feat(19.4-01): neutral wristband resource default and OIDC provider docs

- DefaultOptions().Resource is empty; comments name the host application, no consuming application (folded todo) - Tests set an explicit neutral resource; TestDefaultOptionsResourceEmpty - wristband README: new summary, two flavours, OIDC usage, API reference, OIDC defaults, dependencies, testing; root README row matches - docs/services/oauth-server.md: OpenID Connect provider section; Resource described as required with an empty default - ExampleNewOIDCServer and the newOIDCServer docs region
2026-10-19 18:32:03 +02:00
parent e25e73378c
commit ddda59a12b
12 changed files with 274 additions and 66 deletions
--- a/modules/wristband/README.md
+++ b/modules/wristband/README.md
@@ -1,23 +1,26 @@
 # wristband

-An OAuth authorization server for MCP clients: RFC 8414 metadata, RFC 7591 dynamic client registration, the authorization-code flow with PKCE, consent operations and refresh-token rotation over application-supplied storage.
+An OAuth authorization server and OpenID Connect provider: RFC 8414 metadata, dynamic client registration, discovery, JWKS, id_token, userinfo, resumable consent and refresh-token rotation over application-supplied storage.

 `import "git.golem15.com/golem15/summercms/modules/wristband"`

-**Name:** The festival wristband that lets you in for the event; it issues OAuth access for MCP clients.
+**Name:** The festival wristband that lets you in for the event; it issues OAuth access for MCP clients and signs users in to other sites with OpenID Connect.

 ## Overview

-wristband implements the protocol side of an OAuth authorization server so an application can let MCP clients (AI assistants and connectors) act on behalf of its users. A `wristband.Server` provides ready-made `net/http` handlers for the metadata, authorize, token and registration endpoints, plus Go methods the application's own consent screen calls. Everything application-specific stays outside the package: persistence arrives through the `wristband.Backend` and `wristband.Tx` interfaces, access tokens are minted by the application's `wristband.AccessTokenIssuer`, and issuer, scopes and lifetimes come from `wristband.Options`. It imports no ORM and no application package. WinterCMS core has no counterpart.
+wristband implements the protocol side of an OAuth authorization server in two flavours that share one engine. The MCP flavour (`wristband.NewServer`) lets MCP clients (AI assistants and connectors) act on behalf of the application's users: metadata, registration, authorize and token handlers plus Go methods the application's own consent screen calls. The OpenID Connect flavour (`wristband.NewOIDCServer`) lets other sites sign users in with the application's accounts ("Login with ..."): discovery, JWKS, authorize with a resumable request and consent, a token endpoint that adds a signed `id_token`, and userinfo. It is wire-compatible with the PHP (WinterCMS) OpenID Connect provider it replaces, so existing relying parties switch without noticing.
+
+Both flavours reuse the same primitives: PKCE, SHA-256 hashing of every secret, constant-time comparison, random identifiers and the redirect writer. Everything application-specific stays outside the package. The MCP flavour gets storage through `wristband.Backend` and `wristband.Tx` and access tokens from the application's `wristband.AccessTokenIssuer`. The OIDC flavour gets storage through `wristband.OIDCBackend` and `wristband.OIDCTx`, signing keys through `wristband.KeyStore`, and the signed-in user, the consent and error pages and sign-out through `wristband.OIDCHost`. Issuer, scopes and lifetimes come from `wristband.Options` and `wristband.OIDCOptions`. It imports no ORM and no application package. WinterCMS core has no counterpart.

 ## Role in the framework

-A standalone protocol leaf: it imports no framework module and no ORM. The application supplies storage and token minting through interfaces. It is separate because OAuth is security code that should be reviewed on its own, and only applications that serve MCP clients need it.
+A standalone protocol leaf: it imports no framework module and no ORM. The application (or a shared plugin) supplies storage, keys and pages through interfaces. It is separate because OAuth and OpenID Connect are security code that should be reviewed on its own, and only applications that serve MCP clients or relying parties need it.

 Use cases:

 - Let AI assistants and MCP connectors act on behalf of the application's users.
 - Register clients dynamically and complete the authorization-code flow with PKCE.
+- Be the identity provider other sites use for "Login with ...", with consent, account switching, public or pairwise subjects and key rotation.
 - Rotate refresh tokens and drive the application's own consent screen.

 ## Features
@@ -82,16 +85,49 @@ func Approve(ctx context.Context, w http.ResponseWriter, srv *wristband.Server,
 }
 ```

+The OpenID Connect flavour is a second server on the same engine. The host (usually a shared plugin) implements `wristband.OIDCBackend`, `wristband.KeyStore` and `wristband.OIDCHost`, then mounts the handlers at the paths discovery advertises:
+
+```go
+func NewProvider(backend wristband.OIDCBackend, keys wristband.KeyStore, host wristband.OIDCHost) (*wristband.Server, error) {
+	opts := wristband.DefaultOptions()
+	opts.Issuer = "https://id.example.com"
+
+	oidc := wristband.DefaultOIDCOptions()
+	oidc.LoginURL = "/account/login" // anonymous users land here with ?redirect=<resume path>
+
+	srv := wristband.NewOIDCServer(opts, oidc)
+	if err := srv.SetOIDCBackend(backend, keys, host); err != nil {
+		return nil, err // nil argument, or called on an MCP server
+	}
+	return srv, nil
+}
+
+func ProviderRoutes(r pact.Router, srv *wristband.Server) {
+	r.GroupRaw("", nil, func(g pact.Router) {
+		g.Get("/.well-known/openid-configuration", srv.Discovery)
+		g.Get("/oauth/jwks", srv.JWKS)
+		g.Get("/oauth/authorize", srv.Authorize)  // start
+		g.Post("/oauth/authorize", srv.Authorize) // consent decision
+		g.Get("/oauth/authorize/resume/{request}", srv.Resume)
+		g.Post("/oauth/authorize/switch-account", srv.SwitchAccount)
+		g.Post("/oauth/token", srv.Token)
+		g.Get("/oauth/userinfo", srv.UserInfo)
+	})
+}
+```
+
+`wristband.OIDCHost.RenderConsent` receives a `wristband.ConsentView`; the page posts `request_id`, `consent_token` and `decision` (`allow` or anything else) back to `POST /oauth/authorize`, or `request_id` and `consent_token` to the switch-account route. A host whose consent page lives in its own frontend redirects there from `wristband.OIDCHost.RenderConsent` and finishes through `wristband.Server.ConsentRequest` and `wristband.Server.DecideConsent`.
+
 ## API reference

 | Identifier | Description |
 |------------|-------------|
-| `wristband.Server` | The authorization server; `wristband.NewServer` builds it from `wristband.Options`. |
+| `wristband.Server` | The authorization server; `wristband.NewServer` builds the MCP flavour from `wristband.Options`, `wristband.NewOIDCServer` the OpenID Connect flavour. |
 | `wristband.Server.SetBackend` | Attaches the application's store bundle; handlers that need storage return 500 until it is set. |
 | `wristband.Server.Metadata` | Handler for `GET /.well-known/oauth-authorization-server`. |
 | `wristband.Server.Register` | Handler for `POST /oauth/mcp/register` (RFC 7591). |
-| `wristband.Server.Authorize` | Handler for `GET /oauth/mcp/authorize`. |
-| `wristband.Server.Token` | Handler for `POST /oauth/mcp/token` (authorization code and refresh token grants). |
+| `wristband.Server.Authorize` | Handler for `GET /oauth/mcp/authorize`; on an OIDC server `GET /oauth/authorize` (start) and `POST /oauth/authorize` (consent decision). |
+| `wristband.Server.Token` | Handler for `POST /oauth/mcp/token` (authorization code and refresh token grants); on an OIDC server `POST /oauth/token` with an `id_token`. |
 | `wristband.Server.PendingRequest` | Returns a `wristband.PendingRequestView` for a user's pending request. |
 | `wristband.Server.IssueCode` | Grants consent and returns the redirect URL carrying the code. |
 | `wristband.Server.DenyPending` | Refuses consent and returns the `access_denied` redirect URL. |
@@ -157,12 +193,31 @@ wristband reads no config keys or environment variables; the application passes
 | `wristband.Options.DCRClientCap` | `200` |
 | `wristband.Options.DCRUnconsentedSweepAge` | 24 hours |
 | `wristband.Options.RegisterMaxBodyBytes` | 65536 |
+| `wristband.Options.Resource` | none (empty); set it to the URL of the resource your tokens are for |
 | `wristband.Options.PendingRequestTTL` | 10 minutes |
 | `wristband.Options.CodeTTL` | 10 minutes |
 | `wristband.Options.AccessTokenTTL` | 1 hour |
 | `wristband.Options.RefreshTokenTTL` | 30 days |

-Always set `wristband.Options.Issuer` and `wristband.Options.Resource` for your deployment.
+Always set `wristband.Options.Issuer` and `wristband.Options.Resource` for your deployment. While `wristband.Options.Resource` is empty, an MCP authorization request that sends `resource` is refused with `invalid_target`.
+
+`wristband.DefaultOIDCOptions` sets:
+
+| Field | Default |
+|-------|---------|
+| `wristband.OIDCOptions.LoginURL` | `/login` |
+| `wristband.OIDCOptions.IDTokenTTL` | 1 hour |
+| `wristband.OIDCOptions.AccessTokenTTL` | 1 hour |
+| `wristband.OIDCOptions.CodeTTL` | 60 seconds |
+| `wristband.OIDCOptions.AuthRequestTTL` | 10 minutes |
+| `wristband.OIDCOptions.RefreshEnabled` | `false` |
+| `wristband.OIDCOptions.RefreshTokenTTL` | 30 days |
+| `wristband.OIDCOptions.ScopesSupported` | `openid`, `profile`, `email` |
+| `wristband.OIDCOptions.ClaimsSupported` | `sub`, `name`, `picture`, `groups`, `communities`, `email`, `email_verified`, `iss`, `aud`, `exp`, `iat`, `nonce` |
+| `wristband.OIDCOptions.IdentityClaims` | `sub`, `name`, `picture`, `groups`, `communities`, `email`, `email_verified` |
+| `wristband.OIDCOptions.SubjectTypesSupported` | `public`, `pairwise` |
+| `wristband.OIDCOptions.ClientIDPrefix`, `wristband.OIDCOptions.ClientSecretPrefix` | `oas_`, `oas_cs_` |
+| `wristband.OIDCOptions.CodePrefix`, `wristband.OIDCOptions.AccessTokenPrefix`, `wristband.OIDCOptions.RefreshTokenPrefix` | `oas_ac_`, `oas_at_`, `oas_rt_` |

 ## Dependencies

@@ -176,4 +231,4 @@ Always set `wristband.Options.Issuer` and `wristband.Options.Resource` for your
 go test ./modules/wristband/...
 ```

-The tests use in-memory fakes for the stores and need no external services.
+The tests use in-memory fakes for the stores (MCP and OIDC) and need no external services. `TestOIDCTracerSmoke` drives a relying party end to end (discovery, JWKS, authorize, resume, consent, code exchange, id_token verification against the served JWKS, userinfo); the OIDC smoke tests cover authorize and consent, kind isolation, PHP redirect encoding, token errors and code replay, userinfo, mixed RS256 and ES256 key rings, pairwise subjects and opt-in refresh.
--- a/modules/wristband/authorize_test.go
+++ b/modules/wristband/authorize_test.go
@@ -91,7 +91,7 @@ func TestPhase8RedAuthorize(t *testing.T) {
 		"code_challenge_method": "S256",
 		"scope":                 "read write",
 		"state":                 "must-not-appear-on-our-url",
-		"resource":              "https://mcp.plytarium.com/mcp",
+		"resource":              "https://resource.example.test/mcp",
 	})
 	rec := httptest.NewRecorder()
 	srv.Authorize(rec, req)
@@ -100,8 +100,8 @@ func TestPhase8RedAuthorize(t *testing.T) {
 		t.Fatalf("PHASE8_RED:authorize: status = %d, want %d (body=%s)", rec.Code, http.StatusFound, rec.Body.String())
 	}
 	loc := rec.Header().Get("Location")
-	if !strings.HasPrefix(loc, "https://plytarium.com/connect?") {
-		t.Fatalf("PHASE8_RED:authorize: Location = %q, want prefix \"https://plytarium.com/connect?\"", loc)
+	if !strings.HasPrefix(loc, "https://issuer.example.test/connect?") {
+		t.Fatalf("PHASE8_RED:authorize: Location = %q, want prefix \"https://issuer.example.test/connect?\"", loc)
 	}
 	q := queryOf(t, loc)
 	if q["request"] == "" {
@@ -241,8 +241,8 @@ func TestAuthorizeUnsupportedResponseTypeRedirectsWithIssAndState(t *testing.T)
 	if q["error"] != "unsupported_response_type" {
 		t.Fatalf("error = %q, want unsupported_response_type", q["error"])
 	}
-	if q["iss"] != "https://plytarium.com" {
-		t.Fatalf("iss = %q, want https://plytarium.com", q["iss"])
+	if q["iss"] != "https://issuer.example.test" {
+		t.Fatalf("iss = %q, want https://issuer.example.test", q["iss"])
 	}
 	if q["state"] != "iss-state" {
 		t.Fatalf("state = %q, want iss-state", q["state"])
@@ -275,8 +275,8 @@ func TestPKCEChallengeMethodMustBeS256(t *testing.T) {
 	if q["state"] != state {
 		t.Fatalf("state = %q, want %q", q["state"], state)
 	}
-	if q["iss"] != "https://plytarium.com" {
-		t.Fatalf("iss = %q, want https://plytarium.com", q["iss"])
+	if q["iss"] != "https://issuer.example.test" {
+		t.Fatalf("iss = %q, want https://issuer.example.test", q["iss"])
 	}
 	if cc := rec.Header().Get("Cache-Control"); cc != "no-store, private" {
 		t.Fatalf("Cache-Control = %q, want no-store, private", cc)
@@ -333,7 +333,7 @@ func TestAuthorizeValidRequestRedirectsToConnectWithOpaqueHandleOnly(t *testing.
 		"code_challenge_method": "S256",
 		"scope":                 "read write",
 		"state":                 state,
-		"resource":              "https://mcp.plytarium.com/mcp",
+		"resource":              "https://resource.example.test/mcp",
 	})
 	rec := httptest.NewRecorder()
 	srv.Authorize(rec, req)
@@ -342,8 +342,8 @@ func TestAuthorizeValidRequestRedirectsToConnectWithOpaqueHandleOnly(t *testing.
 		t.Fatalf("status = %d, want %d (body=%s)", rec.Code, http.StatusFound, rec.Body.String())
 	}
 	loc := rec.Header().Get("Location")
-	if !strings.HasPrefix(loc, "https://plytarium.com/connect?") {
-		t.Fatalf("Location = %q, want prefix https://plytarium.com/connect?", loc)
+	if !strings.HasPrefix(loc, "https://issuer.example.test/connect?") {
+		t.Fatalf("Location = %q, want prefix https://issuer.example.test/connect?", loc)
 	}
 	q := queryOf(t, loc)
 	if q["request"] == "" {
@@ -400,8 +400,8 @@ func TestAuthorizeIssIsPresentOnEveryErrorRedirect(t *testing.T) {
 	rec := httptest.NewRecorder()
 	srv.Authorize(rec, req)
 	q := queryOf(t, rec.Header().Get("Location"))
-	if q["iss"] != "https://plytarium.com" {
-		t.Fatalf("iss = %q, want https://plytarium.com", q["iss"])
+	if q["iss"] != "https://issuer.example.test" {
+		t.Fatalf("iss = %q, want https://issuer.example.test", q["iss"])
 	}
 	if q["state"] != "iss-state" {
 		t.Fatalf("state = %q, want iss-state", q["state"])
@@ -597,8 +597,8 @@ func TestAuthorizeCeilingRejectsAiOnlyAsInvalidScopeOnTrustedRedirect(t *testing
 	if q["state"] != state {
 		t.Fatalf("state = %q, want %q", q["state"], state)
 	}
-	if q["iss"] != "https://plytarium.com" {
-		t.Fatalf("iss = %q, want https://plytarium.com", q["iss"])
+	if q["iss"] != "https://issuer.example.test" {
+		t.Fatalf("iss = %q, want https://issuer.example.test", q["iss"])
 	}
 	if got := pendingCount(backend); got != before {
 		t.Fatalf("pending rows = %d, want unchanged %d", got, before)
@@ -697,10 +697,10 @@ func TestOrderedRedirectQueryEncodingIsRFC3986(t *testing.T) {
 	got := buildOrderedQuery([][2]string{
 		{"error", "invalid_scope"},
 		{"error_description", "requested scope is outside this client's ceiling"},
-		{"iss", "https://plytarium.com"},
+		{"iss", "https://issuer.example.test"},
 		{"state", "a b&c=d"},
 	})
-	want := "error=invalid_scope&error_description=requested%20scope%20is%20outside%20this%20client%27s%20ceiling&iss=https%3A%2F%2Fplytarium.com&state=a%20b%26c%3Dd"
+	want := "error=invalid_scope&error_description=requested%20scope%20is%20outside%20this%20client%27s%20ceiling&iss=https%3A%2F%2Fissuer.example.test&state=a%20b%26c%3Dd"
 	if got != want {
 		t.Fatalf("got:  %s\nwant: %s", got, want)
 	}
@@ -709,9 +709,9 @@ func TestOrderedRedirectQueryEncodingIsRFC3986(t *testing.T) {
 func TestOrderedRedirectAppendsToExistingQuery(t *testing.T) {
 	got := appendOrderedQuery("https://client.example.test/cb?already=here", [][2]string{
 		{"error", "invalid_request"},
-		{"iss", "https://plytarium.com"},
+		{"iss", "https://issuer.example.test"},
 	})
-	want := "https://client.example.test/cb?already=here&error=invalid_request&iss=https%3A%2F%2Fplytarium.com"
+	want := "https://client.example.test/cb?already=here&error=invalid_request&iss=https%3A%2F%2Fissuer.example.test"
 	if got != want {
 		t.Fatalf("got:  %s\nwant: %s", got, want)
 	}
@@ -719,7 +719,7 @@ func TestOrderedRedirectAppendsToExistingQuery(t *testing.T) {

 func TestAuthorizeBackendUnavailableIsOpaque500(t *testing.T) {
 	opts := DefaultOptions()
-	opts.Issuer = "https://plytarium.com"
+	opts.Issuer = "https://issuer.example.test"
 	srv := NewServer(opts)
 	req := authorizeRequest(map[string]string{"client_id": "anything"})
 	rec := httptest.NewRecorder()
--- a/modules/wristband/client_issue.go
+++ b/modules/wristband/client_issue.go
@@ -1,6 +1,6 @@
 // Shared client-issuing primitives used by both RFC 7591 registration
-// (register.go) and the app-owned fonoteka:oauth-client operator command
-// (08-CONTEXT.md D-19; T-08-SECRET-TIMING: "Shared hash/validation path and
+// (register.go) and the host application's operator command that issues
+// clients (08-CONTEXT.md D-19; T-08-SECRET-TIMING: "Shared hash/validation path and
 // one-time secret"). Exporting these rather than letting the command
 // re-derive its own random-id/hash/redirect-URI-validation logic keeps
 // exactly one code path responsible for how an OAuth client secret is
--- a/modules/wristband/consent_test.go
+++ b/modules/wristband/consent_test.go
@@ -13,7 +13,7 @@ import (
 func newConsentFixture(t *testing.T) (*Server, string) {
 	t.Helper()
 	s := NewServer(DefaultOptions())
-	s.opts.Issuer = "https://plytarium-consent-test.example"
+	s.opts.Issuer = "https://consent-test.example.test"
 	b := newMemoryBackend()
 	s.SetBackend(b)
 	ctx := context.Background()
--- a/modules/wristband/example_test.go
+++ b/modules/wristband/example_test.go
@@ -82,3 +82,40 @@ func ExampleIssueClientCredentials() {
 	// true true true <nil>
 	// true true <nil>
 }
+
+// newOIDCServer builds the OpenID Connect provider of an application served
+// at https://id.example.com. The host application supplies storage, the
+// signing-key ring and its pages; SetOIDCBackend refuses a nil one.
+func newOIDCServer(backend wristband.OIDCBackend, keys wristband.KeyStore, host wristband.OIDCHost) (*wristband.Server, error) {
+	opts := wristband.DefaultOptions()
+	opts.Issuer = "https://id.example.com"
+
+	oidc := wristband.DefaultOIDCOptions()
+	oidc.LoginURL = "/account/login"
+	oidc.RefreshEnabled = true // only clients with OfflineAccess get refresh tokens
+
+	srv := wristband.NewOIDCServer(opts, oidc)
+	if err := srv.SetOIDCBackend(backend, keys, host); err != nil {
+		return nil, err
+	}
+	return srv, nil
+}
+
+func ExampleNewOIDCServer() {
+	// Without storage, keys and a host the server refuses to start.
+	_, err := newOIDCServer(nil, nil, nil)
+	fmt.Println(err)
+
+	// An OIDC server serves discovery instead of the MCP metadata document.
+	srv := wristband.NewOIDCServer(wristband.DefaultOptions(), wristband.DefaultOIDCOptions())
+	rec := httptest.NewRecorder()
+	srv.Metadata(rec, httptest.NewRequest("GET", "/.well-known/oauth-authorization-server", nil))
+	fmt.Println("metadata", rec.Code)
+
+	defaults := wristband.DefaultOIDCOptions()
+	fmt.Println(defaults.ScopesSupported, defaults.CodeTTL, defaults.RefreshEnabled)
+	// Output:
+	// wristband: OIDC backend is nil
+	// metadata 404
+	// [openid profile email] 1m0s false
+}
--- a/modules/wristband/registration_test.go
+++ b/modules/wristband/registration_test.go
@@ -273,7 +273,10 @@ func (t *memoryTx) Revoke(ctx context.Context, tokenID uint) error {

 func newTestServer(backend Backend) *Server {
 	opts := DefaultOptions()
-	opts.Issuer = "https://plytarium.com"
+	opts.Issuer = "https://issuer.example.test"
+	// Resource has no default; tests that send resource set it like a host
+	// application would.
+	opts.Resource = "https://resource.example.test/mcp"
 	srv := NewServer(opts)
 	srv.SetBackend(backend)
 	return srv
--- a/modules/wristband/server.go
+++ b/modules/wristband/server.go
@@ -1,9 +1,11 @@
-// Package wristband implements the app-agnostic RFC 8414 / OAuth
-// authorization-server surface ported from Płytarium's hand-rolled PHP OAuth
-// server (08-CONTEXT.md D-05). It never imports an application package, a
-// GORM type, or any fonoteka model: every deployment-specific value (issuer,
-// scopes, endpoint paths, TTLs) arrives through Options, and every app-owned
-// concern (users, collections, persistence) stays out of this package.
+// Package wristband implements the app-agnostic OAuth authorization-server
+// surface: the MCP flavour (RFC 8414 metadata, RFC 7591 registration,
+// authorization code with PKCE, refresh rotation) ported from a hand-rolled
+// PHP OAuth server (08-CONTEXT.md D-05), and the OpenID Connect flavour
+// (19.4). It never imports an application package, a GORM type or any
+// application model: every deployment-specific value (issuer, scopes,
+// endpoint paths, TTLs) arrives through Options, and every concern of the
+// host application (users, persistence, pages) stays out of this package.
 //
 // D-06: PHP's RFC-minimal response shapes are wristband's defaults. There
 // are no response hooks; callers cannot alter the wire bytes beyond the
@@ -58,10 +60,12 @@ type Options struct {
 	// before JSON decoding (D-21, T-08-DCR-FLOOD). PHP default: 65536 (64 KiB).
 	RegisterMaxBodyBytes int64

-	// Resource is the expected RFC 8707 resource indicator value authorize
-	// checks an optional resource query parameter against (PHP
-	// config('fonoteka.mcp.resource'), D-03). PHP default:
-	// "https://mcp.plytarium.com/mcp".
+	// Resource is the expected RFC 8707 resource indicator value the MCP
+	// authorize endpoint checks an optional resource query parameter
+	// against. It has no default: the host application sets the URL of the
+	// resource its tokens are for. While it is empty, a request that sends
+	// resource is refused with invalid_target and a request without it is
+	// unaffected. The OIDC flavour ignores resource.
 	Resource string

 	// PendingRequestTTL is how long a pre-consent pending authorization row
@@ -87,7 +91,8 @@ type Options struct {
 }

 // DefaultOptions returns PHP-parity defaults for every metadata option
-// other than Issuer, which the caller must set from app.url.
+// other than Issuer, which the caller must set from app.url, and Resource,
+// which the host application must set for its deployment.
 func DefaultOptions() Options {
 	return Options{
 		ServiceDocumentationPath:                   "/help",
@@ -97,9 +102,8 @@ func DefaultOptions() Options {
 		DCRClientCap:                               200,
 		DCRUnconsentedSweepAge:                     24 * time.Hour,
 		RegisterMaxBodyBytes:                       65536,
-		Resource:                                   "https://mcp.plytarium.com/mcp",
 		PendingRequestTTL:                          600 * time.Second,
-		CodeTTL:                                     600 * time.Second,
+		CodeTTL:                                    600 * time.Second,
 		AccessTokenTTL:                             3600 * time.Second,
 		RefreshTokenTTL:                            30 * 24 * time.Hour,
 	}
--- a/modules/wristband/server_test.go
+++ b/modules/wristband/server_test.go
@@ -4,8 +4,10 @@ import (
 	"encoding/json"
 	"net/http"
 	"net/http/httptest"
+	"reflect"
 	"strings"
 	"testing"
+	"time"
 )

 // TestPhase8RedMetadata is the Phase 8 Wave 1 RED anchor (08-CONTEXT.md
@@ -15,7 +17,7 @@ import (
 // stub. scripts/check-phase8-red.sh verifies this failure is fail-closed.
 func TestPhase8RedMetadata(t *testing.T) {
 	opts := DefaultOptions()
-	opts.Issuer = "https://plytarium.com"
+	opts.Issuer = "https://issuer.example.test"
 	srv := NewServer(opts)

 	req := httptest.NewRequest(http.MethodGet, "/.well-known/oauth-authorization-server", nil)
@@ -27,7 +29,7 @@ func TestPhase8RedMetadata(t *testing.T) {
 		t.Fatalf("PHASE8_RED:metadata: status = %d, want %d", rec.Code, http.StatusOK)
 	}

-	const want = `{"issuer":"https://plytarium.com","authorization_endpoint":"https://plytarium.com/oauth/mcp/authorize","token_endpoint":"https://plytarium.com/oauth/mcp/token","registration_endpoint":"https://plytarium.com/oauth/mcp/register","response_types_supported":["code"],"grant_types_supported":["authorization_code","refresh_token"],"code_challenge_methods_supported":["S256"],"token_endpoint_auth_methods_supported":["none","client_secret_post","client_secret_basic"],"scopes_supported":["read","write","ai","offline_access"],"service_documentation":"https://plytarium.com/help","authorization_response_iss_parameter_supported":true}`
+	const want = `{"issuer":"https://issuer.example.test","authorization_endpoint":"https://issuer.example.test/oauth/mcp/authorize","token_endpoint":"https://issuer.example.test/oauth/mcp/token","registration_endpoint":"https://issuer.example.test/oauth/mcp/register","response_types_supported":["code"],"grant_types_supported":["authorization_code","refresh_token"],"code_challenge_methods_supported":["S256"],"token_endpoint_auth_methods_supported":["none","client_secret_post","client_secret_basic"],"scopes_supported":["read","write","ai","offline_access"],"service_documentation":"https://issuer.example.test/help","authorization_response_iss_parameter_supported":true}`

 	if got := rec.Body.String(); got != want {
 		t.Fatalf("PHASE8_RED:metadata: body mismatch\n got:  %s\nwant: %s", got, want)
@@ -44,7 +46,7 @@ func TestPhase8RedMetadata(t *testing.T) {
 // TestPhase8RedMetadata: same PHP-fixture bytes, now expected to pass.
 func TestMetadataExactBytes(t *testing.T) {
 	opts := DefaultOptions()
-	opts.Issuer = "https://plytarium.com"
+	opts.Issuer = "https://issuer.example.test"
 	srv := NewServer(opts)

 	req := httptest.NewRequest(http.MethodGet, "/.well-known/oauth-authorization-server", nil)
@@ -56,7 +58,7 @@ func TestMetadataExactBytes(t *testing.T) {
 		t.Fatalf("status = %d, want %d", rec.Code, http.StatusOK)
 	}

-	const want = `{"issuer":"https://plytarium.com","authorization_endpoint":"https://plytarium.com/oauth/mcp/authorize","token_endpoint":"https://plytarium.com/oauth/mcp/token","registration_endpoint":"https://plytarium.com/oauth/mcp/register","response_types_supported":["code"],"grant_types_supported":["authorization_code","refresh_token"],"code_challenge_methods_supported":["S256"],"token_endpoint_auth_methods_supported":["none","client_secret_post","client_secret_basic"],"scopes_supported":["read","write","ai","offline_access"],"service_documentation":"https://plytarium.com/help","authorization_response_iss_parameter_supported":true}`
+	const want = `{"issuer":"https://issuer.example.test","authorization_endpoint":"https://issuer.example.test/oauth/mcp/authorize","token_endpoint":"https://issuer.example.test/oauth/mcp/token","registration_endpoint":"https://issuer.example.test/oauth/mcp/register","response_types_supported":["code"],"grant_types_supported":["authorization_code","refresh_token"],"code_challenge_methods_supported":["S256"],"token_endpoint_auth_methods_supported":["none","client_secret_post","client_secret_basic"],"scopes_supported":["read","write","ai","offline_access"],"service_documentation":"https://issuer.example.test/help","authorization_response_iss_parameter_supported":true}`

 	if got := rec.Body.String(); got != want {
 		t.Fatalf("body mismatch\n got:  %s\nwant: %s", got, want)
@@ -121,3 +123,29 @@ func decodeAsMap(t *testing.T, body []byte) map[string]any {
 	}
 	return m
 }
+
+// TestDefaultOptionsResourceEmpty pins the folded 19.4 todo: the framework
+// default names no resource (the host application sets its own), and every
+// other default is unchanged.
+func TestDefaultOptionsResourceEmpty(t *testing.T) {
+	got := DefaultOptions()
+	if got.Resource != "" {
+		t.Fatalf("Resource = %q, want empty", got.Resource)
+	}
+	want := Options{
+		ServiceDocumentationPath:                   "/help",
+		ScopesSupported:                            []string{"read", "write", "ai", "offline_access"},
+		TokenEndpointAuthMethodsSupported:          []string{"none", "client_secret_post", "client_secret_basic"},
+		AuthorizationResponseIssParameterSupported: true,
+		DCRClientCap:                               200,
+		DCRUnconsentedSweepAge:                     24 * time.Hour,
+		RegisterMaxBodyBytes:                       65536,
+		PendingRequestTTL:                          600 * time.Second,
+		CodeTTL:                                    600 * time.Second,
+		AccessTokenTTL:                             3600 * time.Second,
+		RefreshTokenTTL:                            30 * 24 * time.Hour,
+	}
+	if !reflect.DeepEqual(got, want) {
+		t.Fatalf("DefaultOptions() = %+v, want %+v", got, want)
+	}
+}
--- a/modules/wristband/stores.go
+++ b/modules/wristband/stores.go
@@ -13,8 +13,8 @@ import (
 var ErrClientCapReached = errors.New("wristband: dynamic client registration cap reached")

 // ClientRecord is the app-agnostic persisted shape of an OAuth client row.
-// fonoteka's GORM adapter (classes/auth/oauth_store.go) converts to/from
-// its models.OAuthClient; wristband never imports GORM or fonoteka.
+// The host application's storage adapter converts to and from its own
+// model; wristband never imports GORM or an application package.
 type ClientRecord struct {
 	ID                      uint
 	ClientID                string
@@ -167,9 +167,9 @@ type RefreshTokenStore interface {
 	DeleteExpiredRefreshTokens(ctx context.Context, now time.Time) error
 }

-// AccessTokenIssuer mints/revokes the app's ordinary personal access token
-// (fonoteka: an inv_ token via ApiTokenManager) and stamps the owning OAuth
-// client id.
+// AccessTokenIssuer mints/revokes the host application's ordinary personal
+// access token (for example an inv_ token from its token manager) and
+// stamps the owning OAuth client id.
 type AccessTokenIssuer interface {
 	Mint(ctx context.Context, userID uint, name string, scopes []string, expiresAt time.Time, collectionIDs []uint, clientID string) (IssuedToken, error)
 	Revoke(ctx context.Context, tokenID uint) error
@@ -185,9 +185,9 @@ type Tx interface {
 	AccessTokenIssuer
 }

-// Backend opens one transaction-scoped Tx per call. The GORM adapter lives
-// in fonoteka.go's classes/auth package (D-07): wristband never imports
-// gorm.io/gorm or a fonoteka model.
+// Backend opens one transaction-scoped Tx per call. The storage adapter
+// lives in the host application (D-07): wristband never imports
+// gorm.io/gorm or an application model.
 type Backend interface {
 	WithinTx(ctx context.Context, fn func(Tx) error) error
 }
--- a/modules/wristband/token_test.go
+++ b/modules/wristband/token_test.go
@@ -386,7 +386,7 @@ func TestTokenResourceMismatchIsInvalidGrant(t *testing.T) {
 	srv := newTestServer(backend)
 	insertTokenTestClient(backend, "cli-res", "none", nil, nil)
 	verifier, challenge := s256Pair(t)
-	res := "https://mcp.plytarium.com/mcp"
+	res := "https://resource.example.test/mcp"
 	rawCode, _ := insertTokenTestCode(t, backend, "cli-res", challenge, func(rec *AuthCodeRecord) {
 		rec.Resource = &res
 	})
@@ -404,7 +404,7 @@ func TestTokenResourceOmittedIsAccepted(t *testing.T) {
 	srv := newTestServer(backend)
 	insertTokenTestClient(backend, "cli-res-omit", "none", nil, nil)
 	verifier, challenge := s256Pair(t)
-	res := "https://mcp.plytarium.com/mcp"
+	res := "https://resource.example.test/mcp"
 	rawCode, _ := insertTokenTestCode(t, backend, "cli-res-omit", challenge, func(rec *AuthCodeRecord) {
 		rec.Resource = &res
 	})
@@ -477,8 +477,8 @@ func TestTokenCodeSequentialReplayIsInvalidGrantSecondTime(t *testing.T) {
 // exchange the same code must produce exactly one 200 and one invalid_grant,
 // never two successes. memoryBackend serializes the whole WithinTx closure
 // behind one mutex (08-PATTERNS.md), which is exactly the seam this test
-// exercises; the real-Postgres row-lock proof lives in fonoteka.go's
-// classes/auth package.
+// exercises; the real-Postgres row-lock proof lives in the host application's
+// storage adapter.
 func TestTokenCodeConcurrentReplayHasExactlyOneWinner(t *testing.T) {
 	srv, _, verifier, rawCode, _ := newTokenExchangeFixture(t)
 	form := validExchangeForm(rawCode, verifier, "cli-tok")
@@ -972,7 +972,7 @@ func TestServerRevokeKillsAccessAndLineage(t *testing.T) {

 func TestTokenBackendUnavailableIsOpaque500(t *testing.T) {
 	opts := DefaultOptions()
-	opts.Issuer = "https://plytarium.com"
+	opts.Issuer = "https://issuer.example.test"
 	srv := NewServer(opts)
 	req := tokenRequest(url.Values{"grant_type": {"authorization_code"}}, "")
 	rec := httptest.NewRecorder()