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#196 - Add OCR Support for PDF Embedded Pdf files
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155 changes: 155 additions & 0 deletions
155
lambda-ocr-tesseract/src/main/java/com/formkiq/module/lambda/ocr/pdf/PdfFormatConverter.java
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| /** | ||
| * MIT License | ||
| * | ||
| * Copyright (c) 2018 - 2020 FormKiQ | ||
| * | ||
| * Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| * of this software and associated documentation files (the "Software"), to deal | ||
| * in the Software without restriction, including without limitation the rights | ||
| * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| * copies of the Software, and to permit persons to whom the Software is | ||
| * furnished to do so, subject to the following conditions: | ||
| * | ||
| * The above copyright notice and this permission notice shall be included in all | ||
| * copies or substantial portions of the Software. | ||
| * | ||
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | ||
| * SOFTWARE. | ||
| */ | ||
| package com.formkiq.module.lambda.ocr.pdf; | ||
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|
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| import java.io.File; | ||
| import java.io.IOException; | ||
| import java.util.ArrayList; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
| import java.util.Map.Entry; | ||
| import org.apache.pdfbox.cos.COSDictionary; | ||
| import org.apache.pdfbox.pdmodel.PDDocument; | ||
| import org.apache.pdfbox.pdmodel.PDDocumentCatalog; | ||
| import org.apache.pdfbox.pdmodel.PDDocumentNameDictionary; | ||
| import org.apache.pdfbox.pdmodel.PDEmbeddedFilesNameTreeNode; | ||
| import org.apache.pdfbox.pdmodel.common.PDNameTreeNode; | ||
| import org.apache.pdfbox.pdmodel.common.filespecification.PDComplexFileSpecification; | ||
| import org.apache.pdfbox.pdmodel.common.filespecification.PDEmbeddedFile; | ||
| import org.apache.pdfbox.text.PDFTextStripper; | ||
| import com.formkiq.aws.dynamodb.objects.MimeType; | ||
| import com.formkiq.module.lambdaservices.AwsServiceCache; | ||
| import com.formkiq.module.ocr.FormatConverter; | ||
| import com.formkiq.module.ocr.OcrSqsMessage; | ||
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| /** | ||
| * DOCX {@link FormatConverter}. | ||
| */ | ||
| public class PdfFormatConverter implements FormatConverter { | ||
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| @Override | ||
| public String convert(final AwsServiceCache awsServices, final OcrSqsMessage sqsMessage, | ||
| final File file) throws IOException { | ||
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| StringBuilder sb = new StringBuilder(); | ||
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| PDFTextStripper pdfTextStripper = new PDFTextStripper(); | ||
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| try (PDDocument document = PDDocument.load(file)) { | ||
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| if (isPdfPortfolio(document)) { | ||
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| List<Map<String, String>> texts = getPortfolioTextMap(pdfTextStripper, document); | ||
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| for (Map<String, String> map : texts) { | ||
| sb.append(map.get("text")); | ||
| } | ||
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| } else { | ||
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| sb.append(pdfTextStripper.getText(document)); | ||
| } | ||
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| return sb.toString(); | ||
| } | ||
| } | ||
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| private List<Map<String, String>> extractFiles(final PDFTextStripper pdfTextStripper, | ||
| final Map<String, PDComplexFileSpecification> names) throws IOException { | ||
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| List<Map<String, String>> list = new ArrayList<>(); | ||
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| for (Entry<String, PDComplexFileSpecification> e : names.entrySet()) { | ||
| String filename = e.getKey(); | ||
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| PDComplexFileSpecification fileSpec = names.get(filename); | ||
| PDEmbeddedFile embeddedFile = fileSpec.getEmbeddedFile(); | ||
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| if (filename.endsWith(".pdf")) { | ||
| try (PDDocument document = PDDocument.load(embeddedFile.toByteArray())) { | ||
| list.add(Map.of("fileName", filename, "text", pdfTextStripper.getText(document))); | ||
| } | ||
| } | ||
| } | ||
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| return list; | ||
| } | ||
|
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| /** | ||
| * Get {@link Map} of Portfolio and Text. | ||
| * | ||
| * @param pdfTextStripper {@link PDFTextStripper} | ||
| * @param document {@link PDDocument} | ||
| * @return {@link Map} | ||
| * @throws IOException IOException | ||
| */ | ||
| private List<Map<String, String>> getPortfolioTextMap(final PDFTextStripper pdfTextStripper, | ||
| final PDDocument document) throws IOException { | ||
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| List<Map<String, String>> list = new ArrayList<>(); | ||
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| String text = pdfTextStripper.getText(document); | ||
| list.add(Map.of("fileName", "root", "text", text)); | ||
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| PDDocumentNameDictionary names = new PDDocumentNameDictionary(document.getDocumentCatalog()); | ||
| PDEmbeddedFilesNameTreeNode efTree = names.getEmbeddedFiles(); | ||
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| if (efTree != null) { | ||
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| Map<String, PDComplexFileSpecification> namesMap = efTree.getNames(); | ||
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| if (namesMap != null) { | ||
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| list.addAll(extractFiles(pdfTextStripper, namesMap)); | ||
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| } else { | ||
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| List<PDNameTreeNode<PDComplexFileSpecification>> kids = efTree.getKids(); | ||
| for (PDNameTreeNode<PDComplexFileSpecification> node : kids) { | ||
| namesMap = node.getNames(); | ||
| list.addAll(extractFiles(pdfTextStripper, namesMap)); | ||
| } | ||
| } | ||
| } | ||
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| return list; | ||
| } | ||
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| /** | ||
| * Whether {@link PDDocument} is a Portfolio. | ||
| * | ||
| * @param document {@link PDDocument} | ||
| * @return boolean | ||
| */ | ||
| private boolean isPdfPortfolio(final PDDocument document) { | ||
| PDDocumentCatalog catalog = document.getDocumentCatalog(); | ||
| COSDictionary cosObject = catalog.getCOSObject(); | ||
| return cosObject.containsKey("Collection"); | ||
| } | ||
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| @Override | ||
| public boolean isSupported(final OcrSqsMessage sqsMessage, final MimeType mineType) { | ||
| return MimeType.MIME_PDF.equals(mineType); | ||
| } | ||
| } |
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54 changes: 0 additions & 54 deletions
54
...r-tesseract/src/main/java/com/formkiq/module/lambda/ocr/tesseract/PdfFormatConverter.java
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