datatable.directory/routes/login.php

<?php
// auth related routes, using the web middleware

use App\Models\User;
use SocialNorm\Exceptions\ApplicationRejectedException;
use SocialNorm\Exceptions\InvalidAuthorizationCodeException;
use SocialNorm\ProviderUser;

Auth::routes();

Route::get('/auth/confirm-email', 'Auth\ConfirmEmailController@confirmEmailAndLogin')
    ->name('confirm-email')->middleware('auth');

Route::get('/auth/resend-email-confirmation', 'Auth\ConfirmEmailController@resendConfirmation')
    ->name('resend-email-confirmation');

// ----------------- SOCIAL LOGIN --------------------

function _loginVia($method) {
    $wasLoggedIn = !guest();

    try {
        SocialAuth::login($method, function (User $user, ProviderUser $details) use($wasLoggedIn) {
            if ($user->exists && !$wasLoggedIn) {
                // check if this identity already existed
                if (! $user->socialIdentities()
                    ->where('provider', $details->provider)
                    ->where('provider_user_id', $details->id)
                    ->exists()) {
                    Auth::logout();

                    abort(403,
                        "Account with this e-mail already exists. Add the identity
                         to the account manually after logging in through an existing 
                         authentication method.");
                }
            }

            // update user name first time user logs in
            if (!$user->exists) {
                if (!config('app.allow_regs')) {
                    abort(403, "Registrations are closed.");
                }

                $basename = $details->nickname ?: ($details->full_name ?: $details->email);
                $user->name = $basename;
                $cnt = 1;
                while (User::where('name', $user->name)->exists()) {
                    $cnt++;
                    $user->name = $basename . $cnt;
                }
            }

            // set e-mail from provider data, only if user e-mail is empty
            if ("$user->email" === "") {
                $user->email = $details->email;
            }
            $user->confirmed = true; // mark as confirmed, we trust the provider
        });
    } catch (ApplicationRejectedException $e) {
        abort(401, $e->getMessage());
    } catch (InvalidAuthorizationCodeException $e) {
        abort(401, $e->getMessage());
    }

    if ($wasLoggedIn)
        return redirect(route('profile.manage-oauth'));
    else
        return Redirect::intended();
};


Route::get('/auth/github/authorize', function() {
    return SocialAuth::authorize('github');
})->name('oauth-github-authorize');

Route::get('/auth/github/callback', function() {
    return _loginVia('github');
})->name('oauth-github-callback');


Route::get('/auth/google/authorize', function() {
    return SocialAuth::authorize('google');
})->name('oauth-google-authorize');

Route::get('/auth/google/callback', function() {
    return _loginVia('google');
})->name('oauth-google-callback');


Route::get('/auth/facebook/authorize', function() {
    return SocialAuth::authorize('facebook');
})->name('oauth-facebook-authorize');

Route::get('/auth/facebook/callback', function() {
    return _loginVia('facebook');
})->name('oauth-facebook-callback');


/*
Route::get('/auth/stack/authorize', function() {
    return SocialAuth::authorize('stack');
})->name('oauth-stack-authorize');

Route::get('/auth/stack/callback', function() {
    return _loginVia('stack');
})->name('oauth-stack-callback');
*/