add username or email check api

account/serializers.py

@@ -11,11 +11,15 @@ class UserLoginSerializer(serializers.Serializer):
     tfa_code = serializers.CharField(min_length=6, max_length=6, required=False, allow_null=True)
 
 
+class UsernameOrEmailCheckSerializer(serializers.Serializer):
+    username = serializers.CharField(max_length=30, required=False)
+    email = serializers.EmailField(max_length=30, required=False)
+
 class UserRegisterSerializer(serializers.Serializer):
     username = serializers.CharField(max_length=30)
     password = serializers.CharField(max_length=30, min_length=6)
-    email = serializers.EmailField(max_length=254)
+    email = serializers.EmailField(max_length=30)
-    captcha = serializers.CharField(max_length=4, min_length=4)
+    captcha = serializers.CharField(max_length=4, min_length=1)
 
 
 class UserChangePasswordSerializer(serializers.Serializer):

account/urls/oj.py

@@ -2,7 +2,7 @@ from django.conf.urls import url
 
 from ..views.oj import (ApplyResetPasswordAPI, ResetPasswordAPI,
                         UserChangePasswordAPI, UserRegisterAPI,
-                        UserLoginAPI, UserLogoutAPI)
+                        UserLoginAPI, UserLogoutAPI, UsernameOrEmailCheck)
 
 from utils.captcha.views import CaptchaAPIView
 
@@ -14,4 +14,5 @@ urlpatterns = [
     url(r"^apply_reset_password/?$", ApplyResetPasswordAPI.as_view(), name="apply_reset_password_api"),
     url(r"^reset_password/?$", ResetPasswordAPI.as_view(), name="apply_reset_password_api"),
     url(r"^captcha/?$", CaptchaAPIView.as_view(), name="show_captcha"),
+    url(r"^check_username_or_email", UsernameOrEmailCheck.as_view(), name="check_username_or_email")
 ]

account/views/oj.py

@@ -16,7 +16,7 @@ from ..models import User, UserProfile
 from ..serializers import (ApplyResetPasswordSerializer,
                            ResetPasswordSerializer,
                            UserChangePasswordSerializer, UserLoginSerializer,
-                           UserRegisterSerializer)
+                           UserRegisterSerializer, UsernameOrEmailCheckSerializer)
 from ..tasks import send_email_async
 
 
@@ -58,6 +58,27 @@ class UserLogoutAPI(APIView):
         return self.success({})
 
 
+class UsernameOrEmailCheck(APIView):
+    @validate_serializer(UsernameOrEmailCheckSerializer)
+    def post(self, request):
+        """
+        check username or email is duplicate
+        """
+        data = request.data
+        # True means OK.
+        result = {
+            "username": True,
+            "email": True
+        }
+        if data.get("username"):
+            if User.objects.filter(username=data["username"]).exists():
+                result["username"] = False
+        if data.get("email"):
+            if User.objects.filter(email=data["email"]).exists():
+                result["email"] = False
+        return self.success(result)
+
+
 class UserRegisterAPI(APIView):
     @validate_serializer(UserRegisterSerializer)
     def post(self, request):
@@ -66,7 +87,7 @@ class UserRegisterAPI(APIView):
         """
         data = request.data
         captcha = Captcha(request)
-        if not captcha.check(data["captcha"]):
+        if not captcha.validate(data["captcha"]):
             return self.error("Invalid captcha")
         try:
             User.objects.get(username=data["username"])