Sumner Evans
76 lines
2.3 KiB
Go
76 lines
2.3 KiB
Go
package ids
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import (
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"encoding/binary"
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"fmt"
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"maunium.net/go/mautrix/bridgev2/networkid"
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)
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// DirectMediaInfo is the information that is encoded in the media ID when
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// using direct media.
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//
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// The format of the media ID is as follows (each character represents a single
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// byte, |'s added for clarity):
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//
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// v|p|cccccccc|rrrrrrrr|mmmmmmmm|T|MMMMMMMM
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//
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// v (int8) = binary encoding format version. Should be 0.
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// p (byte) = the peer type of the Telegram chat ID
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// cccccccc (int64) = the Telegram chat ID (big endian)
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// rrrrrrrr (int64) = the receiver ID (big endian)
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// mmmmmmmm (int64) = the Telegram message ID (big endian)
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// MMMMMMMM (int64) = the Telegram media ID (big endian)
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// T (byte) = 0 or 1 depending on whether it's a thumbnail
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type DirectMediaInfo struct {
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PeerType PeerType
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ChatID int64
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ReceiverID int64
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MessageID int64
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TelegramMediaID int64
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Thumbnail bool
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}
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func (m DirectMediaInfo) AsMediaID() (networkid.MediaID, error) {
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mediaID := []byte{
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0x00, // Version
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m.PeerType.AsByte(), // Peer Type
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}
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mediaID = binary.BigEndian.AppendUint64(mediaID, uint64(m.ChatID)) // Telegram Chat ID
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mediaID = binary.BigEndian.AppendUint64(mediaID, uint64(m.ReceiverID)) // Telegram Chat ID
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mediaID = binary.BigEndian.AppendUint64(mediaID, uint64(m.MessageID)) // Telegram Message ID
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mediaID = binary.BigEndian.AppendUint64(mediaID, uint64(m.TelegramMediaID)) // Telegram Media ID
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if m.Thumbnail {
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mediaID = append(mediaID, 0x01)
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} else {
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mediaID = append(mediaID, 0x00)
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}
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return mediaID, nil
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}
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func ParseDirectMediaInfo(mediaID networkid.MediaID) (info DirectMediaInfo, err error) {
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if len(mediaID) == 0 {
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err = fmt.Errorf("empty media ID")
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return
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}
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if mediaID[0] != 0x00 {
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err = fmt.Errorf("invalid version %d", mediaID[0])
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return
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}
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if len(mediaID) != 35 {
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err = fmt.Errorf("invalid media ID")
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return
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}
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info.PeerType, err = PeerTypeFromByte(mediaID[1])
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if err != nil {
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return
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}
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info.ChatID = int64(binary.BigEndian.Uint64(mediaID[2:]))
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info.ReceiverID = int64(binary.BigEndian.Uint64(mediaID[10:]))
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info.MessageID = int64(binary.BigEndian.Uint64(mediaID[18:]))
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info.TelegramMediaID = int64(binary.BigEndian.Uint64(mediaID[26:]))
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info.Thumbnail = mediaID[34] == 1
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return
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}
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