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Filename : ThrottlesLogins.php
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<?php

namespace Illuminate\Foundation\Auth;

use Illuminate\Support\Str;
use Illuminate\Http\Request;
use Illuminate\Cache\RateLimiter;
use Illuminate\Auth\Events\Lockout;
use Illuminate\Support\Facades\Lang;

trait ThrottlesLogins
{
    /**
     * Determine if the user has too many failed login attempts.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return bool
     */
    protected function hasTooManyLoginAttempts(Request $request)
    {
        return $this->limiter()->tooManyAttempts(
            $this->throttleKey($request), $this->maxAttempts(), $this->decayMinutes()
        );
    }

    /**
     * Increment the login attempts for the user.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return void
     */
    protected function incrementLoginAttempts(Request $request)
    {
        $this->limiter()->hit($this->throttleKey($request));
    }

    /**
     * Redirect the user after determining they are locked out.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return \Illuminate\Http\RedirectResponse
     */
    protected function sendLockoutResponse(Request $request)
    {
        $seconds = $this->limiter()->availableIn(
            $this->throttleKey($request)
        );

        $message = Lang::get('auth.throttle', ['seconds' => $seconds]);

        $errors = [$this->username() => $message];

        if ($request->expectsJson()) {
            return response()->json($errors, 423);
        }

        return redirect()->back()
            ->withInput($request->only($this->username(), 'remember'))
            ->withErrors($errors);
    }

    /**
     * Clear the login locks for the given user credentials.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return void
     */
    protected function clearLoginAttempts(Request $request)
    {
        $this->limiter()->clear($this->throttleKey($request));
    }

    /**
     * Fire an event when a lockout occurs.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return void
     */
    protected function fireLockoutEvent(Request $request)
    {
        event(new Lockout($request));
    }

    /**
     * Get the throttle key for the given request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return string
     */
    protected function throttleKey(Request $request)
    {
        return Str::lower($request->input($this->username())).'|'.$request->ip();
    }

    /**
     * Get the rate limiter instance.
     *
     * @return \Illuminate\Cache\RateLimiter
     */
    protected function limiter()
    {
        return app(RateLimiter::class);
    }

    /**
     * Get the maximum number of attempts to allow.
     *
     * @return int
     */
    public function maxAttempts()
    {
        return property_exists($this, 'maxAttempts') ? $this->maxAttempts : 5;
    }

    /**
     * Get the number of minutes to throttle for.
     *
     * @return int
     */
    public function decayMinutes()
    {
        return property_exists($this, 'decayMinutes') ? $this->decayMinutes : 1;
    }
}