feat(users): normalize email identity storage

apps/users/models.py

@@ -1,9 +1,12 @@
 from django.contrib.auth.models import AbstractUser
 from django.db import models
+from django.db.models import Q
+from django.db.models.functions import Lower
 
 from core.models.base import BaseModel
 from core.utils import calculate_age, common_datetime_str
 
+from apps.users.email_identity import normalize_email_identity
 from apps.users.services.managers import UserManager
 
 
@@ -11,7 +14,7 @@ class User(AbstractUser, BaseModel):
     username = None
 
     mobile = models.CharField(max_length=11, unique=True)
-    email = models.EmailField(blank=True, default="")
+    email = models.EmailField(blank=True, null=True, default=None)
 
     description = models.TextField(blank=True, default="")
     profile_picture = models.ImageField(upload_to="profile/users/", blank=True, null=True)
@@ -41,11 +44,22 @@ class User(AbstractUser, BaseModel):
     def __str__(self):
         return self.full_name or self.mobile
 
+    def save(self, *args, **kwargs):
+        self.email = normalize_email_identity(self.email)
+        super().save(*args, **kwargs)
+
     class Meta:
         verbose_name = "user"
         verbose_name_plural = "users"
         db_table = "user"
         ordering = ("-updated_at", "-created_at")
+        constraints = (
+            models.UniqueConstraint(
+                Lower("email"),
+                condition=Q(email__isnull=False),
+                name="user_email_ci_uniq",
+            ),
+        )
         indexes = (
             models.Index(fields=["id"], name="user_id_idx"),
             models.Index(fields=["mobile"], name="user_mobile_idx"),
@@ -78,7 +92,7 @@ class UserSocialAccount(BaseModel):
     user = models.ForeignKey(User, on_delete=models.CASCADE, related_name="social_accounts")
     provider = models.CharField(max_length=32, choices=ProviderType.choices)
     provider_user_id = models.CharField(max_length=255)
-    email = models.EmailField(blank=True, default="")
+    email = models.EmailField(blank=True, null=True, default=None)
     email_verified = models.BooleanField(default=False)
     avatar_url = models.URLField(blank=True, default="")
 
@@ -100,3 +114,7 @@ class UserSocialAccount(BaseModel):
 
     def __str__(self):
         return f"{self.provider}:{self.provider_user_id}"
+
+    def save(self, *args, **kwargs):
+        self.email = normalize_email_identity(self.email)
+        super().save(*args, **kwargs)