move gotd fork into repo. (#111)

- update to latest telegram layer
- remove some references to fields in tg.Entities that don't exist in
the schema
- originally added here:
https://github.com/beeper/td/commit/820929062a2ba0104397bc01235ab58a9cff780e
  - referenced here
-
https://github.com/mautrix/telegramgo/commit/124f0967ed195b5a380c9bd02e170ada9710dde3
-
https://github.com/mautrix/telegramgo/commit/4205047aab2e0639217148b5d125bfaab668bd8e

pkg/gotd/telegram/internal/upconv/doc.go

@@ -0,0 +1,2 @@
+// Package upconv contains updates conversion helpers.
+package upconv

pkg/gotd/telegram/internal/upconv/upconv.go

@@ -0,0 +1,122 @@
+package upconv
+
+import "go.mau.fi/mautrix-telegram/pkg/gotd/tg"
+
+func convertOptional(msg *tg.Message, i tg.UpdatesClass) {
+	if u, ok := i.(interface {
+		GetFwdFrom() (tg.MessageFwdHeader, bool)
+	}); ok {
+		if v, ok := u.GetFwdFrom(); ok {
+			msg.SetFwdFrom(v)
+		}
+	}
+	if u, ok := i.(interface{ GetViaBotID() (int64, bool) }); ok {
+		if v, ok := u.GetViaBotID(); ok {
+			msg.SetViaBotID(v)
+		}
+	}
+	if u, ok := i.(interface {
+		GetReplyTo() (tg.MessageReplyHeader, bool)
+	}); ok {
+		if v, ok := u.GetReplyTo(); ok {
+			msg.SetReplyTo(&v)
+		}
+	}
+	if u, ok := i.(interface {
+		GetReplyTo() (tg.MessageReplyHeaderClass, bool)
+	}); ok {
+		if v, ok := u.GetReplyTo(); ok {
+			msg.SetReplyTo(v)
+		}
+	}
+	if u, ok := i.(interface {
+		GetEntities() ([]tg.MessageEntityClass, bool)
+	}); ok {
+		if v, ok := u.GetEntities(); ok {
+			msg.SetEntities(v)
+		}
+	}
+	if u, ok := i.(interface {
+		GetMedia() (tg.MessageMediaClass, bool)
+	}); ok {
+		if v, ok := u.GetMedia(); ok {
+			msg.SetMedia(v)
+		}
+	}
+}
+
+// ShortMessage converts UpdateShortMessage to UpdateShort.
+func ShortMessage(u *tg.UpdateShortMessage) *tg.UpdateShort {
+	msg := &tg.Message{
+		ID:      u.ID,
+		PeerID:  &tg.PeerUser{UserID: u.UserID},
+		Message: u.Message,
+		Date:    u.Date,
+	}
+	// Optional fields should set by SetXXX(), so GetXXX and Flags.Has()
+	// can return the right values even we hav't call .Encode()
+	msg.SetOut(u.Out)
+	msg.SetMentioned(u.Mentioned)
+	msg.SetMediaUnread(u.MediaUnread)
+	msg.SetSilent(u.Silent)
+
+	if !u.Out {
+		msg.SetFromID(&tg.PeerUser{UserID: u.UserID})
+	}
+	convertOptional(msg, u)
+
+	return &tg.UpdateShort{
+		Update: &tg.UpdateNewMessage{
+			Message:  msg,
+			Pts:      u.Pts,
+			PtsCount: u.PtsCount,
+		},
+		Date: u.Date,
+	}
+}
+
+// ShortChatMessage converts UpdateShortChatMessage to UpdateShort.
+func ShortChatMessage(u *tg.UpdateShortChatMessage) *tg.UpdateShort {
+	msg := &tg.Message{
+		ID:      u.ID,
+		PeerID:  &tg.PeerChat{ChatID: u.ChatID},
+		Message: u.Message,
+		Date:    u.Date,
+	}
+
+	msg.SetFromID(&tg.PeerUser{UserID: u.FromID})
+	msg.SetOut(u.Out)
+	msg.SetMentioned(u.Mentioned)
+	msg.SetMediaUnread(u.MediaUnread)
+	msg.SetSilent(u.Silent)
+
+	convertOptional(msg, u)
+
+	return &tg.UpdateShort{
+		Update: &tg.UpdateNewMessage{
+			Message:  msg,
+			Pts:      u.Pts,
+			PtsCount: u.PtsCount,
+		},
+		Date: u.Date,
+	}
+}
+
+// ShortSentMessage converts UpdateShortSentMessage to UpdateShort.
+func ShortSentMessage(u *tg.UpdateShortSentMessage) *tg.UpdateShort {
+	msg := &tg.Message{
+		ID:   u.ID,
+		Date: u.Date,
+	}
+	msg.SetOut(u.Out)
+	convertOptional(msg, u)
+
+	return &tg.UpdateShort{
+		Update: &tg.UpdateNewMessage{
+			Message:  msg,
+			Pts:      u.Pts,
+			PtsCount: u.PtsCount,
+		},
+		Date: u.Date,
+	}
+}