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