const fs = require('fs-extra'); const path = require('path'); const utils = require('../../utils'); const sax = require('../../sax'); const ConvertJpegPng = require('./ConvertJpegPng'); class ConvertPdfImages extends ConvertJpegPng { check(data, opts) { const {inputFiles} = opts; return this.config.useExternalBookConverter && inputFiles.sourceFileType && inputFiles.sourceFileType.ext == 'pdf'; } async run(data, opts) { if (!this.check(data, opts)) return false; let {inputFiles, callback, abort, pdfQuality} = opts; pdfQuality = (pdfQuality && pdfQuality <= 100 && pdfQuality >= 10 ? pdfQuality : 20); const pdftoppmPath = '/usr/bin/pdftoppm'; if (!await fs.pathExists(pdftoppmPath)) throw new Error('Внешний конвертер pdftoppm не найден'); const pdftohtmlPath = '/usr/bin/pdftohtml'; if (!await fs.pathExists(pdftohtmlPath)) throw new Error('Внешний конвертер pdftohtml не найден'); const inpFile = inputFiles.sourceFile; const dir = `${inputFiles.filesDir}/`; const outBasename = `${dir}${utils.randomHexString(10)}`; const outFile = `${outBasename}.tmp`; //конвертируем в jpeg let perc = 0; await this.execConverter(pdftoppmPath, ['-jpeg', '-jpegopt', `quality=${pdfQuality},progressive=y`, inpFile, outFile], () => { perc = (perc < 100 ? perc + 1 : 40); callback(perc); }, abort); const limitSize = 2*this.config.maxUploadFileSize; let jpgFilesSize = 0; //ищем изображения let files = []; await utils.findFiles(async(file) => { if (path.extname(file) == '.jpg') { jpgFilesSize += (await fs.stat(file)).size; if (jpgFilesSize > limitSize) { throw new Error(`Файл для конвертирования слишком большой|FORLOG| jpgFilesSize: ${jpgFilesSize} > ${limitSize}`); } files.push({name: file, base: path.basename(file)}); } }, dir); files.sort((a, b) => a.base.localeCompare(b.base)); //схема документа (outline) const outXml = `${outBasename}.xml`; await this.execConverter(pdftohtmlPath, ['-nodrm', '-i', '-c', '-s', '-xml', inpFile, outXml], null, abort); const outline = []; let inOutline = 0; let inItem = false; let pageNum = 0; const onTextNode = (text, cutCounter, cutTag) => {// eslint-disable-line no-unused-vars if (inOutline > 0 && inItem && pageNum) { outline[pageNum] = text; } }; const onStartNode = (tag, tail, singleTag, cutCounter, cutTag) => {// eslint-disable-line no-unused-vars if (tag == 'outline') inOutline++; if (inOutline > 0 && tag == 'item') { const attrs = sax.getAttrsSync(tail); pageNum = (attrs.page && attrs.page.value ? attrs.page.value : 0); inItem = true; } }; const onEndNode = (tag, tail, singleTag, cutCounter, cutTag) => {// eslint-disable-line no-unused-vars if (tag == 'outline') inOutline--; if (tag == 'item') inItem = false; }; const dataXml = await fs.readFile(outXml); const buf = this.decode(dataXml).toString(); sax.parseSync(buf, { onStartNode, onEndNode, onTextNode }); await utils.sleep(100); //формируем список файлов let i = 0; const imageFiles = files.map(f => { i++; let alt = (outline[i] ? outline[i] : ''); return {src: f.name, alt}; }); return await super.run(data, Object.assign({}, opts, {imageFiles})); } } module.exports = ConvertPdfImages;