refactor(backend): don't create local user if password is too weak

This prevents the previous problem that the backend created a user that was then not correctly removed again

Signed-off-by: Philip Molares <philip.molares@udo.edu>

backend/src/api/private/auth/auth.controller.ts

@@ -58,6 +58,7 @@ export class AuthController {
     @Req() request: RequestWithSession,
     @Body() registerDto: RegisterDto,
   ): Promise<void> {
+    await this.identityService.checkPasswordStrength(registerDto.password);
     const user = await this.usersService.createUser(
       registerDto.username,
       registerDto.displayName,