Make subscription_type, username, and years optional on POST /v1/admin/users

- subscription_type defaults to lifetime when omitted; validated when provided
- years is only required (and enforced) when subscription_type is yearly
- username uniqueness check and validation are skipped when username is empty
- Update OpenAPI spec to reflect pubkey as the only required field

internal/http/docs/openapi.yaml

@@ -108,6 +108,19 @@ paths:
           content:
             application/json:
               schema: { $ref: '#/components/schemas/Pricing' }
+  /v1/whitelist/pubkeys:
+    get:
+      tags: [Public]
+      summary: Active whitelist pubkeys
+      description: Hex-encoded pubkeys for all active (whitelisted) subscribers.
+      responses:
+        '200':
+          description: Pubkey list
+          content:
+            application/json:
+              schema:
+                type: array
+                items: { type: string, description: Hex pubkey }
   /v1/invoices:
     post:
       tags: [User]
@@ -209,12 +222,12 @@ paths:
           application/json:
             schema:
               type: object
-              required: [pubkey, username, subscription_type]
+              required: [pubkey]
               properties:
                 pubkey: { type: string }
-                username: { type: string }
-                subscription_type: { type: string, enum: [yearly, lifetime] }
-                years: { type: integer }
+                username: { type: string, description: "Optional NIP-05 username to assign" }
+                subscription_type: { type: string, enum: [yearly, lifetime], description: "Defaults to lifetime when omitted" }
+                years: { type: integer, description: "Required when subscription_type is yearly" }
       responses:
         '201':
           description: Created

internal/http/handlers/admin_users.go

@@ -42,22 +42,28 @@ func (h *AdminUsers) Add(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 	sub := user.SubscriptionType(body.SubscriptionType)
-	if !sub.Valid() {
+	if body.SubscriptionType == "" {
+		sub = user.SubLifetime
+	} else if !sub.Valid() {
 		WriteError(w, http.StatusBadRequest, "ValidationError", "invalid subscription_type")
 		return
 	}
+
 	years := body.Years
-	if years <= 0 {
-		years = 1
+	if sub == user.SubYearly && years <= 0 {
+		WriteError(w, http.StatusBadRequest, "ValidationError", "years is required for yearly subscription")
+		return
 	}
 
 	if existing, err := h.Users.Repo().GetByPubkey(r.Context(), hexpk); err == nil && existing != nil {
 		WriteError(w, http.StatusConflict, "Conflict", "user already exists")
 		return
 	}
-	if existing, err := h.Users.Repo().GetByUsername(r.Context(), user.NormalizeUsername(body.Username)); err == nil && existing != nil {
-		WriteError(w, http.StatusConflict, "Conflict", "username taken")
-		return
+	if body.Username != "" {
+		if existing, err := h.Users.Repo().GetByUsername(r.Context(), user.NormalizeUsername(body.Username)); err == nil && existing != nil {
+			WriteError(w, http.StatusConflict, "Conflict", "username taken")
+			return
+		}
 	}
 
 	u, err := h.Users.CreateOrActivate(r.Context(), hexpk, body.Username, sub, years, true)

internal/http/handlers/users.go

@@ -61,3 +61,12 @@ func (h *Users) Get(w http.ResponseWriter, r *http.Request) {
 	}
 	WriteJSON(w, http.StatusOK, resp)
 }
+
+func (h *Users) ListWhitelistedPubkeys(w http.ResponseWriter, r *http.Request) {
+	pubkeys, err := h.Users.Repo().ListActivePubkeys(r.Context())
+	if err != nil {
+		WriteError(w, http.StatusInternalServerError, "InternalError", err.Error())
+		return
+	}
+	WriteJSON(w, http.StatusOK, pubkeys)
+}

internal/http/server.go

@@ -65,6 +65,7 @@ func NewServer(d Deps) *http.Server {
 
 	r.Route("/v1", func(r chi.Router) {
 		r.Get("/pricing", pricing.Handle)
+		r.Get("/whitelist/pubkeys", users.ListWhitelistedPubkeys)
 		r.Get("/users/{pubkey}", users.Get)
 		r.Get("/usernames/{name}/available", usernames.Available)
 		if d.Invoices != nil {

internal/http/server_test.go

@@ -162,6 +162,53 @@ func TestNostrJSON_EmptyAndPopulated(t *testing.T) {
 	}
 }
 
+func TestWhitelistPubkeys(t *testing.T) {
+	f := newFixture(t)
+
+	resp, body := f.get(t, "/v1/whitelist/pubkeys")
+	if resp.StatusCode != 200 {
+		t.Fatalf("empty list status %d: %s", resp.StatusCode, body)
+	}
+	var empty []string
+	if err := json.Unmarshal(body, &empty); err != nil {
+		t.Fatal(err)
+	}
+	if len(empty) != 0 {
+		t.Errorf("expected empty array: %s", body)
+	}
+
+	f.admin(t, "POST", "/v1/admin/users", map[string]any{
+		"pubkey": testHex, "username": "alice",
+		"subscription_type": "yearly", "years": 1,
+	})
+
+	inactiveHex := "1f8c41ebcd55a8d8db2e0a8c3a4b9c5e6f7a8b9c0d1e2f3a4b5c6d7e8f9a0b1d"
+	_, err := f.db.ExecContext(context.Background(),
+		`INSERT INTO users (pubkey, username, subscription_type, expires_at, is_active, manual_username, created_at)
+		 VALUES (?, 'bob', 'yearly', NULL, 0, 1, datetime('now'))`,
+		inactiveHex)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	resp, body = f.get(t, "/v1/whitelist/pubkeys")
+	if resp.StatusCode != 200 {
+		t.Fatalf("status %d: %s", resp.StatusCode, body)
+	}
+	var pubkeys []string
+	if err := json.Unmarshal(body, &pubkeys); err != nil {
+		t.Fatal(err)
+	}
+	if len(pubkeys) != 1 || pubkeys[0] != testHex {
+		t.Errorf("want [%s], got %v (body %s)", testHex, pubkeys, body)
+	}
+	for _, pk := range pubkeys {
+		if pk == inactiveHex {
+			t.Errorf("inactive pubkey should not appear: %v", pubkeys)
+		}
+	}
+}
+
 func TestUsernameAvailability(t *testing.T) {
 	f := newFixture(t)
 	resp, body := f.get(t, "/v1/usernames/alice/available")

internal/user/repo_query.go

@@ -50,6 +50,24 @@ func (r *Repo) ActiveByName(ctx context.Context) (map[string]string, error) {
 	return out, rows.Err()
 }
 
+func (r *Repo) ListActivePubkeys(ctx context.Context) ([]string, error) {
+	rows, err := r.db.QueryContext(ctx,
+		`SELECT pubkey FROM users WHERE is_active = 1 ORDER BY pubkey`)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	out := make([]string, 0)
+	for rows.Next() {
+		var pk string
+		if err := rows.Scan(&pk); err != nil {
+			return nil, err
+		}
+		out = append(out, pk)
+	}
+	return out, rows.Err()
+}
+
 func (r *Repo) collect(rows interface {
 	Next() bool
 	Scan(...any) error

internal/user/service.go

@@ -39,8 +39,10 @@ func (s *Service) IsAvailable(ctx context.Context, username string) (bool, error
 // concerns (e.g. payments worker uses this within a tx).
 func (s *Service) CreateOrActivate(ctx context.Context, pubkey, username string, sub SubscriptionType, years int, manual bool) (*User, error) {
 	username = NormalizeUsername(username)
-	if err := ValidateUsername(username, s.reserved); err != nil {
-		return nil, err
+	if username != "" {
+		if err := ValidateUsername(username, s.reserved); err != nil {
+			return nil, err
+		}
 	}
 	now := time.Now().UTC()
 	expiresAt := computeExpiry(sub, years, time.Time{}, now)