| 1 |  |  | <?php | 
                            
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                | 3 |  |  | namespace SilverStripe\VersionedAdmin\Controllers; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 4 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 5 |  |  | use SilverStripe\CMS\Controllers\CMSMain; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 6 |  |  | use SilverStripe\CMS\Controllers\CMSPageHistoryController; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 7 |  |  | use SilverStripe\CMS\Model\SiteTree; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 8 |  |  | use SilverStripe\Forms\FieldList; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 9 |  |  | use SilverStripe\Forms\Form; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 10 |  |  | use SilverStripe\Forms\HiddenField; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 11 |  |  | use SilverStripe\ORM\DataObject; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 12 |  |  | use SilverStripe\VersionedAdmin\Forms\HistoryViewerField; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 13 |  |  | use SilverStripe\View\SSViewer; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 14 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 15 |  |  | if (!class_exists(CMSMain::class)) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 16 |  |  |     return; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 17 |  |  | } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 18 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 19 |  |  | /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 20 |  |  |  * The history viewer controller replaces the {@link CMSPageHistoryController} and uses the React based | 
            
                                                                                                            
                            
            
                                    
            
            
                | 21 |  |  |  * {@link HistoryViewerField} to display the history for a {@link DataObject} that has the {@link Versioned} | 
            
                                                                                                            
                            
            
                                    
            
            
                | 22 |  |  |  * extension. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 23 |  |  |  */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 24 |  |  | class CMSPageHistoryViewerController extends CMSPageHistoryController | 
            
                                                                                                            
                            
            
                                    
            
            
                | 25 |  |  | { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 26 |  |  |     private static $url_segment = 'pages/history'; | 
                            
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                | 27 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 28 |  |  |     private static $url_rule = '/$Action/$ID/$VersionID/$OtherVersionID'; | 
                            
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                | 29 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 30 |  |  |     private static $url_priority = 42; | 
                            
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                | 31 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 32 |  |  |     private static $required_permission_codes = 'CMS_ACCESS_CMSMain'; | 
                            
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                | 33 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 34 |  |  |     public function getEditForm($id = null, $fields = null, $versionID = null, $compareID = null) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 35 |  |  |     { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 36 |  |  |         /** @var DataObject $record */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 37 |  |  |         $record = $this->getRecord($id ?: $this->currentPageID()); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 38 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 39 |  |  |         if (!$this->isEnabled($record)) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 40 |  |  |             return parent::getEditForm($id, $fields, $versionID, $compareID); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 41 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 42 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 43 |  |  |         /** @var Form $form */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 44 |  |  |         $form = parent::getEditForm($id); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 45 |  |  |         $form->addExtraClass('history-viewer__form'); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 46 |  |  |         // Disable default CMS preview | 
            
                                                                                                            
                            
            
                                    
            
            
                | 47 |  |  |         $form->removeExtraClass('cms-previewable'); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 48 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 49 |  |  |         if ($record) { | 
                            
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                | 50 |  |  |             $fieldList = FieldList::create( | 
            
                                                                                                            
                            
            
                                    
            
            
                | 51 |  |  |                 HiddenField::create('ID', null, $record->ID), | 
            
                                                                                                            
                            
            
                                    
            
            
                | 52 |  |  |                 HistoryViewerField::create('PageHistory') | 
            
                                                                                                            
                            
            
                                    
            
            
                | 53 |  |  |                     ->setForm($form) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 54 |  |  |             ); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 55 |  |  |             $form->setFields($fieldList); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 56 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 57 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 58 |  |  |         return $form; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 59 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 60 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 61 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 62 |  |  |      * Only activate for pages that have a history viewer capability applied. Extensions can provide their | 
            
                                                                                                            
                            
            
                                    
            
            
                | 63 |  |  |      * own two cents about this criteria. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 64 |  |  |      * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 65 |  |  |      * @param SiteTree $record | 
            
                                                                                                            
                            
            
                                    
            
            
                | 66 |  |  |      * @return bool | 
            
                                                                                                            
                                                                
            
                                    
            
            
                | 67 |  |  |      */ | 
            
                                                                        
                            
            
                                    
            
            
                | 68 |  |  |     public function isEnabled(SiteTree $record = null) | 
            
                                                                        
                            
            
                                    
            
            
                | 69 |  |  |     { | 
            
                                                                        
                            
            
                                    
            
            
                | 70 |  |  |         if (!$record) { | 
            
                                                                        
                            
            
                                    
            
            
                | 71 |  |  |             $record = $this->currentPage(); | 
            
                                                                        
                            
            
                                    
            
            
                | 72 |  |  |         } | 
            
                                                                        
                            
            
                                    
            
            
                | 73 |  |  |  | 
            
                                                                        
                            
            
                                    
            
            
                | 74 |  |  |         $enabledResults = array_filter($this->extend('updateIsEnabled', $record)); | 
            
                                                                        
                            
            
                                    
            
            
                | 75 |  |  |         return ($record && !empty($enabledResults) && max($enabledResults) === true); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 76 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 77 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 78 |  |  |     public function getTabIdentifier() | 
            
                                                                                                            
                            
            
                                    
            
            
                | 79 |  |  |     { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 80 |  |  |         return 'history'; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 81 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 82 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 83 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 84 |  |  |      * Disables the Tools panel when history viewer is enabled | 
            
                                                                                                            
                            
            
                                    
            
            
                | 85 |  |  |      * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 86 |  |  |      * {@inheritDoc} | 
            
                                                                                                            
                            
            
                                    
            
            
                | 87 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 88 |  |  |     public function Tools() | 
            
                                                                                                            
                            
            
                                    
            
            
                | 89 |  |  |     { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 90 |  |  |         if ($this->isEnabled()) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 91 |  |  |             return false; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 92 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 93 |  |  |         return parent::Tools(); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 94 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 95 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 96 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 97 |  |  |      * If the history viewer is not enabled for the current record, do not include its templates in the list. This | 
            
                                                                                                            
                            
            
                                    
            
            
                | 98 |  |  |      * is an automatic template override by controller name, so also needs to be excluded manually. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 99 |  |  |      * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 100 |  |  |      * {@inheritDoc} | 
            
                                                                                                            
                            
            
                                    
            
            
                | 101 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 102 |  |  |     public function getTemplatesWithSuffix($suffix) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 103 |  |  |     { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 104 |  |  |         if ($this->isEnabled()) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 105 |  |  |             return parent::getTemplatesWithSuffix($suffix); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 106 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 107 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 108 |  |  |         $templates = SSViewer::get_templates_by_class(get_parent_class($this), $suffix, __CLASS__); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 109 |  |  |         return SSViewer::chooseTemplate($templates); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 110 |  |  |     } | 
            
                                                                                                            
                                                                
            
                                    
            
            
                | 111 |  |  | } | 
            
                                                        
            
                                    
            
            
                | 112 |  |  |  | 
            
                        
The PSR-1: Basic Coding Standard recommends that a file should either introduce new symbols, that is classes, functions, constants or similar, or have side effects. Side effects are anything that executes logic, like for example printing output, changing ini settings or writing to a file.
The idea behind this recommendation is that merely auto-loading a class should not change the state of an application. It also promotes a cleaner style of programming and makes your code less prone to errors, because the logic is not spread out all over the place.
To learn more about the PSR-1, please see the PHP-FIG site on the PSR-1.