adonisjs

adonisjs/simple/app/middleware/guest_middleware.ts

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+import type { HttpContext } from '@adonisjs/core/http'
+import type { NextFn } from '@adonisjs/core/types/http'
+import type { Authenticators } from '@adonisjs/auth/types'
+
+/**
+ * Guest middleware is used to deny access to routes that should
+ * be accessed by unauthenticated users.
+ *
+ * For example, the login page should not be accessible if the user
+ * is already logged-in
+ */
+export default class GuestMiddleware {
+  /**
+   * The URL to redirect to when user is logged-in
+   */
+  redirectTo = '/'
+
+  async handle(
+    ctx: HttpContext,
+    next: NextFn,
+    options: { guards?: (keyof Authenticators)[] } = {}
+  ) {
+    for (let guard of options.guards || [ctx.auth.defaultGuard]) {
+      if (await ctx.auth.use(guard).check()) {
+        return ctx.response.redirect(this.redirectTo, true)
+      }
+    }
+
+    return next()
+  }
+}