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								<?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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								/**
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								 * ActivityPub implementation for GNU social
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								 *
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								 * @package   GNUsocial
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								 * @category  ActivityPub
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								 *
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								 * @author    Diogo Peralta Cordeiro <@diogo.site>
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								 * @copyright 2018-2019, 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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								namespace Plugin\ActivityPub\Util;
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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
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
							
								// 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.
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								//
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								// 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.
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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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								use App\Core\Event;
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								use XML_XRD;
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								/**
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								 * DiscoveryHints implementation for GNU social
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								 *
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								 * @copyright 2018-2019, 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 DiscoveryHints
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								{
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								    /**
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								     * Search the WebFinger XRD after an ActivityPub URI
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								     */
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								    public static function fromXRD(XML_XRD $xrd): array
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								    {
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								        $hints = [];
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								        if (Event::handle('StartDiscoveryHintsFromXRD', [$xrd, &$hints])) {
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								            foreach ($xrd->links as $link) {
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								                if ($link->rel === 'self' && $link->type === 'application/activity+json') {
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								                    $hints['activitypub'] = $link->href;
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								                    break;
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								                }
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								            }
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								            Event::handle('EndDiscoveryHintsFromXRD', [$xrd, &$hints]);
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								        }
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								        return $hints;
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								    }
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								}
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