cli: Throw error if non org is provided to create-github-app

Signed-off-by: Johan Haals <johan.haals@gmail.com>

.changeset/swift-bugs-share.md

@@ -0,0 +1,5 @@
+---
+'@backstage/cli': patch
+---
+
+Updated the `create-github-app` command to throw an error if the organization argument is a user or a non existing organization.

packages/cli/package.json

@@ -93,6 +93,7 @@
     "lodash": "^4.17.21",
     "mini-css-extract-plugin": "^2.4.2",
     "minimatch": "5.0.1",
+    "node-fetch": "^2.6.7",
     "node-libs-browser": "^2.2.1",
     "npm-packlist": "^5.0.0",
     "ora": "^5.3.0",

packages/cli/src/commands/create-github-app/index.ts

@@ -19,11 +19,13 @@ import chalk from 'chalk';
 import { stringify as stringifyYaml } from 'yaml';
 import { paths } from '../../lib/paths';
 import { GithubCreateAppServer } from './GithubCreateAppServer';
+import fetch from 'node-fetch';
 
 // This is an experimental command that at this point does not support GitHub Enterprise
 // due to lacking support for creating apps from manifests.
 // https://docs.github.com/en/free-pro-team@latest/developers/apps/creating-a-github-app-from-a-manifest
 export default async (org: string) => {
+  await verifyGithubOrg(org);
   const { slug, name, ...config } = await GithubCreateAppServer.run({ org });
 
   const fileName = `github-app-${slug}-credentials.yaml`;
@@ -47,3 +49,14 @@ integrations:
         - $include: ${fileName}`),
   );
 };
+
+async function verifyGithubOrg(org: string): Promise<void> {
+  const response = await fetch(
+    `https://api.github.com/orgs/${encodeURIComponent(org)}`,
+  );
+  if (!response.ok) {
+    throw new Error(
+      `GitHub organization '${org}' does not exist. Please verify the name and try again.`,
+    );
+  }
+}