Adding a method to retrieve livedata of crypto device info for a given device id

matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/session/crypto/CryptoService.kt

@@ -122,6 +122,8 @@ interface CryptoService {
 
     fun getLiveCryptoDeviceInfo(): LiveData<List<CryptoDeviceInfo>>
 
+    fun getLiveCryptoDeviceInfoWithId(deviceId: String): LiveData<Optional<CryptoDeviceInfo>>
+
     fun getLiveCryptoDeviceInfo(userId: String): LiveData<List<CryptoDeviceInfo>>
 
     fun getLiveCryptoDeviceInfo(userIds: List<String>): LiveData<List<CryptoDeviceInfo>>

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/crypto/DefaultCryptoService.kt

@@ -534,6 +534,10 @@ internal class DefaultCryptoService @Inject constructor(
         return cryptoStore.getLiveDeviceList()
     }
 
+    override fun getLiveCryptoDeviceInfoWithId(deviceId: String): LiveData<Optional<CryptoDeviceInfo>> {
+        return cryptoStore.getLiveDeviceWithId(deviceId)
+    }
+
     override fun getLiveCryptoDeviceInfo(userId: String): LiveData<List<CryptoDeviceInfo>> {
         return cryptoStore.getLiveDeviceList(userId)
     }

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/crypto/store/IMXCryptoStore.kt

@@ -238,6 +238,8 @@ internal interface IMXCryptoStore {
     // TODO temp
     fun getLiveDeviceList(): LiveData<List<CryptoDeviceInfo>>
 
+    fun getLiveDeviceWithId(deviceId: String): LiveData<Optional<CryptoDeviceInfo>>
+
     fun getMyDevicesInfo(): List<DeviceInfo>
 
     fun getLiveMyDevicesInfo(): LiveData<List<DeviceInfo>>

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/crypto/store/db/RealmCryptoStore.kt

@@ -581,6 +581,12 @@ internal class RealmCryptoStore @Inject constructor(
         }
     }
 
+    override fun getLiveDeviceWithId(deviceId: String): LiveData<Optional<CryptoDeviceInfo>> {
+        return Transformations.map(getLiveDeviceList()) { devices ->
+            devices.firstOrNull { it.deviceId == deviceId }.toOptional()
+        }
+    }
+
     override fun getMyDevicesInfo(): List<DeviceInfo> {
         return monarchy.fetchAllCopiedSync {
             it.where<MyDeviceLastSeenInfoEntity>()