103 lines
3.7 KiB
JavaScript
103 lines
3.7 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 ConvertHtml = require('./ConvertHtml');
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class ConvertDjvu extends ConvertHtml {
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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 == 'djvu';
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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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const {inputFiles, callback, abort, uploadFileName} = opts;
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const ddjvuPath = '/usr/bin/ddjvu';
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if (!await fs.pathExists(ddjvuPath))
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throw new Error('Внешний конвертер ddjvu не найден');
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const tiffsplitPath = '/usr/bin/tiffsplit';
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if (!await fs.pathExists(tiffsplitPath))
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throw new Error('Внешний конвертер tiffsplitPath не найден');
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const mogrifyPath = '/usr/bin/mogrify';
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if (!await fs.pathExists(mogrifyPath))
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throw new Error('Внешний конвертер mogrifyPath не найден');
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const dir = `${inputFiles.filesDir}/`;
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const inpFile = `${dir}${path.basename(inputFiles.sourceFile)}`;
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const tifFile = `${inpFile}.tif`;
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//конвертируем в tiff
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let perc = 0;
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await this.execConverter(ddjvuPath, ['-format=tiff', '-quality=50', '-verbose', inputFiles.sourceFile, tifFile], () => {
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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 tifFileSize = (await fs.stat(tifFile)).size;
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let limitSize = 3*this.config.maxUploadFileSize;
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if (tifFileSize > limitSize) {
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throw new Error(`Файл для конвертирования слишком большой|FORLOG| ${tifFileSize} > ${limitSize}`);
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}
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//разбиваем на файлы
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await this.execConverter(tiffsplitPath, [tifFile, dir], null, abort);
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await fs.remove(tifFile);
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//конвертируем в jpg
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await this.execConverter(mogrifyPath, ['-quality', '20', '-scale', '2048', '-verbose', '-format', 'jpg', `${dir}*.tif`], () => {
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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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//читаем изображения
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const loadImage = async(image) => {
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image.data = (await fs.readFile(image.file)).toString('base64');
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image.name = path.basename(image.file);
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}
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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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files.push({name: file, base: path.basename(file)});
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}, dir);
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files.sort((a, b) => a.base.localeCompare(b.base));
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let images = [];
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let loading = [];
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files.forEach(f => {
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const image = {file: f.name};
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images.push(image);
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loading.push(loadImage(image));
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});
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await Promise.all(loading);
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//формируем текст
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limitSize = 2*this.config.maxUploadFileSize;
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let title = '';
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if (uploadFileName)
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title = uploadFileName;
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let text = `<title>${title}</title>`;
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for (const image of images) {
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text += `<fb2-image type="image/jpeg" name="${image.name}">${image.data}</fb2-image>`;
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if (text.length > limitSize) {
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throw new Error(`Файл для конвертирования слишком большой|FORLOG| text.length: ${text.length} > ${limitSize}`);
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}
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}
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return await super.run(Buffer.from(text), {skipCheck: true, isText: true, cutTitle: true});
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}
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}
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module.exports = ConvertDjvu;
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