FB API integration

gistfile1.js

if(typeof A === 'undefined') {
    A = {};
}
A.FB = (function () {
    var fbLoaded = false,
        fbUserID, fbUserObject, fbUserToken;
    return {
        init: function () {
            // Load the SDK Asynchronously
            (function (d) {
                var js, id = 'facebook-jssdk';
                if(d.getElementById(id)) {
                    return;
                }
                js = d.createElement('script');
                js.id = id;
                js.async = true;
                js.src = "//connect.facebook.net/en_US/all.js";
                d.getElementsByTagName('head')[0].appendChild(js);
            }(document));
        },
        setLoaded: function (status) {
            fbLoaded = status;
        },
        setUserId: function (id) {
            fbUserID = id;
        },
        getUserId: function () {
            return fbUserID;
        },
        setUserObject: function (object) {
            fbUserObject = object;
        },
        getUserObject: function () {
            return fbUserObject;
        },
        setUserToken: function (token) {
            fbUserToken = token;
        },
        getUserToken: function () {
            return fbUserToken;
        },
        FBauthorize: function (url) {
            // url needs redirect_uri and scope
            if(A.mobile) {
                window.location = "https://m.facebook.com/dialog/oauth?response_type=token&client_id=" + A.config.appId + "&" + url + "&scope=" + A.config.fb_permissions;
                return;
            }
            window.location = "https://www.facebook.com/dialog/oauth?response_type=token&client_id=" + A.config.appId + "&" + url + "&scope=" + A.config.fb_permissions;
        },
        FBGraphMe: function (token) {
            this.setUserToken(token);
            var script = document.createElement('script');
            script.src = "https://graph.facebook.com/me?callback=A.FB.FBGraphMeCallback&access_token=" + token;
            document.body.appendChild(script);
        },
        FBGraphMeCallback: function (data) {
            if(data.error) {
                return;
            }
            A.FB.setUserId(data.id);
            A.FB.setUserObject(data);
        },
        FBCheckLogin: function (perms) {
            FB.getLoginStatus(function (response) {
                if(response.authResponse) {
                    // logged in and connected user, someone you know
                    A.FB.setUserId(response.authResponse.userID);
                } else {
                    // no user session available, someone you don't know
                    A.FB.FBLogIn(perms);
                }
            });
        },
        FBLogIn: function (perms) {
            FB.login(function (response) { //redirect-url,page
                if(response.authResponse) {
                    A.FB.setUserId(response.authResponse.userID);
                } else {
                    A.FB.setUserId("unknown");
                }
            }, {
                scope: perms
            });
        },
        FBUserQuery: function (method, queryparameter, fn) {
            //http://developers.facebook.com/docs/reference/api/user/
            FB.api({
                method: method,
                query: 'SELECT ' + queryparameter + ' FROM user WHERE uid = ' + fbUserID
            }, function (response) {
                A.FB.setUserObject(response[0]);
                fn(response);
            });
        },
        FBUserWallPost: function (name, link, picture, description, caption, message) {
            FB.api('/me/feed', 'POST', {
                method: 'stream.publish',
                name: name,
                link: link,
                picture: picture,
                description: description,
                message: message,
                caption: caption
            });
        }
    };
})();
window.fbAsyncInit = function () {
    FB.init({
        appId: A.config.appId,
        status: true,
        // check login status
        cookie: true,
        // enable cookies to allow the server to access the session
        oauth: true,
        // enable OAuth 2.0
        xfbml: true // parse XFBML
    });
    // mark as loaded
    A.FB.setLoaded(true);
};