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<?php
namespace Alpha\Util\Feed;
use Alpha\Util\Logging\Logger;
use Alpha\Exception\IllegalArguementException;
use Alpha\Model\ActiveRecord;
use DOMDocument;
use DOMElement;
/**
* Base feed class for generating syndication feeds.
*
* @since 1.0
*
* @author John Collins <dev@alphaframework.org>
* @license http://www.opensource.org/licenses/bsd-license.php The BSD License
* @copyright Copyright (c) 2018, John Collins (founder of Alpha Framework).
* All rights reserved.
*
* <pre>
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the
* following conditions are met:
*
* * Redistributions of source code must retain the above
* copyright notice, this list of conditions and the
* following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the
* following disclaimer in the documentation and/or other
* materials provided with the distribution.
* * Neither the name of the Alpha Framework nor the names
* of its contributors may be used to endorse or promote
* products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
* </pre>
*/
abstract class Feed
{
/**
* The DOMDocument object used to create the feed.
*
* @var DOMDocument
*
* @since 1.0
*/
protected $rssDoc;
/**
* The DOMElement object used to hold the item or entry elements.
*
* @var DOMElement
*
* @since 1.0
*/
protected $docElement;
/**
* Holds the DOMElement to which metadata is added for the feed.
*
* @var DOMElement
*
* @since 1.0
*/
protected $root;
/**
* The actual root tag used in each feed type.
*
* @var string
*
* @since 1.0
*/
protected $rootTag;
/**
* An array of feed items.
*
* @var array
*
* @since 1.0
*/
protected $items;
/**
* If the feed format has a channel or not.
*
* @var bool
*
* @since 1.0
*/
protected $hasChannel = true;
/**
* Maps the tags to the feed-specific tags.
*
* @var array
*
* @since 1.0
*/
protected $tagMap = array('item' => 'item', 'feeddesc' => 'description', 'itemdesc' => 'description');
/**
* The Record which we will serve up in this feed.
*
* @var \Alpha\Model\ActiveRecord
*
* @since 1.0
*/
private $record;
/**
* An array containing Record field names -> RSS field name mappings.
*
* @var array
*
* @since 1.0
*/
protected $fieldNameMappings;
/**
* The XML namespace to use in the generated feed.
*
* @var string
*/
protected $nameSpace;
/**
* Trace logger.
*
* @var \Alpha\Util\Logging\Logger
*
* @since 1.0
*/
private static $logger = null;
/**
* The constructor.
*
* @param string $RecordName The fully-qualifified classname of the Record to render a feed for.
* @param string $title The title of the feed.
* @param string $url The base URL for the feed.
* @param string $description The description of the feed.
* @param string $pubDate The publish date, only used in Atom feeds.
* @param int $id The feed id, only used in Atom feeds.
* @param int $limit The amount of items to render in the feed.
*
* @throws IllegalArguementException
*
* @since 1.0
*/
public function __construct($RecordName, $title, $url, $description, $pubDate = null, $id = null, $limit = 10)
{
self::$logger = new Logger('Feed');
self::$logger->debug('>>__construct(RecordName=['.$RecordName.'], title=['.$title.'], url=['.$url.'], description=['.$description.'], pubDate=['.$pubDate.'], id=['.$id.'], limit=['.$limit.'])');
$this->rssDoc = new DOMDocument();
$this->rssDoc->loadXML($this->rootTag);
$this->docElement = $this->rssDoc->documentElement;
if (!class_exists($RecordName)) {
throw new IllegalArguementException('Unable to load the class definition for the class ['.$RecordName.'] while trying to generate a feed!');
}
$this->record = new $RecordName();
if ($this->hasChannel) {
$root = $this->createFeedElement('channel');
$this->root = $this->docElement->appendChild($root);
} else {
$this->root = $this->docElement;
}
$this->createRSSNode('feed', $this->root, $title, $url, $description, $pubDate, $id);
self::$logger->debug('<<__construct');
}
/**
* Method to load all of the Record items to the feed from the database, from the newest to the
* $limit provided.
*
* @param int $limit The amount of items to render in the feed.
* @param string $sortBy The name of the field to sort the feed by.
*
* @since 1.0
*/
public function loadRecords($limit, $sortBy)
{
$Records = $this->record->loadAll(0, $limit, $sortBy, 'DESC');
ActiveRecord::disconnect();
foreach ($Records as $Record) {
$this->addRecord($Record);
}
}
/**
* Method for adding a Record to the current feed.
*
* @param \Alpha\Model\ActiveRecord $Record
*/
public function addRecord($Record)
{
$title = $Record->get($this->fieldNameMappings['title']);
$url = $Record->get($this->fieldNameMappings['url']);
if (isset($this->fieldNameMappings['description'])) {
$description = $Record->get($this->fieldNameMappings['description']);
} else {
$description = '';
}
if (isset($this->fieldNameMappings['pubDate'])) {
$dateTS = strtotime($Record->get($this->fieldNameMappings['pubDate']));
$pubDate = date(DATE_ATOM, $dateTS);
} else {
$pubDate = '';
}
if (isset($this->fieldNameMappings['id'])) {
$id = $Record->get($this->fieldNameMappings['id']);
} else {
$id = '';
}
$this->addItem($title, $url, $description, $pubDate, $id);
}
/**
* Method for mapping Record fieldnames to feed field names.
*
* @param string $title The title of the feed.
* @param string $url The base URL for the feed.
* @param string $description The description of the feed.
* @param string $pubDate The publish date, only used in Atom feeds.
* @param int $id The feed id, only used in Atom feeds.
*
* @since 1.0
*/
public function setFieldMappings($title, $url, $description = null, $pubDate = null, $id = null)
{
$this->fieldNameMappings = array(
'title' => $title,
'url' => $url,
);
if (isset($description)) {
$this->fieldNameMappings['description'] = $description;
}
if (isset($pubDate)) {
$this->fieldNameMappings['pubDate'] = $pubDate;
}
if (isset($id)) {
$this->fieldNameMappings['id'] = $id;
}
}
/**
* Method for creating a new feed element.
*
* @param string $name The name of the element.
* @param string $value The value of the element.
*
* @return DOMElement
*
* @since 1.0
*/
protected function createFeedElement($name, $value = null)
{
$value = htmlspecialchars($value);
if ($this->nameSpace == null) {
return $this->rssDoc->createElement($name, $value);
} else {
return $this->rssDoc->createElementNS($this->nameSpace, $name, $value);
}
}
/**
* Method for creating link elements (note that Atom has a different format).
*
* @param DOMElement $parent The parent element.
* @param string $url The URL for the link.
*
* @since 1.0
*/
protected function createLink($parent, $url)
{
$link = $this->createFeedElement('link', $url);
$parent->appendChild($link);
}
/**
* Method for creating an RSS node with a title, url and description.
*
* @param int $type Can be either (item|feed) to indicate the type of node we are creating.
* @param DOMElement $parent The parent element.
* @param string $title The title of the feed.
* @param string $url The base URL for the feed.
* @param string $description The description of the feed.
* @param string $pubDate The publish date, only used in Atom feeds.
* @param int $id The feed id, only used in Atom feeds.
*
* @since 1.0
*
* @throws \Alpha\Exception\IllegalArguementException
*/
protected function createRSSNode($type, $parent, $title, $url, $description, $pubDate = null, $id = null)
{
$this->createLink($parent, $url);
$title = $this->createFeedElement('title', $title);
$parent->appendChild($title);
if ($type == 'item') {
$titletag = $this->tagMap['itemdesc'];
} elseif ($type == 'feed') {
$titletag = $this->tagMap['feeddesc'];
} else {
throw new IllegalArguementException('The type paramater ['.$type.'] provided is invalid!');
}
$description = $this->createFeedElement($titletag, $description);
$parent->appendChild($description);
// id elements and updated elements are just for Atom!
if ($id !== null) {
$idnode = $this->createFeedElement('id', $id);
$parent->appendChild($idnode);
}
if ($pubDate !== null) {
$datenode = $this->createFeedElement('updated', $pubDate);
$parent->appendChild($datenode);
}
}
/**
* Method for adding an item to a feed.
*
* @param string $title The title of the feed.
* @param string $url The base URL for the feed.
* @param string $description The description of the feed.
* @param string $pubDate The publish date, only used in Atom feeds.
* @param int $id The feed id, only used in Atom feeds.
*
* @since 1.0
*/
protected function addItem($title, $url, $description = null, $pubDate = null, $id = null)
{
$item = $this->createFeedElement($this->tagMap['item']);
if ($this->docElement->appendChild($item)) {
$this->createRSSNode('item', $item, $title, $url, $description, $pubDate, $id);
}
}
/**
* Returns the formatted XML for the feed as a string.
*
* @return string
*
* @since 1.0
*/
public function render()
{
if ($this->rssDoc) {
$this->rssDoc->formatOutput = true;
return $this->rssDoc->saveXML();
} else {
return '';
}
}
}