announcements_feed.inc

<?php


/**
 * @file
 * Announcements feed helper functions.
 */

/**
 * Returns the list of announcements.
 *
 * @return array
 *   A build array with announcements.
 */
function announcements_feed_get_announcements() {
    drupal_set_title(t('Community announcements'));
    drupal_add_css(drupal_get_path('module', 'announcements_feed') . '/announcements_feed.css', array(
        'group' => CSS_DEFAULT,
        'every_page' => TRUE,
    ));
    try {
        $announcements = announcements_feed_get_all_announcements();
    } catch (Exception $e) {
        drupal_set_message(t('An error occurred while parsing the announcements feed, check the logs for more information.'), 'error');
        return array();
    }
    $build = array();
    foreach ($announcements as $announcement) {
        $key = $announcement['featured'] ? '#featured' : '#standard';
        $build[$key][] = $announcement;
    }
    $build = array_merge($build, array(
        '#theme' => 'announcements_feed',
        '#count' => count($announcements),
        '#feed_link' => variable_get('announcements_feed_link', ANNOUNCEMENTS_FEED_DEFAULT_LINK),
    ));
    return $build;
}

/**
 * Generate an array of announcements with keys.
 *
 * @return array
 *   An array of announcements.
 */
function announcements_feed_get_all_announcements() {
    $announcements = announcements_feed_fetch();
    $announcements_feed = array();
    foreach ($announcements as $announcement) {
        $announcements_feed[] = array(
            'id' => $announcement['id'],
            'title' => $announcement['title'],
            'link' => $announcement['url'],
            'date_modified' => $announcement['date_modified'],
            'date_published' => $announcement['date_published'],
            'teaser' => $announcement['content_html'],
            'version' => $announcement['_drupalorg']['version'],
            'featured' => (bool) $announcement['_drupalorg']['featured'],
        );
    }
    return $announcements_feed;
}

/**
 * Fetches the feed either from a local cache or fresh remotely.
 *
 * The feed follows the "JSON Feed" format:
 * - https://www.jsonfeed.org/version/1.1/
 *
 * The structure of an announcement item in the feed is:
 *   - id: Id.
 *   - title: Title of the announcement.
 *   - content_html: Announcement teaser.
 *   - url: URL
 *   - date_modified: Last updated timestamp.
 *   - date_published: Created timestamp.
 *   - _drupalorg.featured: 1 if featured, 0 if not featured.
 *   - _drupalorg.version: Target version of Drupal, as a Composer version.
 *
 * @param bool $force
 *   (optional) Whether to always fetch new items or not. Defaults to FALSE.
 *
 * @return array
 *   An array of announcements from the feed relevant to the Drupal version.
 *   The array is empty if there were no matching announcements. If an error
 *   occurred while fetching/decoding the feed, it is thrown as an exception.
 *
 * @throws Exception
 */
function announcements_feed_fetch($force = FALSE) {
    $announcements = cache_get('announcements_feed');
    if ($force || empty($announcements)) {
        $announcements_feed_json_url = variable_get('announcements_feed_json_url', ANNOUNCEMENTS_FEED_DEFAULT_JSON_URL);
        $response = drupal_http_request($announcements_feed_json_url);
        if ($response->code == 200) {
            $feeds = json_decode($response->data, TRUE);
            if (!isset($feeds['items'])) {
                watchdog('announcements_feed', 'The feed format is not valid.', NULL, WATCHDOG_ERROR);
                throw new Exception('Announcements feed JSON format is invalid');
            }
            $announcements = array();
            if ($feeds['items']) {
                $announcements = $feeds['items'];
            }
            $announcements = array_filter($announcements, 'announcements_feed_filter_announcements');
            cache_set('announcements_feed', $announcements, 'cache', REQUEST_TIME + variable_get('announcements_feed_max_age', ANNOUNCEMENTS_FEED_DEFAULT_MAX_AGE));
        }
        else {
            watchdog('announcements_feed', 'The feed failed to fetch with an error code: @code, error message: @message.', array(
                '@code' => $response->code,
                '@message' => $response->error,
            ), WATCHDOG_ERROR);
            throw new Exception($response->error, $response->code);
        }
    }
    else {
        $announcements = $announcements->data;
    }
    // The drupal.org endpoint is sorted by created date in descending order.
    // We will limit the announcements based on the configuration limit.
    $announcements_feed_limit = variable_get('announcements_feed_limit', ANNOUNCEMENTS_FEED_DEFAULT_LIMIT);
    $announcements = array_slice($announcements, 0, $announcements_feed_limit);
    // For the remaining announcements, put all the featured announcements
    // before the rest.
    uasort($announcements, 'announcements_feed_sort_featured');
    return $announcements;
}

/**
 * Sort the elements of announcements_feed by values in comparison function.
 */
function announcements_feed_sort_featured($a, $b) {
    $a_value = (int) $a['_drupalorg']['featured'];
    $b_value = (int) $b['_drupalorg']['featured'];
    if ($a_value == $b_value) {
        return 0;
    }
    return $a_value < $b_value ? -1 : 1;
}

/**
 * Filter the announcements relevant to the Drupal version used with valid URL controlled by drupal.org.
 *
 * @param array $announcement
 *   Announcement feed array item to check.
 *
 * @return bool
 *   Return TRUE if $announcement is relevant and the URL is valid.
 */
function announcements_feed_filter_announcements($announcement) {
    $announcement_url = '';
    $announcement_version = '';
    if (!empty($announcement['url'])) {
        $announcement_url = $announcement['url'];
    }
    if (!empty($announcement['_drupalorg']['version'])) {
        $announcement_version = $announcement['_drupalorg']['version'];
    }
    return announcements_feed_validate_url($announcement_url) && announcements_feed_is_relevant_item($announcement_version);
}

/**
 * Check whether the version given is relevant to the Drupal version used.
 *
 * @param string $version
 *   Version to check.
 *
 * @return bool
 *   Return TRUE if the version matches Drupal version.
 */
function announcements_feed_is_relevant_item($version) {
    if ($version == '*') {
        return TRUE;
    }
    // Split the version if received in || formats.
    $version_patterns = '/\\|\\|/';
    $all_versions = preg_split($version_patterns, $version);
    // The operation is optional and defaults to equals.
    $p_op = '(?P<operation>!=|\\^|==|=|<|<=|>|>=|<>)?';
    $operations = '=';
    // Extracts major version from version string like 7, 8, 9.
    $p_major = '(?P<major>\\d+)';
    // Extracts minor version from version string.
    $p_minor = '(?P<minor>(?:\\d+|x)(?:-[A-Za-z]+\\d+)?)';
    foreach ($all_versions as $version) {
        if (preg_match("/^\\s*{$p_op}\\s*{$p_major}(\\.{$p_minor})?/", $version, $matches)) {
            $feed_version = $matches['major'];
            if (!empty($matches['minor'])) {
                $feed_version = $matches['major'] . '.' . $matches['minor'];
            }
            if (!empty($matches['operation'])) {
                $operations = $matches['operation'];
                if ($operations == '^') {
                    $operations = '>=';
                }
            }
            if (isset($operations) && version_compare(VERSION, $feed_version, $operations)) {
                return TRUE;
            }
        }
    }
    return FALSE;
}

/**
 * Check whether a link is controlled by drupal.org.
 *
 * @param string $url
 *   URL to check.
 *
 * @return bool
 *   Return TRUE if the URL is controlled by drupal.org.
 */
function announcements_feed_validate_url($url) {
    if (empty($url)) {
        return FALSE;
    }
    $host = parse_url($url, PHP_URL_HOST);
    // First character can only be a letter or a digit.
    // @see https://www.rfc-editor.org/rfc/rfc1123#page-13
    return $host && preg_match('/^([a-zA-Z0-9][a-zA-Z0-9\\-_]*\\.)?drupal\\.org$/', $host);
}