4 files changed, 79 insertions, 2 deletions

diff --git a/Digitigrade/Model/FetchableModel.php b/Digitigrade/Model/FetchableModel.php
index 33e1151..1120823 100644
--- a/Digitigrade/Model/FetchableModel.php
+++ b/Digitigrade/Model/FetchableModel.php
@@ -13,7 +13,7 @@ abstract class FetchableModel extends Model implements RemoteFetchable {
         self::$mapper->bStrictObjectTypeChecking = false;
     }
 
-    protected static function createFromJson(\stdClass $data, bool $autoSave): static {
+    protected static function createFromJson(\stdClass $data, bool $autoSave, ?string $uri = null): static {
         // default everything nullable to null
         $obj = new static();
         $reflProps = (new \ReflectionClass(static::class))->getProperties();
@@ -62,9 +62,12 @@ abstract class FetchableModel extends Model implements RemoteFetchable {
         if ($data === null)
             return null;
 
-        $obj = static::createFromJson($data, $autoSave);
+        $obj = static::createFromJson($data, $autoSave, $uri);
 
         $obj->finaliseAfterFetch($uri);
+        if (!$obj->validate()) {
+            return null; // and don't save
+        }
         if ($autoSave) {
             $obj->save();
             $obj->finaliseAfterSave();
diff --git a/Digitigrade/Model/Interaction.php b/Digitigrade/Model/Interaction.php
new file mode 100644
index 0000000..bf0745e
--- /dev/null
+++ b/Digitigrade/Model/Interaction.php
@@ -0,0 +1,62 @@
+<?php
+namespace Digitigrade\Model;
+
+class Interaction extends PushableModel {
+    public ?int $id;
+    public string $uri;
+    public \DateTimeImmutable $created;
+    public ?\DateTimeImmutable $modified;
+    public Actor $author;
+    public InteractionKind $kind;
+    public Note $target;
+    public array $extensions = [];
+
+    public static function create(Actor $author, InteractionKind $kind, Note $target) {
+        $inter = new self();
+        $inter->uri = "UNKNOWN";
+        $inter->created = new \DateTimeImmutable();
+        $inter->author = $author;
+        $inter->kind = $kind;
+        $inter->target = $target;
+
+        $inter->save();
+        $inter->uri = path_to_uri("/interaction/$inter->id");
+        $inter->save();
+
+        return $inter;
+    }
+
+    protected function getUpdateWhereClause(\PDO $db): ?string {
+        if (self::findWhere('uri = ?', [$this->uri]) != null)
+            return 'uri = ' . $db->quote($this->uri);
+        if (self::findWhere('id = ?', [$this->id]) != null)
+            return "id = $this->id";
+        return null;
+    }
+
+    protected function validate(): bool {
+        // author has to be from the same instance as the interaction itself
+        return hostname_from_uri($this->author->uri) == hostname_from_uri($this->uri);
+    }
+
+    public static function findAllWithAuthor(Actor $author): array {
+        return self::findAllWhere('author = ?', [$author->id]);
+    }
+
+    public static function findAllWithTarget(Note $target): array {
+        return self::findAllWhere('target = ?', [$target->id]);
+    }
+
+    public function jsonSerialize(): array {
+        return [
+            'type' => 'interaction',
+            'self' => path_to_uri("/interaction/$this->id"),
+            'created' => $this->created->format('c'),
+            'modified' => $this->modified?->format('c'),
+            'author' => $this->author->uri,
+            'kind' => $this->kind->value,
+            'target' => $this->target->uri,
+            //'extensions' => []
+        ];
+    }
+}
\ No newline at end of file
diff --git a/Digitigrade/Model/InteractionKind.php b/Digitigrade/Model/InteractionKind.php
new file mode 100644
index 0000000..2fd09c9
--- /dev/null
+++ b/Digitigrade/Model/InteractionKind.php
@@ -0,0 +1,8 @@
+<?php
+namespace Digitigrade\Model;
+
+enum InteractionKind: string {
+    case LIKE = 'like';
+    case DISLIKE = 'dislike';
+    case RESHARE = 'reshare';
+}
\ No newline at end of file
diff --git a/Digitigrade/Model/Note.php b/Digitigrade/Model/Note.php
index dd66c85..0117a3c 100644
--- a/Digitigrade/Model/Note.php
+++ b/Digitigrade/Model/Note.php
@@ -105,6 +105,10 @@ class Note extends PushableModel {
         return self::findAllWhere('author = ?', [$author->id]);
     }
 
+    public function getInteractions(): array {
+        return Interaction::findAllWithTarget($this);
+    }
+
     public function jsonSerialize(): array {
         return [
             'type' => 'note',