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/*Copyright 2021 Eric Selin
This file is part of `bob`.
`bob` is free software: you can redistribute it and/or modifyit under the terms of the GNU Lesser General Public License as published bythe Free Software Foundation, either version 3 of the License, or(at your option) any later version.
`bob` is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty ofMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See theGNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public Licensealong with `bob`. If not, see <https://www.gnu.org/licenses/>.
Please contact the developers via GitHub <https://www.github.com/ericselin>or email eric.selin@gmail.com <mailto:eric.selin@gmail.com>*/
import { listenAndServe } from "https://deno.land/std@0.113.0/http/server.ts";import { serveFile } from "https://deno.land/std@0.113.0/http/file_server.ts";import { posix } from "https://deno.land/std@0.113.0/path/mod.ts";import type { Logger } from "../deps.ts";
type ServerOptions = {  directory: string;  port?: number;  host?: string;  log?: Logger;  proxy404?: string;};
export const serve = (options: ServerOptions): void => {  const directory = options.directory ?? "public";  const port = options.port ?? 8080;  const host = options.host ?? "0.0.0.0";  const addr = `${host}:${port}`;  const { log, proxy404 } = options;
  const handler = async (req: Request): Promise<Response> => {    let response: Response;    let fsPath: string | undefined = undefined;
    try {      // throw not found if this is not a GET      // this will trigger the 404 and possible proxying      if (req.method.toUpperCase() !== "GET") throw new Deno.errors.NotFound();
      const normalizedUrl = new URL(req.url).pathname;      fsPath = posix.join(directory, normalizedUrl);      if (fsPath.endsWith("/")) fsPath = posix.join(fsPath, "index.html");
      response = await serveFile(req, fsPath);    } catch (err) {      if (err instanceof Deno.errors.NotFound) {        if (proxy404) {          const url = new URL(req.url);          url.host = proxy404;          log?.debug(`Proxying ${req.url} to ${url.toString()}...`);          response = await fetch(            url,            new Request(req, { redirect: "manual" }),          );        } else {          response = new Response(`Could not find ${fsPath ?? req.url}`, {            status: 404,          });        }      } else {        log?.error(err.toString());        response = new Response(err.toString(), { status: 500 });      }    }
    log?.debug(`[${response.status}] ${req.url}`);
    return response!;  };
  listenAndServe(addr, handler);
  log?.info(    `HTTP server listening on http://${addr.replace("0.0.0.0", "localhost")}/`,  );};