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Allow LibreOffice to be used when exporting a pad 

This commit adds support for LibreOffice when exporting a pad to doc, pdf, ..

This commit also cleans up some export logic when exporting to txt
This commit is contained in:
Simon Gaeremynck 2015-10-20 19:46:08 +01:00
parent 504cc102a0
commit 2bfc3026d2
5 changed files with 133 additions and 82 deletions
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6
settings.json.template
View File

@ -86,10 +86,14 @@
may cause problems during deployment. Set to 0 to disable caching */
"maxAge" : 21600, // 60 * 60 * 6 = 6 hours
/* This is the path to the Abiword executable. Setting it to null, disables abiword.
/* This is the absolute path to the Abiword executable. Setting it to null, disables abiword.
Abiword is needed to advanced import/export features of pads*/
"abiword" : null,
/* This is the absolute path to the soffice executable. Setting it to null, disables LibreOffice exporting.
LibreOffice can be used in lieu of Abiword to export pads */
"soffice" : null,
/* This is the path to the Tidy executable. Setting it to null, disables Tidy.
Tidy is used to improve the quality of exported pads*/
"tidyHtml" : null,

78
src/node/handler/ExportHandler.js
View File

@ -30,9 +30,15 @@ var os = require('os');
var hooks = require("ep_etherpad-lite/static/js/pluginfw/hooks");
var TidyHtml = require('../utils/TidyHtml');
var convertor = null;
//load abiword only if its enabled
if(settings.abiword != null)
var abiword = require("../utils/Abiword");
convertor = require("../utils/Abiword");
// Use LibreOffice if an executable has been defined in the settings
if(settings.soffice != null)
convertor = require("../utils/LibreOffice");
var tempDirectory = "/tmp";
@ -70,71 +76,11 @@ exports.doExport = function(req, res, padId, type)
}
else if(type == "txt")
{
var txt;
var randNum;
var srcFile, destFile;
async.series([
//render the txt document
function(callback)
exporttxt.getPadTXTDocument(padId, req.params.rev, false, function(err, txt)
{
exporttxt.getPadTXTDocument(padId, req.params.rev, false, function(err, _txt)
{
if(ERR(err, callback)) return;
txt = _txt;
callback();
});
},
//decide what to do with the txt export
function(callback)
{
//if this is a txt export, we can send this from here directly
if(ERR(err)) return;
res.send(txt);
callback("stop");
},
//send the convert job to abiword
function(callback)
{
//ensure html can be collected by the garbage collector
txt = null;
destFile = tempDirectory + "/etherpad_export_" + randNum + "." + type;
abiword.convertFile(srcFile, destFile, type, callback);
},
//send the file
function(callback)
{
res.sendFile(destFile, null, callback);
},
//clean up temporary files
function(callback)
{
async.parallel([
function(callback)
{
fs.unlink(srcFile, callback);
},
function(callback)
{
//100ms delay to accomidate for slow windows fs
if(os.type().indexOf("Windows") > -1)
{
setTimeout(function()
{
fs.unlink(destFile, callback);
}, 100);
}
else
{
fs.unlink(destFile, callback);
}
}
], callback);
}
], function(err)
{
if(err && err != "stop") ERR(err);
})
});
}
else
{
@ -183,11 +129,11 @@ exports.doExport = function(req, res, padId, type)
TidyHtml.tidy(srcFile, callback);
},
//send the convert job to abiword
//send the convert job to the convertor (abiword, libreoffice, ..)
function(callback)
{
destFile = tempDirectory + "/etherpad_export_" + randNum + "." + type;
abiword.convertFile(srcFile, destFile, type, callback);
convertor.convertFile(srcFile, destFile, type, callback);
},
//send the file
function(callback)

3
src/node/utils/ExportHtml.js
View File

@ -488,6 +488,9 @@ exports.getPadHTMLDocument = function (padId, revNum, noDocType, callback)
(noDocType ? '' : '<!doctype html>\n') +
'<html lang="en">\n' + (noDocType ? '' : '<head>\n' +
'<title>' + Security.escapeHTML(padId) + '</title>\n' +
'<meta name="generator" content="Etherpad Lite">\n' +
'<meta name="author" content="Etherpad Lite">\n' +
'<meta name="changedby" content="Etherpad Lite">\n' +
'<meta charset="utf-8">\n' +
'<style> * { font-family: arial, sans-serif;\n' +
'font-size: 13px;\n' +

93
src/node/utils/LibreOffice.js Normal file
View File

@ -0,0 +1,93 @@
/**
* Controls the communication with LibreOffice
*/
/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS-IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
var async = require("async");
var fs = require("fs");
var os = require("os");
var path = require("path");
var settings = require("./Settings");
var spawn = require("child_process").spawn;
// Conversion tasks will be queued up, so we don't overload the system
var queue = async.queue(doConvertTask, 1);
/**
* Convert a file from one type to another
*
* @param {String} srcFile The path on disk to convert
* @param {String} destFile The path on disk where the converted file should be stored
* @param {String} type The type to convert into
* @param {Function} callback Standard callback function
*/
exports.convertFile = function(srcFile, destFile, type, callback) {
queue.push({"srcFile": srcFile, "destFile": destFile, "type": type, "callback": callback});
};
function doConvertTask(task, callback) {
var tmpDir = os.tmpdir();
async.series([
// Generate a PDF file with LibreOffice
function(callback) {
var soffice = spawn(settings.soffice, [
'--headless',
'--invisible',
'--nologo',
'--nolockcheck',
'--convert-to', task.type,
task.srcFile,
'--outdir', tmpDir
]);
var stdoutBuffer = '';
// Delegate the processing of stdout to another function
soffice.stdout.on('data', function(data) {
stdoutBuffer += data.toString();
});
// Append error messages to the buffer
soffice.stderr.on('data', function(data) {
stdoutBuffer += data.toString();
});
// Throw an exception if libreoffice failed
soffice.on('exit', function(code) {
if (code != 0) {
return callback("LibreOffice died with exit code " + code + " and message: " + stdoutBuffer);
}
callback();
})
},
// Move the PDF file to the correct place
function(callback) {
var filename = path.basename(task.srcFile);
var pdfFilename = filename.substr(0, filename.lastIndexOf('.')) + '.' + task.type;
var pdfPath = path.join(tmpDir, pdfFilename);
fs.rename(pdfPath, task.destFile, callback);
}
], function(err) {
// Invoke the callback for the local queue
callback();
// Invoke the callback for the task
task.callback(err);
});
}

5
src/node/utils/Settings.js
View File

@ -152,6 +152,11 @@ exports.minify = true;
*/
exports.abiword = null;
/**
* The path of the libreoffice executable
*/
exports.soffice = null;
/**
* The path of the tidy executable
*/