profiles: get online status if friend

profiles/serializers.py

@@ -10,10 +10,30 @@ class ProfileSerializer(serializers.ModelSerializer):
 
     username = serializers.ReadOnlyField(source='user.username')
     avatar = serializers.ImageField(required=False)
+    online = serializers.SerializerMethodField()
 
     class Meta:
         model = ProfileModel
-        fields = ["username", "avatar", "id"]
+        fields = ["username", "avatar", "id", 'online']
+
+    def get_online(self, obj: ProfileModel):
+        from notice.consumers import notice_manager
+
+        user = None
+        request = self.context.get("request")
+        if request and hasattr(request, "user"):
+            user = request.user
+
+        if user is None:
+            return False
+
+        if user.pk == obj.pk:
+            return True
+
+        if not user.profilemodel.is_friend(obj):
+            return None
+
+        return notice_manager.get_consumer_by_user(obj.user) is not None
 
     def validate_avatar(self, value):
         '''