106 lines
3.2 KiB
TypeScript
106 lines
3.2 KiB
TypeScript
import type { SmartArchive } from './classes.smartarchive.js';
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import type { TSupportedMime } from './interfaces.js';
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import * as plugins from './plugins.js';
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/**
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* Type for decompression streams
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*/
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export type TDecompressionStream =
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| plugins.stream.Transform
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| plugins.stream.Duplex
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| plugins.tarStream.Extract;
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/**
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* Result of archive analysis
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*/
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export interface IAnalyzedResult {
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fileType: plugins.fileType.FileTypeResult | undefined;
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isArchive: boolean;
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resultStream: plugins.smartstream.SmartDuplex<Buffer, Buffer>;
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decompressionStream: TDecompressionStream;
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}
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/**
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* Analyzes archive streams to detect format and provide decompression
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*/
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export class ArchiveAnalyzer {
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private smartArchiveRef: SmartArchive;
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constructor(smartArchiveRefArg: SmartArchive) {
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this.smartArchiveRef = smartArchiveRefArg;
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}
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/**
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* Check if a MIME type represents an archive format
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*/
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private async mimeTypeIsArchive(mimeType: string | undefined): Promise<boolean> {
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if (!mimeType) return false;
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const archiveMimeTypes: Set<string> = new Set([
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'application/zip',
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'application/x-rar-compressed',
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'application/x-tar',
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'application/gzip',
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'application/x-7z-compressed',
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'application/x-bzip2',
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]);
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return archiveMimeTypes.has(mimeType);
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}
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/**
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* Get the appropriate decompression stream for a MIME type
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*/
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private async getDecompressionStream(mimeTypeArg: TSupportedMime): Promise<TDecompressionStream> {
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switch (mimeTypeArg) {
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case 'application/gzip':
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return this.smartArchiveRef.gzipTools.getDecompressionStream();
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case 'application/zip':
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return this.smartArchiveRef.zipTools.getDecompressionStream();
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case 'application/x-bzip2':
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return this.smartArchiveRef.bzip2Tools.getDecompressionStream();
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case 'application/x-tar':
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return this.smartArchiveRef.tarTools.getDecompressionStream();
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default:
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// Handle unsupported formats or no decompression needed
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return plugins.smartstream.createPassThrough();
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}
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}
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/**
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* Create an analyzed stream that detects archive type and provides decompression
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* Emits a single IAnalyzedResult object
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*/
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public getAnalyzedStream(): plugins.smartstream.SmartDuplex<Buffer, IAnalyzedResult> {
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let firstRun = true;
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const resultStream = plugins.smartstream.createPassThrough();
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const analyzerstream = new plugins.smartstream.SmartDuplex<Buffer, IAnalyzedResult>({
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readableObjectMode: true,
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writeFunction: async (chunkArg: Buffer, streamtools) => {
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if (firstRun) {
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firstRun = false;
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const fileType = await plugins.fileType.fileTypeFromBuffer(chunkArg);
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const decompressionStream = await this.getDecompressionStream(fileType?.mime as TSupportedMime);
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const result: IAnalyzedResult = {
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fileType,
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isArchive: await this.mimeTypeIsArchive(fileType?.mime),
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resultStream,
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decompressionStream,
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};
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await streamtools.push(result);
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}
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await resultStream.backpressuredPush(chunkArg);
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return null;
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},
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finalFunction: async () => {
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resultStream.push(null);
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return null;
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},
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});
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return analyzerstream;
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}
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}
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