refactor(android): enforce DI encapsulation

android/src/main/kotlin/dev/msfjarvis/claw/android/ui/LobstersApp.kt

@@ -259,7 +259,8 @@ fun LobstersApp(
           composable(route = Destinations.DataTransfer.route) {
             DataTransferScreen(
               context = context,
-              dataTransferRepository = viewModel.dataTransferRepository,
+              importPosts = viewModel::importPosts,
+              exportPosts = viewModel::exportPosts,
               snackbarHostState = snackbarHostState,
             )
           }

android/src/main/kotlin/dev/msfjarvis/claw/android/ui/datatransfer/DataTransferScreen.kt

@@ -25,7 +25,8 @@ import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.vector.ImageVector
 import androidx.compose.ui.unit.dp
-import dev.msfjarvis.claw.android.viewmodel.DataTransferRepository
+import java.io.InputStream
+import java.io.OutputStream
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.launch
 
@@ -34,14 +35,15 @@ private const val MIME_TYPE = "application/json"
 @Composable
 fun DataTransferScreen(
   context: Context,
-  dataTransferRepository: DataTransferRepository,
+  importPosts: suspend (InputStream) -> Unit,
+  exportPosts: suspend (OutputStream) -> Unit,
   snackbarHostState: SnackbarHostState,
   modifier: Modifier = Modifier,
 ) {
   val coroutineScope = rememberCoroutineScope()
   Column(modifier = modifier) {
-    ImportOption(context, coroutineScope, dataTransferRepository, snackbarHostState)
-    ExportOption(context, coroutineScope, dataTransferRepository, snackbarHostState)
+    ImportOption(context, coroutineScope, importPosts, snackbarHostState)
+    ExportOption(context, coroutineScope, exportPosts, snackbarHostState)
   }
 }
 
@@ -49,7 +51,7 @@ fun DataTransferScreen(
 private fun ImportOption(
   context: Context,
   coroutineScope: CoroutineScope,
-  dataTransferRepository: DataTransferRepository,
+  importPosts: suspend (InputStream) -> Unit,
   snackbarHostState: SnackbarHostState,
 ) {
   val importAction =
@@ -60,7 +62,7 @@ private fun ImportOption(
       }
       coroutineScope.launch {
         context.contentResolver.openInputStream(uri)?.use { stream ->
-          dataTransferRepository.importPosts(stream)
+          importPosts(stream)
           snackbarHostState.showSnackbarDismissing("Successfully imported posts")
         }
       }
@@ -78,7 +80,7 @@ private fun ImportOption(
 private fun ExportOption(
   context: Context,
   coroutineScope: CoroutineScope,
-  dataTransferRepository: DataTransferRepository,
+  exportPosts: suspend (OutputStream) -> Unit,
   snackbarHostState: SnackbarHostState,
 ) {
   val exportAction =
@@ -89,7 +91,7 @@ private fun ExportOption(
       }
       coroutineScope.launch {
         context.contentResolver.openOutputStream(uri)?.use { stream ->
-          dataTransferRepository.exportPosts(stream)
+          exportPosts(stream)
           snackbarHostState.showSnackbarDismissing("Successfully exported posts")
         }
       }

android/src/main/kotlin/dev/msfjarvis/claw/android/viewmodel/ClawViewModel.kt

@@ -21,6 +21,8 @@ import dev.msfjarvis.claw.core.injection.IODispatcher
 import dev.msfjarvis.claw.database.local.SavedPost
 import dev.msfjarvis.claw.model.Comment
 import java.io.IOException
+import java.io.InputStream
+import java.io.OutputStream
 import java.net.HttpURLConnection
 import java.time.LocalDateTime
 import java.time.Month
@@ -42,7 +44,7 @@ constructor(
   private val savedPostsRepository: SavedPostsRepository,
   private val commentsRepository: CommentsRepository,
   private val linkMetadataRepository: LinkMetadataRepository,
-  val dataTransferRepository: DataTransferRepository,
+  private val dataTransferRepository: DataTransferRepository,
   private val pagingSourceFactory: LobstersPagingSource.Factory,
   @IODispatcher private val ioDispatcher: CoroutineDispatcher,
 ) : ViewModel() {
@@ -124,6 +126,10 @@ constructor(
       }
     }
 
+  suspend fun importPosts(input: InputStream) = dataTransferRepository.importPosts(input)
+
+  suspend fun exportPosts(output: OutputStream) = dataTransferRepository.exportPosts(output)
+
   /**
    * Parses a given [String] into a [LocalDateTime]. This method is only intended to be used for
    * dates in the format returned by the Lobsters API, and is not a general purpose parsing