feat(base): Add the Verification request processor.

crates/matrix-sdk-base/src/response_processors/verification.rs

@@ -0,0 +1,37 @@
+// Copyright 2025 The Matrix.org Foundation C.I.C.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+use matrix_sdk_crypto::OlmMachine;
+use ruma::{events::AnySyncMessageLikeEvent, RoomId};
+
+use super::Context;
+use crate::Result;
+
+pub async fn verification(
+    _context: &mut Context,
+    verification_is_allowed: bool,
+    olm_machine: Option<&OlmMachine>,
+    event: &AnySyncMessageLikeEvent,
+    room_id: &RoomId,
+) -> Result<()> {
+    if !verification_is_allowed {
+        return Ok(());
+    }
+
+    if let Some(olm) = olm_machine {
+        olm.receive_verification_event(&event.clone().into_full_event(room_id.to_owned())).await?;
+    }
+
+    Ok(())
+}