Created
January 12, 2021 07:30
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media_extractor.ts
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| import { makeTokenizer as makeHTTPTokenizer } from "@tokenizer/http"; | |
| import { imageSize } from "image-size"; | |
| export class MediaExtractor { | |
| public async peek(url: string) { | |
| const CHUNK_SIZE = 1024 * 64; // 64KByte | |
| try { | |
| const tokenizer = await makeHTTPTokenizer(url, { | |
| initialChunkSize: CHUNK_SIZE * 2, // 128 KByte | |
| minimumChunkSize: CHUNK_SIZE, // 64 KBytes | |
| }); | |
| const bytesToRead = Math.min(tokenizer.fileInfo.size!, CHUNK_SIZE); | |
| const buf = Buffer.alloc(bytesToRead, 0x00); | |
| await tokenizer.peekBuffer(buf); | |
| await tokenizer.close(); | |
| try { | |
| const image = imageSize(buf); | |
| return { | |
| url, | |
| resolvedUrl: tokenizer.fileInfo.url, | |
| size: tokenizer.fileInfo.size, | |
| type: image.type, | |
| width: image.width, | |
| height: image.height, | |
| orientation: image.orientation, | |
| }; | |
| } catch (e) { | |
| // Zero results | |
| return null; | |
| } | |
| } catch (e) { | |
| return null; | |
| } | |
| } | |
| } |
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