forked from GNUsocial/gnu-social
378 lines
10 KiB
PHP
378 lines
10 KiB
PHP
<?php
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/**
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* Laconica, the distributed open-source microblogging tool
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*
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* Action for showing Twitter-like Atom search results
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*
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* PHP version 5
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*
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* LICENCE: This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* @category Search
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* @package Laconica
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* @author Zach Copley <zach@controlyourself.ca>
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* @copyright 2008-2009 Control Yourself, Inc.
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
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* @link http://laconi.ca/
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*/
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if (!defined('LACONICA')) {
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exit(1);
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}
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require_once INSTALLDIR.'/lib/twitterapi.php';
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/**
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* Action for outputting search results in Twitter compatible Atom
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* format.
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*
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* TODO: abstract Atom stuff into a ruseable base class like
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* RSS10Action.
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*
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* @category Search
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* @package Laconica
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* @author Zach Copley <zach@controlyourself.ca>
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
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* @link http://laconi.ca/
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*
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* @see TwitterapiAction
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*/
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class TwitapisearchatomAction extends TwitterapiAction
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{
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var $cnt;
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var $query;
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var $lang;
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var $rpp;
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var $page;
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var $since_id;
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var $geocode;
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/**
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* Constructor
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*
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* Just wraps the Action constructor.
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*
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* @param string $output URI to output to, default = stdout
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* @param boolean $indent Whether to indent output, default true
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*
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* @see Action::__construct
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*/
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function __construct($output='php://output', $indent=true)
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{
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parent::__construct($output, $indent);
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}
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/**
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* Do we need to write to the database?
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*
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* @return boolean true
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*/
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function isReadonly()
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{
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return true;
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}
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/**
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* Read arguments and initialize members
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*
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* @param array $args Arguments from $_REQUEST
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*
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* @return boolean success
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*
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*/
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function prepare($args)
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{
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parent::prepare($args);
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$this->query = $this->trimmed('q');
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$this->lang = $this->trimmed('lang');
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$this->rpp = $this->trimmed('rpp');
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if (!$this->rpp) {
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$this->rpp = 15;
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}
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if ($this->rpp > 100) {
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$this->rpp = 100;
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}
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$this->page = $this->trimmed('page');
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if (!$this->page) {
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$this->page = 1;
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}
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// TODO: Suppport since_id -- we need to tweak the backend
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// Search classes to support it.
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$this->since_id = $this->trimmed('since_id');
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$this->geocode = $this->trimmed('geocode');
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// TODO: Also, language and geocode
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return true;
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}
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/**
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* Handle a request
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*
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* @param array $args Arguments from $_REQUEST
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*
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* @return void
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*/
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function handle($args)
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{
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parent::handle($args);
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$this->showAtom();
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}
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/**
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* Get the notices to output as results. This also sets some class
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* attrs so we can use them to calculate pagination, and output
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* since_id and max_id.
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*
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* @return array an array of Notice objects sorted in reverse chron
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*/
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function getNotices()
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{
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// TODO: Support search operators like from: and to:, boolean, etc.
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$notices = array();
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$notice = new Notice();
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// lcase it for comparison
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$q = strtolower($this->query);
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$search_engine = $notice->getSearchEngine('identica_notices');
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$search_engine->set_sort_mode('chron');
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$search_engine->limit(($this->page - 1) * $this->rpp,
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$this->rpp + 1, true);
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$search_engine->query($q);
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$this->cnt = $notice->find();
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$cnt = 0;
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while ($notice->fetch()) {
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++$cnt;
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if (!$this->max_id) {
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$this->max_id = $notice->id;
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}
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if ($cnt > $this->rpp) {
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break;
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}
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$notices[] = clone($notice);
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}
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return $notices;
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}
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/**
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* Output search results as an Atom feed
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*
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* @return void
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*/
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function showAtom()
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{
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$notices = $this->getNotices();
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$this->initAtom();
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$this->showFeed();
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foreach ($notices as $n) {
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$this->showEntry($n);
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}
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$this->endAtom();
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}
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/**
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* Show feed specific Atom elements
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*
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* @return void
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*/
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function showFeed()
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{
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// TODO: A9 OpenSearch stuff like search.twitter.com?
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$server = common_config('site', 'server');
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$sitename = common_config('site', 'name');
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// XXX: Use xmlns:laconica instead?
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$this->elementStart('feed',
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array('xmlns' => 'http://www.w3.org/2005/Atom',
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// XXX: xmlns:twitter causes Atom validation to fail
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// It's used for the source attr on notices
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'xmlns:twitter' => 'http://api.twitter.com/',
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'xml:lang' => 'en-US')); // XXX Other locales ?
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$taguribase = common_config('integration', 'taguri');
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$this->element('id', null, "tag:$taguribase:search/$server");
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$site_uri = common_path(false);
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$search_uri = $site_uri . 'api/search.atom?q=' . urlencode($this->query);
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if ($this->rpp != 15) {
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$search_uri .= '&rpp=' . $this->rpp;
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}
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// FIXME: this alternate link is not quite right because our
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// web-based notice search doesn't support a rpp (responses per
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// page) param yet
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$this->element('link', array('type' => 'text/html',
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'rel' => 'alternate',
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'href' => $site_uri . 'search/notice?q=' .
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urlencode($this->query)));
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// self link
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$self_uri = $search_uri;
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$self_uri .= ($this->page > 1) ? '&page=' . $this->page : '';
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$this->element('link', array('type' => 'application/atom+xml',
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'rel' => 'self',
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'href' => $self_uri));
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$this->element('title', null, "$this->query - $sitename Search");
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$this->element('updated', null, common_date_iso8601('now'));
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// XXX: The below "rel" links are not valid Atom, but it's what
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// Twitter does...
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// refresh link
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$refresh_uri = $search_uri . "&since_id=" . $this->max_id;
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$this->element('link', array('type' => 'application/atom+xml',
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'rel' => 'refresh',
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'href' => $refresh_uri));
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// pagination links
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if ($this->cnt > $this->rpp) {
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$next_uri = $search_uri . "&max_id=" . $this->max_id .
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'&page=' . ($this->page + 1);
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$this->element('link', array('type' => 'application/atom+xml',
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'rel' => 'next',
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'href' => $next_uri));
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}
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if ($this->page > 1) {
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$previous_uri = $search_uri . "&max_id=" . $this->max_id .
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'&page=' . ($this->page - 1);
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$this->element('link', array('type' => 'application/atom+xml',
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'rel' => 'previous',
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'href' => $previous_uri));
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}
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}
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/**
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* Build an Atom entry similar to search.twitter.com's based on
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* a given notice
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*
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* @param Notice $notice the notice to use
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*
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* @return void
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*/
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function showEntry($notice)
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{
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$server = common_config('site', 'server');
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$profile = $notice->getProfile();
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$nurl = common_local_url('shownotice', array('notice' => $notice->id));
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$this->elementStart('entry');
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$taguribase = common_config('integration', 'taguri');
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$this->element('id', null, "tag:$taguribase:$notice->id");
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$this->element('published', null, common_date_w3dtf($notice->created));
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$this->element('link', array('type' => 'text/html',
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'rel' => 'alternate',
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'href' => $nurl));
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$this->element('title', null, common_xml_safe_str(trim($notice->content)));
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$this->element('content', array('type' => 'html'), $notice->rendered);
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$this->element('updated', null, common_date_w3dtf($notice->created));
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$this->element('link', array('type' => 'image/png',
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// XXX: Twitter uses rel="image" (not valid)
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'rel' => 'related',
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'href' => $profile->avatarUrl()));
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// TODO: Here is where we'd put in a link to an atom feed for threads
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$this->element("twitter:source", null,
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htmlentities($this->source_link($notice->source)));
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$this->elementStart('author');
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$name = $profile->nickname;
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if ($profile->fullname) {
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$name .= ' (' . $profile->fullname . ')';
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}
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$this->element('name', null, $name);
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$this->element('uri', null, common_profile_uri($profile));
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$this->elementEnd('author');
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$this->elementEnd('entry');
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}
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/**
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* Initialize the Atom output, send headers
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*
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* @return void
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*/
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function initAtom()
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{
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header('Content-Type: application/atom+xml; charset=utf-8');
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$this->startXml();
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}
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/**
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* End the Atom feed
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*
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* @return void
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*/
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function endAtom()
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{
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$this->elementEnd('feed');
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}
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}
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