"\yii\authclient\provider\Collection" added.

extensions/yii/authclient/provider/Collection.php

+<?php
+/**
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright (c) 2008 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+namespace yii\authclient\provider;
+
+use yii\base\Component;
+use yii\base\InvalidParamException;
+use Yii;
+
+/**
+ * Collection is a storage for all auth providers in the application.
+ *
+ * Example application configuration:
+ *
+ * ~~~
+ * 'components' => [
+ *     'auth' => [
+ *         'class' => 'yii\authclient\provider\Collection',
+ *         'providers' => [
+ *             'google' => [
+ *                 'class' => 'yii\authclient\provider\GoogleOpenId'
+ *             ],
+ *             'facebook' => [
+ *                 'class' => 'yii\authclient\provider\Facebook',
+ *                 'clientId' => 'facebook_client_id',
+ *                 'clientSecret' => 'facebook_client_secret',
+ *             ],
+ *         ],
+ *     ]
+ *     ...
+ * ]
+ * ~~~
+ *
+ * @author Paul Klimov <klimov.paul@gmail.com>
+ * @since 2.0
+ */
+class Collection extends Component
+{
+	/**
+	 * @var array list of Auth providers with their configuration in format: 'providerId' => [...]
+	 */
+	private $_providers = [];
+
+	/**
+	 * @param array $providers list of auth providers
+	 */
+	public function setProviders(array $providers)
+	{
+		$this->_providers = $providers;
+	}
+
+	/**
+	 * @return ProviderInterface[] list of auth providers.
+	 */
+	public function getProviders()
+	{
+		$providers = [];
+		foreach ($this->_providers as $id => $provider) {
+			$providers[$id] = $this->getProvider($id);
+		}
+		return $providers;
+	}
+
+	/**
+	 * @param string $id service id.
+	 * @return ProviderInterface auth service instance.
+	 * @throws InvalidParamException on non existing provider request.
+	 */
+	public function getProvider($id)
+	{
+		if (!array_key_exists($id, $this->_providers)) {
+			throw new InvalidParamException("Unknown auth provider '{$id}'.");
+		}
+		if (!is_object($this->_providers[$id])) {
+			$this->_providers[$id] = $this->createProvider($id, $this->_providers[$id]);
+		}
+		return $this->_providers[$id];
+	}
+
+	/**
+	 * Checks if provider exists in the hub.
+	 * @param string $id provider id.
+	 * @return boolean whether provider exist.
+	 */
+	public function hasProvider($id)
+	{
+		return array_key_exists($id, $this->_providers);
+	}
+
+	/**
+	 * Creates auth provider instance from its array configuration.
+	 * @param string $id auth provider id.
+	 * @param array $config auth provider instance configuration.
+	 * @return ProviderInterface auth provider instance.
+	 */
+	protected function createProvider($id, array $config)
+	{
+		$config['id'] = $id;
+		return Yii::createObject($config);
+	}
+}
\ No newline at end of file

tests/unit/extensions/authclient/provider/CollectionTest.php

+<?php
+
+namespace yiiunit\extensions\authclient\provider;
+
+use yii\authclient\provider\Collection;
+use yii\authclient\provider\ProviderInterface;
+use yii\authclient\provider\ProviderTrait;
+use yii\base\Object;
+use yiiunit\extensions\authclient\TestCase;
+
+class CollectionTest extends TestCase
+{
+	// Tests :
+
+	public function testSetGet()
+	{
+		$collection = new Collection();
+
+		$providers = [
+			'testProvider1' => new TestProvider(),
+			'testProvider2' => new TestProvider(),
+		];
+		$collection->setProviders($providers);
+		$this->assertEquals($providers, $collection->getProviders(), 'Unable to setup providers!');
+	}
+
+	/**
+	 * @depends testSetGet
+	 */
+	public function testGetProviderById()
+	{
+		$collection = new Collection();
+
+		$providerId = 'testProviderId';
+		$provider = new TestProvider();
+		$providers = [
+			$providerId => $provider
+		];
+		$collection->setProviders($providers);
+
+		$this->assertEquals($provider, $collection->getProvider($providerId), 'Unable to get provider by id!');
+	}
+
+	/**
+	 * @depends testGetProviderById
+	 */
+	public function testCreateProvider()
+	{
+		$collection = new Collection();
+
+		$providerId = 'testProviderId';
+		$providerClassName = TestProvider::className();
+		$providers = [
+			$providerId => [
+				'class' => $providerClassName
+			]
+		];
+		$collection->setProviders($providers);
+
+		$provider = $collection->getProvider($providerId);
+		$this->assertTrue(is_object($provider), 'Unable to create provider by config!');
+		$this->assertTrue(is_a($provider, $providerClassName), 'Provider has wrong class name!');
+	}
+
+	/**
+	 * @depends testSetGet
+	 */
+	public function testHasProvider()
+	{
+		$collection = new Collection();
+
+		$providerName = 'testProviderName';
+		$providers = [
+			$providerName => [
+				'class' => 'TestProvider1'
+			],
+		];
+		$collection->setProviders($providers);
+
+		$this->assertTrue($collection->hasProvider($providerName), 'Existing provider check fails!');
+		$this->assertFalse($collection->hasProvider('unExistingProviderName'), 'Not existing provider check fails!');
+	}
+}
+
+class TestProvider extends Object implements ProviderInterface
+{
+	use ProviderTrait;
+
+	public function authenticate() {}
+}
\ No newline at end of file