1 files changed, 56 insertions, 0 deletions

diff --git a/app/Middleware/AllowGuestOnly.ts b/app/Middleware/AllowGuestOnly.ts
new file mode 100644
index 0000000..ee43571
--- /dev/null
+++ b/app/Middleware/AllowGuestOnly.ts
@@ -0,0 +1,56 @@
+import { GuardsList } from '@ioc:Adonis/Addons/Auth';
+import { HttpContextContract } from '@ioc:Adonis/Core/HttpContext';
+import { AuthenticationException } from '@adonisjs/auth/build/standalone';
+
+/**
+ * This is actually a reverted a reverted auth middleware available in ./Auth.ts
+ * provided by the AdonisJS project iself.
+ */
+export default class GuestMiddleware {
+  /**
+   * The URL to redirect to when request is authorized
+   */
+  protected redirectTo = '/dashboard';
+
+  protected async authenticate(
+    auth: HttpContextContract['auth'],
+    guards: (keyof GuardsList)[],
+  ) {
+    let guardLastAttempted: string | undefined;
+
+    for (const guard of guards) {
+      guardLastAttempted = guard;
+
+      // eslint-disable-next-line no-await-in-loop
+      if (await auth.use(guard).check()) {
+        auth.defaultGuard = guard;
+
+        throw new AuthenticationException(
+          'Unauthorized access',
+          'E_UNAUTHORIZED_ACCESS',
+          guardLastAttempted,
+          this.redirectTo,
+        );
+      }
+    }
+  }
+
+  /**
+   * Handle request
+   */
+  public async handle(
+    { auth }: HttpContextContract,
+    next: () => Promise<void>,
+    customGuards: (keyof GuardsList)[],
+  ) {
+    /**
+     * Uses the user defined guards or the default guard mentioned in
+     * the config file
+     */
+    const guards = customGuards.length > 0 ? customGuards : [auth.name];
+
+    await this.authenticate(auth, guards);
+
+    await next();
+  }
+}