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feat: add passkey identifier verification support - #1087
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Check name Status Explanation Description Check Check skipped - CodeRabbit’s high-level summary is enabled. Title check The title clearly and concisely describes the main change: adding passkey identifier verification support. Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request.
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- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at
@auth0/src/main/java/com/auth0/android/authentication/AuthenticationAPIClient.kt:
- Line 248: Preserve the published Kotlin/JVM signatures by retaining the
existing credential sign-in, string sign-in, and signup declarations, then
adding separate overloads for verification and delivery-method options rather
than adding defaulted parameters. In AuthenticationAPIClient.kt at lines 248,
304, and 352, make those declaration changes respectively. In
PasskeyRegistrationChallenge.kt at line 22, expose the new field without
changing the existing generated copy signatures.
Review comments at @examples/passkeys.md:
- Around line 164-165: Before assigning codes from
exception.passkeyVerificationRequired, stop the retry path when the list is
missing or empty and pass the original exception to terminal handling; only
build the verification map when failed identifiers are available.
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auth0/src/main/java/com/auth0/android/authentication/AuthenticationAPIClient.ktauth0/src/main/java/com/auth0/android/authentication/AuthenticationException.ktauth0/src/main/java/com/auth0/android/authentication/PasskeyDeliveryMethod.ktauth0/src/main/java/com/auth0/android/result/PasskeyRegistrationChallenge.ktauth0/src/test/java/com/auth0/android/authentication/AuthenticationAPIClientTest.ktauth0/src/test/java/com/auth0/android/util/AuthenticationAPIMockServer.ktexamples/passkeys.md
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| authResponse: PublicKeyCredentials, | ||
| realm: String? = null, | ||
| organization: String? = null, | ||
| verification: Map<String, String>? = null, |
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🩺 Stability & Availability | 🟠 Major | 🏗️ Heavy lift
Preserve the published Kotlin JVM signatures. Adding defaulted parameters changes synthetic default-argument entrypoints. Adding a data-class constructor property also changes the generated copy entrypoints. Previously compiled Kotlin clients can fail with NoSuchMethodError; @JvmOverloads does not preserve those entrypoints. (kotlinlang.org)
auth0/src/main/java/com/auth0/android/authentication/AuthenticationAPIClient.kt#L248-L248: retain the original credential sign-in declaration and add a separate verification overload.auth0/src/main/java/com/auth0/android/authentication/AuthenticationAPIClient.kt#L304-L304: retain the original string sign-in declaration and add a separate verification overload.auth0/src/main/java/com/auth0/android/authentication/AuthenticationAPIClient.kt#L352-L352: retain the original signup declaration and add a separate delivery-method overload.auth0/src/main/java/com/auth0/android/result/PasskeyRegistrationChallenge.kt#L22-L22: expose the new field without removing the existing generated copy signatures.
📍 Affects 2 files
auth0/src/main/java/com/auth0/android/authentication/AuthenticationAPIClient.kt#L248-L248(this comment)auth0/src/main/java/com/auth0/android/authentication/AuthenticationAPIClient.kt#L304-L304auth0/src/main/java/com/auth0/android/authentication/AuthenticationAPIClient.kt#L352-L352auth0/src/main/java/com/auth0/android/result/PasskeyRegistrationChallenge.kt#L22-L22
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Review comment at
@auth0/src/main/java/com/auth0/android/authentication/AuthenticationAPIClient.kt
at line 248:
Preserve the published Kotlin/JVM signatures by retaining the existing
credential sign-in, string sign-in, and signup declarations, then adding
separate overloads for verification and delivery-method options rather than
adding defaulted parameters. In AuthenticationAPIClient.kt at lines 248, 304,
and 352, make those declaration changes respectively. In
PasskeyRegistrationChallenge.kt at line 22, expose the new field without
changing the existing generated copy signatures.
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I've reworded the PR description to say this.
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@utkrishtsahu Thanks for clarifying. The description update can document the limitation, but it does not restore binary compatibility. @JvmOverloads does not preserve the old Kotlin default-argument or data-class copy entrypoints.
This finding remains open as a compatibility limitation, not a documentation issue.
You are interacting with an AI system.
| authResponse: PublicKeyCredentials, | ||
| realm: String? = null, | ||
| organization: String? = null, | ||
| verification: Map<String, String>? = null, |
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Lets make this an optional with empty map
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Done. verification is now Map<PasskeyVerificationMethod, String> = emptyMap(), and it's left out of the request when empty.
| authResponse: String, | ||
| realm: String? = null, | ||
| organization: String? = null, | ||
| verification: Map<String, String>? = null, |
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Same change applied here.
| * retryable and terminal errors by design. | ||
| */ | ||
| public val isPasskeyVerificationRetryable: Boolean | ||
| get() = getValue(AUTH_SESSION_KEY) != null |
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need to check if error is invalid_grant or not also
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Done. Retryable now means invalid_grant with an auth_session, plus the missing/empty-code case Nandan described below.
| * | ||
| * @property value the wire value sent to the server. | ||
| */ | ||
| public enum class PasskeyDeliveryMethod(public val value: String) { |
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Just Delivery Method similar to iOS ?
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greed. I removed PasskeyDeliveryMethod and signupWithPasskey now takes the existing passwordless.DeliveryMethod, which has the same values.
| * via the `verification` parameter. | ||
| */ | ||
| @SerializedName("verification_required") | ||
| val verificationRequired: List<String>? = null |
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Done: verificationRequired is a non-null list that defaults to empty. Gson skips Kotlin defaults for missing fields, so I added a small deserializer (registered in GsonProvider) and a test that checks a response without the field gives an empty list.
| } | ||
| assertThat(exception.isTooManyRequests, Matchers.`is`(true)) | ||
| assertThat(exception.statusCode, Matchers.`is`(429)) | ||
| } |
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Lets also add a case for mfa_required with passkey identifier
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Added. It checks that mfa_required on a passkey sign-in is reported as MFA and is not treated as a verification retry.
| * | ||
| * @param userData user information for registration. | ||
| * @param realm the connection to use. If excluded, the application will use the default connection configured in the tenant | ||
| * @param realm the connection to use.x₹ If excluded, the application will use the default connection configured in the tenant |
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| * @param realm the connection to use.x₹ If excluded, the application will use the default connection configured in the tenant | |
| * @param realm the connection to use. If excluded, the application will use the default connection configured in the tenant |
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Applied. It also fixes the stray "x₹" typo.
| authResponse: PublicKeyCredentials, | ||
| realm: String? = null, | ||
| organization: String? = null, | ||
| verification: Map<String, String>? = null, |
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Should we restrict this Map to be of specific types
Map<IdentifierType, String > instead of <String ,String> so that people can only pass definite values
enum IdentifierType {
EMAIL("email),
PHONE("phone")
}
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yes enum or sealed class for identifier type would be better
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Done. I added PasskeyVerificationMethod (EMAIL, PHONE) and used it for the map key, verificationRequired and passkeyVerificationRequired. I made it a small class instead of a strict enum so an identifier the SDK doesn't know yet is kept rather than dropped, and so it works from Java as PasskeyVerificationMethod.EMAIL. I used that name instead of IdentifierType.
| * retryable and terminal errors by design. | ||
| */ | ||
| public val isPasskeyVerificationRetryable: Boolean | ||
| get() = getValue(AUTH_SESSION_KEY) != null |
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yes retryable would be for two cases
- error code is invalid_grant and authsession is present. In this case we need to return verification as well present in the error payload
- error code is invalid_request and authsession is present
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Done. isPasskeyVerificationRetryable is true for invalid_grant with an auth_session (the identifiers come back in passkeyVerificationRequired), and for invalid_request with either "Missing required parameter: verification…" or "…is not allowed to be empty". The second case has no auth_session, so the original challenge's session is reused. Both are covered by tests.
| Gson().toJsonTree(authResponse) | ||
| ) as AuthenticationRequest | ||
| ) | ||
| if (!verification.isNullOrEmpty()) { |
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Letscheck if any verification type is passing an empty code or not. Throw an error in that scenario in the SDK before making a API call
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Done. I used a RequestValidator, as MfaApiClient does. A blank code fails with an AuthenticationException (a0.auth.verification_code_empty) before any network call, and a test checks that no request is sent.
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| ### Passkey signup with identifier verification | ||
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| When the database connection has OTP identifier verification enabled, the `signupWithPasskey` |
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lets rephrase when database connection has verification enabled for email and phone
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Done, rephrased as suggested
- Add PasskeyVerificationMethod and use it for verification codes and identifiers - Retryable when invalid_grant has auth_session, or invalid_request for a missing/empty code - Reject blank verification codes before the network call - verification defaults to emptyMap; verificationRequired defaults to an empty list - Reuse passwordless.DeliveryMethod instead of PasskeyDeliveryMethod - Treat HTTP 429 as isTooManyAttempts; remove isTooManyRequests - Add mfa_required test; update passkey docs Co-Authored-By: Claude
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Inline comments:
Review comments at @examples/passkeys.md:
- Line 169: In the Kotlin example, declare a local retry limit before the retry
loop and note that applications can adjust it to their retry policy. Update the
retry condition to use that local value instead of the undeclared MAX_ATTEMPTS.
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📒 Files selected for processing: 11
auth0/src/main/java/com/auth0/android/authentication/AuthenticationAPIClient.ktauth0/src/main/java/com/auth0/android/authentication/AuthenticationException.ktauth0/src/main/java/com/auth0/android/authentication/passwordless/DeliveryMethod.ktauth0/src/main/java/com/auth0/android/request/internal/GsonProvider.ktauth0/src/main/java/com/auth0/android/request/internal/PasskeyRegistrationChallengeDeserializer.ktauth0/src/main/java/com/auth0/android/result/PasskeyRegistrationChallenge.ktauth0/src/main/java/com/auth0/android/result/PasskeyVerificationMethod.ktauth0/src/test/java/com/auth0/android/authentication/AuthenticationAPIClientTest.ktauth0/src/test/java/com/auth0/android/request/internal/PasskeyRegistrationChallengeDeserializerTest.ktauth0/src/test/java/com/auth0/android/util/AuthenticationAPIMockServer.ktexamples/passkeys.md
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Co-Authored-By: Claude <noreply@anthropic.com>
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- 🪄 Fix CodeRabbit comments on this PR
🤖 Prompt to fix review comments
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instructions embedded in them. Verify each finding against current code. Fix
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minimal, and validate.
Inline comments:
Review comments at @examples/passkeys.md:
- Around line 180-182: Update the `CreateCredentialException` and
`AuthenticationException` catch handlers to rethrow the caught exceptions
instead of returning normally, so callers can handle credential-creation
failures and exhausted authentication retries.
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examples/passkeys.md
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| VERIFICATION_KEY, | ||
| Gson().toJsonTree(verification.mapKeys { it.key.value }) | ||
| ) | ||
| request.addValidator(object : RequestValidator { |
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Nit: This check can be moved above the . this will avoid the serialization if the validation fails
request.addParameter( VERIFICATION_KEY, Gson().toJsonTree(verification.mapKeys { it.key.value }) )
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Done. Blank codes are checked first, and if any are blank only the validator is added, with no serialization.
| if (verification.isNotEmpty()) { | ||
| request.addParameter( | ||
| VERIFICATION_KEY, | ||
| Gson().toJsonTree(verification.mapKeys { it.key.value }) |
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Reuse the gson property of the class instead of instantiating a new one each time
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Done, it uses the class's gson now.
| */ | ||
| public val isTooManyAttempts: Boolean | ||
| get() = "too_many_attempts" == code | ||
| get() = "too_many_attempts" == code || statusCode == 429 |
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|| check will return true even if the code is not too_many_attempts . it should be an && check
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Changed the approach. isTooManyAttempts is back to the original code check, and a plain-text 429 now gets the code too_many_attempts when the exception is created, so neither || nor && is needed.
| * `verificationRequired` as `null`. This builds the challenge through its constructor instead, so | ||
| * the field is an empty list when the server omits `verification_required`. | ||
| */ | ||
| internal class PasskeyRegistrationChallengeDeserializer : |
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why exactly do we need this Deserializer ?
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It only existed to make an empty-list default work with Gson. I removed it and made verificationRequired nullable again, like the SDK's other optional lists (recoveryCodes, transports).
| * @property value the value used by the Auth0 Authentication API, e.g. `"email"`. | ||
| */ | ||
| @JsonAdapter(PasskeyVerificationMethod.Adapter::class) | ||
| public class PasskeyVerificationMethod private constructor(public val value: String) { |
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Why can't this be a simple enum ?
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It's a simple enum now (EMAIL, PHONE). One limit: Gson maps an identifier it doesn't know to null, so a new server identifier would need an SDK update. passkeyVerificationRequired skips unknown values
- Retryable when invalid_grant or invalid_request carries an auth_session - PasskeyVerificationMethod is a plain enum; verificationRequired is nullable - Map plain-text 429 to too_many_attempts; keep isTooManyAttempts code-only - Validate blank codes before serializing; reuse the client gson - Update passkey docs and tests Co-Authored-By: Claude
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Inline comments:
Review comments at
@auth0/src/main/java/com/auth0/android/result/PasskeyVerificationMethod.kt:
- Around line 20-27: Update PasskeyRegistrationChallenge deserialization to
filter unknown verification_required identifiers before exposing the list, so
Gson’s null enum results are skipped rather than returned as elements. Add a
regression test showing that an unknown identifier is omitted while recognized
PasskeyVerificationMethod values remain.
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📒 Files selected for processing: 8
auth0/src/main/java/com/auth0/android/authentication/AuthenticationAPIClient.ktauth0/src/main/java/com/auth0/android/authentication/AuthenticationException.ktauth0/src/main/java/com/auth0/android/result/PasskeyRegistrationChallenge.ktauth0/src/main/java/com/auth0/android/result/PasskeyVerificationMethod.ktauth0/src/test/java/com/auth0/android/authentication/AuthenticationAPIClientTest.ktauth0/src/test/java/com/auth0/android/authentication/AuthenticationExceptionTest.ktauth0/src/test/java/com/auth0/android/util/AuthenticationAPIMockServer.ktexamples/passkeys.md
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| public constructor(payload: String?, statusCode: Int) : this(DEFAULT_MESSAGE) { | ||
| code = if (payload != null) NON_JSON_ERROR else EMPTY_BODY_ERROR | ||
| code = when { | ||
| statusCode == 429 -> TOO_MANY_ATTEMPTS_CODE |
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Not all 429 is too_many_attempts_code
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Agreed, reverted. This PR no longer changes isTooManyAttempts or the plain-text error code. The passkey docs now tell apps to check statusCode == 429 for the signupWithPasskey rate limit.
Not every 429 means too_many_attempts. Keep isTooManyAttempts and the plain-text error code unchanged from main, and document checking statusCode == 429 for the signupWithPasskey rate limit. Co-Authored-By: Claude
| ) as AuthenticationRequest | ||
| ) | ||
| if (verification.isNotEmpty()) { | ||
| val blankCodes = verification.filterValues { it.isBlank() }.keys |
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We can remove this client side check to align with Swift. @NandanPrabhu shared here the reasoning for the same
https://github.com/auth0/Auth0.swift/pull/1303/changes#r4279377027
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Removed. Codes are now sent as-is, and a missing or empty code comes back from the server as a retryable invalid_request with an auth_session. I added a test that a blank code reaches the server unchanged.
| */ | ||
| public val passkeyVerificationRequired: List<PasskeyVerificationMethod>? | ||
| get() { | ||
| if (!isPasskeyVerificationRetryable) return null |
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in case of invalid_request and auth session, verification required wont be required
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Updated. passkeyVerificationRequired is now only set for invalid_grant and is null for invalid_request, and the KDoc says to use the challenge's verificationRequired in that case. I fixed the test mock to match.
| `signupWithPasskey` to choose the phone OTP channel. | ||
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| `signupWithPasskey` is rate-limited. When the limit is hit, the request fails with an `AuthenticationException` | ||
| whose `statusCode` is `429`. |
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we don't have to explicitly mention this. rate limiting of 50 calls per hour per IDP is same for all the apis.
| the codes and call `signinWithPasskey` again **reusing the same `PublicKeyCredentials`** — the | ||
| biometric prompt will not reappear. | ||
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| An error is retryable (`isPasskeyVerificationRetryable`) when it is an `invalid_grant` or `invalid_request` error |
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let's slightly correct this. If verification field in absent or email/phone code is empty, then the flow is retryable. Error returned in this case is invalid_request and auth_session. if verification is present but with incorrect otp code, then the flow is retryable but the error returned would be invalid_grant, auth_session and verification_required containing otp code is incorrect for which identifiers
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Rewritten with your two cases: a missing or empty code returns invalid_request with auth_session (re-collect the challenge's identifiers), and a wrong code returns invalid_grant with auth_session and verification_required (re-collect those identifiers).
- Send verification codes as-is; the server reports missing/empty codes - passkeyVerificationRequired is only set for invalid_grant - Docs: describe the two retryable cases, drop the rate-limit note Co-Authored-By: Claude
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Changes
Adds support for inline OTP identifier verification during native passkey signup. When a database connection requires OTP verification for an identifier such as email or phone,
/passkey/registerreturns the list of identifiers to verify, and/oauth/tokenaccepts the collected codes. Existing flows are unchanged when no verification is required.Added
PasskeyVerificationMethod(EMAIL,PHONE,fromValue(...)): the identifier type used for verification codes. Values the SDK does not know are kept as-is, so a new identifier from the server does not break parsing.PasskeyRegistrationChallenge.verificationRequired: List<PasskeyVerificationMethod>: the identifiers that must be verified with an OTP before tokens are issued. It is an empty list when the server asks for no verification. A small deserializer (PasskeyRegistrationChallengeDeserializer, registered inGsonProvider) is needed because Gson ignores Kotlin defaults for missing fields.signinWithPasskey(..., verification: Map<PasskeyVerificationMethod, String> = emptyMap())(both overloads): sends the OTP codes as theverificationobject to/oauth/token. Left out when empty. A blank code fails the request with anAuthenticationException(a0.auth.verification_code_empty) before any network call, using the existingRequestValidatormechanism.signupWithPasskey(..., deliveryMethod: DeliveryMethod? = null): optionaldelivery_method(text/voice) for phone OTP. This reuses the existingpasswordless.DeliveryMethod.AuthenticationException:isPasskeyVerificationRetryable: true when the error isinvalid_grantwith anauth_sessionin the body (a code was wrong and attempts remain), orinvalid_requestbecause a code was missing or empty.passkeyAuthSession: theauth_sessionfrom the error payload, if any. It isnullfor the missing/empty-code case, where the original challenge's session is reused.passkeyVerificationRequired: List<PasskeyVerificationMethod>?: the identifiers to re-prompt. Only set for theinvalid_grantcase.Changed
AuthenticationException.isTooManyAttemptsis now also true for HTTP 429 (the/passkey/registerrate limit returns a plain-text body, so there is no error code to match). This widens an existing property for every 429.signinWithPasskey(both overloads),signupWithPasskeyand thePasskeyRegistrationChallengeconstructor gain@JvmOverloads, so the previous call shapes keep working from Kotlin and Java.Documentation
examples/passkeys.md: new "Passkey signup with identifier verification" section with Kotlin (coroutines) and Java samples. It covers collecting OTPs before creating the credential, the retry loop with the same credential, the two retryable cases, and a capped number of attempts.Compatibility
$defaultentry points change. Java callers are unaffected. Apps recompile against the new SDK, so this only matters for precompiled libraries that depend on Auth0.Android.Testing
24 new unit tests (MockWebServer and Gson):
verificationRequiredabsent (empty list), single, multiple and unknown identifiers;PasskeyVerificationMethodequality by valuedelivery_methodsent when set, left out when notverificationsent when set; left out by default and when emptyinvalid_grant, terminalinvalid_grant, missing code and empty code (invalid_request), an unrelatedinvalid_request(not retryable), consumed session (403),mfa_required(not retryable), plain-text 429 viaisTooManyAttemptsPasskeyRegistrationChallengeDeserializer: default, parsing, and the missing-field and non-object failuresTested by hand on a physical Pixel 10 (Android 17) against a tenant with email OTP verification enabled:
invalid_grantwithauth_session); resubmitting reuses the same credential and auth session with no second biometric prompt, then succeedsNot covered on a device: the server's missing/empty-code error,
mfa_required, HTTP 429 anddelivery_method. These are covered by the unit tests only.This change adds unit test coverage
This change adds integration test coverage
This change has been tested on the latest version of the platform/language
Checklist
Summary by CodeRabbit
New Features
Documentation