let server = http.createServer();
let url = require('url');
server.on('connection', function (socket) {
  console.log('客戶端連接 ');
});
server.on('request', function (req, res) {
  let { pathname, query } = url.parse(req.url, true);
  let result = [];
  req.on('data', function (data) {
    result.push(data);
  });
  req.on('end', function () {
    let r = Buffer.concat(result);
    res.end(r);
  })
});
server.on('close', function (req, res) {
  console.log('服務(wù)器關(guān)閉 ');
});
server.on('error', function (err) {
  console.log('服務(wù)器錯(cuò)誤 ');
});
server.listen(8080, function () {
  console.log('server started at http://localhost:8080');
});

let fs = require("fs");
let path = require("path");
let zlib = require("zlib");
function gzip(src) {
 fs
  .createReadStream(src)
  .pipe(zlib.createGzip())
  .pipe(fs.createWriteStream(src + ".gz"));
}
gzip(path.join(__dirname,'msg.txt'));
function gunzip(src) {
 fs
  .createReadStream(src)
  .pipe(zlib.createGunzip())
  .pipe(
   fs.createWriteStream(path.join(__dirname, path.basename(src, ".gz")))
  );
}
gunzip(path.join(__dirname, "msg.txt.gz"));

let zlib=require('zlib');
let str='hello';
zlib.gzip(str,(err,buffer)=>{
  console.log(buffer.length);
  zlib.unzip(buffer,(err,data)=>{
    console.log(data.toString());
  })
});

let http = require("http");
let path = require("path");
let url = require("url");
let zlib = require("zlib");
let fs = require("fs");
let { promisify } = require("util");
let mime = require("mime");
//把一個(gè)異步方法轉(zhuǎn)成一個(gè)返回promise的方法
let stat = promisify(fs.stat);
http.createServer(request).listen(8080);
async function request(req, res) {
 let { pathname } = url.parse(req.url); 
 let filepath = path.join(__dirname, pathname); 
 // fs.stat(filepath,(err,stat)=>{});現(xiàn)在不這么寫了，異步的處理起來(lái)比較麻煩
 try {
  let statObj = await stat(filepath);
  res.setHeader("Content-Type", mime.getType(pathname));
  let acceptEncoding = req.headers["accept-encoding"];
  if (acceptEncoding) {
   if (acceptEncoding.match(/\bgzip\b/)) {
    
    res.setHeader("Content-Encoding", "gzip");
    fs
     .createReadStream(filepath)
     .pipe(zlib.createGzip())
     .pipe(res);
   } else if (acceptEncoding.match(/\bdeflate\b/)) {
    res.setHeader("Content-Encoding", "deflate");
    fs
     .createReadStream(filepath)
     .pipe(zlib.createDeflate())
     .pipe(res);
   } else {
    fs.createReadStream(filepath).pipe(res);
   }
  } else {
   fs.createReadStream(filepath).pipe(res);
  }
 } catch (e) {
  res.statusCode = 404;
  res.end("Not Found");
 }
}

let http = require('http');
let url = require('url');
let path = require('path');
let fs = require('fs');
let mime = require('mime');
// http://localhost:8080/index.html
http.createServer(function (req, res) {
  let { pathname } = url.parse(req.url, true);
  //D:\vipcode\201801\20.cache\index.html
  let filepath = path.join(__dirname, pathname);
  fs.stat(filepath, (err, stat) => {
    if (err) {
      return sendError(req, res);
    } else {
      let ifModifiedSince = req.headers['if-modified-since'];
      let LastModified = stat.ctime.toGMTString();
      if (ifModifiedSince == LastModified) {
        res.writeHead(304);
        res.end('');
      } else {
        return send(req, res, filepath, stat);
      }
    }
  });
}).listen(8080);
function sendError(req, res) {
  res.end('Not Found');
}
function send(req, res, filepath, stat) {
  res.setHeader('Content-Type', mime.getType(filepath));
  //發(fā)給客戶端之后，客戶端會(huì)把此時(shí)間保存起來(lái)，下次再獲取此資源的時(shí)候會(huì)把這個(gè)時(shí)間再發(fā)回服務(wù)器
  res.setHeader('Last-Modified', stat.ctime.toGMTString());
  fs.createReadStream(filepath).pipe(res);
}

let http = require('http');
let url = require('url');
let path = require('path');
let fs = require('fs');
let mime = require('mime');
let crypto = require('crypto');

http.createServer(function (req, res) {
  let { pathname } = url.parse(req.url, true);
  
  let filepath = path.join(__dirname, pathname);
  fs.stat(filepath, (err, stat) => {
    if (err) {
      return sendError(req, res);
    } else {
      let ifNoneMatch = req.headers['if-none-match'];
      let out = fs.createReadStream(filepath);
      let md5 = crypto.createHash('md5');

      out.on('data', function (data) {
        md5.update(data);
      });
      out.on('end', function () {
      
        let etag = md5.digest('hex');
        let etag = `${stat.size}`;
        if (ifNoneMatch == etag) {
          res.writeHead(304);
          res.end('');
        } else {
          return send(req, res, filepath, etag);
        }
      });

    }
  });
}).listen(8080);
function sendError(req, res) {
  res.end('Not Found');
}
function send(req, res, filepath, etag) {
  res.setHeader('Content-Type', mime.getType(filepath));
  
  res.setHeader('ETag', etag);
  fs.createReadStream(filepath).pipe(res);
}

let http = require('http');
let url = require('url');
let path = require('path');
let fs = require('fs');
let mime = require('mime');
let crypto = require('crypto');
http.createServer(function (req, res) {
  let { pathname } = url.parse(req.url, true);
  let filepath = path.join(__dirname, pathname);
  console.log(filepath);
  fs.stat(filepath, (err, stat) => {
    if (err) {
      return sendError(req, res);
    } else {
      send(req, res, filepath);
    }
  });
}).listen(8080);
function sendError(req, res) {
  res.end('Not Found');
}
function send(req, res, filepath) {
  res.setHeader('Content-Type', mime.getType(filepath));
  res.setHeader('Expires', new Date(Date.now() + 30 * 1000).toUTCString());
  res.setHeader('Cache-Control', 'max-age=30');
  fs.createReadStream(filepath).pipe(res);
}

 let http = require('http');
 let server = http.createServer();
    server.on('request', this.request.bind(this));
    server.listen(this.config.port, () => {
      let url = `http://${this.config.host}:${this.config.port}`;
      debug(`server started at ${chalk.green(url)}`);
    });

 async request(req, res) {
    let { pathname } = url.parse(req.url);
    if (pathname == '/favicon.ico') {
      return this.sendError('not found', req, res);
    }
    let filepath = path.join(this.config.root, pathname);
    try {
      let statObj = await stat(filepath);
      if (statObj.isDirectory()) {
        let files = await readdir(filepath);
        files = files.map(file => ({
          name: file,
          url: path.join(pathname, file)
        }));
        let html = this.list({
          title: pathname,
          files
        });
        res.setHeader('Content-Type', 'text/html');
        res.end(html);
      } else {
        this.sendFile(req, res, filepath, statObj);
      }
    } catch (e) {
      debug(inspect(e));
      this.sendError(e, req, res);
    }
  }
  
  sendFile(req, res, filepath, statObj) {
    if (this.handleCache(req, res, filepath, statObj)) return;
    res.setHeader('Content-Type', mime.getType(filepath) + ';charset=utf-8');
    let encoding = this.getEncoding(req, res);
    let rs = this.getStream(req, res, filepath, statObj);

    if (encoding) {
      rs.pipe(encoding).pipe(res);
    } else {
      rs.pipe(res);
    }
  }

 getStream(req, res, filepath, statObj) {
    let start = 0;
    let end = statObj.size - 1;
    let range = req.headers['range'];
    if (range) {
      res.setHeader('Accept-Range', 'bytes');
      res.statusCode = 206;
      let result = range.match(/bytes=(\d*)-(\d*)/);
      if (result) {
        start = isNaN(result[1]) ? start : parseInt(result[1]);
        end = isNaN(result[2]) ? end : parseInt(result[2]) - 1;
      }
    }
    return fs.createReadStream(filepath, {
      start, end
    });
  }

handleCache(req, res, filepath, statObj) {
    let ifModifiedSince = req.headers['if-modified-since'];
    let isNoneMatch = req.headers['is-none-match'];
    res.setHeader('Cache-Control', 'private,max-age=30');
    res.setHeader('Expires', new Date(Date.now() + 30 * 1000).toGMTString());
    let etag = statObj.size;
    let lastModified = statObj.ctime.toGMTString();
    res.setHeader('ETag', etag);
    res.setHeader('Last-Modified', lastModified);
    if (isNoneMatch && isNoneMatch != etag) {
      return fasle;
    }
    if (ifModifiedSince && ifModifiedSince != lastModified) {
      return fasle;
    }
    if (isNoneMatch || ifModifiedSince) {
      res.writeHead(304);
      res.end();
      return true;
    } else {
      return false;
    }
  }

  getEncoding(req, res) {
    let acceptEncoding = req.headers['accept-encoding'];
    if (/\bgzip\b/.test(acceptEncoding)) {
      res.setHeader('Content-Encoding', 'gzip');
      return zlib.createGzip();
    } else if (/\bdeflate\b/.test(acceptEncoding)) {
      res.setHeader('Content-Encoding', 'deflate');
      return zlib.createDeflate();
    } else {
      return null;
    }
  }

function list() {
  let tmpl = fs.readFileSync(path.resolve(__dirname, 'template', 'list.html'), 'utf8');
  return handlebars.compile(tmpl);
}