etherpad-lite/node/minify.js

257 lines
8.1 KiB
JavaScript

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