用nodejs做一个svn密码修改页面

　　linux上配置好svn服务后，管理修改密码还得去手工修改passwd这个文件，略麻烦，其实网上应该有配套的web管理修改界面程序。但我想自己用nodejs写一个，因为用node不用配置复杂的服务器。

　　弄这种基于事件模型的语言，一定要小心，整个过程可能不是线性的。

 var http = require("http");
 var fs = require('fs');
 var url = require('url');
 var query = require('querystring');

 var PASSWD_FILE = "/home/svn/conf/passwd";

 http.createServer(function(request, reponse) {
     var params = url.parse(request.url);
     var obj = query.parse(params.query);
     var tm = new Date();
     try {
         console.log(tm.toLocaleString());
         console.log(obj);
         reponse.writeHead(200, {"Content-Type": "text/html"});
         if(params.pathname == '/change') {
             changePassword(obj.name.trim(), obj.password.trim(), obj.npassword.trim(), reponse);

         } else {
         fs.readFile("./main.html", "utf-8", function(err, data) {
             reponse.write(data);
             reponse.end();
         });
         }
     } catch(err) {
             console.log(err);
     }
 }).listen(8000);

 function changePassword(name, password, npassword, reponse) {
     var change = false;
     fs.readFile(PASSWD_FILE, "utf-8", function(error, data) {
         arr = data.split('\n');
         for (var i = 0 ;i < arr.length; ++i) {
             if(arr[i].indexOf("#") == -1 && arr[i].indexOf("[users]") == -1) {
                 ap=arr[i].split("=");
                 if(ap.length != 2) {
                     continue;
                 }
                 var account = ap[0].trim();
                 var passwd = ap[1].trim()
                 if(name == account && password == passwd && npassword.length >= 3) {
                     change = true;
                     arr[i] = "";
                     console.log("change account "+account + " password " + npassword);
                     arr[i] = account + "=" + npassword;
                 }
             }
         }

         var outdata = "";
         for (var i = 0; i < arr.length; i++) {
             if(arr[i].replace(/(^s*)|(s*$)/g, "").length ==0) {
                 continue;
             }
             outdata += (arr[i] + '\n');
         };

         fs.writeFile(PASSWD_FILE, outdata ,"utf-8", function(error) {
             if(error || change == false) {
                 fs.readFile("./error.html", "utf-8", function(err, data) {
                 reponse.write(data);
                 reponse.end();
                 });
             } else {
                 fs.readFile("./success.html", "utf-8", function(err, data) {
                 reponse.write(data);
                 reponse.end();
                 });
             }
         });
     });
 }

启动脚本命令：nohup node main.js > node.log &

nohup & 启动程序并后台执行，不会使程序跟着控制台的死掉而死掉;> node.log把控制台的日志重定向到node.log中去。