shinyOAuth 0.4.0

• ‘mirai’ & async backend improvements:

  • Warnings and messages emitted in async workers (e.g., missing expires_in from token response) are now captured and re-emitted on the main process so they appear in the R console. This includes conditions from user-supplied trace_hook / audit_hook functions: warnings, messages, and errors (surfaced as warnings) all propagate back to the main thread. Replay can be disabled via options(shinyOAuth.replay_async_conditions = FALSE).
  • Async callback flow no longer serializes the full client object (including potentially non-serializable custom state_store / JWKS cache backends) into the worker context. The state_store (already consumed on the main thread) is replaced with a lightweight serializable dummy before dispatch. If the client still fails serialization, the flow falls back to synchronous execution with an explicit warning instead of an opaque runtime error.
  • Further reduced serialization overhead towards async workers by using certain functions from the package namespace directly.
  • Detect active daemons via mirai::daemons_set() instead of mirai::status(). Falls back to mirai::info() on older ‘mirai’ versions that lack mirai::daemons_set() (< 2.3.0).
  • Configurable per-task timeout via options(shinyOAuth.async_timeout) (milliseconds); timed-out ‘mirai’ tasks are automatically cancelled by the dispatcher. Default is NULL (no timeout).
  • Async audit events now include a mirai_error_type field. This classifies mirai transport-level failures separately from application-level errors.
  • Prevent ‘mirai’ warning spam about ‘stats’ maybe not being available in workers.

• ID token validation (validate_id_token()):

  • Now enforces RFC 7515 section 4.1.11 critical header parameter (crit) processing rules. Tokens containing unsupported critical extensions are rejected with a shinyOAuth_id_token_error. The current implementation supports no critical extensions, so any crit presence triggers rejection.
  • Now validates the at_hash (Access Token hash) claim when present in the ID token (per OIDC Core section 3.1.3.8 and 3.2.2.9). If the claim exists, the access token binding is verified; a mismatch raises a shinyOAuth_id_token_error. New id_token_at_hash_required property on OAuthProvider (default FALSE) forces login to fail when the ID token does not contain an at_hash claim.
  • Now validates, for refreshed ID tokens, per OIDC Core section 12.2, iss and aud claims against the original ID token’s values (not just the provider configuration) to cover edge cases with multi-tenant providers or rotating issuer URIs. Enforced in both validated and non-validated code paths.
  • Now detects encrypted ID tokens (JWE compact serialization, 5 dot-separated segments) early and raises a clear shinyOAuth_id_token_error instead of letting a confusing alg/typ/parse failure propagate.
  • Now validates the auth_time claim when max_age is present in extra_auth_params (OIDC Core section 3.1.2.1).
  • Now enforces a maximum ID token lifetime (exp - iat) per OIDC Core section 3.1.3.7; tokens with unreasonably long lifetimes are rejected with a shinyOAuth_id_token_error. Configure via options(shinyOAuth.max_id_token_lifetime = <seconds>) (default of 86400 which is 24 hours). Set to Inf to disable the check.

• Stricter state store usage:

  • custom_cache() gains an optional take parameter for atomic get-and-delete.
  • state_store_get_remove() prefers $take() when available; falls back to $get() + $remove() with a mandatory post-removal absence check (instead of trusting $remove() return values).
  • Non-cachem::cache_mem() stores without $take() now error by default to prevent TOCTOU replay attacks in shared/multi-worker deployments. To bypass this error, operators must explicitly acknowledge the risk by setting options(shinyOAuth.allow_non_atomic_state_store = TRUE), which downgrades the error to a warning.
  • OAuthClient validator now validates $take() signature when present.
  • The $remove() return value is no longer relied upon in the fallback path; the post-removal $get() absence check is authoritative.

• Stricter JWKS cache handling: JWKS cache key now includes host-policy fields (jwks_host_issuer_match, jwks_host_allow_only). Previously, two provider configs for the same issuer with different host policies shared the same cache entry, allowing a relaxed-policy provider to populate the cache and a strict-policy provider to skip host validation on cache hit. Cache entries now also store the JWKS source host and re-validate it against the current provider policy on read (defense-in-depth).

• Stricter URL validation: OAuthClient now rejects redirect URIs containing fragments (per RFC 6749, section 3.1.2); OAuthProvider now rejects issuer identifiers containing query or fragment components, covering both oauth_provider_oidc_discover() and manual construction of providers.

• Stricter state payload parsing: callback state now rejects embedded NUL bytes before JSON decoding.

• Stricter response size validation: enforce max response body size on all outbound HTTP endpoints (token, introspection, userinfo, OIDC discovery, JWKS). Curl aborts the transfer early when Content-Length exceeds the limit; a post-download guard catches chunked responses. Default 1 MiB, configurable via options(shinyOAuth.max_body_bytes).

• OAuthProvider (S7 class):

  • leeway validator now rejects non-finite values (Inf, -Inf, NaN). Previously these passed validation but were silently coerced to 0 at runtime, effectively disabling clock-skew tolerance.
  • Reserved OAuth parameter blocking in extra_auth_params and extra_token_params is now case-insensitive and trims whitespace.
  • Vector inputs for pkce_method and URL parameters (auth_url, token_url, userinfo_url, introspection_url, revocation_url) now produce clear scalar-input errors instead of cryptic coercion failures.

• OAuthClient (S7 class):

  • Gains a claims_validation property; when the client sends a structured claims request parameter with essential = TRUE entries, this setting controls whether the returned ID token and/or userinfo response are checked for those essential claims (similar to scope_validation).
  • Gains a required_acr_values property; enables client-side enforcement of the OIDC acr (Authentication Context Class Reference) claim.
  • extra_token_headers are now consistently applied to revoke and introspect requests, matching the existing behavior for token exchange and refresh. Previously, provider integrations requiring custom headers across all token endpoints could partially fail on revocation/introspection.
  • Fixed incorrect warning about client being created in Shiny when this was not the case.
  • Malformed client_assertion_alg and client_assertion_audience values (e.g., character(0), multi-element vectors) now produce clear validation errors instead of crashing with base R subscript-out-of-bounds errors. Empty string "" for client_assertion_audience is now explicitly rejected instead of being silently treated as “not provided”.

• OAuthToken (S7 class):

  • Gains a read-only id_token_claims property that exposes the decoded ID token JWT payload as a named list, surfacing all OIDC claims (e.g., acr, amr, auth_time) without manual decoding.
  • Gains an id_token_validated property (logical) indicating whether the ID token was cryptographically verified during the OAuth flow.

• oauth_module_server():

  • Now surfaces error_uri from provider error callbacks (RFC 6749, section 4.1.2.1). The new $error_uri reactive field contains the URI to a human-readable error page when the provider includes one; NULL otherwise. The error_uri callback parameter is also validated against a configurable size limit (e.g., options(shinyOAuth.callback_max_error_uri_bytes = 2048)).
  • OAuth callback query cleanup is now also applied in early return paths of internal function .process_query(), ensuring more consistent cleanup.
  • OAuth callback query size caps are now enforced even when the user is already authenticated. Previously, the “token already present” branch in .process_query() called .query_has_oauth_callback_keys() (which parses the query string) before any size validation, bypassing the intended DoS guardrails. The validate_untrusted_query_string() check now runs unconditionally at the top of .process_query().
  • OAuth callback error responses (?error=...) now require a valid state parameter. Missing/invalid/consumed state is then treated properly as an invalid_state error instead of surfacing the error from ?error=... (which could be set by an attacker).
  • OAuth callback including an iss query parameter now validate this against the provider’s configured/discovered issuer during callback processing (complementing the existing ID token iss claim validation that occurs post-exchange) (per RFC 9207). A mismatch produces an issuer_mismatch error and audit event, defending against authorization-server mix-up attacks in multi-provider scenarios. When iss is absent, current behavior is retained (no enforcement).

• handle_callback(): no longer accepts decrypted_payload and state_store_values bypass parameters. These parameters were only intended for internal use by oauth_module_server()’s async path. As they can be misused by direct/custom callers to bypass important security checks, they have been moved to an internal-only helper function (handle_callback_internal()).

• handle_callback()/refresh_token(): when a token response omits expires_in, a warning is now emitted once per phase (exchange_code / refresh_token) so operators know that proactive token refresh will not trigger. Users can now also set a finite default lifetime for such tokens via options(shinyOAuth.default_expires_in = <seconds>) (instead of the default of Inf).

• get_userinfo() now supports JWT-encoded userinfo responses per OIDC Core, section 5.3.2. When the endpoint returns Content-Type: application/jwt, the body is decoded as a JWT. Verification is fail-closed: signature verification is always performed against the provider JWKS using the provider’s allowed_algs, alg=none is always rejected, and unparseable headers, non-asymmetric algorithms, or missing issuer/JWKS infrastructure all raise errors. options(shinyOAuth.allow_unsigned_userinfo_jwt = TRUE) permits unsigned JWTs. New userinfo_signed_jwt_required property on OAuthProvider (default FALSE) mandates that the userinfo endpoint returns application/jwt content-type which is then subject to the above verification.

• client_bearer_req() now validates the target URL against is_ok_host() before attaching the Bearer token. Relative URLs, plain HTTP to non-loopback hosts, and hosts outside options(shinyOAuth.allowed_hosts) are rejected by default. A new check_url argument (default TRUE) allows opting out of the check when the URL has already been validated.

• err_http() now extracts RFC 6749 section 5.2 structured error fields (error, error_description, error_uri) from JSON error response bodies. These fields are surfaced in the error message bullets, attached to the condition object (as oauth_error, oauth_error_description, oauth_error_uri), and included in trace/audit events. This improves debugging of token endpoint failures (e.g. invalid_grant, invalid_client) without changing existing control flow.

• OIDC claims parameter support (OIDC Core, section 5.5): OAuthClient and oauth_client() now accept a claims argument to request specific claims from the userinfo Endpoint and/or in the ID token. Pass a list structure (automatically JSON-encoded) or a pre-encoded JSON string.

• OIDC openid scope enforcement: when a provider has an issuer set (indicating OIDC) and openid is missing from the client’s scopes, build_auth_url() now auto-prepends it and emits a one-time warning.

• OIDC discovery (oauth_provider_oidc_discover()) now prefers confidential auth methods (client_secret_basic, client_secret_post) over none when both are advertised in token_endpoint_auth_methods_supported. Previously, mixed metadata (e.g. none + client_secret_basic) with PKCE enabled would silently select the public-client posture ("body" without credentials).

• Scope validation now aligns with the RFC 6749, section 3.3 scope-token grammar (NQSCHAR = %x21 / %x23-5B / %x5D-7E). The previous regex rejected valid ASCII characters such as !, #, $, =, @, ~, and others. All printable ASCII except space, double-quote, and backslash is now accepted.

• JWT helpers (build_client_assertion(), resolve_client_assertion_audience()) now have defense-in-depth scalar guards so malformed property values cannot cause subscript errors at runtime.

• Audit events:

  • audit_token_refresh: replaced non-informative had_refresh_token field (always TRUE post-mutation) with refresh_token_rotated (indicates whether the provider returned a new refresh token).

shinyOAuth 0.3.0

• Async backend: the default async backend is now ‘mirai’ (>= 2.0.0) for simpler and more efficient asynchronous execution. Use mirai::daemons() to configure async workers. A ‘future’ backend configured with future::plan() is still supported, but ‘mirai’ takes precedence if both are configured.

• Test suite: fixed inconsistent results of several tests; tests not suitable for CRAN now skip on CRAN. Silenced test output messages to avoid confusion.

shinyOAuth 0.2.0

New/improved

Security

• Token revocation: tokens can now be revoked when Shiny session ends. Enable via revoke_on_session_end = TRUE in oauth_module_server(). The provider must expose a revocation_url (auto-discovered for OIDC, or set manually via oauth_provider()). New exported function revoke_token().

• Token introspection on login: validate tokens via the provider’s introspection endpoint during login. Configure via introspect and introspect_elements properties on OAuthClient. The provider must expose an introspection_url (auto-discovered for OIDC, or set manually via oauth_provider()).

• DoS protection: callback query parameters and state payload/browser token sizes are validated before expensive operations (e.g., hashing for audit logs). Maximum size may be configured via options(); see section ‘Size caps’ in vignette("usage", package = "shinyOAuth").

• DoS protection: rate-limited JWKS refresh: forced JWKS cache refreshes (triggered by unknown kid) are now rate-limited to prevent abuse.

• JWKS pinning: pinning is now enforced during signature verification: previously, jwks_pins with jwks_pin_mode = "any" only verified that at least one key in the JWKS matched a pin, but signature verification could still use any matching key (pinned or not). Now, signature verification is restricted to only use keys whose thumbprints appear in the pin list, ensuring true key pinning rather than presence-only checks.

• use_shinyOAuth() now injects <meta name="referrer" content="no-referrer"> by default to reduce leaking ?code=…&state=… via the Referer header on the callback page. Can be disabled with use_shinyOAuth(inject_referrer_meta = FALSE).

• Sensitive outbound HTTP requests (token exchange/refresh, introspection, revocation, userinfo, OIDC discovery, JWKS) now by default disable redirect following and reject 3xx responses to prevent bypassing host/HTTPS policies. Configurable via options(shinyOAuth.allow_redirect = TRUE). client_bearer_req() also gains follow_redirect, which defaults to FALSE, to similarly control redirect behavior for requests using bearer tokens.

• State is now also consumed in login failure paths (when the provider returns an error but also a state).

• Callback URL parameters are now also cleared in login failure paths.

• OAuthProvider now requires absolute URLs (scheme + hostname) for all endpoint URLs.

• Provider fingerprint now includes userinfo_url and introspection_url, reducing risk of misconfiguration when multiple providers share endpoints.

• state_payload_max_age property on OAuthClient for independent freshness validation of the state payload’s issued_at timestamp.

• Default client assertion JWT TTL reduced from 5 minutes to 120 seconds, reducing the window for replay attacks while allowing for clock skew.

Auditing

• New audit events: session_ended (logged on Shiny session close), authenticated_changed (logged when authentication status changes), token_introspection (when introspect_token() is used), token_revocation (when revoke_token() is used), error_state_consumed and error_state_consumption_failed (called when provider returns an error during callback handling and the state is attempted to be consumed).

• All audit events now include $process_id, $is_async, and $main_process_id (if called from an async worker); these fields help identify which process generated the event and whether it was from an async worker. Async workers now also properly propagate audit hooks from the main process (see ‘Fixed’).

• Audit event login_success now includes sub_source to indicate whether the subject digest came from userinfo, id_token (verified), or id_token_unverified.

• Audit digest keying: audit/event digests (e.g., sub_digest, browser_token_digest) now default to HMAC-SHA256 with an auto-generated per-process key to reduce reidentification/correlation risk if logs leak. Configure a key with options(shinyOAuth.audit_digest_key = "..."), or disable keying (legacy deterministic SHA-256) with options(shinyOAuth.audit_digest_key = FALSE).

• HTTP log sanitization: sensitive data in HTTP contexts (headers, cookies) is now sanitized by default in audit logs. Can be disabled with options(shinyOAuth.audit_redact_http = FALSE). Use options(shinyOAuth.audit_include_http = FALSE) to not include any HTTP data in logs.

UX

• Configurable scope validation: validate_scopes property on OAuthClient controls whether returned scopes are validated against requested scopes ("strict", "warn", or "none"). Scopes are now normalized (alphabetically sorted) before comparison.

• OAuthProvider: extra parameters are now blocked from overriding reserved keys essential for the OAuth 2.0/OIDC flow. Reserved keys may be explicitly overridden via options(shinyOAuth.unblock_auth_params = c(...), shinyOAuth.unblock_token_params = c(...), shinyOAuth.unblock_token_headers = c(...)). It is also validated early that all parameters are named, catching configuration errors sooner.

• Added warning about negative expires_in values in token responses.

• Added warning when OAuthClient is instantiated inside a Shiny session; may cause sealed state payload decryption to fail when random secret is generated upon client creation.

• Added hints in error messages when sealed state payload decryption fails.

• Ensured a clearer error message when token response is in unexpected format.

• Ensured a clearer error when retrieved state store entry is in unexpected format.

• Ensured a clearer error message when retrieved userinfo cannot be parsed as JSON.

• Immediate error when OAuthProvider uses HS* algorithm but options(shinyOAuth.allow_hs = TRUE) is not enabled; also immediate error when OAuthProvider uses HS* algorithm and ID token verification can happen but client_secret is absent or too weak.

• build_auth_url() now uses package-typed errors (err_invalid_state()) instead of generic stopifnot() assertions, ensuring consistent error handling and audit logging.

Other

• ID token signature/claims validation now occurs before fetching userinfo. This ensures cryptographic validation passes before making external calls to the userinfo endpoint.

• When fetching JWKS, if key_ops is present on keys, only keys with key_ops including "verify" are considered.

• oauth_provider() now defaults allowed_token_types to c("Bearer") for all providers. This prevents accidentally misusing non-Bearer tokens (e.g., DPoP, MAC) as Bearer tokens. Set allowed_token_types = character() to opt out. Token type is also now validated before calling the userinfo endpoint.

• client_assertion_audience property on OAuthClient allows overriding the JWT audience claim for client assertion authentication.

Fixed

• Package now correctly requires httr2 >= 1.1.0.

• authenticated now flips to FALSE promptly when a token expires or reauth_after_seconds elapses, even without other reactive changes. Previously, the value could remain TRUE past expiry until an unrelated reactive update triggered re-evaluation.

• HTTP error responses (4xx/5xx) are now correctly returned to the caller immediately instead of being misclassified as transport errors and retried.

• Async worker options propagation: all R options are now automatically propagated to async workers when using async = TRUE. Previously, options set in the main process (including audit_hook, trace_hook, HTTP settings, and any custom options) were not available in future::multisession workers.

• oauth_provider_microsoft(): fixed incorrect default which blocked multi-tenant configuration.

• oauth_provider_oidc_discover(): stricter host matching; ? and * wildcards now correctly handled.

• Fixed potential auto-redirect loop after authentication error has surfaced.

• Fixed potential race condition between proactive refresh and expiry watcher: the expiry watcher now defers clearing the token and triggering reauthentication while a refresh is in progress.

• Token expiry handling during token refresh now aligns with how it is handled during login.

• State payload issued_at validation now applies clock drift leeway (from OAuthProvider@leeway / shinyOAuth.leeway option), consistent with ID token iat check.

shinyOAuth 0.1.4

• Added a console warning about needing to access Shiny apps with oauth_module_server() in a regular browser; also updated examples and vignettes to further clarify this.

• oauth_module_server(): improved formatting style of warning messages (now consistent with error messages).

shinyOAuth 0.1.3

• Rewrote vignette("authentication-flow") to improve clarity.

• Skip timing-sensitive tests on CRAN.

shinyOAuth 0.1.1

• Initial CRAN submission.