# SpamProtection Module

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## Maintainer Contact

 * Saophalkun Ponlu
   <phalkunz (at) silverstripe (dot) com>

 * Will Rossiter
   <will (at) fullscreen (dot) io>

## Requirements

SilverStripe 3.0.0 or greater

## Documentation

This module provides a generic, consistent API for adding spam protection to
your SilverStripe Forms. This does not provide any spam protection out of the
box, for that, you must also download one of the spam protection
implementations. Currently available options are:

* [Mollom](https://github.com/silverstripe/silverstripe-mollom)
* [Recaptcha](https://github.com/chillu/silverstripe-recaptcha)
* [MathSpamProtection](https://github.com/silverstripe/silverstripe-mathspamprotection)
* [Akismet](https://github.com/tractorcow/silverstripe-akismet)

As a developer you can also provide your own protector by creating a class which
implements the `SpamProtector` interface. More on that below.

## Configuring

After installing this module and a protector of your choice (i.e mollom) you'll
need to rebuild your database through `dev/build` and set the default protector
via SilverStripe's config system. This will update any Form instances that have
spam protection hooks with that protector.

*mysite/_config/spamprotection.yml*

	---
	name: spamprotection
	---
	FormSpamProtectionExtension:
	  default_spam_protector: MollomSpamProtector

To add spam protection to your form instance call `enableSpamProtection`.

	// your existing form code
	$form = new Form( .. );
	$form->enableSpamProtection();

The logic to perform the actual spam validation is controlled by each of the
individual `SpamProtector` implementation since they each require a different
implementation client side or server side.

### Options

`enableSpamProtection` takes a hash of optional configuration values.

	$form->enableSpamProtection(array(
		'protector' => 'MathSpamProtector',
		'name' => 'Captcha'
	));

Options to configure are:

*`protector`* a class name string or class instance which implements
`SpamProtector`. Defaults to your
`FormSpamProtectionExtension.default_spam_protector` value.

*`name`* the form field name argument for the Captcha. Defaults to `Catcha`.
*`title`* title of the Captcha form field. Defaults to `''`
*`insertBefore`* name of existing field to insert the spam protection field prior to
*`mapping`* an array mapping of the Form fields to the standardized list of
field names. The list of standardized fields to pass to the spam protector are:

		title
		body
		contextUrl
		contextTitle
		authorName
		authorMail
		authorUrl
		authorIp
		authorId

## Defining your own `SpamProtector`

Any class that implements `SpamProtector` and the `getFormField()` method can
be set as the spam protector. The `getFormField()` method returns the
`FormField` to be inserted into the `Form`. The `FormField` returned should be
in charge of the validation process.

	<?php

	class CustomSpamProtector implements SpamProtector {

		public function getFormField($name = null, $title = null, $value = null) {
			// CaptchaField is a imagined class which has some functionality.
			// See silverstripe-mollom module for an example.
			return new CaptchaField($name, $title, $value);
		}
	}


## Using Spam Protection with User Forms

This module provides an EditableSpamProtectionField wrapper which you can add
to your UserForm instances. After installing this module and running /dev/build
to rebuild the database, your Form Builder interface will have an option for
`Spam Protection Field`. The type of spam protection used will be based on your
currently selected SpamProtector instance.

## Releasing code with Spam Protection support

Spam protection is useful to provide but in some cases we do not want to require
the developer to use spam protection. In that case, modules can provide the
following pattern

	$form = new Form(..);

	if($form->hasExtension('FormSpamProtectionExtension')) {
		$form->enableSpamProtection();
	}