Add fullstack example

examples/fullstack/backend/app/middleware/auth_middleware.ts

@@ -0,0 +1,25 @@
+import type { HttpContext } from '@adonisjs/core/http'
+import type { NextFn } from '@adonisjs/core/types/http'
+import type { Authenticators } from '@adonisjs/auth/types'
+
+/**
+ * Auth middleware is used authenticate HTTP requests and deny
+ * access to unauthenticated users.
+ */
+export default class AuthMiddleware {
+  /**
+   * The URL to redirect to, when authentication fails
+   */
+  redirectTo = '/login'
+
+  async handle(
+    ctx: HttpContext,
+    next: NextFn,
+    options: {
+      guards?: (keyof Authenticators)[]
+    } = {}
+  ) {
+    await ctx.auth.authenticateUsing(options.guards, { loginRoute: this.redirectTo })
+    return next()
+  }
+}