Native auth: Add new E2E test for authentication context MFA, Fixes A…

…B#3117220 (#2252)

Add new E2E test to check that MFA is triggered when authentication
context claim is specified during signIn.
Test check also that returned access token contains authentication
context claim (acrs).
This test is currently disabled cause the email OTP service issue.


[AB#3117220](https://identitydivision.visualstudio.com/Engineering/_workitems/edit/3117220)

msal/src/test/java/com/microsoft/identity/client/e2e/tests/network/nativeauth/SignInMFATest.kt

@@ -23,11 +23,13 @@
 
 package com.microsoft.identity.client.e2e.tests.network.nativeauth
 
+import com.microsoft.identity.client.claims.ClaimsRequest
 import com.microsoft.identity.client.e2e.utils.assertResult
 import com.microsoft.identity.internal.testutils.nativeauth.ConfigType
 import com.microsoft.identity.internal.testutils.nativeauth.api.TemporaryEmailService
 import com.microsoft.identity.internal.testutils.nativeauth.api.models.NativeAuthTestConfig
 import com.microsoft.identity.nativeauth.INativeAuthPublicClientApplication
+import com.microsoft.identity.nativeauth.parameters.NativeAuthSignInParameters
 import com.microsoft.identity.nativeauth.statemachine.errors.MFASubmitChallengeError
 import com.microsoft.identity.nativeauth.statemachine.results.GetAccessTokenResult
 import com.microsoft.identity.nativeauth.statemachine.results.MFARequiredResult
@@ -36,8 +38,10 @@ import kotlinx.coroutines.runBlocking
 import org.junit.Assert.assertEquals
 import org.junit.Assert.assertNotNull
 import org.junit.Assert.assertTrue
+import org.junit.Assert.fail
 import org.junit.Ignore
 import org.junit.Test
+import java.util.Base64
 
 class SignInMFATest : NativeAuthPublicClientApplicationAbstractTest() {
 
@@ -258,4 +262,72 @@ class SignInMFATest : NativeAuthPublicClientApplicationAbstractTest() {
             }
         }
     }
+
+    /**
+     * Full flow:
+     * - SignIn specifying authentication context as claim
+     * - Receive MFA required error from API.
+     * - Request default challenge.
+     * - Submit correct challenge.
+     * - Complete MFA flow and complete sign in.
+     * - Check that access token contains authentication context claim.
+     *
+     */
+    @Ignore("Retrieving OTP code failure and missing AC username")
+    @Test
+    fun `test MFA flow is triggered when authentication context is used as claim`() {
+        config = getConfig(ConfigType.SIGN_IN_MFA_SINGLE_AUTH)
+        application = setupPCA(config, defaultChallengeTypes)
+        resources = config.resources
+        val authenticationContextId = "c4"
+        val authenticationContextRequestClaimJson = "{\"access_token\":{\"acrs\":{\"essential\":true,\"value\":\"$authenticationContextId\"}}}"
+        val authenticationContextATClaimJson = "\"acrs\":[\"$authenticationContextId\"]"
+
+        retryOperation {
+            runBlocking {
+                val username = config.email
+                val password = getSafePassword()
+                val params = NativeAuthSignInParameters(username)
+                params.password = password.toCharArray()
+                params.claimsRequest = ClaimsRequest.getClaimsRequestFromJsonString(authenticationContextRequestClaimJson)
+
+                val result = application.signIn(params)
+                assertResult<SignInResult.MFARequired>(result)
+
+                // Initiate challenge, send code to email
+                val sendChallengeResult =
+                    (result as SignInResult.MFARequired).nextState.requestChallenge()
+                assertResult<MFARequiredResult.VerificationRequired>(sendChallengeResult)
+                (sendChallengeResult as MFARequiredResult.VerificationRequired)
+                assertNotNull(sendChallengeResult.sentTo)
+                assertNotNull(sendChallengeResult.codeLength)
+                assertNotNull(sendChallengeResult.channel)
+
+                // Retrieve challenge from mailbox and submit
+                val otp = tempEmailApi.retrieveCodeFromInbox(username)
+                val submitCorrectChallengeResult = sendChallengeResult.nextState.submitChallenge(otp)
+                assertResult<SignInResult.Complete>(submitCorrectChallengeResult)
+
+                // Retrieve access token
+                val accountState = (submitCorrectChallengeResult as SignInResult.Complete).resultValue
+                val getAccessTokenResult = accountState.getAccessToken()
+                assertResult<GetAccessTokenResult.Complete>(getAccessTokenResult)
+                val authResult = (getAccessTokenResult as GetAccessTokenResult.Complete).resultValue
+
+                // Check that AT contains authentication context claim
+                val atParts = authResult.accessToken.split(".")
+                if (atParts.size != 3) {
+                    fail("Invalid Access token received")
+                    return@runBlocking
+                }
+                val atBody = atParts[1]
+                val charset = charset("UTF-8")
+                val atDecoded = String(
+                    Base64.getUrlDecoder().decode(atBody.toByteArray(charset)),
+                    charset
+                )
+                assertTrue(atDecoded.contains(authenticationContextATClaimJson))
+            }
+        }
+    }
 }