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ios twitter login tutorial

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iOS - Twitter and Facebook - Tutorialspoint


In this post, we will take a look at the recommended approach to performing authentication in native iOS apps. Read on! When a user needs to be authenticated in a mobile app there are essentially two options: an internal embedded login screen, or an external login screen. Embedded login screens have been the norm for a long time. The are two issues with this approach:.

The main advantage of embedded login screens is the seamless integration with the rest of the application. There is no screen-switching or extra delays related to switching applications to perform logins.

External login screens, on the other hand, work by delegating the job of authenticating a user to a different application. The main advantages of this approach are:. The main disadvantage is, of course, that delegating authentication to a separate app is not as seamless as an embedded login flow. When it comes to iOS, the external app that handles authentication is usually Safari. By having Safari access an authentication server, login credentials are managed by it. Apple, and other OS manufacturers, put special attention to the way web browsers handle this information, and development is focused on making this secure.

By making the web browser the external app that handles authentication and credentials, security for all native applications is increased. But can we do anything to improve the user experience when using external logins? At Auth0 we developed Centralized Logins to give our users the best of both worlds. Centralized Logins allow developers to customize the login screen that is served by Auth0 when used as an authentication server. Of course, in case developers don't want to customize the login screen, they can use the default Auth0 Lock screen that supports a lot of functionality with minimal coding.

In other words, it can even result in less time spent developing this feature for your app! Before taking a look at how to use this for our iOS apps, we will take a brief look at how this works in the context of OAuth2. OAuth2 is one of the industry-standard technologies implemented by Auth0. OAuth2 is an authorization framework. In practice, OAuth2 can be seen as a protocol for clients to gain access to protected resources managed by different parties.

On the other hand, authentication is the process of confirming the truth of a user's credentials. In simpler terms, letting an application know the identity of the user interacting with it and validating that identity, ios twitter login tutorial.

Authorization is more general than authentication, ios twitter login tutorial, thus OAuth2, an authorization framework, can also be used for authentication purposes. However, since OAuth2 is designed with a bigger scope in mind, to use it for authentication it is necessary to specify with greater detail certain operations. When it comes to mobile apps, ios twitter login tutorial, many applications require the user to identify themselves, or to authenticate. Nowadays, it is very common to delegate that functionality to third-party identity providers such as Facebook, Twitter or Google.

This is known as social login in some circles, but it can be used with any identity provider supported by the authentication system. Each identity provider provides their own authentication and account access process. Some of them, like Google, rely on OAuth2. Others may choose different protocols. Mobile apps have been, for a long time, designing their own authentication and authorization screens. All of these screens must conform to the authentication and authorization process of the identity provider, ios twitter login tutorial.

For example, if Facebook requires a user to authorize a third party application to learn their full name, e-mail address and profile picture, a consent screen must be displayed. This process is entirely controlled by the identity provider. For web applications, this process has always been handled by the web browser. Mobile apps, by virtue of preferring native login screens, have strayed from this path. It is for this reason that the IETF has drafted a document detailing the advantages of also having mobile apps use the web-browser for authorization.

Web browsers on all mobile platforms provide ways for the results of these operations to be sent back to the application that requested them. Furthermore, web browsers are fully prepared by the OS vendor to handle these operations securely. Auth0, which fully conforms to the OpenID Connect specificationprovides an authorization server capable of authenticating and authorizing users through many identity providers using mobile web browsers.

For our examplewe will implement two iOS apps using Swift. Our applications will use Auth0 as the authorization server. One application will interact with the authorization server directly by following the usual OpenID Connect process for authentication.

It will use Safari as the application handling the credentials and the login flow. The other application will use the Auth0 for iOS library to further simplify our code. This library can interact with Safari for us, making things even easier! Both applications fully implement the recommended procedure for mobile authentication, it is up to you to pick whatever you prefer for your own apps.

Since our example will use Auth0 as the authorization server, it is first necessary to set some things up. Fortunately, this is very easy. First, sign up for an Auth0 account if you don't have one already. Then go to the ios twitter login tutorial and create a new client, ios twitter login tutorial. Clients let you create specific settings for each application that interacts with your Auth0 account.

To create a client follow these steps:. You are free to create as many clients as you want to run separate tests with separate mobile apps. We created two different clients, one for each sample app.

These values must ios twitter login tutorial configured in each mobile app's code. Before getting our hands dirty with code, let's take a short overview of how authentication and authorization work in the context of OpenID Connect and OAuth2 for mobile apps.

Ios twitter login tutorial following endpoints are accessed using HTTP requests. Parameters are passed as part of the URL. This endpoint takes a series of parameters that tell the authorization server what type of request is being made, along with what details the client is requesting the server to provide after a successful authorization flow. This also tells the authorization server what type of authentication and authorization is required before moving forward.

This response is handled by a special handler in our application which can be activated by anyone that constructs a URL with the correct URL scheme. If these don't match, then the request is bogus and should be ignored.

For non-native apps, like regular web apps, this prevents CSRF attacks. These parameters tell the authorization server that the returned code must be generated using Proof Key for Code Exchange PKCEios twitter login tutorial method that improves security for mobile applications by making it harder to use returned codes intercepted by other applications ios twitter login tutorial on the same device.

For mobile applications, it is always a good idea to use PKCE. That's it! If ios twitter login tutorial user picks Facebook, Auth0 will redirect the user to Facebook to login and authorize the access to the requested data from the user, such as his email and profile picture. This authorization code can be used to make further calls to the authorization server.

In particular, the code can be exchanged for an access token which will allow us to do other things, like get user profile information, and call other APIs. Using the web browser for this part of the ios twitter login tutorial flow is great for improving the user experience! For example, if the user had picked Facebook and they were not logged-in, they could use Safari password autocomplete to make things easier.

On the other hand, if they were already logged in using Safari, there would be no need for the user to type their credentials! It is easy to find many different ways in which the user experience is improved by using the web browser ios twitter login tutorial the central login hub for all mobile apps.

This is what we call Centralized Login. Now that the user has ios twitter login tutorial and completed the initial authorization flow, it is time to turn the authorization code into something useful, ios twitter login tutorial. To request new tokens, the client must provide either a token usually a refresh tokenor a one-time authorization code. Wow, so many types of tokens! Want to know what they are used for? Check the "Tokens" doc at Auth0, ios twitter login tutorial.

Of course, ios twitter login tutorial, common mobile apps are more complex. We will skip how to do this in this tutorial because that is out of scope, but if you are new to iOS development, do check Apple's docs. All of the authorization code is in a separate class: Ios twitter login tutorial :. The authorize function first generates the code challenge and then constructs the URL for the request.

This way, when a URL containing that scheme is opened by Safari, control can ios twitter login tutorial passed to that application instead. We also need to enable which URLs are valid in the Auth0 dashboard. The SFAuthenticationSession class provides a callback that is called after the redirect is performed by the authorization server. This callback carries the URL, so it is very convenient. No other steps or handlers are required.

In contrast, by using the older UIApplication. To claim this URL for our application, it must be configured in the Info. The code and state elements are returned as part of the redirect URL. By parsing it we can access them. If these elements are not present, the URL ios twitter login tutorial invalid and an error has occurred. Inspect the URL to get information about the error. Once we have the code and state parameters we are ready to exchange them for an access token!

 

Authenticate Using Twitter on Android | Firebase

 

ios twitter login tutorial

 

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