silverstripe-cms/code/Model/RedirectorPage.php

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<?php
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namespace SilverStripe\CMS\Model;
use Page;
use SilverStripe\Forms\FieldList;
use SilverStripe\Forms\HeaderField;
use SilverStripe\Forms\OptionsetField;
use SilverStripe\Forms\TextField;
use SilverStripe\Forms\TreeDropdownField;
use SilverStripe\Versioned\Versioned;
/**
* A redirector page redirects when the page is visited.
*
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* @property string $RedirectionType Either 'Internal' or 'External'
* @property string $ExternalURL URL to redirect to if $RedirectionType is 'External'
* @property int $LinkToID
* @method SiteTree LinkTo() Page to link to if $RedirectionType is 'Internal'
*/
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class RedirectorPage extends Page
{
private static $description = 'Redirects to an internal page or an external URL';
private static $icon_class = 'font-icon-p-redirect';
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private static $db = array(
"RedirectionType" => "Enum('Internal,External','Internal')",
"ExternalURL" => "Varchar(2083)" // 2083 is the maximum length of a URL in Internet Explorer.
);
private static $defaults = array(
"RedirectionType" => "Internal"
);
private static $has_one = array(
"LinkTo" => SiteTree::class,
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);
private static $table_name = 'RedirectorPage';
/**
* Returns this page if the redirect is external, otherwise
* returns the target page.
* @return SiteTree
*/
public function ContentSource()
{
if ($this->RedirectionType == 'Internal') {
return $this->LinkTo();
} else {
return $this;
}
}
/**
* Return the the link that should be used for this redirector page, in navigation, etc.
* If the redirectorpage has been appropriately configured, then it will return the redirection
* destination, to prevent unnecessary 30x redirections. However, if it's misconfigured, then
* it will return a link to itself, which will then display an error message.
*
* @param string $action
* @return string
*/
public function Link($action = null)
{
$link = $this->redirectionLink();
if ($link) {
return $link;
} else {
return $this->regularLink($action);
}
}
/**
* Return the normal link directly to this page. Once you visit this link, a 30x redirection
* will take you to your final destination.
*
* @param string $action
* @return string
*/
public function regularLink($action = null)
{
return parent::Link($action);
}
/**
* Return the link that we should redirect to.
* Only return a value if there is a legal redirection destination.
*/
public function redirectionLink()
{
// Check external redirect
if ($this->RedirectionType == 'External') {
return $this->ExternalURL ?: null;
}
// Check internal redirect
/** @var SiteTree $linkTo */
$linkTo = $this->LinkToID ? SiteTree::get()->byID($this->LinkToID) : null;
if (empty($linkTo)) {
return null;
}
// We shouldn't point to ourselves - that would create an infinite loop! Return null since we have a
// bad configuration
if ($this->ID == $linkTo->ID) {
return null;
}
// If we're linking to another redirectorpage then just return the URLSegment, to prevent a cycle of redirector
// pages from causing an infinite loop. Instead, they will cause a 30x redirection loop in the browser, but
// this can be handled sufficiently gracefully by the browser.
if ($linkTo instanceof RedirectorPage) {
return $linkTo->regularLink();
}
// For all other pages, just return the link of the page.
return $linkTo->Link();
}
public function syncLinkTracking()
{
if ($this->RedirectionType == 'Internal') {
if ($this->LinkToID) {
$this->HasBrokenLink = Versioned::get_by_stage(SiteTree::class, Versioned::DRAFT)
->filter('ID', $this->LinkToID)
->count() === 0;
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} else {
// An incomplete redirector page definitely has a broken link
$this->HasBrokenLink = true;
}
} else {
// TODO implement checking of a remote site
$this->HasBrokenLink = false;
}
}
protected function onBeforeWrite()
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{
parent::onBeforeWrite();
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if ($this->ExternalURL && substr($this->ExternalURL, 0, 2) !== '//') {
$urlParts = parse_url($this->ExternalURL);
if ($urlParts) {
if (empty($urlParts['scheme'])) {
// no scheme, assume http
$this->ExternalURL = 'http://' . $this->ExternalURL;
} elseif (!in_array($urlParts['scheme'], array(
'http',
'https',
))) {
// we only allow http(s) urls
$this->ExternalURL = '';
}
} else {
// malformed URL to reject
$this->ExternalURL = '';
}
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}
}
public function getCMSFields()
{
$this->beforeUpdateCMSFields(function (FieldList $fields) {
$fields->removeByName('Content', true);
// Remove all metadata fields, does not apply for redirector pages
$fields->removeByName('Metadata');
$fields->addFieldsToTab(
'Root.Main',
array(
new HeaderField('RedirectorDescHeader', _t(__CLASS__.'.HEADER', "This page will redirect users to another page")),
new OptionsetField(
"RedirectionType",
_t(__CLASS__.'.REDIRECTTO', "Redirect to"),
array(
"Internal" => _t(__CLASS__.'.REDIRECTTOPAGE', "A page on your website"),
"External" => _t(__CLASS__.'.REDIRECTTOEXTERNAL', "Another website"),
),
"Internal"
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),
new TreeDropdownField(
"LinkToID",
_t(__CLASS__.'.YOURPAGE', "Page on your website"),
SiteTree::class
),
new TextField("ExternalURL", _t(__CLASS__.'.OTHERURL', "Other website URL"))
)
);
});
return parent::getCMSFields();
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}
// Don't cache RedirectorPages
public function subPagesToCache()
{
return array();
}
}