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08b83ae358
This yields better conversion results, but requires the previous change, otherwise there would have been difficulties in locating the temporary file name.
125 lines
4.1 KiB
JavaScript
125 lines
4.1 KiB
JavaScript
/**
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* Controls the communication with LibreOffice
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*/
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/*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS-IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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var async = require("async");
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var fs = require("fs");
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var log4js = require('log4js');
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var os = require("os");
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var path = require("path");
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var settings = require("./Settings");
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var spawn = require("child_process").spawn;
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// Conversion tasks will be queued up, so we don't overload the system
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var queue = async.queue(doConvertTask, 1);
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var libreOfficeLogger = log4js.getLogger('LibreOffice');
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/**
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* Convert a file from one type to another
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*
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* @param {String} srcFile The path on disk to convert
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* @param {String} destFile The path on disk where the converted file should be stored
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* @param {String} type The type to convert into
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* @param {Function} callback Standard callback function
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*/
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exports.convertFile = function(srcFile, destFile, type, callback) {
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// Used for the moving of the file, not the conversion
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var fileExtension = type;
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if (type === "html") {
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// "html:XHTML Writer File:UTF8" does a better job than normal html exports
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type = "html:XHTML Writer File:UTF8";
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}
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// soffice can't convert from html to doc directly (verified with LO 5 and 6)
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// we need to convert to odt first, then to doc
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// to avoid `Error: no export filter for /tmp/xxxx.doc` error
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if (type === 'doc') {
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queue.push({
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"srcFile": srcFile,
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"destFile": destFile.replace(/\.doc$/, '.odt'),
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"type": 'odt',
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"callback": function () {
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queue.push({"srcFile": srcFile.replace(/\.html$/, '.odt'), "destFile": destFile, "type": type, "callback": callback, "fileExtension": fileExtension });
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}
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});
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} else {
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queue.push({"srcFile": srcFile, "destFile": destFile, "type": type, "callback": callback, "fileExtension": fileExtension});
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}
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};
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function doConvertTask(task, callback) {
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var tmpDir = os.tmpdir();
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async.series([
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/*
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* use LibreOffice to convert task.srcFile to another format, given in
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* task.type
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*/
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function(callback) {
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libreOfficeLogger.debug(`Converting ${task.srcFile} to format ${task.type}. The result will be put in ${tmpDir}`);
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var soffice = spawn(settings.soffice, [
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'--headless',
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'--invisible',
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'--nologo',
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'--nolockcheck',
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'--writer',
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'--convert-to', task.type,
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task.srcFile,
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'--outdir', tmpDir
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]);
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var stdoutBuffer = '';
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// Delegate the processing of stdout to another function
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soffice.stdout.on('data', function(data) {
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stdoutBuffer += data.toString();
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});
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// Append error messages to the buffer
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soffice.stderr.on('data', function(data) {
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stdoutBuffer += data.toString();
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});
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soffice.on('exit', function(code) {
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if (code != 0) {
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// Throw an exception if libreoffice failed
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return callback(`LibreOffice died with exit code ${code} and message: ${stdoutBuffer}`);
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}
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// if LibreOffice exited succesfully, go on with processing
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callback();
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})
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},
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// Move the converted file to the correct place
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function(callback) {
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var filename = path.basename(task.srcFile);
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var sourceFilename = filename.substr(0, filename.lastIndexOf('.')) + '.' + task.fileExtension;
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var sourcePath = path.join(tmpDir, sourceFilename);
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libreOfficeLogger.debug(`Renaming ${sourcePath} to ${task.destFile}`);
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fs.rename(sourcePath, task.destFile, callback);
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}
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], function(err) {
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// Invoke the callback for the local queue
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callback();
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// Invoke the callback for the task
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task.callback(err);
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});
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}
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