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<?php
/**
* RSSFeed class
*
* This class is used to create an RSS feed.
* @todo Improve documentation
* @package framework
* @subpackage integration
*/
class RSSFeed extends ViewableData {
/**
* Casting information for this object's methods.
* Let's us use $Title.XML in templates
*/
public static $casting = array(
"Title" => "Varchar",
"Description" => "Varchar",
);
/**
* Holds the feed entries
*
* @var SS_List
*/
protected $entries;
/**
* Title of the feed
*
* @var string
*/
protected $title;
/**
* Description of the feed
*
* @var string
*/
protected $description;
/**
* Link to the feed
*
* @var string
*/
protected $link;
/**
* Name of the title field of feed entries
*
* @var string
*/
protected $titleField;
/**
* Name of the description field of feed entries
*
* @var string
*/
protected $descriptionField;
/**
* Name of the author field of feed entries
*
* @var string
*/
protected $authorField;
/**
* Last modification of the RSS feed
*
* @var int Unix timestamp of the last modification
*/
protected $lastModified;
/**
* ETag for the RSS feed (used for client-site caching)
*
* @var string The value for the HTTP ETag header.
*/
protected $etag;
/**
* @var string
*/
protected $template = 'RSSFeed';
/**
* Constructor
*
* @param SS_List $entries RSS feed entries
* @param string $link Link to the feed
* @param string $title Title of the feed
* @param string $description Description of the field
* @param string $titleField Name of the field that should be used for the
* titles for the feed entries
* @param string $descriptionField Name of the field that should be used
* for the description for the feed
* entries
* @param string $authorField Name of the field that should be used for
* the author for the feed entries
* @param int $lastModified Unix timestamp of the latest modification
* (latest posting)
* @param string $etag The ETag is an unique identifier that is changed
* every time the representation does
*/
function __construct(SS_List $entries, $link, $title,
$description = null, $titleField = "Title",
$descriptionField = "Content", $authorField = null,
$lastModified = null, $etag = null) {
$this->entries = $entries;
$this->link = $link;
$this->description = $description;
$this->title = $title;
$this->titleField = $titleField;
$this->descriptionField = $descriptionField;
$this->authorField = $authorField;
$this->lastModified = $lastModified;
$this->etag = $etag;
parent::__construct();
}
/**
* Include an link to the feed
*
* @param string $url URL of the feed
* @param string $title Title to show
*/
static function linkToFeed($url, $title = null) {
$title = Convert::raw2xml($title);
Requirements::insertHeadTags(
'<link rel="alternate" type="application/rss+xml" title="' . $title .
'" href="' . $url . '" />');
}
/**
* Get the RSS feed entries
*
* @return SS_List Returns the {@link RSSFeed_Entry} objects.
*/
function Entries() {
$output = new ArrayList();
if(isset($this->entries)) {
foreach($this->entries as $entry) {
$output->push(new RSSFeed_Entry($entry, $this->titleField, $this->descriptionField, $this->authorField));
}
}
return $output;
}
/**
* Get the title of thisfeed
*
* @return string Returns the title of the feed.
*/
function Title() {
return $this->title;
}
/**
* Get the URL of this feed
*
* @param string $action
* @return string Returns the URL of the feed.
*/
function Link($action = null) {
return Controller::join_links(Director::absoluteURL($this->link), $action);
}
/**
* Get the description of this feed
*
* @return string Returns the description of the feed.
*/
function Description() {
return $this->description;
}
/**
* Output the feed to the browser
*/
function outputToBrowser() {
if(is_int($this->lastModified)) {
HTTP::register_modification_timestamp($this->lastModified);
header('Last-Modified: ' . gmdate("D, d M Y H:i:s", $this->lastModified) . ' GMT');
}
if(!empty($this->etag)) {
HTTP::register_etag($this->etag);
}
$body = $this->feedContent();
HTTP::add_cache_headers();
header("Content-type: text/xml");
echo $body;
}
/**
* Return the content of the RSS feed.
*
* Also temporarily disabled source file comments, and restores
* to previous state once content has been rendered.
*
* @return string
*/
function feedContent() {
$prevState = SSViewer::get_source_file_comments();
SSViewer::set_source_file_comments(false);
$content = str_replace('&nbsp;', '&#160;', $this->renderWith($this->getTemplate()));
SSViewer::set_source_file_comments($prevState);
return $content;
}
/**
* Set the name of the template to use. Actual template will be resolved
* via the standard template inclusion process.
*
* @param string
*/
public function setTemplate($template) {
$this->template = $template;
}
/**
* Returns the name of the template to use.
*
* @return string
*/
public function getTemplate() {
return $this->template;
}
}
/**
* RSSFeed_Entry class
*
* This class is used for entries of an RSS feed.
*
* @see RSSFeed
* @package framework
* @subpackage integration
*/
class RSSFeed_Entry extends ViewableData {
/**
* The object that represents the item, it contains all the data.
*
* @var mixed
*/
protected $failover;
/**
* Name of the title field of feed entries
*
* @var string
*/
protected $titleField;
/**
* Name of the description field of feed entries
*
* @var string
*/
protected $descriptionField;
/**
* Name of the author field of feed entries
*
* @var string
*/
protected $authorField;
/**
* Create a new RSSFeed entry.
*/
function __construct($entry, $titleField, $descriptionField,
$authorField) {
$this->failover = $entry;
$this->titleField = $titleField;
$this->descriptionField = $descriptionField;
$this->authorField = $authorField;
parent::__construct();
}
/**
* Get the description of this entry
*
* @return string Returns the description of the entry.
*/
function Title() {
return $this->rssField($this->titleField, 'Varchar');
}
/**
* Get the description of this entry
*
* @return string Returns the description of the entry.
*/
function Description() {
return $this->rssField($this->descriptionField, 'Text');
}
/**
* Get the author of this entry
*
* @return string Returns the author of the entry.
*/
function Author() {
if($this->authorField) return $this->failover->obj($this->authorField);
}
/**
* Return the named field as an obj() call from $this->failover.
* Default to the given class if there's no casting information.
*/
function rssField($fieldName, $defaultClass = 'Varchar') {
if($fieldName) {
if($this->failover->castingHelper($fieldName)) {
$value = $this->failover->$fieldName;
$obj = $this->failover->obj($fieldName);
$obj->setValue($value);
return $obj;
} else {
$obj = new $defaultClass($fieldName);
$obj->setValue($this->failover->XML_val($fieldName));
return $obj;
}
}
}
/**
* Get a link to this entry
*
* @return string Returns the URL of this entry
*/
function AbsoluteLink() {
if($this->failover->hasMethod('AbsoluteLink')) return $this->failover->AbsoluteLink();
else if($this->failover->hasMethod('Link')) return Director::absoluteURL($this->failover->Link());
else user_error($this->failover->class . " object has neither an AbsoluteLink nor a Link method. Can't put a link in the RSS feed", E_USER_WARNING);
}
}
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