feat: add granular signup disable flags (#2765)

apps/remix/app/routes/_unauthenticated+/signin.tsx

@@ -3,9 +3,9 @@ import {
   IS_GOOGLE_SSO_ENABLED,
   IS_MICROSOFT_SSO_ENABLED,
   IS_OIDC_SSO_ENABLED,
+  isSignupEnabledForProvider,
   OIDC_PROVIDER_LABEL,
 } from '@documenso/lib/constants/auth';
-import { env } from '@documenso/lib/utils/env';
 import { isValidReturnTo, normalizeReturnTo } from '@documenso/lib/utils/is-valid-return-to';
 import { Alert, AlertDescription } from '@documenso/ui/primitives/alert';
 import { msg } from '@lingui/core/macro';
@@ -32,6 +32,11 @@ export async function loader({ request }: Route.LoaderArgs) {
   const isMicrosoftSSOEnabled = IS_MICROSOFT_SSO_ENABLED;
   const isOIDCSSOEnabled = IS_OIDC_SSO_ENABLED;
   const oidcProviderLabel = OIDC_PROVIDER_LABEL;
+  const isSignupEnabled =
+    isSignupEnabledForProvider('email') ||
+    (IS_GOOGLE_SSO_ENABLED && isSignupEnabledForProvider('google')) ||
+    (IS_MICROSOFT_SSO_ENABLED && isSignupEnabledForProvider('microsoft')) ||
+    (IS_OIDC_SSO_ENABLED && isSignupEnabledForProvider('oidc'));
 
   let returnTo = new URL(request.url).searchParams.get('returnTo') ?? undefined;
 
@@ -45,13 +50,15 @@ export async function loader({ request }: Route.LoaderArgs) {
     isGoogleSSOEnabled,
     isMicrosoftSSOEnabled,
     isOIDCSSOEnabled,
+    isSignupEnabled,
     oidcProviderLabel,
     returnTo,
   };
 }
 
 export default function SignIn({ loaderData }: Route.ComponentProps) {
-  const { isGoogleSSOEnabled, isMicrosoftSSOEnabled, isOIDCSSOEnabled, oidcProviderLabel, returnTo } = loaderData;
+  const { isGoogleSSOEnabled, isMicrosoftSSOEnabled, isOIDCSSOEnabled, isSignupEnabled, oidcProviderLabel, returnTo } =
+    loaderData;
 
   const { _ } = useLingui();
 
@@ -95,7 +102,7 @@ export default function SignIn({ loaderData }: Route.ComponentProps) {
           returnTo={returnTo}
         />
 
-        {!isEmbeddedRedirect && env('NEXT_PUBLIC_DISABLE_SIGNUP') !== 'true' && (
+        {!isEmbeddedRedirect && isSignupEnabled && (
           <p className="mt-6 text-center text-muted-foreground text-sm">
             <Trans>
               Don't have an account?{' '}