Keep service exception constructors after R8 minification

[ede-wolf-gls]

Describe the bug
With minification enabled, my app gets different exceptions when a user tries to login.

To Reproduce

• Rely on com.amazonaws.services.cognitoidentity.model.NotAuthorizedException for not authorized users
• Enable minification in android app
• app gets a different exception

Current workaround: I added

-keep class * extends com.amazonaws.AmazonServiceException { <init>(java.lang.String); }

in my proguard file.

Which AWS service(s) are affected?
Cognito
com.amazonaws:aws-android-sdk-cognitoidentityprovider:2.73.0

Expected behavior
Even with minification, the app should receive the same exception as without minification.

Screenshots

Environment Information (please complete the following information):

• AWS Android SDK Version: 2.73.0
• Device: Samsung Galaxy A40
• Android Version: 9
• Specific to simulators: No

[tylerjroach]

@ede-wolf-gls What error are you instead getting with minification? I've tried to replicate but haven't seen minification break exceptions I've checked against yet.

[ede-wolf-gls]

The stacktrace looks like this:

com.amazonaws.AmazonClientException: Unable to unmarshall error response (com.amazonaws.services.cognitoidentityprovider.model.NotAuthorizedException.<init> [class java.lang.String]). Response Code: 400, Response Text: Bad Request, Response Headers: {X-Android-Selected-Protocol=http/1.1, x-amzn-ErrorMessage=Incorrect username or password., Connection=keep-alive, x-amzn-ErrorType=NotAuthorizedException:, x-amzn-RequestId=<...>, X-Android-Response-Source=NETWORK 400, X-Android-Sent-Millis=1699609649248, Content-Length=79, X-Android-Received-Millis=1699609649348, Date=Fri, 10 Nov 2023 09:47:32 GMT, Content-Type=application/x-amz-json-1.1}
	 at com.amazonaws.http.AmazonHttpClient.handleErrorResponse(AmazonHttpClient.java:736)
	 at com.amazonaws.http.AmazonHttpClient.executeHelper(AmazonHttpClient.java:420)
	 at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:229)
	 at com.amazonaws.services.cognitoidentityprovider.AmazonCognitoIdentityProviderClient.invoke(AmazonCognitoIdentityProviderClient.java:6849)
	 at com.amazonaws.services.cognitoidentityprovider.AmazonCognitoIdentityProviderClient.respondToAuthChallenge(AmazonCognitoIdentityProviderClient.java:5313)
	 at com.amazonaws.mobileconnectors.cognitoidentityprovider.CognitoUser.respondToChallenge(CognitoUser.java:2924)
	 at com.amazonaws.mobileconnectors.cognitoidentityprovider.CognitoUser$24.run(CognitoUser.java:3003)
	 at com.amazonaws.mobileconnectors.cognitoidentityprovider.CognitoUser$7$1.run(CognitoUser.java:1172)
	 at java.lang.Thread.run(Thread.java:764)

Caused by:
java.lang.NoSuchMethodException: com.amazonaws.services.cognitoidentityprovider.model.NotAuthorizedException.<init> [class java.lang.String]
	 at java.lang.Class.getConstructor0(Class.java:2328)
	 at java.lang.Class.getConstructor(Class.java:1725)
	 at com.amazonaws.transform.AbstractErrorUnmarshaller.newException(AbstractErrorUnmarshaller.java:66)
	 at com.amazonaws.transform.JsonErrorUnmarshaller.unmarshall(JsonErrorUnmarshaller.java:53)
	 at com.amazonaws.services.cognitoidentityprovider.model.transform.NotAuthorizedExceptionUnmarshaller.unmarshall(NotAuthorizedExceptionUnmarshaller.java:37)
	 at com.amazonaws.http.JsonErrorResponseHandler.runErrorUnmarshallers(JsonErrorResponseHandler.java:98)
	 at com.amazonaws.http.JsonErrorResponseHandler.handle(JsonErrorResponseHandler.java:67)
	 at com.amazonaws.http.JsonErrorResponseHandler.handle(JsonErrorResponseHandler.java:35)
	 at com.amazonaws.http.AmazonHttpClient.handleErrorResponse(AmazonHttpClient.java:711)
	 at com.amazonaws.http.AmazonHttpClient.executeHelper(AmazonHttpClient.java:420)
	 at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:229)
	 at com.amazonaws.services.cognitoidentityprovider.AmazonCognitoIdentityProviderClient.invoke(AmazonCognitoIdentityProviderClient.java:6849)
	 at com.amazonaws.services.cognitoidentityprovider.AmazonCognitoIdentityProviderClient.respondToAuthChallenge(AmazonCognitoIdentityProviderClient.java:5313)
	 at com.amazonaws.mobileconnectors.cognitoidentityprovider.CognitoUser.respondToChallenge(CognitoUser.java:2924)
	 at com.amazonaws.mobileconnectors.cognitoidentityprovider.CognitoUser$24.run(CognitoUser.java:3003)
	 at com.amazonaws.mobileconnectors.cognitoidentityprovider.CognitoUser$7$1.run(CognitoUser.java:1172)
	 at java.lang.Thread.run(Thread.java:764)

[tylerjroach]

Thank you, will look to add the rule. In the meantime, please continue with the manual addition to your proguard config.