196 lines
8.1 KiB
PHP
196 lines
8.1 KiB
PHP
<?php
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declare(strict_types = 1);
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// {{{ License
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// This file is part of GNU social - https://www.gnu.org/software/social
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//
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// GNU social 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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// GNU social 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 GNU social. If not, see <http://www.gnu.org/licenses/>.
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// }}}
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namespace Component\Tag;
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use App\Core\Cache;
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use App\Core\DB\DB;
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use App\Core\Event;
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use function App\Core\I18n\_m;
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use App\Core\Modules\Component;
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use App\Core\Router\Router;
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use App\Entity\Actor;
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use App\Entity\ActorTag;
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use App\Entity\Language;
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use App\Entity\Note;
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use App\Entity\NoteTag;
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use App\Util\Exception\ClientException;
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use App\Util\Formatting;
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use App\Util\HTML;
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use Doctrine\Common\Collections\ExpressionBuilder;
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use Doctrine\ORM\Query\Expr;
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use Doctrine\ORM\QueryBuilder;
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use Functional as F;
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use Symfony\Component\Form\Extension\Core\Type\CheckboxType;
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use Symfony\Component\HttpFoundation\Request;
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/**
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* Component responsible for extracting tags from posted notes, as well as normalizing them
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*
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* @author Hugo Sales <hugo@hsal.es>
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* @copyright 2021 Free Software Foundation, Inc http://www.fsf.org
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* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
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*/
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class Tag extends Component
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{
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public const MAX_TAG_LENGTH = 64;
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public const TAG_REGEX = '/(^|\\s)(#[\\pL\\pN_\\-\\.]{1,64})/u'; // Brion Vibber 2011-02-23 v2:classes/Notice.php:367 function saveTags
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public const TAG_SLUG_REGEX = '[A-Za-z0-9]{1,64}';
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public function onAddRoute($r): bool
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{
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$r->connect('single_note_tag', '/note-tag/{canon<' . self::TAG_SLUG_REGEX . '>}', [Controller\Tag::class, 'single_note_tag']);
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$r->connect('multi_note_tags', '/note-tags/{canons<(' . self::TAG_SLUG_REGEX . ',)+' . self::TAG_SLUG_REGEX . '>}', [Controller\Tag::class, 'multi_note_tags']);
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$r->connect('single_actor_tag', '/actor-tag/{canon<' . self::TAG_SLUG_REGEX . '>}', [Controller\Tag::class, 'single_actor_tag']);
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$r->connect('multi_actor_tags', '/actor-tags/{canons<(' . self::TAG_SLUG_REGEX . ',)+' . self::TAG_SLUG_REGEX . '>}', [Controller\Tag::class, 'multi_actor_tags']);
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return Event::next;
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}
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/**
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* Process note by extracting any tags present
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*/
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public function onProcessNoteContent(Note $note, string $content, string $content_type, array $extra_args): bool
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{
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$matched_tags = [];
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$processed_tags = false;
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preg_match_all(self::TAG_REGEX, $content, $matched_tags, \PREG_SET_ORDER);
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$matched_tags = array_unique(F\map($matched_tags, fn ($m) => $m[2]));
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foreach ($matched_tags as $match) {
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$tag = self::ensureValid($match);
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$canonical_tag = self::canonicalTag($tag, Language::getById($note->getLanguageId())->getLocale());
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DB::persist(NoteTag::create([
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'tag' => $tag,
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'canonical' => $canonical_tag,
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'note_id' => $note->getId(),
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'use_canonical' => $extra_args['tag_use_canonical'] ?? false,
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]));
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Cache::pushList("tag-{$canonical_tag}", $note);
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$processed_tags = true;
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foreach (self::cacheKeys($canonical_tag) as $key) {
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Cache::delete($key);
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}
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}
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if ($processed_tags) {
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DB::flush();
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}
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return Event::next;
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}
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public function onRenderPlainTextNoteContent(string &$text, ?string $language = null): bool
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{
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$text = preg_replace_callback(self::TAG_REGEX, fn ($m) => $m[1] . self::tagLink($m[2], $language), $text);
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return Event::next;
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}
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public static function cacheKeys(string $canon_single_or_multi): array
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{
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return [
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'note_single' => "note-tag-feed-{$canon_single_or_multi}",
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'note_multi' => "note-tags-feed-{$canon_single_or_multi}",
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'actor_single' => "actor-tag-feed-{$canon_single_or_multi}",
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'actor_multi' => "actor-tags-feed-{$canon_single_or_multi}",
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];
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}
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private static function tagLink(string $tag, ?string $language): string
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{
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$tag = self::ensureLength($tag);
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$canonical = self::canonicalTag($tag, $language);
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$url = Router::url('single_note_tag', !\is_null($language) ? ['canon' => $canonical, 'lang' => $language, 'tag' => $tag] : ['canon' => $canonical, 'tag' => $tag]);
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return HTML::html(['a' => ['attrs' => ['href' => $url, 'title' => $tag, 'rel' => 'tag'], $tag]], options: ['indent' => false]);
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}
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public static function ensureValid(string $tag)
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{
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return self::ensureLength(str_replace('#', '', $tag));
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}
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public static function ensureLength(string $tag): string
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{
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return mb_substr($tag, 0, self::MAX_TAG_LENGTH);
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}
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/**
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* Convert a tag to it's canonical representation, by splitting it
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* into words, stemming it in the given language (if enabled) and
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* sluggifying it (turning it into an ASCII representation)
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*/
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public static function canonicalTag(string $tag, ?string $language): string
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{
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$result = '';
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foreach (Formatting::splitWords(str_replace('#', '', $tag)) as $word) {
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$temp_res = null;
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if (\is_null($language) || Event::handle('StemWord', [$language, $word, &$temp_res]) !== Event::stop) {
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$temp_res = $word;
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}
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$result .= Formatting::slugify($temp_res);
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}
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return self::ensureLength($result);
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}
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/**
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* Populate $note_expr with an expression to match a tag, if the term looks like a tag
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*
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* $term /^(note|tag|people|actor)/ means we want to match only either a note or an actor
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*/
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public function onSearchCreateExpression(ExpressionBuilder $eb, string $term, ?string $language, &$note_expr, &$actor_expr): bool
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{
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$search_term = str_contains($term, ':#') ? explode(':', $term)[1] : $term;
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$canon_search_term = self::canonicalTag($search_term, $language);
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$temp_note_expr = $eb->eq('note_tag.canonical', $canon_search_term);
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$temp_actor_expr = $eb->eq('actor_tag.canonical', $canon_search_term);
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if (Formatting::startsWith($term, ['note:', 'tag:', 'people:'])) {
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$note_expr = $temp_note_expr;
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} elseif (Formatting::startsWith($term, ['people:', 'actor:'])) {
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$actor_expr = $temp_actor_expr;
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} elseif (str_contains($term, '#')) {
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$note_expr = $temp_note_expr;
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$actor_expr = $temp_actor_expr;
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return Event::next;
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}
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return Event::stop;
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}
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public function onSearchQueryAddJoins(QueryBuilder &$note_qb, QueryBuilder &$actor_qb): bool
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{
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$note_qb->leftJoin(NoteTag::class, 'note_tag', Expr\Join::WITH, 'note_tag.note_id = note.id');
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$actor_qb->leftJoin(ActorTag::class, 'actor_tag', Expr\Join::WITH, 'actor_tag.tagger = actor.id');
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return Event::next;
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}
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public function onPostingAddFormEntries(Request $request, Actor $actor, array &$form_params)
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{
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$form_params[] = ['tag_use_canonical', CheckboxType::class, ['required' => false, 'data' => true, 'label' => _m('Make note tags canonical'), 'help' => _m('Canonical tags will be treated as a version of an existing tag with the same root/stem (e.g. \'#great_tag\' will be considered as a version of \'#great\', if it already exists)')]];
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return Event::next;
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}
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public function onPostingHandleForm(Request $request, Actor $actor, array $data, array &$extra_args)
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{
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if (!isset($data['tag_use_canonical'])) {
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throw new ClientException;
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}
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$extra_args['tag_use_canonical'] = $data['tag_use_canonical'];
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return Event::next;
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}
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}
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