silverstripe-framework/core/model/ErrorPage.php

<?php

/**
 * @package cms
 */

/**
 * ErrorPage holds the content for the page of an error response.
 * @package cms
 */
class ErrorPage extends Page {

	static $db = array(
		"ErrorCode" => "Int",
	);

	static $defaults = array(
		"ShowInMenus" => 0,
	);
	
	/**
	 * Ensures that there is always a 404 page.
	 */
	function requireDefaultRecords() {
		parent::requireDefaultRecords();

		if(!DataObject::get_one("ErrorPage", "ErrorCode = '404'")) {
			$errorpage = new ErrorPage();
			$errorpage->ErrorCode = 404;
			$errorpage->Title = "Page not found";
			$errorpage->URLSegment = "page-not-found";
			$errorpage->ShowInMenus = false;
			$errorpage->Content = "<p>Sorry, it seems you were trying to access a page that doesn't exist.</p><p>Please check the spelling of the URL you were trying to access and try again.</p>";
			$errorpage->Status = "New page";
			$errorpage->write();
			// Don't publish, as the manifest may not be built yet
			// $errorpage->publish("Stage", "Live");
			
			Database::alteration_message("404 page created","created");
		}
	}


	function getCMSFields() {
		$fields = parent::getCMSFields();
		
		$fields->addFieldToTab(
			"Root.Content.Main", 
			new DropdownField(
				"ErrorCode",
				_t('ErrorPage.CODE', "Error code"),
				array(
					404 => "404 - Page not found",
					500 => "500 - Server error"
				)
			),
			"Content"
		);
		
		return $fields;
	}
	
	/**
	 * When an error page is published, create a static HTML page with its
	 * content, so the page can be shown even when SilverStripe is not
	 * functioning correctly before publishing this page normally.
	 * @param string|int $fromStage Place to copy from. Can be either a stage name or a version number.
	 * @param string $toStage Place to copy to. Must be a stage name.
	 * @param boolean $createNewVersion Set this to true to create a new version number.  By default, the existing version number will be copied over.
	 */
	function publish($fromStage, $toStage, $createNewVersion = false) {
		// Temporarily log out when producing this page
		$loggedInMember = Member::currentUser();
		Session::clear("loggedInAs");
		$alc_enc = isset($_COOKIE['alc_enc']) ? $_COOKIE['alc_enc'] : null;
		Cookie::set('alc_enc', null);
		
		$oldStage = Versioned::current_stage();

		// Run the page
		Requirements::clear();
		$controller = new ErrorPage_Controller($this);
		$errorContent = $controller->run( array() )->getBody();
		
		if(!file_exists("../assets")) {
			mkdir("../assets", 02775);
		}

		if($fh = fopen("../assets/error-$this->ErrorCode.html", "w")) {
			fwrite($fh, $errorContent);
			fclose($fh);
		}
		
		// Restore the version we're currently connected to.
		Versioned::reading_stage($oldStage);

		// Log back in
		if($loggedInMember) Session::set("loggedInAs", $loggedInMember->ID);
		if(isset($alc_enc)) Cookie::set('alc_enc', $alc_enc);
		
		return $this->extension_instances['Versioned']->publish($fromStage, $toStage, $createNewVersion);
	}
}

/**
 * Controller for ErrorPages.
 */
class ErrorPage_Controller extends Page_Controller {
	public function init() {
		parent::init();
		Director::set_status_code($this->failover->ErrorCode ? $this->failover->ErrorCode : 404);
	}
}


?>