Merge pull request #7699 from vector-im/bugfix/hughns/qr-device-race

Author: hughns

changelog.d/7699.bugfix

@@ -0,0 +1 @@
+Fix E2EE set up failure whilst signing in using QR code

matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/rendezvous/Rendezvous.kt

@@ -35,7 +35,10 @@ import org.matrix.android.sdk.api.session.crypto.crosssigning.KEYBACKUP_SECRET_S
 import org.matrix.android.sdk.api.session.crypto.crosssigning.MASTER_KEY_SSSS_NAME
 import org.matrix.android.sdk.api.session.crypto.crosssigning.SELF_SIGNING_KEY_SSSS_NAME
 import org.matrix.android.sdk.api.session.crypto.crosssigning.USER_SIGNING_KEY_SSSS_NAME
+import org.matrix.android.sdk.api.session.crypto.model.CryptoDeviceInfo
+import org.matrix.android.sdk.api.session.crypto.model.MXUsersDevicesMap
 import org.matrix.android.sdk.api.util.MatrixJsonParser
+import org.matrix.android.sdk.api.util.awaitCallback
 import timber.log.Timber
 
 /**
@@ -147,6 +150,14 @@ class Rendezvous(
         val deviceKey = crypto.getMyDevice().fingerprint()
         send(Payload(PayloadType.PROGRESS, outcome = Outcome.SUCCESS, deviceId = deviceId, deviceKey = deviceKey))
 
+        try {
+            // explicitly download keys for ourself rather than racing with initial sync which might not complete in time
+            awaitCallback<MXUsersDevicesMap<CryptoDeviceInfo>> { crypto.downloadKeys(listOf(userId), false, it) }
+        } catch (e: Throwable) {
+            // log as warning and continue as initial sync might still complete
+            Timber.tag(TAG).w(e, "Failed to download keys for self")
+        }
+
         // await confirmation of verification
         val verificationResponse = receive()
         if (verificationResponse?.outcome == Outcome.VERIFIED) {