<?php
/**
* FeedBuilder class.
*
* Used to build ATOM and RSS feeds data.
*/
class FeedBuilder
{
/**
* @var string Constant: RSS feed type.
*/
public static $FEED_RSS = 'rss';
/**
* @var string Constant: ATOM feed type.
*/
public static $FEED_ATOM = 'atom';
/**
* @var string Default language if the locale isn't set.
*/
public static $DEFAULT_LANGUAGE = 'en-en';
/**
* @var int Number of links to display in a feed by default.
*/
public static $DEFAULT_NB_LINKS = 50;
/**
* @var LinkDB instance.
*/
protected $linkDB;
/**
* @var string RSS or ATOM feed.
*/
protected $feedType;
/**
* @var array $_SERVER.
*/
protected $serverInfo;
/**
* @var array $_GET.
*/
protected $userInput;
/**
* @var boolean True if the user is currently logged in, false otherwise.
*/
protected $isLoggedIn;
/**
* @var boolean Use permalinks instead of direct links if true.
*/
protected $usePermalinks;
/**
* @var boolean true to hide dates in feeds.
*/
protected $hideDates;
/**
* @var string PubSub hub URL.
*/
protected $pubsubhubUrl;
/**
* @var string server locale.
*/
protected $locale;
/**
* @var DateTime Latest item date.
*/
protected $latestDate;
/**
* Feed constructor.
*
* @param LinkDB $linkDB LinkDB instance.
* @param string $feedType Type of feed.
* @param array $serverInfo $_SERVER.
* @param array $userInput $_GET.
* @param boolean $isLoggedIn True if the user is currently logged in, false otherwise.
*/
public function __construct($linkDB, $feedType, $serverInfo, $userInput, $isLoggedIn)
{
$this->linkDB = $linkDB;
$this->feedType = $feedType;
$this->serverInfo = $serverInfo;
$this->userInput = $userInput;
$this->isLoggedIn = $isLoggedIn;
}
/**
* Build data for feed templates.
*
* @return array Formatted data for feeds templates.
*/
public function buildData()
{
// Optionally filter the results:
$searchtags = !empty($this->userInput['searchtags']) ? escape($this->userInput['searchtags']) : '';
$searchterm = !empty($this->userInput['searchterm']) ? escape($this->userInput['searchterm']) : '';
if (! empty($searchtags) && ! empty($searchterm)) {
$linksToDisplay = $this->linkDB->filter(
LinkFilter::$FILTER_TAG | LinkFilter::$FILTER_TEXT,
array($searchtags, $searchterm)
);
}
elseif ($searchtags) {
$linksToDisplay = $this->linkDB->filter(LinkFilter::$FILTER_TAG, $searchtags);
}
elseif ($searchterm) {
$linksToDisplay = $this->linkDB->filter(LinkFilter::$FILTER_TEXT, $searchterm);
}
else {
$linksToDisplay = $this->linkDB;
}
$nblinksToDisplay = $this->getNbLinks(count($linksToDisplay));
// Can't use array_keys() because $link is a LinkDB instance and not a real array.
$keys = array();
foreach ($linksToDisplay as $key => $value) {
$keys[] = $key;
}
$pageaddr = escape(index_url($this->serverInfo));
$linkDisplayed = array();
for ($i = 0; $i < $nblinksToDisplay && $i < count($keys); $i++) {
$linkDisplayed[$keys[$i]] = $this->buildItem($linksToDisplay[$keys[$i]], $pageaddr);
}
$data['language'] = $this->getTypeLanguage();
$data['pubsubhub_url'] = $this->pubsubhubUrl;
$data['last_update'] = $this->getLatestDateFormatted();
$data['show_dates'] = !$this->hideDates || $this->isLoggedIn;
// Remove leading slash from REQUEST_URI.
$data['self_link'] = $pageaddr . escape(ltrim($this->serverInfo['REQUEST_URI'], '/'));
$data['index_url'] = $pageaddr;
$data['usepermalinks'] = $this->usePermalinks === true;
$data['links'] = $linkDisplayed;
return $data;
}
/**
* Build a feed item (one per shaare).
*
* @param array $link Single link array extracted from LinkDB.
* @param string $pageaddr Index URL.
*
* @return array Link array with feed attributes.
*/
protected function buildItem($link, $pageaddr)
{
$link['guid'] = $pageaddr .'?'. smallHash($link['linkdate']);
// Check for both signs of a note: starting with ? and 7 chars long.
if ($link['url'][0] === '?' && strlen($link['url']) === 7) {
$link['url'] = $pageaddr . $link['url'];
}
if ($this->usePermalinks === true) {
$permalink = '<a href="'. $link['url'] .'" title="Direct link">Direct link</a>';
} else {
$permalink = '<a href="'. $link['guid'] .'" title="Permalink">Permalink</a>';
}
$link['description'] = format_description($link['description']) . PHP_EOL .'<br>— '. $permalink;
$date = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $link['linkdate']);
if ($this->feedType == self::$FEED_RSS) {
$link['iso_date'] = $date->format(DateTime::RSS);
} else {
$link['iso_date'] = $date->format(DateTime::ATOM);
}
// Save the more recent item.
if (empty($this->latestDate) || $this->latestDate < $date) {
$this->latestDate = $date;
}
$taglist = array_filter(explode(' ', $link['tags']), 'strlen');
uasort($taglist, 'strcasecmp');
$link['taglist'] = $taglist;
return $link;
}
/**
* Assign PubSub hub URL.
*
* @param string $pubsubhubUrl PubSub hub url.
*/
public function setPubsubhubUrl($pubsubhubUrl)
{
$this->pubsubhubUrl = $pubsubhubUrl;
}
/**
* Set this to true to use permalinks instead of direct links.
*
* @param boolean $usePermalinks true to force permalinks.
*/
public function setUsePermalinks($usePermalinks)
{
$this->usePermalinks = $usePermalinks;
}
/**
* Set this to true to hide timestamps in feeds.
*
* @param boolean $hideDates true to enable.
*/
public function setHideDates($hideDates)
{
$this->hideDates = $hideDates;
}
/**
* Set the locale. Used to show feed language.
*
* @param string $locale The locale (eg. 'fr_FR.UTF8').
*/
public function setLocale($locale)
{
$this->locale = strtolower($locale);
}
/**
* Get the language according to the feed type, based on the locale:
*
* - RSS format: en-us (default: 'en-en').
* - ATOM format: fr (default: 'en').
*
* @return string The language.
*/
public function getTypeLanguage()
{
// Use the locale do define the language, if available.
if (! empty($this->locale) && preg_match('/^\w{2}[_\-]\w{2}/', $this->locale)) {
$length = ($this->feedType == self::$FEED_RSS) ? 5 : 2;
return str_replace('_', '-', substr($this->locale, 0, $length));
}
return ($this->feedType == self::$FEED_RSS) ? 'en-en' : 'en';
}
/**
* Format the latest item date found according to the feed type.
*
* Return an empty string if invalid DateTime is passed.
*
* @return string Formatted date.
*/
protected function getLatestDateFormatted()
{
if (empty($this->latestDate) || !$this->latestDate instanceof DateTime) {
return '';
}
$type = ($this->feedType == self::$FEED_RSS) ? DateTime::RSS : DateTime::ATOM;
return $this->latestDate->format($type);
}
/**
* Returns the number of link to display according to 'nb' user input parameter.
*
* If 'nb' not set or invalid, default value: $DEFAULT_NB_LINKS.
* If 'nb' is set to 'all', display all filtered links (max parameter).
*
* @param int $max maximum number of links to display.
*
* @return int number of links to display.
*/
public function getNbLinks($max)
{
if (empty($this->userInput['nb'])) {
return self::$DEFAULT_NB_LINKS;
}
if ($this->userInput['nb'] == 'all') {
return $max;
}
$intNb = intval($this->userInput['nb']);
if (! is_int($intNb) || $intNb == 0) {
return self::$DEFAULT_NB_LINKS;
}
return $intNb;
}
}
