package com.estate.expert.admin.utils.wordtopdf;
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import lombok.extern.slf4j.Slf4j;
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import org.apache.poi.xwpf.usermodel.IBodyElement;
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import org.apache.poi.xwpf.usermodel.XWPFDocument;
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import org.apache.poi.xwpf.usermodel.XWPFFooter;
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import org.apache.poi.xwpf.usermodel.XWPFHeader;
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import org.apache.poi.xwpf.usermodel.XWPFParagraph;
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import org.apache.poi.xwpf.usermodel.XWPFRun;
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import org.apache.poi.xwpf.usermodel.XWPFTable;
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import org.apache.poi.xwpf.usermodel.XWPFTableCell;
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import org.apache.poi.xwpf.usermodel.XWPFTableRow;
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import org.jodconverter.core.office.OfficeException;
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import org.jodconverter.core.office.OfficeManager;
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import org.jodconverter.local.LocalConverter;
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import org.jodconverter.local.office.LocalOfficeManager;
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import javax.annotation.PreDestroy;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.util.Arrays;
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import java.util.LinkedHashSet;
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import java.util.List;
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import java.util.Locale;
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import java.util.Set;
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import java.util.concurrent.atomic.AtomicInteger;
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@Slf4j
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public class WordToPdfConverter {
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private static final String LIBRE_OFFICE_PATH = "/usr/lib/libreoffice";
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private static final String DEFAULT_FALLBACK_FONT = "Noto Sans CJK SC";
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private static final Set<String> WINDOWS_CJK_FONTS = new LinkedHashSet<>(Arrays.asList(
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"\u5b8b\u4f53", "SimSun",
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"\u5fae\u8f6f\u96c5\u9ed1", "Microsoft YaHei",
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"\u9ed1\u4f53", "SimHei",
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"\u4eff\u5b8b", "FangSong",
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"\u6977\u4f53", "KaiTi",
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"\u65b0\u5b8b\u4f53", "NSimSun",
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"\u7b49\u7ebf", "DengXian"
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));
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private static final List<String> SUPPORTED_EXTENSIONS = Arrays.asList(
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".doc", ".docx", ".rtf", ".txt", ".odt"
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);
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private static WordToPdfConverter instance;
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private final AtomicInteger conversionCount = new AtomicInteger(0);
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private OfficeManager officeManager;
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private WordToPdfConverter() {
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initializeOfficeManager();
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}
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public static synchronized WordToPdfConverter getInstance() {
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if (instance == null) {
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instance = new WordToPdfConverter();
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}
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return instance;
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}
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private void initializeOfficeManager() {
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try {
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log.info("Initializing LibreOffice manager");
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File officeHome = new File(LIBRE_OFFICE_PATH);
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if (!officeHome.exists() || !officeHome.isDirectory()) {
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throw new RuntimeException("LibreOffice home not found: " + LIBRE_OFFICE_PATH);
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}
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officeManager = LocalOfficeManager.builder()
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.officeHome(officeHome)
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.portNumbers(2002)
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.processTimeout(300000L)
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.taskExecutionTimeout(300000L)
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.maxTasksPerProcess(20)
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.install()
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.build();
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officeManager.start();
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log.info("LibreOffice manager started on port 2002");
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} catch (Exception e) {
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log.error("Failed to initialize LibreOffice manager", e);
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throw new RuntimeException("Unable to start LibreOffice service: " + e.getMessage(), e);
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}
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}
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public boolean convert(String wordFilePath, String pdfFilePath) {
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return convert(new File(wordFilePath), new File(pdfFilePath));
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}
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public boolean convert(File wordFile, File pdfFile) {
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long startTime = System.currentTimeMillis();
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int currentCount = conversionCount.incrementAndGet();
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File conversionSource = wordFile;
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try {
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validateInputFile(wordFile);
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prepareOutputDirectory(pdfFile);
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conversionSource = prepareConversionSource(wordFile);
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log.info("Start conversion [{}]: {} -> {}", currentCount, wordFile.getName(), pdfFile.getName());
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LocalConverter.builder()
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.officeManager(officeManager)
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.build()
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.convert(conversionSource)
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.to(pdfFile)
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.execute();
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boolean success = validateOutputFile(pdfFile);
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long costTime = System.currentTimeMillis() - startTime;
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if (success) {
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log.info("Conversion succeeded [{}]: {} -> {} ({} ms)",
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currentCount, wordFile.getName(), pdfFile.getName(), costTime);
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} else {
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log.warn("Conversion finished with invalid output [{}]: {} ({} ms)",
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currentCount, wordFile.getName(), costTime);
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}
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return success;
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} catch (Exception e) {
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log.error("Conversion failed [{}]: {}", currentCount, wordFile.getName(), e.getMessage(), e);
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return false;
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} finally {
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cleanupTemporarySource(wordFile, conversionSource);
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}
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}
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private File prepareConversionSource(File wordFile) {
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if (!shouldNormalizeDocxFonts(wordFile)) {
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return wordFile;
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}
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try {
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return normalizeDocxFonts(wordFile);
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} catch (Exception e) {
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log.warn("Docx font normalization failed, fallback to original file: {}", wordFile.getAbsolutePath(), e);
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return wordFile;
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}
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}
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private boolean shouldNormalizeDocxFonts(File wordFile) {
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return isLinux() && wordFile.getName().toLowerCase(Locale.ROOT).endsWith(".docx");
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}
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private boolean isLinux() {
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return System.getProperty("os.name", "").toLowerCase(Locale.ROOT).contains("linux");
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}
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private File normalizeDocxFonts(File sourceFile) throws IOException {
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Path tempFile = Files.createTempFile("estate-word-font-normalized-", ".docx");
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String fallbackFont = resolveFallbackFont();
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int replacedRuns = 0;
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try (InputStream inputStream = Files.newInputStream(sourceFile.toPath());
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XWPFDocument document = new XWPFDocument(inputStream);
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OutputStream outputStream = Files.newOutputStream(tempFile)) {
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replacedRuns += normalizeParagraphs(document.getParagraphs(), fallbackFont);
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replacedRuns += normalizeTables(document.getTables(), fallbackFont);
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for (XWPFHeader header : document.getHeaderList()) {
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replacedRuns += normalizeParagraphs(header.getParagraphs(), fallbackFont);
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replacedRuns += normalizeTables(header.getTables(), fallbackFont);
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}
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for (XWPFFooter footer : document.getFooterList()) {
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replacedRuns += normalizeParagraphs(footer.getParagraphs(), fallbackFont);
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replacedRuns += normalizeTables(footer.getTables(), fallbackFont);
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}
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document.write(outputStream);
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}
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log.info("Docx font normalization finished, fallbackFont={}, replacedRuns={}, source={}, temp={}",
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fallbackFont, replacedRuns, sourceFile.getAbsolutePath(), tempFile);
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return tempFile.toFile();
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}
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private int normalizeParagraphs(List<XWPFParagraph> paragraphs, String fallbackFont) {
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int replacedRuns = 0;
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for (XWPFParagraph paragraph : paragraphs) {
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replacedRuns += normalizeParagraph(paragraph, fallbackFont);
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}
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return replacedRuns;
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}
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private int normalizeParagraph(XWPFParagraph paragraph, String fallbackFont) {
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int replacedRuns = 0;
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for (XWPFRun run : paragraph.getRuns()) {
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if (normalizeRunFont(run, fallbackFont)) {
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replacedRuns++;
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}
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}
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return replacedRuns;
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}
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private int normalizeTables(List<XWPFTable> tables, String fallbackFont) {
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int replacedRuns = 0;
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for (XWPFTable table : tables) {
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for (XWPFTableRow row : table.getRows()) {
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for (XWPFTableCell cell : row.getTableCells()) {
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replacedRuns += normalizeBodyElements(cell.getBodyElements(), fallbackFont);
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}
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}
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}
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return replacedRuns;
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}
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private int normalizeBodyElements(List<IBodyElement> bodyElements, String fallbackFont) {
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int replacedRuns = 0;
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for (IBodyElement bodyElement : bodyElements) {
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if (bodyElement instanceof XWPFParagraph paragraph) {
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replacedRuns += normalizeParagraph(paragraph, fallbackFont);
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} else if (bodyElement instanceof XWPFTable table) {
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replacedRuns += normalizeTables(List.of(table), fallbackFont);
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}
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}
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return replacedRuns;
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}
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private boolean normalizeRunFont(XWPFRun run, String fallbackFont) {
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boolean shouldReplace = shouldReplaceFont(run.getFontFamily())
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|| shouldReplaceFont(run.getFontFamily(XWPFRun.FontCharRange.ascii))
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|| shouldReplaceFont(run.getFontFamily(XWPFRun.FontCharRange.cs))
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|| shouldReplaceFont(run.getFontFamily(XWPFRun.FontCharRange.eastAsia))
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|| shouldReplaceFont(run.getFontFamily(XWPFRun.FontCharRange.hAnsi));
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if (!shouldReplace) {
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return false;
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}
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run.setFontFamily(fallbackFont);
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run.setFontFamily(fallbackFont, XWPFRun.FontCharRange.ascii);
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run.setFontFamily(fallbackFont, XWPFRun.FontCharRange.cs);
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run.setFontFamily(fallbackFont, XWPFRun.FontCharRange.eastAsia);
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run.setFontFamily(fallbackFont, XWPFRun.FontCharRange.hAnsi);
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return true;
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}
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private boolean shouldReplaceFont(String fontName) {
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return fontName != null && WINDOWS_CJK_FONTS.contains(fontName.trim());
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}
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private String resolveFallbackFont() {
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String systemProperty = System.getProperty("estate.word.pdf.font");
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if (systemProperty != null && !systemProperty.isBlank()) {
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return systemProperty.trim();
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}
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String environmentValue = System.getenv("ESTATE_WORD_PDF_FONT");
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if (environmentValue != null && !environmentValue.isBlank()) {
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return environmentValue.trim();
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}
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return DEFAULT_FALLBACK_FONT;
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}
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private void cleanupTemporarySource(File originalFile, File conversionSource) {
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if (conversionSource == null || conversionSource.equals(originalFile)) {
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return;
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}
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try {
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Files.deleteIfExists(conversionSource.toPath());
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} catch (IOException e) {
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log.warn("Failed to delete temporary docx: {}", conversionSource.getAbsolutePath(), e);
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}
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}
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private void validateInputFile(File wordFile) {
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if (wordFile == null) {
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throw new IllegalArgumentException("Input file must not be null");
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}
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if (!wordFile.exists()) {
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throw new IllegalArgumentException("Input file does not exist: " + wordFile.getAbsolutePath());
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}
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if (!wordFile.isFile()) {
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throw new IllegalArgumentException("Input path is not a file: " + wordFile.getAbsolutePath());
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}
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String fileName = wordFile.getName().toLowerCase(Locale.ROOT);
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boolean supported = SUPPORTED_EXTENSIONS.stream().anyMatch(fileName::endsWith);
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if (!supported) {
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throw new IllegalArgumentException("Unsupported file type: " + fileName + ", supported: " + SUPPORTED_EXTENSIONS);
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}
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long fileSize = wordFile.length();
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long maxSize = 100L * 1024L * 1024L;
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if (fileSize > maxSize) {
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throw new IllegalArgumentException("File is too large: " + (fileSize / 1024 / 1024) + "MB, max is 100MB");
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}
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}
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private void prepareOutputDirectory(File pdfFile) {
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File parentDir = pdfFile.getParentFile();
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if (parentDir != null && !parentDir.exists() && !parentDir.mkdirs()) {
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throw new RuntimeException("Unable to create output directory: " + parentDir.getAbsolutePath());
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}
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}
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private boolean validateOutputFile(File pdfFile) {
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if (!pdfFile.exists()) {
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log.error("Output file was not created: {}", pdfFile.getAbsolutePath());
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return false;
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}
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if (pdfFile.length() == 0) {
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log.error("Output file is empty: {}", pdfFile.getAbsolutePath());
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return false;
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}
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try (FileInputStream inputStream = new FileInputStream(pdfFile)) {
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byte[] header = new byte[4];
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int read = inputStream.read(header);
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if (read >= 4) {
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boolean isPdf = header[0] == '%'
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&& header[1] == 'P'
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&& header[2] == 'D'
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&& header[3] == 'F';
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if (!isPdf) {
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log.warn("Output file is not a valid pdf: {}", pdfFile.getAbsolutePath());
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}
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return isPdf;
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}
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} catch (Exception e) {
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log.warn("Failed to validate pdf header", e);
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}
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return true;
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}
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public int batchConvert(List<File> wordFiles, File outputDir) {
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if (!outputDir.exists() && !outputDir.mkdirs()) {
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throw new RuntimeException("Unable to create batch output directory: " + outputDir.getAbsolutePath());
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}
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int successCount = 0;
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for (int i = 0; i < wordFiles.size(); i++) {
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File wordFile = wordFiles.get(i);
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try {
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String baseName = getFileBaseName(wordFile);
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File pdfFile = new File(outputDir, baseName + ".pdf");
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log.info("Batch conversion progress: {}/{} - {}", i + 1, wordFiles.size(), wordFile.getName());
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if (convert(wordFile, pdfFile)) {
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successCount++;
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}
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} catch (Exception e) {
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log.error("Batch conversion failed: {}", wordFile.getName(), e);
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}
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}
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log.info("Batch conversion finished: {}/{}", successCount, wordFiles.size());
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return successCount;
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}
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private String getFileBaseName(File file) {
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String name = file.getName();
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int dotIndex = name.lastIndexOf('.');
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return dotIndex == -1 ? name : name.substring(0, dotIndex);
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}
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public int getConversionCount() {
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return conversionCount.get();
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}
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public void restart() {
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log.info("Restarting LibreOffice service");
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shutdown();
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initializeOfficeManager();
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log.info("LibreOffice service restarted");
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}
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@PreDestroy
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public void shutdown() {
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if (officeManager != null && officeManager.isRunning()) {
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try {
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officeManager.stop();
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log.info("LibreOffice service stopped");
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} catch (OfficeException e) {
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log.error("Failed to stop LibreOffice service", e);
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}
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}
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}
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public boolean isServiceRunning() {
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return officeManager != null && officeManager.isRunning();
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}
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}
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