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<?php |
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/** |
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* Copyright 2016 Facebook, Inc. |
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* |
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* You are hereby granted a non-exclusive, worldwide, royalty-free license to |
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* use, copy, modify, and distribute this software in source code or binary |
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* form for use in connection with the web services and APIs provided by |
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* Facebook. |
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* |
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* As with any software that integrates with the Facebook platform, your use |
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* of this software is subject to the Facebook Developer Principles and |
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* Policies [http://developers.facebook.com/policy/]. This copyright notice |
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* shall be included in all copies or substantial portions of the software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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* DEALINGS IN THE SOFTWARE. |
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* |
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*/ |
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namespace Facebook\Authentication; |
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use Facebook\Facebook; |
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use Facebook\FacebookApp; |
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use Facebook\FacebookRequest; |
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use Facebook\FacebookResponse; |
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use Facebook\FacebookClient; |
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use Facebook\Exceptions\FacebookResponseException; |
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use Facebook\Exceptions\FacebookSDKException; |
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/** |
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* Class OAuth2Client |
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* |
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* @package Facebook |
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*/ |
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class OAuth2Client |
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{ |
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/** |
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* @const string The base authorization URL. |
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*/ |
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const BASE_AUTHORIZATION_URL = 'https://www.facebook.com'; |
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/** |
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* The FacebookApp entity. |
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* |
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* @var FacebookApp |
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*/ |
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protected $app; |
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/** |
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* The Facebook client. |
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* |
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* @var FacebookClient |
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*/ |
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protected $client; |
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/** |
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* The version of the Graph API to use. |
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* |
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* @var string |
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*/ |
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protected $graphVersion; |
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/** |
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* The last request sent to Graph. |
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* |
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* @var FacebookRequest|null |
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*/ |
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protected $lastRequest; |
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/** |
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* @param FacebookApp $app |
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* @param FacebookClient $client |
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* @param string|null $graphVersion The version of the Graph API to use. |
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*/ |
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public function __construct(FacebookApp $app, FacebookClient $client, $graphVersion = null) |
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{ |
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$this->app = $app; |
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$this->client = $client; |
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$this->graphVersion = $graphVersion ?: Facebook::DEFAULT_GRAPH_VERSION; |
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} |
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/** |
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* Returns the last FacebookRequest that was sent. |
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* Useful for debugging and testing. |
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* |
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* @return FacebookRequest|null |
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*/ |
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public function getLastRequest() |
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{ |
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return $this->lastRequest; |
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} |
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/** |
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* Get the metadata associated with the access token. |
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* |
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* @param AccessToken|string $accessToken The access token to debug. |
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* |
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* @return AccessTokenMetadata |
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*/ |
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public function debugToken($accessToken) |
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{ |
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$accessToken = $accessToken instanceof AccessToken ? $accessToken->getValue() : $accessToken; |
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$params = ['input_token' => $accessToken]; |
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$this->lastRequest = new FacebookRequest( |
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$this->app, |
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$this->app->getAccessToken(), |
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'GET', |
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'/debug_token', |
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$params, |
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null, |
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$this->graphVersion |
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); |
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$response = $this->client->sendRequest($this->lastRequest); |
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$metadata = $response->getDecodedBody(); |
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return new AccessTokenMetadata($metadata); |
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} |
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/** |
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* Generates an authorization URL to begin the process of authenticating a user. |
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* |
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* @param string $redirectUrl The callback URL to redirect to. |
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* @param array $scope An array of permissions to request. |
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* @param string $state The CSPRNG-generated CSRF value. |
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* @param array $params An array of parameters to generate URL. |
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* @param string $separator The separator to use in http_build_query(). |
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* |
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* @return string |
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*/ |
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public function getAuthorizationUrl($redirectUrl, $state, array $scope = [], array $params = [], $separator = '&') |
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{ |
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$params += [ |
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'client_id' => $this->app->getId(), |
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'state' => $state, |
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'response_type' => 'code', |
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'sdk' => 'php-sdk-' . Facebook::VERSION, |
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'redirect_uri' => $redirectUrl, |
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'scope' => implode(',', $scope) |
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]; |
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return static::BASE_AUTHORIZATION_URL . '/' . $this->graphVersion . '/dialog/oauth?' . http_build_query($params, null, $separator); |
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} |
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/** |
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* Get a valid access token from a code. |
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* |
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* @param string $code |
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* @param string $redirectUri |
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* |
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* @return AccessToken |
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* |
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* @throws FacebookSDKException |
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*/ |
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public function getAccessTokenFromCode($code, $redirectUri = '') |
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{ |
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$params = [ |
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'code' => $code, |
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'redirect_uri' => $redirectUri, |
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]; |
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return $this->requestAnAccessToken($params); |
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} |
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/** |
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* Exchanges a short-lived access token with a long-lived access token. |
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* |
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* @param AccessToken|string $accessToken |
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* |
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* @return AccessToken |
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* |
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* @throws FacebookSDKException |
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*/ |
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public function getLongLivedAccessToken($accessToken) |
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{ |
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$accessToken = $accessToken instanceof AccessToken ? $accessToken->getValue() : $accessToken; |
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$params = [ |
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'grant_type' => 'fb_exchange_token', |
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'fb_exchange_token' => $accessToken, |
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]; |
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return $this->requestAnAccessToken($params); |
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} |
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/** |
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* Get a valid code from an access token. |
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* |
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* @param AccessToken|string $accessToken |
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* @param string $redirectUri |
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* |
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* @return AccessToken |
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* |
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* @throws FacebookSDKException |
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*/ |
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public function getCodeFromLongLivedAccessToken($accessToken, $redirectUri = '') |
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{ |
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$params = [ |
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'redirect_uri' => $redirectUri, |
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]; |
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$response = $this->sendRequestWithClientParams('/oauth/client_code', $params, $accessToken); |
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$data = $response->getDecodedBody(); |
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if (!isset($data['code'])) { |
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throw new FacebookSDKException('Code was not returned from Graph.', 401); |
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} |
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return $data['code']; |
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} |
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/** |
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* Send a request to the OAuth endpoint. |
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* |
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* @param array $params |
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* |
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* @return AccessToken |
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* |
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* @throws FacebookSDKException |
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*/ |
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protected function requestAnAccessToken(array $params) |
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{ |
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$response = $this->sendRequestWithClientParams('/oauth/access_token', $params); |
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$data = $response->getDecodedBody(); |
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if (!isset($data['access_token'])) { |
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throw new FacebookSDKException('Access token was not returned from Graph.', 401); |
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} |
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// Graph returns two different key names for expiration time |
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// on the same endpoint. Doh! :/ |
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$expiresAt = 0; |
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if (isset($data['expires'])) { |
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// For exchanging a short lived token with a long lived token. |
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// The expiration time in seconds will be returned as "expires". |
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$expiresAt = time() + $data['expires']; |
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} elseif (isset($data['expires_in'])) { |
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// For exchanging a code for a short lived access token. |
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// The expiration time in seconds will be returned as "expires_in". |
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// See: https://developers.facebook.com/docs/facebook-login/access-tokens#long-via-code |
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$expiresAt = time() + $data['expires_in']; |
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} |
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return new AccessToken($data['access_token'], $expiresAt); |
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} |
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/** |
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* Send a request to Graph with an app access token. |
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* |
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* @param string $endpoint |
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* @param array $params |
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* @param AccessToken|string|null $accessToken |
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* |
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* @return FacebookResponse |
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* |
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* @throws FacebookResponseException |
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*/ |
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protected function sendRequestWithClientParams($endpoint, array $params, $accessToken = null) |
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{ |
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$params += $this->getClientParams(); |
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$accessToken = $accessToken ?: $this->app->getAccessToken(); |
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$this->lastRequest = new FacebookRequest( |
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$this->app, |
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$accessToken, |
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'GET', |
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$endpoint, |
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$params, |
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null, |
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$this->graphVersion |
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); |
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return $this->client->sendRequest($this->lastRequest); |
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} |
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/** |
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* Returns the client_* params for OAuth requests. |
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* |
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* @return array |
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*/ |
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protected function getClientParams() |
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{ |
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return [ |
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'client_id' => $this->app->getId(), |
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'client_secret' => $this->app->getSecret(), |
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]; |
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} |
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} |
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