80 lines
2.8 KiB
JavaScript
80 lines
2.8 KiB
JavaScript
const fs = require('fs-extra');
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const path = require('path');
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const utils = require('../../utils');
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const ConvertJpegPng = require('./ConvertJpegPng');
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class ConvertPdfImages extends ConvertJpegPng {
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check(data, opts) {
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const {inputFiles} = opts;
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return this.config.useExternalBookConverter &&
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inputFiles.sourceFileType && inputFiles.sourceFileType.ext == 'pdf';
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}
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async run(data, opts) {
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if (!this.check(data, opts))
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return false;
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let {inputFiles, callback, abort, pdfQuality} = opts;
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pdfQuality = (pdfQuality && pdfQuality <= 100 && pdfQuality >= 10 ? pdfQuality : 20);
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const pdftoppmPath = '/usr/bin/pdftoppm';
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if (!await fs.pathExists(pdftoppmPath))
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throw new Error('Внешний конвертер pdftoppm не найден');
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const dir = `${inputFiles.filesDir}/`;
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const baseFile = `${dir}${path.basename(inputFiles.sourceFile)}`;
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const jpgFiles = `${baseFile}.tmp`;
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//конвертируем в jpeg
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let perc = 0;
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await this.execConverter(pdftoppmPath, ['-jpeg', '-jpegopt', `quality=${pdfQuality},progressive=y`, inputFiles.sourceFile, jpgFiles], () => {
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perc = (perc < 100 ? perc + 1 : 40);
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callback(perc);
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}, abort);
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const limitSize = 2*this.config.maxUploadFileSize;
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let jpgFilesSize = 0;
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//ищем изображения
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let files = [];
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await utils.findFiles(async(file) => {
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if (path.extname(file) == '.jpg') {
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jpgFilesSize += (await fs.stat(file)).size;
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if (jpgFilesSize > limitSize) {
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throw new Error(`Файл для конвертирования слишком большой|FORLOG| jpgFilesSize: ${jpgFilesSize} > ${limitSize}`);
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}
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files.push({name: file, base: path.basename(file)});
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}
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}, dir);
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files.sort((a, b) => a.base.localeCompare(b.base));
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//схема документа (outline)
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//const djvusedResult = await this.execConverter(djvusedPath, ['-u', '-e', 'print-outline', inputFiles.sourceFile]);
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const outline = [];
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/*const lines = djvusedResult.stdout.match(/\(".*"\s*?"#\d+".*?\)/g);
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if (lines) {
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lines.forEach(l => {
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const m = l.match(/"(.*)"\s*?"#(\d+)"/);
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if (m) {
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outline[m[2]] = m[1];
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}
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});
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}*/
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await utils.sleep(100);
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let i = 0;
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const imageFiles = files.map(f => {
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i++;
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let alt = (outline[i] ? outline[i] : '');
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return {src: f.name, alt};
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});
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return await super.run(data, Object.assign({}, opts, {imageFiles}));
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}
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}
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module.exports = ConvertPdfImages;
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