refactor(auth): single DISABLE_EMAIL_SIGNUP env var controls both ui and backend

Author: TheodoreSpeaks

apps/sim/app/(auth)/signup/page.tsx

@@ -1,5 +1,5 @@
 import type { Metadata } from 'next'
-import { isRegistrationDisabled } from '@/lib/core/config/feature-flags'
+import { isEmailSignupDisabled, isRegistrationDisabled } from '@/lib/core/config/feature-flags'
 import { getOAuthProviderStatus } from '@/app/(auth)/components/oauth-provider-checker'
 import SignupForm from '@/app/(auth)/signup/signup-form'
 
@@ -23,6 +23,7 @@ export default async function SignupPage() {
       googleAvailable={googleAvailable}
       microsoftAvailable={microsoftAvailable}
       isProduction={isProduction}
+      emailSignupEnabled={!isEmailSignupDisabled}
     />
   )
 }

apps/sim/app/(auth)/signup/signup-form.tsx

@@ -77,13 +77,15 @@ interface SignupFormProps {
   googleAvailable: boolean
   microsoftAvailable: boolean
   isProduction: boolean
+  emailSignupEnabled: boolean
 }
 
 function SignupFormContent({
   githubAvailable,
   googleAvailable,
   microsoftAvailable,
   isProduction,
+  emailSignupEnabled,
 }: SignupFormProps) {
   const router = useRouter()
   const searchParams = useSearchParams()
@@ -354,8 +356,7 @@ function SignupFormContent({
 
   const ssoEnabled = isTruthy(getEnv('NEXT_PUBLIC_SSO_ENABLED'))
   const emailEnabled =
-    !isFalsy(getEnv('NEXT_PUBLIC_EMAIL_PASSWORD_SIGNUP_ENABLED')) &&
-    !isTruthy(getEnv('NEXT_PUBLIC_DISABLE_EMAIL_SIGNUP'))
+    !isFalsy(getEnv('NEXT_PUBLIC_EMAIL_PASSWORD_SIGNUP_ENABLED')) && emailSignupEnabled
   const hasSocial = githubAvailable || googleAvailable || microsoftAvailable
   const hasOnlySSO = ssoEnabled && !emailEnabled && !hasSocial
   const showBottomSection = hasSocial || (ssoEnabled && !hasOnlySSO)
@@ -615,6 +616,7 @@ export default function SignupPage({
   googleAvailable,
   microsoftAvailable,
   isProduction,
+  emailSignupEnabled,
 }: SignupFormProps) {
   return (
     <Suspense fallback={<div className='flex h-screen items-center justify-center'>Loading…</div>}>
@@ -623,6 +625,7 @@ export default function SignupPage({
         googleAvailable={googleAvailable}
         microsoftAvailable={microsoftAvailable}
         isProduction={isProduction}
+        emailSignupEnabled={emailSignupEnabled}
       />
     </Suspense>
   )

apps/sim/lib/core/config/env.ts

@@ -505,7 +505,6 @@ export const env = createEnv({
     NEXT_PUBLIC_DISABLE_PUBLIC_API:        z.boolean().optional(),                   // Disable public API access UI toggle globally
     NEXT_PUBLIC_INBOX_ENABLED:             z.boolean().optional(),                   // Enable inbox (Sim Mailer) on self-hosted
     NEXT_PUBLIC_EMAIL_PASSWORD_SIGNUP_ENABLED: z.boolean().optional().default(true), // Control visibility of email/password login forms
-    NEXT_PUBLIC_DISABLE_EMAIL_SIGNUP:          z.boolean().optional(),               // Hide email/password form on /signup only (set alongside DISABLE_EMAIL_SIGNUP)
     NEXT_PUBLIC_TURNSTILE_SITE_KEY:        z.string().min(1).optional(),           // Cloudflare Turnstile site key for captcha widget
   },
 
@@ -545,7 +544,6 @@ export const env = createEnv({
     NEXT_PUBLIC_DISABLE_PUBLIC_API: process.env.NEXT_PUBLIC_DISABLE_PUBLIC_API,
     NEXT_PUBLIC_INBOX_ENABLED: process.env.NEXT_PUBLIC_INBOX_ENABLED,
     NEXT_PUBLIC_EMAIL_PASSWORD_SIGNUP_ENABLED: process.env.NEXT_PUBLIC_EMAIL_PASSWORD_SIGNUP_ENABLED,
-    NEXT_PUBLIC_DISABLE_EMAIL_SIGNUP: process.env.NEXT_PUBLIC_DISABLE_EMAIL_SIGNUP,
     NEXT_PUBLIC_TURNSTILE_SITE_KEY: process.env.NEXT_PUBLIC_TURNSTILE_SITE_KEY,
     NEXT_PUBLIC_E2B_ENABLED: process.env.NEXT_PUBLIC_E2B_ENABLED,
     NEXT_PUBLIC_BEDROCK_DEFAULT_CREDENTIALS: process.env.NEXT_PUBLIC_BEDROCK_DEFAULT_CREDENTIALS,