refactor: remove OIDC authentication

app/api/auth/[...nextauth]/route.ts

@@ -1,47 +0,0 @@
-import NextAuth, { type NextAuthOptions } from "next-auth";
-import type { OAuthConfig } from "next-auth/providers/oauth";
-import {
-  getAuthMode,
-  getOidcProviderName,
-  getRequiredAuthSecret,
-  mapOidcProfile,
-  type OidcProfile,
-} from "@/lib/auth-config";
-
-const authMode = getAuthMode();
-
-function oidcProvider(): OAuthConfig<OidcProfile> {
-  return {
-    id: "oidc",
-    name: getOidcProviderName(),
-    type: "oauth",
-    wellKnown: `${process.env.OIDC_ISSUER}/.well-known/openid-configuration`,
-    authorization: { params: { scope: "openid profile email" } },
-    checks: ["pkce", "state"],
-    clientId: process.env.OIDC_CLIENT_ID,
-    clientSecret: process.env.OIDC_CLIENT_SECRET,
-    idToken: true,
-    profile(profile) {
-      return mapOidcProfile(profile);
-    },
-  };
-}
-
-const authOptions: NextAuthOptions = {
-  providers: authMode.enabled ? [oidcProvider()] : [],
-  secret: authMode.enabled ? getRequiredAuthSecret() : "auth-disabled",
-  session: {
-    strategy: "jwt",
-  },
-};
-
-const handler = authMode.enabled
-  ? NextAuth(authOptions)
-  : function authDisabled() {
-      return Response.json(
-        { error: authMode.error ?? "OIDC authentication is not configured." },
-        { status: authMode.error ? 500 : 404 }
-      );
-    };
-
-export { handler as GET, handler as POST };