add Wechat support

src/OAuth/OAuth2/Service/Wechat.php

@@ -0,0 +1,142 @@
+<?php
+
+namespace OAuth\OAuth2\Service;
+
+use OAuth\OAuth2\Token\StdOAuth2Token;
+use OAuth\Common\Http\Exception\TokenResponseException;
+use OAuth\Common\Http\Uri\Uri;
+use OAuth\Common\Consumer\CredentialsInterface;
+use OAuth\Common\Http\Client\ClientInterface;
+use OAuth\Common\Storage\TokenStorageInterface;
+use OAuth\Common\Http\Uri\UriInterface;
+
+/**
+ * Wechat service.
+ *
+ * @author snaill <[email protected]>
+ * @link https://developers.weixin.qq.com/doc/offiaccount/OA_Web_Apps/Wechat_webpage_authorization.html
+ */
+class Wechat extends AbstractService
+{
+    const SCOPE_SNSAPI_BASE             = 'snsapi_base';
+    const SCOPE_SNSAPI_USERINFO         = 'snsapi_userinfo';
+
+    public function __construct(
+        CredentialsInterface $credentials,
+        ClientInterface $httpClient,
+        TokenStorageInterface $storage,
+        $scopes = array(),
+        UriInterface $baseApiUri = null
+    ) {
+        parent::__construct($credentials, $httpClient, $storage, $scopes, $baseApiUri);
+
+        if (null === $baseApiUri) {
+            $this->baseApiUri = new Uri('https://open.weixin.qq.com/connect/');
+        }
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getAuthorizationUri(array $additionalParameters = array())
+    {
+        $parameters = array_merge(
+            $additionalParameters,
+            array(
+                'appid'         => $this->credentials->getConsumerId(),
+                'redirect_uri'  => $this->credentials->getCallbackUrl(),
+                'response_type' => 'code',
+            )
+        );
+
+        $parameters['scope'] = implode(' ', $this->scopes);
+
+        // Build the url
+        $url = clone $this->getAuthorizationEndpoint();
+        foreach ($parameters as $key => $val) {
+            $url->addToQuery($key, $val);
+        }
+
+        return $url.'#wechat_redirect';
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getAuthorizationEndpoint()
+    {
+        return new Uri('https://open.weixin.qq.com/connect/oauth2/authorize');
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getAccessTokenEndpoint()
+    {
+        return new Uri('https://api.weixin.qq.com/sns/oauth2/access_token');
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function getAuthorizationMethod()
+    {
+        return static::AUTHORIZATION_METHOD_QUERY_STRING;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function requestAccessToken($code, $state = null)
+    {
+        if (null !== $state) {
+            $this->validateAuthorizationState($state);
+        }
+
+        $bodyParams = array(
+            'code'          => $code,
+            'appid'         => $this->credentials->getConsumerId(),
+            'secret'        => $this->credentials->getConsumerSecret(),
+            'grant_type'    => 'authorization_code',
+        );
+
+        $responseBody = $this->httpClient->retrieveResponse(
+            $this->getAccessTokenEndpoint(),
+            $bodyParams,
+            $this->getExtraOAuthHeaders()
+        );
+
+        $token = $this->parseAccessTokenResponse($responseBody);
+        $this->storage->storeAccessToken($this->service(), $token);
+
+        return $token;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function parseAccessTokenResponse($responseBody)
+    {
+        $data = json_decode($responseBody, true);
+
+        if (null === $data || !is_array($data)) {
+            throw new TokenResponseException('Unable to parse response.');
+        } elseif (isset($data['errmsg'])) {
+            throw new TokenResponseException('Error in retrieving token: "' . $data['error'] . '"');
+        }
+
+        $token = new StdOAuth2Token();
+        $token->setAccessToken($data['access_token']);
+
+        if (isset($data['refresh_token'])) {
+            $token->setRefreshToken($data['refresh_token']);
+            unset($data['refresh_token']);
+        }
+
+        unset($data['access_token']);
+
+        $token->setExtraParams($data);
+
+        return $token;
+    }
+}