rss-bridge/lib/FeedItem.php

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<?php
/**
* This file is part of RSS-Bridge, a PHP project capable of generating RSS and
* Atom feeds for websites that don't have one.
*
* For the full license information, please view the UNLICENSE file distributed
* with this source code.
*
* @package Core
* @license http://unlicense.org/ UNLICENSE
* @link https://github.com/rss-bridge/rss-bridge
*/
/**
* Represents a simple feed item for transformation into various feed formats.
*
* This class represents a feed item. A feed item is an entity that can be
* transformed into various feed formats. It holds a set of pre-defined
* properties:
*
* - **URI**: URI to the full article (i.e. "https://...")
* - **Title**: The title
* - **Timestamp**: A timestamp of when the item was first released
* - **Author**: Name of the author
* - **Content**: Body of the feed, as text or HTML
* - **Enclosures**: A list of links to media objects (images, videos, etc...)
* - **Categories**: A list of category names or tags to categorize the item
*
* _Note_: A feed item can have any number of additional parameters, all of which
* may or may not be transformed to the selected output format.
*
* _Remarks_: This class supports legacy items via {@see FeedItem::__construct()}
* (i.e. `$feedItem = \FeedItem($item);`). Support for legacy items may be removed
* in future versions of RSS-Bridge.
*/
class FeedItem {
/** @var string|null URI to the full article */
protected $uri = null;
/** @var string|null Title of the item */
protected $title = null;
/** @var int|null Timestamp of when the item was first released */
protected $timestamp = null;
/** @var string|null Name of the author */
protected $author = null;
/** @var string|null Body of the feed */
protected $content = null;
/** @var array List of links to media objects */
protected $enclosures = array();
/** @var array List of category names or tags */
protected $categories = array();
/** @var array Associative list of additional parameters */
protected $misc = array(); // Custom parameters
/**
* Create object from legacy item.
*
* The provided array must be an associative array of key-value-pairs, where
* keys may correspond to any of the properties of this class.
*
* Example use:
*
* ```PHP
* <?php
* $item = array();
*
* $item['uri'] = 'https://www.github.com/rss-bridge/rss-bridge/';
* $item['title'] = 'Title';
* $item['timestamp'] = strtotime('now');
* $item['autor'] = 'Unknown author';
* $item['content'] = 'Hello World!';
* $item['enclosures'] = array('https://github.com/favicon.ico');
* $item['categories'] = array('php', 'rss-bridge', 'awesome');
*
* $feedItem = new \FeedItem($item);
*
* ```
*
* The result of the code above is the same as the code below:
*
* ```PHP
* <?php
* $feedItem = \FeedItem();
*
* $feedItem->uri = 'https://www.github.com/rss-bridge/rss-bridge/';
* $feedItem->title = 'Title';
* $feedItem->timestamp = strtotime('now');
* $feedItem->autor = 'Unknown author';
* $feedItem->content = 'Hello World!';
* $feedItem->enclosures = array('https://github.com/favicon.ico');
* $feedItem->categories = array('php', 'rss-bridge', 'awesome');
* ```
*
* @param array $item (optional) A legacy item (empty: no legacy support).
* @return object A new object of this class
*/
public function __construct($item = array()) {
if(!is_array($item))
Debug::log('Item must be an array!');
foreach($item as $key => $value) {
$this->__set($key, $value);
}
}
/**
* Get current URI.
*
* Use {@see FeedItem::setURI()} to set the URI.
*
* @return string|null The URI or null if it hasn't been set.
*/
public function getURI() {
return $this->uri;
}
/**
* Set URI to the full article.
*
* Use {@see FeedItem::getURI()} to get the URI.
*
* _Note_: Removes whitespace from the beginning and end of the URI.
*
* _Remarks_: Uses the attribute "href" or "src" if the provided URI is an
* object of simple_html_dom_node.
*
* @param object|string $uri URI to the full article.
* @return self
*/
public function setURI($uri) {
$this->uri = null; // Clear previous data
if($uri instanceof simple_html_dom_node) {
if($uri->hasAttribute('href')) { // Anchor
$uri = $uri->href;
} elseif($uri->hasAttribute('src')) { // Image
$uri = $uri->src;
} else {
Debug::log('The item provided as URI is unknown!');
}
}
if(!is_string($uri)) {
Debug::log('URI must be a string!');
} elseif(!filter_var(
$uri,
FILTER_VALIDATE_URL, FILTER_FLAG_PATH_REQUIRED)) {
Debug::log('URI must include a scheme, host and path!');
} else {
$scheme = parse_url($uri, PHP_URL_SCHEME);
if($scheme !== 'http' && $scheme !== 'https') {
Debug::log('URI scheme must be "http" or "https"!');
} else {
$this->uri = trim($uri);
}
}
return $this;
}
/**
* Get current title.
*
* Use {@see FeedItem::setTitle()} to set the title.
*
* @return string|null The current title or null if it hasn't been set.
*/
public function getTitle() {
return $this->title;
}
/**
* Set title.
*
* Use {@see FeedItem::getTitle()} to get the title.
*
* _Note_: Removes whitespace from beginning and end of the title.
*
* @param string $title The title
* @return self
*/
public function setTitle($title) {
$this->title = null; // Clear previous data
if(!is_string($title)) {
Debug::log('Title must be a string!');
} else {
$this->title = trim($title);
}
return $this;
}
/**
* Get current timestamp.
*
* Use {@see FeedItem::setTimestamp()} to set the timestamp.
*
* @return int|null The current timestamp or null if it hasn't been set.
*/
public function getTimestamp() {
return $this->timestamp;
}
/**
* Set timestamp of first release.
*
* _Note_: The timestamp should represent the number of seconds since
* January 1 1970 00:00:00 GMT (Unix time).
*
* _Remarks_: If the provided timestamp is a string (not numeric), this
* function automatically attempts to parse the string using
* [strtotime](http://php.net/manual/en/function.strtotime.php)
*
* @link http://php.net/manual/en/function.strtotime.php strtotime (PHP)
* @link https://en.wikipedia.org/wiki/Unix_time Unix time (Wikipedia)
*
* @param string|int $timestamp A timestamp of when the item was first released
* @return self
*/
public function setTimestamp($timestamp) {
$this->timestamp = null; // Clear previous data
if(!is_numeric($timestamp)
&& !$timestamp = strtotime($timestamp)) {
Debug::log('Unable to parse timestamp!');
}
if($timestamp <= 0) {
Debug::log('Timestamp must be greater than zero!');
} else {
$this->timestamp = $timestamp;
}
return $this;
}
/**
* Get the current author name.
*
* Use {@see FeedItem::setAuthor()} to set the author.
*
* @return string|null The author or null if it hasn't been set.
*/
public function getAuthor() {
return $this->author;
}
/**
* Set the author name.
*
* Use {@see FeedItem::getAuthor()} to get the author.
*
* @param string $author The author name.
* @return self
*/
public function setAuthor($author) {
$this->author = null; // Clear previous data
if(!is_string($author)) {
Debug::log('Author must be a string!');
} else {
$this->author = $author;
}
return $this;
}
/**
* Get item content.
*
* Use {@see FeedItem::setContent()} to set the item content.
*
* @return string|null The item content or null if it hasn't been set.
*/
public function getContent() {
return $this->content;
}
/**
* Set item content.
*
* Note: This function casts objects of type simple_html_dom and
* simple_html_dom_node to string.
*
* Use {@see FeedItem::getContent()} to get the current item content.
*
* @param string|object $content The item content as text or simple_html_dom
* object.
* @return self
*/
public function setContent($content) {
$this->content = null; // Clear previous data
if($content instanceof simple_html_dom
|| $content instanceof simple_html_dom_node) {
$content = (string)$content;
}
if(!is_string($content)) {
Debug::log('Content must be a string!');
} else {
$this->content = $content;
}
return $this;
}
/**
* Get item enclosures.
*
* Use {@see FeedItem::setEnclosures()} to set feed enclosures.
*
* @return array Enclosures as array of enclosure URIs.
*/
public function getEnclosures() {
return $this->enclosures;
}
/**
* Set item enclosures.
*
* Use {@see FeedItem::getEnclosures()} to get the current item enclosures.
*
* @param array $enclosures Array of enclosures, where each element links to
* one enclosure.
* @return self
*/
public function setEnclosures($enclosures) {
$this->enclosures = array(); // Clear previous data
if(!is_array($enclosures)) {
Debug::log('Enclosures must be an array!');
} else {
foreach($enclosures as $enclosure) {
if(!filter_var(
$enclosure,
FILTER_VALIDATE_URL, FILTER_FLAG_PATH_REQUIRED)) {
Debug::log('Each enclosure must contain a scheme, host and path!');
} else {
$this->enclosures[] = $enclosure;
}
}
}
return $this;
}
/**
* Get item categories.
*
* Use {@see FeedItem::setCategories()} to set item categories.
*
* @param array The item categories.
*/
public function getCategories() {
return $this->categories;
}
/**
* Set item categories.
*
* Use {@see FeedItem::getCategories()} to get the current item categories.
*
* @param array $categories Array of categories, where each element defines
* a single category name.
* @return self
*/
public function setCategories($categories) {
$this->categories = array(); // Clear previous data
if(!is_array($categories)) {
Debug::log('Categories must be an array!');
} else {
foreach($categories as $category) {
if(!is_string($category)) {
Debug::log('Category must be a string!');
} else {
$this->categories[] = $category;
}
}
}
return $this;
}
/**
* Add miscellaneous elements to the item.
*
* @param string $key Name of the element.
* @param mixed $value Value of the element.
* @return self
*/
public function addMisc($key, $value) {
if(!is_string($key)) {
Debug::log('Key must be a string!');
} elseif(in_array($key, get_object_vars($this))) {
Debug::log('Key must be unique!');
} else {
$this->misc[$key] = $value;
}
return $this;
}
/**
* Transform current object to array
*
* @return array
*/
public function toArray() {
return array_merge(
array(
'uri' => $this->uri,
'title' => $this->title,
'timestamp' => $this->timestamp,
'author' => $this->author,
'content' => $this->content,
'enclosures' => $this->enclosures,
'categories' => $this->categories,
), $this->misc
);
}
/**
* Set item property
*
* Allows simple assignment to parameters. This method is slower, but easier
* to implement in some cases:
*
* ```PHP
* $item = new \FeedItem();
* $item->content = 'Hello World!';
* $item->my_id = 42;
* ```
*
* @param string $name Property name
* @param mixed $value Property value
*/
function __set($name, $value) {
switch($name) {
case 'uri': $this->setURI($value); break;
case 'title': $this->setTitle($value); break;
case 'timestamp': $this->setTimestamp($value); break;
case 'author': $this->setAuthor($value); break;
case 'content': $this->setContent($value); break;
case 'enclosures': $this->setEnclosures($value); break;
case 'categories': $this->setCategories($value); break;
default: $this->addMisc($name, $value);
}
}
/**
* Get item property
*
* Allows simple assignment to parameters. This method is slower, but easier
* to implement in some cases.
*
* @param string $name Property name
* @return mixed Property value
*/
function __get($name) {
switch($name) {
case 'uri': return $this->getURI();
case 'title': return $this->getTitle();
case 'timestamp': return $this->getTimestamp();
case 'author': return $this->getAuthor();
case 'content': return $this->getContent();
case 'enclosures': return $this->getEnclosures();
case 'categories': return $this->getCategories();
default:
if(array_key_exists($name, $this->misc))
return $this->misc[$name];
return null;
}
}
}