Catch network errors during file downloading.

Fixes #1229

CHANGES.md

@@ -25,6 +25,7 @@ Bugfix 🐛:
  - Cross- Signing | After signin in new session, verification paper trail in DM is off (#1191)
  - Failed to encrypt message in room (message stays in red), [thanks to pwr22] (#925)
  - Cross-Signing | web <-> riotX After QR code scan, gossiping fails (#1210)
+ - Fix crash when trying to download file without internet connection (#1229)
 
 Translations 🗣:
  -

matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/DefaultFileService.kt

@@ -19,6 +19,7 @@ package im.vector.matrix.android.internal.session
 import android.os.Environment
 import arrow.core.Try
 import im.vector.matrix.android.api.MatrixCallback
+import im.vector.matrix.android.api.extensions.tryThis
 import im.vector.matrix.android.api.session.content.ContentUrlResolver
 import im.vector.matrix.android.api.session.file.FileService
 import im.vector.matrix.android.api.util.Cancelable
@@ -77,9 +78,10 @@ internal class DefaultFileService @Inject constructor(
                                 .url(resolvedUrl)
                                 .build()
 
-                        val response = okHttpClient.newCall(request).execute()
+                        val response = tryThis { okHttpClient.newCall(request).execute() } ?: return@flatMap Try.Failure(IOException())
                         var inputStream = response.body?.byteStream()
                         Timber.v("Response size ${response.body?.contentLength()} - Stream available: ${inputStream?.available()}")
+
                         if (!response.isSuccessful || inputStream == null) {
                             return@flatMap Try.Failure(IOException())
                         }