react-native-hcaptcha

hCaptcha wrapper for React Native (Android and iOS)

Installation

1. Install package:

• Using NPM npm install @hcaptcha/react-native-hcaptcha
• Using Yarn yarn add @hcaptcha/react-native-hcaptcha

2. Import package: import ConfirmHcaptcha from '@hcaptcha/react-native-hcaptcha';

Full examples for expo and react-native, as well as debugging guides, are in MAINTAINER.md

Demo

See live demo in Snack.

Usage

See Example.App.js example in repo for a fully worked example implementation.

For users familiar with the hCaptcha JS API, calling show() in this wrapper triggers an hcaptcha.execute() call.

This means that if you are an Enterprise user with a 99.9% passive or purely passive sitekey configured, no additional work is required to get the expected behavior: either a visual challenge will be shown or a token will be returned immediately via onMessage, in accordance with your configuration.

Also, please note the following special message strings that can be returned via onMessage:

name	purpose
expired	passcode response expired and the user must re-verify, or did not answer before session expired
error	there was an error displaying the challenge
cancel	the user closed the challenge
open	the visual challenge was opened

Any other string returned by onMessage will be a passcode.

Handling the post-issuance expiration lifecycle

This extension is a lightweight wrapper, and does not currently attempt to manage post-verification state in the same way as the web JS API, e.g. with an on-expire callback.

In particular, if you do not plan to immediately consume the passcode returned by submitting it to your backend, you should start a timer to let your application state know that a new passcode is required when it expires.

By default, this value is 120 seconds. So, an expired error will be emitted to onMessage if you haven't called event.markUsed().

Once you've utilized hCaptcha's token, call markUsed on the event object in onMessage:

  onMessage = event => {
    if (event && event.nativeEvent.data) {
      if (['cancel'].includes(event.nativeEvent.data)) {
        this.captchaForm.hide();
      } else if (['error'].includes(event.nativeEvent.data)) {
        this.captchaForm.hide();
        // handle error
      } else {
        this.captchaForm.hide();
        const token = event.nativeEvent.data;
        // utlize token and call markUsed once you done with it
        event.markUsed();
      }
    }
  };
  ...
  <ConfirmHcaptcha
    ref={_ref => (this.captchaForm = _ref)}
    siteKey={siteKey}
    languageCode="en"
    onMessage={this.onMessage}
  />

Handling errors and retry

If your app encounters an error event, you can reset the hCaptcha SDK flow by calling `event.reset()`` to perform another attempt at verification.

Dependencies

1. react-native-modal

2. react-native-webview

Building on iOS

Required frameworks/libraries

Your app must have the following frameworks/libraries linked:

• libswiftWebKit.tbd
• JavaScriptCore.framework

Flipper version

You must have a recent version of flipper to build this app. If you have upgraded React Native recently, your Flipper version may be out of date. This will cause compilation errors.

Your Podfile should be updated to something like:

  # Enables Flipper.
  #
  # Note that if you have use_frameworks! enabled, Flipper will not work and
  # you should disable these next few lines.
  use_flipper!({ 'Flipper-Folly' => '2.5.3', 'Flipper' => '0.87.0', 'Flipper-RSocket' => '1.3.1' })
  post_install do |installer|
    flipper_post_install(installer)
  end

If you encounter build-time errors related to Flipper.

Localization

Make sure the value you pass to languageCode is the one the user has set in your app if you allow them to override the system defaults.

Otherwise, you should pass in the preferred device locale, e.g. fetched from getLocales() if using react-native-localize.

Notes

• The UI defaults to the "invisible" mode of the JS SDK, i.e. no checkbox is displayed.
• You can import Hcaptcha from '@hcaptcha/react-native-hcaptcha/Hcaptcha'; to customize the UI yourself.

Properties

Name	Type	Description
siteKey (required)	string	The hCaptcha siteKey
size	string	The size of the checkbox, can be 'invisible', 'compact' or 'checkbox', Default: 'invisible'
onMessage	Function (see here)	The callback function that runs after receiving a response, error, or when user cancels.
languageCode	string	Default language for hCaptcha; overrides phone defaults. A complete list of supported languages and their codes can be found here
showLoading	boolean	Whether to show a loading indicator while the hCaptcha web content loads
loadingIndicatorColor	string	Color of the ActivityIndicator
backgroundColor	string	The background color code that will be applied to the main HTML element
theme	string|object	The theme can be 'light', 'dark', 'contrast' or a custom theme object (see Enterprise docs)
rqdata	string	Hcaptcha execution options (see Enterprise docs)
sentry	boolean	sentry error reporting (see Enterprise docs)
jsSrc	string	The url of api.js. Default: https://js.hcaptcha.com/1/api.js (Override only if using first-party hosting feature.)
endpoint	string	Point hCaptcha JS Ajax Requests to alternative API Endpoint. Default: https://api.hcaptcha.com (Override only if using first-party hosting feature.)
reportapi	string	Point hCaptcha Bug Reporting Request to alternative API Endpoint. Default: https://accounts.hcaptcha.com (Override only if using first-party hosting feature.)
assethost	string	Points loaded hCaptcha assets to a user defined asset location, used for proxies. Default: https://newassets.hcaptcha.com (Override only if using first-party hosting feature.)
imghost	string	Points loaded hCaptcha challenge images to a user defined image location, used for proxies. Default: https://imgs.hcaptcha.com (Override only if using first-party hosting feature.)
host	string	hCaptcha SDK host identifier. null value means that it will be generated by SDK
url (inline component only)	string	The url domain defined on your hCaptcha. You generally will not need to change this.
style (inline component only)	ViewStyle (see here)	The webview style
baseUrl (modal component only)	string	The url domain defined on your hCaptcha. You generally will not need to change this.
passiveSiteKey (modal component only)	boolean	Indicates whether the passive mode is enabled; when true, the modal won't be shown at all
hasBackdrop (modal component only)	boolean	Defines if the modal backdrop is shown (true by default)
orientation	string	This specifies the "orientation" of the challenge. It can be portrait, landscape. Default: portrait

Status

Fully functional, but additional releases will be made in the near term.

Changes within the same major release are expected to be additive, i.e. non-breaking.

License

MIT License. (C) 2021 hCaptcha.

Credits: Originally forked from xuho and filipepiresg's Google reCAPTCHA v2 work. (MIT license)