84 lines
2.7 KiB
TypeScript
84 lines
2.7 KiB
TypeScript
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import { tdFileId as td } from './types'
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import { BinaryWriter } from '@mtcute/core/src/utils/binary/binary-writer'
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import { encodeUrlSafeBase64, telegramRleEncode } from './utils'
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/**
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* Serialize an object with information about file
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* to TDLib and Bot API compatible Unique File ID
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*
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* Unique File IDs can't be used to download or reuse files,
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* but they are globally unique, meaning that the same file will
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* have the same unique ID regardless of the user who created
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* this ID (unlike normal File IDs, that also contain user-bound
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* file access hash)
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*
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* @param location Information about file location
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*/
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export function toUniqueFileId(
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location: Omit<td.RawFullRemoteFileLocation, '_'>
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): string {
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let type
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if (location.location._ === 'web') {
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type = 0
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} else {
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switch (location.type) {
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case td.FileType.Photo:
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case td.FileType.ProfilePhoto:
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case td.FileType.Thumbnail:
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case td.FileType.EncryptedThumbnail:
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case td.FileType.Wallpaper:
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type = 1
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break
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case td.FileType.Video:
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case td.FileType.VoiceNote:
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case td.FileType.Document:
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case td.FileType.Sticker:
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case td.FileType.Audio:
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case td.FileType.Animation:
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case td.FileType.VideoNote:
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case td.FileType.Background:
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case td.FileType.DocumentAsFile:
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type = 2
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break
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case td.FileType.SecureRaw:
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case td.FileType.Secure:
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type = 3
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break
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case td.FileType.Encrypted:
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type = 4
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break
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case td.FileType.Temp:
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type = 5
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break
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default:
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throw new td.InvalidFileIdError(
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`Invalid file type: ${location.type}`
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)
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}
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}
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let writer: BinaryWriter
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if (location.location._ === 'photo') {
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writer = BinaryWriter.alloc(16)
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writer.int32(type)
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writer.long(location.location.volumeId)
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writer.int32(location.location.localId)
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} else if (location.location._ === 'web') {
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writer = BinaryWriter.alloc(
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Buffer.byteLength(location.location.url, 'utf-8') + 8
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)
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writer.int32(type)
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writer.string(location.location.url)
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} else if (location.location._ === 'common') {
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writer = BinaryWriter.alloc(12)
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writer.int32(type)
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writer.long(location.location.id)
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} else {
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throw new td.UnsupportedError(
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`Unique IDs are not supported for ${(location.location as any)._}`
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)
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}
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return encodeUrlSafeBase64(telegramRleEncode(writer.result()))
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}
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