friendica/mod/tagger.php

<?php
/**
 * @copyright Copyright (C) 2020, Friendica
 *
 * @license GNU AGPL version 3 or any later version
 *
 * 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 <https://www.gnu.org/licenses/>.
 *
 */

use Friendica\App;
use Friendica\Core\Hook;
use Friendica\Core\Logger;
use Friendica\Core\Session;
use Friendica\Core\System;
use Friendica\Core\Worker;
use Friendica\Database\DBA;
use Friendica\DI;
use Friendica\Model\Item;
use Friendica\Protocol\Activity;
use Friendica\Util\Strings;
use Friendica\Util\XML;
use Friendica\Worker\Delivery;

function tagger_content(App $a) {

	if (!Session::isAuthenticated()) {
		return;
	}

	$term = Strings::escapeTags(trim($_GET['term']));
	// no commas allowed
	$term = str_replace([',',' '],['','_'],$term);

	if (!$term) {
		return;
	}

	$item_id = (($a->argc > 1) ? Strings::escapeTags(trim($a->argv[1])) : 0);

	Logger::log('tagger: tag ' . $term . ' item ' . $item_id);


	$item = Item::selectFirst([], ['id' => $item_id]);

	if (!$item_id || !DBA::isResult($item)) {
		Logger::log('tagger: no item ' . $item_id);
		return;
	}

	$owner_uid = $item['uid'];
	$blocktags = 0;

	$r = q("select `blocktags` from user where uid = %d limit 1",
		intval($owner_uid)
	);
	if (DBA::isResult($r)) {
		$blocktags = $r[0]['blocktags'];
	}

	if (local_user() != $owner_uid) {
		return;
	}

	$r = q("select * from contact where self = 1 and uid = %d limit 1",
		intval(local_user())
	);
	if (DBA::isResult($r)) {
			$contact = $r[0];
	} else {
		Logger::log('tagger: no contact_id');
		return;
	}

	$uri = Item::newURI($owner_uid);
	$xterm = XML::escape($term);
	$post_type = (($item['resource-id']) ? DI::l10n()->t('photo') : DI::l10n()->t('status'));
	$targettype = (($item['resource-id']) ? Activity\ObjectType::IMAGE : Activity\ObjectType::NOTE );
	$href = DI::baseUrl() . '/display/' . $item['guid'];

	$link = XML::escape('<link rel="alternate" type="text/html" href="'. $href . '" />' . "\n");

	$body = XML::escape($item['body']);

	$target = <<< EOT
	<target>
		<type>$targettype</type>
		<local>1</local>
		<id>{$item['uri']}</id>
		<link>$link</link>
		<title></title>
		<content>$body</content>
	</target>
EOT;

	$tagid = DI::baseUrl() . '/search?tag=' . $xterm;
	$objtype = Activity\ObjectType::TAGTERM;

	$obj = <<< EOT
	<object>
		<type>$objtype</type>
		<local>1</local>
		<id>$tagid</id>
		<link>$tagid</link>
		<title>$xterm</title>
		<content>$xterm</content>
	</object>
EOT;

	$bodyverb = DI::l10n()->t('%1$s tagged %2$s\'s %3$s with %4$s');

	if (!isset($bodyverb)) {
		return;
	}

	$termlink = html_entity_decode('&#x2317;') . '[url=' . DI::baseUrl() . '/search?tag=' . $term . ']'. $term . '[/url]';

	$arr = [];

	$arr['guid'] = System::createUUID();
	$arr['uri'] = $uri;
	$arr['uid'] = $owner_uid;
	$arr['contact-id'] = $contact['id'];
	$arr['wall'] = $item['wall'];
	$arr['gravity'] = GRAVITY_COMMENT;
	$arr['parent'] = $item['id'];
	$arr['parent-uri'] = $item['uri'];
	$arr['owner-name'] = $item['author-name'];
	$arr['owner-link'] = $item['author-link'];
	$arr['owner-avatar'] = $item['author-avatar'];
	$arr['author-name'] = $contact['name'];
	$arr['author-link'] = $contact['url'];
	$arr['author-avatar'] = $contact['thumb'];

	$ulink = '[url=' . $contact['url'] . ']' . $contact['name'] . '[/url]';
	$alink = '[url=' . $item['author-link'] . ']' . $item['author-name'] . '[/url]';
	$plink = '[url=' . $item['plink'] . ']' . $post_type . '[/url]';
	$arr['body'] =  sprintf( $bodyverb, $ulink, $alink, $plink, $termlink );

	$arr['verb'] = Activity::TAG;
	$arr['target-type'] = $targettype;
	$arr['target'] = $target;
	$arr['object-type'] = $objtype;
	$arr['object'] = $obj;
	$arr['private'] = $item['private'];
	$arr['allow_cid'] = $item['allow_cid'];
	$arr['allow_gid'] = $item['allow_gid'];
	$arr['deny_cid'] = $item['deny_cid'];
	$arr['deny_gid'] = $item['deny_gid'];
	$arr['visible'] = 1;
	$arr['unseen'] = 1;
	$arr['origin'] = 1;

	$post_id = Item::insert($arr);

	if (!$item['visible']) {
		Item::update(['visible' => true], ['id' => $item['id']]);
	}

	$term_objtype = ($item['resource-id'] ? TERM_OBJ_PHOTO : TERM_OBJ_POST);

	$t = q("SELECT count(tid) as tcount FROM term WHERE oid=%d AND term='%s'",
		intval($item['id']),
		DBA::escape($term)
	);

	if (!$blocktags && $t[0]['tcount'] == 0) {
		q("INSERT INTO term (oid, otype, type, term, url, uid) VALUE (%d, %d, %d, '%s', '%s', %d)",
		   intval($item['id']),
		   $term_objtype,
		   TERM_HASHTAG,
		   DBA::escape($term),
		   '',
		   intval($owner_uid)
		);
	}

	// if the original post is on this site, update it.
	$original_item = Item::selectFirst(['tag', 'id', 'uid'], ['origin' => true, 'uri' => $item['uri']]);
	if (DBA::isResult($original_item)) {
		$x = q("SELECT `blocktags` FROM `user` WHERE `uid`=%d LIMIT 1",
			intval($original_item['uid'])
		);
		$t = q("SELECT COUNT(`tid`) AS `tcount` FROM `term` WHERE `oid`=%d AND `term`='%s'",
			intval($original_item['id']),
			DBA::escape($term)
		);

		if (DBA::isResult($x) && !$x[0]['blocktags'] && $t[0]['tcount'] == 0){
			q("INSERT INTO term (`oid`, `otype`, `type`, `term`, `url`, `uid`) VALUE (%d, %d, %d, '%s', '%s', %d)",
				intval($original_item['id']),
				$term_objtype,
				TERM_HASHTAG,
				DBA::escape($term),
				'',
				intval($owner_uid)
			);
		}
	}


	$arr['id'] = $post_id;

	Hook::callAll('post_local_end', $arr);

	Worker::add(PRIORITY_HIGH, "Notifier", Delivery::POST, $post_id);

	exit();
}