1 files changed, 292 insertions, 0 deletions
diff --git a/lib/facebook-graph-sdk/src/Facebook/Authentication/OAuth2Client.php b/lib/facebook-graph-sdk/src/Facebook/Authentication/OAuth2Client.php
new file mode 100644
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--- /dev/null
+++ b/lib/facebook-graph-sdk/src/Facebook/Authentication/OAuth2Client.php
@@ -0,0 +1,292 @@
+<?php
+/**
+ * Copyright 2014 Facebook, Inc.
+ *
+ * You are hereby granted a non-exclusive, worldwide, royalty-free license to
+ * use, copy, modify, and distribute this software in source code or binary
+ * form for use in connection with the web services and APIs provided by
+ * Facebook.
+ *
+ * As with any software that integrates with the Facebook platform, your use
+ * of this software is subject to the Facebook Developer Principles and
+ * Policies [http://developers.facebook.com/policy/]. This copyright notice
+ * shall be included in all copies or substantial portions of the software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ */
+namespace Facebook\Authentication;
+
+use Facebook\Facebook;
+use Facebook\FacebookApp;
+use Facebook\FacebookRequest;
+use Facebook\FacebookResponse;
+use Facebook\FacebookClient;
+use Facebook\Exceptions\FacebookResponseException;
+use Facebook\Exceptions\FacebookSDKException;
+
+/**
+ * Class OAuth2Client
+ *
+ * @package Facebook
+ */
+class OAuth2Client
+{
+    /**
+     * @const string The base authorization URL.
+     */
+    const BASE_AUTHORIZATION_URL = 'https://www.facebook.com';
+
+    /**
+     * The FacebookApp entity.
+     *
+     * @var FacebookApp
+     */
+    protected $app;
+
+    /**
+     * The Facebook client.
+     *
+     * @var FacebookClient
+     */
+    protected $client;
+
+    /**
+     * The version of the Graph API to use.
+     *
+     * @var string
+     */
+    protected $graphVersion;
+
+    /**
+     * The last request sent to Graph.
+     *
+     * @var FacebookRequest|null
+     */
+    protected $lastRequest;
+
+    /**
+     * @param FacebookApp    $app
+     * @param FacebookClient $client
+     * @param string|null    $graphVersion The version of the Graph API to use.
+     */
+    public function __construct(FacebookApp $app, FacebookClient $client, $graphVersion = null)
+    {
+        $this->app = $app;
+        $this->client = $client;
+        $this->graphVersion = $graphVersion ?: Facebook::DEFAULT_GRAPH_VERSION;
+    }
+
+    /**
+     * Returns the last FacebookRequest that was sent.
+     * Useful for debugging and testing.
+     *
+     * @return FacebookRequest|null
+     */
+    public function getLastRequest()
+    {
+        return $this->lastRequest;
+    }
+
+    /**
+     * Get the metadata associated with the access token.
+     *
+     * @param AccessToken|string $accessToken The access token to debug.
+     *
+     * @return AccessTokenMetadata
+     */
+    public function debugToken($accessToken)
+    {
+        $accessToken = $accessToken instanceof AccessToken ? $accessToken->getValue() : $accessToken;
+        $params = ['input_token' => $accessToken];
+
+        $this->lastRequest = new FacebookRequest(
+            $this->app,
+            $this->app->getAccessToken(),
+            'GET',
+            '/debug_token',
+            $params,
+            null,
+            $this->graphVersion
+        );
+        $response = $this->client->sendRequest($this->lastRequest);
+        $metadata = $response->getDecodedBody();
+
+        return new AccessTokenMetadata($metadata);
+    }
+
+    /**
+     * Generates an authorization URL to begin the process of authenticating a user.
+     *
+     * @param string $redirectUrl The callback URL to redirect to.
+     * @param array  $scope       An array of permissions to request.
+     * @param string $state       The CSPRNG-generated CSRF value.
+     * @param array  $params      An array of parameters to generate URL.
+     * @param string $separator   The separator to use in http_build_query().
+     *
+     * @return string
+     */
+    public function getAuthorizationUrl($redirectUrl, $state, array $scope = [], array $params = [], $separator = '&')
+    {
+        $params += [
+            'client_id' => $this->app->getId(),
+            'state' => $state,
+            'response_type' => 'code',
+            'sdk' => 'php-sdk-' . Facebook::VERSION,
+            'redirect_uri' => $redirectUrl,
+            'scope' => implode(',', $scope)
+        ];
+
+        return static::BASE_AUTHORIZATION_URL . '/' . $this->graphVersion . '/dialog/oauth?' . http_build_query($params, null, $separator);
+    }
+
+    /**
+     * Get a valid access token from a code.
+     *
+     * @param string $code
+     * @param string $redirectUri
+     *
+     * @return AccessToken
+     *
+     * @throws FacebookSDKException
+     */
+    public function getAccessTokenFromCode($code, $redirectUri = '')
+    {
+        $params = [
+            'code' => $code,
+            'redirect_uri' => $redirectUri,
+        ];
+
+        return $this->requestAnAccessToken($params);
+    }
+
+    /**
+     * Exchanges a short-lived access token with a long-lived access token.
+     *
+     * @param AccessToken|string $accessToken
+     *
+     * @return AccessToken
+     *
+     * @throws FacebookSDKException
+     */
+    public function getLongLivedAccessToken($accessToken)
+    {
+        $accessToken = $accessToken instanceof AccessToken ? $accessToken->getValue() : $accessToken;
+        $params = [
+            'grant_type' => 'fb_exchange_token',
+            'fb_exchange_token' => $accessToken,
+        ];
+
+        return $this->requestAnAccessToken($params);
+    }
+
+    /**
+     * Get a valid code from an access token.
+     *
+     * @param AccessToken|string $accessToken
+     * @param string             $redirectUri
+     *
+     * @return AccessToken
+     *
+     * @throws FacebookSDKException
+     */
+    public function getCodeFromLongLivedAccessToken($accessToken, $redirectUri = '')
+    {
+        $params = [
+            'redirect_uri' => $redirectUri,
+        ];
+
+        $response = $this->sendRequestWithClientParams('/oauth/client_code', $params, $accessToken);
+        $data = $response->getDecodedBody();
+
+        if (!isset($data['code'])) {
+            throw new FacebookSDKException('Code was not returned from Graph.', 401);
+        }
+
+        return $data['code'];
+    }
+
+    /**
+     * Send a request to the OAuth endpoint.
+     *
+     * @param array $params
+     *
+     * @return AccessToken
+     *
+     * @throws FacebookSDKException
+     */
+    protected function requestAnAccessToken(array $params)
+    {
+        $response = $this->sendRequestWithClientParams('/oauth/access_token', $params);
+        $data = $response->getDecodedBody();
+
+        if (!isset($data['access_token'])) {
+            throw new FacebookSDKException('Access token was not returned from Graph.', 401);
+        }
+
+        // Graph returns two different key names for expiration time
+        // on the same endpoint. Doh! :/
+        $expiresAt = 0;
+        if (isset($data['expires'])) {
+            // For exchanging a short lived token with a long lived token.
+            // The expiration time in seconds will be returned as "expires".
+            $expiresAt = time() + $data['expires'];
+        } elseif (isset($data['expires_in'])) {
+            // For exchanging a code for a short lived access token.
+            // The expiration time in seconds will be returned as "expires_in".
+            // See: https://developers.facebook.com/docs/facebook-login/access-tokens#long-via-code
+            $expiresAt = time() + $data['expires_in'];
+        }
+
+        return new AccessToken($data['access_token'], $expiresAt);
+    }
+
+    /**
+     * Send a request to Graph with an app access token.
+     *
+     * @param string      $endpoint
+     * @param array       $params
+     * @param string|null $accessToken
+     *
+     * @return FacebookResponse
+     *
+     * @throws FacebookResponseException
+     */
+    protected function sendRequestWithClientParams($endpoint, array $params, $accessToken = null)
+    {
+        $params += $this->getClientParams();
+
+        $accessToken = $accessToken ?: $this->app->getAccessToken();
+
+        $this->lastRequest = new FacebookRequest(
+            $this->app,
+            $accessToken,
+            'GET',
+            $endpoint,
+            $params,
+            null,
+            $this->graphVersion
+        );
+
+        return $this->client->sendRequest($this->lastRequest);
+    }
+
+    /**
+     * Returns the client_* params for OAuth requests.
+     *
+     * @return array
+     */
+    protected function getClientParams()
+    {
+        return [
+            'client_id' => $this->app->getId(),
+            'client_secret' => $this->app->getSecret(),
+        ];
+    }
+}