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ReCaptcha

Integrate reCAPTCHA using async HTTP/3, making your app fast with a few lines.

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Requirements

• Laravel 10 or later

Installation

You can install the package via Composer:

Set up

Add the reCAPTCHA keys for your site to the environment file of your project. You can add each of them for reCAPTCHA v2 checkbox, invisible, Android, and score.

If you don't have one, generate it in your reCAPTCHA Admin panel.

This allows you to check different reCAPTCHA mechanisms using the same application, in different environments.

[!NOTE]

ReCaptcha already comes with v2 keys for local development. For v3, you will need to create your own set of credentials once on production.

Usage

Usage differs based on if you're using checkbox, invisible, Android challenges, or the v3 score-driven challenge.

Checkbox, invisible and Android challenges

After you integrate reCAPTCHA into your frontend or Android app, set the ReCaptcha middleware in the POST routes where a form with reCAPTCHA is submitted. The middleware will catch the g-recaptcha-response input (you can change it later) and check if it's valid.

To declare the middleware just use the ReCaptcha middleware builder:

• ReCaptcha::checkbox() for explicitly rendered checkbox challenges.
• ReCaptcha::invisible() for invisible challenges.
• ReCaptcha::android() for Android app challenges.

If for some reason the challenge is not a success, the validation will immediately kick in and throw a ValidationException, returning the user back to the form.

Remembering challenges

To avoid asking for challenges over and over again, you can "remember" the challenge for a given set of minutes. This can be enabled globally, but you may prefer to do it in a per-route basis.

Simple use the remember() method. You can set the number of minutes to override the global parameter. Alternatively, rememberForever() will remember the challenge forever.

You should use this in conjunction with the @robot directive in your Blade templates to render a challenge when the user has not successfully done one before.

[!TIP]

Good places to remember a challenge for some minutes are forms which are expected to fail, or when you have multiple forms the user may jump between.

Changing the input name

You can change the input name from g-recaptcha-response, which is the default, to anything using input().

Score-driven challenge

The reCAPTCHA v3 middleware works differently from v2. This response is always a success, but the challenge scores between 0.0 and 1.0. Human-like interaction will be higher, while robots will score lower. The default threshold is 0.5, but this can be changed globally or per-route.

To start using it, simply use the ReCaptcha::score() method to your route.

Once the challenge has been received in your controller, you will have access to two methods from the Request class or instance: isHuman() and isRobot(), which may return true or false:

You can also have access to the response from reCAPTCHA using the response() method of the ReCaptcha facade:

[!WARNING]

Be careful of calling response(), as it will throw an exception on controllers without challenges.

Threshold, action and input name

The middleware accepts three additional parameters using the middleware helper.

1. threshold(): The value that must be above or equal to be considered human.
2. action(): The action name to optionally check against.
3. input(): The name of the reCAPTCHA input to verify.

[!IMPORTANT]

When checking the action name, ensure your frontend action matches with the expected in the middleware.

Bypassing on authenticated users

Sometimes you may want to bypass reCAPTCHA checks when there is an authenticated user, or automatically receive it as a "human" on score-driven challenges, specially on recurrent actions or when the user already has completed a challenge (like on logins).

To exclude authenticated user you can use forGuests(), and specify the guards if necessary.

Then, in your blade files, you can easily skip the challenge with the @guest or @auth directives.

Faking reCAPTCHA scores

You can easily fake a reCAPTCHA response score in your local development by setting RECAPTCHA_FAKE to true.

This environment variable allows to fake a robot responses by filling the is_robot input in your form.

Confirmation middleware

ReCaptcha comes with a handy middleware to confirm with a simple reCAPTCHA Checkbox challenge, much like the password confirmation middleware included in Laravel.

First, set the route to protect using the recaptcha.confirm middleware.

Once done, ensure you have also a recaptcha.confirm route to receive the redirected user, and one to receive the challenge at the same path (as the view POST request does). ReCaptcha comes with a controller and a basic view that you can use out of the box:

When the user tries to enter the route, it will be redirected to the view asking to resolve a reCAPTCHA challenge. Once done, it will be redirected to the intended URL.

The middleware it's compatible with remembering challenges, and will use the default amount of time to not ask again if remembering only when it's enabled globally, otherwise it will be asked to confirm every time.

You can configure the route name and the guards to bypass the confirmation if the user is authenticated after the first argument.

Frontend integration

Check the official reCAPTCHA documentation to integrate the reCAPTCHA script in your frontend, or inside your Android application.

You can use the recaptcha() helper to output the site key depending on the challenge version you want to render: checkbox, invisible, android or score (v3).

Advanced configuration

ReCaptcha is intended to work out-of-the-box, but you can publish the configuration file for fine-tuning the reCAPTCHA verification.

You will get a config file with this array:

Enable Switch

By default, ReCaptcha is disabled, so it doesn't check reCAPTCHA challenges, and on score-driven routes it will always resolve them as human interaction.

You can enable it with the RECAPTCHA_ENABLE environment variable.

This can be handy to enable on some local or development environments to check real interaction using the included localhost test keys, which only work on localhost.

[!IMPORTANT]

When switched off, the reCAPTCHA v2 challenges are not validated in the Request input, so you can safely disregard any frontend script or reCAPTCHA tokens or boxes.

Fake responses

If ReCaptcha is fake v3-score responses from reCAPTCHA servers. For v2 challenges, setting this to true bypasses the challenge verification.

You should enable it for running unit tests.

[!WARNING]

Remember to disable faking on production. Not doing so will fake all score challenges as human, not requiring the challenge token.

Hostname and APK Package Name

If you are not verifying the Hostname or APK Package Name in your reCAPTCHA Admin Panel, may be because you use multiple hostnames or apps, you will have to issue them in the environment file.

When the reCAPTCHA response from the servers is retrieved, it will be checked against these values when present. In case of mismatch, a validation exception will be thrown.

Threshold

The default threshold to check against reCAPTCHA v3 challenges. Values equal or above will be considered "human".

If you're not using reCAPTCHA v3, or you're fine with the default, leave this alone. You can still override the default in a per-route basis.

Remember

Remembering the user once a V2 challenge is successful is disabled by default.

It's recommended to use a per-route basis "remember" if you expect only some routes to remember challenges, instead of the whole application.

This also control how many minutes to set the "remember". You can set INF constant to remember the challenge forever (or until the session expires).

HTTP Client options

This array sets the options for the outgoing request to reCAPTCHA servers. This is handled by Guzzle, which in turn will pass it to the underlying transport. Depending on your system, it will probably be cURL.

By default, it instructs Guzzle to use HTTP/3 whenever possible.

Credentials

Here is the full array of reCAPTCHA credentials to use depending on the version. Do not change the array unless you know what you're doing.

Developing with ReCaptcha v2

On local development, let the default testing keys be used. These are meant to be used on local development, so in production you can easily change them for real keys.

On unit testing, the middleware will detect the environment and skip the mandatory challenge check. There is no need to disable ReCaptcha.

Developing with ReCaptcha v3 (score)

On local development and unit testing, the middleware and will automatically create human responses. There is no need to enabling faking is mandatory to enable faking robot responses using is_robot on live requests.

Inside your tests, you can fake a response made by a human or robot by simply using the fakeHuman() and fakeRobot() methods, which will score 1.0 or 0.0 respectively for all subsequent requests.

[!NOTE]

Fake responses don't come with actions, hostnames or APK package names, so these are not validated.

Alternatively, fakeScore() method will fake responses with any score you set.

PhpStorm stubs

For users of PhpStorm, there is a stub file and a meta file to aid in macro autocompletion for this package. You can publish them using the phpstorm tag:

The file gets published into the .stubs folder of your project, while the meta is located inside .phpstorm.meta.php directory. You should point your PhpStorm to these stubs.

Laravel Octane compatibility

• The only singleton registered is the ReCaptcha class, which uses a stale config instance. You shouldn't change the config.
• There are no static properties written during a request.

There should be no problems using this package with Laravel Octane as intended.

HTTP/3 and cURL

To use HTTP/3, ensure you're using PHP 8.2 or later. cURL version 7.66 supports HTTP/3, and latest PHP 8.2 uses version 7.85.

For more information about checking if your platform can make HTTP/3 requests, check this PHP Watch article.

Security

If you discover any security related issues, please email [email protected] instead of using the issue tracker.

License

This specific package version is licensed under the terms of the MIT License, at time of publishing.

Laravel is a Trademark of Taylor Otwell. Copyright © 2011-2024 Laravel LLC.