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var path = require('path');
var args = process.argv.splice(2);
var express = require('express');
var net = require('net');
var app = express();
var argsjson =JSON.parse(args[0]); //解析参数
var projects = argsjson.projects; //项目信息
var port = argsjson.port; //server启动端口
var hot = argsjson.hot; //是否要热刷新
var marked = require('marked'); //markdown预览插件
var iconv = require('iconv-lite'); //流操作辅助模块
var fs = require('fs'); //文件操作模块，读取md文件
var cookieParser = require('cookie-parser'); //cookie模块
app.use(express.static(path.join(__dirname, 'public')));
app.use(express.static(path.join(__dirname, 'imgsource')));
app.use(cookieParser());
app.get('/dcloudmdpaser', function (req, res) { //markdown预览方法
var filename = req.query.filename; //markdown文件（全路径）
var theme = req.query.theme; //皮肤样式 默认/
var projectname = req.query.projectname; //markdown文件所在项目，外部的markdown文件这个值是空的
projectname = decodeURI(projectname);
filename = decodeURI(filename);
var repath = req.query.repath; //markdown文件相对于项目根路径的相对路径
repath = decodeURI(repath);
var charset = req.query.charset; //编码
if(charset == "" || charset==undefined) {//不设置编码的话默认是u8
charset = "utf-8";
}
if(theme==""||theme==undefined){ //默认使用github的markdown样式
theme = "github-markdown.css";
}
var fileStr = fs.readFileSync(req.query.filename, {encoding:'binary'}); //读取markdown文件内容
var buf = new Buffer(fileStr, 'binary');
var str = iconv.decode(buf, charset);
var html = marked(str); //使用marked解析markdown为html
var htmlstart = "<!DOCTYPE html><html><head><meta charset=\""+charset+"\" /><link rel=\"stylesheet\" href=\"/stylesheets/style.css\" type=\"text/css\" charset=\""+charset+"\" /><link rel=\"stylesheet\" href=\"/stylesheets/"+theme+"\" type=\"text/css\" charset=\""+charset+"\" /><link rel=\"stylesheet\" href=\"/stylesheets/prism.css\" type=\"text/css\" charset=\""+charset+"\" /><script src=\"/javascripts/prism.js\" type=\"text/javascript\" charset=\""+charset+"\"></script></head><body>"
var htmlend = "</body></html>";
html = htmlstart+html+htmlend;
res.cookie('projectname', req.query.projectname, { expires: new Date(Date.now() + 900000), httpOnly: true }); //把项目名保存到cookie里
res.cookie('repath', req.query.repath, { expires: new Date(Date.now() + 900000), httpOnly: true });//把相对路径保存到cookie里
if(projectname==''){ //这说明是个外部的markdown文件
var virtualprojectdir = filename.substring(0,filename.lastIndexOf("/")); //取出markdown文件所在目录
var virtualprojectname = virtualprojectdir.substring(virtualprojectdir.lastIndexOf("/")+1,virtualprojectdir.length);//虚拟一个项目名出来
//把虚拟出来的项目信息写到cookie里
app.use('/'+encodeURIComponent(virtualprojectname),express.static(virtualprojectdir+''));
res.cookie('projectname', virtualprojectname, { expires: new Date(Date.now() + 900000), httpOnly: true });
res.cookie('repath', '', { expires: new Date(Date.now() + 900000), httpOnly: true });
res.cookie('virtualprojectdir', virtualprojectdir, { expires: new Date(Date.now() + 900000), httpOnly: true });
}else{
//如果是项目内的markdown清除虚拟项目名
res.cookie('virtualprojectdir', '', { expires: new Date(Date.now() + 900000), httpOnly: true });
}
res.send(html);
})
process.on('uncaughtException', function (err) { //这个是热刷新监听方法有时候会报错，但是不影响运行，catch住不管他
console.error(err.stack);
console.log("Node NOT Exiting...");
});
//把项目路径添加到一个list里
var joins = new Array();
projects.forEach(function (value,index,array) {
joins.push(path.resolve(decodeURIComponent(value.path)));
});
//开启热刷新时，把上面的list传给对应参数
if (app.get('env') === 'development'&&hot) {
var livereload = require('easy-livereload');
app.use(livereload({
watchDirs: joins,
checkFunc:function(file){
return true;
},
port: process.env.LIVERELOAD_PORT || 35729
}));
}
//静态目录代理
projects.forEach(function (value,index,array) {
var pname = decodeURIComponent(value.name)
var ppath = decodeURIComponent(value.path)
app.use('/'+encodeURIComponent(pname),express.static(ppath+''));
});
//处理静态监听找不到的文件
app.get('*', function(req, res){
var projectname = req.cookies.projectname;
var repath = req.cookies.repath;
var virtualprojectdir = req.cookies.virtualprojectdir;
var originalUrl = req.originalUrl;
var ext ='';
if(originalUrl.indexOf('.')>0){//后缀名，主要是监听看是不是图片
ext = originalUrl.substring(originalUrl.lastIndexOf('.')+1);
ext = ext.toLowerCase();
}
if(ext=='jpg'||ext=='png'||ext=='gif'){ //如果是图片大概率是markdown预览要使用的，那么拼下url看看能访问到不
if(virtualprojectdir!=''){//这个是外部markdown文件，那就直接以流的形式把图片丢回去
res.set( 'content-type', ext );//设置返回类型
var stream = fs.createReadStream( virtualprojectdir+"/"+req.cookies.repath+"/"+ originalUrl );
var responseData = [];//存储文件流
if (stream) {//判断状态
stream.on( 'data', function( chunk ) {
responseData.push( chunk );
});
stream.on( 'end', function() {
var finalData = Buffer.concat( responseData );
res.write( finalData );
res.end();
});
}
}else{//内部markdown文件，那么项目下必然存在该图片，重新组装下url
res.redirect("/" + req.cookies.projectname +"/"+req.cookies.repath+"/"+ originalUrl);
}
}else{
//到这里说明这个文件真不知道是干啥的，在哪里了，返回404页面吧
res.sendFile( __dirname + "/" + "404.html" );
}
});
//启动server
var server = app.listen(port, function () {
console.log('server start at '+port);
})
server.on('error', function(err) { console.log(err); });
//热刷新代码
if(args.length > 1 && args[1].length>0){
var count = 0;
function checkMain(){
var client= new net.Socket();
client.connect(args[1], function(){
count = 0;
client.destroy();
setTimeout(checkMain, 2000);
});
client.on('error',function(error){
if(error.code === 'ENOENT'){
count++;
}
if(count>=2){
process.exit();
}else{
setTimeout(checkMain, 2000);
}
});
}
setTimeout(checkMain, 2000);
}
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