,6 +38,7 @@
 import java.nio.file.Path;
 import java.util.Collections;
 import java.util.EnumSet;
+import java.util.HashMap;
 import java.util.Map;
 import java.util.Set;
 
@@ -178,14 +180,24 @@ public void put(COSObject indirect, PDXObject xobject) {
                 }
             });
 
-            // Read the document's XMP metadata.
-            final PDMetadata pdfMetadata = doc.getDocumentCatalog().getMetadata();
-            if (pdfMetadata != null) {
-                try (InputStream is = pdfMetadata.exportXMPMetadata()) {
-                    ByteArrayOutputStream os = new ByteArrayOutputStream();
-                    is.transferTo(os);
-                    metadata = new Metadata();
-                    metadata.setXMP(os.toByteArray());
+            metadata = new Metadata();
+            { // Read the document's native metadata.
+                PDDocumentInformation info = doc.getDocumentInformation();
+                Map<String, String> pdfMetadata = new HashMap<>();
+                for (String key : info.getMetadataKeys()) {
+                    pdfMetadata.put(key, info.getPropertyStringValue(key).toString());
+                }
+                metadata.setNativeMetadata(pdfMetadata);
+            }
+            { // Read the document's XMP metadata.
+                PDMetadata pdfMetadata = doc.getDocumentCatalog().getMetadata();
+                if (pdfMetadata != null) {
+                    try (InputStream is = pdfMetadata.exportXMPMetadata()) {
+                        ByteArrayOutputStream os = new ByteArrayOutputStream();
+                        is.transferTo(os);
+
+                        metadata.setXMP(os.toByteArray());
+                    }
                 }
             }
 

src/test/java/edu/illinois/library/cantaloupe/processor/PdfBoxProcessorTest.java

@@ -88,6 +88,13 @@ void testProcessWithIllegalPageOptionThrowsException() throws Exception {
                 () -> instance.process(ops, imageInfo, outputStream));
     }
 
+    @Test
+    void testReadInfoNativeMetadataAwareness() throws Exception {
+        instance.setSourceFile(TestUtil.getImage("pdf-xmp.pdf"));
+        Info info = instance.readInfo();
+        assertTrue(info.getMetadata().getNativeMetadata().isPresent());
+    }
+
     @Test
     void testReadInfoXMPAwareness() throws Exception {
         instance.setSourceFile(TestUtil.getImage("pdf-xmp.pdf"));