Node.js JSON解析错误 [英] Node.js JSON parsing error

问题描述

我正在尝试用node.js制作一个Facebook应用程序，但是我在检查签名请求时遇到麻烦。每次我提出请求时，程序都会抛出一个 SyntaxError：Unexpected token ILLEGAL ：

 未定义：1 
：721599476} 
 ^^ 
语法错误：意外的标记ILLEGAL 
  

罪魁祸首的功能如下：

  function parse_signed_request（signed_request，secret）{
 encoded_data = signed_request.split（'。'，2）; 
 //解码数据
 sig = encoded_data [0]; 
 json = base64url.decode（encoded_data [1]）; 
 data = JSON.parse（json）; // ERROR在这里发生！
 
 //检查算法 - 与错误无关
 if（！data.algorithm || data.algorithm。 toUpperCase（）！='HMAC-SHA256'）{
 console.error（'未知算法，预期HMAC-SHA256'）; 
返回null; 
} 
 
 //检查sig  - 与错误无关
 expected_sig = crypto.createHmac（'sha256'，secret）.update（encoded_data [ 。1]）消化（的base64’ ）代替（/ \ + /克，  - ）代替（/ \ //克， _）代替（ =，）。;。 
 if（sig！== expected_sig）{
 console.error（'Bad signed JSON Signature！'）; 
返回null; 
} 
 
返回数据; 
} 
  

只是为了测试，一个有效的signed_request将是

'pre> WGvK-mUKB_Utg0l8gSPvf6smzacp46977pTtcRx0puE.eyJhbGdvcml0aG0iOiJITUFDLVNIQTI1NiIsImV4cGlyZXMiOjEyOTI4MjEyMDAsImlzc3VlZF9hdCI6MTI5MjgxNDgyMCwib2F1dGhfdG9rZW4iOiIxNTI1NDk2ODQ3NzczMDJ8Mi5ZV2NxV2k2T0k0U0h4Y2JwTWJRaDdBX18uMzYwMC4xMjkyODIxMjAwLTcyMTU5OTQ3NnxQaDRmb2t6S1IyamozQWlxVldqNXp2cTBmeFEiLCJ1c2VyIjp7ImxvY2FsZSI6ImVuX0dCIiwiY291bnRyeSI6ImF1In0sInVzZXJfaWQiOiI3MjE1OTk0NzYifQ


为什么在有效的JSON时收到此错误，只需使用JSON的静态字符串即可正常工作，并且有任何技巧可以解决此问题吗？

谢谢。

解决方案

好的，经过一番测试，我自己解决了这个问题，对于浪费的问题抱歉。

我的base64库中的某些东西没有正确地解码字符串（虽然它似乎是 - 所以它一定是一个非显示的字符cter或padding等）

我已经转换为 https://github.com/kriszyp/commonjs-utils/blob/master/lib/base64.js 适合我的目的，虽然需要修改支持base64url解码而不是正常的base64，现在似乎工作正常。

I am attempting to make a Facebook application with node.js, however I'm having trouble in checking signed requests. Every time I make a request, the program throws a SyntaxError: Unexpected token ILLEGAL as such:

undefined:1
":"721599476"}
              ^^
SyntaxError: Unexpected token ILLEGAL

The culprit function is below:

function parse_signed_request(signed_request, secret) {
    encoded_data = signed_request.split('.',2);
    // decode the data
    sig = encoded_data[0];
    json = base64url.decode(encoded_data[1]);
    data = JSON.parse(json); // ERROR Occurs Here!

    // check algorithm - not relevant to error
    if (!data.algorithm || data.algorithm.toUpperCase() != 'HMAC-SHA256') {
        console.error('Unknown algorithm. Expected HMAC-SHA256');
        return null;
    }

    // check sig - not relevant to error
    expected_sig = crypto.createHmac('sha256',secret).update(encoded_data[1]).digest('base64').replace(/\+/g,'-').replace(/\//g,'_').replace('=','');
    if (sig !== expected_sig) {
        console.error('Bad signed JSON Signature!');
        return null;
    }

    return data;
}

Just for testing, a valid signed_request would be

WGvK-mUKB_Utg0l8gSPvf6smzacp46977pTtcRx0puE.eyJhbGdvcml0aG0iOiJITUFDLVNIQTI1NiIsImV4cGlyZXMiOjEyOTI4MjEyMDAsImlzc3VlZF9hdCI6MTI5MjgxNDgyMCwib2F1dGhfdG9rZW4iOiIxNTI1NDk2ODQ3NzczMDJ8Mi5ZV2NxV2k2T0k0U0h4Y2JwTWJRaDdBX18uMzYwMC4xMjkyODIxMjAwLTcyMTU5OTQ3NnxQaDRmb2t6S1IyamozQWlxVldqNXp2cTBmeFEiLCJ1c2VyIjp7ImxvY2FsZSI6ImVuX0dCIiwiY291bnRyeSI6ImF1In0sInVzZXJfaWQiOiI3MjE1OTk0NzYifQ

Why am I getting this error when it is valid JSON and simply using a static string of JSON will work fine, and are there any tips to fix this?

Thanks.

解决方案

Ok, after a bit of testing I've fixed the problem myself, sorry for the wasted question.

Something in my base64 library wasn't decoding the string properly (although it appeared to be - so it must have been a non-displaying character or padding, etc.)

I've changed over to https://github.com/kriszyp/commonjs-utils/blob/master/lib/base64.js which suits my purposes, although needed to be modified to support base64url decoding rather than normal base64, and it seems to work fine now.

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