Using Passwordless Authentication on iOS with emails - Objective C
With an email connection, the user is asked to enter their email address, to which Auth0 sends a one-time code. The user then enters the code into your application.
If the email address attached to the code matches an existing user, Auth0 authenticates the user:
If the user is new, their user profile is created for the
On mobile platforms, your app will receive an ID Token, the user profile, and optionally, a Refresh Token.
Configure an email provider
By default, Auth0 sends the email from its own SMTP provider. Auth0's built-in email infrastructure should be used for testing-level emails only. You can configure your own email provider to better monitor and troubleshoot the email service as well as be able to fully customize the emails.
Configure the connection
- Navigate to the Connections > Passwordless page in the Auth0 Dashboard, and enable the Email toggle.
- Select your Email Syntax, and enter your email's From, Subject, and Message text.
Enter any Authentication Parameters you would like to include in the generated sign-in link.
Adjust settings for your OTP Expiry and OTP Length, and click SAVE.
The Message area supports multiple languages.
To choose the language, call the /passwordless/start authentication endpoint and set the value of the 'x-request-language' header. When this header is not set, the language is extracted from the 'accept-language' header, which is automatically set by the browser.
The Message area accepts Liquid syntax. You can use this syntax, combined with exposed parameter values, to programmatically construct elements of the message. For example, you can reference the
request_language parameter to change the language of the message:
The following parameters are available when defining the message template:
||The password to use|
||The generated sign-in link|
||The name of the application with which the user is signing up|
||The requested language for message content|
||Indicates when the template has been triggered by an update to a user's email via the API. Equals
Enable your apps
Click the Apps tab, and enable the apps for which you would like to use Passwordless Email.
Using Auth0 Lock
Lock is a widget that allows you to easily integrate Auth0's Passwordless Authentication into your iOS applications.
After installing and configuring Lock.iOS-OSX, you will be able to use Lock as follows.
When this code runs, it will ask the user for their email address:
Then Auth0 will send to the user an email containing the one-time code:
Lastly, the user enters the one-time password into Lock. Then, if the password is correct, the user is authenticated.
This code will call
onAuthenticationBlock, where the ID Token, Refresh Token, and user profile are typically stored. Then the user will be allowed to continue to the authenticated part of the application.
Using your own UI
If you choose to build your own UI, your code will need to ask the user for their email address first. Then call the following method:
After the <passwordless login process begins, ask the user for the one-time code. Then authenticate using that code:
With an email connection, the user is asked to enter their email address, to which Auth0 usually sends a one-time code. Instead, you can configure Auth0 to send a magic link.
The user then clicks the button or link in the email and is automatically signed in to your application.
Lastly, once the user is authenticated, your app will be able to access the user profile and tokens returned by Auth0.