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// Copyright 2019-2020 Yusuke Sakurai. All rights reserved. MIT license.import { RoutingError } from "./error.ts";import { Sha1 } from "./vendor/https/deno.land/std/hash/sha1.ts";import { assert } from "./vendor/https/deno.land/std/testing/asserts.ts";import { ServeHandler } from "./server.ts";
/** Deny requests with 400 if content-type doesn't match */export const contentTypeFilter = (  ...types: (string | RegExp)[]): ServeHandler =>  async (req) => {    if (types.some((v) => req.headers.get("content-type")?.match(v))) {      return;    }    throw new RoutingError(400);  };
function timeSafeCompare(secret: string, other: string): boolean {  const a = new Sha1();  const b = new Sha1();  a.update(secret);  b.update(other);  return a.toString() === b.toString();}
export interface BasicAuthOption {  credentials: {    username: string;    password: string;  }[];  message?: string;}
/** Basic Auth middleware */export function basicAuth(  { credentials, message }: BasicAuthOption,): ServeHandler {  const users = new Map<string, string>();  for (const { username, password } of credentials) {    assert(username, "username must be defined and not be empty");    assert(password, "password must be defined and not be ampty");    users.set(username, password);  }  //  WWW-Authenticate: Basic realm="SECRET AREA"  return async function basicAuth(req) {    const authorization = req.headers.get("authorization");    if (!authorization) {      return req.respond({        status: 401,        headers: new Headers({          "www-authenticate": 'Basic realm="RECRET AREA"',        }),        body: message ?? "Authentication Required",      });    } else {      const unauthorized = () =>        req.respond({ status: 401, body: "Unauthorized" });      let m = authorization.match(/^Basic (.+?)$/);      if (!m) {        return unauthorized();      }      const [u, p] = atob(m[1]).split(":");      if (u == null || p == null) {        return unauthorized();      }      const password = users.get(u);      if (password == null) {        return unauthorized();      }      if (!timeSafeCompare(password, p)) {        return unauthorized();      }    }  };}