"use strict";

const fs = require("fs");
const evalSourceMapMiddleware = require("react-dev-utils/evalSourceMapMiddleware");
const noopServiceWorkerMiddleware = require("react-dev-utils/noopServiceWorkerMiddleware");
const ignoredFiles = require("react-dev-utils/ignoredFiles");
const redirectServedPath = require("react-dev-utils/redirectServedPathMiddleware");
const paths = require("./paths");
const getHttpsConfig = require("./getHttpsConfig");

const host = process.env.HOST || "0.0.0.0";
const sockHost = process.env.WDS_SOCKET_HOST;
const sockPath = process.env.WDS_SOCKET_PATH; // default: '/ws'
const sockPort = process.env.WDS_SOCKET_PORT;

module.exports = function (proxy, allowedHost) {
  const disableFirewall =
    !proxy || process.env.DANGEROUSLY_DISABLE_HOST_CHECK === "true";
  return {
    // WebpackDevServer 2.4.3 introduced a security fix that prevents remote
    // websites from potentially accessing local content through DNS rebinding:
    // https://github.com/webpack/webpack-dev-server/issues/887
    // https://medium.com/webpack/webpack-dev-server-middleware-security-issues-1489d950874a
    // However, it made several existing use cases such as development in cloud
    // environment or subdomains in development significantly more complicated:
    // https://github.com/facebook/create-react-app/issues/2271
    // https://github.com/facebook/create-react-app/issues/2233
    // While we're investigating better solutions, for now we will take a
    // compromise. Since our WDS configuration only serves files in the `public`
    // folder we won't consider accessing them a vulnerability. However, if you
    // use the `proxy` feature, it gets more dangerous because it can expose
    // remote code execution vulnerabilities in backends like Django and Rails.
    // So we will disable the host check normally, but enable it if you have
    // specified the `proxy` setting. Finally, we let you override it if you
    // really know what you're doing with a special environment variable.
    // Note: ["localhost", ".localhost"] will support subdomains - but we might
    // want to allow setting the allowedHosts manually for more complex setups
    allowedHosts: disableFirewall ? "all" : [allowedHost],
    headers: {
      "Access-Control-Allow-Origin": "*",
      "Access-Control-Allow-Methods": "*",
      "Access-Control-Allow-Headers": "*",
    },
    // Enable gzip compression of generated files.
    compress: true,
    static: {
      // By default WebpackDevServer serves physical files from current directory
      // in addition to all the virtual build products that it serves from memory.
      // This is confusing because those files won’t automatically be available in
      // production build folder unless we copy them. However, copying the whole
      // project directory is dangerous because we may expose sensitive files.
      // Instead, we establish a convention that only files in `public` directory
      // get served. Our build script will copy `public` into the `build` folder.
      // In `index.html`, you can get URL of `public` folder with %PUBLIC_URL%:
      // <link rel="icon" href="%PUBLIC_URL%/favicon.ico">
      // In JavaScript code, you can access it with `process.env.PUBLIC_URL`.
      // Note that we only recommend to use `public` folder as an escape hatch
      // for files like `favicon.ico`, `manifest.json`, and libraries that are
      // for some reason broken when imported through webpack. If you just want to
      // use an image, put it in `src` and `import` it from JavaScript instead.
      directory: paths.appPublic,
      publicPath: [paths.publicUrlOrPath],
      // By default files from `contentBase` will not trigger a page reload.
      watch: {
        // Reportedly, this avoids CPU overload on some systems.
        // https://github.com/facebook/create-react-app/issues/293
        // src/node_modules is not ignored to support absolute imports
        // https://github.com/facebook/create-react-app/issues/1065
        ignored: ignoredFiles(paths.appSrc),
      },
    },
    client: {
      webSocketURL: {
        hostname: "127.0.0.1",
        pathname: "/ws",
        port: 3000,
        protocol: "ws",
      },
      overlay: {
        warnings: false,
        errors: false,
      },
    },
    devMiddleware: {
      // It is important to tell WebpackDevServer to use the same "publicPath" path as
      // we specified in the webpack config. When homepage is '.', default to serving
      // from the root.
      // remove last slash so user can land on `/test` instead of `/test/`
      publicPath: paths.publicUrlOrPath.slice(0, -1),
    },

    // Determine server protocol (http/https) per WDS v5 `server` option
    server: (() => {
      const httpsConfig = getHttpsConfig();
      if (httpsConfig) {
        if (typeof httpsConfig === "object") {
          return {
            type: "https",
            options: httpsConfig,
          };
        }
        // boolean true means use basic https
        return "https";
      }
      return "http";
    })(),
    host,
    historyApiFallback: {
      // Paths with dots should still use the history fallback.
      // See https://github.com/facebook/create-react-app/issues/387.
      disableDotRule: true,
      index: paths.publicUrlOrPath,
    },
    // `proxy` is run between `before` and `after` `webpack-dev-server` hooks
    proxy,
    setupMiddlewares(middlewares, devServer) {
      // ------------------------------
      // Replaces deprecated onBeforeSetupMiddleware and onAfterSetupMiddleware.
      // For details see: https://github.com/webpack/webpack-dev-server/blob/master/migration-v5.md
      // ------------------------------
      // Equivalent of previous onBeforeSetupMiddleware
      middlewares.unshift(evalSourceMapMiddleware(devServer));

      if (fs.existsSync(paths.proxySetup)) {
        require(paths.proxySetup)(devServer.app);
      }

      // Equivalent of previous onAfterSetupMiddleware (executed last)
      middlewares.push(redirectServedPath(paths.publicUrlOrPath));
      middlewares.push(noopServiceWorkerMiddleware(paths.publicUrlOrPath));

      return middlewares;
    },
  };
};