feat: add FORM_LOGIN_ENABLED auth toggle (#334)

backend/src/plugins/auth.ts

@@ -47,7 +47,7 @@ export async function getAnonymousUserId(): Promise<number> {
 export interface AuthState {
 	authEnabled: boolean;
 	registrationEnabled: boolean;
-	localAuthEnabled: boolean;
+	formLoginEnabled: boolean;
 	oidcEnabled: boolean;
 	oidcProviderName: string;
 	hasUsers: boolean;
@@ -59,15 +59,18 @@ export async function getAuthState(): Promise<AuthState> {
 	const [result] = await db.select({ count: count() }).from(users).where(sql`${users.id} != ${ANONYMOUS_USER_ID}`);
 	const hasUsers = result.count > 0;
 
+	const needsSetup = env.AUTH_ENABLED && !hasUsers;
+
 	return {
 		authEnabled: env.AUTH_ENABLED,
 		// Registration: enabled via ENV OR no users exist (first-time setup)
 		registrationEnabled: env.REGISTRATION_ENABLED || !hasUsers,
-		localAuthEnabled: env.AUTH_ENABLED, // Password auth available when auth is enabled
+		// Form login: enabled when auth + form login are both on, or forced on for first-user setup
+		formLoginEnabled: needsSetup || (env.AUTH_ENABLED && env.FORM_LOGIN_ENABLED),
 		oidcEnabled: env.OIDC_ENABLED,
 		oidcProviderName: env.OIDC_PROVIDER_NAME,
 		hasUsers,
-		needsSetup: env.AUTH_ENABLED && !hasUsers,
+		needsSetup,
 	};
 }
 

backend/src/plugins/env.ts

@@ -28,7 +28,11 @@ const EnvSchema = z.object({
 		.string()
 		.transform((v) => v === "true")
 		.default("false"),
-	// Disable local auth when using SSO only
+	// Disable username/password form login (useful for OIDC-only setups)
+	FORM_LOGIN_ENABLED: z
+		.string()
+		.transform((v) => v === "true")
+		.default("true"),
 
 	// JWT Secrets - only required when AUTH_ENABLED=true
 	JWT_SECRET: z.string().min(10).optional(),
@@ -128,4 +132,26 @@ if (parsed.OIDC_ENABLED) {
 	}
 }
 
+// Validate that at least one login method is available when auth is enabled
+if (parsed.AUTH_ENABLED && !parsed.FORM_LOGIN_ENABLED && !parsed.OIDC_ENABLED) {
+	console.error("=".repeat(60));
+	console.error("AUTHENTICATION CONFIGURATION ERROR");
+	console.error("=".repeat(60));
+	console.error("AUTH_ENABLED=true but no login method is available.");
+	console.error("FORM_LOGIN_ENABLED=false and OIDC_ENABLED=false means users cannot log in.");
+	console.error("");
+	console.error("To fix this, either:");
+	console.error("  1. Set FORM_LOGIN_ENABLED=true to allow username/password login");
+	console.error("  2. Set OIDC_ENABLED=true to allow SSO login");
+	console.error("=".repeat(60));
+	process.exit(1);
+}
+
+// Warn about ineffective registration when form login is disabled
+if (parsed.REGISTRATION_ENABLED && !parsed.FORM_LOGIN_ENABLED) {
+	console.warn(
+		"[config] REGISTRATION_ENABLED=true has no effect when FORM_LOGIN_ENABLED=false (no registration form available)"
+	);
+}
+
 export const env = parsed;

backend/src/routes/auth.ts

@@ -123,8 +123,8 @@ export async function authRoutes(app: FastifyInstance) {
 				return reply.status(400).send({ error: "Registration is disabled", code: "REGISTRATION_DISABLED" });
 			}
 
-			if (!state.localAuthEnabled) {
-				return reply.status(400).send({ error: "Local authentication is disabled", code: "LOCAL_AUTH_DISABLED" });
+			if (!state.formLoginEnabled) {
+				return reply.status(400).send({ error: "Form login is disabled", code: "FORM_LOGIN_DISABLED" });
 			}
 
 			// Validate input
@@ -185,8 +185,8 @@ export async function authRoutes(app: FastifyInstance) {
 				return reply.status(400).send({ error: "Authentication is disabled", code: "AUTH_DISABLED" });
 			}
 
-			if (!state.localAuthEnabled) {
-				return reply.status(400).send({ error: "Local authentication is disabled", code: "LOCAL_AUTH_DISABLED" });
+			if (!state.formLoginEnabled) {
+				return reply.status(400).send({ error: "Form login is disabled", code: "FORM_LOGIN_DISABLED" });
 			}
 
 			const parsed = loginSchema.safeParse(request.body);

backend/src/test/auth.test.ts

@@ -28,7 +28,7 @@ vi.mock("../db/client.js", () => ({
 vi.mock("../plugins/env.js", () => ({
 	env: {
 		AUTH_ENABLED: true,
-		LOCAL_AUTH_ENABLED: true,
+		FORM_LOGIN_ENABLED: true,
 		REGISTRATION_ENABLED: true,
 		OIDC_ENABLED: false,
 		NODE_ENV: "test",
@@ -144,7 +144,7 @@ describe("Auth Routes (AUTH_ENABLED=true)", () => {
 			const data = response.json();
 			expect(data.authEnabled).toBe(true);
 			expect(data.registrationEnabled).toBe(true);
-			expect(data.localAuthEnabled).toBe(true);
+			expect(data.formLoginEnabled).toBe(true);
 		});
 	});