Add ThreadABC helper, that'll contain functions that threads can call

fbchat/__init__.py

@@ -14,7 +14,7 @@ from . import _core, _util
 from ._core import Image
 from ._exception import FBchatException, FBchatFacebookError
 from ._session import Session
-from ._thread import ThreadType, ThreadLocation, ThreadColor, Thread
+from ._thread import ThreadType, ThreadLocation, ThreadColor, ThreadABC, Thread
 from ._user import TypingStatus, User, ActiveStatus
 from ._group import Group
 from ._page import Page

fbchat/_client.py

@@ -108,11 +108,6 @@ class Client:
     FETCH METHODS
     """
 
-    def _forced_fetch(self, thread_id, mid):
-        params = {"thread_and_message_id": {"thread_id": thread_id, "message_id": mid}}
-        (j,) = self.graphql_requests(_graphql.from_doc_id("1768656253222505", params))
-        return j
-
     def fetch_threads(self, thread_location, before=None, after=None, limit=None):
         """Fetch all threads in ``thread_location``.
 
@@ -1820,7 +1815,8 @@ class Client:
                 self.on_unknown_messsage_type(msg=m)
             else:
                 thread_id = str(delta["threadKey"]["threadFbId"])
-                fetch_info = self._forced_fetch(thread_id, mid)
+                thread = Thread(session=self.session, id=thread_id)
+                fetch_info = thread._forced_fetch(mid)
                 fetch_data = fetch_info["message"]
                 author_id = fetch_data["message_sender"]["id"]
                 at = _util.millis_to_datetime(int(fetch_data["timestamp_precise"]))

fbchat/_group.py

@@ -1,13 +1,12 @@
 import attr
 from ._core import attrs_default, Image
-from . import _util, _session, _plan
-from ._thread import Thread
+from . import _util, _session, _plan, _thread
 from typing import Iterable
 
 
 @attrs_default
-class Group(Thread):
-    """Represents a Facebook group. Inherits `Thread`."""
+class Group(_thread.ThreadABC):
+    """Represents a Facebook group. Implements `ThreadABC`."""
 
     #: The session to use when making requests.
     session = attr.ib(type=_session.Session)

fbchat/_page.py

@@ -1,12 +1,11 @@
 import attr
 from ._core import attrs_default, Image
-from . import _session, _plan
-from ._thread import Thread
+from . import _session, _plan, _thread
 
 
 @attrs_default
-class Page(Thread):
-    """Represents a Facebook page. Inherits `Thread`."""
+class Page(_thread.ThreadABC):
+    """Represents a Facebook page. Implements `ThreadABC`."""
 
     #: The session to use when making requests.
     session = attr.ib(type=_session.Session)
@@ -33,6 +32,9 @@ class Page(Thread):
     #: The page's category
     category = attr.ib(None)
 
+    def _to_send_data(self):
+        return {"other_user_fbid": self.id}
+
     @classmethod
     def _from_graphql(cls, session, data):
         if data.get("profile_picture") is None:

fbchat/_thread.py

@@ -1,6 +1,8 @@
+import abc
 import attr
 from ._core import attrs_default, Enum, Image
 from . import _session
+from typing import MutableMapping, Any
 
 
 class ThreadType(Enum):
@@ -68,17 +70,39 @@ class ThreadColor(Enum):
         return cls._extend_if_invalid(value)
 
 
-@attrs_default
-class Thread:
-    """Represents a Facebook thread."""
+class ThreadABC(metaclass=abc.ABCMeta):
+    """Implemented by thread-like classes.
 
-    #: The session to use when making requests.
-    session = attr.ib(type=_session.Session)
-    #: The unique identifier of the thread.
-    id = attr.ib(converter=str)
+    This is private to implement.
+    """
+
+    @property
+    @abc.abstractmethod
+    def session(self) -> _session.Session:
+        """The session to use when making requests."""
+        raise NotImplementedError
+
+    @property
+    @abc.abstractmethod
+    def id(self) -> str:
+        """The unique identifier of the thread."""
+        raise NotImplementedError
+
+    @abc.abstractmethod
+    def _to_send_data(self) -> MutableMapping[str, str]:
+        raise NotImplementedError
+
+    def _forced_fetch(self, message_id: str) -> dict:
+        params = {
+            "thread_and_message_id": {"thread_id": self.id, "message_id": message_id}
+        }
+        (j,) = self.session._graphql_requests(
+            _graphql.from_doc_id("1768656253222505", params)
+        )
+        return j
 
     @staticmethod
-    def _parse_customization_info(data):
+    def _parse_customization_info(data: Any) -> MutableMapping[str, Any]:
         if data is None or data.get("customization_info") is None:
             return {}
         info = data["customization_info"]
@@ -110,6 +134,24 @@ class Thread:
                     rtn["own_nickname"] = pc[1].get("nickname")
         return rtn
 
+
+@attrs_default
+class Thread(ThreadABC):
+    """Represents a Facebook thread, where the actual type is unknown.
+
+    Implements parts of `ThreadABC`, call the method to figure out if your use case is
+    supported. Otherwise, you'll have to use an `User`/`Group`/`Page` object.
+
+    Note: This list may change in minor versions!
+    """
+
+    #: The session to use when making requests.
+    session = attr.ib(type=_session.Session)
+    #: The unique identifier of the thread.
+    id = attr.ib(converter=str)
+
     def _to_send_data(self):
-        # TODO: Only implement this in subclasses
-        return {"other_user_fbid": self.id}
+        raise NotImplementedError(
+            "The method you called is not supported on raw Thread objects."
+            " Please use an appropriate User/Group/Page object instead!"
+        )

fbchat/_user.py

@@ -1,7 +1,6 @@
 import attr
 from ._core import attrs_default, Enum, Image
-from . import _util, _session, _plan
-from ._thread import Thread
+from . import _util, _session, _plan, _thread
 
 
 GENDERS = {
@@ -42,8 +41,8 @@ class TypingStatus(Enum):
 
 
 @attrs_default
-class User(Thread):
-    """Represents a Facebook user. Inherits `Thread`."""
+class User(_thread.ThreadABC):
+    """Represents a Facebook user. Implements `ThreadABC`."""
 
     #: The session to use when making requests.
     session = attr.ib(type=_session.Session)
@@ -80,6 +79,9 @@ class User(Thread):
     #: The default emoji
     emoji = attr.ib(None)
 
+    def _to_send_data(self):
+        return {"other_user_fbid": self.id}
+
     def confirm_friend_request(self):
         """Confirm a friend request, adding the user to your friend list."""
         data = {"to_friend": self.id, "action": "confirm"}

tests/test_thread.py

@@ -1,6 +1,6 @@
 import pytest
 import fbchat
-from fbchat._thread import ThreadType, ThreadColor, Thread
+from fbchat import ThreadType, ThreadColor, ThreadABC, Thread
 
 
 def test_thread_type_to_class():
@@ -19,8 +19,8 @@ def test_thread_color_from_graphql():
 
 
 def test_thread_parse_customization_info_empty():
-    assert {} == Thread._parse_customization_info(None)
-    assert {} == Thread._parse_customization_info({"customization_info": None})
+    assert {} == ThreadABC._parse_customization_info(None)
+    assert {} == ThreadABC._parse_customization_info({"customization_info": None})
 
 
 def test_thread_parse_customization_info_group():
@@ -43,7 +43,7 @@ def test_thread_parse_customization_info_group():
         "color": ThreadColor.BRILLIANT_ROSE,
         "nicknames": {"123456789": "A", "987654321": "B"},
     }
-    assert expected == Thread._parse_customization_info(data)
+    assert expected == ThreadABC._parse_customization_info(data)
 
 
 def test_thread_parse_customization_info_user():
@@ -62,4 +62,9 @@ def test_thread_parse_customization_info_user():
         # ... Other irrelevant fields
     }
     expected = {"emoji": None, "color": None, "own_nickname": "A", "nickname": "B"}
-    assert expected == Thread._parse_customization_info(data)
+    assert expected == ThreadABC._parse_customization_info(data)
+
+
+def test_thread_create_and_implements_thread_abc(session):
+    thread = Thread(session=session, id="123")
+    assert thread._parse_customization_info