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Module

x/cache/file_fetcher.ts

🥌 Deno cache library
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import type { Metadata } from "./file.ts";import { CacheError } from "./cache.ts";import { exists, fromFileUrl } from "./deps.ts";
async function protocolFile(url: URL, dest: string): Promise<Metadata> { const path = fromFileUrl(url); try { if (!(await exists(path))) { throw new CacheError(`${path} does not exist on the local system.`); } } catch { throw new CacheError(`${path} is not valid.`); } await Deno.copyFile(path, dest); return { url: url.href, };}
async function protocolHttp(url: URL, dest: string): Promise<Metadata> { const download = await fetch(url); if (!download.ok) { throw new CacheError(download.statusText); } const source = await download.arrayBuffer(); await Deno.writeFile(dest, new Uint8Array(source));
const headers: { [key: string]: string } = {}; for (const [key, value] of download.headers) { headers[key] = value; } return { url: url.href, headers, };}
export async function fetchFile(url: URL, dest: string): Promise<Metadata> { switch (url.protocol) { case "file:": return await protocolFile(url, dest);
case "http:": case "https:": return await protocolHttp(url, dest);
default: throw new CacheError(`unsupported protocol ("${url}")`); }}