javascript Node.js JSON 解析错误
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Node.js JSON parsing error
提问by Adam M-W
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 ILLEGALas such:
我正在尝试使用 node.js 制作 Facebook 应用程序，但是在检查签名请求时遇到问题。每次我发出请求时，程序都会抛出一个SyntaxError: Unexpected token ILLEGAL如下：
undefined:1
":"721599476"}
^^
SyntaxError: Unexpected token ILLEGAL
The culprit function is below:
罪魁祸首函数如下：
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
仅用于测试，有效的 signed_request 将是
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?
当它是有效的 JSON 时，为什么我会收到此错误并且仅使用静态 JSON 字符串就可以正常工作，是否有任何提示可以解决此问题？
Thanks.
谢谢。
采纳答案by Adam M-W
Ok, after a bit of testing I've fixed the problem myself, sorry for the wasted question.
好的，经过一些测试后，我自己解决了问题，对于浪费的问题感到抱歉。
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.)
我的 base64 库中的某些内容没有正确解码字符串（尽管它看起来是 - 所以它一定是一个不显示的字符或填充等）
I've changed over to https://github.com/kriszyp/commonjs-utils/blob/master/lib/base64.jswhich suits my purposes, although needed to be modified to support base64url decoding rather than normal base64, and it seems to work fine now.
我已经改用https://github.com/kriszyp/commonjs-utils/blob/master/lib/base64.js这符合我的目的，虽然需要修改以支持 base64url 解码而不是普通的 base64，并且它现在似乎工作正常。
