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Allow creating instances #83

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151 changes: 91 additions & 60 deletions lib/graph.js
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Original file line number Diff line number Diff line change
Expand Up @@ -29,42 +29,46 @@ function extend(target) {
* @private
*/

var accessToken = null
, appSecret = null
, graphUrl = 'https://graph.facebook.com'
, graphVersion = '2.0' // default to the oldest version
, oauthDialogUrl = "http://www.facebook.com/v2.0/dialog/oauth?" // oldest version for auth
, oauthDialogUrlMobile = "http://m.facebook.com/v2.0/dialog/oauth?" // oldest version for auth
, requestOptions = {};
//var accessToken = null
// , appSecret = null
// , graphUrl = 'https://graph.facebook.com'
// , graphVersion = '2.0' // default to the oldest version
// , oauthDialogUrl = "http://www.facebook.com/v2.0/dialog/oauth?" // oldest version for auth
// , oauthDialogUrlMobile = "http://m.facebook.com/v2.0/dialog/oauth?" // oldest version for auth
// , requestOptions = {};

/**
* Library version
*/

exports.version = '0.3.0';
Client.prototype.version = '0.3.0';

/**
* Graph Stream
*
* @param {String} method
* @param {String} url
* @param {object/function} - postData
* @param {object/function} postData
* - object to be used for post
* - assumed to be a callback function if callback is undefined
* @param {function/undefined} - callback function
* @param {function/undefined} callback function
* @param {Client} client fbgraph client
*/

function Graph(method, url, postData, callback) {
if (typeof callback === 'undefined') {
callback = postData;
postData = {};
function Graph(method, url, postData, callback, client) {
if (typeof client === 'undefined') {
client = callback;
callback = postData;
postData = {};
}

this.client = client;

url = this.prepareUrl(url);
this.callback = callback || noop;
this.postData = postData;

this.options = extend({}, requestOptions);
this.options = extend({}, this.client.requestOptions);
this.options.encoding = this.options.encoding || 'utf-8';

// these particular set of options should be immutable
Expand All @@ -87,7 +91,7 @@ Graph.prototype.prepareUrl = function(url) {
url = this.cleanUrl(url);

if (url.substr(0,4) !== 'http') {
url = graphUrl + '/v' + graphVersion + url;
url = this.client.graphUrl + '/v' + this.client.graphVersion + url;
}

return url;
Expand All @@ -107,20 +111,20 @@ Graph.prototype.cleanUrl = function(url) {
// prep access token in url for appsecret proofing
var regex = /access_token=([^&]*)/;
var results = regex.exec(url);
var sessionAccessToken = results ? results[1] : accessToken;
var sessionAccessToken = results ? results[1] : this.client.accessToken;

// add leading slash
if (url.charAt(0) !== '/' && url.substr(0,4) !== 'http') url = '/' + url;

// add access token to url
if (accessToken && url.indexOf('access_token=') === -1) {
if (this.client.accessToken && url.indexOf('access_token=') === -1) {
url += ~url.indexOf('?') ? '&' : '?';
url += "access_token=" + accessToken;
url += "access_token=" + this.client.accessToken;
}

// add appsecret_proof to the url
if (sessionAccessToken && appSecret && url.indexOf('appsecret_proof') === -1) {
var hmac = crypto.createHmac('sha256', appSecret);
if (sessionAccessToken && this.client.appSecret && url.indexOf('appsecret_proof') === -1) {
var hmac = crypto.createHmac('sha256', this.client.appSecret);
hmac.update(sessionAccessToken);

url += ~url.indexOf('?') ? '&' : '?';
Expand Down Expand Up @@ -226,6 +230,24 @@ Graph.prototype.post = function() {

};

function Client(){
}
Client.prototype.constructor = Client;

var defaultClient = Object.create(Client.prototype);
defaultClient.accessToken = null;
defaultClient.appSecret = null;
defaultClient.graphUrl = 'https://graph.facebook.com';
defaultClient.graphVersion = '2.0'; // default to the oldest version
defaultClient.oauthDialogUrl = "http://www.facebook.com/v2.0/dialog/oauth?"; // oldest version for auth
defaultClient.oauthDialogUrlMobile = "http://m.facebook.com/v2.0/dialog/oauth?"; // oldest version for auth
defaultClient.requestOptions = {};

/**
* @type {Client}
*/
module.exports = defaultClient;

/**
* Accepts an url an returns facebook
* json data to the callback provided
Expand Down Expand Up @@ -261,7 +283,7 @@ Graph.prototype.post = function() {
* @param {function} callback
*/

exports.get = function(url, params, callback) {
Client.prototype.get = function(url, params, callback) {
if (typeof params === 'function') {
callback = params;
params = null;
Expand All @@ -276,7 +298,7 @@ exports.get = function(url, params, callback) {
url += qs.stringify(params);
}

return new Graph('GET', url, callback);
return new Graph('GET', url, callback, this);
};

/**
Expand All @@ -292,17 +314,17 @@ exports.get = function(url, params, callback) {
* @param {function} callback
*/

exports.post = function (url, postData, callback) {
Client.prototype.post = function (url, postData, callback) {
if (typeof url !== 'string') {
return callback({ message: 'Graph api url must be a string' }, null);
}

if (typeof postData === 'function') {
callback = postData;
postData = url.indexOf('access_token') !== -1 ? {} : {access_token: accessToken};
postData = url.indexOf('access_token') !== -1 ? {} : {access_token: this.accessToken};
}

return new Graph('POST', url, postData, callback);
return new Graph('POST', url, postData, callback, this);
};

/**
Expand All @@ -315,15 +337,15 @@ exports.post = function (url, postData, callback) {
* @param {function} callback
*/

exports.del = function (url, postData, callback) {
Client.prototype.del = function (url, postData, callback) {
if (!url.match(/[?|&]method=delete/i)) {
url += ~url.indexOf('?') ? '&' : '?';
url += 'method=delete';
}

if (typeof postData === 'function') {
callback = postData;
postData = url.indexOf('access_token') !== -1 ? {} : {access_token: accessToken};
postData = url.indexOf('access_token') !== -1 ? {} : {access_token: this.accessToken};
}

this.post(url, postData, callback);
Expand All @@ -337,23 +359,23 @@ exports.del = function (url, postData, callback) {
* @param {function} callback
*/

exports.search = function (options, callback) {
Client.prototype.search = function (options, callback) {
options = options || {};
var url = '/search?' + qs.stringify(options);
return this.get(url, callback);
};

/**
* Perform a batch query on the graph api
*
*
* @param {Array} reqs An array containing queries
* @param {[Object]} additionalData Additional data to send, e.g. attachments or the `include_headers` parameter.
* @param {Function} callback
*
* @see https://developers.facebook.com/docs/graph-api/making-multiple-requests
*/

exports.batch = function (reqs, additionalData, callback) {
Client.prototype.batch = function (reqs, additionalData, callback) {
if (!(reqs instanceof Array)) {
return callback({ message: 'Graph api batch requests must be an array' }, null);
}
Expand All @@ -364,9 +386,9 @@ exports.batch = function (reqs, additionalData, callback) {
}

return new Graph('POST', '', extend({}, {
access_token: accessToken,
access_token: this.accessToken,
batch: JSON.stringify(reqs)
}, additionalData), callback);
}, additionalData), callback, this);
};


Expand All @@ -384,7 +406,7 @@ exports.batch = function (reqs, additionalData, callback) {
* @param {object} params
* @param {function} callback
*/
exports.fql = function (query, params, callback) {
Client.prototype.fql = function (query, params, callback) {
if (typeof query !== 'string') query = JSON.stringify(query);

var url = '/fql?q=' + encodeURIComponent(query);
Expand All @@ -406,8 +428,8 @@ exports.fql = function (query, params, callback) {
* @param {object} opts Options hash. { mobile: true } will return mobile oAuth URL
* @returns the oAuthDialogUrl based on params
*/
exports.getOauthUrl = function (params, opts) {
var url = (opts && opts.mobile) ? oauthDialogUrlMobile : oauthDialogUrl;
Client.prototype.getOauthUrl = function (params, opts) {
var url = (opts && opts.mobile) ? this.oauthDialogUrlMobile : this.oauthDialogUrl;
return url + qs.stringify(params);
};

Expand All @@ -423,7 +445,7 @@ exports.getOauthUrl = function (params, opts) {
* @param {function} callback
*/

exports.authorize = function (params, callback) {
Client.prototype.authorize = function (params, callback) {
var self = this;

this.get("/oauth/access_token", params, function(err, res) {
Expand All @@ -443,7 +465,7 @@ exports.authorize = function (params, callback) {
* @param {function} callback
*/

exports.extendAccessToken = function (params, callback) {
Client.prototype.extendAccessToken = function (params, callback) {
var self = this;

params.grant_type = 'fb_exchange_token';
Expand All @@ -465,8 +487,8 @@ exports.extendAccessToken = function (params, callback) {
* @param {Object} options
*/

exports.setOptions = function (options) {
if (typeof options === 'object') requestOptions = options;
Client.prototype.setOptions = function (options) {
if (typeof options === 'object') this.requestOptions = options;

return this;
};
Expand All @@ -475,41 +497,41 @@ exports.setOptions = function (options) {
* @returns the request options object
*/

exports.getOptions = function() {
return requestOptions;
Client.prototype.getOptions = function() {
return this.requestOptions;
};

/**
* Sets the access token
* @param {string} token
*/

exports.setAccessToken = function(token) {
accessToken = token;
Client.prototype.setAccessToken = function(token) {
this.accessToken = token;
return this;
};

/**
* @returns the access token
*/

exports.getAccessToken = function () {
return accessToken;
Client.prototype.getAccessToken = function () {
return this.accessToken;
};

/**
* Set's the Graph API version.
* Note that you don't need to specify the 'v', just
* Set's the Graph API version.
* Note that you don't need to specify the 'v', just
* add '2.1', '1.1' etc
* @param {string} version
*/
exports.setVersion = function (version) {
Client.prototype.setVersion = function (version) {
// set version
graphVersion = version;
this.graphVersion = version;

// update auth urls
oauthDialogUrl = "http://www.facebook.com/v"+version+"/dialog/oauth?"; // oldest version for auth
oauthDialogUrlMobile = "http://m.facebook.com/v"+version+"/dialog/oauth?"; // oldest version for auth
this.oauthDialogUrl = "http://www.facebook.com/v"+version+"/dialog/oauth?"; // oldest version for auth
this.oauthDialogUrlMobile = "http://m.facebook.com/v"+version+"/dialog/oauth?"; // oldest version for auth

return this;
};
Expand All @@ -520,32 +542,41 @@ exports.setVersion = function (version) {
* @param {string} token
*/

exports.setAppSecret = function(token) {
appSecret = token;
Client.prototype.setAppSecret = function(token) {
this.appSecret = token;
return this;
};

/**
* @returns the app secret
*/

exports.getAppSecret = function () {
return appSecret;
Client.prototype.getAppSecret = function () {
return this.appSecret;
};

/**
* sets graph url
*/

exports.setGraphUrl = function (url) {
graphUrl = url;
Client.prototype.setGraphUrl = function (url) {
this.graphUrl = url;
return this;
};

/**
* @returns the graphUrl
*/

exports.getGraphUrl = function() {
return graphUrl;
Client.prototype.getGraphUrl = function() {
return this.graphUrl;
};

/**
* @returns {Client} a client inheriting from this one
*/

Client.prototype.createClient = function() {
return Object.create(this);
};