Rollback Tool

// ==UserScript==
// @name         Rollback Tool
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Rollback Tool
// @author       http://dev.wikia.com/wiki/Rollback
// @match        wikia.com
// @grant        none
// @include
// ==/UserScript==
/* jshint -W097 */
'use strict';

// Your code here...
/*
* Rollback
* Perform rollbacks without needing to be in the usergroup
* @author Ozuzanna
*/

;(function($, mw) {

var main = {
    init: function() {
        if ($('.mw-rollback-link a').length) return;

        if (mw.config.get('wgAction') == "history" && $('#pagehistory li').length > 1)
            $('#pagehistory li:first .mw-history-undo a').before('<span class="mw-custom-rollback-link"><a style="cursor: pointer" title="&quot;Rollback&quot; reverts edit(s) to this page of the last contributor in one click" data-id="' + mw.config.get('wgPageName') + '">rollback</a></span> | ');
        else if (mw.config.get('wgCanonicalSpecialPageName') == "Contributions") {
            $('#mw-content-text ul').find('li').each(function() {
                $(this).append(' <span class="mw-custom-rollback-link">[<a style="cursor: pointer" title="&quot;Rollback&quot; reverts edit(s) to this page of the last contributor in one click" data-id="' + $(this).find('a:first').attr('title') + '">rollback</a>]</span>');
            });
        }
        else if ($.getUrlVar('diff') || $.getUrlVar('oldid'))
            $('.mw-usertoollinks:last').after('&nbsp;&nbsp;&nbsp;&nbsp;<span class="mw-custom-rollback-link">[<a style="cursor: pointer" title="&quot;Rollback&quot; reverts edit(s) to this page of the last contributor in one click" data-id="' + mw.config.get('wgPageName') + '">rollback</a>]</span>');

        $('.mw-custom-rollback-link a').click(function() {
            main.getRevisionIdAndContent($(this).attr('data-id'));
        });
    },
    getRevisionIdAndContent: function(title) {
        var API = new mw.Api();
        API.get({
        action: 'query',
        prop: 'revisions',
        titles: title,
        rvprop: 'user|ids',
        rvlimit: 500,
        cb: new Date().getTime()
        })
        .done(function(d) {
            if (!d.error) {
                var revisions;

                for (var i in d.query.pages) {
                    revisions = d.query.pages[i].revisions;
                }

                var currentUser = revisions[0].user, //current user rollbacking from
                lastUser,
                revId;

                for (var i in revisions) {
                    if (revisions[i].user != currentUser) {
                        lastUser = revisions[i].user; //remember last author
                        revId = revisions[i].revid; //get revision to revert to
                        break;
                    }
                }

                if (lastUser) {
                    API.get({
                    action: 'query',
                    prop: 'revisions',
                    rvprop: 'content',
                    revids: revId,
                    cb: new Date().getTime()
                    })
                    .done(function(d) {
                        if (!d.error) {
                            var content = ""; //can be no content on page so initialise empty as failsafe
                            for (var i in d.query.pages) {
                                if (d.query.pages[i].revisions)
                                    content = d.query.pages[i].revisions[0]["*"];
                            }
                            main.performRollback(title,content,currentUser,lastUser);
                        }
                        else
                            new BannerNotification('Unable to rollback (failed to get page content): ' + d.error.code,'error').show();
                    })
                    .fail(function() {
                        new BannerNotification('Unable to rollback: failed to get page content!','error').show();
                    });
                }
                else
                    new BannerNotification('Unable to rollback: no different editor found!','error').show();
            }
            else
                new BannerNotification('Unable to rollback (failed to get revisions): ' + d.error.code,'error').show();
        })
        .fail(function() {
            new BannerNotification('Unable to rollback: failed to get revisions!','error').show();
        });
    },
    performRollback: function(page,text,user,user2) {
        var API = new mw.Api();
        API.post({
        action: 'edit',
        title: page,
        text: text,
        summary: 'Reverted edits by [[Special:Contributions/' + user + '|' + user + ']] ([[User_talk:' + user + '|talk]] | [[Special:Block/' + user + '|block]]) to last version by [[User:' + user2 + '|' + user2 + ']] ([[w:c:dev:Rollback|script]])',
        token: mw.user.tokens.values.editToken
        })
        .done(function(d) {
            if (!d.error) {
                new BannerNotification('Rollback successful!','confirm').show();
            }
            else
                new BannerNotification('Unable to rollback (failed to publish edit): ' + d.error.code,'error').show();
        })
        .fail(function() {
            new BannerNotification('Unable to rollback: failed to publish edit!','error').show();
        });
    }
};

main.init();

}) (this.jQuery, this.mediaWiki);