mirror of
https://github.com/silverstripe/silverstripe-cms
synced 2024-10-22 08:05:56 +02:00
502 lines
16 KiB
PHP
502 lines
16 KiB
PHP
<?php
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/**
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* Virtual Page creates an instance of a page, with the same fields that the original page had, but readonly.
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* This allows you can have a page in mulitple places in the site structure, with different children without duplicating the content
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* Note: This Only duplicates $db fields and not the $has_one etc..
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* @package cms
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*/
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class VirtualPage extends Page {
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static $icon = "cms/images/treeicons/page-shortcut-gold-file.gif";
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static $description = 'Displays the content of another page';
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public static $virtualFields;
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/**
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* @var Array Define fields that are not virtual - the virtual page must define these fields themselves.
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* Note that anything in {@link self::$initially_copied_fields} is implicitly included in this list.
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*/
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public static $non_virtual_fields = array(
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"SecurityTypeID",
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"OwnerID",
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"URLSegment",
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"Sort",
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"Status",
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'ShowInMenus',
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// 'Locale'
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'ShowInSearch',
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'Version',
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"Embargo",
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"Expiry",
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);
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/**
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* @var Array Define fields that are initially copied to virtual pages but left modifiable after that.
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*/
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public static $initially_copied_fields = array(
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'ShowInMenus',
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'ShowInSearch',
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'URLSegment',
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);
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static $has_one = array(
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"CopyContentFrom" => "SiteTree",
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);
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static $db = array(
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"VersionID" => "Int",
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);
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/**
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* Generates the array of fields required for the page type.
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*/
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function getVirtualFields() {
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$nonVirtualFields = array_merge(self::$non_virtual_fields, self::$initially_copied_fields);
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$record = $this->CopyContentFrom();
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$allFields = $record->db();
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if($hasOne = $record->has_one()) foreach($hasOne as $link) $allFields[$link . 'ID'] = "Int";
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$virtualFields = array();
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foreach($allFields as $field => $type) {
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if(!in_array($field, $nonVirtualFields)) $virtualFields[] = $field;
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}
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return $virtualFields;
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}
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/**
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* @return SiteTree Returns the linked page, or failing that, a new object.
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*/
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function CopyContentFrom() {
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if(empty($this->record['CopyContentFromID'])) return new SiteTree();
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if(!isset($this->components['CopyContentFrom'])) {
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$this->components['CopyContentFrom'] = DataObject::get_by_id("SiteTree",
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$this->record['CopyContentFromID']);
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// Don't let VirtualPages point to other VirtualPages
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if($this->components['CopyContentFrom'] instanceof VirtualPage) {
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$this->components['CopyContentFrom'] = null;
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}
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// has_one component semantics incidate than an empty object should be returned
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if(!$this->components['CopyContentFrom']) {
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$this->components['CopyContentFrom'] = new SiteTree();
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}
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}
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return $this->components['CopyContentFrom'] ? $this->components['CopyContentFrom'] : new SiteTree();
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}
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function setCopyContentFromID($val) {
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if(DataObject::get_by_id('SiteTree', $val) instanceof VirtualPage) $val = 0;
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return $this->setField("CopyContentFromID", $val);
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}
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function ContentSource() {
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return $this->CopyContentFrom();
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}
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/**
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* For VirtualPage, add a canonical link tag linking to the original page
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* See TRAC #6828 & http://support.google.com/webmasters/bin/answer.py?hl=en&answer=139394
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*
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* @param boolean $includeTitle Show default <title>-tag, set to false for custom templating
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* @return string The XHTML metatags
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*/
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public function MetaTags($includeTitle = true) {
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$tags = parent::MetaTags($includeTitle);
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if ($this->CopyContentFrom()->ID) {
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$tags .= "<link rel=\"canonical\" href=\"{$this->CopyContentFrom()->Link()}\" />\n";
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}
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return $tags;
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}
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function allowedChildren() {
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if($this->CopyContentFrom()) {
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return $this->CopyContentFrom()->allowedChildren();
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}
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}
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public function syncLinkTracking() {
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if($this->CopyContentFromID) {
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$this->HasBrokenLink = !(bool) DataObject::get_by_id('SiteTree', $this->CopyContentFromID);
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} else {
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$this->HasBrokenLink = true;
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}
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}
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/**
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* We can only publish the page if there is a published source page
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*/
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public function canPublish($member = null) {
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return $this->isPublishable() && parent::canPublish($member);
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}
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/**
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* Return true if we can delete this page from the live site, which is different from can
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* we publish it.
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*/
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public function canDeleteFromLive($member = null) {
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return parent::canPublish($member);
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}
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/**
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* Returns true if is page is publishable by anyone at all
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* Return false if the source page isn't published yet.
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*
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* Note that isPublishable doesn't affect ete from live, only publish.
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*/
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public function isPublishable() {
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// No source
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if(!$this->CopyContentFrom() || !$this->CopyContentFrom()->ID) {
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return false;
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}
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// Unpublished source
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if(!Versioned::get_versionnumber_by_stage('SiteTree', 'Live', $this->CopyContentFromID)) {
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return false;
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}
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// Default - publishable
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return true;
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}
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/**
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* Generate the CMS fields from the fields from the original page.
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*/
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function getCMSFields($cms = null) {
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$fields = parent::getCMSFields($cms);
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// Setup the linking to the original page.
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$copyContentFromField = new TreeDropdownField(
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"CopyContentFromID",
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_t('VirtualPage.CHOOSE', "Choose a page to link to"),
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"SiteTree"
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);
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// filter doesn't let you select children of virtual pages as as source page
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//$copyContentFromField->setFilterFunction(create_function('$item', 'return !($item instanceof VirtualPage);'));
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// Setup virtual fields
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if($virtualFields = $this->getVirtualFields()) {
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$roTransformation = new ReadonlyTransformation();
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foreach($virtualFields as $virtualField) {
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if($fields->dataFieldByName($virtualField))
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$fields->replaceField($virtualField, $fields->dataFieldByName($virtualField)->transform($roTransformation));
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}
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}
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// Add fields to the tab
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$fields->addFieldToTab("Root.Main",
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new HeaderField('VirtualPageHeader',_t('VirtualPage.HEADER', "This is a virtual page")),
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"Title"
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);
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$fields->addFieldToTab("Root.Main", $copyContentFromField, "Title");
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// Create links back to the original object in the CMS
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if($this->CopyContentFrom()->ID) {
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$linkToContent = "<a class=\"cmsEditlink\" href=\"admin/show/$this->CopyContentFromID\">" .
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_t('VirtualPage.EDITCONTENT', 'click here to edit the content') . "</a>";
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$fields->addFieldToTab("Root.Main",
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$linkToContentLabelField = new LabelField('VirtualPageContentLinkLabel', $linkToContent),
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"Title"
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);
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$linkToContentLabelField->setAllowHTML(true);
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}
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return $fields;
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}
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/**
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* We have to change it to copy all the content from the original page first.
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*/
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function onBeforeWrite() {
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$performCopyFrom = null;
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// Determine if we need to copy values.
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if(
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$this->extension_instances['Versioned']->migratingVersion
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&& Versioned::current_stage() == 'Live'
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&& $this->CopyContentFromID
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) {
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// On publication to live, copy from published source.
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$performCopyFrom = true;
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$stageSourceVersion = DB::query("SELECT \"Version\" FROM \"SiteTree\" WHERE \"ID\" = $this->CopyContentFromID")->value();
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$liveSourceVersion = DB::query("SELECT \"Version\" FROM \"SiteTree_Live\" WHERE \"ID\" = $this->CopyContentFromID")->value();
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// We're going to create a new VP record in SiteTree_versions because the published
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// version might not exist, unless we're publishing the latest version
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if($stageSourceVersion != $liveSourceVersion) {
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$this->extension_instances['Versioned']->migratingVersion = null;
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}
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} else {
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// On regular write, copy from draft source. This is only executed when the source page changes.
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$performCopyFrom = $this->isChanged('CopyContentFromID', 2) && $this->CopyContentFromID != 0;
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}
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if($performCopyFrom && $this instanceof VirtualPage) {
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// This flush is needed because the get_one cache doesn't respect site version :-(
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singleton('SiteTree')->flushCache();
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$source = DataObject::get_one("SiteTree",sprintf('"SiteTree"."ID" = %d', $this->CopyContentFromID));
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// Leave the updating of image tracking until after write, in case its a new record
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$this->copyFrom($source, false);
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}
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parent::onBeforeWrite();
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}
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function onAfterWrite() {
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parent::onAfterWrite();
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// Don't do this stuff when we're publishing
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if(!$this->extension_instances['Versioned']->migratingVersion) {
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if(
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$this->isChanged('CopyContentFromID')
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&& $this->CopyContentFromID != 0
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&& $this instanceof VirtualPage
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) {
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$this->updateImageTracking();
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}
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}
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// Check if page type has changed to a non-virtual page.
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// Caution: Relies on the fact that the current instance is still of the old page type.
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if($this->isChanged('ClassName', 2)) {
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$changed = $this->getChangedFields();
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$classBefore = $changed['ClassName']['before'];
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$classAfter = $changed['ClassName']['after'];
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if($classBefore != $classAfter) {
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// Remove all database rows for the old page type to avoid inconsistent data retrieval.
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// TODO This should apply to all page type changes, not only on VirtualPage - but needs
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// more comprehensive testing as its a destructive operation
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$removedTables = array_diff(ClassInfo::dataClassesFor($classBefore), ClassInfo::dataClassesFor($classAfter));
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if($removedTables) foreach($removedTables as $removedTable) {
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// Note: *_versions records are left intact
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foreach(array('', 'Live') as $stage) {
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if($stage) $removedTable = "{$removedTable}_{$stage}";
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DB::query(sprintf('DELETE FROM "%s" WHERE "ID" = %d', $removedTable, $this->ID));
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}
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}
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// Also publish the change immediately to avoid inconsistent behaviour between
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// a non-virtual draft and a virtual live record (e.g. republishing the original record
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// shouldn't republish the - now unrelated - changes on the ex-VirtualPage draft).
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// Copies all stage fields to live as well.
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$source = DataObject::get_one("SiteTree",sprintf('"SiteTree"."ID" = %d', $this->CopyContentFromID));
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$this->copyFrom($source);
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$this->publish('Stage', 'Live');
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// Change reference on instance (as well as removing the underlying database tables)
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$this->CopyContentFromID = 0;
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}
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}
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}
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function validate() {
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$result = parent::validate();
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// "Can be root" validation
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$orig = $this->CopyContentFrom();
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if(!$orig->stat('can_be_root') && !$this->ParentID) {
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$result->error(
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sprintf(
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_t(
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'VirtualPage.PageTypNotAllowedOnRoot',
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'Original page type "%s" is not allowed on the root level for this virtual page',
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PR_MEDIUM,
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'First argument is a class name'
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),
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$orig->i18n_singular_name()
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),
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'CAN_BE_ROOT_VIRTUAL'
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);
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}
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return $result;
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}
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/**
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* Ensure we have an up-to-date version of everything.
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*/
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function copyFrom($source, $updateImageTracking = true) {
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if($source) {
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foreach($this->getVirtualFields() as $virtualField) {
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$this->$virtualField = $source->$virtualField;
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}
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// We also want to copy certain, but only if we're copying the source page for the first
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// time. After this point, the user is free to customise these for the virtual page themselves.
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if($this->isChanged('CopyContentFromID', 2) && $this->CopyContentFromID != 0) {
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foreach(self::$initially_copied_fields as $fieldName) {
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$this->$fieldName = $source->$fieldName;
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}
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}
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if($updateImageTracking) $this->updateImageTracking();
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}
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}
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function updateImageTracking() {
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// Doesn't work on unsaved records
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if(!$this->ID) return;
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// Remove CopyContentFrom() from the cache
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unset($this->components['CopyContentFrom']);
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// Update ImageTracking
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$this->ImageTracking()->setByIdList($this->CopyContentFrom()->ImageTracking()->column('ID'));
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}
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function CMSTreeClasses($controller) {
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return parent::CMSTreeClasses($controller) . ' VirtualPage-' . $this->CopyContentFrom()->ClassName;
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}
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/**
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* Allow attributes on the master page to pass
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* through to the virtual page
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*
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* @param string $field
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* @return mixed
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*/
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function __get($field) {
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if(parent::hasMethod($funcName = "get$field")) {
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return $this->$funcName();
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} else if(parent::hasField($field)) {
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return $this->getField($field);
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} else {
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return $this->copyContentFrom()->$field;
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}
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}
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/**
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* Pass unrecognized method calls on to the original data object
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*
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* @param string $method
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* @param string $args
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*/
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function __call($method, $args) {
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if(parent::hasMethod($method)) {
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return parent::__call($method, $args);
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} else {
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return call_user_func_array(array($this->copyContentFrom(), $method), $args);
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}
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}
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public function hasField($field) {
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return (
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array_key_exists($field, $this->record)
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|| $this->hasDatabaseField($field)
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|| array_key_exists($field, $this->db()) // Needed for composite fields
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|| parent::hasMethod("get{$field}")
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|| $this->CopyContentFrom()->hasField($field)
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);
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}
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/**
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* Overwrite to also check for method on the original data object
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*
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* @param string $method
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* @return bool
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*/
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function hasMethod($method) {
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if(parent::hasMethod($method)) return true;
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return $this->copyContentFrom()->hasMethod($method);
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}
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}
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/**
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* Controller for the virtual page.
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* @package cms
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*/
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class VirtualPage_Controller extends Page_Controller {
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static $allowed_actions = array(
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'loadcontentall' => 'ADMIN',
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);
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/**
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* Reloads the content if the version is different ;-)
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*/
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function reloadContent() {
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$this->failover->copyFrom($this->failover->CopyContentFrom());
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$this->failover->write();
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return;
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}
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function getViewer($action) {
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$originalClass = get_class($this->CopyContentFrom());
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if ($originalClass == 'SiteTree') $name = 'Page_Controller';
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else $name = $originalClass."_Controller";
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$controller = new $name();
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return $controller->getViewer($action);
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}
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/**
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* When the virtualpage is loaded, check to see if the versions are the same
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* if not, reload the content.
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* NOTE: Virtual page must have a container object of subclass of sitetree.
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* We can't load the content without an ID or record to copy it from.
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*/
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function init(){
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if(isset($this->record) && $this->record->ID){
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if($this->record->VersionID != $this->failover->CopyContentFrom()->Version){
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$this->reloadContent();
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$this->VersionID = $this->failover->CopyContentFrom()->VersionID;
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}
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}
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parent::init();
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}
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function loadcontentall() {
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$pages = DataObject::get("VirtualPage");
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foreach($pages as $page) {
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$page->copyFrom($page->CopyContentFrom());
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$page->write();
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$page->publish("Stage", "Live");
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echo "<li>Published $page->URLSegment";
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}
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}
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/**
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* Also check the original object's original controller for the method
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*
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* @param string $method
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* @return bool
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*/
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function hasMethod($method) {
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$haveIt = parent::hasMethod($method);
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if (!$haveIt) {
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$originalClass = get_class($this->CopyContentFrom());
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if ($originalClass == 'SiteTree') $name = 'ContentController';
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else $name = $originalClass."_Controller";
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$controller = new $name($this->dataRecord->copyContentFrom());
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$haveIt = $controller->hasMethod($method);
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}
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return $haveIt;
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}
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/**
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* Pass unrecognized method calls on to the original controller
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*
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* @param string $method
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* @param string $args
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*/
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function __call($method, $args) {
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try {
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return parent::__call($method, $args);
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} catch (Exception $e) {
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// Hack... detect exception type. We really should use exception subclasses.
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// if the exception isn't a 'no method' error, rethrow it
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if ($e->getCode() !== 2175) throw $e;
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$original = $this->copyContentFrom();
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$originalClass = get_class($original);
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if ($originalClass == 'SiteTree') $name = 'ContentController';
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else $name = $originalClass."_Controller";
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$controller = new $name($this->dataRecord->copyContentFrom());
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return call_user_func_array(array($controller, $method), $args);
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}
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}
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}
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