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/fileid/from.go

@@ -0,0 +1,81 @@
+package fileid
+
+import (
+	"go.mau.fi/mautrix-telegram/pkg/gotd/constant"
+	"go.mau.fi/mautrix-telegram/pkg/gotd/tg"
+)
+
+// FromDocument creates FileID from tg.Document.
+func FromDocument(doc *tg.Document) FileID {
+	fileID := FileID{
+		Type:          DocumentAsFile,
+		DC:            doc.DCID,
+		ID:            doc.ID,
+		AccessHash:    doc.AccessHash,
+		FileReference: doc.FileReference,
+	}
+	for _, attr := range doc.Attributes {
+		switch attr := attr.(type) {
+		case *tg.DocumentAttributeAnimated:
+			fileID.Type = Animation
+		case *tg.DocumentAttributeSticker:
+			fileID.Type = Sticker
+		case *tg.DocumentAttributeVideo:
+			fileID.Type = Video
+			if attr.RoundMessage {
+				fileID.Type = VideoNote
+			}
+		case *tg.DocumentAttributeAudio:
+			fileID.Type = Audio
+			if attr.Voice {
+				fileID.Type = Voice
+			}
+		}
+	}
+	return fileID
+}
+
+// FromPhoto creates FileID from tg.Photo.
+func FromPhoto(photo *tg.Photo, thumbType rune) FileID {
+	return FileID{
+		Type:          Photo,
+		DC:            photo.DCID,
+		ID:            photo.ID,
+		AccessHash:    photo.AccessHash,
+		FileReference: photo.FileReference,
+		PhotoSizeSource: PhotoSizeSource{
+			Type:          PhotoSizeSourceThumbnail,
+			FileType:      Photo,
+			ThumbnailType: thumbType,
+		},
+	}
+}
+
+// ChatPhoto is interface for user profile photo and chat photo structures.
+type ChatPhoto interface {
+	GetDCID() int
+	GetPhotoID() int64
+}
+
+var _ = []ChatPhoto{
+	(*tg.ChatPhoto)(nil),
+	(*tg.UserProfilePhoto)(nil),
+}
+
+// FromChatPhoto creates new FileID from ChatPhoto.
+func FromChatPhoto(id constant.TDLibPeerID, accessHash int64, photo ChatPhoto, big bool) FileID {
+	typ := PhotoSizeSourceDialogPhotoSmall
+	if big {
+		typ = PhotoSizeSourceDialogPhotoBig
+	}
+	return FileID{
+		Type: ProfilePhoto,
+		DC:   photo.GetDCID(),
+		ID:   photo.GetPhotoID(),
+		PhotoSizeSource: PhotoSizeSource{
+			Type:             typ,
+			DialogID:         id,
+			DialogAccessHash: accessHash,
+		},
+	}
+}