pro.verron.officestamper.core.DocxImageExtractor Maven / Gradle / Ivy

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Office-stamper is a Java template engine for docx documents, forked from org.wickedsource.docx-stamper
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package pro.verron.officestamper.core;

import jakarta.xml.bind.JAXBElement;
import org.docx4j.dml.Graphic;
import org.docx4j.dml.picture.Pic;
import org.docx4j.dml.wordprocessingDrawing.Inline;
import org.docx4j.openpackaging.exceptions.Docx4JException;
import org.docx4j.openpackaging.packages.WordprocessingMLPackage;
import org.docx4j.wml.Drawing;
import org.docx4j.wml.R;
import pro.verron.officestamper.api.OfficeStamperException;

import java.io.IOException;
import java.io.InputStream;
import java.util.Arrays;

/**
 * Extracts images from a docx document.
 *
 * @author Joseph Verron
 * @version ${version}
 * @since 1.4.7
 */
public class DocxImageExtractor {

	private final WordprocessingMLPackage wordprocessingMLPackage;

	/**
	 * Creates a new image extractor for the given docx document.
	 *
	 * @param wordprocessingMLPackage the docx document to extract images from.
	 */
	public DocxImageExtractor(WordprocessingMLPackage wordprocessingMLPackage) {
		this.wordprocessingMLPackage = wordprocessingMLPackage;
	}

	/**
	 * Extract an image bytes from an embedded image run.
	 *
	 * @param run run containing the embedded drawing.
	 */
	byte[] getRunDrawingData(R run) {
		String imageRelId = getPic(run).getBlipFill().getBlip().getEmbed();
		String imageRelPartName = getImageRelPartName(imageRelId);
		long size = getImageSize(imageRelPartName);
		InputStream stream = getImageStream(imageRelPartName);
		return streamToByteArray(size, stream);
	}

	private static Pic getPic(R run) {
		for (Object runContent : run.getContent()) {
			if (!(runContent instanceof JAXBElement runElement)) break;
			if (!(runElement.getValue() instanceof Drawing drawing)) break;
			Graphic graphic = getInlineGraphic(drawing);
			return graphic.getGraphicData().getPic();
		}
		throw new OfficeStamperException("Run drawing not found !");
	}

	private String getImageRelPartName(String imageRelId) {
		// TODO_LATER: find a better way to find image rel part name in source part store
		return wordprocessingMLPackage
				.getMainDocumentPart()
				.getRelationshipsPart()
				.getPart(imageRelId)
				.getPartName()
				.getName()
				.substring(1);
	}

	/**
	 * Extract an inline graphic from a drawing.
	 *
	 * @param drawing the drawing containing the graphic.
	 */
	private static Graphic getInlineGraphic(Drawing drawing) {
		if (drawing.getAnchorOrInline()
				   .isEmpty()) {
			throw new OfficeStamperException("Anchor or Inline is empty !");
		}
		Object anchorOrInline = drawing.getAnchorOrInline()
									   .get(0);
		if (anchorOrInline instanceof Inline inline) {
			return inline.getGraphic();
		}
		else {
			throw new OfficeStamperException("Don't know how to process anchor !");
		}
	}

	/**
	 * Converts an InputStream to a byte array.
	 *
	 * @param size expected size of the byte array.
	 * @param is   input stream to read data from.
	 * @return the data from the input stream.
	 */
	private static byte[] streamToByteArray(long size, InputStream is) {
		if (size > Integer.MAX_VALUE)
			throw new OfficeStamperException("Image size exceeds maximum allowed (2GB)");

		int intSize = (int) size;
		byte[] data = new byte[intSize];
		int numRead = tryRead(is, data);
		return Arrays.copyOfRange(data, 0, numRead);
	}

	private static int tryRead(InputStream is, byte[] data) {
		try {
			return is.read(data);
		} catch (IOException e) {
			throw new OfficeStamperException(e);
		}
	}

	private long getImageSize(String imageRelPartName) {
		try {
			return wordprocessingMLPackage
					.getSourcePartStore()
					.getPartSize(imageRelPartName);
		} catch (Docx4JException e) {
			throw new OfficeStamperException(e);
		}
	}

	private InputStream getImageStream(String imageRelPartName) {
		try {
			return wordprocessingMLPackage
					.getSourcePartStore()
					.loadPart(imageRelPartName);
		} catch (Docx4JException e) {
			throw new OfficeStamperException(e);
		}
	}

	/**
	 * Extract the name of the image from an embedded image run.
	 *
	 * @param run run containing the embedded drawing.
	 * @return a {@link String} object
	 */
	public String getRunDrawingFilename(R run) {
		return getPic(run).getNvPicPr().getCNvPr().getName();
	}

	/**
	 * Extract the content type of the image from an embedded image run.
	 *
	 * @param run run containing the embedded drawing.
	 * @return a {@link String} object
	 */
	public String getRunDrawingAltText(R run) {
		return getPic(run).getNvPicPr().getCNvPr().getDescr();
	}

	/**
	 * Extract the width of the image from an embedded image run.
	 *
	 * @param run run containing the embedded drawing.
	 * @return a {@link Integer} object
	 */
	public Integer getRunDrawingMaxWidth(R run) {
		return (int) getPic(run).getSpPr().getXfrm().getExt().getCx();
	}
}