Adam Van Ymeren
7a04f298d2
- 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
46 lines
1.1 KiB
Go
46 lines
1.1 KiB
Go
package fileid
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import (
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"encoding/base64"
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"github.com/go-faster/errors"
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"go.mau.fi/mautrix-telegram/pkg/gotd/bin"
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)
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const (
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persistentIDVersionOld = 2
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persistentIDVersionMap = 3
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persistentIDVersion = 4
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)
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// DecodeFileID parses FileID from a string.
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func DecodeFileID(s string) (fileID FileID, _ error) {
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if s == "" {
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return FileID{}, errors.New("input is empty")
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}
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data, err := base64Decode(s)
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if err != nil {
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return FileID{}, errors.Wrap(err, "base64")
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}
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data = rleDecode(data)
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if len(data) < 2 {
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return FileID{}, errors.New("RLE-decoded data is too small")
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}
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switch version := data[len(data)-1]; version {
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case persistentIDVersionOld, persistentIDVersionMap:
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return FileID{}, errors.Errorf("%v is unsupported now", version)
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case persistentIDVersion:
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data = data[:len(data)-1]
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err := fileID.decodeLatestFileID(&bin.Buffer{Buf: data})
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return fileID, err
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default:
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return FileID{}, errors.Errorf("unknown file_id version %x", version)
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}
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}
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func base64Decode(s string) ([]byte, error) {
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return base64.RawURLEncoding.DecodeString(s)
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}
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