feat: create rpc toast error type

messages/en.json

@@ -31,7 +31,8 @@
     "error": "Oops! Something went wrong",
     "errorDescription": "Don't worry, our best hackers are on it!",
     "goToHomepage": "Return to homepage",
-    "tryAgain": "Try again"
+    "tryAgain": "Try again",
+    "invalidLocale": "Invalid locale: {locale}"
   },
   "auth": {
     "welcome": "Welcome!",

messages/no.json

@@ -31,7 +31,8 @@
     "error": "Oops! Noe gikk galt",
     "errorDescription": "Ikke bekymre deg, våre beste hackere jobber med saken!",
     "goToHomepage": "Gå tilbake til hjemmesiden",
-    "tryAgain": "Prøv igjen"
+    "tryAgain": "Prøv igjen",
+    "invalidLocale": "Ugyldig språk: {locale}"
   },
   "auth": {
     "welcome": "Velkommen!",

src/server/api/locale.ts

@@ -0,0 +1,20 @@
+import { TRPCError } from '@trpc/server';
+import { getTranslations } from 'next-intl/server';
+import { cookies } from 'next/headers';
+
+import { routing } from '@/lib/locale';
+
+async function getLocaleFromCookie() {
+  const cookieStore = await cookies();
+  const locale = cookieStore.get('locale')?.value ?? routing.defaultLocale;
+  if (!routing.locales.includes(locale as 'en')) {
+    const t = await getTranslations('error');
+    throw new TRPCError({
+      code: 'BAD_REQUEST',
+      message: t('invalidLocale', { locale }),
+    });
+  }
+  return locale;
+}
+
+export { getLocaleFromCookie };

src/server/api/routers/auth.ts

@@ -17,6 +17,9 @@ const authRouter = createRouter({
       throw new TRPCError({
         code: 'TOO_MANY_REQUESTS',
         message: 'Rate limit exceeded. Please try again later.',
+        data: {
+          toast: 'error',
+        },
       });
     }
     return getFeideAuthorizationURL();

src/server/api/trpc.ts

@@ -1,17 +1,22 @@
 import type { createContext } from '@/server/api/context';
+import type { TRPCError } from '@/server/api/types';
 import { initTRPC } from '@trpc/server';
 import superjson from 'superjson';
 import { ZodError } from 'zod';
 
 const trpc = initTRPC.context<typeof createContext>().create({
   transformer: superjson,
   errorFormatter({ shape, error }) {
+    const TRPCError = error as TRPCError;
     return {
       ...shape,
       data: {
         ...shape.data,
         zodError:
-          error.cause instanceof ZodError ? error.cause.flatten() : null,
+          TRPCError.cause instanceof ZodError
+            ? TRPCError.cause.flatten()
+            : null,
+        toast: TRPCError.toast,
       },
     };
   },

src/server/api/types.ts

@@ -0,0 +1,7 @@
+import type { TRPCError as BaseTRPCError } from '@trpc/server';
+
+type TRPCError = BaseTRPCError & {
+  toast?: 'success' | 'info' | 'warning' | 'error';
+};
+
+export type { TRPCError };