Microsoft Azure B2C OAuth2 Provider for Laravel Socialite

1. Installation

// This assumes that you have composer installed globally
composer require rinkp/socialite-azureb2c

2. Service provider

Remove Laravel\Socialite\SocialiteServiceProvider from your providers[] array in config\app.php if you have added it already.
Add \SocialiteProviders\Manager\ServiceProvider::class to your providers[] array in config\app.php.

For example:

'providers' => [
    // a whole bunch of providers
    // remove 'Laravel\Socialite\SocialiteServiceProvider',
    \SocialiteProviders\Manager\ServiceProvider::class, // add
];

3. Event listener

For signing in (required):
- Add the \SocialiteProviders\Manager\SocialiteWasCalled::class event to your listen array, if it wasn't added already.
- Add the SocialiteProviders\\AzureB2C\\AzureB2CExtendSocialite@handle listener event to the SocialiteWasCalled event.
For single sign out (optional):
- Add the Illuminate\Auth\Events\Logout::class event to your listen array, if it wasn't added already.
- Add the SocialiteProviders\\AzureB2C\\AzureB2CExtendSocialite@logOut listener event to the Logout event.

class EventServiceProvider extends ServiceProvider
{
    /**
     * ...
     */
    protected $listen = [
        /* ... */

        \SocialiteProviders\Manager\SocialiteWasCalled::class => [
            'SocialiteProviders\\AzureB2C\\AzureB2CExtendSocialite@handle',
        ],

        Illuminate\Auth\Events\Logout::class => [
            'SocialiteProviders\\AzureB2C\\AzureB2CExtendSocialite@logOut',
        ],

        /* ... */
    ];
}

See also the SocialiteProviders/Manager documentation.

4. Configuration setup

In config/services.php you can set the required configuration.

Setting
client_id	Azure App Registration Client ID
client_secret	Azure App Registration Client Secret
redirect	Callback URL
redirect_logout	Where to redirect after a successful single sign-out
tenant	A verified domain associated with the tenant
tenant_name	The name of your tenant (the part before .onmicrosoft.com or .b2clogin.com)
flow_name	The name of the flow registered in the directory
cache_time	For how long the OpenID configuration and JWT keys need to be cached

return [
    /* ... */

    'azureb2c' => [
        'client_id' => env('AZUREB2C_CLIENT_ID'),
        'client_secret' => env("AZUREB2C_CLIENT_SECRET"),
        'redirect' => env("AZUREB2C_REDIRECT_URL"),
        'redirect_logout' => env("AZUREB2C_LOGOUT_URL"),
        'tenant' => env("AZUREB2C_TENANT", env("AZUREB2C_TENANT_NAME") . ".onmicrosoft.com"),
        'tenant_name' => env("AZUREB2C_TENANT_NAME"),
        'flow_name' => env("AUZREB2C_FLOW_NAME"),
        'cache_time' => env("AUZREB2C_CACHE_TIME")
    ],

    /* ... */
];