Feat: Update user validation schema to include username/email check

The validation schema will throw an error if the username or email is already found in the database.

src/pages/api/users/check-email.ts

@@ -0,0 +1,43 @@
+import NextConnectOptions from '@/config/nextConnect/NextConnectOptions';
+
+import APIResponseValidationSchema from '@/validation/APIResponseValidationSchema';
+import { NextApiRequest, NextApiResponse } from 'next';
+import { createRouter } from 'next-connect';
+import { z } from 'zod';
+import validateRequest from '@/config/nextConnect/middleware/validateRequest';
+import findUserByEmail from '@/services/User/findUserByEmail';
+
+const CheckEmailRequestQuerySchema = z.object({
+  email: z.string(),
+});
+
+interface CheckEmailRequestSchema extends NextApiRequest {
+  query: z.infer<typeof CheckEmailRequestQuerySchema>;
+}
+
+const router = createRouter<
+  CheckEmailRequestSchema,
+  NextApiResponse<z.infer<typeof APIResponseValidationSchema>>
+>();
+
+const checkEmail = async (req: NextApiRequest, res: NextApiResponse) => {
+  const { email: emailToCheck } = req.query;
+
+  const email = await findUserByEmail(emailToCheck as string);
+
+  res.json({
+    success: true,
+    payload: { emailIsTaken: !!email },
+    statusCode: 200,
+    message: 'Getting username availability.',
+  });
+};
+
+router.get(
+  validateRequest({ querySchema: z.object({ email: z.string().email() }) }),
+  checkEmail,
+);
+
+const handler = router.handler(NextConnectOptions);
+
+export default handler;

src/pages/api/users/check-username.ts

@@ -0,0 +1,43 @@
+import NextConnectOptions from '@/config/nextConnect/NextConnectOptions';
+
+import APIResponseValidationSchema from '@/validation/APIResponseValidationSchema';
+import { NextApiRequest, NextApiResponse } from 'next';
+import { createRouter } from 'next-connect';
+import { z } from 'zod';
+import validateRequest from '@/config/nextConnect/middleware/validateRequest';
+import findUserByUsername from '@/services/User/findUserByUsername';
+
+const CheckUsernameRequestQuerySchema = z.object({
+  username: z.string(),
+});
+
+interface CheckUsernameRequestSchema extends NextApiRequest {
+  query: z.infer<typeof CheckUsernameRequestQuerySchema>;
+}
+
+const router = createRouter<
+  CheckUsernameRequestSchema,
+  NextApiResponse<z.infer<typeof APIResponseValidationSchema>>
+>();
+
+const checkUsername = async (req: NextApiRequest, res: NextApiResponse) => {
+  const { username: usernameToCheck } = req.query;
+
+  const user = await findUserByUsername(usernameToCheck as string);
+
+  res.json({
+    success: true,
+    payload: { usernameIsTaken: !!user },
+    statusCode: 200,
+    message: 'Getting username availability.',
+  });
+};
+
+router.get(
+  validateRequest({ querySchema: z.object({ username: z.string() }) }),
+  checkUsername,
+);
+
+const handler = router.handler(NextConnectOptions);
+
+export default handler;