tauri-plugin-auth/android/src/main/java/AuthPlugin.kt

package com.plugin.auth

import android.app.Activity
import android.content.Context
import android.util.Base64
import androidx.credentials.ClearCredentialStateRequest
import androidx.credentials.CredentialManager
import androidx.credentials.CustomCredential
import androidx.credentials.GetCredentialRequest
import androidx.credentials.GetCredentialResponse
import androidx.credentials.exceptions.ClearCredentialException
import androidx.credentials.exceptions.GetCredentialException
import androidx.credentials.exceptions.NoCredentialException
import com.google.android.libraries.identity.googleid.GetGoogleIdOption
import com.google.android.libraries.identity.googleid.GoogleIdTokenCredential
import com.google.android.libraries.identity.googleid.GoogleIdTokenParsingException
import app.tauri.annotation.Command
import app.tauri.annotation.InvokeArg
import app.tauri.annotation.TauriPlugin
import app.tauri.plugin.Invoke
import app.tauri.plugin.JSObject
import app.tauri.plugin.Plugin
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.launch
import java.security.SecureRandom


@InvokeArg
class KirimArgs {
    var idKlien: String? = null
}

@TauriPlugin
class BluclasPlugin(private val activity: Activity) : Plugin(activity) {
    private val credentialManager by lazy { CredentialManager.create(activity) }
    private val scope = CoroutineScope(Dispatchers.Main)

    @Command
    fun masuk(invoke: Invoke) {
        val args = invoke.parseArgs(KirimArgs::class.java)
        val idKlien = args.idKlien
        if (idKlien.isNullOrEmpty()) {
            invoke.reject("ID Klien belum disediakan")
            return
        }

        val googleIdOption: GetGoogleIdOption = GetGoogleIdOption.Builder()
            .setFilterByAuthorizedAccounts(true)
            .setServerClientId(idKlien)
            .setNonce(generateSecureRandomNonce())
            .build()

        val request = GetCredentialRequest.Builder()
            .addCredentialOption(googleIdOption)
            .build()

        scope.launch {
            try {
                val result = credentialManager.getCredential(
                    request = request,
                    context = activity
                )
                handleSignInResult(result, invoke)
            } catch (e: NoCredentialException) {
                signInWithAllAccounts(idKlien, invoke)
            } catch (e: GetCredentialException) {
                invoke.reject("Gagal masuk: ${e.message}")
            }
        }
    }

    @Command
    fun keluar(invoke: Invoke) {
        scope.launch {
            try {
                credentialManager.clearCredentialState(ClearCredentialStateRequest())
                invoke.resolve()
            } catch (e: ClearCredentialException) {
                invoke.reject("Sign-out failed: ${e.message}")
            }
        }
    }

    private suspend fun signInWithAllAccounts(serverClientId: String, invoke: Invoke) {
        val googleIdOption = GetGoogleIdOption.Builder()
            .setFilterByAuthorizedAccounts(false)
            .setServerClientId(serverClientId)
            .setNonce(generateSecureRandomNonce())
            .build()

        val request = GetCredentialRequest.Builder()
            .addCredentialOption(googleIdOption)
            .build()

        try {
            val result = credentialManager.getCredential(
                request = request,
                context = activity
            )
            handleSignInResult(result, invoke)
        } catch (e: GetCredentialException) {
            invoke.reject("Sign-in failed: ${e.message}")
        }
    }

    private fun generateSecureRandomNonce(byteLength: Int = 32): String {
        val randomBytes = ByteArray(byteLength)
        SecureRandom().nextBytes(randomBytes)
        return Base64.encodeToString(randomBytes, Base64.NO_WRAP or Base64.URL_SAFE or Base64.NO_PADDING)
    }

    private fun handleSignInResult(result: GetCredentialResponse, invoke: Invoke) {
        val credential = result.credential

        when (credential) {
            is CustomCredential -> {
                if (credential.type == GoogleIdTokenCredential.TYPE_GOOGLE_ID_TOKEN_CREDENTIAL) {
                    try {
                        val googleIdTokenCredential =
                            GoogleIdTokenCredential.createFrom(credential.data)

                        // NOTE: do not treat the user as signed in on the client
                        // alone — send idToken to your backend and verify it there
                        // before trusting it.
                        val ret = JSObject()
                        ret.put("idToken", googleIdTokenCredential.idToken)
                        ret.put("id", googleIdTokenCredential.id)
                        ret.put("displayName", googleIdTokenCredential.displayName)
                        ret.put("givenName", googleIdTokenCredential.givenName)
                        ret.put("familyName", googleIdTokenCredential.familyName)
                        ret.put(
                            "profilePictureUri",
                            googleIdTokenCredential.profilePictureUri?.toString()
                        )
                        ret.put("phoneNumber", googleIdTokenCredential.phoneNumber)

                        invoke.resolve(ret)
                    } catch (e: GoogleIdTokenParsingException) {
                        invoke.reject("Invalid Google ID token response: ${e.message}")
                    }
                } else {
                    invoke.reject("Unexpected credential type: ${credential.type}")
                }
            }

            else -> {
                invoke.reject("Unexpected credential type")
            }
        }
    }
}