From cda7857e129b05d8d1b11c738d481203b375e6c1 Mon Sep 17 00:00:00 2001
From: Aaron Carlino <unclecheese@leftandmain.com>
Date: Fri, 12 Jul 2019 15:31:17 +1200
Subject: [PATCH] API: Remove deprecated CMSPageHistoryViewer

---
 _config.php                                   |   2 -
 client/dist/js/bundle.js                      |   2 +-
 client/src/bundles/bundle.js                  |   1 -
 client/src/legacy/CMSPageHistoryController.js | 183 -------
 code/Controllers/CMSMain.php                  |  12 +-
 code/Controllers/CMSPageHistoryController.php | 471 ------------------
 .../CMSPageHistoryControllerTest.php          | 205 --------
 .../CMSPageHistoryControllerTest.yml          |  10 -
 .../HistoryController.php                     |  15 -
 9 files changed, 9 insertions(+), 892 deletions(-)
 delete mode 100644 client/src/legacy/CMSPageHistoryController.js
 delete mode 100644 code/Controllers/CMSPageHistoryController.php
 delete mode 100644 tests/php/Controllers/CMSPageHistoryControllerTest.php
 delete mode 100644 tests/php/Controllers/CMSPageHistoryControllerTest.yml
 delete mode 100644 tests/php/Controllers/CMSPageHistoryControllerTest/HistoryController.php

diff --git a/_config.php b/_config.php
index 50511c6e..52b57cdc 100644
--- a/_config.php
+++ b/_config.php
@@ -4,7 +4,6 @@ use SilverStripe\Admin\CMSMenu;
 use SilverStripe\CMS\Controllers\CMSMain;
 use SilverStripe\CMS\Controllers\CMSPageAddController;
 use SilverStripe\CMS\Controllers\CMSPageEditController;
-use SilverStripe\CMS\Controllers\CMSPageHistoryController;
 use SilverStripe\CMS\Controllers\CMSPageSettingsController;
 use SilverStripe\CMS\Model\SiteTree;
 use SilverStripe\Core\Manifest\ModuleLoader;
@@ -37,5 +36,4 @@ ShortcodeParser::get('default')->register(
 CMSMenu::remove_menu_class(CMSMain::class);
 CMSMenu::remove_menu_class(CMSPageEditController::class);
 CMSMenu::remove_menu_class(CMSPageSettingsController::class);
-CMSMenu::remove_menu_class(CMSPageHistoryController::class);
 CMSMenu::remove_menu_class(CMSPageAddController::class);
diff --git a/client/dist/js/bundle.js b/client/dist/js/bundle.js
index dcc65588..bfb8393e 100644
--- a/client/dist/js/bundle.js
+++ b/client/dist/js/bundle.js
@@ -1 +1 @@
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Object.freeze(Object.defineProperties(e,{raw:{value:Object.freeze(t)}}))}(["\nmutation rollbackPage($id:ID!, $toVersion:Int!) {\n  rollbackPage(\n    id: $id\n    toVersion: $toVersion\n  ) {\n    id\n  }\n}\n"],["\nmutation rollbackPage($id:ID!, $toVersion:Int!) {\n  rollbackPage(\n    id: $id\n    toVersion: $toVersion\n  ) {\n    id\n  }\n}\n"]),o=n(4),i=n(10),s=function(e){return e&&e.__esModule?e:{default:e}}(i),l=(0,s.default)(a),d={props:function(e){var t=e.mutate,n=e.ownProps.actions,a=function(e,n){return t({variables:{id:e,toVersion:n}})};return{actions:r({},n,{rollbackPage:a,revertToVersion:a})}},options:{refetchQueries:["ReadHistoryViewerPage"]}};t.mutation=l,t.config=d,t.default=(0,o.graphql)(l,d)},"./node_modules/@babel/runtime/helpers/extends.js":function(e,t){function n(){return e.exports=n=Object.assign||function(e){for(var t=1;t<arguments.length;t++){var n=arguments[t];for(var r in n)Object.prototype.hasOwnProperty.call(n,r)&&(e[r]=n[r])}return e},e.exports.default=e.exports,e.exports.__esModule=!0,n.apply(this,arguments)}e.exports=n,e.exports.default=e.exports,e.exports.__esModule=!0},"./node_modules/@babel/runtime/helpers/inheritsLoose.js":function(e,t,n){function r(e,t){e.prototype=Object.create(t.prototype),e.prototype.constructor=e,a(e,t)}var a=n("./node_modules/@babel/runtime/helpers/setPrototypeOf.js");e.exports=r,e.exports.default=e.exports,e.exports.__esModule=!0},"./node_modules/@babel/runtime/helpers/interopRequireDefault.js":function(e,t){function n(e){return e&&e.__esModule?e:{default:e}}e.exports=n,e.exports.default=e.exports,e.exports.__esModule=!0},"./node_modules/@babel/runtime/helpers/interopRequireWildcard.js":function(e,t,n){function r(e){if("function"!=typeof WeakMap)return null;var t=new WeakMap,n=new WeakMap;return(r=function(e){return e?n:t})(e)}function a(e,t){if(!t&&e&&e.__esModule)return e;if(null===e||"object"!==o(e)&&"function"!=typeof e)return{default:e};var n=r(t);if(n&&n.has(e))return n.get(e);var a={},i=Object.defineProperty&&Object.getOwnPropertyDescriptor;for(var s in e)if("default"!==s&&Object.prototype.hasOwnProperty.call(e,s)){var l=i?Object.getOwnPropertyDescriptor(e,s):null;l&&(l.get||l.set)?Object.defineProperty(a,s,l):a[s]=e[s]}return a.default=e,n&&n.set(e,a),a}var o=n("./node_modules/@babel/runtime/helpers/typeof.js").default;e.exports=a,e.exports.default=e.exports,e.exports.__esModule=!0},"./node_modules/@babel/runtime/helpers/setPrototypeOf.js":function(e,t){function n(t,r){return e.exports=n=Object.setPrototypeOf||function(e,t){return e.__proto__=t,e},e.exports.default=e.exports,e.exports.__esModule=!0,n(t,r)}e.exports=n,e.exports.default=e.exports,e.exports.__esModule=!0},"./node_modules/@babel/runtime/helpers/typeof.js":function(e,t){function n(t){"@babel/helpers - typeof";return"function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?(e.exports=n=function(e){return typeof e},e.exports.default=e.exports,e.exports.__esModule=!0):(e.exports=n=function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e},e.exports.default=e.exports,e.exports.__esModule=!0),n(t)}e.exports=n,e.exports.default=e.exports,e.exports.__esModule=!0},"./node_modules/@silverstripe/reactstrap-confirm/dist/Confirmation.js":function(e,t,n){"use strict";var r=n("./node_modules/@babel/runtime/helpers/interopRequireWildcard.js"),a=n("./node_modules/@babel/runtime/helpers/interopRequireDefault.js");t.__esModule=!0,t.default=void 0;var o=a(n("./node_modules/@babel/runtime/helpers/inheritsLoose.js")),i=r(n(1)),s=a(n(11)),l=n(17),d=function(e){function t(t){var n;return n=e.call(this,t)||this,n.state={isOpen:!0},n}return(0,o.default)(t,e),t.prototype.render=function(){var e=this,t=this.props,n=t.onConfirm,r=t.onCancel,a=t.title,o=t.body,s=t.confirmLabel,d=t.confirmColor,u=t.dismissLabel,c=t.showDismissButton,f=this.state.isOpen,p=function(){"function"==typeof r&&r(),e.setState({isOpen:!1})},h=function(){n(),e.setState({isOpen:!1})};return i.default.createElement(l.Modal,{isOpen:f,toggle:p},a&&i.default.createElement(l.ModalHeader,{toggle:p},a),i.default.createElement(l.ModalBody,null,o),i.default.createElement(l.ModalFooter,null,i.default.createElement(l.Button,{color:d,onClick:h},s),(c||!a)&&i.default.createElement(l.Button,{onClick:p},u||"Cancel")))},t}(i.Component);d.propTypes={onConfirm:s.default.func.isRequired,body:s.default.string.isRequired,onCancel:s.default.func,title:s.default.string,confirmLabel:s.default.string,confirmColor:s.default.string,dismissLabel:s.default.string},d.defaultProps={confirmLabel:"Confirm",confirmColor:"primary"};var u=d;t.default=u},"./node_modules/@silverstripe/reactstrap-confirm/dist/confirm.js":function(e,t,n){"use strict";var r=n("./node_modules/@babel/runtime/helpers/interopRequireDefault.js");t.__esModule=!0,t.default=void 0;var a=r(n("./node_modules/@babel/runtime/helpers/extends.js")),o=r(n(1)),i=r(n(5)),s=r(n("./node_modules/@silverstripe/reactstrap-confirm/dist/Confirmation.js")),l=function(e,t,n,r,l){void 0===t&&(t={}),void 0===n&&(n=document.body),void 0===r&&(r=350);var d=l||s.default,u=n.appendChild(document.createElement("div"));return new Promise(function(s){var l=function(e){return function(){s(e),setTimeout(function(){i.default.unmountComponentAtNode(u),setTimeout(function(){return n.removeChild(u)})},r)}};i.default.render(o.default.createElement(d,(0,a.default)({},t,{onConfirm:l(!0),onCancel:l(!1),body:e})),u)})},d=l;t.default=d},"./node_modules/@silverstripe/reactstrap-confirm/dist/index.js":function(e,t,n){"use strict";var r=n("./node_modules/@babel/runtime/helpers/interopRequireDefault.js");t.__esModule=!0,t.default=void 0;var a=r(n("./node_modules/@silverstripe/reactstrap-confirm/dist/confirm.js")),o=r(n("./node_modules/@silverstripe/reactstrap-confirm/dist/Confirmation.js"));t.Confirmation=o.default;var i=a.default;t.default=i},0:function(e,t){e.exports=jQuery},1:function(e,t){e.exports=React},10:function(e,t){e.exports=GraphQLTag},11:function(e,t){e.exports=PropTypes},12:function(e,t){e.exports=Redux},13:function(e,t){e.exports=DeepFreezeStrict},14:function(e,t){e.exports=FieldHolder},15:function(e,t){e.exports=IsomorphicFetch},16:function(e,t){e.exports=ReactSelect},17:function(e,t){e.exports=Reactstrap},18:function(e,t){e.exports=ReduxForm},19:function(e,t){e.exports=SilverStripeComponent},2:function(e,t){e.exports=i18n},20:function(e,t){e.exports=classnames},21:function(e,t){e.exports=getFormState},3:function(e,t){e.exports=Injector},4:function(e,t){e.exports=ReactApollo},5:function(e,t){e.exports=ReactDom},6:function(e,t){e.exports=ReactRedux}});
\ No newline at end of file
diff --git a/client/src/bundles/bundle.js b/client/src/bundles/bundle.js
index 9a2b35a0..3b943cda 100644
--- a/client/src/bundles/bundle.js
+++ b/client/src/bundles/bundle.js
@@ -2,7 +2,6 @@ require('../legacy/CMSMain.AddForm');
 require('../legacy/CMSMain.EditForm');
 require('../legacy/CMSMain');
 require('../legacy/CMSMain.Tree');
-require('../legacy/CMSPageHistoryController');
 require('../legacy/RedirectorPage');
 require('../legacy/SiteTreeURLSegmentField');
 
diff --git a/client/src/legacy/CMSPageHistoryController.js b/client/src/legacy/CMSPageHistoryController.js
deleted file mode 100644
index 0f9ca35e..00000000
--- a/client/src/legacy/CMSPageHistoryController.js
+++ /dev/null
@@ -1,183 +0,0 @@
-import $ from 'jquery';
-import i18n from 'i18n';
-
-/**
- * File: CMSPageHistoryController.js
- *
- * Handles related interactions between the version selection form on the
- * left hand side of the panel and the version displaying on the right
- * hand side.
- */
-$.entwine('ss', ($) => { // eslint-disable-line no-shadow
-  /**
-   * Class: #Form_VersionsForm
-   *
-   * The left hand side version selection form is the main interface for
-   * users to select a version to view, or to compare two versions
-   */
-  $('#Form_VersionsForm').entwine({
-    /**
-     * Constructor
-     */
-    onmatch() {
-      this._super();
-    },
-    onunmatch() {
-      this._super();
-    },
-    /**
-     * Function: submit.
-     *
-     * Submits either the compare versions form or the view single form
-     * display based on whether we have two or 1 option selected
-     *
-     * Todo:
-     *    Handle coupling to admin url
-     */
-    onsubmit(e) {
-      e.preventDefault();
-      const id = this.find(':input[name=ID]').val();
-
-      if (!id) {
-        return false;
-      }
-
-      let url = null;
-      let to = null;
-      let from = null;
-
-      const compare = (this.find(':input[name=CompareMode]').is(':checked'));
-      const selected = this.find('table input[type=checkbox]').filter(':checked');
-
-      if (compare) {
-        if (selected.length !== 2) {
-          return false;
-        }
-
-        to = selected.eq(0).val();
-        from = selected.eq(1).val();
-        url = i18n.sprintf(this.data('linkTmplCompare'), id, from, to);
-      } else {
-        to = selected.eq(0).val();
-        url = i18n.sprintf(this.data('linkTmplShow'), id, to);
-      }
-
-      $('.cms-container').loadPanel(url, '', { pjax: 'CurrentForm' });
-      return true;
-    },
-  });
-
-  /**
-   * Class: :input[name=ShowUnpublished]
-   *
-   * Used for toggling whether to show or hide unpublished versions.
-   */
-  $('#Form_VersionsForm input[name=ShowUnpublished]').entwine({
-    onmatch() {
-      this.toggle();
-      this._super();
-    },
-    onunmatch() {
-      this._super();
-    },
-    /**
-     * Event: :input[name=ShowUnpublished] change
-     *
-     * Changing the show unpublished checkbox toggles whether to show
-     * or hide the unpublished versions. Because those rows may be being
-     * compared this also ensures those rows are unselected.
-     */
-    onchange() {
-      this.toggle();
-    },
-    toggle() {
-      const self = $(this);
-      const unpublished = self.parents('form').find('tr[data-published=false]');
-
-      if (self.attr('checked')) {
-        unpublished
-          .removeClass('ui-helper-hidden')
-          .show();
-      } else {
-        unpublished
-          .addClass('ui-helper-hidden')
-          .hide()
-          ._unselect();
-      }
-    },
-  });
-
-  /**
-   * Class: #Form_VersionsForm tr
-   *
-   * An individual row in the versions form. Selecting the row updates
-   * the edit form depending on whether we're showing individual version
-   * information or displaying comparsion.
-   */
-  $('#Form_VersionsForm tbody tr').entwine({
-
-    /**
-     * Function: onclick
-     *
-     * Selects or deselects the row (if in compare mode). Will trigger
-     * an update of the edit form if either selected (in single mode)
-     * or if this is the second row selected (in compare mode)
-     */
-    onclick() {
-      // compare mode
-      const compare = this.parents('form').find(':input[name=CompareMode]').attr('checked');
-      const selected = this.siblings('.active');
-
-      if (compare && this.hasClass('active')) {
-        this._unselect();
-        return;
-      }
-
-      if (compare) {
-        // check if we have already selected more than two.
-        if (selected.length > 1) {
-          // eslint-disable-next-line no-alert
-          alert(i18n._t('CMS.ONLYSELECTTWO', 'You can only compare two versions at this time.'));
-          return;
-        }
-
-        this._select();
-
-        // if this is the second selected then we can compare.
-        if (selected.length === 1) {
-          this.parents('form').submit();
-        }
-        return;
-      }
-      this._select();
-      selected._unselect();
-      this.parents('form').submit();
-    },
-
-    /**
-     * Function: _unselect()
-     *
-     * Unselects the row from the form selection.
-     *
-     * Using regular js to update the class rather than this.removeClass('active')
-     * because the latter causes the browser to continuously call
-     * element.compareDocumentPosition, causing the browser to hang for long
-     * periods of time, especially on pages with lots of versions (e.g. 100+)
-     */
-    _unselect() {
-      this.get(0).classList.remove('active');
-      this.find(':input[type=checkbox][checked]').attr('checked', false);
-    },
-
-    /**
-     * Function: _select()
-     *
-     * Selects the currently matched row in the form selection
-     */
-    _select() {
-      this.addClass('active');
-      this.find(':input[type=checkbox]').attr('checked', true);
-    },
-
-  });
-});
diff --git a/code/Controllers/CMSMain.php b/code/Controllers/CMSMain.php
index df619ea8..2ff2a3ed 100644
--- a/code/Controllers/CMSMain.php
+++ b/code/Controllers/CMSMain.php
@@ -68,6 +68,7 @@ use SilverStripe\SiteConfig\SiteConfig;
 use SilverStripe\Versioned\ChangeSet;
 use SilverStripe\Versioned\ChangeSetItem;
 use SilverStripe\Versioned\Versioned;
+use SilverStripe\VersionedAdmin\Controllers\CMSPageHistoryViewerController;
 use SilverStripe\View\ArrayData;
 use SilverStripe\View\Requirements;
 use Translatable;
@@ -398,10 +399,13 @@ class CMSMain extends LeftAndMain implements CurrentPageIdentifier, PermissionPr
 
     public function LinkPageHistory()
     {
-        if ($id = $this->currentPageID()) {
-            return $this->LinkWithSearch(
-                Controller::join_links(CMSPageHistoryController::singleton()->Link('show'), $id)
-            );
+        $controller = Injector::inst()->get(CMSPageHistoryViewerController::class);
+        if (($id = $this->currentPageID()) && $controller) {
+            if ($controller) {
+                return $this->LinkWithSearch(
+                    Controller::join_links($controller->Link('show'), $id)
+                );
+            }
         } else {
             return null;
         }
diff --git a/code/Controllers/CMSPageHistoryController.php b/code/Controllers/CMSPageHistoryController.php
deleted file mode 100644
index eba00f31..00000000
--- a/code/Controllers/CMSPageHistoryController.php
+++ /dev/null
@@ -1,471 +0,0 @@
-<?php
-
-namespace SilverStripe\CMS\Controllers;
-
-use SilverStripe\Admin\LeftAndMainFormRequestHandler;
-use SilverStripe\CMS\Model\SiteTree;
-use SilverStripe\Control\Controller;
-use SilverStripe\Control\HTTPRequest;
-use SilverStripe\Control\HTTPResponse;
-use SilverStripe\Forms\CheckboxField;
-use SilverStripe\Forms\FieldList;
-use SilverStripe\Forms\Form;
-use SilverStripe\Forms\FormAction;
-use SilverStripe\Forms\HiddenField;
-use SilverStripe\Forms\HTMLReadonlyField;
-use SilverStripe\Forms\LiteralField;
-use SilverStripe\Forms\Tab;
-use SilverStripe\ORM\FieldType\DBField;
-use SilverStripe\Versioned\Versioned;
-use SilverStripe\Security\Security;
-use SilverStripe\View\ArrayData;
-use SilverStripe\View\ViewableData;
-
-/**
- * Legacy CMS History controller. This functionality has been moved to the `silverstripe/versioned-admin` module and
- * this class will be removed completly in SilverStripe 5.0.0.
- * @deprecated 4.3.0:5.0.0
- */
-class CMSPageHistoryController extends CMSMain
-{
-
-    private static $url_segment = 'pages/history';
-
-    private static $url_rule = '/$Action/$ID/$VersionID/$OtherVersionID';
-
-    private static $url_priority = 42;
-
-    private static $menu_title = 'History';
-
-    private static $required_permission_codes = 'CMS_ACCESS_CMSMain';
-
-    private static $allowed_actions = [
-        'EditForm',
-        'VersionsForm',
-        'CompareVersionsForm',
-        'show',
-        'compare'
-    ];
-
-    private static $url_handlers = [
-        '$Action/$ID/$VersionID/$OtherVersionID' => 'handleAction',
-        'EditForm/$ID/$VersionID' => 'EditForm',
-    ];
-
-    /**
-     * Current version ID for this request. Can be 0 for latest version
-     *
-     * @var int
-     */
-    protected $versionID = null;
-
-    public function getResponseNegotiator()
-    {
-        $negotiator = parent::getResponseNegotiator();
-
-        $negotiator->setCallback('CurrentForm', function () {
-            $form = $this->getEditForm();
-            if ($form) {
-                return $form->forTemplate();
-            }
-            return $this->renderWith($this->getTemplatesWithSuffix('_Content'));
-        });
-
-        $negotiator->setCallback('default', function () {
-            return $this->renderWith($this->getViewer('show'));
-        });
-
-        return $negotiator;
-    }
-
-    /**
-     * @param HTTPRequest $request
-     * @return HTTPResponse
-     */
-    public function show($request)
-    {
-        // Record id and version for this request
-        $id = $request->param('ID');
-        $this->setCurrentPageID($id);
-        $versionID = $request->param('VersionID');
-        $this->setVersionID($versionID);
-
-        // Show id
-        $form = $this->getEditForm();
-
-        $negotiator = $this->getResponseNegotiator();
-        $negotiator->setCallback('CurrentForm', function () use ($form) {
-            return $form
-                ? $form->forTemplate()
-                : $this->renderWith($this->getTemplatesWithSuffix('_Content'));
-        });
-        $negotiator->setCallback('default', function () use ($form) {
-            return $this
-                ->customise(['EditForm' => $form])
-                ->renderWith($this->getViewer('show'));
-        });
-
-        return $negotiator->respond($request);
-    }
-
-    /**
-     * @param HTTPRequest $request
-     * @return HTTPResponse
-     */
-    public function compare($request)
-    {
-        $form = $this->CompareVersionsForm(
-            $request->param('VersionID'),
-            $request->param('OtherVersionID')
-        );
-
-        $negotiator = $this->getResponseNegotiator();
-        $negotiator->setCallback('CurrentForm', function () use ($form) {
-            return $form ? $form->forTemplate() : $this->renderWith($this->getTemplatesWithSuffix('_Content'));
-        });
-        $negotiator->setCallback('default', function () use ($form) {
-            return $this->customise(['EditForm' => $form])->renderWith($this->getViewer('show'));
-        });
-
-        return $negotiator->respond($request);
-    }
-
-    public function getSilverStripeNavigator()
-    {
-        $record = $this->getRecord($this->currentPageID(), $this->getRequest()->param('VersionID'));
-        if ($record) {
-            $navigator = new SilverStripeNavigator($record);
-            return $navigator->renderWith($this->getTemplatesWithSuffix('_SilverStripeNavigator'));
-        } else {
-            return false;
-        }
-    }
-
-    /**
-     * @param HTTPRequest $request
-     * @return Form
-     */
-    public function EditForm($request = null)
-    {
-        if ($request) {
-            // Validate VersionID is present
-            $versionID = $request->param('VersionID');
-            if (!isset($versionID)) {
-                $this->httpError(400);
-                return null;
-            }
-            $this->setVersionID($versionID);
-        }
-        return parent::EditForm($request);
-    }
-
-    /**
-     * Returns the read only version of the edit form. Detaches all {@link FormAction}
-     * instances attached since only action relates to revert.
-     *
-     * Permission checking is done at the {@link CMSMain::getEditForm()} level.
-     *
-     * @param int $id ID of the record to show
-     * @param array $fields optional
-     * @param int $versionID
-     * @param int $compareID Compare mode
-     *
-     * @return Form
-     */
-    public function getEditForm($id = null, $fields = null, $versionID = null, $compareID = null)
-    {
-        if (!$id) {
-            $id = $this->currentPageID();
-        }
-        if (!$versionID) {
-            $versionID = $this->getVersionID();
-        }
-
-        $record = $this->getRecord($id, $versionID);
-        if (!$record) {
-            return $this->EmptyForm();
-        }
-
-        // Refresh version ID
-        $versionID = $record->Version;
-        $this->setVersionID($versionID);
-
-        // Get edit form
-        $form = parent::getEditForm($record, $record->getCMSFields());
-        // Respect permission failures from parent implementation
-        if (!($form instanceof Form)) {
-            return $form;
-        }
-
-        // TODO: move to the SilverStripeNavigator structure so the new preview can pick it up.
-        //$nav = new SilverStripeNavigatorItem_ArchiveLink($record);
-
-        $actions = new FieldList(
-            $revert = FormAction::create(
-                'doRollback',
-                _t('SilverStripe\\CMS\\Controllers\\CMSPageHistoryController.REVERTTOTHISVERSION', 'Revert to this version')
-            )
-                ->setUseButtonTag(true)
-                ->addExtraClass('btn-warning font-icon-back-in-time')
-        );
-        $actions->setForm($form);
-        $form->setActions($actions);
-
-        $fields = $form->Fields();
-        $fields->removeByName("Status");
-        $fields->push(new HiddenField("ID"));
-        $fields->push(new HiddenField("Version"));
-
-        $fields = $fields->makeReadonly();
-
-        if ($compareID) {
-            $link = Controller::join_links(
-                $this->Link('show'),
-                $id
-            );
-
-            $view = _t(__CLASS__ . '.VIEW', "view");
-
-            $message = _t(
-                __CLASS__ . '.COMPARINGVERSION',
-                "Comparing versions {version1} and {version2}.",
-                [
-                    'version1' => sprintf('%s (<a href="%s">%s</a>)', $versionID, Controller::join_links($link, $versionID), $view),
-                    'version2' => sprintf('%s (<a href="%s">%s</a>)', $compareID, Controller::join_links($link, $compareID), $view)
-                ]
-            );
-
-            $revert->setReadonly(true);
-        } else {
-            if ($record->isLatestVersion()) {
-                $message = _t(__CLASS__ . '.VIEWINGLATEST', 'Currently viewing the latest version.');
-            } else {
-                $message = _t(
-                    __CLASS__ . '.VIEWINGVERSION',
-                    "Currently viewing version {version}.",
-                    ['version' => $versionID]
-                );
-            }
-        }
-
-        /** @var Tab $mainTab */
-        $mainTab = $fields->fieldByName('Root.Main');
-        $mainTab->unshift(
-            LiteralField::create('CurrentlyViewingMessage', ArrayData::create([
-                'Content' => DBField::create_field('HTMLFragment', $message),
-                'Classes' => 'alert alert-info'
-            ])->renderWith($this->getTemplatesWithSuffix('_notice')))
-        );
-
-        $form->setFields($fields->makeReadonly());
-        $form->loadDataFrom([
-            "ID" => $id,
-            "Version" => $versionID,
-        ]);
-
-        if ($record->isLatestVersion()) {
-            $revert->setReadonly(true);
-        }
-
-        $form->removeExtraClass('cms-content');
-
-        // History form has both ID and VersionID as suffixes
-        $form->setRequestHandler(
-            LeftAndMainFormRequestHandler::create($form, [$id, $versionID])
-        );
-
-        return $form;
-    }
-
-
-    /**
-     * Version select form. Main interface between selecting versions to view
-     * and comparing multiple versions.
-     *
-     * Because we can reload the page directly to a compare view (history/compare/1/2/3)
-     * this form has to adapt to those parameters as well.
-     *
-     * @return Form
-     */
-    public function VersionsForm()
-    {
-        $id = $this->currentPageID();
-        $page = $this->getRecord($id);
-        $versionsHtml = '';
-
-        $action = $this->getRequest()->param('Action');
-        $versionID = $this->getRequest()->param('VersionID');
-        $otherVersionID = $this->getRequest()->param('OtherVersionID');
-
-        $showUnpublishedChecked = 0;
-        $compareModeChecked = ($action == "compare");
-
-        if ($page) {
-            $versions = $page->allVersions();
-            $versionID = (!$versionID) ? $page->Version : $versionID;
-
-            if ($versions) {
-                foreach ($versions as $k => $version) {
-                    $active = false;
-
-                    if ($version->Version == $versionID || $version->Version == $otherVersionID) {
-                        $active = true;
-
-                        if (!$version->WasPublished) {
-                            $showUnpublishedChecked = 1;
-                        }
-                    }
-
-                    $version->Active = ($active);
-                }
-            }
-
-            $vd = new ViewableData();
-
-            $versionsHtml = $vd->customise([
-                'Versions' => $versions
-            ])->renderWith($this->getTemplatesWithSuffix('_versions'));
-        }
-
-        $fields = new FieldList(
-            new CheckboxField(
-                'ShowUnpublished',
-                _t('SilverStripe\\CMS\\Controllers\\CMSPageHistoryController.SHOWUNPUBLISHED', 'Show unpublished versions'),
-                $showUnpublishedChecked
-            ),
-            new CheckboxField(
-                'CompareMode',
-                _t('SilverStripe\\CMS\\Controllers\\CMSPageHistoryController.COMPAREMODE', 'Compare mode (select two)'),
-                $compareModeChecked
-            ),
-            new LiteralField('VersionsHtml', $versionsHtml),
-            $hiddenID = new HiddenField('ID', false, "")
-        );
-
-        $form = Form::create(
-            $this,
-            'VersionsForm',
-            $fields,
-            new FieldList()
-        )->setHTMLID('Form_VersionsForm');
-        $form->loadDataFrom($this->getRequest()->requestVars());
-        $hiddenID->setValue($id);
-        $form->unsetValidator();
-
-        $form
-            ->addExtraClass('cms-versions-form') // placeholder, necessary for $.metadata() to work
-            ->setAttribute('data-link-tmpl-compare', Controller::join_links($this->Link('compare'), '%s', '%s', '%s'))
-            ->setAttribute('data-link-tmpl-show', Controller::join_links($this->Link('show'), '%s', '%s'));
-
-        return $form;
-    }
-
-    /**
-     * @param int $versionID
-     * @param int $otherVersionID
-     * @return mixed
-     */
-    public function CompareVersionsForm($versionID, $otherVersionID)
-    {
-        if ($versionID > $otherVersionID) {
-            $toVersion = $versionID;
-            $fromVersion = $otherVersionID;
-        } else {
-            $toVersion = $otherVersionID;
-            $fromVersion = $versionID;
-        }
-
-        if (!$toVersion || !$fromVersion) {
-            return null;
-        }
-
-        $id = $this->currentPageID();
-        /** @var SiteTree $page */
-        $page = SiteTree::get()->byID($id);
-
-        $record = null;
-        if ($page && $page->exists()) {
-            if (!$page->canView()) {
-                return Security::permissionFailure($this);
-            }
-
-            $record = $page->compareVersions($fromVersion, $toVersion);
-        }
-
-        $fromVersionRecord = Versioned::get_version(SiteTree::class, $id, $fromVersion);
-        $toVersionRecord = Versioned::get_version(SiteTree::class, $id, $toVersion);
-
-        if (!$fromVersionRecord) {
-            throw new \Exception("Can't find version $fromVersion of page $id");
-        }
-
-        if (!$toVersionRecord) {
-            throw new \Exception("Can't find version $toVersion of page $id");
-        }
-
-        if (!$record) {
-            return null;
-        }
-        $form = $this->getEditForm($id, null, $fromVersion, $toVersion);
-        $form->setActions(new FieldList());
-        $form->addExtraClass('compare');
-
-        $form->loadDataFrom($record);
-        $form->loadDataFrom([
-            "ID" => $id,
-            "Version" => $fromVersion,
-        ]);
-
-        // Comparison views shouldn't be editable.
-        // As the comparison output is HTML and not valid values for the various field types
-        $readonlyFields = $this->transformReadonly($form->Fields());
-        $form->setFields($readonlyFields);
-
-        return $form;
-    }
-
-    /**
-     * Replace all data fields with HTML readonly fields to display diff
-     *
-     * @param FieldList $fields
-     * @return FieldList
-     */
-    public function transformReadonly(FieldList $fields)
-    {
-        foreach ($fields->dataFields() as $field) {
-            if ($field instanceof HiddenField) {
-                continue;
-            }
-            $newField = $field->castedCopy(HTMLReadonlyField::class);
-            $fields->replaceField($field->getName(), $newField);
-        }
-        return $fields;
-    }
-
-    /**
-     * Set current version ID
-     *
-     * @param int $versionID
-     * @return $this
-     */
-    public function setVersionID($versionID)
-    {
-        $this->versionID = $versionID;
-        return $this;
-    }
-
-    /**
-     * Get current version ID
-     *
-     * @return int
-     */
-    public function getVersionID()
-    {
-        return $this->versionID;
-    }
-
-    public function getTabIdentifier()
-    {
-        return 'history';
-    }
-}
diff --git a/tests/php/Controllers/CMSPageHistoryControllerTest.php b/tests/php/Controllers/CMSPageHistoryControllerTest.php
deleted file mode 100644
index 13e48873..00000000
--- a/tests/php/Controllers/CMSPageHistoryControllerTest.php
+++ /dev/null
@@ -1,205 +0,0 @@
-<?php
-
-namespace SilverStripe\CMS\Tests\Controllers;
-
-use SilverStripe\CMS\Controllers\CMSPageHistoryController;
-use SilverStripe\CMS\Model\SiteTree;
-use SilverStripe\Control\Controller;
-use SilverStripe\Core\Injector\Injector;
-use SilverStripe\Dev\FunctionalTest;
-use SilverStripe\Forms\FieldGroup;
-use SilverStripe\Forms\FieldList;
-use SilverStripe\Forms\HTMLReadonlyField;
-use SilverStripe\Forms\HiddenField;
-use SilverStripe\Forms\TextField;
-
-class CMSPageHistoryControllerTest extends FunctionalTest
-{
-    protected static $fixture_file = 'CMSPageHistoryControllerTest.yml';
-
-    protected $versionUnpublishedCheck;
-    protected $versionPublishCheck;
-    protected $versionUnpublishedCheck2;
-    protected $versionPublishCheck2;
-    protected $page;
-
-    protected static $extra_controllers = [
-        CMSPageHistoryControllerTest\HistoryController::class,
-    ];
-
-    protected function setUp(): void
-    {
-        parent::setUp();
-
-        Injector::inst()->registerService(
-            new CMSPageHistoryController(),
-            CMSPageHistoryController::class
-        );
-
-        $this->loginWithPermission('ADMIN');
-
-        // creates a series of published, unpublished versions of a page
-        $this->page = new SiteTree();
-        $this->page->URLSegment = "test";
-        $this->page->Content = "new content";
-        $this->page->write();
-        $this->versionUnpublishedCheck = $this->page->Version; // v1
-
-        $this->page->Content = "some further content";
-        $this->page->publishSingle();
-        $this->versionPublishCheck = $this->page->Version; // v2
-
-        $this->page->Content = "No, more changes please";
-        $this->page->Title = "Changing titles too";
-        $this->page->write();
-        $this->versionUnpublishedCheck2 = $this->page->Version; // v3
-
-        $this->page->Title = "Final Change";
-        $this->page->publishSingle();
-        $this->versionPublishCheck2 = $this->page->Version; // v4
-    }
-
-    public function testGetEditForm()
-    {
-        $controller = new CMSPageHistoryController();
-        $controller->setRequest(Controller::curr()->getRequest());
-
-        // should get the latest version which we cannot rollback to
-        $form = $controller->getEditForm($this->page->ID);
-
-        $this->assertTrue($form->Actions()->dataFieldByName('action_doRollback')->isReadonly());
-
-        $this->assertEquals($this->page->ID, $form->Fields()->dataFieldByName('ID')->Value());
-        $this->assertEquals($this->versionPublishCheck2, $form->Fields()->dataFieldByName('Version')->Value());
-
-        $this->assertStringContainsString(
-            'Currently viewing the latest version',
-            $form->Fields()->fieldByName('Root.Main.CurrentlyViewingMessage')->getContent()
-        );
-
-        // edit form with a given version
-        $form = $controller->getEditForm($this->page->ID, null, $this->versionPublishCheck);
-        $this->assertFalse($form->Actions()->dataFieldByName('action_doRollback')->isReadonly());
-
-        $this->assertEquals($this->page->ID, $form->Fields()->dataFieldByName('ID')->Value());
-        $this->assertEquals($this->versionPublishCheck, $form->Fields()->dataFieldByName('Version')->Value());
-        $this->assertStringContainsString(
-            sprintf("Currently viewing version %s.", $this->versionPublishCheck),
-            $form->Fields()->fieldByName('Root.Main.CurrentlyViewingMessage')->getContent()
-        );
-
-        // check that compare mode updates the message
-        $form = $controller->getEditForm(
-            $this->page->ID,
-            null,
-            $this->versionPublishCheck,
-            $this->versionPublishCheck2
-        );
-        $this->assertStringContainsString(
-            sprintf("Comparing versions %s", $this->versionPublishCheck),
-            $form->Fields()->fieldByName('Root.Main.CurrentlyViewingMessage')->getContent()
-        );
-
-        $this->assertStringContainsString(
-            sprintf("and %s", $this->versionPublishCheck2),
-            $form->Fields()->fieldByName('Root.Main.CurrentlyViewingMessage')->getContent()
-        );
-    }
-
-    /**
-     * @todo should be less tied to cms theme.
-     * @todo check highlighting for comparing pages.
-     */
-    public function testVersionsForm()
-    {
-        $this->get('admin/pages/legacyhistory/show/' . $this->page->ID);
-
-        $form = $this->cssParser()->getBySelector('#Form_VersionsForm');
-
-        $this->assertEquals(1, count($form ?? []));
-
-        // check the page ID is present
-        $hidden = $form[0]->xpath("fieldset/input[@type='hidden']");
-
-        $this->assertThat($hidden, $this->logicalNot($this->isNull()), 'Hidden ID field exists');
-        $this->assertEquals($this->page->ID, (int) $hidden[0]->attributes()->value);
-
-        // ensure that all the versions are present in the table and displayed
-        $rows = $form[0]->xpath("fieldset/table/tbody/tr");
-        $this->assertEquals(4, count($rows ?? []));
-    }
-
-    public function testVersionsFormTableContainsInformation()
-    {
-        $this->get('admin/pages/legacyhistory/show/' . $this->page->ID);
-        $form = $this->cssParser()->getBySelector('#Form_VersionsForm');
-        $rows = $form[0]->xpath("fieldset/table/tbody/tr");
-
-        $expected = [
-            ['version' => $this->versionPublishCheck2, 'status' => 'published'],
-            ['version' => $this->versionUnpublishedCheck2, 'status' => 'internal'],
-            ['version' => $this->versionPublishCheck, 'status' => 'published'],
-            ['version' => $this->versionUnpublishedCheck, 'status' => 'internal'],
-        ];
-
-        // goes the reverse order that we created in setUp()
-        $i = 0;
-        foreach ($rows as $tr) {
-            // data-link must be present for the javascript to load new
-            $this->assertStringContainsString($expected[$i]['status'], (string) $tr->attributes()->class);
-            $i++;
-        }
-
-        // test highlighting
-        $this->assertStringContainsString('active', (string) $rows[0]->attributes()->class);
-        $this->assertThat((string) $rows[1]->attributes()->class, $this->logicalNot($this->stringContains('active')));
-    }
-
-    public function testVersionsFormSelectsUnpublishedCheckbox()
-    {
-        $this->get('admin/pages/legacyhistory/show/' . $this->page->ID);
-        $checkbox = $this->cssParser()->getBySelector('#Form_VersionsForm_ShowUnpublished');
-
-        $this->assertThat($checkbox[0], $this->logicalNot($this->isNull()));
-        $checked = $checkbox[0]->attributes()->checked ?: '';
-
-        $this->assertThat($checked, $this->logicalNot($this->stringContains('checked')));
-
-        // viewing an unpublished
-        $this->get('admin/pages/legacyhistory/show/' . $this->page->ID . '/' . $this->versionUnpublishedCheck);
-        $checkbox = $this->cssParser()->getBySelector('#Form_VersionsForm_ShowUnpublished');
-
-        $this->assertThat($checkbox[0], $this->logicalNot($this->isNull()));
-        $this->assertEquals('checked', (string) $checkbox[0]->attributes()->checked);
-    }
-
-    public function testTransformReadonly()
-    {
-        /** @var CMSPageHistoryController $history */
-        $history = new CMSPageHistoryController();
-        $history->setRequest(Controller::curr()->getRequest());
-
-        $fieldList = FieldList::create([
-            FieldGroup::create('group', [
-                TextField::create('childField', 'child field'),
-            ]),
-            TextField::create('field', 'field', 'My <del>value</del><ins>change</ins>'),
-            HiddenField::create('hiddenField', 'hidden field'),
-        ]);
-
-        $newList = $history->transformReadonly($fieldList);
-
-        $field = $newList->dataFieldByName('field');
-        $this->assertTrue($field instanceof HTMLReadonlyField);
-        $this->assertStringContainsString('<ins>', $field->forTemplate());
-
-        $groupField = $newList->fieldByName('group');
-        $this->assertTrue($groupField instanceof FieldGroup);
-
-        $childField = $newList->dataFieldByName('childField');
-        $this->assertTrue($childField instanceof HTMLReadonlyField);
-
-        $hiddenField = $newList->dataFieldByName('hiddenField');
-        $this->assertTrue($hiddenField instanceof HiddenField);
-    }
-}
diff --git a/tests/php/Controllers/CMSPageHistoryControllerTest.yml b/tests/php/Controllers/CMSPageHistoryControllerTest.yml
deleted file mode 100644
index dad212df..00000000
--- a/tests/php/Controllers/CMSPageHistoryControllerTest.yml
+++ /dev/null
@@ -1,10 +0,0 @@
-SilverStripe\CMS\Model\SiteTree:
-  page1:
-    Title: Page 1
-    Sort: 1
-  page2:
-    Title: Page 2
-    Sort: 2
-  page3:
-    Title: Page 3
-    Sort: 3
diff --git a/tests/php/Controllers/CMSPageHistoryControllerTest/HistoryController.php b/tests/php/Controllers/CMSPageHistoryControllerTest/HistoryController.php
deleted file mode 100644
index f214f8fb..00000000
--- a/tests/php/Controllers/CMSPageHistoryControllerTest/HistoryController.php
+++ /dev/null
@@ -1,15 +0,0 @@
-<?php
-
-namespace SilverStripe\CMS\Tests\Controllers\CMSPageHistoryControllerTest;
-
-use SilverStripe\CMS\Controllers\CMSPageHistoryController;
-use SilverStripe\Dev\TestOnly;
-
-/**
- * Used to circumvent potential URL conflicts with the silverstripe/versioned-admin history viewer controller
- * when running unit tests on the legacy CMSPageHistoryController.
- */
-class HistoryController extends CMSPageHistoryController implements TestOnly
-{
-    private static $url_segment = 'pages/legacyhistory';
-}