// Reference: http://jasonwatmore.com/post/2014/05/26/angularjs-basic-http-authentication-example

// the authenticationService is used for authenticate the username and password with server, if the username and password is correct, using Base64 to encode the username and password as cookies.

﻿angular
    .module('myApp')
    .factory('authenticationService', authenticationService);

authenticationService.$inject = ['$http', '$cookies', '$rootScope', '$timeout', 'userService'];

function authenticationService($http, $cookies, $rootScope, $timeout, userService) {
    var service = {};

    service.login = login;
    service.setCredentials = setCredentials;
    service.clearCredentials = clearCredentials;

    return service;

    // make a post request to server with username and password to see if it is authenticate
    function login(username, password) {
        var user = {'username':username, 'password':password};
        return $http.post('http://127.0.0.1:8000/socialnet/auth/', user)
            .then(handleSuccess, handleError);
    }

    function handleSuccess(response) {
        return response;
    }

    function handleError(error) {
        return { success: false, response: error };
    }
    // save the encoded username and password in cookie
    function setCredentials(username, password, author) {
        var authdata = Base64.encode(username + ':' + password);
        $rootScope.globals = {
            currentUser: {
                username: username,
                author: author,
                authdata: authdata
            }
        };
        $cookies.putObject('globals', $rootScope.globals, { path: '/'});
    }

    // after log out, remove the cookie
    function clearCredentials() {
        $rootScope.globals = {};
        $cookies.remove('globals');
    }
}

// Base64 encoding service used by authenticationService
var Base64 = {

    keyStr: 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=',

    encode: function (input) {
        var output = "";
        var chr1, chr2, chr3 = "";
        var enc1, enc2, enc3, enc4 = "";
        var i = 0;

        do {
            chr1 = input.charCodeAt(i++);
            chr2 = input.charCodeAt(i++);
            chr3 = input.charCodeAt(i++);

            enc1 = chr1 >> 2;
            enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
            enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
            enc4 = chr3 & 63;

            if (isNaN(chr2)) {
                enc3 = enc4 = 64;
            } else if (isNaN(chr3)) {
                enc4 = 64;
            }

            output = output +
                this.keyStr.charAt(enc1) +
                this.keyStr.charAt(enc2) +
                this.keyStr.charAt(enc3) +
                this.keyStr.charAt(enc4);
            chr1 = chr2 = chr3 = "";
            enc1 = enc2 = enc3 = enc4 = "";
        } while (i < input.length);

        return output;
    },

    decode: function (input) {
        var output = "";
        var chr1, chr2, chr3 = "";
        var enc1, enc2, enc3, enc4 = "";
        var i = 0;

        // remove all characters that are not A-Z, a-z, 0-9, +, /, or =
        var base64test = /[^A-Za-z0-9\+\/\=]/g;
        if (base64test.exec(input)) {
            window.alert("There were invalid base64 characters in the input text.\n" +
                "Valid base64 characters are A-Z, a-z, 0-9, '+', '/',and '='\n" +
                "Expect errors in decoding.");
        }
        input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");

        do {
            enc1 = this.keyStr.indexOf(input.charAt(i++));
            enc2 = this.keyStr.indexOf(input.charAt(i++));
            enc3 = this.keyStr.indexOf(input.charAt(i++));
            enc4 = this.keyStr.indexOf(input.charAt(i++));

            chr1 = (enc1 << 2) | (enc2 >> 4);
            chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
            chr3 = ((enc3 & 3) << 6) | enc4;

            output = output + String.fromCharCode(chr1);

            if (enc3 != 64) {
                output = output + String.fromCharCode(chr2);
            }
            if (enc4 != 64) {
                output = output + String.fromCharCode(chr3);
            }

            chr1 = chr2 = chr3 = "";
            enc1 = enc2 = enc3 = enc4 = "";

        } while (i < input.length);

        return output;
    }
};

@@ -1801,16 +1801,29 @@
 globals'
+,%7B path: '/'%7D
 );%0A    %7D

remove cookies after log out