feat: rotate pictures with API+AlpineJS

sas/api.py

@@ -176,6 +176,19 @@ class PicturesController(ControllerBase):
     def delete_picture(self, picture_id: int):
         self.get_object_or_exception(Picture, pk=picture_id).delete()
 
+    @route.post(
+        "/{picture_id}/rotate/{direction}",
+        permissions=[IsSasAdmin],
+        response=PictureSchema,
+        url_name="rotate_picture",
+    )
+    def rotate_picture(self, picture_id: int, direction: Literal["left", "right"]):
+        """Rotate the given picture and returns its edited data."""
+        angle = 90 if direction == "left" else 270
+        picture = self.get_object_or_exception(Picture, pk=picture_id)
+        picture.rotate(angle)
+        return picture
+
     @route.patch(
         "/{picture_id}/moderation",
         permissions=[IsSasAdmin],