未经授权的错误：Firebase function 从 android 应用调用

Question

I have just started working with callable functions on firebase. I deployed a function that gives the response hello world. It worked fine when I tested it locally. Now I am trying to call it from android app. According to this document , these callable functions automatically pass the authentication data and deserialise the data to get the user id in the function. When I run as suggested in the document above, I get an Unauthenticated error. I have used google sign in using firebase auth in the app. I dont want to make it public and keep it private so only the users can send requests. Is there any way I could manually include authentication in the header of the request. Here is the code from the call

               sendmessage(string)
                        .addOnCompleteListener {
                            if (!it.isSuccessful){
                                val e= it.exception
                                if(e is FirebaseFunctionsException){
                                    val code =e.code
                                    val details = e.details
                                    Log.d("Firebase error",code.toString()+details.toString())
                                }
                          
                            }
                            else{
                                Log.d("result obtained",it.result.toString())
                            }
                        }

private fun sendmessage(question:String): Task<String> {
        val data = hashMapOf(
            "question" to question,
            "push" to true
        )

        return functions
            .getHttpsCallable("detectIntent")
            .call(data)
            .continueWith {
                val result=it.result?.data as String
                result
            }
    }

Answer 1

Callable functions don't provide any amount of control over what happens in the HTTP headers. Authentication is handled automatically, based on the state of the user signed in through Firebase Auth. If you're not getting an authenticated user in your function in context.auth , that means you made the request before sign-in was complete.