refactor: Removed asStringOrNull functions (calcom#25029)

Author: emrysal

apps/web/lib/asStringOrNull.tsx

@@ -9,31 +9,31 @@ import { ssoTenantProduct } from "@calcom/features/ee/sso/lib/sso";
 import { checkUsername } from "@calcom/features/profile/lib/checkUsername";
 import { OnboardingPathService } from "@calcom/features/onboarding/lib/onboarding-path.service";
 import { IS_PREMIUM_USERNAME_ENABLED } from "@calcom/lib/constants";
-import prisma from "@calcom/prisma";
+import { prisma } from "@calcom/prisma";
+import { z } from "zod";
 
-import { asStringOrNull } from "@lib/asStringOrNull";
+const Params = z.object({
+  username: z.string().optional(),
+  email: z.string().optional(),
+  provider: z.string({ required_error: "File is not named sso/[provider]" }),
+});
 
-export const getServerSideProps = async (context: GetServerSidePropsContext) => {
-  // get query params and typecast them to string
-  // (would be even better to assert them instead of typecasting)
-  const providerParam = asStringOrNull(context.query.provider);
-  const emailParam = asStringOrNull(context.query.email);
-  const usernameParam = asStringOrNull(context.query.username);
+export const getServerSideProps = async ({ req, query }: GetServerSidePropsContext) => {
+
+  const { 
+    provider: providerParam, 
+    email: emailParam, 
+    username: usernameParam,
+  } = Params.parse(query);
 
   const successDestination = await OnboardingPathService.getGettingStartedPathWithParams(
     prisma,
     usernameParam ? { username: usernameParam } : undefined
   );
 
-  if (!providerParam) {
-    throw new Error(`File is not named sso/[provider]`);
-  }
-
-  const { req } = context;
-
   const session = await getServerSession({ req });
 
-  const { currentOrgDomain } = orgDomainConfig(context.req);
+  const { currentOrgDomain } = orgDomainConfig(req);
 
   if (session) {
     // Validating if username is Premium, while this is true an email its required for stripe user confirmation