Question

我正在关注模块p-11（身份验证，散列，卷曲等）并想要创建用户，但它不知何故无法正常工作。问题是，只要我点击提交按钮我得到的不是缓冲区错误。不确定是什么问题。

我一直收到错误：TypeError：不是缓冲区

我已经需要body-parser和crypto。这是server.js中的相关代码：

function hash(input,salt){
      //how to create hash
      var hashed = crypto.pbkdf2Sync(input,salt, 10000, 512, 'sha512');
      return ['pbkdf2Sync',salt,hashed.toString('hex')].join('$');
     }

    app.post('/create-user',function(req,res){
      //take username and password as input and create entry in user table
      var username = req.body.username;
      var password = req.body.password;
      console.log(username);
      var salt= crypto.randomBytes(128).toString('hex');
      var dbString = hash(password,salt);

      pool.query('INSERT INTO "user"(username,password) VALUES($1,$2)',[username,dbString],function(err,result){
        if(err){
          res.status(500).send(err.toString());

        }else{
          res.send('user succesfully created'+username);
        }
      });
    });

    app.get('/hash/:input',function(req,res){
      var hashString = hash(req.params.input,'this-is-some-random-string');
      res.send(hashString);
    });

这是main.js中的相关代码

var submitButton = document.getElementById('submit_btn');
submitButton.onclick = function(){
    var request = new XMLHttpRequest();

    request.onreadystatechange=function(){
        if(request.readyState===XMLHttpRequest.DONE && request.status ===200){
            var data = JSON.parse(request.responseText);
            console.log(data);
        }
    };

    var username = document.getElementById('username').value;
    var password = document.getElementById('password').value;
    request.open('POST','http://localhost:8080/create-user',true);
    request.send(JSON.stringify({username:username,password:password}));
};

这是我收到的错误消息

TypeError: Not a buffer
   at TypeError (native)
   at pbkdf2 (crypto.js:562:20)
   at Object.exports.pbkdf2Sync (crypto.js:553:10)
   at hash (D:\imadtw\server.js:119:23)
   at D:\imadtw\server.js:129:18
   at Layer.handle [as handle_request] (D:\imadtw\node_modules\express\lib\router\layer.js:95:5)
   at next (D:\imadtw\node_modules\express\lib\router\route.js:131:13)
   at Route.dispatch (D:\imadtw\node_modules\express\lib\router\route.js:112:3)
   at Layer.handle [as handle_request] (D:\imadtw\node_modules\express\lib\router\layer.js:95:5)
   at D:\imadtw\node_modules\express\lib\router\index.js:277:22
   at Function.process_params (D:\imadtw\node_modules\express\lib\router\index.js:330:12)
   at next (D:\imadtw\node_modules\express\lib\router\index.js:271:10)
   at jsonParser (D:\imadtw\node_modules\body-parser\lib\types\json.js:112:7)
   at Layer.handle [as handle_request] (D:\imadtw\node_modules\express\lib\router\layer.js:95:5)
   at trim_prefix (D:\imadtw\node_modules\express\lib\router\index.js:312:13)
   at D:\imadtw\node_modules\express\lib\router\index.js:280:7

编辑：我刚试了一下。这个过程工作正常，当我硬编码用户名和密码的值（就像一个实验），但当我尝试使用req.body获取用户名和密码的值时它不起作用似乎从身体获取价值是这里的难点。

这是我希望从

输入值的页面的html

<!doctype html>
<html lang="en">
<head>

<meta name="viewport" content="width=device-width, initial-scale=1">  

<!-- jQuery library -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>

<!-- Latest compiled JavaScript -->
<script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>

<!-- Latest compiled and minified CSS -->
<link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">

<!-- Fontawesome library -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.6.3/css/font-awesome.min.css">



<link rel="stylesheet" type="text/css" href="/ui/profile.css">
<script type="text/javascript" src="/ui/main.js" ></script>
</head>

<body>
 <!--Navbar Begins    -->
  <nav class="navbar navbar-fixed-top scrolltop" id="navigation">
    <div class="container">
      <!-- navbar header begins   -->
      <div class="navbar-header">
        <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar-collapse">
 <span class="sr-only">Toggle Navigation</span>
 <span class="icon-bar"></span>
 <span class="icon-bar"></span>
 <span class="icon-bar"></span>
  </button>
        <a class="navbar-brand" href="#">Faraz Ahmed</a>

      </div>
      <!-- navbar header ends -->

      <!-- div collapse begins -->
      <div class="collapse navbar-collapse" id="navbar-collapse">
        <ul class="nav navbar-nav navbar-right">
          <li class="active"><a href="#aboutme">About</a></li>
          <li><a href="#portfolioz">Portfolio</a></li>
          <li><a href="#contactme">Contact</a></li>
        </ul>
      </div>
      <!-- div collapse ends -->
    </div>
    <!-- container ends -->
  </nav>
  <!--Navbar ends    -->

  <div class="container-fluid">
    <div class="row" id="fullBody">


      <div class=" col-md-12 col-sm-12 col-xs-12" id="column-main">
        <div id="aboutme" class="about">
      <div class="row">

        <div class="col-lg-12 col-md-12 col-sm-12">
          <div id="img"><img class="img-responsive"  src="http://res.cloudinary.com/whizzy/image/upload/v1454699647/faraz_qwdqrx.jpg" alt=""></div>

         <!-- <hr class="hr1"><i class="fa fa-star"></i><hr class="hr2"> -->

          <p class="aboutpara scrollz"></br>I am a self taught web developer who has learnt html,css, Javascript,Jquery and bootstrap too. I keep building websites and other apps to practice what I have learnt. This site is responsive. Go ahead and take a look at it in your mobile and see how they adjust to your screen size.</p>
        </div>
      </div>
    </div><!-- aboutme div ends -->

  <div class="user">

 <p>
  <form method="post" action="/create-user" >
  <input type="text" id="username" placeholder="username">
  <input type="password" id="password" name="password">
  <input type="submit" id="submit_btn" value="Submit" class="btn btn-warning">
</form>
 </p>

<ul id="namelist">


</ul>




  </div><!-- requestz div ends -->

<div id='twitterDiv' class="row">
  <div class="col-lg-12 col-md-12 col-sm-12">
  <h3>Tweets Here</h3>
  <input type="text" id="tweetSearch" placeholder="enter keyword to search for"></input>
  <button id="tweetButton" type="submit">Submit</button>
<p id="tweetz">tweets appear here</p>

</div><!--column ends -->
</div><!--row ends -->

      </div><!--2nd column ends -->



    </div><!-- main row ends -->





    </div><!-- container-fluid div ends -->
</body>

</html>

Answer 1

确保您正在设置正确的正文内容类型：

request.open('POST','http://localhost:8080/create-user',true);
request.setRequestHeader('content-type', 'application/json');
request.send(JSON.stringify({username:username,password:password}));

Answer 2

根据您的html，您没有为用户名字段设置name属性。这意味着在提交html表单时（与XHR分开），该字段不会被发送到服务器。

编辑：这可能与pbkdf2Sync()的特定问题无关，因为它不考虑用户名值。

快递js节点没有缓冲区错误

2 个答案: