84 lines
2.6 KiB
TypeScript
84 lines
2.6 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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const SUFFIX = Buffer.from([td.CURRENT_VERSION, td.PERSISTENT_ID_VERSION])
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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 File ID
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*
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* @param location Information about file location
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*/
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export function toFileId(
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location: Omit<td.RawFullRemoteFileLocation, '_'>
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): string {
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const loc = location.location
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let type: number = location.type
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if (loc._ === 'web') type |= td.WEB_LOCATION_FLAG
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if (location.fileReference) type |= td.FILE_REFERENCE_FLAG
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const writer = BinaryWriter.alloc(
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loc._ === 'web'
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? // overhead of the web file id:
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// 8-16 bytes header,
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// 8 bytes for access hash,
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// up to 4 bytes for url
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Buffer.byteLength(loc.url, 'utf8') + 32
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: // longest file ids are around 80 bytes, so i guess
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// we are safe with allocating 100 bytes
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100
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)
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writer.int32(type)
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writer.int32(location.dcId)
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if (location.fileReference) {
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writer.bytes(location.fileReference)
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}
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switch (loc._) {
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case 'web':
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writer.string(loc.url)
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writer.long(loc.accessHash)
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break
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case 'photo':
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writer.long(loc.id)
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writer.long(loc.accessHash)
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writer.long(loc.volumeId)
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switch (loc.source._) {
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case 'legacy':
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writer.int32(0)
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writer.long(loc.source.secret)
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break
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case 'thumbnail':
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writer.int32(1)
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writer.int32(loc.source.fileType)
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writer.int32(loc.source.thumbnailType.charCodeAt(0))
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break
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case 'dialogPhoto':
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writer.int32(loc.source.big ? 3 : 2)
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writer.long(loc.source.id)
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writer.long(loc.source.accessHash)
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break
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case 'stickerSetThumbnail':
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writer.int32(4)
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writer.long(loc.source.id)
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writer.long(loc.source.accessHash)
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break
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}
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writer.int32(loc.localId)
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break
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case 'common':
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writer.long(loc.id)
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writer.long(loc.accessHash)
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break
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}
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return encodeUrlSafeBase64(
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Buffer.concat([telegramRleEncode(writer.result()), SUFFIX])
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)
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}
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