crypto: Add a method to set the verification state of devices.

matrix_sdk_crypto/src/device.rs

@@ -128,6 +128,14 @@ impl Device {
         self.trust_state.load(Ordering::Relaxed)
     }
 
+    /// Set the trust state of the device to the given state.
+    ///
+    /// Note: This should only done in the cryptostore where the trust state can
+    /// be stored.
+    pub(crate) fn set_trust_state(&self, state: TrustState) {
+        self.trust_state.store(state, Ordering::Relaxed)
+    }
+
     /// Get the list of algorithms this device supports.
     pub fn algorithms(&self) -> &[Algorithm] {
         &self.algorithms

matrix_sdk_crypto/src/store/mod.rs

@@ -23,7 +23,7 @@ use matrix_sdk_common::locks::Mutex;
 use serde_json::Error as SerdeError;
 use thiserror::Error;
 
-use super::device::Device;
+use super::device::{Device, TrustState};
 use super::memory_stores::UserDevices;
 use super::olm::{Account, InboundGroupSession, Session};
 use matrix_sdk_common::identifiers::{DeviceId, RoomId, UserId};
@@ -188,4 +188,19 @@ pub trait CryptoStore: Debug {
     ///
     /// * `user_id` - The user for which we should get all the devices.
     async fn get_user_devices(&self, user_id: &UserId) -> Result<UserDevices>;
+
+    /// Set the trust state of the given device.
+    ///
+    /// # Arguments
+    ///
+    /// * `device` - The device that should have its trust state changed.
+    ///
+    /// * `state` - The new state that should be set on the device.
+    async fn set_device_verification(&self, device: Device, state: TrustState) -> Result<()>
+    where
+        Self: Sized,
+    {
+        device.set_trust_state(state);
+        self.save_devices(&[device]).await
+    }
 }