googlscript-twitter-oauth.js

//-----------------------------------
// Authenticate and Connect to OAuth Service
// Created By: Russ Savage
// FreeAdWordsScripts.com
//-----------------------------------
function main() {
  //Define the Twitter Keys and Secrets
  //More info on obtaining these can be found at https://dev.twitter.com/docs/auth/tokens-devtwittercom
  var oauth_key_stuff = {
    "consumer_key" : "your consumer key",
    "consumer_secret" : "your consumer secret",
    "access_token" : "your access token",
    "access_token_secret" : "your access token secret"
  };
 
  // Update this with the REST url you want to call.  I only tested it with GET
  // but i don't think there is anything stopping a POST request from working.
  var url_stuff = {  
    "http_method" : 'GET',
    "base_url" : "https://api.twitter.com/1.1/statuses/user_timeline.json"
  };
 
  //Add the parameters for the REST url you want to call.
  var url_param_stuff = {
    "screen_name" : "russellsavage" //hey that's me!
  };
   
  // Don't touch this stuff
  var other_oauth_data = {
    "oauth_nonce" : Utilities.base64Encode(Math.random() +
          "secret_sauce" +
          (new Date()).getTime()).replace(/(?!\w)/g, ''),
    "oauth_signature_method" : "HMAC-SHA1",
    "oauth_timestamp" : Math.round((new Date()).getTime() / 1000.0),
    "oauth_version" : "1.0"
  };
   
  // Here is where the magic happens
  var auth_string = _build_authorization_string(oauth_key_stuff,url_stuff,url_param_stuff,other_oauth_data);
 
  var options = {
    "headers" : { "Authorization" :  auth_string }
  };
     
  var url = _build_url(url_stuff,url_param_stuff);
  var response = UrlFetchApp.fetch(url, options);
  var tweets = JSON.parse(response.getContentText());
   
  //now let's log my amazing tweets!
  for(var tweet in tweets) {
    var t = tweets[tweet];
    Logger.log(t.text);
  }
  
  // HELPER FUNCTIONS BELOW
   
  function _build_url(base_url,param_stuff){
    var url = base_url.base_url;
    if(param_stuff != {}) {
      url += '?';
    }
    for(var key in param_stuff) {
      url += key + "=";
      url += encodeURIComponent(param_stuff[key]);
      url += '&';
    }
    return url.slice(0,-1);
  }
   
  function _build_param_string(auth_keys,url_data,oauth_data) {
    var data_for_param_string = {
      "oauth_consumer_key" : auth_keys.consumer_key,
      "oauth_nonce" : oauth_data.oauth_nonce,
      "oauth_signature_method" : oauth_data.oauth_signature_method,
      "oauth_timestamp" : oauth_data.oauth_timestamp,
      "oauth_token" : auth_keys.access_token,
      "oauth_version" : oauth_data.oauth_version
    };
     
    // add additional url values
    for(var my_key in url_data) { 
      data_for_param_string[my_key] = url_data[my_key]; 
    }
     
    // find and sort the keys for later
    var keys = [];
    for(var key in data_for_param_string) {
      keys.push(key);
    }
    keys.sort();
     
    //finally build and return the param string
    var param_string = "";
    for(var i in keys) {
      param_string += keys[i] + "=" + encodeURIComponent(data_for_param_string[keys[i]]);
      if(i < keys.length - 1) {
        param_string += "&";
      }
    }
     
    return param_string;
  }
   
  function _build_sig_base_string(my_url_stuff,my_param_string) {
    return my_url_stuff.http_method +
      "&" + encodeURIComponent(my_url_stuff.base_url) +
      "&" + encodeURIComponent(my_param_string);
  }
   
  function _build_sigining_key(my_key_stuff) {
    return encodeURIComponent(my_key_stuff.consumer_secret) + 
      "&" + encodeURIComponent(my_key_stuff.access_token_secret);
  }
   
  function _build_oauth_signature(base_string,sign) {
    return Utilities.base64Encode(
      Utilities.computeHmacSignature(
        Utilities.MacAlgorithm.HMAC_SHA_1, 
        base_string, 
        sign
      )
    );
  }
   
  function _build_authorization_string(my_key_stuff,my_url_stuff,my_url_param_stuff,my_oauth_stuff) {
    var param_string = _build_param_string(my_key_stuff,my_url_param_stuff,my_oauth_stuff);
    var sig_base_string = _build_sig_base_string(my_url_stuff,param_string);
    var signing_key = _build_sigining_key(my_key_stuff);
    var oauth_signature = _build_oauth_signature(sig_base_string,signing_key);
    return "OAuth " +
           encodeURIComponent("oauth_consumer_key") + '="' + 
             encodeURIComponent(my_key_stuff.consumer_key) + '", ' +
           encodeURIComponent("oauth_nonce") + '="' + 
             encodeURIComponent(my_oauth_stuff.oauth_nonce) + '", ' +
           encodeURIComponent("oauth_signature") + '="' + 
             encodeURIComponent(oauth_signature) + '", ' +
           encodeURIComponent("oauth_signature_method") + '="' + 
             encodeURIComponent(my_oauth_stuff.oauth_signature_method) + '", ' +
           encodeURIComponent("oauth_timestamp") + '="' + 
             encodeURIComponent(my_oauth_stuff.oauth_timestamp) + '", ' +
           encodeURIComponent("oauth_token") + '="' + 
             encodeURIComponent(my_key_stuff.access_token) + '", ' +
           encodeURIComponent("oauth_version") + '="' + 
             encodeURIComponent(my_oauth_stuff.oauth_version) + '"';
     
  }
   
}