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[ActivityPub] Fix handling of Delete Activity 

inbox_handler:
- Call stronger validation method for Delete Activity objects
- Take into account mixed object in handle_delete

Activitypub_delete:
- Add validation method for Delete Activity objects
This commit is contained in:
tenma 2019-08-08 17:21:56 +01:00 committed by Diogo Cordeiro
parent 1398d6cc21
commit 054f4e77f5
2 changed files with 40 additions and 5 deletions
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35
plugins/ActivityPub/classes/Activitypub_delete.php
View File

@ -39,12 +39,12 @@ class Activitypub_delete extends Managed_DataObject
/**
* Generates an ActivityPub representation of a Delete
*
* @param $actor
* @param array $object
* @param string $actor actor URI
* @param string $object object URI
* @return array pretty array to be used in a response
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
public static function delete_to_array($actor, $object)
public static function delete_to_array(string $actor, string $object): array
{
$res = [
'@context' => 'https://www.w3.org/ns/activitystreams',
@ -55,4 +55,33 @@ class Activitypub_delete extends Managed_DataObject
];
return $res;
}
/**
* Verifies if a given object is acceptable for a Delete Activity.
*
* @param array|string $object
* @return bool
* @throws Exception
* @author Bruno Casteleiro <brunoccast@fc.up.pt>
*/
public static function validate_object($object): bool
{
if (!is_array($object)) {
if (!filter_var($object, FILTER_VALIDATE_URL)) {
throw new Exception('Object is not a valid Object URI for Activity.');
}
} else {
if (!isset($object['type'])) {
throw new Exception('Object type was not specified for Delete Activity.');
} else if ($object['type'] !== "Tombstone") {
throw new Exception('Invalid Object type for Delete Activity.');
}
if (!isset($object['id'])) {
throw new Exception('Object id was not specified for Delete Activity.');
}
}
return true;
}
}

10
plugins/ActivityPub/lib/inbox_handler.php
View File

@ -96,6 +96,8 @@ class Activitypub_inbox_handler
Activitypub_create::validate_object($this->object);
break;
case 'Delete':
Activitypub_delete::validate_object($this->object);
break;
case 'Follow':
case 'Like':
case 'Announce':
@ -207,12 +209,16 @@ class Activitypub_inbox_handler
* Handles a Delete Activity received by our inbox.
*
* @param Profile $actor Actor
* @param array $object Activity
* @param array|string $object Activity's object
* @throws AuthorizationException
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
private function handle_delete($actor, $object)
private function handle_delete(Profile $actor, $object)
{
if (is_array($object)) {
$object = $object['id'];
}
// some moderator could already have deleted the
// notice, so we test it first
try {