Feat/navigate to signup if email does not exist (#540)

* Add userExists route

* Fix demo mode for login

* Improve sign in/up flow

* Remove redundant password length constraint

* Fix test

server/src/core/auth/services/auth.service.ts

@@ -11,6 +11,7 @@ import { PASSWORD_REGEX, compareHash, hashPassword } from '../auth.util';
 import { Verify } from '../dto/verify.entity';
 import { TokenService } from './token.service';
 import { Prisma } from '@prisma/client';
+import { UserExists } from '../dto/user-exists.entity';
 
 export type UserPayload = {
   firstName: string;
@@ -26,18 +27,16 @@ export class AuthService {
   ) {}
 
   async challenge(challengeInput: ChallengeInput) {
-    assert(
-      PASSWORD_REGEX.test(challengeInput.password),
-      'Password too weak',
-      BadRequestException,
-    );
-
     let user = await this.userService.findUnique({
       where: {
         email: challengeInput.email,
       },
     });
 
+    const isPasswordValid = PASSWORD_REGEX.test(challengeInput.password);
+
+    assert(!!user || isPasswordValid, 'Password too weak', BadRequestException);
+
     if (!user) {
       const passwordHash = await hashPassword(challengeInput.password);
 
@@ -92,4 +91,14 @@ export class AuthService {
       },
     };
   }
+
+  async checkUserExists(email: string): Promise<UserExists> {
+    const user = await this.userService.findUnique({
+      where: {
+        email,
+      },
+    });
+
+    return { exists: !!user };
+  }
 }