1 | // @remove-on-eject-begin
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2 | /**
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3 | * Copyright (c) 2015-present, Facebook, Inc.
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4 | *
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5 | * This source code is licensed under the MIT license found in the
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6 | * LICENSE file in the root directory of this source tree.
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7 | */
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8 | // @remove-on-eject-end
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9 | ;
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10 |
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11 | const errorOverlayMiddleware = require('react-dev-utils/errorOverlayMiddleware');
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12 | const evalSourceMapMiddleware = require('react-dev-utils/evalSourceMapMiddleware');
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13 | const noopServiceWorkerMiddleware = require('react-dev-utils/noopServiceWorkerMiddleware');
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14 | const ignoredFiles = require('react-dev-utils/ignoredFiles');
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15 | const paths = require('./paths');
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16 | const fs = require('fs');
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17 |
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18 | const protocol = process.env.HTTPS === 'true' ? 'https' : 'http';
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19 | const host = process.env.HOST || '0.0.0.0';
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20 |
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21 | module.exports = function(proxy, allowedHost) {
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22 | return {
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23 | // WebpackDevServer 2.4.3 introduced a security fix that prevents remote
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24 | // websites from potentially accessing local content through DNS rebinding:
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25 | // https://github.com/webpack/webpack-dev-server/issues/887
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26 | // https://medium.com/webpack/webpack-dev-server-middleware-security-issues-1489d950874a
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27 | // However, it made several existing use cases such as development in cloud
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28 | // environment or subdomains in development significantly more complicated:
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29 | // https://github.com/facebook/create-react-app/issues/2271
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30 | // https://github.com/facebook/create-react-app/issues/2233
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31 | // While we're investigating better solutions, for now we will take a
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32 | // compromise. Since our WDS configuration only serves files in the `public`
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33 | // folder we won't consider accessing them a vulnerability. However, if you
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34 | // use the `proxy` feature, it gets more dangerous because it can expose
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35 | // remote code execution vulnerabilities in backends like Django and Rails.
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36 | // So we will disable the host check normally, but enable it if you have
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37 | // specified the `proxy` setting. Finally, we let you override it if you
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38 | // really know what you're doing with a special environment variable.
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39 | disableHostCheck:
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40 | !proxy || process.env.DANGEROUSLY_DISABLE_HOST_CHECK === 'true',
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41 | // Enable gzip compression of generated files.
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42 | compress: true,
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43 | // Silence WebpackDevServer's own logs since they're generally not useful.
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44 | // It will still show compile warnings and errors with this setting.
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45 | clientLogLevel: 'none',
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46 | // By default WebpackDevServer serves physical files from current directory
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47 | // in addition to all the virtual build products that it serves from memory.
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48 | // This is confusing because those files won’t automatically be available in
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49 | // production build folder unless we copy them. However, copying the whole
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50 | // project directory is dangerous because we may expose sensitive files.
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51 | // Instead, we establish a convention that only files in `public` directory
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52 | // get served. Our build script will copy `public` into the `build` folder.
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53 | // In `index.html`, you can get URL of `public` folder with %PUBLIC_URL%:
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54 | // <link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico">
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55 | // In JavaScript code, you can access it with `process.env.PUBLIC_URL`.
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56 | // Note that we only recommend to use `public` folder as an escape hatch
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57 | // for files like `favicon.ico`, `manifest.json`, and libraries that are
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58 | // for some reason broken when imported through Webpack. If you just want to
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59 | // use an image, put it in `src` and `import` it from JavaScript instead.
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60 | contentBase: paths.appPublic,
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61 | // By default files from `contentBase` will not trigger a page reload.
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62 | watchContentBase: true,
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63 | // Enable hot reloading server. It will provide /sockjs-node/ endpoint
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64 | // for the WebpackDevServer client so it can learn when the files were
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65 | // updated. The WebpackDevServer client is included as an entry point
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66 | // in the Webpack development configuration. Note that only changes
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67 | // to CSS are currently hot reloaded. JS changes will refresh the browser.
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68 | hot: true,
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69 | // It is important to tell WebpackDevServer to use the same "root" path
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70 | // as we specified in the config. In development, we always serve from /.
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71 | publicPath: '/',
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72 | // WebpackDevServer is noisy by default so we emit custom message instead
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73 | // by listening to the compiler events with `compiler.hooks[...].tap` calls above.
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74 | quiet: true,
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75 | // Reportedly, this avoids CPU overload on some systems.
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76 | // https://github.com/facebook/create-react-app/issues/293
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77 | // src/node_modules is not ignored to support absolute imports
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78 | // https://github.com/facebook/create-react-app/issues/1065
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79 | watchOptions: {
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80 | ignored: ignoredFiles(paths.appSrc),
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81 | },
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82 | // Enable HTTPS if the HTTPS environment variable is set to 'true'
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83 | https: protocol === 'https',
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84 | host,
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85 | overlay: false,
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86 | historyApiFallback: {
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87 | // Paths with dots should still use the history fallback.
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88 | // See https://github.com/facebook/create-react-app/issues/387.
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89 | disableDotRule: true,
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90 | },
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91 | public: allowedHost,
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92 | proxy,
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93 | before(app, server) {
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94 | if (fs.existsSync(paths.proxySetup)) {
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95 | // This registers user provided middleware for proxy reasons
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96 | require(paths.proxySetup)(app);
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97 | }
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98 |
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99 | // This lets us fetch source contents from webpack for the error overlay
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100 | app.use(evalSourceMapMiddleware(server));
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101 | // This lets us open files from the runtime error overlay.
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102 | app.use(errorOverlayMiddleware());
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103 |
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104 | // This service worker file is effectively a 'no-op' that will reset any
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105 | // previous service worker registered for the same host:port combination.
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106 | // We do this in development to avoid hitting the production cache if
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107 | // it used the same host and port.
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108 | // https://github.com/facebook/create-react-app/issues/2272#issuecomment-302832432
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109 | app.use(noopServiceWorkerMiddleware());
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110 | },
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111 | };
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112 | };
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