silverstripe-cms/code/Model/VirtualPage.php

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<?php
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namespace SilverStripe\CMS\Model;
use SilverStripe\Core\Convert;
use SilverStripe\Forms\LiteralField;
use SilverStripe\Forms\ReadonlyTransformation;
use SilverStripe\Forms\TreeDropdownField;
use SilverStripe\ORM\DataObject;
use SilverStripe\ORM\Versioning\Versioned;
use SilverStripe\Security\Member;
use Page;
/**
* Virtual Page creates an instance of a page, with the same fields that the original page had, but readonly.
* This allows you can have a page in mulitple places in the site structure, with different children without duplicating the content
* Note: This Only duplicates $db fields and not the $has_one etc..
*
* @method SiteTree CopyContentFrom()
* @property int $CopyContentFromID
*/
class VirtualPage extends Page {
private static $description = 'Displays the content of another page';
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public static $virtualFields;
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/**
* @var array Define fields that are not virtual - the virtual page must define these fields themselves.
* Note that anything in {@link self::config()->initially_copied_fields} is implicitly included in this list.
*/
private static $non_virtual_fields = array(
"ID",
"ClassName",
"ObsoleteClassName",
"SecurityTypeID",
"OwnerID",
"ParentID",
"URLSegment",
"Sort",
"Status",
'ShowInMenus',
// 'Locale'
'ShowInSearch',
'Version',
"Embargo",
"Expiry",
"CanViewType",
"CanEditType",
"CopyContentFromID",
"HasBrokenLink",
);
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/**
* @var array Define fields that are initially copied to virtual pages but left modifiable after that.
*/
private static $initially_copied_fields = array(
'ShowInMenus',
'ShowInSearch',
'URLSegment',
);
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private static $has_one = array(
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"CopyContentFrom" => "SilverStripe\\CMS\\Model\\SiteTree",
);
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private static $owns = array(
"CopyContentFrom",
);
private static $db = array(
"VersionID" => "Int",
);
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private static $table_name = 'VirtualPage';
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/**
* Generates the array of fields required for the page type.
*
* @return array
*/
public function getVirtualFields() {
// Check if copied page exists
$record = $this->CopyContentFrom();
if(!$record || !$record->exists()) {
return array();
}
// Diff db with non-virtual fields
$fields = array_keys($record->db());
$nonVirtualFields = $this->getNonVirtualisedFields();
return array_diff($fields, $nonVirtualFields);
}
/**
* List of fields or properties to never virtualise
*
* @return array
*/
public function getNonVirtualisedFields() {
return array_merge($this->config()->non_virtual_fields, $this->config()->initially_copied_fields);
}
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public function setCopyContentFromID($val) {
// Sanity check to prevent pages virtualising other virtual pages
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if($val && DataObject::get_by_id('SilverStripe\\CMS\\Model\\SiteTree', $val) instanceof VirtualPage) {
$val = 0;
}
return $this->setField("CopyContentFromID", $val);
}
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public function ContentSource() {
$copied = $this->CopyContentFrom();
if($copied && $copied->exists()) {
return $copied;
}
return $this;
}
/**
* For VirtualPage, add a canonical link tag linking to the original page
* See TRAC #6828 & http://support.google.com/webmasters/bin/answer.py?hl=en&answer=139394
*
* @param boolean $includeTitle Show default <title>-tag, set to false for custom templating
* @return string The XHTML metatags
*/
public function MetaTags($includeTitle = true) {
$tags = parent::MetaTags($includeTitle);
$copied = $this->CopyContentFrom();
if ($copied && $copied->exists()) {
$link = Convert::raw2att($copied->Link());
$tags .= "<link rel=\"canonical\" href=\"{$link}\" />\n";
}
return $tags;
}
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public function allowedChildren() {
$copy = $this->CopyContentFrom();
if($copy && $copy->exists()) {
return $copy->allowedChildren();
}
return array();
}
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public function syncLinkTracking() {
if($this->CopyContentFromID) {
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$this->HasBrokenLink = !(bool) DataObject::get_by_id('SilverStripe\\CMS\\Model\\SiteTree', $this->CopyContentFromID);
} else {
$this->HasBrokenLink = true;
}
}
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/**
* We can only publish the page if there is a published source page
*
* @param Member $member Member to check
* @return bool
*/
public function canPublish($member = null) {
return $this->isPublishable() && parent::canPublish($member);
}
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/**
* Returns true if is page is publishable by anyone at all
* Return false if the source page isn't published yet.
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*
* Note that isPublishable doesn't affect ete from live, only publish.
*/
public function isPublishable() {
// No source
if(!$this->CopyContentFrom() || !$this->CopyContentFrom()->ID) {
return false;
}
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// Unpublished source
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if(!Versioned::get_versionnumber_by_stage('SilverStripe\\CMS\\Model\\SiteTree', 'Live', $this->CopyContentFromID)) {
return false;
}
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// Default - publishable
return true;
}
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/**
* Generate the CMS fields from the fields from the original page.
*/
public function getCMSFields() {
$fields = parent::getCMSFields();
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// Setup the linking to the original page.
$copyContentFromField = new TreeDropdownField(
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"CopyContentFromID",
_t('VirtualPage.CHOOSE', "Linked Page"),
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"SilverStripe\\CMS\\Model\\SiteTree"
);
// filter doesn't let you select children of virtual pages as as source page
//$copyContentFromField->setFilterFunction(create_function('$item', 'return !($item instanceof VirtualPage);'));
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// Setup virtual fields
if($virtualFields = $this->getVirtualFields()) {
$roTransformation = new ReadonlyTransformation();
foreach($virtualFields as $virtualField) {
if($fields->dataFieldByName($virtualField))
$fields->replaceField($virtualField, $fields->dataFieldByName($virtualField)->transform($roTransformation));
}
}
$msgs = array();
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$fields->addFieldToTab("Root.Main", $copyContentFromField, "Title");
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// Create links back to the original object in the CMS
if($this->CopyContentFrom()->exists()) {
$link = "<a class=\"cmsEditlink\" href=\"admin/pages/edit/show/$this->CopyContentFromID\">"
. _t('VirtualPage.EditLink', 'edit')
. "</a>";
$msgs[] = _t(
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'VirtualPage.HEADERWITHLINK',
"This is a virtual page copying content from \"{title}\" ({link})",
array(
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'title' => $this->CopyContentFrom()->obj('Title'),
'link' => $link
)
);
} else {
$msgs[] = _t('VirtualPage.HEADER', "This is a virtual page");
$msgs[] = _t(
'SITETREE.VIRTUALPAGEWARNING',
'Please choose a linked page and save first in order to publish this page'
);
}
if(
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$this->CopyContentFromID
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&& !Versioned::get_versionnumber_by_stage('SilverStripe\\CMS\\Model\\SiteTree', 'Live', $this->CopyContentFromID)
) {
$msgs[] = _t(
'SITETREE.VIRTUALPAGEDRAFTWARNING',
'Please publish the linked page in order to publish the virtual page'
);
}
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$fields->addFieldToTab("Root.Main",
new LiteralField(
'VirtualPageMessage',
'<div class="message notice">' . implode('. ', $msgs) . '.</div>'
),
'CopyContentFromID'
);
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return $fields;
}
public function onBeforeWrite() {
parent::onBeforeWrite();
$this->refreshFromCopied();
}
/**
* Copy any fields from the copied record to bootstrap /backup
*/
protected function refreshFromCopied() {
// Skip if copied record isn't available
$source = $this->CopyContentFrom();
if(!$source || !$source->exists()) {
return;
}
// We also want to copy certain, but only if we're copying the source page for the first
// time. After this point, the user is free to customise these for the virtual page themselves.
if($this->isChanged('CopyContentFromID', 2) && $this->CopyContentFromID) {
foreach (self::config()->initially_copied_fields as $fieldName) {
$this->$fieldName = $source->$fieldName;
}
}
// Copy fields to the original record in case the class type changes
foreach($this->getVirtualFields() as $virtualField) {
$this->$virtualField = $source->$virtualField;
}
}
public function getSettingsFields() {
$fields = parent::getSettingsFields();
if(!$this->CopyContentFrom()->exists()) {
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$fields->addFieldToTab("Root.Settings",
new LiteralField(
'VirtualPageWarning',
'<div class="message notice">'
. _t(
'SITETREE.VIRTUALPAGEWARNINGSETTINGS',
'Please choose a linked page in the main content fields in order to publish'
)
. '</div>'
),
'ClassName'
);
}
return $fields;
}
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public function validate() {
$result = parent::validate();
// "Can be root" validation
$orig = $this->CopyContentFrom();
if($orig && $orig->exists() && !$orig->stat('can_be_root') && !$this->ParentID) {
$result->error(
_t(
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'VirtualPage.PageTypNotAllowedOnRoot',
'Original page type "{type}" is not allowed on the root level for this virtual page',
array('type' => $orig->i18n_singular_name())
),
'CAN_BE_ROOT_VIRTUAL'
);
}
return $result;
}
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public function updateImageTracking() {
// Doesn't work on unsaved records
if(!$this->ID) return;
// Remove CopyContentFrom() from the cache
unset($this->components['CopyContentFrom']);
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// Update ImageTracking
$this->ImageTracking()->setByIDList($this->CopyContentFrom()->ImageTracking()->column('ID'));
}
/**
* @param string $numChildrenMethod
* @return string
*/
public function CMSTreeClasses($numChildrenMethod="numChildren") {
return parent::CMSTreeClasses($numChildrenMethod) . ' VirtualPage-' . $this->CopyContentFrom()->ClassName;
}
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/**
* Allow attributes on the master page to pass
* through to the virtual page
*
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* @param string $field
* @return mixed
*/
public function __get($field) {
if(parent::hasMethod($funcName = "get$field")) {
return $this->$funcName();
}
if(parent::hasField($field) || ($field === 'ID' && !$this->exists())) {
return $this->getField($field);
}
if(($copy = $this->CopyContentFrom()) && $copy->exists()) {
return $copy->$field;
}
return null;
}
public function getField($field) {
if($this->isFieldVirtualised($field)) {
return $this->CopyContentFrom()->getField($field);
}
return parent::getField($field);
}
/**
* Check if given field is virtualised
*
* @param string $field
* @return bool
*/
public function isFieldVirtualised($field) {
// Don't defer if field is non-virtualised
$ignore = $this->getNonVirtualisedFields();
if(in_array($field, $ignore)) {
return false;
}
// Don't defer if no virtual page
$copied = $this->CopyContentFrom();
if(!$copied || !$copied->exists()) {
return false;
}
// Check if copied object has this field
return $copied->hasField($field);
}
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/**
* Pass unrecognized method calls on to the original data object
*
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* @param string $method
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* @param string $args
* @return mixed
*/
public function __call($method, $args) {
if(parent::hasMethod($method)) {
return parent::__call($method, $args);
} else {
return call_user_func_array(array($this->CopyContentFrom(), $method), $args);
}
}
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/**
* @param string $field
* @return bool
*/
public function hasField($field) {
if(parent::hasField($field)) {
return true;
}
$copy = $this->CopyContentFrom();
return $copy && $copy->exists() && $copy->hasField($field);
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}
/**
* Overwrite to also check for method on the original data object
*
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* @param string $method
* @return bool
*/
public function hasMethod($method) {
if(parent::hasMethod($method)) {
return true;
}
// Don't call property setters on copied page
if(stripos($method, 'set') === 0) {
return false;
}
$copy = $this->CopyContentFrom();
return $copy && $copy->exists() && $copy->hasMethod($method);
}
/**
* Return the "casting helper" (a piece of PHP code that when evaluated creates a casted value object) for a field
* on this object.
*
* @param string $field
* @return string
*/
public function castingHelper($field) {
$copy = $this->CopyContentFrom();
if($copy && $copy->exists() && ($helper = $copy->castingHelper($field))) {
return $helper;
}
return parent::castingHelper($field);
}
}