ci(aio): add initial implementation for aio-builds setup

aio/aio-builds-setup/dockerbuild/scripts-js/lib/upload-server/index.ts

@@ -0,0 +1,42 @@
+// TODO(gkalpak): Find more suitable way to run as `www-data`.
+process.setuid('www-data');
+
+// Imports
+import {GithubPullRequests} from '../common/github-pull-requests';
+import {getEnvVar} from '../common/utils';
+import {CreatedBuildEvent} from './build-events';
+import {uploadServerFactory} from './upload-server-factory';
+
+// Constants
+const AIO_BUILDS_DIR = getEnvVar('AIO_BUILDS_DIR');
+const AIO_GITHUB_TOKEN = getEnvVar('AIO_GITHUB_TOKEN', true);
+const AIO_REPO_SLUG = getEnvVar('AIO_REPO_SLUG', true);
+const AIO_UPLOAD_HOSTNAME = getEnvVar('AIO_UPLOAD_HOSTNAME');
+const AIO_UPLOAD_PORT = +getEnvVar('AIO_UPLOAD_PORT');
+
+// Run
+_main();
+
+// Functions
+function _main() {
+  uploadServerFactory.
+    create(AIO_BUILDS_DIR).
+    on(CreatedBuildEvent.type, createOnBuildCreatedHanlder()).
+    listen(AIO_UPLOAD_PORT, AIO_UPLOAD_HOSTNAME);
+}
+
+function createOnBuildCreatedHanlder() {
+  if (!AIO_REPO_SLUG) {
+    console.warn('No repo specified. Preview links will not be posted on PRs.');
+    return () => null;
+  }
+
+  const githubPullRequests = new GithubPullRequests(AIO_REPO_SLUG, AIO_GITHUB_TOKEN);
+
+  return ({pr, sha}: CreatedBuildEvent) => {
+    const body = `The angular.io preview for ${sha.slice(0, 7)} is available [here][1].\n\n` +
+                 `[1]: https://pr${pr}-${sha}.ngbuilds.io/`;
+
+    githubPullRequests.addComment(pr, body);
+  };
+}