PhabricatorAuthProviderOAuthFacebook.php
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	<?php

	final class PhabricatorAuthProviderOAuthFacebook
	extends PhabricatorAuthProviderOAuth {

	public function getProviderName() {
	return pht('Facebook');
	}

	protected function newOAuthAdapter() {
	return new PhutilAuthAdapterOAuthFacebook();
	}

	protected function getLoginIcon() {
	return 'Facebook';
	}

	public function isEnabled() {
	return parent::isEnabled() &&
	PhabricatorEnv::getEnvConfig('facebook.auth-enabled');
	}

	protected function getOAuthClientID() {
	return PhabricatorEnv::getEnvConfig('facebook.application-id');
	}

	protected function getOAuthClientSecret() {
	$secret = PhabricatorEnv::getEnvConfig('facebook.application-secret');
	if ($secret) {
	return new PhutilOpaqueEnvelope($secret);
	}
	return null;
	}

	public function shouldAllowLogin() {
	return true;
	}

	public function shouldAllowRegistration() {
	return PhabricatorEnv::getEnvConfig('facebook.registration-enabled');
	}

	public function shouldAllowAccountLink() {
	return true;
	}

	public function shouldAllowAccountUnlink() {
	return !PhabricatorEnv::getEnvConfig('facebook.auth-permanent');
	}

	}