Use @Throws(MXCryptoError::class)

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

@@ -661,6 +661,7 @@ internal class DefaultCryptoService @Inject constructor(
      * @param timeline the id of the timeline where the event is decrypted. It is used to prevent replay attack.
      * @return the MXEventDecryptionResult data, or null in case of error
      */
+    @Throws(MXCryptoError::class)
     private fun internalDecryptEvent(event: Event, timeline: String): MXEventDecryptionResult {
         val eventContent = event.content
         if (eventContent == null) {

matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/crypto/MXOlmDevice.kt

@@ -625,6 +625,7 @@ internal class MXOlmDevice @Inject constructor(
      * @param senderKey the base64-encoded curve25519 key of the sender.
      * @return the decrypting result. Nil if the sessionId is unknown.
      */
+    @Throws(MXCryptoError::class)
     fun decryptGroupMessage(body: String,
                             roomId: String,
                             timeline: String?,
@@ -662,8 +663,7 @@ internal class MXOlmDevice @Inject constructor(
                 adapter.fromJson(payloadString)
             } catch (e: Exception) {
                 Timber.e("## decryptGroupMessage() : fails to parse the payload")
-                throw
+                throw MXCryptoError.Base(MXCryptoError.ErrorType.BAD_DECRYPTED_FORMAT, MXCryptoError.BAD_DECRYPTED_FORMAT_TEXT_REASON)
-                MXCryptoError.Base(MXCryptoError.ErrorType.BAD_DECRYPTED_FORMAT, MXCryptoError.BAD_DECRYPTED_FORMAT_TEXT_REASON)
             }
 
             return OlmDecryptionResult(

matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/crypto/algorithms/IMXDecrypting.kt

@@ -17,6 +17,7 @@
 
 package im.vector.matrix.android.internal.crypto.algorithms
 
+import im.vector.matrix.android.api.session.crypto.MXCryptoError
 import im.vector.matrix.android.api.session.events.model.Event
 import im.vector.matrix.android.internal.crypto.IncomingRoomKeyRequest
 import im.vector.matrix.android.internal.crypto.IncomingSecretShareRequest
@@ -35,6 +36,7 @@ internal interface IMXDecrypting {
      * @param timeline the id of the timeline where the event is decrypted. It is used to prevent replay attack.
      * @return the decryption information, or an error
      */
+    @Throws(MXCryptoError::class)
     fun decryptEvent(event: Event, timeline: String): MXEventDecryptionResult
 
     /**

matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/crypto/algorithms/megolm/MXMegolmDecryption.kt

@@ -63,6 +63,7 @@ internal class MXMegolmDecryption(private val userId: String,
      */
     private var pendingEvents: MutableMap<String /* senderKey|sessionId */, MutableMap<String /* timelineId */, MutableList<Event>>> = HashMap()
 
+    @Throws(MXCryptoError::class)
     override fun decryptEvent(event: Event, timeline: String): MXEventDecryptionResult {
         // If cross signing is enabled, we don't send request until the keys are trusted
         // There could be a race effect here when xsigning is enabled, we should ensure that keys was downloaded once
@@ -70,6 +71,7 @@ internal class MXMegolmDecryption(private val userId: String,
         return decryptEvent(event, timeline, requestOnFail)
     }
 
+    @Throws(MXCryptoError::class)
     private fun decryptEvent(event: Event, timeline: String, requestKeysOnFail: Boolean): MXEventDecryptionResult {
         if (event.roomId.isNullOrBlank()) {
             throw MXCryptoError.Base(MXCryptoError.ErrorType.MISSING_FIELDS, MXCryptoError.MISSING_FIELDS_REASON)

matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/crypto/algorithms/olm/MXOlmDecryption.kt

@@ -38,6 +38,7 @@ internal class MXOlmDecryption(
         private val userId: String)
     : IMXDecrypting {
 
+    @Throws(MXCryptoError::class)
     override fun decryptEvent(event: Event, timeline: String): MXEventDecryptionResult {
         val olmEventContent = event.content.toModel<OlmEventContent>() ?: run {
             Timber.e("## decryptEvent() : bad event format")

matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/crypto/model/rest/DummyContent.kt

@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2020 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package im.vector.matrix.android.internal.crypto.model.rest
+
+/**
+ * Class representing the dummy content
+ * Ref: https://matrix.org/docs/spec/client_server/latest#id82
+ */
+typealias DummyContent = Unit