feat: add AirShelf core implementation

core/backend/apps/accounts/serializers.py

@@ -0,0 +1,68 @@
+from rest_framework import serializers
+
+from apps.billing.models import CreditAccount
+
+from .models import Team, TeamMember, User
+
+
+class UserSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = User
+        fields = ["id", "username", "first_name", "last_name", "email", "phone", "avatar_url", "status"]
+        read_only_fields = ["id", "status"]
+
+
+class TeamSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = Team
+        fields = ["id", "name", "status", "owner", "created_at", "updated_at"]
+        read_only_fields = ["id", "status", "owner", "created_at", "updated_at"]
+
+
+class TeamMemberSerializer(serializers.ModelSerializer):
+    user = UserSerializer(read_only=True)
+
+    class Meta:
+        model = TeamMember
+        fields = ["id", "team", "user", "role", "status", "monthly_credit_limit"]
+        read_only_fields = ["id", "team", "user", "status"]
+
+
+class RegisterSerializer(serializers.Serializer):
+    username = serializers.CharField(max_length=150)
+    password = serializers.CharField(min_length=8, write_only=True)
+    email = serializers.EmailField(required=False, allow_blank=True)
+    team_name = serializers.CharField(max_length=128, required=False, allow_blank=True)
+
+    def validate_username(self, value):
+        if User.objects.filter(username=value).exists():
+            raise serializers.ValidationError("username already exists")
+        return value
+
+    def create(self, validated_data):
+        from decimal import Decimal
+
+        from django.conf import settings
+        from django.db import transaction
+
+        with transaction.atomic():
+            user = User.objects.create_user(
+                username=validated_data["username"],
+                password=validated_data["password"],
+                email=validated_data.get("email", ""),
+            )
+            team = Team.objects.create(
+                name=validated_data.get("team_name") or f"{user.username}'s Team",
+                owner=user,
+            )
+            TeamMember.objects.create(team=team, user=user, role=TeamMember.Role.OWNER)
+            CreditAccount.objects.create(
+                team=team,
+                balance=Decimal(str(settings.DEFAULT_TRIAL_CREDITS)),
+            )
+        return {"user": user, "team": team}
+
+
+class LoginSerializer(serializers.Serializer):
+    username = serializers.CharField()
+    password = serializers.CharField(write_only=True)