update command

src/commands/update.command.ts

@@ -0,0 +1,62 @@
+import * as program from 'commander';
+import * as fetch from 'node-fetch';
+
+import { PlatformUtilsService } from 'jslib/abstractions/platformUtils.service';
+
+import { Response } from '../models/response';
+import { MessageResponse } from '../models/response/messageResponse';
+
+export class UpdateCommand {
+    constructor(private platformUtilsService: PlatformUtilsService) { }
+
+    async run(cmd: program.Command): Promise<Response> {
+        const currentVersion = this.platformUtilsService.getApplicationVersion();
+
+        const response = await fetch.default('https://api.github.com/repos/bitwarden/cli/releases/latest');
+        if (response.status === 200) {
+            const responseJson = await response.json();
+            const res = new MessageResponse(null, null);
+
+            const tagName: string = responseJson.tag_name;
+            if (tagName === ('v' + currentVersion)) {
+                res.title = 'No update available.';
+                res.noColor = true;
+                return Response.success(res);
+            }
+
+            let downloadUrl: string = null;
+            if (responseJson.assets != null) {
+                for (const a of responseJson.assets) {
+                    const download: string = a.browser_download_url;
+                    if (download == null) {
+                        continue;
+                    }
+
+                    if (process.platform === 'win32' && download.indexOf('bw-windows.zip') > -1) {
+                        downloadUrl = download;
+                        break;
+                    } else if (process.platform === 'darwin' && download.indexOf('bw-macos.zip') > -1) {
+                        downloadUrl = download;
+                        break;
+                    } else if (process.platform === 'linux' && download.indexOf('bw-linux.zip') > -1) {
+                        downloadUrl = download;
+                        break;
+                    }
+                }
+            }
+
+            res.title = 'A new version is available: ' + tagName;
+            if (downloadUrl == null) {
+                downloadUrl = 'https://github.com/bitwarden/cli/releases';
+            } else {
+                res.raw = downloadUrl;
+            }
+            res.message = 'You can download this update at: ' + downloadUrl + '\n' +
+                'If you installed this CLI through a package manager ' +
+                'you should probably update using its update command instead.';
+            return Response.success(res);
+        } else {
+            return Response.error('Error contacting update API: ' + response.status);
+        }
+    }
+}