在Node.js（Express）Facebook画布应用程序中获取signed_request [英] Get signed_request in Node.js (Express) Facebook canvas app

问题描述

有没有办法在Node.js的Facebook页面标签应用程序中获取和解析signed_request？我需要知道页面ID，如果用户喜欢的页面...

解决方案

我这样做了一段时间，结束了写一个小图书馆来做。原始的CoffeeScript可以在 https://gist.github.com/fbef51815ab6f062b51a#file_signed_request.coffee找到，这里是一个JavaScript翻译：

  var crypto = require（'crypto'）; 
 
 SignedRequest =（function（）{
 
 function SignedRequest（secret，request）{
 this.secret = secret; 
 this.request = request ; 
 this.verify = this.verify.bind（this）; 
 
 var parts = this.request.split（'。'）; 
 this.encodedSignature = parts [ 0]; 
 this.encoded = parts [1]; 
 this.signature = this.base64decode（this.encodedSignature）; 
 this.decoded = this.base64decode（this.encoded）; 
 this.data = JSON.parse（this.decoded）; 
} 
 
 SignedRequest.prototype.verify = function（）{
 if（this.data。算法！=='HMAC-SHA256'）{
 return false; 
} 
 var hmac = crypto.createHmac（'SHA256'，this.secret）; 
 hmac.update （this.encoded）; 
 var result = hmac.digest（'base64'）。replace（/ \ // g，'_'）。replace（/ \ + / g，' - '）。替换（/ \ = / g，''）; 
返回结果=== this.encodedSignature; 
}; 
 
 SignedRequest.pr ototype.base64encode = function（data）{
 return new Buffer（data，'utf8'）。toString（'base64'）。replace（/ \ // g，'_'）replace（/ \ + / g，' - '）。replace（/ \ = / g，''）; 
}; 
 
 SignedRequest.prototype.base64decode = function（data）{
 while（data.length％4！== 0）{
 data + ='='; 
} 
 data = data.replace（/  -  / g，'+'）。replace（/ _ / g，'/'）; 
 return new Buffer（data，'base64'）。toString（'utf-8'）; 
}; 
 
 return SignedRequest; 
 
}）（）; 
 
 module.exports = SignedRequest; 
  

您可以使用这样的方式：

  var verifier = new SignedRequest（clientSecret，signedRequest）; 
 verifier.verify（）//签名请求是否验证
 verifier.data //签名请求中的数据
  

is there any way how to get and parse signed_request in Node.js Facebook page tab app? I need to know page id and if user liked the page...

解决方案

I did this a little while ago, and ended up writing a small library to do it. The original CoffeeScript can be found at https://gist.github.com/fbef51815ab6f062b51a#file_signed_request.coffee, here is a JavaScript translation:

var crypto = require('crypto');

SignedRequest = (function() {

  function SignedRequest(secret, request) {
    this.secret = secret;
    this.request = request;
    this.verify = this.verify.bind(this);

    var parts = this.request.split('.');
    this.encodedSignature = parts[0];
    this.encoded = parts[1];
    this.signature = this.base64decode(this.encodedSignature);
    this.decoded = this.base64decode(this.encoded);
    this.data = JSON.parse(this.decoded);
  }

  SignedRequest.prototype.verify = function() {
    if (this.data.algorithm !== 'HMAC-SHA256') {
      return false;
    }
    var hmac = crypto.createHmac('SHA256', this.secret);
    hmac.update(this.encoded);
    var result = hmac.digest('base64').replace(/\//g, '_').replace(/\+/g, '-').replace(/\=/g, '');
    return result === this.encodedSignature;
  };

  SignedRequest.prototype.base64encode = function(data) {
    return new Buffer(data, 'utf8').toString('base64').replace(/\//g, '_').replace(/\+/g, '-').replace(/\=/g, '');
  };

  SignedRequest.prototype.base64decode = function(data) {
    while (data.length % 4 !== 0) {
      data += '=';
    }
    data = data.replace(/-/g, '+').replace(/_/g, '/');
    return new Buffer(data, 'base64').toString('utf-8');
  };

  return SignedRequest;

})();

module.exports = SignedRequest;

Which you can use like this:

var verifier = new SignedRequest(clientSecret, signedRequest);
verifier.verify() // whether or not the signed request verifies
verifier.data // the data from the signed request

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