feat: support targeting browser in login command (#537)

* feat: support targeting browser in login command

* refactor: using flags.enum instead of flag.string

Author: aemounib

command-snapshot.json

@@ -83,7 +83,8 @@
       "noprompt",
       "setalias",
       "setdefaultdevhubusername",
-      "setdefaultusername"
+      "setdefaultusername",
+      "browser"
     ],
     "alias": ["force:auth:web:login"]
   }

messages/web.login.json

@@ -1,10 +1,12 @@
 {
-  "description": "authorize an org using the web login flow\nIf you specify an --instanceurl value, this value overrides the sfdcLoginUrl value in your sfdx-project.json file. To specify a My Domain URL, use the format MyDomainName.my.salesforce.com (not MyDomainName.lightning.force.com). To log in to a sandbox, set --instanceurl to https://MyDomainName--SandboxName.sandbox.my.salesforce.com.",
+  "description": "authorize an org using the web login flow\nIf you specify an --instanceurl value, this value overrides the sfdcLoginUrl value in your sfdx-project.json file. To specify a My Domain URL, use the format MyDomainName.my.salesforce.com (not MyDomainName.lightning.force.com). To log in to a sandbox, set --instanceurl to https://MyDomainName--SandboxName.sandbox.my.salesforce.com.\nTo open in a specific browser, use the --browser parameter. Supported browsers are \"chrome\", \"edge\", and \"firefox\". If you don't specify --browser, the org opens in your default browser.",
   "examples": [
     "$ sfdx auth:web:login -a TestOrg1",
     "$ sfdx auth:web:login -i <OAuth client id>",
-    "$ sfdx auth:web:login -r https://MyDomainName--SandboxName.sandbox.my.salesforce.com"
+    "$ sfdx auth:web:login -r https://MyDomainName--SandboxName.sandbox.my.salesforce.com",
+    "$ sfdx auth:web:login -a TestOrg1 -b firefox"
   ],
+  "browser": "browser where the org opens",
   "deviceWarning": "auth:web:login doesn't work when authorizing to a headless environment. Use auth:device:login instead.",
   "invalidClientId": "Invalid client credentials. Verify the OAuth client secret and ID. %s"
 }

src/commands/auth/web/login.ts

@@ -26,6 +26,11 @@ export default class Login extends SfdxCommand {
   public static aliases = ['force:auth:web:login'];
 
   public static readonly flagsConfig: FlagsConfig = {
+    browser: flags.enum({
+      char: 'b',
+      description: messages.getMessage('browser'),
+      options: ['chrome', 'edge', 'firefox'], // These are ones supported by "open" package
+    }),
     clientid: flags.string({
       char: 'i',
       description: commonMessages.getMessage('clientId'),
@@ -102,7 +107,10 @@ export default class Login extends SfdxCommand {
   private async executeLoginFlow(oauthConfig: OAuth2Config): Promise<AuthInfo> {
     const oauthServer = await WebOAuthServer.create({ oauthConfig });
     await oauthServer.start();
-    await open(oauthServer.getAuthorizationUrl(), { wait: false });
+    const openOptions = this.flags.browser
+      ? { app: { name: open.apps[this.flags.browser as string] as open.AppName }, wait: false }
+      : { wait: false };
+    await open(oauthServer.getAuthorizationUrl(), openOptions);
     return oauthServer.authorizeAndSave();
   }
 }