8 lines
4.7 KiB
Plaintext
8 lines
4.7 KiB
Plaintext
{
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"version": 3,
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"sources": ["../../../src/node/index.ts", "../../../src/node/getHeader.ts"],
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"sourcesContent": ["export type * from './getHeader.js';\nexport * from './getHeader.js';\n", "import * as http from 'node:http';\nimport * as https from 'node:https';\n\n/**\n * Result information from getHeader.\n * @public\n */\nexport interface HeaderResult {\n\tok: boolean;\n\tstatus?: number;\n\tsize?: number;\n\tmagic: boolean | null;\n\theaders?: Record<string, string>;\n\terror?: Error;\n}\n\ninterface RequestResult {\n\tstatus: number;\n\theaders: Record<string, string>;\n\tbuffer?: Buffer;\n}\n\nasync function nodeRequest(u: URL, method: string, headers?: Record<string, string>): Promise<RequestResult> {\n\treturn new Promise((resolve, reject) => {\n\t\tconst reqFn = u.protocol === 'https:' ? https.request : http.request;\n\t\tconst req = reqFn(u, { method, headers }, (res) => {\n\t\t\tconst headersObj: Record<string, string> = {};\n\t\t\tfor (const [k, v] of Object.entries(res.headers)) {\n\t\t\t\theadersObj[k] = Array.isArray(v) ? v.join(',') : (v ?? '');\n\t\t\t}\n\n\t\t\tconst chunks: Buffer[] = [];\n\t\t\tres.on('data', (c) => chunks.push(Buffer.from(c)));\n\t\t\tres.on('end', () => {\n\t\t\t\tconst buffer = chunks.length ? Buffer.concat(chunks) : undefined;\n\t\t\t\tresolve({ status: res.statusCode ?? 0, headers: headersObj, buffer });\n\t\t\t});\n\t\t});\n\n\t\treq.on('error', (err) => reject(err));\n\t\treq.end();\n\t});\n}\n\n/**\n * Perform an HTTP HEAD request to retrieve the file size and verify existence;\n * when `check` is true, fetch a small range and inspect the magic number to confirm the URL points to a valid PDF.\n * If the server does not support range requests, `isPdf` will be set to `false`.\n * @param url - The URL of the PDF file to check. Can be a string or URL object.\n * @param check - When `true`, download a small byte range (first 4 bytes) to validate the file signature by checking for '%PDF' magic bytes. Default: `false`.\n * @returns - A Promise that resolves to a HeaderResult object containing the response status, size, headers, and PDF validation result.\n * @public\n */\nexport async function getHeader(url: string | URL, check: boolean = false): Promise<HeaderResult> {\n\ttry {\n\t\tconst u = typeof url === 'string' ? new URL(url) : url;\n\n\t\tconst headResp = await nodeRequest(u, 'HEAD');\n\t\tconst size = headResp.headers['content-length'] ? parseInt(headResp.headers['content-length'], 10) : undefined;\n\n\t\tlet magic: boolean | null = null;\n\t\tif (check) {\n\t\t\tconst rangeResp = await nodeRequest(u, 'GET', { Range: 'bytes=0-4' });\n\t\t\tif (rangeResp.status >= 200 && rangeResp.status < 300 && rangeResp.buffer) {\n\t\t\t\tconst headerStr = rangeResp.buffer.slice(0, 4).toString('utf8');\n\t\t\t\tmagic = headerStr.startsWith('%PDF');\n\t\t\t} else {\n\t\t\t\tmagic = false;\n\t\t\t}\n\t\t}\n\n\t\treturn {\n\t\t\tok: headResp.status >= 200 && headResp.status < 300,\n\t\t\tstatus: headResp.status,\n\t\t\tsize,\n\t\t\tmagic,\n\t\t\theaders: headResp.headers,\n\t\t};\n\t} catch (error) {\n\t\treturn {\n\t\t\tok: false,\n\t\t\tstatus: undefined,\n\t\t\tsize: undefined,\n\t\t\tmagic: false,\n\t\t\theaders: {},\n\t\t\terror: new Error(String(error)),\n\t\t};\n\t}\n}\n"],
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"names": []
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}
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