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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
import {  dirname,  ensureDir,  fromFileUrl,  isAbsolute,  join,  readAll,  sep,  writeAll,} from "./deps.ts";import { assert, CACHE_PERM, urlToFilename } from "./util.ts";
export class DiskCache {  location: string;
  constructor(location: string) {    assert(isAbsolute(location));    this.location = location;  }
  async get(filename: string): Promise<Uint8Array> {    const path = join(this.location, filename);    const file = await Deno.open(path, { read: true });    const value = await readAll(file);    file.close();    return value;  }
  async set(filename: string, data: Uint8Array): Promise<void> {    const path = join(this.location, filename);    const parentFilename = dirname(path);    await ensureDir(parentFilename);    const file = await Deno.open(path, {      write: true,      create: true,      mode: CACHE_PERM,    });    await writeAll(file, data);    file.close();  }
  static getCacheFilename(url: URL): string | undefined {    const out: string[] = [];    const scheme = url.protocol.replace(":", "");    out.push(scheme);
    switch (scheme) {      case "wasm": {        const { hostname, port } = url;        out.push(port ? `${hostname}_PORT${port}` : hostname);        out.push(...url.pathname.split("/"));        break;      }      case "http":      case "https":      case "data":      case "blob":        return urlToFilename(url);      case "file": {        const path = fromFileUrl(url);        if (!path) {          return undefined;        }        const { host } = url;        if (host) {          out.push("UNC");          out.push(host.replaceAll(":", "_"));        }        const pathComponents = path.split(sep).filter((p) => p.length > 0);        if (Deno.build.os === "windows") {          if (host) {            // windows will have the host in the result of fromFileUrl, so remove it            pathComponents.shift();          }
          const first = pathComponents.shift();          assert(first);          out.push(first.replace(/:$/, ""));        }        out.push(...pathComponents);        break;      }      default:        return undefined;    }    return join(...out);  }
  static getCacheFilenameWithExtension(    url: URL,    extension: string,  ): string | undefined {    const base = this.getCacheFilename(url);    return base ? `${base}.${extension}` : undefined;  }}