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import secureCompare from "https://deno.land/x/secure_compare@1.0.0/mod.ts";
export interface MapWithGettableValues {  get(headerName: string): string | null;}
export interface Requestlike {  headers: MapWithGettableValues;}
/** * Authenticates the given request with the given user-password table. * Returns unauthorized response if the request is not authenticated, otherwise * returns undefined. * * ``` * import { basicAuth } from "https://deno.land/x/basic_auth@v1.0.0/mod.ts"; * * addEventListener("fetch", (e) => { *   const unauthorized = basicAuth(e.request, "Access to my site", { *     "user": "password", *   }); *   if (unauthorized) { *     e.respondWith(unauthorized); *     return; *   } *   e.respondWith(new Response("You are authorized!")); * }); * ``` */export function basicAuth(  request: Requestlike,  realm: string,  userPasswordTable: Record<string, string>,): Response | undefined {  const authorization = request.headers.get("authorization");  if (authorization) {    const match = authorization.match(/^Basic\s+(.*)$/);    if (match) {      const [user, pw] = atob(match[1]).split(":");      if (Object.prototype.hasOwnProperty.call(userPasswordTable, user)) {        const expectedPw = userPasswordTable[user];        if (secureCompare(pw, expectedPw)) {          return;        }      }    }  }
  return new Response("401 Unauthorized", {    status: 401,    statusText: "Unauthorized",    headers: {      "www-authenticate": `Basic realm="${realm}"`,    },  });}