silverstripe-cms/code/Model/VirtualPage.php

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<?php
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namespace SilverStripe\CMS\Model;
use Page;
use SilverStripe\Admin\AdminRootController;
use SilverStripe\Core\Convert;
use SilverStripe\Dev\Deprecation;
use SilverStripe\Forms\FieldList;
use SilverStripe\Forms\LiteralField;
use SilverStripe\Forms\ReadonlyTransformation;
use SilverStripe\Forms\TreeDropdownField;
use SilverStripe\ORM\DataObject;
use SilverStripe\ORM\ValidationResult;
use SilverStripe\Security\Member;
use SilverStripe\Versioned\Versioned;
use SilverStripe\View\HTML;
/**
* 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
*/
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class VirtualPage extends Page
{
private static $description = 'Displays the content of another page';
private static $icon_class = 'font-icon-p-virtual';
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public static $virtualFields;
/**
* @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 = [
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"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 = [
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'ShowInMenus',
'ShowInSearch',
'URLSegment',
];
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private static $has_one = [
"CopyContentFrom" => SiteTree::class,
];
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private static $owns = [
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"CopyContentFrom",
];
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private static $db = [
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"VersionID" => "Int",
];
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private static $table_name = 'VirtualPage';
/**
* 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 || !$record->exists()) {
return [];
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}
// Diff db with non-virtual fields
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$fields = array_keys(static::getSchema()->fieldSpecs($record) ?? []);
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$nonVirtualFields = $this->getNonVirtualisedFields();
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return array_diff($fields ?? [], $nonVirtualFields);
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}
/**
* List of fields or properties to never virtualise
*
* @return array
*/
public function getNonVirtualisedFields()
{
$config = self::config();
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return array_merge(
$config->get('non_virtual_fields'),
$config->get('initially_copied_fields')
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);
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}
public function setCopyContentFromID($val)
{
// Sanity check to prevent pages virtualising other virtual pages
if ($val && DataObject::get_by_id(SiteTree::class, $val) instanceof VirtualPage) {
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$val = 0;
}
return $this->setField("CopyContentFromID", $val);
}
public function ContentSource()
{
$copied = $this->CopyContentFrom();
if ($copied && $copied->exists()) {
return $copied;
}
return $this;
}
/**
* @return array
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*/
public function MetaComponents()
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{
$tags = parent::MetaComponents();
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$copied = $this->CopyContentFrom();
if ($copied && $copied->exists()) {
$tags['canonical'] = [
'tag' => 'link',
'attributes' => [
'rel' => 'canonical',
'href' => $copied->AbsoluteLink(),
],
];
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}
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return $tags;
}
public function allowedChildren()
{
$copy = $this->CopyContentFrom();
if ($copy && $copy->exists()) {
return $copy->allowedChildren();
}
return [];
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}
public function syncLinkTracking()
{
if ($this->CopyContentFromID) {
$this->HasBrokenLink = Versioned::get_by_stage(SiteTree::class, Versioned::DRAFT)
->filter('ID', $this->CopyContentFromID)
->count() === 0;
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} else {
$this->HasBrokenLink = true;
}
}
/**
* 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);
}
/**
* Returns true if is page is publishable by anyone at all
* Return false if the source page isn't published yet.
*
* Note that isPublishable doesn't affect ete from live, only publish.
*/
public function isPublishable()
{
// No source
if (!$this->CopyContentFrom() || !$this->CopyContentFrom()->ID) {
return false;
}
// Unpublished source
if (!Versioned::get_versionnumber_by_stage(
SiteTree::class,
'Live',
$this->CopyContentFromID
)) {
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return false;
}
// Default - publishable
return true;
}
/**
* Generate the CMS fields from the fields from the original page.
*/
public function getCMSFields()
{
$this->beforeUpdateCMSFields(function (FieldList $fields) {
// Setup the linking to the original page.
$copyContentFromField = TreeDropdownField::create(
'CopyContentFromID',
_t(self::class . '.CHOOSE', "Linked Page"),
SiteTree::class
);
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// Setup virtual fields
if ($virtualFields = $this->getVirtualFields()) {
$roTransformation = new ReadonlyTransformation();
foreach ($virtualFields as $virtualField) {
if ($fields->dataFieldByName($virtualField)) {
$fields->replaceField(
$virtualField,
$fields->dataFieldByName($virtualField)->transform($roTransformation)
);
}
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}
}
$msgs = [];
$fields->addFieldToTab('Root.Main', $copyContentFromField, 'Title');
// Create links back to the original object in the CMS
if ($this->CopyContentFrom()->exists()) {
$link = HTML::createTag(
'a',
[
'class' => 'cmsEditlink',
'href' => AdminRootController::get_admin_route() . '/pages/edit/show/' . $this->CopyContentFromID,
],
_t(self::class . '.EditLink', 'edit')
);
$msgs[] = _t(
self::class . '.HEADERWITHLINK',
"This is a virtual page copying content from \"{title}\" ({link})",
[
'title' => $this->CopyContentFrom()->obj('Title'),
'link' => $link,
]
);
} else {
$msgs[] = _t(self::class . '.HEADER', "This is a virtual page");
$msgs[] = _t(
'SilverStripe\\CMS\\Model\\SiteTree.VIRTUALPAGEWARNING',
'Please choose a linked page and save first in order to publish this page'
);
}
if ($this->CopyContentFromID && !Versioned::get_versionnumber_by_stage(
SiteTree::class,
Versioned::LIVE,
$this->CopyContentFromID
)) {
$msgs[] = _t(
'SilverStripe\\CMS\\Model\\SiteTree.VIRTUALPAGEDRAFTWARNING',
'Please publish the linked page in order to publish the virtual page'
);
}
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$fields->addFieldToTab("Root.Main", new LiteralField(
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'VirtualPageMessage',
'<div class="alert alert-info">' . implode('. ', $msgs) . '.</div>'
), 'CopyContentFromID');
});
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return parent::getCMSFields();
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}
public function onBeforeWrite()
{
$this->refreshFromCopied();
parent::onBeforeWrite();
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}
/**
* 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()->get('initially_copied_fields') as $fieldName) {
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$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()) {
$fields->addFieldToTab(
"Root.Settings",
new LiteralField(
'VirtualPageWarning',
'<div class="message notice">'
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. _t(
'SilverStripe\\CMS\\Model\\SiteTree.VIRTUALPAGEWARNINGSETTINGS',
'Please choose a linked page in the main content fields in order to publish'
)
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. '</div>'
),
'ClassName'
);
}
return $fields;
}
public function validate()
{
$result = parent::validate();
// "Can be root" validation
$orig = $this->CopyContentFrom();
if ($orig && $orig->exists() && !$orig->config()->get('can_be_root') && !$this->ParentID) {
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$result->addError(
_t(
self::class . '.PageTypNotAllowedOnRoot',
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'Original page type "{type}" is not allowed on the root level for this virtual page',
['type' => $orig->i18n_singular_name()]
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),
ValidationResult::TYPE_ERROR,
'CAN_BE_ROOT_VIRTUAL'
);
}
return $result;
}
/**
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* @deprecated 4.2.0 Will be removed without equivalent functionality to replace it
*/
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public function updateImageTracking()
{
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Deprecation::notice('4.2.0', 'Will be removed without equivalent functionality to replace it');
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// Doesn't work on unsaved records
if (!$this->isInDB()) {
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return;
}
// Remove CopyContentFrom() from the cache
unset($this->components['CopyContentFrom']);
// Update ImageTracking
$copyContentFrom = $this->CopyContentFrom();
if (!$copyContentFrom || !$copyContentFrom->isInDB()) {
return;
}
$this->FileTracking()->setByIDList($copyContentFrom->FileTracking()->column('ID'));
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}
public function CMSTreeClasses()
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{
$parentClass = sprintf(
' VirtualPage-%s',
Convert::raw2htmlid($this->CopyContentFrom()->ClassName)
);
return parent::CMSTreeClasses() . $parentClass;
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}
/**
* Use the target page's class name for fetching templates - as we need to take on its appearance
*
* @param string $suffix
* @return array
*/
public function getViewerTemplates($suffix = '')
{
$copy = $this->CopyContentFrom();
if ($copy && $copy->exists()) {
return $copy->getViewerTemplates($suffix);
}
return parent::getViewerTemplates($suffix);
}
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/**
* Allow attributes on the master page to pass
* through to the virtual page
*
* @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 = $this->getNonVirtualisedFields();
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if (in_array($field, $ignore ?? [])) {
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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);
}
/**
* Pass unrecognized method calls on to the original data object
*
* @param string $method
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* @param array $args
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* @return mixed
*/
public function __call($method, $args)
{
if (parent::hasMethod($method)) {
return parent::__call($method, $args);
} else {
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return call_user_func_array([$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);
}
/**
* @param string $method
* @return bool
*/
public function hasMethod($method)
{
if (parent::hasMethod($method)) {
return true;
}
$copy = $this->CopyContentFrom();
return $copy && $copy->exists() && $copy->hasMethod($method);
}
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/**
* 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);
}
/**
* {@inheritdoc}
*/
public function allMethodNames($custom = false)
{
$methods = parent::allMethodNames($custom);
if ($copy = $this->CopyContentFrom()) {
$methods = array_merge($methods, $copy->allMethodNames($custom));
}
return $methods;
}
/**
* {@inheritdoc}
*/
public function getControllerName()
{
if ($copy = $this->CopyContentFrom()) {
return $copy->getControllerName();
}
return parent::getControllerName();
}
}