feat(@angular/cli): add host check flags to ng serve

Two new flags are added to `ng serve`:
- `--public-host` (aliased by `--live-reload-client): Specify the URL that the browser client will use.
- `--disable-host-check`: Don't verify connected clients are part of allowed hosts.

Setting `--disable-host-check` will output a warning:
```
WARNING Running a server with --disable-host-check is a security risk. See https://medium.com/webpack/webpack-dev-server-middleware-security-issues-1489d950874a for more information.
```

See angular#6070 for more context about this change.

Fix angular#6070

Author: filipesilva

Diff for: docs/documentation/serve.md

@@ -39,12 +39,22 @@ All the build Options are available in serve, below are the additional options.
 </details>
 
 <details>
-  <summary>live-reload-client</summary>
+  <summary>public-host</summary>
   <p>
-    <code>--live-reload-client</code>
+    <code>--public</code> (aliases: <code>--live-reload-client</code>)
   </p>
   <p>
-    Specify the URL that the live reload browser client will use.
+    Specify the URL that the browser client will use.
+  </p>
+</details>
+
+<details>
+  <summary>disable-host-check</summary>
+  <p>
+    <code>--disable-host-check</code> <em>default value: false</em>
+  </p>
+  <p>
+    Don't verify connected clients are part of allowed hosts.
   </p>
 </details>
 

Diff for: package.json

@@ -96,7 +96,7 @@
     "url-loader": "^0.5.7",
     "walk-sync": "^0.3.1",
     "webpack": "~2.4.0",
-    "webpack-dev-server": "~2.4.2",
+    "webpack-dev-server": "~2.4.5",
     "webpack-merge": "^2.4.0",
     "zone.js": "^0.8.4"
   },

Diff for: packages/@angular/cli/commands/serve.ts

@@ -20,7 +20,8 @@ export interface ServeTaskOptions extends BuildOptions {
   host?: string;
   proxyConfig?: string;
   liveReload?: boolean;
-  liveReloadClient?: string;
+  publicHost?: string;
+  disableHostCheck?: boolean;
   ssl?: boolean;
   sslKey?: string;
   sslCert?: string;
@@ -84,9 +85,16 @@ export const baseServeCommandOptions: any = overrideOptions([
     description: 'Whether to reload the page on change, using live-reload.'
   },
   {
-    name: 'live-reload-client',
+    name: 'public-host',
     type: String,
-    description: 'Specify the URL that the live reload browser client will use.'
+    aliases: ['live-reload-client'],
+    description: 'Specify the URL that the browser client will use.'
+  },
+  {
+    name: 'disable-host-check',
+    type: Boolean,
+    default: false,
+    description: 'Don\'t verify connected clients are part of allowed hosts.',
   },
   {
     name: 'hmr',

Diff for: packages/@angular/cli/custom-typings.d.ts

@@ -21,4 +21,6 @@ interface IWebpackDevServerConfigurationOptions {
   key?: string;
   cert?: string;
   overlay?: boolean | { errors: boolean, warnings: boolean };
+  public?: string;
+  disableHostCheck?: boolean;
 }

Diff for: packages/@angular/cli/package.json

@@ -81,7 +81,7 @@
     "url-loader": "^0.5.7",
     "walk-sync": "^0.3.1",
     "webpack": "~2.4.0",
-    "webpack-dev-server": "~2.4.2",
+    "webpack-dev-server": "~2.4.5",
     "webpack-merge": "^2.4.0",
     "zone.js": "^0.8.4"
   },

Diff for: packages/@angular/cli/tasks/serve.ts

@@ -47,9 +47,18 @@ export default Task.extend({
       hostname: serveTaskOptions.host,
       port: serveTaskOptions.port.toString()
     });
+
+    if (serveTaskOptions.disableHostCheck) {
+      ui.writeLine(oneLine`
+          ${chalk.yellow('WARNING')} Running a server with --disable-host-check is a security risk.
+          See https://medium.com/webpack/webpack-dev-server-middleware-security-issues-1489d950874a
+          for more information.
+        `);
+    }
+
     let clientAddress = serverAddress;
-    if (serveTaskOptions.liveReloadClient) {
-      const clientUrl = url.parse(serveTaskOptions.liveReloadClient);
+    if (serveTaskOptions.publicHost) {
+      const clientUrl = url.parse(serveTaskOptions.publicHost);
       // very basic sanity check
       if (!clientUrl.host) {
         return Promise.reject(new SilentError(`'live-reload-client' must be a full URL.`));
@@ -94,7 +103,7 @@ export default Task.extend({
       webpackConfig.plugins.unshift({
         apply: (compiler: any) => {
           compiler.plugin('after-environment', () => {
-            compiler.watchFileSystem = { watch: () => {} };
+            compiler.watchFileSystem = { watch: () => { } };
           });
         }
       });
@@ -151,7 +160,9 @@ export default Task.extend({
         errors: serveTaskOptions.target === 'development',
         warnings: false
       },
-      contentBase: false
+      contentBase: false,
+      public: serveTaskOptions.publicHost,
+      disableHostCheck: serveTaskOptions.disableHostCheck
     };
 
     if (sslKey != null && sslCert != null) {
@@ -185,7 +196,7 @@ export default Task.extend({
           return reject(err);
         }
         if (serveTaskOptions.open) {
-            opn(serverAddress);
+          opn(serverAddress);
         }
       });
     })

Diff for: tests/e2e/tests/misc/live-reload.ts

@@ -104,7 +104,7 @@ export default function () {
     // Serve with live reload client set to api should call api.
     .then(_ => silentExecAndWaitForOutputToMatch(
       'ng',
-      ['e2e', '--watch', `--live-reload-client=${apiUrl}`],
+      ['e2e', '--watch', `--public-host=${apiUrl}`],
       protractorGoodRegEx
     ))
     .then(_ => wait(2000))

Diff for: tests/e2e/tests/misc/public-host.ts

@@ -0,0 +1,43 @@
+import * as os from 'os';
+import * as _ from 'lodash';
+
+import { request } from '../../utils/http';
+import { killAllProcesses } from '../../utils/process';
+import { ngServe } from '../../utils/project';
+
+export default function () {
+  const firstLocalIp = _(os.networkInterfaces())
+    .values()
+    .flatten()
+    .filter({ family: 'IPv4', internal: false })
+    .map('address')
+    .first();
+  const publicHost = `${firstLocalIp}:4200`;
+  const localAddress = `http://${publicHost}`;
+
+  return Promise.resolve()
+    .then(() => ngServe('--host=0.0.0.0'))
+    .then(() => request(localAddress))
+    .then(body => {
+      if (!body.match(/Invalid Host header/)) {
+        throw new Error('Response does not match expected value.');
+      }
+    })
+    .then(() => killAllProcesses(), (err) => { killAllProcesses(); throw err; })
+    .then(() => ngServe('--host=0.0.0.0', `--public-host=${publicHost}`))
+    .then(() => request(localAddress))
+    .then(body => {
+      if (!body.match(/<app-root>Loading...<\/app-root>/)) {
+        throw new Error('Response does not match expected value.');
+      }
+    })
+    .then(() => killAllProcesses(), (err) => { killAllProcesses(); throw err; })
+    .then(() => ngServe('--host=0.0.0.0', `--disable-host-check`))
+    .then(() => request(localAddress))
+    .then(body => {
+      if (!body.match(/<app-root>Loading...<\/app-root>/)) {
+        throw new Error('Response does not match expected value.');
+      }
+    })
+    .then(() => killAllProcesses(), (err) => { killAllProcesses(); throw err; });
+}