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Facebook/Authentication/AccessToken.php

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+<?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;
+
+/**
+ * Class AccessToken
+ *
+ * @package Facebook
+ */
+class AccessToken
+{
+    /**
+     * The access token value.
+     *
+     * @var string
+     */
+    protected $value = '';
+
+    /**
+     * Date when token expires.
+     *
+     * @var \DateTime|null
+     */
+    protected $expiresAt;
+
+    /**
+     * Create a new access token entity.
+     *
+     * @param string $accessToken
+     * @param int    $expiresAt
+     */
+    public function __construct($accessToken, $expiresAt = 0)
+    {
+        $this->value = $accessToken;
+        if ($expiresAt) {
+            $this->setExpiresAtFromTimeStamp($expiresAt);
+        }
+    }
+
+    /**
+     * Generate an app secret proof to sign a request to Graph.
+     *
+     * @param string $appSecret The app secret.
+     *
+     * @return string
+     */
+    public function getAppSecretProof($appSecret)
+    {
+        return hash_hmac('sha256', $this->value, $appSecret);
+    }
+
+    /**
+     * Getter for expiresAt.
+     *
+     * @return \DateTime|null
+     */
+    public function getExpiresAt()
+    {
+        return $this->expiresAt;
+    }
+
+    /**
+     * Determines whether or not this is an app access token.
+     *
+     * @return bool
+     */
+    public function isAppAccessToken()
+    {
+        return strpos($this->value, '|') !== false;
+    }
+
+    /**
+     * Determines whether or not this is a long-lived token.
+     *
+     * @return bool
+     */
+    public function isLongLived()
+    {
+        if ($this->expiresAt) {
+            return $this->expiresAt->getTimestamp() > time() + (60 * 60 * 2);
+        }
+
+        if ($this->isAppAccessToken()) {
+            return true;
+        }
+
+        return false;
+    }
+
+    /**
+     * Checks the expiration of the access token.
+     *
+     * @return boolean|null
+     */
+    public function isExpired()
+    {
+        if ($this->getExpiresAt() instanceof \DateTime) {
+            return $this->getExpiresAt()->getTimestamp() < time();
+        }
+
+        if ($this->isAppAccessToken()) {
+            return false;
+        }
+
+        return null;
+    }
+
+    /**
+     * Returns the access token as a string.
+     *
+     * @return string
+     */
+    public function getValue()
+    {
+        return $this->value;
+    }
+
+    /**
+     * Returns the access token as a string.
+     *
+     * @return string
+     */
+    public function __toString()
+    {
+        return $this->getValue();
+    }
+
+    /**
+     * Setter for expires_at.
+     *
+     * @param int $timeStamp
+     */
+    protected function setExpiresAtFromTimeStamp($timeStamp)
+    {
+        $dt = new \DateTime();
+        $dt->setTimestamp($timeStamp);
+        $this->expiresAt = $dt;
+    }
+}

Facebook/Authentication/AccessTokenMetadata.php

@@ -0,0 +1,390 @@
+<?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\Exceptions\FacebookSDKException;
+
+/**
+ * Class AccessTokenMetadata
+ *
+ * Represents metadata from an access token.
+ *
+ * @package Facebook
+ * @see     https://developers.facebook.com/docs/graph-api/reference/debug_token
+ */
+class AccessTokenMetadata
+{
+    /**
+     * The access token metadata.
+     *
+     * @var array
+     */
+    protected $metadata = [];
+
+    /**
+     * Properties that should be cast as DateTime objects.
+     *
+     * @var array
+     */
+    protected static $dateProperties = ['expires_at', 'issued_at'];
+
+    /**
+     * @param array $metadata
+     *
+     * @throws FacebookSDKException
+     */
+    public function __construct(array $metadata)
+    {
+        if (!isset($metadata['data'])) {
+            throw new FacebookSDKException('Unexpected debug token response data.', 401);
+        }
+
+        $this->metadata = $metadata['data'];
+
+        $this->castTimestampsToDateTime();
+    }
+
+    /**
+     * Returns a value from the metadata.
+     *
+     * @param string $field   The property to retrieve.
+     * @param mixed  $default The default to return if the property doesn't exist.
+     *
+     * @return mixed
+     */
+    public function getField($field, $default = null)
+    {
+        if (isset($this->metadata[$field])) {
+            return $this->metadata[$field];
+        }
+
+        return $default;
+    }
+
+    /**
+     * Returns a value from the metadata.
+     *
+     * @param string $field   The property to retrieve.
+     * @param mixed  $default The default to return if the property doesn't exist.
+     *
+     * @return mixed
+     *
+     * @deprecated 5.0.0 getProperty() has been renamed to getField()
+     * @todo v6: Remove this method
+     */
+    public function getProperty($field, $default = null)
+    {
+        return $this->getField($field, $default);
+    }
+
+    /**
+     * Returns a value from a child property in the metadata.
+     *
+     * @param string $parentField The parent property.
+     * @param string $field       The property to retrieve.
+     * @param mixed  $default     The default to return if the property doesn't exist.
+     *
+     * @return mixed
+     */
+    public function getChildProperty($parentField, $field, $default = null)
+    {
+        if (!isset($this->metadata[$parentField])) {
+            return $default;
+        }
+
+        if (!isset($this->metadata[$parentField][$field])) {
+            return $default;
+        }
+
+        return $this->metadata[$parentField][$field];
+    }
+
+    /**
+     * Returns a value from the error metadata.
+     *
+     * @param string $field   The property to retrieve.
+     * @param mixed  $default The default to return if the property doesn't exist.
+     *
+     * @return mixed
+     */
+    public function getErrorProperty($field, $default = null)
+    {
+        return $this->getChildProperty('error', $field, $default);
+    }
+
+    /**
+     * Returns a value from the "metadata" metadata. *Brain explodes*
+     *
+     * @param string $field   The property to retrieve.
+     * @param mixed  $default The default to return if the property doesn't exist.
+     *
+     * @return mixed
+     */
+    public function getMetadataProperty($field, $default = null)
+    {
+        return $this->getChildProperty('metadata', $field, $default);
+    }
+
+    /**
+     * The ID of the application this access token is for.
+     *
+     * @return string|null
+     */
+    public function getAppId()
+    {
+        return $this->getField('app_id');
+    }
+
+    /**
+     * Name of the application this access token is for.
+     *
+     * @return string|null
+     */
+    public function getApplication()
+    {
+        return $this->getField('application');
+    }
+
+    /**
+     * Any error that a request to the graph api
+     * would return due to the access token.
+     *
+     * @return bool|null
+     */
+    public function isError()
+    {
+        return $this->getField('error') !== null;
+    }
+
+    /**
+     * The error code for the error.
+     *
+     * @return int|null
+     */
+    public function getErrorCode()
+    {
+        return $this->getErrorProperty('code');
+    }
+
+    /**
+     * The error message for the error.
+     *
+     * @return string|null
+     */
+    public function getErrorMessage()
+    {
+        return $this->getErrorProperty('message');
+    }
+
+    /**
+     * The error subcode for the error.
+     *
+     * @return int|null
+     */
+    public function getErrorSubcode()
+    {
+        return $this->getErrorProperty('subcode');
+    }
+
+    /**
+     * DateTime when this access token expires.
+     *
+     * @return \DateTime|null
+     */
+    public function getExpiresAt()
+    {
+        return $this->getField('expires_at');
+    }
+
+    /**
+     * Whether the access token is still valid or not.
+     *
+     * @return boolean|null
+     */
+    public function getIsValid()
+    {
+        return $this->getField('is_valid');
+    }
+
+    /**
+     * DateTime when this access token was issued.
+     *
+     * Note that the issued_at field is not returned
+     * for short-lived access tokens.
+     *
+     * @see https://developers.facebook.com/docs/facebook-login/access-tokens#debug
+     *
+     * @return \DateTime|null
+     */
+    public function getIssuedAt()
+    {
+        return $this->getField('issued_at');
+    }
+
+    /**
+     * General metadata associated with the access token.
+     * Can contain data like 'sso', 'auth_type', 'auth_nonce'.
+     *
+     * @return array|null
+     */
+    public function getMetadata()
+    {
+        return $this->getField('metadata');
+    }
+
+    /**
+     * The 'sso' child property from the 'metadata' parent property.
+     *
+     * @return string|null
+     */
+    public function getSso()
+    {
+        return $this->getMetadataProperty('sso');
+    }
+
+    /**
+     * The 'auth_type' child property from the 'metadata' parent property.
+     *
+     * @return string|null
+     */
+    public function getAuthType()
+    {
+        return $this->getMetadataProperty('auth_type');
+    }
+
+    /**
+     * The 'auth_nonce' child property from the 'metadata' parent property.
+     *
+     * @return string|null
+     */
+    public function getAuthNonce()
+    {
+        return $this->getMetadataProperty('auth_nonce');
+    }
+
+    /**
+     * For impersonated access tokens, the ID of
+     * the page this token contains.
+     *
+     * @return string|null
+     */
+    public function getProfileId()
+    {
+        return $this->getField('profile_id');
+    }
+
+    /**
+     * List of permissions that the user has granted for
+     * the app in this access token.
+     *
+     * @return array
+     */
+    public function getScopes()
+    {
+        return $this->getField('scopes');
+    }
+
+    /**
+     * The ID of the user this access token is for.
+     *
+     * @return string|null
+     */
+    public function getUserId()
+    {
+        return $this->getField('user_id');
+    }
+
+    /**
+     * Ensures the app ID from the access token
+     * metadata is what we expect.
+     *
+     * @param string $appId
+     *
+     * @throws FacebookSDKException
+     */
+    public function validateAppId($appId)
+    {
+        if ($this->getAppId() !== $appId) {
+            throw new FacebookSDKException('Access token metadata contains unexpected app ID.', 401);
+        }
+    }
+
+    /**
+     * Ensures the user ID from the access token
+     * metadata is what we expect.
+     *
+     * @param string $userId
+     *
+     * @throws FacebookSDKException
+     */
+    public function validateUserId($userId)
+    {
+        if ($this->getUserId() !== $userId) {
+            throw new FacebookSDKException('Access token metadata contains unexpected user ID.', 401);
+        }
+    }
+
+    /**
+     * Ensures the access token has not expired yet.
+     *
+     * @throws FacebookSDKException
+     */
+    public function validateExpiration()
+    {
+        if (!$this->getExpiresAt() instanceof \DateTime) {
+            return;
+        }
+
+        if ($this->getExpiresAt()->getTimestamp() < time()) {
+            throw new FacebookSDKException('Inspection of access token metadata shows that the access token has expired.', 401);
+        }
+    }
+
+    /**
+     * Converts a unix timestamp into a DateTime entity.
+     *
+     * @param int $timestamp
+     *
+     * @return \DateTime
+     */
+    private function convertTimestampToDateTime($timestamp)
+    {
+        $dt = new \DateTime();
+        $dt->setTimestamp($timestamp);
+
+        return $dt;
+    }
+
+    /**
+     * Casts the unix timestamps as DateTime entities.
+     */
+    private function castTimestampsToDateTime()
+    {
+        foreach (static::$dateProperties as $key) {
+            if (isset($this->metadata[$key])) {
+                $this->metadata[$key] = $this->convertTimestampToDateTime($this->metadata[$key]);
+            }
+        }
+    }
+}

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(),
+        ];
+    }
+}

Facebook/Exceptions/FacebookAuthenticationException.php

@@ -0,0 +1,33 @@
+<?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\Exceptions;
+
+/**
+ * Class FacebookAuthenticationException
+ *
+ * @package Facebook
+ */
+class FacebookAuthenticationException extends FacebookSDKException
+{
+}

Facebook/Exceptions/FacebookAuthorizationException.php

@@ -0,0 +1,33 @@
+<?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\Exceptions;
+
+/**
+ * Class FacebookAuthorizationException
+ *
+ * @package Facebook
+ */
+class FacebookAuthorizationException extends FacebookSDKException
+{
+}

Facebook/Exceptions/FacebookClientException.php

@@ -0,0 +1,33 @@
+<?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\Exceptions;
+
+/**
+ * Class FacebookClientException
+ *
+ * @package Facebook
+ */
+class FacebookClientException extends FacebookSDKException
+{
+}

Facebook/Exceptions/FacebookOtherException.php

@@ -0,0 +1,33 @@
+<?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\Exceptions;
+
+/**
+ * Class FacebookOtherException
+ *
+ * @package Facebook
+ */
+class FacebookOtherException extends FacebookSDKException
+{
+}

Facebook/Exceptions/FacebookResponseException.php

@@ -0,0 +1,208 @@
+<?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\Exceptions;
+
+use Facebook\FacebookResponse;
+
+/**
+ * Class FacebookResponseException
+ *
+ * @package Facebook
+ */
+class FacebookResponseException extends FacebookSDKException
+{
+    /**
+     * @var FacebookResponse The response that threw the exception.
+     */
+    protected $response;
+
+    /**
+     * @var array Decoded response.
+     */
+    protected $responseData;
+
+    /**
+     * Creates a FacebookResponseException.
+     *
+     * @param FacebookResponse     $response          The response that threw the exception.
+     * @param FacebookSDKException $previousException The more detailed exception.
+     */
+    public function __construct(FacebookResponse $response, FacebookSDKException $previousException = null)
+    {
+        $this->response = $response;
+        $this->responseData = $response->getDecodedBody();
+
+        $errorMessage = $this->get('message', 'Unknown error from Graph.');
+        $errorCode = $this->get('code', -1);
+
+        parent::__construct($errorMessage, $errorCode, $previousException);
+    }
+
+    /**
+     * A factory for creating the appropriate exception based on the response from Graph.
+     *
+     * @param FacebookResponse $response The response that threw the exception.
+     *
+     * @return FacebookResponseException
+     */
+    public static function create(FacebookResponse $response)
+    {
+        $data = $response->getDecodedBody();
+
+        if (!isset($data['error']['code']) && isset($data['code'])) {
+            $data = ['error' => $data];
+        }
+
+        $code = isset($data['error']['code']) ? $data['error']['code'] : null;
+        $message = isset($data['error']['message']) ? $data['error']['message'] : 'Unknown error from Graph.';
+
+        $previousException = null;
+
+        if (isset($data['error']['error_subcode'])) {
+            switch ($data['error']['error_subcode']) {
+                // Other authentication issues
+                case 458:
+                case 459:
+                case 460:
+                case 463:
+                case 464:
+                case 467:
+                    return new static($response, new FacebookAuthenticationException($message, $code));
+            }
+        }
+
+        switch ($code) {
+            // Login status or token expired, revoked, or invalid
+            case 100:
+            case 102:
+            case 190:
+                return new static($response, new FacebookAuthenticationException($message, $code));
+
+            // Server issue, possible downtime
+            case 1:
+            case 2:
+                return new static($response, new FacebookServerException($message, $code));
+
+            // API Throttling
+            case 4:
+            case 17:
+            case 341:
+                return new static($response, new FacebookThrottleException($message, $code));
+
+            // Duplicate Post
+            case 506:
+                return new static($response, new FacebookClientException($message, $code));
+        }
+
+        // Missing Permissions
+        if ($code == 10 || ($code >= 200 && $code <= 299)) {
+            return new static($response, new FacebookAuthorizationException($message, $code));
+        }
+
+        // OAuth authentication error
+        if (isset($data['error']['type']) && $data['error']['type'] === 'OAuthException') {
+            return new static($response, new FacebookAuthenticationException($message, $code));
+        }
+
+        // All others
+        return new static($response, new FacebookOtherException($message, $code));
+    }
+
+    /**
+     * Checks isset and returns that or a default value.
+     *
+     * @param string $key
+     * @param mixed  $default
+     *
+     * @return mixed
+     */
+    private function get($key, $default = null)
+    {
+        if (isset($this->responseData['error'][$key])) {
+            return $this->responseData['error'][$key];
+        }
+
+        return $default;
+    }
+
+    /**
+     * Returns the HTTP status code
+     *
+     * @return int
+     */
+    public function getHttpStatusCode()
+    {
+        return $this->response->getHttpStatusCode();
+    }
+
+    /**
+     * Returns the sub-error code
+     *
+     * @return int
+     */
+    public function getSubErrorCode()
+    {
+        return $this->get('error_subcode', -1);
+    }
+
+    /**
+     * Returns the error type
+     *
+     * @return string
+     */
+    public function getErrorType()
+    {
+        return $this->get('type', '');
+    }
+
+    /**
+     * Returns the raw response used to create the exception.
+     *
+     * @return string
+     */
+    public function getRawResponse()
+    {
+        return $this->response->getBody();
+    }
+
+    /**
+     * Returns the decoded response used to create the exception.
+     *
+     * @return array
+     */
+    public function getResponseData()
+    {
+        return $this->responseData;
+    }
+
+    /**
+     * Returns the response entity used to create the exception.
+     *
+     * @return FacebookResponse
+     */
+    public function getResponse()
+    {
+        return $this->response;
+    }
+}

Facebook/Exceptions/FacebookSDKException.php

@@ -0,0 +1,33 @@
+<?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\Exceptions;
+
+/**
+ * Class FacebookSDKException
+ *
+ * @package Facebook
+ */
+class FacebookSDKException extends \Exception
+{
+}

Facebook/Exceptions/FacebookServerException.php

@@ -0,0 +1,33 @@
+<?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\Exceptions;
+
+/**
+ * Class FacebookServerException
+ *
+ * @package Facebook
+ */
+class FacebookServerException extends FacebookSDKException
+{
+}

Facebook/Exceptions/FacebookThrottleException.php

@@ -0,0 +1,33 @@
+<?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\Exceptions;
+
+/**
+ * Class FacebookThrottleException
+ *
+ * @package Facebook
+ */
+class FacebookThrottleException extends FacebookSDKException
+{
+}

Facebook/Facebook.php

@@ -0,0 +1,589 @@
+<?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;
+
+use Facebook\Authentication\AccessToken;
+use Facebook\Authentication\OAuth2Client;
+use Facebook\FileUpload\FacebookFile;
+use Facebook\FileUpload\FacebookVideo;
+use Facebook\GraphNodes\GraphEdge;
+use Facebook\Url\UrlDetectionInterface;
+use Facebook\Url\FacebookUrlDetectionHandler;
+use Facebook\PseudoRandomString\PseudoRandomStringGeneratorInterface;
+use Facebook\PseudoRandomString\McryptPseudoRandomStringGenerator;
+use Facebook\PseudoRandomString\OpenSslPseudoRandomStringGenerator;
+use Facebook\PseudoRandomString\UrandomPseudoRandomStringGenerator;
+use Facebook\HttpClients\FacebookHttpClientInterface;
+use Facebook\HttpClients\FacebookCurlHttpClient;
+use Facebook\HttpClients\FacebookStreamHttpClient;
+use Facebook\HttpClients\FacebookGuzzleHttpClient;
+use Facebook\PersistentData\PersistentDataInterface;
+use Facebook\PersistentData\FacebookSessionPersistentDataHandler;
+use Facebook\PersistentData\FacebookMemoryPersistentDataHandler;
+use Facebook\Helpers\FacebookCanvasHelper;
+use Facebook\Helpers\FacebookJavaScriptHelper;
+use Facebook\Helpers\FacebookPageTabHelper;
+use Facebook\Helpers\FacebookRedirectLoginHelper;
+use Facebook\Exceptions\FacebookSDKException;
+
+/**
+ * Class Facebook
+ *
+ * @package Facebook
+ */
+class Facebook
+{
+    /**
+     * @const string Version number of the Facebook PHP SDK.
+     */
+    const VERSION = '5.0.0';
+
+    /**
+     * @const string Default Graph API version for requests.
+     */
+    const DEFAULT_GRAPH_VERSION = 'v2.4';
+
+    /**
+     * @const string The name of the environment variable that contains the app ID.
+     */
+    const APP_ID_ENV_NAME = 'FACEBOOK_APP_ID';
+
+    /**
+     * @const string The name of the environment variable that contains the app secret.
+     */
+    const APP_SECRET_ENV_NAME = 'FACEBOOK_APP_SECRET';
+
+    /**
+     * @var FacebookApp The FacebookApp entity.
+     */
+    protected $app;
+
+    /**
+     * @var FacebookClient The Facebook client service.
+     */
+    protected $client;
+
+    /**
+     * @var OAuth2Client The OAuth 2.0 client service.
+     */
+    protected $oAuth2Client;
+
+    /**
+     * @var UrlDetectionInterface|null The URL detection handler.
+     */
+    protected $urlDetectionHandler;
+
+    /**
+     * @var PseudoRandomStringGeneratorInterface|null The cryptographically secure pseudo-random string generator.
+     */
+    protected $pseudoRandomStringGenerator;
+
+    /**
+     * @var AccessToken|null The default access token to use with requests.
+     */
+    protected $defaultAccessToken;
+
+    /**
+     * @var string|null The default Graph version we want to use.
+     */
+    protected $defaultGraphVersion;
+
+    /**
+     * @var PersistentDataInterface|null The persistent data handler.
+     */
+    protected $persistentDataHandler;
+
+    /**
+     * @var FacebookResponse|FacebookBatchResponse|null Stores the last request made to Graph.
+     */
+    protected $lastResponse;
+
+    /**
+     * Instantiates a new Facebook super-class object.
+     *
+     * @param array $config
+     *
+     * @throws FacebookSDKException
+     */
+    public function __construct(array $config = [])
+    {
+        $appId = isset($config['app_id']) ? $config['app_id'] : getenv(static::APP_ID_ENV_NAME);
+        if (!$appId) {
+            throw new FacebookSDKException('Required "app_id" key not supplied in config and could not find fallback environment variable "' . static::APP_ID_ENV_NAME . '"');
+        }
+
+        $appSecret = isset($config['app_secret']) ? $config['app_secret'] : getenv(static::APP_SECRET_ENV_NAME);
+        if (!$appSecret) {
+            throw new FacebookSDKException('Required "app_secret" key not supplied in config and could not find fallback environment variable "' . static::APP_SECRET_ENV_NAME . '"');
+        }
+
+        $this->app = new FacebookApp($appId, $appSecret);
+
+        $httpClientHandler = null;
+        if (isset($config['http_client_handler'])) {
+            if ($config['http_client_handler'] instanceof FacebookHttpClientInterface) {
+                $httpClientHandler = $config['http_client_handler'];
+            } elseif ($config['http_client_handler'] === 'curl') {
+                $httpClientHandler = new FacebookCurlHttpClient();
+            } elseif ($config['http_client_handler'] === 'stream') {
+                $httpClientHandler = new FacebookStreamHttpClient();
+            } elseif ($config['http_client_handler'] === 'guzzle') {
+                $httpClientHandler = new FacebookGuzzleHttpClient();
+            } else {
+                throw new \InvalidArgumentException('The http_client_handler must be set to "curl", "stream", "guzzle", or be an instance of Facebook\HttpClients\FacebookHttpClientInterface');
+            }
+        }
+
+        $enableBeta = isset($config['enable_beta_mode']) && $config['enable_beta_mode'] === true;
+        $this->client = new FacebookClient($httpClientHandler, $enableBeta);
+
+        if (isset($config['url_detection_handler'])) {
+            if ($config['url_detection_handler'] instanceof UrlDetectionInterface) {
+                $this->urlDetectionHandler = $config['url_detection_handler'];
+            } else {
+                throw new \InvalidArgumentException('The url_detection_handler must be an instance of Facebook\Url\UrlDetectionInterface');
+            }
+        }
+
+        if (isset($config['pseudo_random_string_generator'])) {
+            if ($config['pseudo_random_string_generator'] instanceof PseudoRandomStringGeneratorInterface) {
+                $this->pseudoRandomStringGenerator = $config['pseudo_random_string_generator'];
+            } elseif ($config['pseudo_random_string_generator'] === 'mcrypt') {
+                $this->pseudoRandomStringGenerator = new McryptPseudoRandomStringGenerator();
+            } elseif ($config['pseudo_random_string_generator'] === 'openssl') {
+                $this->pseudoRandomStringGenerator = new OpenSslPseudoRandomStringGenerator();
+            } elseif ($config['pseudo_random_string_generator'] === 'urandom') {
+                $this->pseudoRandomStringGenerator = new UrandomPseudoRandomStringGenerator();
+            } else {
+                throw new \InvalidArgumentException('The pseudo_random_string_generator must be set to "mcrypt", "openssl", or "urandom", or be an instance of Facebook\PseudoRandomString\PseudoRandomStringGeneratorInterface');
+            }
+        }
+
+        if (isset($config['persistent_data_handler'])) {
+            if ($config['persistent_data_handler'] instanceof PersistentDataInterface) {
+                $this->persistentDataHandler = $config['persistent_data_handler'];
+            } elseif ($config['persistent_data_handler'] === 'session') {
+                $this->persistentDataHandler = new FacebookSessionPersistentDataHandler();
+            } elseif ($config['persistent_data_handler'] === 'memory') {
+                $this->persistentDataHandler = new FacebookMemoryPersistentDataHandler();
+            } else {
+                throw new \InvalidArgumentException('The persistent_data_handler must be set to "session", "memory", or be an instance of Facebook\PersistentData\PersistentDataInterface');
+            }
+        }
+
+        if (isset($config['default_access_token'])) {
+            $this->setDefaultAccessToken($config['default_access_token']);
+        }
+
+        if (isset($config['default_graph_version'])) {
+            $this->defaultGraphVersion = $config['default_graph_version'];
+        } else {
+            // @todo v6: Throw an InvalidArgumentException if "default_graph_version" is not set
+            $this->defaultGraphVersion = static::DEFAULT_GRAPH_VERSION;
+        }
+    }
+
+    /**
+     * Returns the FacebookApp entity.
+     *
+     * @return FacebookApp
+     */
+    public function getApp()
+    {
+        return $this->app;
+    }
+
+    /**
+     * Returns the FacebookClient service.
+     *
+     * @return FacebookClient
+     */
+    public function getClient()
+    {
+        return $this->client;
+    }
+
+    /**
+     * Returns the OAuth 2.0 client service.
+     *
+     * @return OAuth2Client
+     */
+    public function getOAuth2Client()
+    {
+        if (!$this->oAuth2Client instanceof OAuth2Client) {
+            $app = $this->getApp();
+            $client = $this->getClient();
+            $this->oAuth2Client = new OAuth2Client($app, $client, $this->defaultGraphVersion);
+        }
+
+        return $this->oAuth2Client;
+    }
+
+    /**
+     * Returns the last response returned from Graph.
+     *
+     * @return FacebookResponse|FacebookBatchResponse|null
+     */
+    public function getLastResponse()
+    {
+        return $this->lastResponse;
+    }
+
+    /**
+     * Returns the URL detection handler.
+     *
+     * @return UrlDetectionInterface
+     */
+    public function getUrlDetectionHandler()
+    {
+        if (!$this->urlDetectionHandler instanceof UrlDetectionInterface) {
+            $this->urlDetectionHandler = new FacebookUrlDetectionHandler();
+        }
+
+        return $this->urlDetectionHandler;
+    }
+
+    /**
+     * Returns the default AccessToken entity.
+     *
+     * @return AccessToken|null
+     */
+    public function getDefaultAccessToken()
+    {
+        return $this->defaultAccessToken;
+    }
+
+    /**
+     * Sets the default access token to use with requests.
+     *
+     * @param AccessToken|string $accessToken The access token to save.
+     *
+     * @throws \InvalidArgumentException
+     */
+    public function setDefaultAccessToken($accessToken)
+    {
+        if (is_string($accessToken)) {
+            $this->defaultAccessToken = new AccessToken($accessToken);
+
+            return;
+        }
+
+        if ($accessToken instanceof AccessToken) {
+            $this->defaultAccessToken = $accessToken;
+
+            return;
+        }
+
+        throw new \InvalidArgumentException('The default access token must be of type "string" or Facebook\AccessToken');
+    }
+
+    /**
+     * Returns the default Graph version.
+     *
+     * @return string
+     */
+    public function getDefaultGraphVersion()
+    {
+        return $this->defaultGraphVersion;
+    }
+
+    /**
+     * Returns the redirect login helper.
+     *
+     * @return FacebookRedirectLoginHelper
+     */
+    public function getRedirectLoginHelper()
+    {
+        return new FacebookRedirectLoginHelper(
+            $this->getOAuth2Client(),
+            $this->persistentDataHandler,
+            $this->urlDetectionHandler,
+            $this->pseudoRandomStringGenerator
+        );
+    }
+
+    /**
+     * Returns the JavaScript helper.
+     *
+     * @return FacebookJavaScriptHelper
+     */
+    public function getJavaScriptHelper()
+    {
+        return new FacebookJavaScriptHelper($this->app, $this->client, $this->defaultGraphVersion);
+    }
+
+    /**
+     * Returns the canvas helper.
+     *
+     * @return FacebookCanvasHelper
+     */
+    public function getCanvasHelper()
+    {
+        return new FacebookCanvasHelper($this->app, $this->client, $this->defaultGraphVersion);
+    }
+
+    /**
+     * Returns the page tab helper.
+     *
+     * @return FacebookPageTabHelper
+     */
+    public function getPageTabHelper()
+    {
+        return new FacebookPageTabHelper($this->app, $this->client, $this->defaultGraphVersion);
+    }
+
+    /**
+     * Sends a GET request to Graph and returns the result.
+     *
+     * @param string                  $endpoint
+     * @param AccessToken|string|null $accessToken
+     * @param string|null             $eTag
+     * @param string|null             $graphVersion
+     *
+     * @return FacebookResponse
+     *
+     * @throws FacebookSDKException
+     */
+    public function get($endpoint, $accessToken = null, $eTag = null, $graphVersion = null)
+    {
+        return $this->sendRequest(
+            'GET',
+            $endpoint,
+            $params = [],
+            $accessToken,
+            $eTag,
+            $graphVersion
+        );
+    }
+
+    /**
+     * Sends a POST request to Graph and returns the result.
+     *
+     * @param string                  $endpoint
+     * @param array                   $params
+     * @param AccessToken|string|null $accessToken
+     * @param string|null             $eTag
+     * @param string|null             $graphVersion
+     *
+     * @return FacebookResponse
+     *
+     * @throws FacebookSDKException
+     */
+    public function post($endpoint, array $params = [], $accessToken = null, $eTag = null, $graphVersion = null)
+    {
+        return $this->sendRequest(
+            'POST',
+            $endpoint,
+            $params,
+            $accessToken,
+            $eTag,
+            $graphVersion
+        );
+    }
+
+    /**
+     * Sends a DELETE request to Graph and returns the result.
+     *
+     * @param string                  $endpoint
+     * @param array                   $params
+     * @param AccessToken|string|null $accessToken
+     * @param string|null             $eTag
+     * @param string|null             $graphVersion
+     *
+     * @return FacebookResponse
+     *
+     * @throws FacebookSDKException
+     */
+    public function delete($endpoint, array $params = [], $accessToken = null, $eTag = null, $graphVersion = null)
+    {
+        return $this->sendRequest(
+            'DELETE',
+            $endpoint,
+            $params,
+            $accessToken,
+            $eTag,
+            $graphVersion
+        );
+    }
+
+    /**
+     * Sends a request to Graph for the next page of results.
+     *
+     * @param GraphEdge $graphEdge The GraphEdge to paginate over.
+     *
+     * @return GraphEdge|null
+     *
+     * @throws FacebookSDKException
+     */
+    public function next(GraphEdge $graphEdge)
+    {
+        return $this->getPaginationResults($graphEdge, 'next');
+    }
+
+    /**
+     * Sends a request to Graph for the previous page of results.
+     *
+     * @param GraphEdge $graphEdge The GraphEdge to paginate over.
+     *
+     * @return GraphEdge|null
+     *
+     * @throws FacebookSDKException
+     */
+    public function previous(GraphEdge $graphEdge)
+    {
+        return $this->getPaginationResults($graphEdge, 'previous');
+    }
+
+    /**
+     * Sends a request to Graph for the next page of results.
+     *
+     * @param GraphEdge $graphEdge The GraphEdge to paginate over.
+     * @param string    $direction The direction of the pagination: next|previous.
+     *
+     * @return GraphEdge|null
+     *
+     * @throws FacebookSDKException
+     */
+    public function getPaginationResults(GraphEdge $graphEdge, $direction)
+    {
+        $paginationRequest = $graphEdge->getPaginationRequest($direction);
+        if (!$paginationRequest) {
+            return null;
+        }
+
+        $this->lastResponse = $this->client->sendRequest($paginationRequest);
+
+        // Keep the same GraphNode subclass
+        $subClassName = $graphEdge->getSubClassName();
+        $graphEdge = $this->lastResponse->getGraphEdge($subClassName, false);
+
+        return count($graphEdge) > 0 ? $graphEdge : null;
+    }
+
+    /**
+     * Sends a request to Graph and returns the result.
+     *
+     * @param string                  $method
+     * @param string                  $endpoint
+     * @param array                   $params
+     * @param AccessToken|string|null $accessToken
+     * @param string|null             $eTag
+     * @param string|null             $graphVersion
+     *
+     * @return FacebookResponse
+     *
+     * @throws FacebookSDKException
+     */
+    public function sendRequest($method, $endpoint, array $params = [], $accessToken = null, $eTag = null, $graphVersion = null)
+    {
+        $accessToken = $accessToken ?: $this->defaultAccessToken;
+        $graphVersion = $graphVersion ?: $this->defaultGraphVersion;
+        $request = $this->request($method, $endpoint, $params, $accessToken, $eTag, $graphVersion);
+
+        return $this->lastResponse = $this->client->sendRequest($request);
+    }
+
+    /**
+     * Sends a batched request to Graph and returns the result.
+     *
+     * @param array                   $requests
+     * @param AccessToken|string|null $accessToken
+     * @param string|null             $graphVersion
+     *
+     * @return FacebookBatchResponse
+     *
+     * @throws FacebookSDKException
+     */
+    public function sendBatchRequest(array $requests, $accessToken = null, $graphVersion = null)
+    {
+        $accessToken = $accessToken ?: $this->defaultAccessToken;
+        $graphVersion = $graphVersion ?: $this->defaultGraphVersion;
+        $batchRequest = new FacebookBatchRequest(
+            $this->app,
+            $requests,
+            $accessToken,
+            $graphVersion
+        );
+
+        return $this->lastResponse = $this->client->sendBatchRequest($batchRequest);
+    }
+
+    /**
+     * Instantiates a new FacebookRequest entity.
+     *
+     * @param string                  $method
+     * @param string                  $endpoint
+     * @param array                   $params
+     * @param AccessToken|string|null $accessToken
+     * @param string|null             $eTag
+     * @param string|null             $graphVersion
+     *
+     * @return FacebookRequest
+     *
+     * @throws FacebookSDKException
+     */
+    public function request($method, $endpoint, array $params = [], $accessToken = null, $eTag = null, $graphVersion = null)
+    {
+        $accessToken = $accessToken ?: $this->defaultAccessToken;
+        $graphVersion = $graphVersion ?: $this->defaultGraphVersion;
+
+        return new FacebookRequest(
+            $this->app,
+            $accessToken,
+            $method,
+            $endpoint,
+            $params,
+            $eTag,
+            $graphVersion
+        );
+    }
+
+    /**
+     * Factory to create FacebookFile's.
+     *
+     * @param string $pathToFile
+     *
+     * @return FacebookFile
+     *
+     * @throws FacebookSDKException
+     */
+    public function fileToUpload($pathToFile)
+    {
+        return new FacebookFile($pathToFile);
+    }
+
+    /**
+     * Factory to create FacebookVideo's.
+     *
+     * @param string $pathToFile
+     *
+     * @return FacebookVideo
+     *
+     * @throws FacebookSDKException
+     */
+    public function videoToUpload($pathToFile)
+    {