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+<?php
+/**
+ * Laconica, the distributed open-source microblogging tool
+ *
+ * Action for showing Twitter-like Atom search results
+ *
+ * PHP version 5
+ *
+ * LICENCE: This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @category Search
+ * @package Laconica
+ * @author Zach Copley <zach@controlyourself.ca>
+ * @copyright 2008-2009 Control Yourself, Inc.
+ * @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
+ * @link http://laconi.ca/
+ */
+
+if (!defined('LACONICA')) {
+ exit(1);
+}
+
+require_once INSTALLDIR.'/lib/twitterapi.php';
+
+/**
+ * Action for outputting search results in Twitter compatible Atom
+ * format.
+ *
+ * TODO: abstract Atom stuff into a ruseable base class like
+ * RSS10Action.
+ *
+ * @category Search
+ * @package Laconica
+ * @author Zach Copley <zach@controlyourself.ca>
+ * @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
+ * @link http://laconi.ca/
+ *
+ * @see TwitterapiAction
+ */
+
+class TwitapisearchatomAction extends TwitterapiAction
+{
+
+ var $notices;
+ var $cnt;
+ var $query;
+ var $lang;
+ var $rpp;
+ var $page;
+ var $since_id;
+ var $geocode;
+
+ /**
+ * Constructor
+ *
+ * Just wraps the Action constructor.
+ *
+ * @param string $output URI to output to, default = stdout
+ * @param boolean $indent Whether to indent output, default true
+ *
+ * @see Action::__construct
+ */
+
+ function __construct($output='php://output', $indent=true)
+ {
+ parent::__construct($output, $indent);
+ }
+
+ /**
+ * Do we need to write to the database?
+ *
+ * @return boolean true
+ */
+
+ function isReadonly()
+ {
+ return true;
+ }
+
+ /**
+ * Read arguments and initialize members
+ *
+ * @param array $args Arguments from $_REQUEST
+ *
+ * @return boolean success
+ *
+ */
+
+ function prepare($args)
+ {
+ parent::prepare($args);
+
+ $this->query = $this->trimmed('q');
+ $this->lang = $this->trimmed('lang');
+ $this->rpp = $this->trimmed('rpp');
+
+ if (!$this->rpp) {
+ $this->rpp = 15;
+ }
+
+ if ($this->rpp > 100) {
+ $this->rpp = 100;
+ }
+
+ $this->page = $this->trimmed('page');
+
+ if (!$this->page) {
+ $this->page = 1;
+ }
+
+ // TODO: Suppport since_id -- we need to tweak the backend
+ // Search classes to support it.
+
+ $this->since_id = $this->trimmed('since_id');
+ $this->geocode = $this->trimmed('geocode');
+
+ // TODO: Also, language and geocode
+
+ return true;
+ }
+
+ /**
+ * Handle a request
+ *
+ * @param array $args Arguments from $_REQUEST
+ *
+ * @return void
+ */
+
+ function handle($args)
+ {
+ parent::handle($args);
+ $this->showAtom();
+ }
+
+ /**
+ * Get the notices to output as results. This also sets some class
+ * attrs so we can use them to calculate pagination, and output
+ * since_id and max_id.
+ *
+ * @return array an array of Notice objects sorted in reverse chron
+ */
+
+ function getNotices()
+ {
+ // TODO: Support search operators like from: and to:, boolean, etc.
+
+ $notice = new Notice();
+
+ // lcase it for comparison
+ $q = strtolower($this->query);
+
+ $search_engine = $notice->getSearchEngine('identica_notices');
+ $search_engine->set_sort_mode('chron');
+ $search_engine->limit(($this->page - 1) * $this->rpp,
+ $this->rpp + 1, true);
+ $search_engine->query($q);
+ $this->cnt = $notice->find();
+
+ $cnt = 0;
+
+ while ($notice->fetch()) {
+
+ ++$cnt;
+
+ if (!$this->max_id) {
+ $this->max_id = $notice->id;
+ }
+
+ if ($cnt > $this->rpp) {
+ break;
+ }
+
+ $notices[] = clone($notice);
+ }
+
+ return $notices;
+ }
+
+ /**
+ * Output search results as an Atom feed
+ *
+ * @return void
+ */
+
+ function showAtom()
+ {
+ $notices = $this->getNotices();
+
+ $this->initAtom();
+ $this->showFeed();
+
+ foreach ($notices as $n) {
+ $this->showEntry($n);
+ }
+
+ $this->endAtom();
+ }
+
+ /**
+ * Show feed specific Atom elements
+ *
+ * @return void
+ */
+
+ function showFeed()
+ {
+ // TODO: A9 OpenSearch stuff like search.twitter.com?
+
+ $lang = common_config('site', 'language');
+ $server = common_config('site', 'server');
+ $sitename = common_config('site', 'name');
+
+ // XXX: Use xmlns:laconica instead?
+
+ $this->elementStart('feed',
+ array('xmlns' => 'http://www.w3.org/2005/Atom',
+ 'xmlns:twitter' => 'http://api.twitter.com/',
+ 'xml:lang' => $lang));
+
+ $year = date('Y');
+ $this->element('id', null, "tag:$server,$year:search/$server");
+
+ $site_uri = common_path(false);
+
+ $search_uri = $site_uri . 'api/search.atom?q=' . urlencode($this->query);
+
+ if ($this->rpp != 15) {
+ $search_uri .= '&rpp=' . $this->rpp;
+ }
+
+ // FIXME: this alternate link is not quite right because our
+ // web-based notice search doesn't support a rpp (responses per
+ // page) param yet
+
+ $this->element('link', array('type' => 'text/html',
+ 'rel' => 'alternate',
+ 'href' => $site_uri . 'search/notice?q=' .
+ urlencode($this->query)));
+
+ // self link
+
+ $self_uri = $search_uri . '&page=' . $this->page;
+
+ $this->element('link', array('type' => 'application/atom+xml',
+ 'rel' => 'self',
+ 'href' => $self_uri));
+
+ $this->element('title', null, "$this->query - $sitename Search");
+
+ // refresh link
+
+ $refresh_uri = $search_uri . "&since_id=" . $this->max_id;
+
+ $this->element('link', array('type' => 'application/atom+xml',
+ 'rel' => 'refresh',
+ 'href' => $refresh_uri));
+
+ // pagination links
+
+ if ($this->cnt > $this->rpp) {
+
+ $next_uri = $search_uri . "&max_id=" . $this->max_id .
+ '&page=' . ($this->page + 1);
+
+ $this->element('link', array('type' => 'application/atom+xml',
+ 'rel' => 'next',
+ 'href' => $next_uri));
+ }
+
+ if ($this->page > 1) {
+
+ $previous_uri = $search_uri . "&max_id=" . $this->max_id .
+ '&page=' . ($this->page - 1);
+
+ $this->element('link', array('type' => 'application/atom+xml',
+ 'rel' => 'previous',
+ 'href' => $previous_uri));
+ }
+
+ }
+
+ /**
+ * Build an Atom entry similar to search.twitter.com's based on
+ * a given notice
+ *
+ * @param Notice $notice the notice to use
+ *
+ * @return void
+ */
+
+ function showEntry($notice)
+ {
+ $server = common_config('site', 'server');
+ $profile = $notice->getProfile();
+ $nurl = common_local_url('shownotice', array('notice' => $notice->id));
+
+ $this->elementStart('entry');
+
+ $year = date('Y', strtotime($notice->created));
+
+ $this->element('id', null, "tag:$server,$year:$notice->id");
+ $this->element('published', null, common_date_w3dtf($notice->created));
+ $this->element('link', array('type' => 'text/html',
+ 'rel' => 'alternate',
+ 'href' => $nurl));
+ $this->element('title', null, common_xml_safe_str(trim($notice->content)));
+ $this->element('content', array('type' => 'text/html'), $notice->rendered);
+ $this->element('updated', null, common_date_w3dtf($notice->created));
+ $this->element('link', array('type' => 'image/png',
+ 'rel' => 'image',
+ 'href' => $profile->avatarUrl()));
+
+ // TODO: Here is where we'd put in a link to an atom feed for threads
+
+ $this->element("twitter:source", null,
+ htmlentities($this->source_link($notice->source)));
+
+ $this->elementStart('author');
+
+ $name = $profile->nickname;
+
+ if ($profile->fullname) {
+ $name .= ' (' . $profile->fullname . ')';
+ }
+
+ $this->element('name', null, $name);
+ $this->element('uri', null, common_profile_uri($profile));
+ $this->elementEnd('author');
+
+ $this->elementEnd('entry');
+ }
+
+ /**
+ * Initialize the Atom output, send headers
+ *
+ * @return void
+ */
+
+ function initAtom()
+ {
+ header('Content-Type: application/atom+xml; charset=utf-8');
+ $this->startXml();
+ }
+
+ /**
+ * End the Atom feed
+ *
+ * @return void
+ */
+
+ function endAtom()
+ {
+ $this->elementEnd('feed');
+ }
+
+}
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