# reCAPTCHA

Author:    Jason L Perry (http://ambethia.com)<br/>
Copyright: Copyright (c) 2007-2013 Jason L Perry<br/>
License:   [MIT](http://creativecommons.org/licenses/MIT/)<br/>
Info:      https://github.com/ambethia/recaptcha<br/>
Bugs:      https://github.com/ambethia/recaptcha/issues<br/>

This plugin adds helpers for the [reCAPTCHA API](https://www.google.com/recaptcha). In your
views you can use the `recaptcha_tags` method to embed the needed javascript,
and you can validate in your controllers with `verify_recaptcha` or `verify_recaptcha!`,
which throws an error on failiure.

## Rails Installation

[obtain a reCAPTCHA API key](https://www.google.com/recaptcha/admin).

```Ruby
gem "recaptcha", require: "recaptcha/rails"
```

Keep keys out of the code base with environment variables.<br/>
Set in production and locally use [dotenv](https://github.com/bkeepers/dotenv), make sure to add it above recaptcha.

Otherwise see [Alternative API key setup](#alternative-api-key-setup).

```
export RECAPTCHA_PUBLIC_KEY  = '6Lc6BAAAAAAAAChqRbQZcn_yyyyyyyyyyyyyyyyy'
export RECAPTCHA_PRIVATE_KEY = '6Lc6BAAAAAAAAKN3DRm6VA_xxxxxxxxxxxxxxxxx'
```

Add `recaptcha_tags` to the forms you want to protect.

```Erb
<%= form_for @foo do |f| %>
  # ... other tags
  <%= recaptcha_tags %>
  # ... other tags
<% end %>
```

And, add `verify_recaptcha` logic to each form action that you've protected.

```Ruby
# app/controllers/users_controller.rb
@user = User.new(params[:user].permit(:name))
if verify_recaptcha(model: @user) && @user.save
  redirect_to @user
else
  render 'new'
end
```

## Sinatra / Rack / Ruby installation

See [sinatra demo](/demo/sinatra) for details.

 - add `gem 'recaptcha'` to `Gemfile`
 - set env variables
 - `include Recaptcha::ClientHelper` where you need `recaptcha_tags`
 - `include Recaptcha::Verify` where you need `verify_recaptcha`

## recaptcha_tags

Some of the options available:

| Option      | Description |
|-------------|-------------|
| :noscript   | Include <noscript> content (default `true`)|
| :display    | Takes a hash containing the `theme` and `tabindex` options per the API. (default `nil`), options: 'red', 'white', 'blackglass', 'clean', 'custom'|
| :ajax       | Render the dynamic AJAX captcha per the API. (default `false`)|
| :public_key | Override public API key |
| :error      | Override the error code returned from the reCAPTCHA API (default `nil`)|
| :size       | Specify a size (default `nil`)|
| :hl         | Optional. Forces the widget to render in a specific language. Auto-detects the user's language if unspecified. (See [language codes](https://developers.google.com/recaptcha/docs/language)) |

You can also override the html attributes for the sizes of the generated `textarea` and `iframe`
elements, if CSS isn't your thing. Inspect the source of `recaptcha_tags` to see these options.

## verify_recaptcha

This method returns `true` or `false` after processing the parameters from the reCAPTCHA widget. Why
isn't this a model validation? Because that violates MVC. You can use it like this, or how ever you
like. Passing in the ActiveRecord object is optional, if you do--and the captcha fails to verify--an
error will be added to the object for you to use.

Some of the options available:

| Option       | Description |
|--------------|-------------|
| :model       | Model to set errors.
| :attribute   | Model attribute to receive errors. (default :base)
| :message     | Custom error message.
| :private_key | Override private API key.
| :timeout     | The number of seconds to wait for reCAPTCHA servers before give up. (default `3`)
| :response    | Custom response parameter. (default: params['g-recaptcha-response'])
| :hostname    | Expected hostname or a callable that validates the hostname, see [domain validation](https://developers.google.com/recaptcha/docs/domain_validation) and [hostname](https://developers.google.com/recaptcha/docs/verify#api-response) docs. (default: `nil`, but can be changed by setting `config.hostname`)

## I18n support
reCAPTCHA passes two types of error explanation to a linked model. It will use the I18n gem
to translate the default error message if I18n is available. To customize the messages to your locale,
add these keys to your I18n backend:

`recaptcha.errors.verification_failed` error message displayed if the captcha words didn't match
`recaptcha.errors.recaptcha_unreachable` displayed if a timeout error occured while attempting to verify the captcha

Also you can translate API response errors to human friendly by adding translations to the locale (`config/locales/en.yml`):

```Yaml
en:
  recaptcha:
    errors:
      incorrect-captcha-sol: 'Fail'
```

## Testing

By default, reCAPTCHA is skipped in "test" and "cucumber" env. To enable it during test:

```Ruby
Recaptcha.configuration.skip_verify_env.delete("test")
```

## Alternative API key setup

### Recaptcha.configure

```Ruby
# config/initializers/recaptcha.rb
Recaptcha.configure do |config|
  config.public_key  = '6Lc6BAAAAAAAAChqRbQZcn_yyyyyyyyyyyyyyyyy'
  config.private_key = '6Lc6BAAAAAAAAKN3DRm6VA_xxxxxxxxxxxxxxxxx'
  # Uncomment the following line if you are using a proxy server:
  # config.proxy = 'http://myproxy.com.au:8080'
end
```

### Recaptcha.with_configuration

For temporary overwrites (not thread safe).

```Ruby
Recaptcha.with_configuration(public_key: '12345') do
  # Do stuff with the overwritten public_key.
end
```

### Per call

Pass in keys as options at runtime, for code base with multiple reCAPTCHA setups:

```Ruby
recaptcha_tags public_key: '6Lc6BAAAAAAAAChqRbQZcn_yyyyyyyyyyyyyyyyy'

and

verify_recaptcha private_key: '6Lc6BAAAAAAAAKN3DRm6VA_xxxxxxxxxxxxxxxxx'
```

## Misc
 - Check out the [wiki](https://github.com/ambethia/recaptcha/wiki) and leave whatever you found valuable there.
 - [Add multiple widgets to the same page](https://github.com/ambethia/recaptcha/wiki/Add-multiple-widgets-to-the-same-page)
 - [Use Recaptcha with Devise](https://github.com/plataformatec/devise/wiki/How-To:-Use-Recaptcha-with-Devise)
