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<?php |
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/** |
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* Copyright 2017 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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namespace Facebook; |
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use ArrayIterator; |
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use IteratorAggregate; |
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use ArrayAccess; |
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use Facebook\Authentication\AccessToken; |
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use Facebook\Exception\SDKException; |
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/** |
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* @package Facebook |
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*/ |
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class BatchRequest extends Request implements IteratorAggregate, ArrayAccess |
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{ |
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/** |
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* @var array an array of Request entities to send |
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*/ |
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protected $requests = []; |
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/** |
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* @var array an array of files to upload |
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*/ |
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protected $attachedFiles = []; |
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/** |
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* Creates a new Request entity. |
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* |
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* @param null|Application $app |
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* @param array $requests |
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* @param null|AccessToken|string $accessToken |
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* @param null|string $graphVersion |
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*/ |
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public function __construct(Application $app = null, array $requests = [], $accessToken = null, $graphVersion = null) |
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{ |
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parent::__construct($app, $accessToken, 'POST', '', [], null, $graphVersion); |
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$this->add($requests); |
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} |
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/** |
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* Adds a new request to the array. |
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* |
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* @param array|Request $request |
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* @param null|array|string $options Array of batch request options e.g. 'name', 'omit_response_on_success'. |
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* If a string is given, it is the value of the 'name' option. |
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* |
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* @throws \InvalidArgumentException |
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* |
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* @return BatchRequest |
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* @return BatchRequest |
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*/ |
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public function add($request, $options = null) |
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{ |
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if (is_array($request)) { |
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foreach ($request as $key => $req) { |
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$this->add($req, $key); |
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} |
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return $this; |
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} |
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if (!$request instanceof Request) { |
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throw new \InvalidArgumentException('Argument for add() must be of type array or Request.'); |
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} |
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if (null === $options) { |
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$options = []; |
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} elseif (!is_array($options)) { |
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$options = ['name' => $options]; |
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} |
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$this->addFallbackDefaults($request); |
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// File uploads |
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$attachedFiles = $this->extractFileAttachments($request); |
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$name = $options['name'] ?? null; |
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unset($options['name']); |
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$requestToAdd = [ |
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'name' => $name, |
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'request' => $request, |
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'options' => $options, |
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'attached_files' => $attachedFiles, |
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]; |
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$this->requests[] = $requestToAdd; |
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return $this; |
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} |
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/** |
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* Ensures that the Application and access token fall back when missing. |
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* |
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* @param Request $request |
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* |
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* @throws SDKException |
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*/ |
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public function addFallbackDefaults(Request $request) |
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{ |
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if (!$request->getApplication()) { |
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$app = $this->getApplication(); |
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if (!$app) { |
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throw new SDKException('Missing Application on Request and no fallback detected on BatchRequest.'); |
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} |
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$request->setApp($app); |
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} |
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if (!$request->getAccessToken()) { |
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$accessToken = $this->getAccessToken(); |
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if (!$accessToken) { |
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throw new SDKException('Missing access token on Request and no fallback detected on BatchRequest.'); |
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} |
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$request->setAccessToken($accessToken); |
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} |
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} |
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/** |
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* Extracts the files from a request. |
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* |
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* @param Request $request |
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* |
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* @throws SDKException |
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* |
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* @return null|string |
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*/ |
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public function extractFileAttachments(Request $request) |
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{ |
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if (!$request->containsFileUploads()) { |
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return null; |
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} |
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$files = $request->getFiles(); |
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$fileNames = []; |
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foreach ($files as $file) { |
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$fileName = uniqid(); |
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$this->addFile($fileName, $file); |
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$fileNames[] = $fileName; |
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} |
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$request->resetFiles(); |
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// @TODO Does Graph support multiple uploads on one endpoint? |
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return implode(',', $fileNames); |
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} |
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/** |
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* Return the Request entities. |
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* |
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* @return array |
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*/ |
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public function getRequests() |
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{ |
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return $this->requests; |
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} |
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/** |
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* Prepares the requests to be sent as a batch request. |
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*/ |
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public function prepareRequestsForBatch() |
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{ |
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$this->validateBatchRequestCount(); |
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$params = [ |
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'batch' => $this->convertRequestsToJson(), |
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'include_headers' => true, |
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]; |
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$this->setParams($params); |
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} |
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/** |
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* Converts the requests into a JSON(P) string. |
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* |
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* @return string |
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*/ |
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public function convertRequestsToJson() |
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{ |
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$requests = []; |
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foreach ($this->requests as $request) { |
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$options = []; |
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if (null !== $request['name']) { |
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$options['name'] = $request['name']; |
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} |
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$options += $request['options']; |
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$requests[] = $this->requestEntityToBatchArray($request['request'], $options, $request['attached_files']); |
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} |
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return json_encode($requests); |
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} |
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/** |
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* Validate the request count before sending them as a batch. |
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* |
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* @throws SDKException |
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*/ |
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public function validateBatchRequestCount() |
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{ |
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$batchCount = count($this->requests); |
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if ($batchCount === 0) { |
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throw new SDKException('There are no batch requests to send.'); |
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} elseif ($batchCount > 50) { |
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// Per: https://developers.facebook.com/docs/graph-api/making-multiple-requests#limits |
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throw new SDKException('You cannot send more than 50 batch requests at a time.'); |
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} |
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} |
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/** |
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* Converts a Request entity into an array that is batch-friendly. |
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* |
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* @param Request $request the request entity to convert |
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* @param null|array|string $options Array of batch request options e.g. 'name', 'omit_response_on_success'. |
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* If a string is given, it is the value of the 'name' option. |
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* @param null|string $attachedFiles names of files associated with the request |
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* |
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* @return array |
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*/ |
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public function requestEntityToBatchArray(Request $request, $options = null, $attachedFiles = null) |
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{ |
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if (null === $options) { |
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$options = []; |
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} elseif (!is_array($options)) { |
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$options = ['name' => $options]; |
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} |
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$compiledHeaders = []; |
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$headers = $request->getHeaders(); |
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foreach ($headers as $name => $value) { |
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$compiledHeaders[] = $name . ': ' . $value; |
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} |
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$batch = [ |
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'headers' => $compiledHeaders, |
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'method' => $request->getMethod(), |
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'relative_url' => $request->getUrl(), |
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]; |
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// Since file uploads are moved to the root request of a batch request, |
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// the child requests will always be URL-encoded. |
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$body = $request->getUrlEncodedBody()->getBody(); |
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if ($body) { |
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$batch['body'] = $body; |
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} |
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$batch += $options; |
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if (null !== $attachedFiles) { |
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$batch['attached_files'] = $attachedFiles; |
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} |
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return $batch; |
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} |
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/** |
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* Get an iterator for the items. |
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* |
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* @return ArrayIterator |
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*/ |
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public function getIterator() |
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{ |
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return new ArrayIterator($this->requests); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function offsetSet($offset, $value) |
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{ |
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$this->add($value, $offset); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function offsetExists($offset) |
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{ |
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return isset($this->requests[$offset]); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function offsetUnset($offset) |
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{ |
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unset($this->requests[$offset]); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function offsetGet($offset) |
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{ |
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return $this->requests[$offset] ?? null; |
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} |
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} |
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