@tgsnake/fileid/lib/encode.js

core framework for tgsnake for generating file id

"use strict";
/**
 * tgsnake - Telegram MTProto framework for nodejs.
 * Copyright (C) 2022 butthx <https://github.com/butthx>
 *
 * THIS FILE IS PART OF TGSNAKE
 *
 * tgsnake is a free software : you can redistribute it and/or modify
 * it under the terms of the MIT License as published.
 */
Object.defineProperty(exports, "__esModule", { value: true });
exports.Encode = void 0;
const index_js_1 = require("./index.js");
const node_buffer_1 = require("node:buffer");
class Encode {
    constructor({ fileId, fileUniqueId, }) {
        this.fileId = fileId;
        this.fileUniqueId = fileUniqueId;
    }
    static encode(file) {
        return new Encode({
            fileId: Encode.fileId(file),
            fileUniqueId: Encode.uniqueId(file),
        });
    }
    static fileId(file) {
        let fileType = file.fileType;
        if (file.fileReference) {
            fileType |= index_js_1.FileType.FILE_REFERENCE_FLAG;
        }
        if (file.url) {
            fileType |= index_js_1.FileType.WEB_LOCATION_FLAG;
        }
        const writer = new index_js_1.Writer();
        writer.writeInt(Number(fileType)).writeInt(Number(file.dcId));
        if (file.url) {
            writer.writeString(file.url);
        }
        if (file.fileReference) {
            writer.writeBuffer(file.fileReference);
        }
        writer.writeBigInt(BigInt(String(file.id))).writeBigInt(BigInt(String(file.accessHash)));
        if (index_js_1.PHOTO_TYPES.includes(file.fileType)) {
            writer.writeBigInt(BigInt(String(file.volumeId)));
            if (file.version >= 4)
                writer.writeInt(Number(file.thumbnailSource));
            switch (file.thumbnailSource) {
                case index_js_1.ThumbnailSource.LEGACY:
                    writer.writeBigInt(BigInt(String(file.secret))).writeInt(Number(file.localId));
                case index_js_1.ThumbnailSource.THUMBNAIL:
                    writer
                        .writeInt(Number(file.thumbnailFileType))
                        .writeInt(String(file.thumbnailSize).charCodeAt(0))
                        .writeInt(Number(file.localId));
                    break;
                case index_js_1.ThumbnailSource.CHAT_PHOTO_BIG:
                case index_js_1.ThumbnailSource.CHAT_PHOTO_SMALL:
                    writer
                        .writeBigInt(BigInt(String(file.chatId)))
                        .writeBigInt(BigInt(String(file.chatAccessHash)))
                        .writeInt(Number(file.localId));
                    break;
                case index_js_1.ThumbnailSource.STICKER_SET_THUMBNAIL:
                    writer
                        .writeBigInt(BigInt(String(file.stickerSetId)))
                        .writeBigInt(BigInt(String(file.stickerSetAccessHash)))
                        .writeInt(Number(file.localId));
                    break;
                default:
                    throw new Error(`unknown encoder for thumbnailSource ${file.thumbnailSource}`);
            }
        }
        else if (index_js_1.DOCUMENT_TYPES.includes(fileType)) {
            writer.writeInt(file.version);
            writer.writeInt(file.subVersion);
        }
        return (0, index_js_1.base64_url_encode)((0, index_js_1.rle_encode)(node_buffer_1.Buffer.concat([writer.results(), node_buffer_1.Buffer.from([file.subVersion, file.version])])));
    }
    static uniqueId(file) {
        let writer;
        switch (file.fileTypeUniqueId) {
            case index_js_1.FileTypeUniqueId.WEB:
                writer = new index_js_1.Writer();
                writer.writeInt(Number(file.fileTypeUniqueId)).writeString(String(file.url));
                break;
            case index_js_1.FileTypeUniqueId.PHOTO:
                writer = new index_js_1.Writer();
                writer
                    .writeInt(Number(file.fileTypeUniqueId))
                    .writeBigInt(BigInt(String(file.volumeId)))
                    .writeInt(Number(file.localId));
                break;
            case index_js_1.FileTypeUniqueId.DOCUMENT:
                writer = new index_js_1.Writer();
                writer.writeInt(Number(file.fileTypeUniqueId)).writeBigInt(BigInt(String(file.id)));
                break;
            default:
                throw new Error(`unknown encoder for fileTypeUniqueId ${file.fileTypeUniqueId}`);
        }
        return (0, index_js_1.base64_url_encode)((0, index_js_1.rle_encode)(writer.results()));
    }
}
exports.Encode = Encode;
//# sourceMappingURL=encode.js.map