feat(ffi): allow setting the media retention policy from the FFI layer

bindings/matrix-sdk-ffi/src/client.rs

@@ -21,7 +21,7 @@ use matrix_sdk::{
     event_cache::EventCacheError,
     media::{
         MediaFileHandle as SdkMediaFileHandle, MediaFormat, MediaRequestParameters,
-        MediaThumbnailSettings,
+        MediaRetentionPolicy, MediaThumbnailSettings,
     },
     ruma::{
         api::client::{
@@ -1161,6 +1161,19 @@ impl Client {
         self.inner.is_room_alias_available(&alias).await.map_err(Into::into)
     }
 
+    /// Set the media retention policy.
+    pub async fn set_media_retention_policy(
+        &self,
+        policy: MediaRetentionPolicy,
+    ) -> Result<(), ClientError> {
+        let closure = async || -> Result<_, EventCacheError> {
+            let store = self.inner.event_cache_store().lock().await?;
+            Ok(store.set_media_retention_policy(policy).await?)
+        };
+
+        Ok(closure().await?)
+    }
+
     /// Clear all the non-critical caches for this Client instance.
     ///
     /// - This will empty all the room's persisted event caches, so all rooms

crates/matrix-sdk-base/src/event_cache/store/media/media_retention_policy.rs

@@ -33,6 +33,7 @@ use serde::{Deserialize, Serialize};
 ///
 /// [`EventCacheStore`]: crate::event_cache::store::EventCacheStore
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+#[cfg_attr(feature = "uniffi", derive(uniffi::Record))]
 #[non_exhaustive]
 pub struct MediaRetentionPolicy {
     /// The maximum authorized size of the overall media cache, in bytes.