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<?php |
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/* |
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* Copyright 2016 Jan Eichhorn <[email protected]> |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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namespace ApaiIO\Request; |
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use ApaiIO\ApaiIO; |
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use ApaiIO\Configuration\ConfigurationInterface; |
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use ApaiIO\Operations\OperationInterface; |
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use GuzzleHttp\ClientInterface; |
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use GuzzleHttp\Psr7\Uri; |
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/** |
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* Basic implementation of the rest request |
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* |
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* @see http://docs.aws.amazon.com/AWSECommerceService/2011-08-01/DG/AnatomyOfaRESTRequest.html |
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* @author Jan Eichhorn <[email protected]> |
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*/ |
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class GuzzleRequest implements RequestInterface |
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{ |
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/** |
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* The requestscheme |
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* |
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* @var string |
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*/ |
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private $requestTemplate = "//webservices.amazon.%s/onca/xml?%s"; |
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/** |
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* The scheme for the uri. E.g. http or https. |
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* |
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* @var string |
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*/ |
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private $scheme = 'http'; |
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/** |
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* @var ClientInterface |
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*/ |
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private $client; |
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/** |
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* Initialize instance |
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* |
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* @param ClientInterface $client |
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*/ |
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public function __construct(ClientInterface $client) |
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{ |
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$this->client = $client; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function perform(OperationInterface $operation, ConfigurationInterface $configuration) |
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{ |
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$preparedRequestParams = $this->prepareRequestParams($operation, $configuration); |
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$queryString = $this->buildQueryString($preparedRequestParams, $configuration); |
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$uri = new Uri(sprintf($this->requestTemplate, $configuration->getCountry(), $queryString)); |
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$request = new \GuzzleHttp\Psr7\Request('GET', $uri->withScheme($this->scheme), [ |
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'User-Agent' => 'ApaiIO [' . ApaiIO::VERSION . ']' |
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]); |
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$result = $this->client->send($request); |
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return $result->getBody()->getContents(); |
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} |
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/** |
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* Sets the scheme. |
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* |
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* @param string $scheme |
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*/ |
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public function setScheme($scheme) |
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{ |
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if (!in_array($scheme = strtolower($scheme), ['http', 'https'])) { |
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throw new \InvalidArgumentException('The scheme can only be http or https.'); |
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} |
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$this->scheme = $scheme; |
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} |
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/** |
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* Prepares the parameters for the request |
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* |
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* @param OperationInterface $operation |
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* @param ConfigurationInterface $configuration |
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* |
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* @return array |
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*/ |
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protected function prepareRequestParams(OperationInterface $operation, ConfigurationInterface $configuration) |
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{ |
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$baseRequestParams = [ |
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'Service' => 'AWSECommerceService', |
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'AWSAccessKeyId' => $configuration->getAccessKey(), |
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'AssociateTag' => $configuration->getAssociateTag(), |
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'Operation' => $operation->getName(), |
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'Version' => '2013-08-01', |
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'Timestamp' => Util::getTimeStamp() |
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]; |
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$operationParams = $operation->getOperationParameter(); |
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foreach ($operationParams as $key => $value) { |
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if (true === is_array($value)) { |
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$operationParams[$key] = implode(',', $value); |
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} |
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} |
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$fullParameterList = array_merge($baseRequestParams, $operationParams); |
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ksort($fullParameterList); |
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return $fullParameterList; |
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} |
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/** |
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* Builds the final querystring including the signature |
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* |
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* @param array $params |
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* @param ConfigurationInterface $configuration |
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* |
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* @return string |
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*/ |
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protected function buildQueryString(array $params, ConfigurationInterface $configuration) |
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{ |
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$parameterList = []; |
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foreach ($params as $key => $value) { |
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$parameterList[] = sprintf('%s=%s', $key, rawurlencode($value)); |
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} |
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$parameterList[] = 'Signature=' . rawurlencode( |
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$this->buildSignature($parameterList, $configuration->getCountry(), $configuration->getSecretKey()) |
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); |
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return implode("&", $parameterList); |
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} |
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/** |
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* Calculates the signature for the request |
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* |
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* @param array $params |
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* @param string $country |
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* @param string $secret |
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* |
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* @return string |
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*/ |
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protected function buildSignature(array $params, $country, $secret) |
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{ |
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return Util::buildSignature( |
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sprintf( |
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"GET\nwebservices.amazon.%s\n/onca/xml\n%s", |
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$country, |
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implode('&', $params) |
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), |
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$secret |
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); |
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} |
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} |
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cyrrill /
apai-io
