Making Private Route in Flutter

Question

How can I make a wrapper over my private routes, which navigate to screen only when user is authorized, otherwise redirect to login and get back to the original screen after login. How can make this in a generalized way, so that I just reuse it on my other Private future screens?

Solution

If you are using routes parameter in your MaterialApp, you can replace it with following implementation

import 'dart:collection';

import 'package:flutter/widgets.dart';

class ConditionalRouter extends MapMixin<String, WidgetBuilder> {
  final Map<String, WidgetBuilder> public;
  final Map<String, WidgetBuilder> private;

  ConditionalRouter({this.public, this.private});

  @override
  WidgetBuilder operator [](Object key) {
    if (public.containsKey(key))
      return public[key];
    if (private.containsKey(key)) {
      if (MyAuth.isUserLoggedIn)
        return private[key];
      // Adding next page parameter to your Login page
      // will allow you to go back to page, that user were going to
      return (context) => LoginPage(nextPage: key);
    }
    return null;
  }

  @override
  void operator []=(key, value) {}

  @override
  void clear() {}

  @override
  Iterable<String> get keys {
    final set = Set<String>();
    set.addAll(public.keys);
    set.addAll(private.keys);
    return set;
  }

  @override
  WidgetBuilder remove(Object key) {
    return public[key] ?? private[key];
  }
}

And use it like that:

MaterialApp(
  // ...
  routes: ConditionalRouter(
    public: {
      '/start_page': (context) => StartPage()
    },
    private: {
      '/user_profile': (context) => UserProfilePage()
    }
  )
)

Comments

[Ravi Garg]

I am not using streams from my node server for authentication. Still would take a look on it.

[Sachin Bhankhar]

Create a Stream in dart and when user authenticated put data in it.

[Dmytro Rostopira]

I guess, he already has some static var, that says if user is logged in. Also, stream won't solve problem of routing. Also bloc could be an overkill for beginner

[Sergei Eensalu]

Thank you for interesting solution. What are the possibilities to use the async "Auth().isAuth()" function method instead of "MyAuth.isUserLoggedIn" inside your solution? I tried a lot of variants, but no one work :( . Can you help ?

[Dmytro Rostopira]

@SergeiEensalu you just have to create wrapper for Navigator, that's pretty straightforward to do

[Sergei Eensalu]

thank you for fast answer. I am new in Flutter, can you please give an example? :)

[Dmytro Rostopira]

@SergeiEensalu that's not a one-liner comment thing ;) Post this as a separate question, maybe I will find time to answer it later

[Sergei Eensalu]

stackoverflow.com/questions/66012904/…