chore: respond to banner code review

sshlib/src/main/kotlin/org/connectbot/sshlib/client/SshConnection.kt

@@ -744,11 +744,7 @@ class SshConnection(
                 setMethodSpecificFields(noneAuth)
             }
 
-            var noneResult = channel.receive()
-            while (noneResult is InternalAuthResult.Banner) {
-                handler.onBanner(noneResult.message)
-                noneResult = channel.receive()
-            }
+            val noneResult = receiveAuthResult(channel, handler)
             if (noneResult is InternalAuthResult.Success) return PublicAuthResult.Success
             if (noneResult !is InternalAuthResult.Failure) return PublicAuthResult.Error("Unexpected response to 'none' auth: $noneResult")
 
@@ -823,12 +819,7 @@ class SshConnection(
             }
             setMethodSpecificFields(pubkeyAuth)
         }
-        var response = channel.receive()
-        while (response is InternalAuthResult.Banner) {
-            handler.onBanner(response.message)
-            response = channel.receive()
-        }
-        return response
+        return receiveAuthResult(channel, handler)
     }
 
     private suspend fun signPublicKey(
@@ -881,11 +872,7 @@ class SshConnection(
             }
         }
 
-        var response = channel.receive()
-        while (response is InternalAuthResult.Banner) {
-            handler.onBanner(response.message)
-            response = channel.receive()
-        }
+        val response = receiveAuthResult(channel, handler)
         return when (response) {
             is InternalAuthResult.Success -> true
             else -> false
@@ -965,11 +952,7 @@ class SshConnection(
             setMethodSpecificFields(passAuth)
         }
 
-        var response = channel.receive()
-        while (response is InternalAuthResult.Banner) {
-            handler.onBanner(response.message)
-            response = channel.receive()
-        }
+        val response = receiveAuthResult(channel, handler)
         return when (val result = response) {
             is InternalAuthResult.Success -> true
 
@@ -982,6 +965,18 @@ class SshConnection(
         }
     }
 
+    private suspend fun receiveAuthResult(
+        channel: Channel<InternalAuthResult>,
+        handler: AuthHandler,
+    ): InternalAuthResult {
+        var result = channel.receive()
+        while (result is InternalAuthResult.Banner) {
+            handler.onBanner(result.message)
+            result = channel.receive()
+        }
+        return result
+    }
+
     private suspend fun sendAuthRequest(
         username: String,
         method: String,

sshlib/src/test/kotlin/org/connectbot/sshlib/client/FakeSshServer.kt

@@ -549,28 +549,24 @@ class FakeSshServer(
         }
     }
 
-    fun sendUserauthBanner(message: String) {
-        scope.launch(coroutineContext) {
-            val banner = SshMsgUserauthBanner()
-            val utf8 = createUtf8String(message)
-            banner.setMessage(utf8)
-            banner.setLanguageTag(createByteString(ByteArray(0)))
-            banner._check()
-            writeMutex.withLock {
-                serverIo.writePacket(SshEnums.MessageType.SSH_MSG_USERAUTH_BANNER.id().toInt(), banner.toByteArray())
-            }
+    suspend fun sendUserauthBanner(message: String) {
+        val banner = SshMsgUserauthBanner()
+        val utf8 = createUtf8String(message)
+        banner.setMessage(utf8)
+        banner.setLanguageTag(createByteString(ByteArray(0)))
+        banner._check()
+        writeMutex.withLock {
+            serverIo.writePacket(SshEnums.MessageType.SSH_MSG_USERAUTH_BANNER.id().toInt(), banner.toByteArray())
         }
     }
 
-    fun sendUserauthFailure(allowedMethods: Set<String>, partialSuccess: Boolean) {
-        scope.launch(coroutineContext) {
-            val failure = SshMsgUserauthFailure()
-            failure.setValidAuthentications(createNameList(allowedMethods.joinToString(",")))
-            failure.setPartialSuccess(if (partialSuccess) 1 else 0)
-            failure._check()
-            writeMutex.withLock {
-                serverIo.writePacket(SshEnums.MessageType.SSH_MSG_USERAUTH_FAILURE.id().toInt(), failure.toByteArray())
-            }
+    suspend fun sendUserauthFailure(allowedMethods: Set<String>, partialSuccess: Boolean) {
+        val failure = SshMsgUserauthFailure()
+        failure.setValidAuthentications(createNameList(allowedMethods.joinToString(",")))
+        failure.setPartialSuccess(if (partialSuccess) 1 else 0)
+        failure._check()
+        writeMutex.withLock {
+            serverIo.writePacket(SshEnums.MessageType.SSH_MSG_USERAUTH_FAILURE.id().toInt(), failure.toByteArray())
         }
     }