implement federation policies and instance info substitution policy

1 files changed, 30 insertions, 0 deletions

diff --git a/Digitigrade/PolicyManager.php b/Digitigrade/PolicyManager.php
index 24c2c7f..69e2ab0 100644
--- a/Digitigrade/PolicyManager.php
+++ b/Digitigrade/PolicyManager.php
@@ -1,8 +1,10 @@
 <?php
 namespace Digitigrade;
 
+use Digitigrade\HttpResponseStatus\PolicyRejected;
 use Digitigrade\Model\Actor;
 use Digitigrade\Model\FetchableModel;
+use Digitigrade\Model\Instance;
 use Digitigrade\Model\Interaction;
 use Digitigrade\Model\Note;
 
@@ -34,6 +36,34 @@ class PolicyManager extends Singleton {
         };
     }
 
+    public function checkOrThrow(FetchableModel $object) {
+        if (!$this->check($object)) {
+            throw new PolicyRejected();
+        }
+    }
+
+    /**
+     * Checks if an object is allowed to be sent to a certain Instance by all
+     * policies, and possibly alters it.
+     * @param FetchableModel $object the object to check (may be modified in-place)
+     * @param ?Instance $instance the instance it's being sent to (may be null if unknown)
+     * @return bool true if allowed, false if the request should be cancelled
+     */
+    public function checkFederation(FetchableModel $object, ?Instance $instance): bool {
+        return match ($object::class) {
+            Actor::class => self::arrayAll($this->policies, fn(Policy $p) => $p->checkActorFederation($object, $instance)),
+            Interaction::class => self::arrayAll($this->policies, fn(Policy $p) => $p->checkInteractionFederation($object, $instance)),
+            Note::class => self::arrayAll($this->policies, fn(Policy $p) => $p->checkNoteFederation($object, $instance)),
+            default => true
+        };
+    }
+
+    public function checkFederationOrThrow(FetchableModel $object, ?Instance $instance) {
+        if (!$this->checkFederation($object, $instance)) {
+            throw new PolicyRejected();
+        }
+    }
+
     private static function arrayAll(array $arr, callable $test): bool {
         // i would use array_all but that's php 8.4+ only which i don't have lol
         foreach ($arr as $item) {