257 lines
8.1 KiB
JavaScript
257 lines
8.1 KiB
JavaScript
/**
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* This Module manages all /minified/* requests. It controls the
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* minification && compression of Javascript and CSS.
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*/
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/*
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* 2011 Peter 'Pita' Martischka
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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 settings = require('./settings');
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var async = require('async');
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var fs = require('fs');
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var cleanCSS = require('clean-css');
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var jsp = require("uglify-js").parser;
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var pro = require("uglify-js").uglify;
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var path = require('path');
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var Buffer = require('buffer').Buffer;
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var gzip = require('gzip');
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var server = require('./server');
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/**
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* Answers a http request for the pad javascript
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* @param req the Express request
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* @param res the Express response
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*/
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exports.padJS = function(req, res)
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{
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res.header("Content-Type","text/javascript");
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var jsFiles = ["jquery.min.js", "plugins.js", "undo-xpopup.js", "json2.js", "pad_utils.js", "pad_cookie.js", "pad_editor.js", "pad_editbar.js", "pad_docbar.js", "pad_modals.js", "ace.js", "collab_client.js", "pad_userlist.js", "pad_impexp.js", "pad_savedrevs.js", "pad_connectionstatus.js", "pad2.js"];
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//minifying is enabled
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if(settings.minify)
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{
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var fileValues = {};
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var embeds = {};
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var latestModification = 0;
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async.series([
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//find out the highest modification date
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function(callback)
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{
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var folders2check = ["../static/css","../static/js"];
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//go trough this two folders
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async.forEach(folders2check, function(path, callback)
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{
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//read the files in the folder
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fs.readdir(path, function(err, files)
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{
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if(err) { callback(err); return; }
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//we wanna check the directory itself for changes too
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files.push(".");
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//go trough all files in this folder
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async.forEach(files, function(filename, callback)
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{
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//get the stat data of this file
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fs.stat(path + "/" + filename, function(err, stats)
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{
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if(err) { callback(err); return; }
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//get the modification time
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var modificationTime = stats.mtime.getTime();
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//compare the modification time to the highest found
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if(modificationTime > latestModification)
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{
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latestModification = modificationTime;
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}
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callback();
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});
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}, callback);
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});
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}, callback);
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},
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function(callback)
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{
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//check the modification time of the minified js
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fs.stat("../var/minified_pad.js", function(err, stats)
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{
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if(err && err.code != "ENOENT") callback(err);
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//there is no minfied file or there new changes since this file was generated, so continue generating this file
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if((err && err.code == "ENOENT") || stats.mtime.getTime() < latestModification)
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{
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callback();
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}
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//the minified file is still up to date, stop minifying
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else
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{
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callback("stop");
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}
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});
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},
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//load all js files
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function (callback)
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{
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async.forEach(jsFiles, function (item, callback)
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{
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fs.readFile("../static/js/" + item, "utf-8", function(err, data)
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{
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fileValues[item] = data;
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callback(err);
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});
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}, callback);
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},
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//find all includes in ace.js and embed them
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function(callback)
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{
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var founds = fileValues["ace.js"].match(/\$\$INCLUDE_[a-zA-Z_]+\([a-zA-Z0-9.\/_"]+\)/gi);
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//go trough all includes
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async.forEach(founds, function (item, callback)
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{
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var filename = item.match(/"[^"]*"/g)[0].substr(1);
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filename = filename.substr(0,filename.length-1);
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var type = item.match(/INCLUDE_[A-Z]+/g)[0].substr("INCLUDE_".length);
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var quote = item.search("_Q") != -1;
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//read the included file
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fs.readFile("../" + filename, "utf-8", function(err, data)
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{
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//compress the file
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if(type == "JS")
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{
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embeds[item] = "<script>\n" + compressJS([data])+ "\n\\x3c/script>";
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}
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else
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{
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embeds[item] = "<style>" + compressCSS([data])+ "</style>";
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}
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//do the first escape
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embeds[item] = JSON.stringify(embeds[item]).replace(/'/g, "\\'").replace(/\\"/g, "\"");
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embeds[item] = embeds[item].substr(1);
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embeds[item] = embeds[item].substr(0, embeds[item].length-1);
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//add quotes, if wished
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if(quote)
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{
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embeds[item] = "'" + embeds[item] + "'";
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}
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//do the second escape
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embeds[item] = JSON.stringify(embeds[item]).replace(/'/g, "\\'").replace(/\"/g, "\"");
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embeds[item] = embeds[item].substr(1);
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embeds[item] = embeds[item].substr(0, embeds[item].length-1);
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embeds[item] = "'" + embeds[item] + "'";
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callback(err);
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});
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}, function(err)
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{
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//replace the include command with the include
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for(var i in embeds)
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{
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fileValues["ace.js"]=fileValues["ace.js"].replace(i, embeds[i]);
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}
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callback(err);
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});
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},
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//put all together and write it into a file
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function(callback)
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{
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//put all javascript files in an array
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var values = [];
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for(var i in jsFiles)
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{
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values.push(fileValues[jsFiles[i]]);
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}
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//minify all javascript files to one
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var result = compressJS(values);
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async.parallel([
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//write the results plain in a file
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function(callback)
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{
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fs.writeFile("../var/minified_pad.js", result, "utf8", callback);
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},
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//write the results compressed in a file
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function(callback)
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{
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gzip(result, 9, function(err, compressedResult){
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if(err) {callback(err); return}
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fs.writeFile("../var/minified_pad.js.gz", compressedResult, callback);
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});
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}
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],callback);
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}
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], function(err)
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{
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if(err && err != "stop") throw err;
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//check if gzip is supported by this browser
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var gzipSupport = req.header('Accept-Encoding', '').indexOf('gzip') != -1;
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var pathStr;
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if(gzipSupport)
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{
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pathStr = path.normalize(__dirname + "/../var/minified_pad.js.gz");
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res.header('Content-Encoding', 'gzip');
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}
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else
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{
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pathStr = path.normalize(__dirname + "/../var/minified_pad.js");
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}
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res.sendfile(pathStr, { maxAge: server.maxAge });
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})
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}
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//minifying is disabled, so load the files with jquery
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else
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{
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for(var i in jsFiles)
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{
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res.write("$.getScript('/static/js/" + jsFiles[i]+ "');\n");
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}
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res.end();
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}
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}
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function compressJS(values)
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{
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var complete = values.join("\n");
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var ast = jsp.parse(complete); // parse code and get the initial AST
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ast = pro.ast_mangle(ast); // get a new AST with mangled names
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ast = pro.ast_squeeze(ast); // get an AST with compression optimizations
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return pro.gen_code(ast); // compressed code here
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}
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function compressCSS(values)
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{
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var complete = values.join("\n");
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return cleanCSS.process(complete);
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}
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