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<?php
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// $Id: feed_node.module,v 1.2 2006/12/18 23:47:07 dayre Exp $
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/**
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* The purpose of this module is to provide a method for displaying aggregator feed items
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* within a node body. One can "feed enable" a particular node type which allows
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* the user to attach a feed to a node (title and URL). Once a feed is attached, a new feed
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* is created within the aggregator module and will be updated according to the update rules
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* specified within aggregator.
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*
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* When a feed detail (either title or url) is changed in the node edit form, the
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* corresponding feed details for the aggregator feed will be updated as well.
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*/
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// Currently, the feedfield project also uses the same aggregation_api.inc file
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// which we need to check if already included. feed_node and feedfield are
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// working towards adding more stability and functionality to the api for
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// wider usage with other aggregator related modules.
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if (!function_exists('aggregation_sync_feed')) {
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include('aggregation_api.inc');
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}
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/**
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* Help hook for feed_node.
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*/
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function feed_node_help($section) {
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switch ($section) {
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case 'admin/modules#description':
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$output = t('The feed node module enables a node to have an aggregator feed associated with it.');
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break;
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case "admin/settings/feed_node":
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$output = '<p>' . t('The feed node module allows you to associate an aggregator feed with a particular node so that aggregator feed items can be displayed within the node body.') . '</p>';
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break;
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}
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return $output;
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}
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/**
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* Implementation of hook_menu().
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*/
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function feed_node_menu($may_cache) {
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$items = array();
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$items[] = array('path' => 'admin/settings/feed_node', 'title' => t('feed node'),
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'callback' => 'feed_node_settings',
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'access' => user_access('administer feed node'));
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return $items;
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}
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/**
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* Implementation of hook_perm().
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*/
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function feed_node_perm() {
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return array('administer feed nodes');
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}
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function _feed_node_aggregator_dependency_check() {
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if (!module_exist("aggregator")) {
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drupal_set_message(t("You do not have the aggregator module installed. Please ensure this is enabled or feed node will not work."), "error");
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}
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}
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/**
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* Feed node implementation of the administrative settings hook.
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*/
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function feed_node_settings() {
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_feed_node_aggregator_dependency_check();
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$form = array();
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$form['feed_node_allowed_html_tags'] = array(
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'#type' => 'textfield',
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'#title' => t('Allowed HTML tags'),
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'#size' => 80,
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'#maxlength' => 255,
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'#default_value' => variable_get("feed_node_allowed_html_tags", '<blockquote> <strong> <cite> <code> <ul> <ol> <li> <dl> <dt> <dd>'),
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'#description' => t('The list of tags which are allowed in feed items, i.e., which will not be stripped out.')
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);
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$form['feed_node_teaser_length'] = array(
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'#type' => 'textfield',
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'#title' => t('Teaser length'),
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'#size' => 10,
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'#maxlength' => 5,
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'#default_value' => variable_get('feed_node_teaser_length', 200),
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'#description' => t('The maximum length for feed items. Feed items longer than this will be truncated.')
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);
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$form['feed_node_delete_flag'] = array(
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'#type' => 'checkbox',
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'#title' => t('Delete aggregator feed on node delete'),
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'#default_value' => variable_get('feed_node_delete_flag', 1),
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'#description' => t('Each feed enabled node is associated with a corresponding aggregator feed. If this is checked, then when the node is deleted, the corresponding aggregator feed is also deleted.')
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);
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// we could just to a standard 4.7 forms API returning of the $form variable,
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// but the only way to get a admin/settings menu title that says "feed node" instead
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// of "feed_node" is to specify a custom menu callback hook to this settings method, where
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// we now have to do some more traditional form stuff... like create a corresponding
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// submit method
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$form['submit'] = array('#type' => 'submit', '#value' => t('Save configuration'));
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$form['clear'] = array('#type' => 'submit', '#value' => t('Reset to defaults'));
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return drupal_get_form('feed_node_settings', $form);
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}
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function feed_node_settings_submit($form_id, $values) {
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$op = isset($_POST['op']) ? $_POST['op'] : '';
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$key = $values['var'];
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// Exclude unnecessary elements.
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unset($values['submit'], $values['reset'], $values['form_id']);
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if ($op == t('Reset to defaults')) {
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variable_del("feed_node_allowed_html_tags");
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variable_del("feed_node_delete_flag");
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variable_del("feed_node_teaser_length");
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drupal_set_message(t('The configuration options have been reset to their default values.'));
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}
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else {
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variable_set("feed_node_allowed_html_tags", $values['feed_node_allowed_html_tags']);
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variable_set("feed_node_delete_flag", $values['feed_node_delete_flag']);
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variable_set("feed_node_teaser_length", $values['feed_node_teaser_length']);
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drupal_set_message(t('The configuration options have been saved.'));
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}
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}
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/**
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* Validates feed information specified in the feed node section of a node edit form. This method
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* checks that all the mandatory aggregator feed information is present.
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*
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* @param $form
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*/
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function _feed_node_validate($form) {
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// if only one of feedtitle or feedurl exist, error
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// if both exist, then numitems must exist
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if (trim($form->feed_node['aggregator_feed']['title'])
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&& !trim($form->feed_node['aggregator_feed']['url'])) {
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form_set_error('feed_node][aggregator_feed][url', t('If you specify a feed title, you must also specify a feed URL.'));
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}
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if (!trim($form->feed_node['aggregator_feed']['title'])
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&& trim($form->feed_node['aggregator_feed']['url'])) {
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form_set_error('feed_node][aggregator_feed][title', t('If you specify a feed URL, you must also specify a feed title.'));
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}
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if (trim($form->feed_node['aggregator_feed']['title'])
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&& trim($form->feed_node['aggregator_feed']['url']) && !trim($form->feed_node['numItems'])) {
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form_set_error('feed_node][numItems', t('If you specify a feed, you must also specify how many feed items to list.'));
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}
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// check to see that we don't have a conflict with an existing feed
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// in the database
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$urlfeed = aggregation_get_feed_by_url($form->feed_node['aggregator_feed']['url']);
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$titlefeed = aggregation_get_feed_by_title($form->feed_node['aggregator_feed']['title']);
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if ($urlfeed && $titlefeed && $urlfeed['fid'] != $titlefeed['fid']) {
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form_set_error('feed_node][aggregator_feed][url', t('Feed conflict. One feed already exists with the specified URL while a different feed exists with the specified title. Change one or the other.'));
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form_set_error('feed_node][aggregator_feed][title', t('Feed conflict. One feed already exists with the specified URL while a different feed exists with the specified title. Change one or the other.'));
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}
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}
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/**
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* Node API workflow hooks for insert, load, update and delete.
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*
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* @param $node
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* @param $op
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*/
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function feed_node_nodeapi(&$node, $op) {
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switch ($op) {
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case 'validate':
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_feed_node_validate($node);
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break;
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// load the extended node attributes
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case 'load':
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// fetch the feed node
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$feed_node = db_fetch_array(db_query('SELECT * FROM {feed_node} WHERE nid = %d', $node->nid));
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// if no feed attached to the node, nothing to do...
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if ($feed_node) {
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// fetch the aggregator feed
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$aggregator_feed = aggregation_get_feed_by_id($feed_node['fid']);
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// fetch the aggregator items for the feed
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$result = db_query('SELECT * FROM {aggregator_item} WHERE fid = %d ORDER BY timestamp DESC, iid DESC LIMIT %d', $feed_node['fid'], $feed_node['numItems']);
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while ($data = db_fetch_array($result)) {
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$aggregator_items[] = $data;
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}
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// tack on the feed and feed items
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$feed_node['aggregator_feed'] = $aggregator_feed;
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$feed_node['aggregator_items'] = $aggregator_items;
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// return the additional node attributes
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return array('feed_node' => $feed_node);
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}
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break;
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// insert the extended feed node attributes, only if we a feed title or feed url
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case 'insert':
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case 'update':
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if ($op == "update") {
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// do a fresh insert
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db_query('DELETE FROM {feed_node} WHERE nid = %d', $node->nid);
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}
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// if we have a feed, ensure it is synced with the aggregator feed. Syncing ensures that
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// the feed exists in the aggregator table. If it doesn't, a new entry is created. If the
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// title or URL matches an existing entry, then the call to aggregation_sync_feed() ensures that
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// the aggregator feed item is updated so that the title and URL specified are updated for that
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// feed.
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if (trim($node->feed_node['aggregator_feed']['title']) && trim($node->feed_node['aggregator_feed']['url'])) {
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$fid = aggregation_sync_feed($node->feed_node['aggregator_feed']['title'], $node->feed_node['aggregator_feed']['url']);
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if ($fid != -1) {
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db_query('INSERT INTO {feed_node} (nid, fid, numItems, displayStyle) VALUES (%d, %d, %d, %d)', $node->nid, $fid, $node->feed_node['numItems'], $node->feed_node['displayStyle']);
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}
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else {
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}
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}
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break;
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// delete the extended feed node attributes
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case 'delete':
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db_query('DELETE FROM {feed_node} WHERE nid = %d', $node->nid);
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// if this node has an associated feed and the delete flag is set,
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// delete the feed and feed items
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if (aggregation_get_feed_by_id($node->feed_node['fid']) && variable_get('feed_node_delete_flag', 1)) {
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aggregation_delete_feed($node->feed_node['fid']);
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}
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break;
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case 'view':
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// if we have an attached feed, display it in the body of the node
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if ($node->feed_node) {
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$node->body = $node->body . theme('feed_node', $node->feed_node);
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}
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break;
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}
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}
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/**
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* Hook to alter the node edit form so we can allow the user to specify feed information and
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* configuration info.
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*
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* @param $form_id
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* @param $form
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*
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*/
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function feed_node_form_alter($form_id, &$form) {
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// We're only modifying node forms, if the type field isn't set we don't need
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// to bother.
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if (!isset($form['type'])) {
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return;
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}
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$type = $form['type']['#value'];
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// The feeds are enabled on a per node type basis. The variable used to store
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// this information is named using both the name of this module, to
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// avoid namespace conflicts, and the node, because we support multiple node
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// types.
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$enabled = variable_get('feed_node_'. $type, 0);
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switch ($form_id) {
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// Settings form allowing node types to have display aggregator feed items output.
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case $type .'_node_settings':
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$form['workflow']['feed_node_'. $type] = array(
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'#type' => 'radios',
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'#title' => t('Feed node capability'),
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'#default_value' => $enabled,
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'#options' => array(0 => t('Disabled'), 1 => t('Enabled')),
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'#description' => t('Can this node type have an aggregator feed attached to it ?'),
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);
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break;
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case $type .'_node_form':
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// If the feed is enabled for this node type, we insert our control
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// into the form.
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if ($enabled) {
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// if we have a feed, body isn't mandatory, we override the
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// default of a mandatory body.
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$form['body_filter']['body']['#required'] = 0;
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$form['feed_node'] = array(
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'#type' => 'fieldset',
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'#title' => t('Feed information'),
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'#collapsible' => TRUE,
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'#collapsed' => TRUE,
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'#tree' => TRUE,
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'#weight' => 1
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);
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// fetch feed data to populate title and url form elements
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$feed = aggregation_get_feed_by_id($form['#node']->feed_node['fid']);
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$form['feed_node']['aggregator_feed']['title'] = array(
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'#type' => 'textfield',
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'#title' => t('Title of feed'),
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'#default_value' => $feed['title'],
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'#required' => FALSE,
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'#maxlength' => 255,
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'#tree' => TRUE,
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'#weight' => 0,
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);
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$form['feed_node']['aggregator_feed']['url'] = array(
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'#type' => 'textfield',
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'#title' => t('Feed URL'),
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'#default_value' => $feed['url'],
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'#required' => FALSE,
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'#maxlength' => 255,
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'#weight' => 0,
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);
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$numItems = $form['#node']->feed_node['numItems'];
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$form['feed_node']['numItems'] = array(
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'#type' => 'textfield',
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'#title' => t('Number of feed items to display'),
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'#default_value' => $numItems ? $numItems : 10 ,
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'#required' => FALSE,
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'#maxlength' => 10,
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'#weight' => 1,
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);
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$form['feed_node']['displayStyle'] = array(
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'#type' => 'radios',
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'#title' => t('Display style'),
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'#default_value' => $form['#node']->feed_node['displayStyle'],
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'#options' => array(t('Title + Teaser'), t('Title only')),
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);
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} // endif
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break;
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| 346 |
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| 347 |
} // end switch
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| 348 |
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| 349 |
}
|
| 350 |
|
| 351 |
|
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/**
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| 353 |
* Given an aggregator item result set, returns an array of arrays
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* containing aggregator item records with duplicate entries removed.
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| 355 |
* This method is used to help cleanup the insertion of duplicate
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| 356 |
* aggregator items into the aggregator_item table by the aggregator
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* cron updates. Duplicate item entry is only seen when the number
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| 358 |
* of aggregator feeds are in the hundreds and is caused by overlapping
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* cron job updates inserting the same feed items multiple times.
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| 360 |
* Duplicates are determined using a combinaton of item timestamp and
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* an MD5 hash of the item description field.
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| 362 |
*
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| 363 |
* @param $result
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| 364 |
* A database result set of aggregator_item rows containing at least the timestamp and description fields
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| 365 |
* @return
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| 366 |
* An array of aggregator_item row data with duplicates items removed.
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| 367 |
*/
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| 368 |
function _feed_node_fetch_unique_feed_items($result) {
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| 369 |
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| 370 |
$item_tracker = array();
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| 371 |
if (db_num_rows($result)) {
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| 372 |
while ($item = db_fetch_array($result)) {
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| 373 |
if ($item_tracker[$item['timestamp']] != md5($item['description'])) {
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| 374 |
$item_tracker[$item['timestamp']] = md5($item['description']);
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| 375 |
$items[] = $item;
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| 376 |
}
|
| 377 |
}
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| 378 |
}
|
| 379 |
return $items;
|
| 380 |
}
|
| 381 |
|
| 382 |
/**
|
| 383 |
* Displays the specified number of feed items for the feed with the specified feed id.
|
| 384 |
*
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| 385 |
* @param $feed_node
|
| 386 |
* @return
|
| 387 |
*/
|
| 388 |
function theme_feed_node($feed_node) {
|
| 389 |
|
| 390 |
$output = '<div class="feed_node">';
|
| 391 |
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| 392 |
// output feed title and meta data
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| 393 |
$feed = $feed_node['aggregator_feed'];
|
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$output .= '<h3>'. t($feed['title']) .'</h3>';
|
| 395 |
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| 396 |
if ($feed['link']) {
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$output .= '<div class="feed-url"><em>'. t('URL:') .'</em> '. l($feed['link'], $feed['link'], array(), NULL, NULL, TRUE) ."</div>\n";
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}
|
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| 400 |
if ($feed['checked']) {
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| 401 |
$updated = t('%time ago', array('%time' => format_interval(time() - $feed['checked'])));
|
| 402 |
}
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| 403 |
else {
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| 404 |
$updated = t('never');
|
| 405 |
}
|
| 406 |
|
| 407 |
if (user_access('administer news feeds')) {
|
| 408 |
$updated = l($updated, 'admin/aggregator');
|
| 409 |
}
|
| 410 |
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| 411 |
$output .= '<div class="feed-updated"><em>'. t('Updated:') . "</em> $updated</div>";
|
| 412 |
|
| 413 |
// output individual feed items
|
| 414 |
$aggregator_items = $feed_node['aggregator_items'];
|
| 415 |
if ($aggregator_items) {
|
| 416 |
foreach ($aggregator_items as $aggregator_item) {
|
| 417 |
$item_outputs[] = $feed_node['displayStyle']
|
| 418 |
? theme('feed_node_item_summary', $aggregator_item)
|
| 419 |
: theme('feed_node_item', $aggregator_item);
|
| 420 |
}
|
| 421 |
}
|
| 422 |
else {
|
| 423 |
$item_outputs[] = t("No feed items available.");
|
| 424 |
}
|
| 425 |
|
| 426 |
// if title only, theme as a list, else concatenate item outputs.
|
| 427 |
$output .= $feed_node['displayStyle'] ? theme('item_list', $item_outputs) : implode("\n", $item_outputs);
|
| 428 |
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| 429 |
$output .= '</div>';
|
| 430 |
|
| 431 |
return $output;
|
| 432 |
}
|
| 433 |
|
| 434 |
/**
|
| 435 |
* Returns a themed summary display for an individual aggregator feed item.
|
| 436 |
*
|
| 437 |
* @param $item
|
| 438 |
* The item array from the aggregator module.
|
| 439 |
* @return
|
| 440 |
* A string containing the HTML fragment.
|
| 441 |
*/
|
| 442 |
function theme_feed_node_item_summary($item) {
|
| 443 |
$output = '<a href="' .
|
| 444 |
check_url($item['link']) .'">' .
|
| 445 |
check_plain($item['title']) .
|
| 446 |
'</a> <span class="age">'.
|
| 447 |
t('%age old', array('%age' => format_interval(time() - $item['timestamp']))) .'</span>';
|
| 448 |
return $output ."\n";
|
| 449 |
}
|
| 450 |
|
| 451 |
|
| 452 |
/**
|
| 453 |
* Returns a themed detail display for an individual aggregator feed item.
|
| 454 |
*
|
| 455 |
* @param $item
|
| 456 |
* The item array from the aggregator module.
|
| 457 |
* @return
|
| 458 |
* A string containing the HTML fragment.
|
| 459 |
*/
|
| 460 |
function theme_feed_node_item($item) {
|
| 461 |
|
| 462 |
if (date('Ymd', $item['timestamp']) == date('Ymd')) {
|
| 463 |
$source_date = t('%ago ago', array('%ago' => format_interval(time() - $item['timestamp'])));
|
| 464 |
}
|
| 465 |
else {
|
| 466 |
$source_date = format_date($item['timestamp'], 'custom', variable_get('date_format_medium', 'D, Y-m-d H:i'));
|
| 467 |
}
|
| 468 |
|
| 469 |
$output .= "<div class=\"feed_node_item\">\n";
|
| 470 |
$output .= '<h3 class="item_title"><a href="'. check_url($item['link']) .'">'. check_plain($item['title']) ."</a></h3>\n";
|
| 471 |
$output .= "<div class=\"item_meta\"><span class=\"item_date\">$source_date</span></div>\n";
|
| 472 |
|
| 473 |
if ($item['description']) {
|
| 474 |
$output .= '<div class="item_description">'. _feed_node_truncate($item['description']) ."</div>\n";
|
| 475 |
}
|
| 476 |
|
| 477 |
// if the feed item belongs to categories, list them.
|
| 478 |
$result = db_query('SELECT c.title, c.cid FROM {aggregator_category_item} ci LEFT JOIN {aggregator_category} c ON ci.cid = c.cid WHERE ci.iid = %d ORDER BY c.title', $item['iid']);
|
| 479 |
$categories = array();
|
| 480 |
while ($category = db_fetch_object($result)) {
|
| 481 |
$categories[] = l($category->title, 'aggregator/categories/'. $category->cid);
|
| 482 |
}
|
| 483 |
if ($categories) {
|
| 484 |
$output .= '<div class="item_categories">'. t('Categories') .': '. implode(', ', $categories) ."</div>\n";
|
| 485 |
}
|
| 486 |
|
| 487 |
$output .= "</div>\n";
|
| 488 |
|
| 489 |
return $output;
|
| 490 |
}
|
| 491 |
|
| 492 |
|
| 493 |
/**
|
| 494 |
* Truncate function to mimic feedburner style feed content summarization. It uses the
|
| 495 |
* filter_xss() method to filter out any external references, then truncates the text
|
| 496 |
* to the specified length.
|
| 497 |
*
|
| 498 |
* @param $html
|
| 499 |
* The HTML fragment to summarize
|
| 500 |
* @param $length
|
| 501 |
* The maximum length the truncated fragment should be.
|
| 502 |
* @return
|
| 503 |
* The truncated HTMl fragment.
|
| 504 |
*/
|
| 505 |
function _feed_node_truncate($html, $length = 200) {
|
| 506 |
|
| 507 |
// similar to feedburner summarize feature, strips out links, then truncates to approximate
|
| 508 |
// length.
|
| 509 |
$html = filter_xss($html, preg_split('/\s+|<|>/', variable_get("feed_node_allowed_html_tags", '<blockquote> <strong> <cite> <code> <ul> <ol> <li> <dl> <dt> <dd>'), -1, PREG_SPLIT_NO_EMPTY));
|
| 510 |
|
| 511 |
// zip in $length chars, then skip to the next word boundary
|
| 512 |
if (preg_match("/(.{" . $length . "})(.*?)\W/", $html, $m)) {
|
| 513 |
$html = $m[1] . $m[2] . "...";
|
| 514 |
}
|
| 515 |
|
| 516 |
// if still over the length due to extremely long word, chop it
|
| 517 |
if (strlen($html) > $length) {
|
| 518 |
$html = substr($html, 0, $length) . "...";
|
| 519 |
}
|
| 520 |
|
| 521 |
return $html;
|
| 522 |
}
|
| 523 |
|
| 524 |
|
| 525 |
?>
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