done last commit before merging - fixed media URLSs S3

backend/account/serializers.py

@@ -217,6 +217,31 @@ class PasswordResetConfirmSerializer(serializers.Serializer):
         return value
 
 
+class ChangeEmailSerializer(serializers.Serializer):
+    current_password = serializers.CharField(write_only=True)
+    new_email = serializers.EmailField()
+    turnstile_token = serializers.CharField(write_only=True, required=False, allow_blank=True)
+
+    def validate_new_email(self, value):
+        value = value.lower()
+        if User.objects.filter(email__iexact=value).exists():
+            raise serializers.ValidationError("Tento e-mail je již používán.")
+        return value
+
+
+class ChangeUsernameSerializer(serializers.Serializer):
+    new_username = serializers.CharField(min_length=3, max_length=150)
+    turnstile_token = serializers.CharField(write_only=True, required=False, allow_blank=True)
+
+    def validate_new_username(self, value):
+        import re
+        if not re.match(r'^[\w.@+-]+$', value):
+            raise serializers.ValidationError("Povolena jsou písmena, číslice a znaky @/./+/-/_.")
+        if User.objects.filter(username__iexact=value).exists():
+            raise serializers.ValidationError("Toto uživatelské jméno je již obsazeno.")
+        return value
+
+
 class ChangePasswordSerializer(serializers.Serializer):
     current_password = serializers.CharField(write_only=True)
     new_password = serializers.CharField(write_only=True)