Work towards dialogs and drafts

client/doc/concepts/messages.rst

@@ -73,6 +73,29 @@ To send a message with formatted text, use the ``markdown`` or ``html`` paramete
 When sending files, the format is appended to the name of the ``caption`` parameter, either ``caption_markdown`` or ``caption_html``.
 
 
+Link previews
+^^^^^^^^^^^^^
+
+Link previews are treated as a type of media automatically generated by Telegram.
+This means you cannot have both a link preview and other media in the same message.
+
+The ``link_preview`` parameter indicates whether link previews are *allowed* to be present.
+If Telegram is unable to generate a link preview for any of the links, there won't be a link preview.
+
+By default, link previews are not enabled.
+This is done to prevent sending things you did not explicitly intend to send.
+Unlike the official clients, which do not have a GUI to "enable" the preview, you can easily enable them from code.
+
+Telegram will attempt to generate a preview for all links contained in the message in order.
+You can use this to your advantage, and hide a link to a photo in the first space or invisible character like ``'\u2063'``.
+Note that avid users *will* be able to find out the link. It is not secret!
+
+Link previews of photos won't show under the photos of the chat,
+but it requires a server hosting the image, a public address, and Telegram to be able to generate a preview.
+
+To regenerate a preview, send the corresponding link to `@WebpageBot <https://t.me/WebpageBot>`_.
+
+
 Message identifiers
 -------------------
 

client/src/telethon/_impl/client/client/client.py

@@ -70,7 +70,7 @@ from .chats import (
     set_banned_rights,
     set_default_rights,
 )
-from .dialogs import delete_dialog, get_dialogs, get_drafts
+from .dialogs import delete_dialog, edit_draft, get_dialogs, get_drafts
 from .files import (
     download,
     get_file_bytes,
@@ -499,7 +499,7 @@ class Client:
         text: Optional[str] = None,
         markdown: Optional[str] = None,
         html: Optional[str] = None,
-        link_preview: Optional[bool] = None,
+        link_preview: bool = False,
     ) -> Message:
         """
         Edit a message.
@@ -1247,6 +1247,7 @@ class Client:
         title: Optional[str] = None,
         performer: Optional[str] = None,
         emoji: Optional[str] = None,
+        emoji_sticker: Optional[str] = None,
         width: Optional[int] = None,
         height: Optional[int] = None,
         round: bool = False,
@@ -1396,6 +1397,7 @@ class Client:
             title=title,
             performer=performer,
             emoji=emoji,
+            emoji_sticker=emoji_sticker,
             width=width,
             height=height,
             round=round,
@@ -1425,14 +1427,7 @@ class Client:
         :param text: See :ref:`formatting`.
         :param markdown: See :ref:`formatting`.
         :param html: See :ref:`formatting`.
-
+        :param link_preview: See :ref:`formatting`.
-        :param link_preview:
-            Whether the link preview is allowed.
-
-            Setting this to :data:`True` does not guarantee a preview.
-            Telegram must be able to generate a preview from the first link in the message text.
-
-            To regenerate the preview, send the link to `@WebpageBot <https://t.me/WebpageBot>`_.
 
         :param reply_to:
             The message identifier of the message to reply to.
@@ -1578,6 +1573,58 @@ class Client:
     def set_default_rights(self, chat: ChatLike, user: ChatLike) -> None:
         set_default_rights(self, chat, user)
 
+    async def edit_draft(
+        self,
+        chat: ChatLike,
+        text: Optional[str] = None,
+        *,
+        markdown: Optional[str] = None,
+        html: Optional[str] = None,
+        link_preview: bool = False,
+        reply_to: Optional[int] = None,
+    ) -> Draft:
+        """
+        Set a draft message in a chat.
+
+        This can also be used to clear the draft by setting the text to an empty string ``""``.
+
+        :param chat:
+            The :term:`chat` where the draft will be saved to.
+
+        :param text: See :ref:`formatting`.
+        :param markdown: See :ref:`formatting`.
+        :param html: See :ref:`formatting`.
+        :param link_preview: See :ref:`formatting`.
+
+        :param reply_to:
+            The message identifier of the message to reply to.
+
+        :return: The created draft.
+
+        .. rubric:: Example
+
+        .. code-block:: python
+
+            # Edit message to have text without formatting
+            await client.edit_message(chat, msg_id, text='New text')
+
+            # Remove the link preview without changing the text
+            await client.edit_message(chat, msg_id, link_preview=False)
+
+        .. seealso::
+
+            :meth:`telethon.types.Message.edit`
+        """
+        return await edit_draft(
+            self,
+            chat,
+            text,
+            markdown=markdown,
+            html=html,
+            link_preview=link_preview,
+            reply_to=reply_to,
+        )
+
     def set_handler_filter(
         self,
         handler: Callable[[Event], Awaitable[Any]],

client/src/telethon/_impl/client/client/dialogs.py

@@ -1,10 +1,12 @@
 from __future__ import annotations
 
-from typing import TYPE_CHECKING
+import time
+from typing import TYPE_CHECKING, Optional
 
 from ...tl import functions, types
 from ..types import AsyncList, ChatLike, Dialog, Draft
-from ..utils import build_chat_map
+from ..utils import build_chat_map, build_msg_map
+from .messages import parse_message
 
 if TYPE_CHECKING:
     from .client import Client
@@ -40,8 +42,11 @@ class DialogList(AsyncList[Dialog]):
         assert isinstance(result, (types.messages.Dialogs, types.messages.DialogsSlice))
 
         chat_map = build_chat_map(result.users, result.chats)
+        msg_map = build_msg_map(self._client, result.messages, chat_map)
 
-        self._buffer.extend(Dialog._from_raw(d, chat_map) for d in result.dialogs)
+        self._buffer.extend(
+            Dialog._from_raw(self._client, d, chat_map, msg_map) for d in result.dialogs
+        )
 
 
 def get_dialogs(self: Client) -> AsyncList[Dialog]:
@@ -93,7 +98,7 @@ class DraftList(AsyncList[Draft]):
         chat_map = build_chat_map(result.users, result.chats)
 
         self._buffer.extend(
-            Draft._from_raw(u, chat_map)
+            Draft._from_raw_update(self._client, u, chat_map)
             for u in result.updates
             if isinstance(u, types.UpdateDraftMessage)
         )
@@ -104,3 +109,47 @@ class DraftList(AsyncList[Draft]):
 
 def get_drafts(self: Client) -> AsyncList[Draft]:
     return DraftList(self)
+
+
+async def edit_draft(
+    self: Client,
+    chat: ChatLike,
+    text: Optional[str] = None,
+    *,
+    markdown: Optional[str] = None,
+    html: Optional[str] = None,
+    link_preview: bool = False,
+    reply_to: Optional[int] = None,
+) -> Draft:
+    packed = await self._resolve_to_packed(chat)
+    peer = (await self._resolve_to_packed(chat))._to_input_peer()
+    message, entities = parse_message(
+        text=text, markdown=markdown, html=html, allow_empty=False
+    )
+    assert isinstance(message, str)
+
+    result = await self(
+        functions.messages.save_draft(
+            no_webpage=not link_preview,
+            reply_to_msg_id=reply_to,
+            top_msg_id=None,
+            peer=peer,
+            message=message,
+            entities=entities,
+        )
+    )
+    assert result
+
+    return Draft._from_raw(
+        client=self,
+        peer=packed._to_peer(),
+        top_msg_id=0,
+        draft=types.DraftMessage(
+            no_webpage=not link_preview,
+            reply_to_msg_id=reply_to,
+            message=message,
+            entities=entities,
+            date=int(time.time()),
+        ),
+        chat_map={},
+    )

client/src/telethon/_impl/client/client/messages.py

@@ -46,7 +46,7 @@ async def send_message(
     *,
     markdown: Optional[str] = None,
     html: Optional[str] = None,
-    link_preview: Optional[bool] = None,
+    link_preview: bool = False,
     reply_to: Optional[int] = None,
 ) -> Message:
     packed = await self._resolve_to_packed(chat)
@@ -99,51 +99,29 @@ async def send_message(
         )
     )
     if isinstance(result, types.UpdateShortSentMessage):
-        return Message._from_raw(
+        return Message._from_defaults(
             self,
-            types.Message(
-                out=result.out,
-                mentioned=False,
-                media_unread=False,
-                silent=False,
-                post=False,
-                from_scheduled=False,
-                legacy=False,
-                edit_hide=False,
-                pinned=False,
-                noforwards=False,
-                id=result.id,
-                from_id=types.PeerUser(user_id=self._session.user.id)
-                if self._session.user
-                else None,
-                peer_id=packed._to_peer(),
-                fwd_from=None,
-                via_bot_id=None,
-                reply_to=types.MessageReplyHeader(
-                    reply_to_scheduled=False,
-                    forum_topic=False,
-                    reply_to_msg_id=reply_to,
-                    reply_to_peer_id=None,
-                    reply_to_top_id=None,
-                )
-                if reply_to
-                else None,
-                date=result.date,
-                message=message if isinstance(message, str) else (message.text or ""),
-                media=result.media,
-                reply_markup=None,
-                entities=result.entities,
-                views=None,
-                forwards=None,
-                replies=None,
-                edit_date=None,
-                post_author=None,
-                grouped_id=None,
-                reactions=None,
-                restriction_reason=None,
-                ttl_period=result.ttl_period,
-            ),
             {},
+            out=result.out,
+            id=result.id,
+            from_id=types.PeerUser(user_id=self._session.user.id)
+            if self._session.user
+            else None,
+            peer_id=packed._to_peer(),
+            reply_to=types.MessageReplyHeader(
+                reply_to_scheduled=False,
+                forum_topic=False,
+                reply_to_msg_id=reply_to,
+                reply_to_peer_id=None,
+                reply_to_top_id=None,
+            )
+            if reply_to
+            else None,
+            date=result.date,
+            message=message if isinstance(message, str) else (message.text or ""),
+            media=result.media,
+            entities=result.entities,
+            ttl_period=result.ttl_period,
         )
     else:
         return self._build_message_map(result, peer).with_random_id(random_id)
@@ -157,7 +135,7 @@ async def edit_message(
     text: Optional[str] = None,
     markdown: Optional[str] = None,
     html: Optional[str] = None,
-    link_preview: Optional[bool] = None,
+    link_preview: bool = False,
 ) -> Message:
     peer = (await self._resolve_to_packed(chat))._to_input_peer()
     message, entities = parse_message(

client/src/telethon/_impl/client/types/chat/group.py

@@ -52,7 +52,7 @@ class Group(Chat, metaclass=NoPublicConstructor):
 
         This property is always present, but may be the empty string.
         """
-        return self._raw.title
+        return getattr(self._raw, "title", None) or ""
 
     @property
     def username(self) -> Optional[str]:

client/src/telethon/_impl/client/types/dialog.py

@@ -1,9 +1,17 @@
-from typing import Dict, Self
+from __future__ import annotations
 
-from ...tl import abcs
+from typing import TYPE_CHECKING, Dict, Optional, Self, Union
+
+from ...tl import abcs, types
+from ..utils import peer_id
 from .chat import Chat
+from .draft import Draft
+from .message import Message
 from .meta import NoPublicConstructor
 
+if TYPE_CHECKING:
+    from ..client import Client
+
 
 class Dialog(metaclass=NoPublicConstructor):
     """
@@ -16,12 +24,76 @@ class Dialog(metaclass=NoPublicConstructor):
     You can obtain dialogs with methods such as :meth:`telethon.Client.get_dialogs`.
     """
 
-    __slots__ = ("_raw", "_chat_map")
+    def __init__(
-
+        self,
-    def __init__(self, raw: abcs.Dialog, chat_map: Dict[int, Chat]) -> None:
+        client: Client,
+        raw: Union[types.Dialog, types.DialogFolder],
+        chat_map: Dict[int, Chat],
+        msg_map: Dict[int, Message],
+    ) -> None:
+        self._client = client
         self._raw = raw
         self._chat_map = chat_map
+        self._msg_map = msg_map
 
     @classmethod
-    def _from_raw(cls, dialog: abcs.Dialog, chat_map: Dict[int, Chat]) -> Self:
+    def _from_raw(
-        return cls._create(dialog, chat_map)
+        cls,
+        client: Client,
+        dialog: abcs.Dialog,
+        chat_map: Dict[int, Chat],
+        msg_map: Dict[int, Message],
+    ) -> Self:
+        assert isinstance(dialog, (types.Dialog, types.DialogFolder))
+        return cls._create(client, dialog, chat_map, msg_map)
+
+    @property
+    def chat(self) -> Chat:
+        """
+        The chat where messages are sent in this dialog.
+        """
+        return self._chat_map[peer_id(self._raw.peer)]
+
+    @property
+    def draft(self) -> Optional[Draft]:
+        """
+        The message draft within this dialog, if any.
+
+        This property does not update when the draft changes.
+        """
+        if isinstance(self._raw, types.Dialog) and self._raw.draft:
+            return Draft._from_raw(
+                self._client,
+                self._raw.peer,
+                self._raw.top_message,
+                self._raw.draft,
+                self._chat_map,
+            )
+        else:
+            return None
+
+    @property
+    def latest_message(self) -> Optional[Message]:
+        """
+        The latest message sent or received in this dialog, if any.
+
+        This property does not update when new messages arrive.
+        """
+        return self._msg_map.get(self._raw.top_message)
+
+    @property
+    def unread_count(self) -> int:
+        """
+        The amount of unread messages in this dialog.
+
+        This property does not update when messages are read or sent.
+        """
+        if isinstance(self._raw, types.Dialog):
+            return self._raw.unread_count
+        elif isinstance(self._raw, types.DialogPeerFolder):
+            return (
+                self._raw.unread_unmuted_messages_count
+                + self._raw.unread_muted_messages_count
+            )
+        else:
+            raise RuntimeError("unexpected case")

client/src/telethon/_impl/client/types/draft.py

@@ -1,9 +1,19 @@
-from typing import Dict, Self
+from __future__ import annotations
 
-from ...tl import types
+import datetime
+from typing import TYPE_CHECKING, Dict, Optional, Self
+
+from ...session import PackedChat
+from ...tl import abcs, functions, types
+from ..parsers import generate_html_message, generate_markdown_message
+from ..utils import expand_peer, generate_random_id, peer_id
 from .chat import Chat
+from .message import Message
 from .meta import NoPublicConstructor
 
+if TYPE_CHECKING:
+    from ..client import Client
+
 
 class Draft(metaclass=NoPublicConstructor):
     """
@@ -12,19 +22,226 @@ class Draft(metaclass=NoPublicConstructor):
     You can obtain drafts with methods such as :meth:`telethon.Client.get_drafts`.
     """
 
-    __slots__ = ("_raw", "_chat_map")
-
     def __init__(
-        self, raw: types.UpdateDraftMessage, chat_map: Dict[int, Chat]
+        self,
+        client: Client,
+        peer: abcs.Peer,
+        top_msg_id: Optional[int],
+        raw: abcs.DraftMessage,
+        chat_map: Dict[int, Chat],
     ) -> None:
+        assert isinstance(raw, (types.DraftMessage, types.DraftMessageEmpty))
+        self._client = client
+        self._peer = peer
         self._raw = raw
+        self._top_msg_id = top_msg_id
         self._chat_map = chat_map
 
     @classmethod
-    def _from_raw(
+    def _from_raw_update(
-        cls, draft: types.UpdateDraftMessage, chat_map: Dict[int, Chat]
+        cls, client: Client, draft: types.UpdateDraftMessage, chat_map: Dict[int, Chat]
     ) -> Self:
-        return cls._create(draft, chat_map)
+        return cls._create(client, draft.peer, draft.top_msg_id, draft.draft, chat_map)
+
+    @classmethod
+    def _from_raw(
+        cls,
+        client: Client,
+        peer: abcs.Peer,
+        top_msg_id: int,
+        draft: abcs.DraftMessage,
+        chat_map: Dict[int, Chat],
+    ) -> Self:
+        return cls._create(client, peer, top_msg_id, draft, chat_map)
+
+    @property
+    def chat(self) -> Chat:
+        """
+        The chat where the draft will be sent to.
+        """
+        return self._chat_map.get(peer_id(self._peer)) or expand_peer(
+            self._peer, broadcast=None
+        )
+
+    @property
+    def link_preview(self) -> bool:
+        """
+        :data:`True` if the link preview is allowed to exist when sending the message.
+        """
+        return not getattr(self._raw, "no_webpage", False)
+
+    @property
+    def replied_message_id(self) -> Optional[int]:
+        """
+        Get the message identifier of message this draft will reply to once sent.
+        """
+        return getattr(self._raw, "reply_to_msg_id") or None
+
+    @property
+    def text(self) -> Optional[str]:
+        """
+        The :attr:`~Message.text` of the message that will be sent.
+        """
+        return getattr(self._raw, "message", None)
+
+    @property
+    def text_html(self) -> Optional[str]:
+        """
+        The :attr:`~Message.text_html` of the message that will be sent.
+        """
+        if text := getattr(self._raw, "message", None):
+            return generate_html_message(
+                text, getattr(self._raw, "entities", None) or []
+            )
+        else:
+            return None
+
+    @property
+    def text_markdown(self) -> Optional[str]:
+        """
+        The :attr:`~Message.text_markdown` of the message that will be sent.
+        """
+        if text := getattr(self._raw, "message", None):
+            return generate_markdown_message(
+                text, getattr(self._raw, "entities", None) or []
+            )
+        else:
+            return None
+
+    @property
+    def date(self) -> Optional[datetime.datetime]:
+        """
+        The date when the draft was last updated.
+        """
+        date = getattr(self._raw, "date", None)
+        return (
+            datetime.datetime.fromtimestamp(date, tz=datetime.timezone.utc)
+            if date is not None
+            else None
+        )
+
+    async def edit(
+        self,
+        text: Optional[str] = None,
+        *,
+        markdown: Optional[str] = None,
+        html: Optional[str] = None,
+        link_preview: bool = False,
+        reply_to: Optional[int] = None,
+    ) -> Draft:
+        """
+        Replace the current draft with a new one.
+
+        :param text: See :ref:`formatting`.
+        :param markdown: See :ref:`formatting`.
+        :param html: See :ref:`formatting`.
+        :param link_preview: See :ref:`formatting`.
+
+        :param reply_to:
+            The message identifier of the message to reply to.
+
+        :return: The edited draft.
+
+        .. rubric:: Example
+
+        .. code-block:: python
+
+            new_draft = await old_draft.edit('new text', link_preview=False)
+        """
+        return await self._client.edit_draft(
+            await self._packed_chat(),
+            text,
+            markdown=markdown,
+            html=html,
+            link_preview=link_preview,
+            reply_to=reply_to,
+        )
+
+    async def _packed_chat(self) -> PackedChat:
+        packed = None
+        if chat := self._chat_map.get(peer_id(self._peer)):
+            packed = chat.pack()
+        if packed is None:
+            packed = await self._client.resolve_to_packed(peer_id(self._peer))
+        return packed
+
+    async def send(self) -> Message:
+        """
+        Send the contents of this draft to the chat.
+
+        The draft will be cleared after being sent.
+
+        :return: The sent message.
+
+        .. rubric:: Example
+
+        .. code-block:: python
+
+            await draft.send(clear=False)
+        """
+
+        packed = await self._packed_chat()
+        peer = packed._to_input_peer()
+
+        reply_to = self.replied_message_id
+        message = getattr(self._raw, "message", "")
+        entities = getattr(self._raw, "entities", None)
+        random_id = generate_random_id()
+
+        result = await self._client(
+            functions.messages.send_message(
+                no_webpage=not self.link_preview,
+                silent=False,
+                background=False,
+                clear_draft=True,
+                noforwards=False,
+                update_stickersets_order=False,
+                peer=peer,
+                reply_to=types.InputReplyToMessage(
+                    reply_to_msg_id=reply_to, top_msg_id=None
+                )
+                if reply_to
+                else None,
+                message=message,
+                random_id=random_id,
+                reply_markup=None,
+                entities=entities,
+                schedule_date=None,
+                send_as=None,
+            )
+        )
+        if isinstance(result, types.UpdateShortSentMessage):
+            return Message._from_defaults(
+                self._client,
+                {},
+                out=result.out,
+                id=result.id,
+                from_id=types.PeerUser(user_id=self._client._session.user.id)
+                if self._client._session.user
+                else None,
+                peer_id=packed._to_peer(),
+                reply_to=types.MessageReplyHeader(
+                    reply_to_scheduled=False,
+                    forum_topic=False,
+                    reply_to_msg_id=reply_to,
+                    reply_to_peer_id=None,
+                    reply_to_top_id=None,
+                )
+                if reply_to
+                else None,
+                date=result.date,
+                message=message,
+                media=result.media,
+                entities=result.entities,
+                ttl_period=result.ttl_period,
+            )
+        else:
+            return self._client._build_message_map(result, peer).with_random_id(
+                random_id
+            )
 
     async def delete(self) -> None:
-        pass
+        """
+        Clear the contents of this draft to delete it.
+        """
+        await self.edit("")

client/src/telethon/_impl/client/types/message.py

@@ -1,11 +1,11 @@
 from __future__ import annotations
 
 import datetime
-from typing import TYPE_CHECKING, Dict, Optional, Self, Union
+from typing import TYPE_CHECKING, Any, Dict, Optional, Self, Union
 
 from ...tl import abcs, types
 from ..parsers import generate_html_message, generate_markdown_message
-from ..utils import expand_peer, peer_id
+from ..utils import adapt_date, expand_peer, peer_id
 from .chat import Chat, ChatLike
 from .file import File
 from .meta import NoPublicConstructor
@@ -40,6 +40,52 @@ class Message(metaclass=NoPublicConstructor):
     ) -> Self:
         return cls._create(client, message, chat_map)
 
+    @classmethod
+    def _from_defaults(
+        cls,
+        client: Client,
+        chat_map: Dict[int, Chat],
+        id: int,
+        peer_id: abcs.Peer,
+        date: int,
+        message: str,
+        **kwargs: Any,
+    ) -> Self:
+        default_kwargs: Dict[str, Any] = {
+            "out": False,
+            "mentioned": False,
+            "media_unread": False,
+            "silent": False,
+            "post": False,
+            "from_scheduled": False,
+            "legacy": False,
+            "edit_hide": False,
+            "pinned": False,
+            "noforwards": False,
+            "id": id,
+            "from_id": None,
+            "peer_id": peer_id,
+            "fwd_from": None,
+            "via_bot_id": None,
+            "reply_to": None,
+            "date": date,
+            "message": message,
+            "media": None,
+            "reply_markup": None,
+            "entities": None,
+            "views": None,
+            "forwards": None,
+            "replies": None,
+            "edit_date": None,
+            "post_author": None,
+            "grouped_id": None,
+            "reactions": None,
+            "restriction_reason": None,
+            "ttl_period": None,
+        }
+        default_kwargs.update(kwargs)
+        return cls._create(client, types.Message(**default_kwargs), chat_map)
+
     @property
     def id(self) -> int:
         """
@@ -86,12 +132,7 @@ class Message(metaclass=NoPublicConstructor):
 
     @property
     def date(self) -> Optional[datetime.datetime]:
-        date = getattr(self._raw, "date", None)
+        return adapt_date(getattr(self._raw, "date", None))
-        return (
-            datetime.datetime.fromtimestamp(date, tz=datetime.timezone.utc)
-            if date is not None
-            else None
-        )
 
     @property
     def chat(self) -> Chat:
@@ -236,7 +277,7 @@ class Message(metaclass=NoPublicConstructor):
         text: Optional[str] = None,
         markdown: Optional[str] = None,
         html: Optional[str] = None,
-        link_preview: Optional[bool] = None,
+        link_preview: bool = False,
     ) -> Message:
         """
         Alias for :meth:`telethon.Client.edit_message`.

client/src/telethon/_impl/client/utils.py

@@ -1,11 +1,17 @@
+from __future__ import annotations
+
+import datetime
 import itertools
 import sys
 import time
 from collections import defaultdict
-from typing import DefaultDict, Dict, List, Optional, Union
+from typing import TYPE_CHECKING, DefaultDict, Dict, List, Optional, Union
 
 from ..tl import abcs, types
-from .types import Channel, Chat, Group, User
+from .types import Channel, Chat, Group, Message, User
+
+if TYPE_CHECKING:
+    from .client import Client
 
 _last_id = 0
 
@@ -51,6 +57,15 @@ def build_chat_map(users: List[abcs.User], chats: List[abcs.Chat]) -> Dict[int,
     return result
 
 
+def build_msg_map(
+    client: Client, messages: List[abcs.Message], chat_map: Dict[int, Chat]
+) -> Dict[int, Message]:
+    return {
+        msg.id: msg
+        for msg in (Message._from_raw(client, m, chat_map) for m in messages)
+    }
+
+
 def peer_id(peer: abcs.Peer) -> int:
     if isinstance(peer, types.PeerUser):
         return peer.user_id
@@ -83,3 +98,11 @@ def expand_peer(peer: abcs.Peer, *, broadcast: Optional[bool]) -> Chat:
         return Channel._from_raw(channel) if broadcast else Group._from_raw(channel)
     else:
         raise RuntimeError("unexpected case")
+
+
+def adapt_date(date: Optional[int]) -> Optional[datetime.datetime]:
+    return (
+        datetime.datetime.fromtimestamp(date, tz=datetime.timezone.utc)
+        if date is not None
+        else None
+    )

client/src/telethon/_impl/mtproto/mtp/encrypted.py

@@ -208,7 +208,7 @@ class Encrypted(Mtp):
         )
 
         if self._msg_count == 1:
-            container_msg_id = Single
+            container_msg_id: Union[Type[Single], int] = Single
         else:
             container_msg_id = self._get_new_msg_id()
             self._buffer[HEADER_LEN : HEADER_LEN + CONTAINER_HEADER_LEN] = struct.pack(