gnu-social/components/Tag/Tag.php

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<?php
declare(strict_types = 1);
// {{{ License
// This file is part of GNU social - https://www.gnu.org/software/social
//
// GNU social 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.
//
// GNU social 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 GNU social. If not, see <http://www.gnu.org/licenses/>.
// }}}
namespace Component\Tag;
use App\Core\Cache;
use App\Core\DB\DB;
use App\Core\Event;
use App\Core\Modules\Component;
use App\Core\Router\Router;
use App\Entity\Language;
use App\Entity\Note;
use App\Entity\NoteTag;
use App\Util\Formatting;
use App\Util\HTML;
use Doctrine\Common\Collections\ExpressionBuilder;
use Doctrine\ORM\Query\Expr;
use Doctrine\ORM\QueryBuilder;
/**
* Component responsible for extracting tags from posted notes, as well as normalizing them
*
* @author Hugo Sales <hugo@hsal.es>
* @copyright 2021 Free Software Foundation, Inc http://www.fsf.org
* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
*/
class Tag extends Component
{
public const MAX_TAG_LENGTH = 64;
public const TAG_REGEX = '/(^|\\s)(#[\\pL\\pN_\\-\\.]{1,64})/u'; // Brion Vibber 2011-02-23 v2:classes/Notice.php:367 function saveTags
public const TAG_SLUG_REGEX = '[A-Za-z0-9]{1,64}';
public function onAddRoute($r): bool
{
$r->connect('single_note_tag', '/note-tag/{tag<' . self::TAG_SLUG_REGEX . '>}', [Controller\Tag::class, 'single_note_tag']);
$r->connect('multiple_note_tags', '/note-tags/{tags<(' . self::TAG_SLUG_REGEX . ',)+' . self::TAG_SLUG_REGEX . '>}', [Controller\Tag::class, 'multi_note_tags']);
$r->connect('single_actor_tag', '/actor-tag/{tag<' . self::TAG_SLUG_REGEX . '>}', [Controller\Tag::class, 'single_actor_tag']);
$r->connect('multiple_actor_tags', '/actor-tags/{tags<(' . self::TAG_SLUG_REGEX . ',)+' . self::TAG_SLUG_REGEX . '>}', [Controller\Tag::class, 'multi_actor_tags']);
return Event::next;
}
/**
* Process note by extracting any tags present
*/
public function onProcessNoteContent(Note $note, string $content): bool
{
$matched_tags = [];
$processed_tags = false;
preg_match_all(self::TAG_REGEX, $content, $matched_tags, \PREG_SET_ORDER);
foreach ($matched_tags as $match) {
$tag = str_replace('#', '', self::ensureLength($match[2]));
$canonical_tag = self::canonicalTag($tag, Language::getFromId($note->getLanguageId())->getLocale());
DB::persist(NoteTag::create(['tag' => $tag, 'canonical' => $canonical_tag, 'note_id' => $note->getId()]));
Cache::pushList("tag-{$canonical_tag}", $note);
$processed_tags = true;
}
if ($processed_tags) {
DB::flush();
}
return Event::next;
}
public function onRenderPlainTextNoteContent(string &$text, ?string $language = null): bool
{
$text = preg_replace_callback(self::TAG_REGEX, fn ($m) => $m[1] . self::tagLink($m[2], $language), $text);
return Event::next;
}
private static function tagLink(string $tag, ?string $language): string
{
$tag = self::ensureLength($tag);
$canonical = self::canonicalTag($tag, $language);
$url = Router::url('single_note_tag', !\is_null($language) ? ['tag' => $canonical, 'lang' => $language] : ['tag' => $canonical]);
return HTML::html(['a' => ['attrs' => ['href' => $url, 'title' => $tag, 'rel' => 'tag'], $tag]], options: ['indent' => false]);
}
public static function ensureLength(string $tag): string
{
return mb_substr($tag, 0, self::MAX_TAG_LENGTH);
}
/**
* Convert a tag to it's canonical representation, by splitting it
* into words, stemming it in the given language (if enabled) and
* sluggifying it (turning it into an ASCII representation)
*/
public static function canonicalTag(string $tag, ?string $language): string
{
$result = '';
foreach (Formatting::splitWords(str_replace('#', '', $tag)) as $word) {
$temp_res = null;
if (\is_null($language) || Event::handle('StemWord', [$language, $word, &$temp_res]) !== Event::stop) {
$temp_res = $word;
}
$result .= Formatting::slugify($temp_res);
}
return self::ensureLength($result);
}
/**
* Populate $note_expr with an expression to match a tag, if the term looks like a tag
*
* $term /^(note|tag|people|actor)/ means we want to match only either a note or an actor
*/
public function onSearchCreateExpression(ExpressionBuilder $eb, string $term, &$note_expr, &$actor_expr): bool
{
$search_term = str_contains($term, ':#') ? explode(':', $term)[1] : $term;
$temp_note_expr = $eb->eq('note_tag.tag', $search_term);
$temp_actor_expr = $eb->eq('actor_tag.tag', $search_term);
if (Formatting::startsWith($term, ['note', 'tag'])) {
$note_expr = $temp_note_expr;
} else {
if (Formatting::startsWith($term, ['people', 'actor'])) {
$actor_expr = $temp_actor_expr;
} else {
$note_expr = $temp_note_expr;
$actor_expr = $temp_actor_expr;
return Event::next;
}
}
return Event::stop;
}
public function onSearchQueryAddJoins(QueryBuilder &$note_qb, QueryBuilder &$actor_qb): bool
{
$note_qb->join('App\Entity\NoteTag', 'note_tag', Expr\Join::WITH, 'note_tag.note_id = note.id');
$actor_qb->join('App\Entity\ActorTag', 'actor_tag', Expr\Join::WITH, 'actor_tag.tagger = actor.id');
return Event::next;
}
}