Activitypub_undo.php 3.0 KB

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  1. <?php
  2. /**
  3. * GNU social - a federating social network
  4. *
  5. * ActivityPubPlugin implementation for GNU Social
  6. *
  7. * LICENCE: This program is free software: you can redistribute it and/or modify
  8. * it under the terms of the GNU Affero General Public License as published by
  9. * the Free Software Foundation, either version 3 of the License, or
  10. * (at your option) any later version.
  11. *
  12. * This program is distributed in the hope that it will be useful,
  13. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  15. * GNU Affero General Public License for more details.
  16. *
  17. * You should have received a copy of the GNU Affero General Public License
  18. * along with this program. If not, see <http://www.gnu.org/licenses/>.
  19. *
  20. * @category Plugin
  21. * @package GNUsocial
  22. * @author Diogo Cordeiro <diogo@fc.up.pt>
  23. * @copyright 2018 Free Software Foundation http://fsf.org
  24. * @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
  25. * @link https://www.gnu.org/software/social/
  26. */
  27. if (!defined('GNUSOCIAL')) {
  28. exit(1);
  29. }
  30. /**
  31. * ActivityPub error representation
  32. *
  33. * @category Plugin
  34. * @package GNUsocial
  35. * @author Diogo Cordeiro <diogo@fc.up.pt>
  36. * @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
  37. * @link http://www.gnu.org/software/social/
  38. */
  39. class Activitypub_undo extends Managed_DataObject
  40. {
  41. /**
  42. * Generates an ActivityPub representation of a Undo
  43. *
  44. * @author Diogo Cordeiro <diogo@fc.up.pt>
  45. * @param array $object
  46. * @return pretty array to be used in a response
  47. */
  48. public static function undo_to_array($object)
  49. {
  50. $res = [
  51. '@context' => 'https://www.w3.org/ns/activitystreams',
  52. 'id' => $object['id'].'/undo',
  53. 'type' => 'Undo',
  54. 'actor' => $object['actor'],
  55. 'object' => $object
  56. ];
  57. return $res;
  58. }
  59. /**
  60. * Verifies if a given object is acceptable for a Undo Activity.
  61. *
  62. * @author Diogo Cordeiro <diogo@fc.up.pt>
  63. * @param Array $object
  64. * @throws Exception
  65. */
  66. public static function validate_object($object)
  67. {
  68. if (!is_array($object)) {
  69. throw new Exception('Invalid Object Format for Undo Activity.');
  70. }
  71. if (!isset($object['type'])) {
  72. throw new Exception('Object type was not specified for Undo Activity.');
  73. }
  74. switch ($object['type']) {
  75. case 'Follow':
  76. case 'Like':
  77. // Validate data
  78. if (!filter_var($object['object'], FILTER_VALIDATE_URL)) {
  79. throw new Exception('Object is not a valid Object URI for Activity.');
  80. }
  81. break;
  82. default:
  83. throw new Exception('This is not a supported Object Type for Undo Activity.');
  84. }
  85. return true;
  86. }
  87. }