diff --git a/app/src/main/java/audio/funkwhale/ffa/koin/Modules.kt b/app/src/main/java/audio/funkwhale/ffa/koin/Modules.kt
index 936019c..028f771 100644
--- a/app/src/main/java/audio/funkwhale/ffa/koin/Modules.kt
+++ b/app/src/main/java/audio/funkwhale/ffa/koin/Modules.kt
@@ -4,10 +4,13 @@ import android.content.Context
 import audio.funkwhale.ffa.playback.CacheDataSourceFactoryProvider
 import audio.funkwhale.ffa.playback.MediaSession
 import audio.funkwhale.ffa.utils.AuthorizationServiceFactory
-import audio.funkwhale.ffa.utils.DefaultOAuth
 import audio.funkwhale.ffa.utils.OAuth
 import com.google.android.exoplayer2.database.DatabaseProvider
 import com.google.android.exoplayer2.database.ExoDatabaseProvider
+import com.google.android.exoplayer2.offline.DefaultDownloadIndex
+import com.google.android.exoplayer2.offline.DefaultDownloaderFactory
+import com.google.android.exoplayer2.offline.DownloadManager
+import com.google.android.exoplayer2.offline.DownloaderConstructorHelper
 import com.google.android.exoplayer2.upstream.cache.Cache
 import com.google.android.exoplayer2.upstream.cache.LeastRecentlyUsedCacheEvictor
 import com.google.android.exoplayer2.upstream.cache.NoOpCacheEvictor
@@ -22,6 +25,19 @@ fun exoplayerModule(context: Context) = module {
     ExoDatabaseProvider(context)
   }
 
+  single {
+    val cacheDataSourceFactoryProvider = get<CacheDataSourceFactoryProvider>()
+    DownloaderConstructorHelper(
+      get(named("exoDownloadCache")), cacheDataSourceFactoryProvider.create(context)
+    ).run {
+      DownloadManager(
+        context,
+        DefaultDownloadIndex(get(named("exoDatabase"))),
+        DefaultDownloaderFactory(this)
+      )
+    }
+  }
+
   single {
     CacheDataSourceFactoryProvider(
       get(),
@@ -52,7 +68,6 @@ fun exoplayerModule(context: Context) = module {
 }
 
 fun authModule() = module {
-  single<OAuth> { DefaultOAuth(get()) }
-
+  single { OAuth(get()) }
   single { AuthorizationServiceFactory() }
 }
\ No newline at end of file
diff --git a/app/src/main/java/audio/funkwhale/ffa/repositories/FavoritesRepository.kt b/app/src/main/java/audio/funkwhale/ffa/repositories/FavoritesRepository.kt
index 84e27cf..049c115 100644
--- a/app/src/main/java/audio/funkwhale/ffa/repositories/FavoritesRepository.kt
+++ b/app/src/main/java/audio/funkwhale/ffa/repositories/FavoritesRepository.kt
@@ -7,7 +7,6 @@ import com.github.kittinunf.fuel.coroutines.awaitByteArrayResponseResult
 import com.github.kittinunf.fuel.gson.gsonDeserializerOf
 import com.google.android.exoplayer2.offline.DownloadManager
 import com.google.android.exoplayer2.upstream.cache.Cache
-import com.google.android.exoplayer2.upstream.cache.SimpleCache
 import com.google.gson.Gson
 import com.google.gson.reflect.TypeToken
 import kotlinx.coroutines.CoroutineScope
diff --git a/app/src/main/java/audio/funkwhale/ffa/repositories/SearchRepository.kt b/app/src/main/java/audio/funkwhale/ffa/repositories/SearchRepository.kt
index 0ccb5c8..c23788c 100644
--- a/app/src/main/java/audio/funkwhale/ffa/repositories/SearchRepository.kt
+++ b/app/src/main/java/audio/funkwhale/ffa/repositories/SearchRepository.kt
@@ -5,7 +5,6 @@ import audio.funkwhale.ffa.utils.*
 import com.github.kittinunf.fuel.gson.gsonDeserializerOf
 import com.google.android.exoplayer2.offline.DownloadManager
 import com.google.android.exoplayer2.upstream.cache.Cache
-import com.google.android.exoplayer2.upstream.cache.SimpleCache
 import com.google.gson.reflect.TypeToken
 import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.toList
diff --git a/app/src/main/java/audio/funkwhale/ffa/repositories/TracksRepository.kt b/app/src/main/java/audio/funkwhale/ffa/repositories/TracksRepository.kt
index d06fdeb..b6b5f3e 100644
--- a/app/src/main/java/audio/funkwhale/ffa/repositories/TracksRepository.kt
+++ b/app/src/main/java/audio/funkwhale/ffa/repositories/TracksRepository.kt
@@ -6,7 +6,6 @@ import com.github.kittinunf.fuel.gson.gsonDeserializerOf
 import com.google.android.exoplayer2.offline.Download
 import com.google.android.exoplayer2.offline.DownloadManager
 import com.google.android.exoplayer2.upstream.cache.Cache
-import com.google.android.exoplayer2.upstream.cache.SimpleCache
 import com.google.gson.reflect.TypeToken
 import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.toList
diff --git a/app/src/main/java/audio/funkwhale/ffa/utils/OAuth.kt b/app/src/main/java/audio/funkwhale/ffa/utils/OAuth.kt
index 518e284..25fcd32 100644
--- a/app/src/main/java/audio/funkwhale/ffa/utils/OAuth.kt
+++ b/app/src/main/java/audio/funkwhale/ffa/utils/OAuth.kt
@@ -30,27 +30,6 @@ fun AuthState.save() {
   }
 }
 
-interface OAuth {
-
-  fun exchange(context: Context, authorization: Intent, success: () -> Unit, error: () -> Unit)
-
-  fun init(hostname: String): AuthState
-
-  fun register(authState: AuthState? = null, callback: () -> Unit)
-
-  fun authorize(activity: Activity)
-
-  fun isAuthorized(context: Context): Boolean
-
-  fun tryRefreshAccessToken(context: Context): Boolean
-
-  fun tryState(): AuthState?
-
-  fun state(): AuthState
-
-  fun service(context: Context): AuthorizationService
-}
-
 class AuthorizationServiceFactory {
 
   fun create(context: Context): AuthorizationService {
@@ -58,17 +37,16 @@ class AuthorizationServiceFactory {
   }
 }
 
-class DefaultOAuth(private val authorizationServiceFactory: AuthorizationServiceFactory) : OAuth {
+class OAuth(private val authorizationServiceFactory: AuthorizationServiceFactory) {
 
   companion object {
-
     private val REDIRECT_URI =
       Uri.parse("urn:/audio.funkwhale.funkwhale-android/oauth/callback")
   }
 
   data class App(val client_id: String, val client_secret: String)
 
-  override fun tryState(): AuthState? {
+  fun tryState(): AuthState? {
 
     val savedState = PowerPreference
       .getFileByName(AppContext.PREFS_CREDENTIALS)
@@ -81,10 +59,10 @@ class DefaultOAuth(private val authorizationServiceFactory: AuthorizationService
     }
   }
 
-  override fun state(): AuthState =
+  fun state(): AuthState =
     tryState() ?: throw IllegalStateException("Couldn't find saved state")
 
-  override fun isAuthorized(context: Context): Boolean {
+  fun isAuthorized(context: Context): Boolean {
     val state = tryState()
     return if (state != null) {
       state.isAuthorized || doTryRefreshAccessToken(state, context)
@@ -95,7 +73,7 @@ class DefaultOAuth(private val authorizationServiceFactory: AuthorizationService
     }
   }
 
-  override fun tryRefreshAccessToken(context: Context): Boolean {
+  fun tryRefreshAccessToken(context: Context): Boolean {
     tryState()?.let { state ->
       return doTryRefreshAccessToken(state, context)
     }
@@ -124,23 +102,22 @@ class DefaultOAuth(private val authorizationServiceFactory: AuthorizationService
       }
   }
 
-  override fun init(hostname: String): AuthState {
+  fun init(hostname: String): AuthState {
     return AuthState(
       AuthorizationServiceConfiguration(
         Uri.parse("$hostname/authorize"),
         Uri.parse("$hostname/api/v1/oauth/token/"),
         Uri.parse("$hostname/api/v1/oauth/apps/")
       )
-    )
-      .also {
-        it.save()
-      }
+    ).also {
+      it.save()
+    }
   }
 
-  override fun service(context: Context): AuthorizationService =
+  fun service(context: Context): AuthorizationService =
     authorizationServiceFactory.create(context)
 
-  override fun register(authState: AuthState?, callback: () -> Unit) {
+  fun register(authState: AuthState? = null, callback: () -> Unit) {
     (authState ?: state()).authorizationServiceConfiguration?.let { config ->
       runBlocking {
         val (_, _, result: Result<App, FuelError>) = Fuel.post(config.registrationEndpoint.toString())
@@ -183,7 +160,7 @@ class DefaultOAuth(private val authorizationServiceFactory: AuthorizationService
     )
   }
 
-  override fun authorize(activity: Activity) {
+  fun authorize(activity: Activity) {
     val authService = service(activity)
     authorizationRequest()?.let { it ->
       val intent = authService.getAuthorizationRequestIntent(it)
@@ -191,7 +168,7 @@ class DefaultOAuth(private val authorizationServiceFactory: AuthorizationService
     }
   }
 
-  override fun exchange(
+  fun exchange(
     context: Context,
     authorization: Intent,
     success: () -> Unit,
diff --git a/app/src/test/java/audio/funkwhale/ffa/utils/DefaultOAuthTest.kt b/app/src/test/java/audio/funkwhale/ffa/utils/OAuthTest.kt
similarity index 99%
rename from app/src/test/java/audio/funkwhale/ffa/utils/DefaultOAuthTest.kt
rename to app/src/test/java/audio/funkwhale/ffa/utils/OAuthTest.kt
index 52a117a..cba3780 100644
--- a/app/src/test/java/audio/funkwhale/ffa/utils/DefaultOAuthTest.kt
+++ b/app/src/test/java/audio/funkwhale/ffa/utils/OAuthTest.kt
@@ -33,10 +33,10 @@ import strikt.assertions.isNotNull
 import strikt.assertions.isNull
 import strikt.assertions.isTrue
 
-class DefaultOAuthTest {
+class OAuthTest {
 
   @InjectMockKs
-  private lateinit var oAuth: DefaultOAuth
+  private lateinit var oAuth: OAuth
 
   @MockK
   private lateinit var authServiceFactory: AuthorizationServiceFactory