113 lines
3.9 KiB
TypeScript
113 lines
3.9 KiB
TypeScript
import { base64, u8, utf8 } from '@fuman/utils'
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import { TlBinaryWriter } from '@mtcute/tl-runtime'
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import { tdFileId as td } from './types.js'
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import { assertNever, telegramRleEncode } from './utils.js'
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const SUFFIX = new Uint8Array([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(location: Omit<td.RawFullRemoteFileLocation, '_'>): 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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// 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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//
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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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const writer = TlBinaryWriter.manual(loc._ === 'web' ? utf8.encodedLength(loc.url) + 32 : 100)
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writer.int(type)
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writer.int(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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// todo: check how tdlib handles volume ids
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writer.long(loc.id)
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writer.long(loc.accessHash)
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switch (loc.source._) {
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case 'legacy':
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writer.int(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.int(1)
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writer.int(loc.source.fileType)
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writer.int(loc.source.thumbnailType.charCodeAt(0))
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break
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case 'dialogPhoto':
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writer.int(loc.source.big ? 3 : 2)
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writer.int53(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.int(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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case 'fullLegacy':
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writer.int(5)
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writer.long(loc.source.volumeId)
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writer.long(loc.source.secret)
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writer.int(loc.source.localId)
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break
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case 'dialogPhotoLegacy':
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writer.int(loc.source.big ? 7 : 6)
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writer.int53(loc.source.id)
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writer.long(loc.source.accessHash)
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writer.long(loc.source.volumeId)
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writer.int(loc.source.localId)
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break
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case 'stickerSetThumbnailLegacy':
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writer.int(8)
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writer.long(loc.source.id)
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writer.long(loc.source.accessHash)
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writer.long(loc.source.volumeId)
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writer.int(loc.source.localId)
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break
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case 'stickerSetThumbnailVersion':
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writer.int(9)
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writer.long(loc.source.id)
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writer.long(loc.source.accessHash)
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writer.int(loc.source.version)
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break
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default:
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assertNever(loc.source)
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}
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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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default:
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assertNever(loc)
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}
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const result = telegramRleEncode(writer.result())
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const withSuffix = u8.alloc(result.length + SUFFIX.length)
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withSuffix.set(result)
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withSuffix.set(SUFFIX, result.length)
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return base64.encode(withSuffix, true)
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}
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