Migrate server setup functionality

Changes:
- Check if admin is set up
- Redirect to admin setup if not already done
- Create admin password
- Login as admin and get access token for future requests
- Add a router for setup
- Middleware to prevent any route from being accessible on the server till the admin setup is done

GitLab: #80
GitLab: #73

Change-Id: I8b7ecab68f6b4d5c6313ce2e72a4ae4fdef9eda0
diff --git a/server/src/admin-config.ts b/server/src/admin-config.ts
new file mode 100644
index 0000000..b52d608
--- /dev/null
+++ b/server/src/admin-config.ts
@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2022 Savoir-faire Linux Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation; either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public
+ * License along with this program.  If not, see
+ * <https://www.gnu.org/licenses/>.
+ */
+import { readFileSync } from 'node:fs';
+import { writeFile } from 'node:fs/promises';
+
+import { Service } from 'typedi';
+
+@Service()
+export class AdminConfig {
+  private readonly file = 'admin.json';
+  private account: { admin: string };
+
+  constructor() {
+    let buffer: Buffer;
+
+    try {
+      buffer = readFileSync(this.file);
+    } catch (e) {
+      console.error(e);
+      buffer = Buffer.from('{}');
+    }
+
+    this.account = JSON.parse(buffer.toString());
+  }
+
+  get() {
+    return this.account.admin;
+  }
+
+  set(password: string) {
+    this.account.admin = password;
+  }
+
+  async save() {
+    await writeFile(this.file, JSON.stringify(this.account) + '/n');
+  }
+}