pixelfed/app/Http/Controllers/Auth/RegisterController.php

<?php

namespace App\Http\Controllers\Auth;

use App\User;
use App\Util\Lexer\RestrictedNames;
use App\Http\Controllers\Controller;
use Illuminate\Support\Facades\Hash;
use Illuminate\Support\Facades\Validator;
use Illuminate\Foundation\Auth\RegistersUsers;

class RegisterController extends Controller
{
    /*
    |--------------------------------------------------------------------------
    | Register Controller
    |--------------------------------------------------------------------------
    |
    | This controller handles the registration of new users as well as their
    | validation and creation. By default this controller uses a trait to
    | provide this functionality without requiring any additional code.
    |
    */

    use RegistersUsers;

    /**
     * Where to redirect users after registration.
     *
     * @var string
     */
    protected $redirectTo = '/home';

    /**
     * Create a new controller instance.
     *
     * @return void
     */
    public function __construct()
    {
        $this->middleware('guest');
        $this->openRegistrationCheck();
    }

    /**
     * Get a validator for an incoming registration request.
     *
     * @param  array  $data
     * @return \Illuminate\Contracts\Validation\Validator
     */
    protected function validator(array $data)
    {
        $this->validateUsername($data['username']);
        $usernameRules = [
            'required',
            'alpha_dash',
            'min:2',
            'max:15',
            'unique:users',
            function($attribute, $value, $fail) {
                if(!ctype_alpha($value[0])) {
                    return $fail($attribute . ' is invalid. Username must be alpha-numeric and start with a letter.');
                }
            }
        ];        

        $rules = [
            'name' => 'required|string|max:' . config('pixelfed.max_name_length'),
            'username' => $usernameRules,
            'email' => 'required|string|email|max:255|unique:users',
            'password' => 'required|string|min:6|confirmed',
        ];

        if(config('pixelfed.recaptcha')) {
            $rules['g-recaptcha-response'] = 'required|recaptcha';
        }

        return Validator::make($data, $rules);
    }

    /**
     * Create a new user instance after a valid registration.
     *
     * @param  array  $data
     * @return \App\User
     */
    protected function create(array $data)
    {
        return User::create([
            'name' => $data['name'],
            'username' => $data['username'],
            'email' => $data['email'],
            'password' => Hash::make($data['password']),
        ]);
    }

    public function validateUsername($username)
    {
        $restricted = RestrictedNames::get();

        if(in_array($username, $restricted)) {
            return abort(403);
        }
    }

    public function openRegistrationCheck()
    {
        $openRegistration = config('pixelfed.open_registration');
        if(false == $openRegistration) {
            abort(403);
        }
    }
}