background.js

function onFacebookLogin() {
    "use strict";
    localStorage.accessToken || chrome.tabs.getAllInWindow(null, function (e) {
        for (var i = 0; i < e.length; i += 1) if (e[i].url.indexOf(successURL) === 0) {
            var t = e[i].url.split("#")[1];
            access = t.split("&")[0], console.log(access), localStorage.setItem("accessToken", access), chrome.tabs.onUpdated.removeListener(onFacebookLogin);
            return;
        }
    });
}

function getPermToken() {    
    "use strict";
    $.ajax({
        type: "POST",
        url: "https://graph.facebook.com/oauth/access_token",
        data: {
            grant_type: "fb_exchange_token",
            client_id: "xxxxxxxxxxx",
            client_secret: "yyyyyyyyyyyyyyyyyyyy",
            fb_exchange_token: tempToken
        },
        success: function(e) {
            token = e.split("&")[0], localStorage.setItem("accesskey", token), console.log(token);
        },
        error: function() {
            console.log("Failed to retrieve acceskey");
        }
    });
}

function getUserData() {
    "use strict";
    $.ajax({
        url: "https://graph.facebook.com/me?" + permToken,
        dataType: "json",
        success: function(e) {
            strData = JSON.stringify(e), localStorage.setItem("user", strData), value = localStorage.getItem("user"),            console.log(value);
        },
        error: function() {
            console.log("fail");
        }
    });
}


function getFriendInfo() {
    "use strict";
    $.ajax({
        url: "https://graph.facebook.com/me/friends?" + permToken,
        dataType: "json",
        success: function(e) {
            frndData = JSON.stringify(e), localStorage.setItem(userKey, frndData), frndValue = localStorage.getItem(userKey), console.log(frndValue);
        },
        error: function() {
            console.log("fail");
        }
    }); 
}

chrome.extension.onRequest.addListener(function(e, t, n) {
    "use strict";
    window.u = e.url, window.t = e.title, window.category = e.cat;
});

var successURL = "http://expertapp.gadgetizor.com", i, access, userToken, token, tempToken, permToken, strData, value, userDataStr, userDataJson, userKey, frndData, frndValue;

chrome.tabs.onUpdated.addListener(onFacebookLogin), userToken = localStorage.getItem("accessToken");


if (userToken) {
    tempToken = userToken.split("=")[1];
    getPermToken();
} else {
	console.log("User not logged to facebook yet");
}

permToken = localStorage.getItem("accesskey");

if (permToken) {
    getUserData();
} else {
    console.log("permanent token still not retrieved yet");
}

userDataStr = localStorage.getItem("user");

if (userDataStr) {
    userDataJson = JSON.parse(userDataStr), userKey = userDataJson.id + userDataJson.name;
    getFriendInfo();
} else {
    console.log("still need to download user's data for key");
}