feat: Add allow registration field to admin settings

public/locales/en-US/admin-global-settings.json

@@ -66,6 +66,10 @@
     "maxAliasesPerUser": {
       "label": "Maximum aliases per user",
       "description": "The maximum number of aliases a user can create. 0 means unlimited. Existing aliases will not be affected."
+    },
+    "allowRegistrations": {
+      "label": "Allow registrations",
+      "description": "If enabled, users will be able to register on your instance. This only affects new account registrations."
     }
   }
 }

src/constants/admin-settings.ts

@@ -14,4 +14,5 @@ export const DEFAULT_ADMIN_SETTINGS: AdminSettings = {
 	allowStatistics: true,
 	allowAliasDeletion: false,
 	maxAliasesPerUser: 0,
+	allowRegistrations: true,
 }

src/route-widgets/GlobalSettingsRoute/SettingsForm.tsx

@@ -79,6 +79,7 @@ export default function SettingsForm({settings, queryKey}: SettingsFormProps) {
 		allowStatistics: yup.boolean().label(t("fields.allowStatistics.label")),
 		allowAliasDeletion: yup.boolean().label(t("fields.allowAliasDeletion.label")),
 		maxAliasesPerUser: yup.number().label(t("fields.maxAliasesPerUser.label")).min(0),
+		allowRegistrations: yup.boolean().label(t("fields.allowRegistrations.label")),
 	} as Record<keyof AdminSettings, any>)
 
 	const {mutateAsync} = useMutation<
@@ -520,6 +521,31 @@ export default function SettingsForm({settings, queryKey}: SettingsFormProps) {
 								</FormHelperText>
 							</FormGroup>
 						</Grid>
+						<Grid item xs={12}>
+							<FormGroup key="allow_registrations">
+								<FormControlLabel
+									control={
+										<Checkbox
+											checked={formik.values.allowRegistrations}
+											onChange={formik.handleChange}
+											name="allowRegistrations"
+										/>
+									}
+									disabled={formik.isSubmitting}
+									label={t("fields.allowRegistrations.label")}
+								/>
+								<FormHelperText
+									error={
+										formik.touched.allowRegistrations &&
+										Boolean(formik.errors.allowRegistrations)
+									}
+								>
+									{(formik.touched.allowRegistrations &&
+										formik.errors.allowRegistrations) ||
+										t("fields.allowRegistrations.description")}
+								</FormHelperText>
+							</FormGroup>
+						</Grid>
 					</Grid>
 				</Grid>
 				<Grid item>

src/server-types.ts

@@ -241,6 +241,7 @@ export interface AdminSettings {
 	allowStatistics: boolean
 	allowAliasDeletion: boolean
 	maxAliasesPerUser: number
+	allowRegistrations: boolean
 }
 
 export interface ServerCronReport {