if (typeof (module) !== 'undefined' && typeof (exports) !== 'undefined') {
module.exports = OAuth;
var CryptoJS = require("crypto-js");
}
/**
* Constructor
* @param {Object} opts consumer key and secret
*/
function OAuth(opts) {
if (!(this instanceof OAuth)) {
return new OAuth(opts);
}
if (!opts) {
opts = {};
}
if (!opts.consumer) {
throw new Error('consumer option is required');
}
this.consumer = opts.consumer;
this.signature_method = opts.signature_method || 'HMAC-SHA1';
this.nonce_length = opts.nonce_length || 32;
this.version = opts.version || '1.0';
this.parameter_seperator = opts.parameter_seperator || ', ';
if (typeof opts.last_ampersand === 'undefined') {
this.last_ampersand = true;
} else {
this.last_ampersand = opts.last_ampersand;
}
switch (this.signature_method) {
case 'HMAC-SHA1':
this.hash = function (base_string, key) {
return CryptoJS.HmacSHA1(base_string, key).toString(CryptoJS.enc.Base64);
};
break;
case 'HMAC-SHA256':
this.hash = function (base_string, key) {
return CryptoJS.HmacSHA256(base_string, key).toString(CryptoJS.enc.Base64);
};
break;
case 'PLAINTEXT':
this.hash = function (base_string, key) {
return key;
};
break;
case 'RSA-SHA1':
throw new Error('oauth-1.0a does not support this signature method right now. Coming Soon...');
default:
throw new Error('The OAuth 1.0a protocol defines three signature methods: HMAC-SHA1, RSA-SHA1, and PLAINTEXT only');
}
}
/**
* OAuth request authorize
* @param {Object} request data
* {
* method,
* url,
* data
* }
* @param {Object} public and secret token
* @return {Object} OAuth Authorized data
*/
OAuth.prototype.authorize = function (request, token) {
var oauth_data = {
oauth_callback: 'about:blank', // added by sourabh
oauth_consumer_key: this.consumer.public,
oauth_nonce: this.getNonce(),
oauth_signature_method: this.signature_method,
oauth_timestamp: this.getTimeStamp(),
oauth_version: this.version
};
if (!token) {
token = {};
}
if (token.public) {
//oauth_data.oauth_token = token.public; // commented by sourabh
}
if (!request.data) {
request.data = {};
}
oauth_data.oauth_signature = this.getSignature(request, token.secret, oauth_data);
return oauth_data;
};
/**
* Create a OAuth Signature
* @param {Object} request data
* @param {Object} token_secret public and secret token
* @param {Object} oauth_data OAuth data
* @return {String} Signature
*/
OAuth.prototype.getSignature = function (request, token_secret, oauth_data) {
return this.hash(this.getBaseString(request, oauth_data), this.getSigningKey(token_secret));
};
/**
* Base String = Method + Base Url + ParameterString
* @param {Object} request data
* @param {Object} OAuth data
* @return {String} Base String
*/
OAuth.prototype.getBaseString = function (request, oauth_data) {
return request.method.toUpperCase() + '&' + this.percentEncode(this.getBaseUrl(request.url)) + '&' + this.percentEncode(this.getParameterString(request, oauth_data));
};
/**
* Get data from url
* -> merge with oauth data
* -> percent encode key & value
* -> sort
*
* @param {Object} request data
* @param {Object} OAuth data
* @return {Object} Parameter string data
*/
OAuth.prototype.getParameterString = function (request, oauth_data) {
var base_string_data = this.sortObject(this.percentEncodeData(this.mergeObject(oauth_data, this.mergeObject(request.data, this.deParamUrl(request.url)))));
var data_str = '';
//base_string_data to string
for (var key in base_string_data) {
data_str += key + '=' + base_string_data[key] + '&';
}
//remove the last character
data_str = data_str.substr(0, data_str.length - 1);
return data_str;
};
/**
* Create a Signing Key
* @param {String} token_secret Secret Token
* @return {String} Signing Key
*/
OAuth.prototype.getSigningKey = function (token_secret) {
token_secret = token_secret || '';
if (!this.last_ampersand && !token_secret) {
return this.percentEncode(this.consumer.secret);
}
// commented by Sourabh
//return this.percentEncode(this.consumer.secret) + '&' + this.percentEncode(token_secret);
return this.percentEncode(this.consumer.secret) + '&';
};
/**
* Get base url
* @param {String} url
* @return {String}
*/
OAuth.prototype.getBaseUrl = function (url) {
return url.split('?')[0];
};
/**
* Get data from String
* @param {String} string
* @return {Object}
*/
OAuth.prototype.deParam = function (string) {
var arr = decodeURIComponent(string).split('&');
var data = {};
for (var i = 0; i < arr.length; i++) {
var item = arr[i].split('=');
data[item[0]] = item[1];
}
return data;
};
/**
* Get data from url
* @param {String} url
* @return {Object}
*/
OAuth.prototype.deParamUrl = function (url) {
var tmp = url.split('?');
if (tmp.length === 1)
return {};
return this.deParam(tmp[1]);
};
/**
* Percent Encode
* @param {String} str
* @return {String} percent encoded string
*/
OAuth.prototype.percentEncode = function (str) {
return encodeURIComponent(str)
.replace(/\!/g, "%21")
.replace(/\*/g, "%2A")
.replace(/\'/g, "%27")
.replace(/\(/g, "%28")
.replace(/\)/g, "%29");
};
/**
* Percent Encode Object
* @param {Object} data
* @return {Object} percent encoded data
*/
OAuth.prototype.percentEncodeData = function (data) {
var result = {};
for (var key in data) {
result[this.percentEncode(key)] = this.percentEncode(data[key]);
}
return result;
};
/**
* Get OAuth data as Header
* @param {Object} oauth_data
* @return {String} Header data key - value
*/
OAuth.prototype.toHeader = function (oauth_data) {
oauth_data = this.sortObject(oauth_data);
var header_value = 'OAuth ';
for (var key in oauth_data) {
if (key.indexOf('oauth_') === -1)
continue;
header_value += this.percentEncode(key) + '="' + this.percentEncode(oauth_data[key]) + '"' + this.parameter_seperator;
}
return {
Authorization: header_value.substr(0, header_value.length - this.parameter_seperator.length) //cut the last chars
};
};
/**
* Create a random word characters string with input length
* @return {String} a random word characters string
*/
OAuth.prototype.getNonce = function () {
var word_characters = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
var result = '';
for (var i = 0; i < this.nonce_length; i++) {
result += word_characters[parseInt(Math.random() * word_characters.length, 10)];
}
return result;
};
/**
* Get Current Unix TimeStamp
* @return {Int} current unix timestamp
*/
OAuth.prototype.getTimeStamp = function () {
//return parseInt(new Date().getTime()/1000, 10);
// changed by sourabh
var now = new Date;
return utc_timestamp = Date.UTC(now.getUTCFullYear(), now.getUTCMonth(), now.getUTCDate(),
now.getUTCHours(), now.getUTCMinutes(), now.getUTCSeconds(), now.getUTCMilliseconds());
};
////////////////////// HELPER FUNCTIONS //////////////////////
/**
* Merge object
* @param {Object} obj1
* @param {Object} obj2
* @return {Object}
*/
OAuth.prototype.mergeObject = function (obj1, obj2) {
var merged_obj = obj1;
for (var key in obj2) {
merged_obj[key] = obj2[key];
}
return merged_obj;
};
/**
* Sort object by key
* @param {Object} data
* @return {Object} sorted object
*/
OAuth.prototype.sortObject = function (data) {
var keys = Object.keys(data);
var result = {};
keys.sort();
for (var i = 0; i < keys.length; i++) {
var key = keys[i];
result[key] = data[key];
}
return result;
};
