330 lines
9.3 KiB
PHP
330 lines
9.3 KiB
PHP
<?php
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/**
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* @file
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* Parser functions for the aggregator module.
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*/
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/**
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* Implements hook_aggregator_parse_info().
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*/
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function aggregator_aggregator_parse_info() {
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return array(
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'title' => t('Default parser'),
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'description' => t('Parses RSS, Atom and RDF feeds.'),
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);
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}
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/**
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* Implements hook_aggregator_parse().
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*/
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function aggregator_aggregator_parse($feed) {
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global $channel, $image;
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// Filter the input data.
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if (aggregator_parse_feed($feed->source_string, $feed)) {
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$modified = empty($feed->http_headers['last-modified']) ? 0 : strtotime($feed->http_headers['last-modified']);
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// Prepare the channel data.
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foreach ($channel as $key => $value) {
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$channel[$key] = trim($value);
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}
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// Prepare the image data (if any).
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foreach ($image as $key => $value) {
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$image[$key] = trim($value);
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}
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$etag = empty($feed->http_headers['etag']) ? '' : $feed->http_headers['etag'];
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// Add parsed data to the feed object.
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$feed->link = !empty($channel['link']) ? $channel['link'] : '';
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$feed->description = !empty($channel['description']) ? $channel['description'] : '';
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$feed->image = !empty($image['url']) ? $image['url'] : '';
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$feed->etag = $etag;
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$feed->modified = $modified;
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// Clear the cache.
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cache_clear_all();
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return TRUE;
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}
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return FALSE;
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}
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/**
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* Parses a feed and stores its items.
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*
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* @param $data
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* The feed data.
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* @param $feed
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* An object describing the feed to be parsed.
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*
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* @return
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* FALSE on error, TRUE otherwise.
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*/
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function aggregator_parse_feed(&$data, $feed) {
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global $items, $image, $channel;
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// Unset the global variables before we use them.
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unset($GLOBALS['element'], $GLOBALS['item'], $GLOBALS['tag']);
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$items = array();
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$image = array();
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$channel = array();
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// Parse the data.
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$xml_parser = drupal_xml_parser_create($data);
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xml_set_element_handler($xml_parser, 'aggregator_element_start', 'aggregator_element_end');
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xml_set_character_data_handler($xml_parser, 'aggregator_element_data');
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if (!xml_parse($xml_parser, $data, 1)) {
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watchdog('aggregator', 'The feed from %site seems to be broken, due to an error "%error" on line %line.', array('%site' => $feed->title, '%error' => xml_error_string(xml_get_error_code($xml_parser)), '%line' => xml_get_current_line_number($xml_parser)), WATCHDOG_WARNING);
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drupal_set_message(t('The feed from %site seems to be broken, because of error "%error" on line %line.', array('%site' => $feed->title, '%error' => xml_error_string(xml_get_error_code($xml_parser)), '%line' => xml_get_current_line_number($xml_parser))), 'error');
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return FALSE;
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}
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xml_parser_free($xml_parser);
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// We reverse the array such that we store the first item last, and the last
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// item first. In the database, the newest item should be at the top.
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$items = array_reverse($items);
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// Initialize items array.
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$feed->items = array();
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foreach ($items as $item) {
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// Prepare the item:
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foreach ($item as $key => $value) {
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$item[$key] = trim($value);
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}
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// Resolve the item's title. If no title is found, we use up to 40
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// characters of the description ending at a word boundary, but not
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// splitting potential entities.
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if (!empty($item['title'])) {
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$item['title'] = $item['title'];
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}
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elseif (!empty($item['description'])) {
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$item['title'] = preg_replace('/^(.*)[^\w;&].*?$/', "\\1", truncate_utf8($item['description'], 40));
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}
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else {
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$item['title'] = '';
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}
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// Resolve the items link.
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if (!empty($item['link'])) {
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$item['link'] = $item['link'];
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}
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else {
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$item['link'] = $feed->link;
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}
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// Atom feeds have an ID tag instead of a GUID tag.
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if (!isset($item['guid'])) {
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$item['guid'] = isset($item['id']) ? $item['id'] : '';
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}
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// Atom feeds have a content and/or summary tag instead of a description tag.
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if (!empty($item['content:encoded'])) {
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$item['description'] = $item['content:encoded'];
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}
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elseif (!empty($item['summary'])) {
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$item['description'] = $item['summary'];
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}
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elseif (!empty($item['content'])) {
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$item['description'] = $item['content'];
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}
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// Try to resolve and parse the item's publication date.
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$date = '';
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foreach (array('pubdate', 'dc:date', 'dcterms:issued', 'dcterms:created', 'dcterms:modified', 'issued', 'created', 'modified', 'published', 'updated') as $key) {
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if (!empty($item[$key])) {
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$date = $item[$key];
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break;
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}
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}
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$item['timestamp'] = strtotime($date);
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if ($item['timestamp'] === FALSE) {
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$item['timestamp'] = aggregator_parse_w3cdtf($date); // Aggregator_parse_w3cdtf() returns FALSE on failure.
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}
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// Resolve dc:creator tag as the item author if author tag is not set.
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if (empty($item['author']) && !empty($item['dc:creator'])) {
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$item['author'] = $item['dc:creator'];
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}
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$item += array('author' => '', 'description' => '');
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// Store on $feed object. This is where processors will look for parsed items.
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$feed->items[] = $item;
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}
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return TRUE;
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}
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/**
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* Performs an action when an opening tag is encountered.
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*
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* Callback function used by xml_parse() within aggregator_parse_feed().
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*/
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function aggregator_element_start($parser, $name, $attributes) {
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global $item, $element, $tag, $items, $channel;
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$name = strtolower($name);
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switch ($name) {
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case 'image':
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case 'textinput':
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case 'summary':
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case 'tagline':
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case 'subtitle':
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case 'logo':
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case 'info':
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$element = $name;
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break;
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case 'id':
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case 'content':
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if ($element != 'item') {
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$element = $name;
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}
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case 'link':
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// According to RFC 4287, link elements in Atom feeds without a 'rel'
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// attribute should be interpreted as though the relation type is
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// "alternate".
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if (!empty($attributes['HREF']) && (empty($attributes['REL']) || $attributes['REL'] == 'alternate')) {
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if ($element == 'item') {
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$items[$item]['link'] = $attributes['HREF'];
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}
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else {
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$channel['link'] = $attributes['HREF'];
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}
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}
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break;
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case 'item':
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$element = $name;
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$item += 1;
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break;
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case 'entry':
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$element = 'item';
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$item += 1;
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break;
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}
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$tag = $name;
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}
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/**
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* Performs an action when a closing tag is encountered.
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*
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* Callback function used by xml_parse() within aggregator_parse_feed().
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*/
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function aggregator_element_end($parser, $name) {
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global $element;
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switch ($name) {
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case 'image':
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case 'textinput':
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case 'item':
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case 'entry':
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case 'info':
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$element = '';
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break;
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case 'id':
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case 'content':
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if ($element == $name) {
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$element = '';
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}
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}
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}
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/**
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* Performs an action when data is encountered.
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*
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* Callback function used by xml_parse() within aggregator_parse_feed().
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*/
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function aggregator_element_data($parser, $data) {
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global $channel, $element, $items, $item, $image, $tag;
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$items += array($item => array());
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switch ($element) {
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case 'item':
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$items[$item] += array($tag => '');
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$items[$item][$tag] .= $data;
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break;
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case 'image':
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case 'logo':
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$image += array($tag => '');
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$image[$tag] .= $data;
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break;
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case 'link':
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if ($data) {
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$items[$item] += array($tag => '');
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$items[$item][$tag] .= $data;
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}
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break;
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case 'content':
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$items[$item] += array('content' => '');
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$items[$item]['content'] .= $data;
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break;
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case 'summary':
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$items[$item] += array('summary' => '');
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$items[$item]['summary'] .= $data;
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break;
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case 'tagline':
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case 'subtitle':
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$channel += array('description' => '');
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$channel['description'] .= $data;
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break;
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case 'info':
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case 'id':
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case 'textinput':
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// The sub-element is not supported. However, we must recognize
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// it or its contents will end up in the item array.
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break;
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default:
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$channel += array($tag => '');
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$channel[$tag] .= $data;
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}
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}
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/**
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* Parses the W3C date/time format, a subset of ISO 8601.
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*
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* PHP date parsing functions do not handle this format. See
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* http://www.w3.org/TR/NOTE-datetime for more information. Originally from
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* MagpieRSS (http://magpierss.sourceforge.net/).
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*
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* @param $date_str
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* A string with a potentially W3C DTF date.
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*
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* @return
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* A timestamp if parsed successfully or FALSE if not.
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*/
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function aggregator_parse_w3cdtf($date_str) {
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if (preg_match('/(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2})(:(\d{2}))?(?:([-+])(\d{2}):?(\d{2})|(Z))?/', $date_str, $match)) {
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list($year, $month, $day, $hours, $minutes, $seconds) = array($match[1], $match[2], $match[3], $match[4], $match[5], $match[6]);
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// Calculate the epoch for current date assuming GMT.
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$epoch = gmmktime($hours, $minutes, $seconds, $month, $day, $year);
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if ($match[10] != 'Z') { // Z is zulu time, aka GMT
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list($tz_mod, $tz_hour, $tz_min) = array($match[8], $match[9], $match[10]);
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// Zero out the variables.
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if (!$tz_hour) {
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$tz_hour = 0;
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}
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if (!$tz_min) {
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$tz_min = 0;
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}
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$offset_secs = (($tz_hour * 60) + $tz_min) * 60;
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// Is timezone ahead of GMT? If yes, subtract offset.
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if ($tz_mod == '+') {
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$offset_secs *= -1;
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}
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$epoch += $offset_secs;
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}
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return $epoch;
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}
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else {
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return FALSE;
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}
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}
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