<?php
/*******************************************************************************
 * Copyright 2009-2014 Amazon Services. All Rights Reserved.
 * Licensed under the Apache License, Version 2.0 (the "License");
 *
 * You may not use this file except in compliance with the License.
 * You may obtain a copy of the License at: http://aws.amazon.com/apache2.0
 * This file is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
 * CONDITIONS OF ANY KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations under the License.
 *******************************************************************************
 * PHP Version 5
 * @category Amazon
 * @package  Marketplace Web Service Products
 * @version  2011-10-01
 * Library Version: 2014-10-20
 * Generated: Fri Oct 17 17:59:56 GMT 2014
 */

/**
 * MarketplaceWebServiceProducts_Model_GetCompetitivePricingForASINResponse
 *
 * Properties:
 *

 *
 *
GetCompetitivePricingForASINResult: array

 *
ResponseMetadata: MarketplaceWebServiceProducts_Model_ResponseMetadata

 *
ResponseHeaderMetadata: MarketplaceWebServiceProducts_Model_ResponseHeaderMetadata

 *
 *

 */
class MarketplaceWebServiceProducts_Model_GetCompetitivePricingForASINResponse extends MarketplaceWebServiceProducts_Model
{

    public function __construct($data = null)
    {
        $this->_fields = array(
            'GetCompetitivePricingForASINResult' => array(
                'FieldValue' => array(),
                'FieldType' => array('MarketplaceWebServiceProducts_Model_GetCompetitivePricingForASINResult')
            ),
            'ResponseMetadata' => array(
                'FieldValue' => null,
                'FieldType' => 'MarketplaceWebServiceProducts_Model_ResponseMetadata'
            ),
            'ResponseHeaderMetadata' => array(
                'FieldValue' => null,
                'FieldType' => 'MarketplaceWebServiceProducts_Model_ResponseHeaderMetadata'
            ),
        );
        parent::__construct($data);
    }

    /**
     * Get the value of the GetCompetitivePricingForASINResult property.
     *
     * @return MarketplaceWebServiceProducts_Model_GetCompetitivePricingForASINResult[] GetCompetitivePricingForASINResult.
     */
    public function getGetCompetitivePricingForASINResult()
    {
        if ($this->_fields['GetCompetitivePricingForASINResult']['FieldValue'] == null) {
            $this->_fields['GetCompetitivePricingForASINResult']['FieldValue'] = array();
        }
        return $this->_fields['GetCompetitivePricingForASINResult']['FieldValue'];
    }

    /**
     * Set the value of the GetCompetitivePricingForASINResult property.
     *
     * @param array $value getCompetitivePricingForASINResult
     * @return $this This instance
     */
    public function setGetCompetitivePricingForASINResult($value)
    {
        if (!$this->_isNumericArray($value)) {
            $value = array($value);
        }
        $this->_fields['GetCompetitivePricingForASINResult']['FieldValue'] = $value;
        return $this;
    }

    /**
     * Clear GetCompetitivePricingForASINResult.
     */
    public function unsetGetCompetitivePricingForASINResult()
    {
        $this->_fields['GetCompetitivePricingForASINResult']['FieldValue'] = array();
    }

    /**
     * Check to see if GetCompetitivePricingForASINResult is set.
     *
     * @return true if GetCompetitivePricingForASINResult is set.
     */
    public function isSetGetCompetitivePricingForASINResult()
    {
        return !empty($this->_fields['GetCompetitivePricingForASINResult']['FieldValue']);
    }

    /**
     * Add values for GetCompetitivePricingForASINResult, return this.
     *
     * @param getCompetitivePricingForASINResult
     *             New values to add.
     *
     * @return $this This instance.
     */
    public function withGetCompetitivePricingForASINResult()
    {
        foreach (func_get_args() as $GetCompetitivePricingForASINResult) {
            $this->_fields['GetCompetitivePricingForASINResult']['FieldValue'][] = $GetCompetitivePricingForASINResult;
        }
        return $this;
    }

    /**
     * Get the value of the ResponseMetadata property.
     *
     * @return MarketplaceWebServiceProducts_Model_ResponseMetadata ResponseMetadata.
     */
    public function getResponseMetadata()
    {
        return $this->_fields['ResponseMetadata']['FieldValue'];
    }

    /**
     * Set the value of the ResponseMetadata property.
     *
     * @param MarketplaceWebServiceProducts_Model_ResponseMetadata $value responseMetadata
     * @return $this This instance
     */
    public function setResponseMetadata($value)
    {
        $this->_fields['ResponseMetadata']['FieldValue'] = $value;
        return $this;
    }

    /**
     * Check to see if ResponseMetadata is set.
     *
     * @return true if ResponseMetadata is set.
     */
    public function isSetResponseMetadata()
    {
        return !is_null($this->_fields['ResponseMetadata']['FieldValue']);
    }

    /**
     * Set the value of ResponseMetadata, return this.
     *
     * @param responseMetadata
     *             The new value to set.
     *
     * @return $this This instance.
     */
    public function withResponseMetadata($value)
    {
        $this->setResponseMetadata($value);
        return $this;
    }

    /**
     * Get the value of the ResponseHeaderMetadata property.
     *
     * @return MarketplaceWebServiceProducts_Model_ResponseHeaderMetadata ResponseHeaderMetadata.
     */
    public function getResponseHeaderMetadata()
    {
        return $this->_fields['ResponseHeaderMetadata']['FieldValue'];
    }

    /**
     * Set the value of the ResponseHeaderMetadata property.
     *
     * @param MarketplaceWebServiceProducts_Model_ResponseHeaderMetadata $value responseHeaderMetadata
     * @return $this This instance
     */
    public function setResponseHeaderMetadata($value)
    {
        $this->_fields['ResponseHeaderMetadata']['FieldValue'] = $value;
        return $this;
    }

    /**
     * Check to see if ResponseHeaderMetadata is set.
     *
     * @return true if ResponseHeaderMetadata is set.
     */
    public function isSetResponseHeaderMetadata()
    {
        return !is_null($this->_fields['ResponseHeaderMetadata']['FieldValue']);
    }

    /**
     * Set the value of ResponseHeaderMetadata, return this.
     *
     * @param responseHeaderMetadata
     *             The new value to set.
     *
     * @return $this This instance.
     */
    public function withResponseHeaderMetadata($value)
    {
        $this->setResponseHeaderMetadata($value);
        return $this;
    }

    /**
     * Construct MarketplaceWebServiceProducts_Model_GetCompetitivePricingForASINResponse from XML string
     *
     * @param $xml
     *        XML string to construct from
     * @return MarketplaceWebServiceProducts_Model_GetCompetitivePricingForASINResponse
     * @throws Exception
     */
    public static function fromXML($xml)
    {
        $dom = new DOMDocument();
        $dom->loadXML($xml);
        $xpath = new DOMXPath($dom);
        $response = $xpath->query("//*[local-name()='GetCompetitivePricingForASINResponse']");
        if ($response->length == 1) {
            return new MarketplaceWebServiceProducts_Model_GetCompetitivePricingForASINResponse(($response->item(0)));
        } else {
            throw new Exception ("Unable to construct MarketplaceWebServiceProducts_Model_GetCompetitivePricingForASINResponse from provided XML.
                                  Make sure that GetCompetitivePricingForASINResponse is a root element");
        }
    }

    /**
     * XML Representation for this object
     *
     * @return string XML for this object
     */
    public function toXML()
    {
        $xml = "";
        $xml .= "<GetCompetitivePricingForASINResponse xmlns=\"http://mws.amazonservices.com/schema/Products/2011-10-01\">";
        $xml .= $this->_toXMLFragment();
        $xml .= "</GetCompetitivePricingForASINResponse>";
        return $xml;
    }

}


<?php
/*******************************************************************************
 * Copyright 2009-2014 Amazon Services. All Rights Reserved.
 * Licensed under the Apache License, Version 2.0 (the "License");
 *
 * You may not use this file except in compliance with the License.
 * You may obtain a copy of the License at: http://aws.amazon.com/apache2.0
 * This file is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
 * CONDITIONS OF ANY KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations under the License.
 *******************************************************************************
 * PHP Version 5
 * @category Amazon
 * @package  FBA Inbound Service MWS
 * @version  2010-10-01
 * Library Version: 2014-09-30
 * Generated: Fri Nov 21 18:21:09 GMT 2014
 */

/**
 * FBAInboundServiceMWS_Client is an implementation of FBAInboundServiceMWS
 *
 */
class FBAInboundServiceMWS_Client implements FBAInboundServiceMWS_Interface
{

    const SERVICE_VERSION = '2010-10-01';
    const MWS_CLIENT_VERSION = '2014-09-30';

    /** @var string */
    private $_awsAccessKeyId = null;

    /** @var string */
    private $_awsSecretAccessKey = null;

    /** @var array */
    private $_config = array(
        'ServiceURL' => null,
        'UserAgent' => 'FBAInboundServiceMWS PHP5 Library',
        'SignatureVersion' => 2,
        'SignatureMethod' => 'HmacSHA256',
        'ProxyHost' => null,
        'ProxyPort' => -1,
        'MaxErrorRetry' => 3,
        'Headers' => array(),
        'SSL_VerifyPeer' => true,
        'SSL_VerifyHost' => 2,
    );

    /**
     * Confirm Transport Request
     * Confirms the estimate returned by the EstimateTransportRequest operation.
     *     Once this operation has been called successfully, the seller agrees to allow Amazon to charge
     *     their account the amount returned in the estimate.
     *
     * @param mixed $request array of parameters for FBAInboundServiceMWS_Model_ConfirmTransportRequest request or FBAInboundServiceMWS_Model_ConfirmTransportRequest object itself
     * @see FBAInboundServiceMWS_Model_ConfirmTransportInputRequest
     * @return FBAInboundServiceMWS_Model_ConfirmTransportRequestResponse
     *
     * @throws FBAInboundServiceMWS_Exception
     */
    public function confirmTransportRequest($request)
    {
        if (!($request instanceof FBAInboundServiceMWS_Model_ConfirmTransportInputRequest)) {
            $request = new FBAInboundServiceMWS_Model_ConfirmTransportInputRequest($request);
        }
        $parameters = $request->toQueryParameterArray();
        $parameters['Action'] = 'ConfirmTransportRequest';
        $httpResponse = $this->_invoke($parameters);

        $response = FBAInboundServiceMWS_Model_ConfirmTransportRequestResponse::fromXML($httpResponse['ResponseBody']);
        $response->setResponseHeaderMetadata($httpResponse['ResponseHeaderMetadata']);
        return $response;
    }

    /**
     * Create Inbound Shipment
     * Creates an inbound shipment. It may include up to 200 items.
     * The initial status of a shipment will be set to 'Working'.
     * This operation will simply return a shipment Id upon success,
     * otherwise an explicit error will be returned.
     * More items may be added using the Update call.
     *
     * @param mixed $request array of parameters for FBAInboundServiceMWS_Model_CreateInboundShipment request or FBAInboundServiceMWS_Model_CreateInboundShipment object itself
     * @see FBAInboundServiceMWS_Model_CreateInboundShipmentRequest
     * @return FBAInboundServiceMWS_Model_CreateInboundShipmentResponse
     *
     * @throws FBAInboundServiceMWS_Exception
     */
    public function createInboundShipment($request)
    {
        if (!($request instanceof FBAInboundServiceMWS_Model_CreateInboundShipmentRequest)) {
            $request = new FBAInboundServiceMWS_Model_CreateInboundShipmentRequest($request);
        }
        $parameters = $request->toQueryParameterArray();
        $parameters['Action'] = 'CreateInboundShipment';
        $httpResponse = $this->_invoke($parameters);

        $response = FBAInboundServiceMWS_Model_CreateInboundShipmentResponse::fromXML($httpResponse['ResponseBody']);
        $response->setResponseHeaderMetadata($httpResponse['ResponseHeaderMetadata']);
        return $response;
    }

    /**
     * Create Inbound Shipment Plan
     * Plans inbound shipments for a set of items.  Registers identifiers if needed,
     * and assigns ShipmentIds for planned shipments.
     * When all the items are not all in the same category (e.g. some sortable, some
     * non-sortable) it may be necessary to create multiple shipments (one for each
     * of the shipment groups returned).
     *
     * @param mixed $request array of parameters for FBAInboundServiceMWS_Model_CreateInboundShipmentPlan request or FBAInboundServiceMWS_Model_CreateInboundShipmentPlan object itself
     * @see FBAInboundServiceMWS_Model_CreateInboundShipmentPlanRequest
     * @return FBAInboundServiceMWS_Model_CreateInboundShipmentPlanResponse
     *
     * @throws FBAInboundServiceMWS_Exception
     */
    public function createInboundShipmentPlan($request)
    {
        if (!($request instanceof FBAInboundServiceMWS_Model_CreateInboundShipmentPlanRequest)) {
            $request = new FBAInboundServiceMWS_Model_CreateInboundShipmentPlanRequest($request);
        }
        $parameters = $request->toQueryParameterArray();
        $parameters['Action'] = 'CreateInboundShipmentPlan';
        $httpResponse = $this->_invoke($parameters);

        $response = FBAInboundServiceMWS_Model_CreateInboundShipmentPlanResponse::fromXML($httpResponse['ResponseBody']);
        $response->setResponseHeaderMetadata($httpResponse['ResponseHeaderMetadata']);
        return $response;
    }

    /**
     * Estimate Transport Request
     * Initiates the process for requesting an estimated shipping cost based-on the shipment
     *     for which the request is being made, whether or not the carrier shipment is partnered/non-partnered
     *     and the carrier type.
     *
     * @param mixed $request array of parameters for FBAInboundServiceMWS_Model_EstimateTransportRequest request or FBAInboundServiceMWS_Model_EstimateTransportRequest object itself
     * @see FBAInboundServiceMWS_Model_EstimateTransportInputRequest
     * @return FBAInboundServiceMWS_Model_EstimateTransportRequestResponse
     *
     * @throws FBAInboundServiceMWS_Exception
     */
    public function estimateTransportRequest($request)
    {
        if (!($request instanceof FBAInboundServiceMWS_Model_EstimateTransportInputRequest)) {
            $request = new FBAInboundServiceMWS_Model_EstimateTransportInputRequest($request);
        }
        $parameters = $request->toQueryParameterArray();
        $parameters['Action'] = 'EstimateTransportRequest';
        $httpResponse = $this->_invoke($parameters);

        $response = FBAInboundServiceMWS_Model_EstimateTransportRequestResponse::fromXML($httpResponse['ResponseBody']);
        $response->setResponseHeaderMetadata($httpResponse['ResponseHeaderMetadata']);
        return $response;
    }

    /**
     * Get Bill Of Lading
     * Retrieves the PDF-formatted BOL data for a partnered LTL shipment.
     *     This PDF data will be ZIP'd and then it will be encoded as a Base64 string, and a
     *     MD5 hash is included with the response to validate the BOL data which will be encoded as Base64.
     *
     * @param mixed $request array of parameters for FBAInboundServiceMWS_Model_GetBillOfLading request or FBAInboundServiceMWS_Model_GetBillOfLading object itself
     * @see FBAInboundServiceMWS_Model_GetBillOfLadingRequest
     * @return FBAInboundServiceMWS_Model_GetBillOfLadingResponse
     *
     * @throws FBAInboundServiceMWS_Exception
     */
    public function getBillOfLading($request)
    {
        if (!($request instanceof FBAInboundServiceMWS_Model_GetBillOfLadingRequest)) {
            $request = new FBAInboundServiceMWS_Model_GetBillOfLadingRequest($request);
        }
        $parameters = $request->toQueryParameterArray();
        $parameters['Action'] = 'GetBillOfLading';
        $httpResponse = $this->_invoke($parameters);

        $response = FBAInboundServiceMWS_Model_GetBillOfLadingResponse::fromXML($httpResponse['ResponseBody']);
        $response->setResponseHeaderMetadata($httpResponse['ResponseHeaderMetadata']);
        return $response;
    }

    /**
     * Get Package Labels
     * Retrieves the PDF-formatted package label data for the packages of the
     *     shipment. These labels will include relevant data for shipments utilizing
     *     Amazon-partnered carriers. The PDF data will be ZIP'd and then it will be encoded as a Base64 string, and
     *     MD5 hash is included with the response to validate the label data which will be encoded as Base64.
     *     The language of the address and FC prep instructions sections of the labels are
     *     determined by the marketplace in which the request is being made and the marketplace of
     *     the destination FC, respectively.
     *
     *     Only select PageTypes are supported in each marketplace. By marketplace, the
     *     supported types are:
     *       * US non-partnered UPS: PackageLabel_Letter_6
     *       * US partnered-UPS: PackageLabel_Letter_2
     *       * GB, DE, FR, IT, ES: PackageLabel_A4_4, PackageLabel_Plain_Paper
     *       * Partnered EU: ? <!-- TODO: define this -->
     *       * JP/CN: PackageLabel_Plain_Paper
     *
     * @param mixed $request array of parameters for FBAInboundServiceMWS_Model_GetPackageLabels request or FBAInboundServiceMWS_Model_GetPackageLabels object itself
     * @see FBAInboundServiceMWS_Model_GetPackageLabelsRequest
     * @return FBAInboundServiceMWS_Model_GetPackageLabelsResponse
     *
     * @throws FBAInboundServiceMWS_Exception
     */
    public function getPackageLabels($request)
    {
        if (!($request instanceof FBAInboundServiceMWS_Model_GetPackageLabelsRequest)) {
            $request = new FBAInboundServiceMWS_Model_GetPackageLabelsRequest($request);
        }
        $parameters = $request->toQueryParameterArray();
        $parameters['Action'] = 'GetPackageLabels';
        $httpResponse = $this->_invoke($parameters);

        $response = FBAInboundServiceMWS_Model_GetPackageLabelsResponse::fromXML($httpResponse['ResponseBody']);
        $response->setResponseHeaderMetadata($httpResponse['ResponseHeaderMetadata']);
        return $response;
    }

    /**
     * Get Prep Instructions For ASIN
     * Returns the required prep that must be performed for a set of items, identified
     * by ASINs, that will be sent to Amazon. It returns guidance for the seller
     * on how to prepare the items to be sent in to Amazon's Fulfillment Centers, and
     * identifies the labeling required for the items, and gives the seller a list
     * of additional required prep that must be performed.
     *
     * @param mixed $request array of parameters for FBAInboundServiceMWS_Model_GetPrepInstructionsForASIN request or FBAInboundServiceMWS_Model_GetPrepInstructionsForASIN object itself
     * @see FBAInboundServiceMWS_Model_GetPrepInstructionsForASINRequest
     * @return FBAInboundServiceMWS_Model_GetPrepInstructionsForASINResponse
     *
     * @throws FBAInboundServiceMWS_Exception
     */
    public function getPrepInstructionsForASIN($request)
    {
        if (!($request instanceof FBAInboundServiceMWS_Model_GetPrepInstructionsForASINRequest)) {
            $request = new FBAInboundServiceMWS_Model_GetPrepInstructionsForASINRequest($request);
        }
        $parameters = $request->toQueryParameterArray();
        $parameters['Action'] = 'GetPrepInstructionsForASIN';
        $httpResponse = $this->_invoke($parameters);

        $response = FBAInboundServiceMWS_Model_GetPrepInstructionsForASINResponse::fromXML($httpResponse['ResponseBody']);
        $response->setResponseHeaderMetadata($httpResponse['ResponseHeaderMetadata']);
        return $response;
    }

    /**
     * Get Prep Instructions For SKU
     * Returns the required prep that must be performed for a set of items, identified
     * by SellerSKUs, that will be sent to Amazon. It returns guidance for the seller
     * on how to prepare the items to be sent in to Amazon's Fulfillment Centers, and
     * identifies the labeling required for the items, and gives the seller a list
     * of additional required prep that must be performed.
     *
     * @param mixed $request array of parameters for FBAInboundServiceMWS_Model_GetPrepInstructionsForSKU request or FBAInboundServiceMWS_Model_GetPrepInstructionsForSKU object itself
     * @see FBAInboundServiceMWS_Model_GetPrepInstructionsForSKURequest
     * @return FBAInboundServiceMWS_Model_GetPrepInstructionsForSKUResponse
     *
     * @throws FBAInboundServiceMWS_Exception
     */
    public function getPrepInstructionsForSKU($request)
    {
        if (!($request instanceof FBAInboundServiceMWS_Model_GetPrepInstructionsForSKURequest)) {
            $request = new FBAInboundServiceMWS_Model_GetPrepInstructionsForSKURequest($request);
        }
        $parameters = $request->toQueryParameterArray();
        $parameters['Action'] = 'GetPrepInstructionsForSKU';
        $httpResponse = $this->_invoke($parameters);

        $response = FBAInboundServiceMWS_Model_GetPrepInstructionsForSKUResponse::fromXML($httpResponse['ResponseBody']);
        $response->setResponseHeaderMetadata($httpResponse['ResponseHeaderMetadata']);
        return $response;
    }

    /**
     * Get Service Status
     * Gets the status of the service.
     *   Status is one of GREEN, RED representing:
     *   GREEN: The service section is operating normally.
     *   RED: The service section disruption.
     *
     * @param mixed $request array of parameters for FBAInboundServiceMWS_Model_GetServiceStatus request or FBAInboundServiceMWS_Model_GetServiceStatus object itself
     * @see FBAInboundServiceMWS_Model_GetServiceStatusRequest
     * @return FBAInboundServiceMWS_Model_GetServiceStatusResponse
     *
     * @throws FBAInboundServiceMWS_Exception
     */
    public function getServiceStatus($request)
    {
        if (!($request instanceof FBAInboundServiceMWS_Model_GetServiceStatusRequest)) {
            $request = new FBAInboundServiceMWS_Model_GetServiceStatusRequest($request);
        }
        $parameters = $request->toQueryParameterArray();
        $parameters['Action'] = 'GetServiceStatus';
        $httpResponse = $this->_invoke($parameters);

        $response = FBAInboundServiceMWS_Model_GetServiceStatusResponse::fromXML($httpResponse['ResponseBody']);
        $response->setResponseHeaderMetadata($httpResponse['ResponseHeaderMetadata']);
        return $response;
    }

    /**
     * Get Transport Content
     * A read-only operation which sellers use to retrieve the current
     *     details about the transportation of an inbound shipment, including status of the
     *     partnered carrier workflow and status of individual packages when they arrive at our FCs.
     *
     * @param mixed $request array of parameters for FBAInboundServiceMWS_Model_GetTransportContent request or FBAInboundServiceMWS_Model_GetTransportContent object itself
     * @see FBAInboundServiceMWS_Model_GetTransportContentRequest
     * @return FBAInboundServiceMWS_Model_GetTransportContentResponse
     *
     * @throws FBAInboundServiceMWS_Exception
     */
    public function getTransportContent($request)
    {
        if (!($request instanceof FBAInboundServiceMWS_Model_GetTransportContentRequest)) {
            $request = new FBAInboundServiceMWS_Model_GetTransportContentRequest($request);
        }
        $parameters = $request->toQueryParameterArray();
        $parameters['Action'] = 'GetTransportContent';
        $httpResponse = $this->_invoke($parameters);

        $response = FBAInboundServiceMWS_Model_GetTransportContentResponse::fromXML($httpResponse['ResponseBody']);
        $response->setResponseHeaderMetadata($httpResponse['ResponseHeaderMetadata']);
        return $response;
    }

    /**
     * List Inbound Shipment Items
     * Gets the first set of inbound shipment items for the given ShipmentId or
     * all inbound shipment items updated between the given date range.
     * A NextToken is also returned to further iterate through the Seller's
     * remaining inbound shipment items. To get the next set of inbound
     * shipment items, you must call ListInboundShipmentItemsByNextToken and
     * pass in the 'NextToken' this call returned. If a NextToken is not
     * returned, it indicates the end-of-data. Use LastUpdatedBefore
     * and LastUpdatedAfter to filter results based on last updated time.
     * Either the ShipmentId or a pair of LastUpdatedBefore and LastUpdatedAfter
     * must be passed in. if ShipmentId is set, the LastUpdatedBefore and
     * LastUpdatedAfter will be ignored.
     *
     * @param mixed $request array of parameters for FBAInboundServiceMWS_Model_ListInboundShipmentItems request or FBAInboundServiceMWS_Model_ListInboundShipmentItems object itself
     * @see FBAInboundServiceMWS_Model_ListInboundShipmentItemsRequest
     * @return FBAInboundServiceMWS_Model_ListInboundShipmentItemsResponse
     *
     * @throws FBAInboundServiceMWS_Exception
     */
    public function listInboundShipmentItems($request)
    {
        if (!($request instanceof FBAInboundServiceMWS_Model_ListInboundShipmentItemsRequest)) {
            $request = new FBAInboundServiceMWS_Model_ListInboundShipmentItemsRequest($request);
        }
        $parameters = $request->toQueryParameterArray();
        $parameters['Action'] = 'ListInboundShipmentItems';
        $httpResponse = $this->_invoke($parameters);

        $response = FBAInboundServiceMWS_Model_ListInboundShipmentItemsResponse::fromXML($httpResponse['ResponseBody']);
        $response->setResponseHeaderMetadata($httpResponse['ResponseHeaderMetadata']);
        return $response;
    }

    /**
     * List Inbound Shipment Items By Next Token
     * Gets the next set of inbound shipment items with the NextToken
     * which can be used to iterate through the remaining inbound shipment
     * items. If a NextToken is not returned, it indicates the end-of-data.
     * You must first call ListInboundShipmentItems to get a 'NextToken'.
     *
     * @param mixed $request array of parameters for FBAInboundServiceMWS_Model_ListInboundShipmentItemsByNextToken request or FBAInboundServiceMWS_Model_ListInboundShipmentItemsByNextToken object itself
     * @see FBAInboundServiceMWS_Model_ListInboundShipmentItemsByNextTokenRequest
     * @return FBAInboundServiceMWS_Model_ListInboundShipmentItemsByNextTokenResponse
     *
     * @throws FBAInboundServiceMWS_Exception
     */
    public function listInboundShipmentItemsByNextToken($request)
    {
        if (!($request instanceof FBAInboundServiceMWS_Model_ListInboundShipmentItemsByNextTokenRequest)) {
            $request = new FBAInboundServiceMWS_Model_ListInboundShipmentItemsByNextTokenRequest($request);
        }
        $parameters = $request->toQueryParameterArray();
        $parameters['Action'] = 'ListInboundShipmentItemsByNextToken';
        $httpResponse = $this->_invoke($parameters);

        $response = FBAInboundServiceMWS_Model_ListInboundShipmentItemsByNextTokenResponse::fromXML($httpResponse['ResponseBody']);
        $response->setResponseHeaderMetadata($httpResponse['ResponseHeaderMetadata']);
        return $response;
    }

    /**
     * List Inbound Shipments
     * Get the first set of inbound shipments created by a Seller according to
     * the specified shipment status or the specified shipment Id. A NextToken
     * is also returned to further iterate through the Seller's remaining
     * shipments. If a NextToken is not returned, it indicates the end-of-data.
     * At least one of ShipmentStatusList and ShipmentIdList must be passed in.
     * if both are passed in, then only shipments that match the specified
     * shipment Id and specified shipment status will be returned.
     * the LastUpdatedBefore and LastUpdatedAfter are optional, they are used
     * to filter results based on last update time of the shipment.
     *
     * @param mixed $request array of parameters for FBAInboundServiceMWS_Model_ListInboundShipments request or FBAInboundServiceMWS_Model_ListInboundShipments object itself
     * @see FBAInboundServiceMWS_Model_ListInboundShipmentsRequest
     * @return FBAInboundServiceMWS_Model_ListInboundShipmentsResponse
     *
     * @throws FBAInboundServiceMWS_Exception
     */
    public function listInboundShipments($request)
    {
        if (!($request instanceof FBAInboundServiceMWS_Model_ListInboundShipmentsRequest)) {
            $request = new FBAInboundServiceMWS_Model_ListInboundShipmentsRequest($request);
        }
        $parameters = $request->toQueryParameterArray();
        $parameters['Action'] = 'ListInboundShipments';
        $httpResponse = $this->_invoke($parameters);

        $response = FBAInboundServiceMWS_Model_ListInboundShipmentsResponse::fromXML($httpResponse['ResponseBody']);
        $response->setResponseHeaderMetadata($httpResponse['ResponseHeaderMetadata']);
        return $response;
    }

    /**
     * List Inbound Shipments By Next Token
     * Gets the next set of inbound shipments created by a Seller with the
     * NextToken which can be used to iterate through the remaining inbound
     * shipments. If a NextToken is not returned, it indicates the end-of-data.
     *
     * @param mixed $request array of parameters for FBAInboundServiceMWS_Model_ListInboundShipmentsByNextToken request or FBAInboundServiceMWS_Model_ListInboundShipmentsByNextToken object itself
     * @see FBAInboundServiceMWS_Model_ListInboundShipmentsByNextTokenRequest
     * @return FBAInboundServiceMWS_Model_ListInboundShipmentsByNextTokenResponse
     *
     * @throws FBAInboundServiceMWS_Exception
     */
    public function listInboundShipmentsByNextToken($request)
    {
        if (!($request instanceof FBAInboundServiceMWS_Model_ListInboundShipmentsByNextTokenRequest)) {
            $request = new FBAInboundServiceMWS_Model_ListInboundShipmentsByNextTokenRequest($request);
        }
        $parameters = $request->toQueryParameterArray();
        $parameters['Action'] = 'ListInboundShipmentsByNextToken';
        $httpResponse = $this->_invoke($parameters);

        $response = FBAInboundServiceMWS_Model_ListInboundShipmentsByNextTokenResponse::fromXML($httpResponse['ResponseBody']);
        $response->setResponseHeaderMetadata($httpResponse['ResponseHeaderMetadata']);
        return $response;
    }

    /**
     * Put Transport Content
     * A write operation which sellers use to provide transportation details regarding
     *     how an inbound shipment will arrive at Amazon's Fulfillment Centers.
     *
     * @param mixed $request array of parameters for FBAInboundServiceMWS_Model_PutTransportContent request or FBAInboundServiceMWS_Model_PutTransportContent object itself
     * @see FBAInboundServiceMWS_Model_PutTransportContentRequest
     * @return FBAInboundServiceMWS_Model_PutTransportContentResponse
     *
     * @throws FBAInboundServiceMWS_Exception
     */
    public function putTransportContent($request)
    {
        if (!($request instanceof FBAInboundServiceMWS_Model_PutTransportContentRequest)) {
            $request = new FBAInboundServiceMWS_Model_PutTransportContentRequest($request);
        }
        $parameters = $request->toQueryParameterArray();
        $parameters['Action'] = 'PutTransportContent';
        $httpResponse = $this->_invoke($parameters);

        $response = FBAInboundServiceMWS_Model_PutTransportContentResponse::fromXML($httpResponse['ResponseBody']);
        $response->setResponseHeaderMetadata($httpResponse['ResponseHeaderMetadata']);
        return $response;
    }

    /**
     * Update Inbound Shipment
     * Updates an pre-existing inbound shipment specified by the
     * ShipmentId. It may include up to 200 items.
     * If InboundShipmentHeader is set. it replaces the header information
     * for the given shipment.
     * If InboundShipmentItems is set. it adds, replaces and removes
     * the line time to inbound shipment.
     * For non-existing item, it will add the item for new line item;
     * For existing line items, it will replace the QuantityShipped for the item.
     * For QuantityShipped = 0, it indicates the item should be removed from the shipment
     *
     * This operation will simply return a shipment Id upon success,
     * otherwise an explicit error will be returned.
     *
     * @param mixed $request array of parameters for FBAInboundServiceMWS_Model_UpdateInboundShipment request or FBAInboundServiceMWS_Model_UpdateInboundShipment object itself
     * @see FBAInboundServiceMWS_Model_UpdateInboundShipmentRequest
     * @return FBAInboundServiceMWS_Model_UpdateInboundShipmentResponse
     *
     * @throws FBAInboundServiceMWS_Exception
     */
    public function updateInboundShipment($request)
    {
        if (!($request instanceof FBAInboundServiceMWS_Model_UpdateInboundShipmentRequest)) {
            $request = new FBAInboundServiceMWS_Model_UpdateInboundShipmentRequest($request);
        }
        $parameters = $request->toQueryParameterArray();
        $parameters['Action'] = 'UpdateInboundShipment';
        $httpResponse = $this->_invoke($parameters);

        $response = FBAInboundServiceMWS_Model_UpdateInboundShipmentResponse::fromXML($httpResponse['ResponseBody']);
        $response->setResponseHeaderMetadata($httpResponse['ResponseHeaderMetadata']);
        return $response;
    }

    /**
     * Void Transport Request
     * Voids a previously-confirmed transport request. It only succeeds for requests
     *     made by the VoidDeadline provided in the PartneredEstimate component of the
     *     response of the GetTransportContent operation for a shipment. Currently this
     *     deadline is 24 hours after confirming a transport request for a partnered small parcel
     *     request and 1 hour after confirming a transport request for a partnered LTL/TL
     *     request, though this is subject to change at any time without notice.
     *
     * @param mixed $request array of parameters for FBAInboundServiceMWS_Model_VoidTransportRequest request or FBAInboundServiceMWS_Model_VoidTransportRequest object itself
     * @see FBAInboundServiceMWS_Model_VoidTransportInputRequest
     * @return FBAInboundServiceMWS_Model_VoidTransportRequestResponse
     *
     * @throws FBAInboundServiceMWS_Exception
     */
    public function voidTransportRequest($request)
    {
        if (!($request instanceof FBAInboundServiceMWS_Model_VoidTransportInputRequest)) {
            $request = new FBAInboundServiceMWS_Model_VoidTransportInputRequest($request);
        }
        $parameters = $request->toQueryParameterArray();
        $parameters['Action'] = 'VoidTransportRequest';
        $httpResponse = $this->_invoke($parameters);

        $response = FBAInboundServiceMWS_Model_VoidTransportRequestResponse::fromXML($httpResponse['ResponseBody']);
        $response->setResponseHeaderMetadata($httpResponse['ResponseHeaderMetadata']);
        return $response;
    }

    /**
     * Construct new Client
     *
     * @param string $awsAccessKeyId AWS Access Key ID
     * @param string $awsSecretAccessKey AWS Secret Access Key
     * @param $applicationName
     * @param $applicationVersion
     * @param array $config configuration options.
     * Valid configuration options are:
     * <ul>
     * <li>ServiceURL</li>
     * <li>UserAgent</li>
     * <li>SignatureVersion</li>
     * <li>TimesRetryOnError</li>
     * <li>ProxyHost</li>
     * <li>ProxyPort</li>
     * <li>MaxErrorRetry</li>
     * </ul>
     */
    public function __construct(
        $awsAccessKeyId,
        $awsSecretAccessKey,
        $applicationName,
        $applicationVersion,
        $config = null
    ) {
        if(version_compare(PHP_VERSION, '5.6.0', '<')) {
            iconv_set_encoding('output_encoding', 'UTF-8');
            iconv_set_encoding('input_encoding', 'UTF-8');
            iconv_set_encoding('internal_encoding', 'UTF-8');
        }

        $this->_awsAccessKeyId = $awsAccessKeyId;
        $this->_awsSecretAccessKey = $awsSecretAccessKey;
        if (!is_null($config)) {
            $this->_config = array_merge($this->_config, $config);
        }
        $this->setUserAgentHeader($applicationName, $applicationVersion);
    }

    private function setUserAgentHeader(
        $applicationName,
        $applicationVersion,
        $attributes = null
    ) {

        if (is_null($attributes)) {
            $attributes = array();
        }

        $this->_config['UserAgent'] = $this->constructUserAgentHeader($applicationName, $applicationVersion,
            $attributes);
    }

    private function constructUserAgentHeader($applicationName, $applicationVersion, $attributes = null)
    {
        if (is_null($applicationName) || $applicationName === "") {
            throw new InvalidArgumentException('$applicationName cannot be null');
        }

        if (is_null($applicationVersion) || $applicationVersion === "") {
            throw new InvalidArgumentException('$applicationVersion cannot be null');
        }

        $userAgent = $this->quoteApplicationName($applicationName) . '/' . $this->quoteApplicationVersion($applicationVersion);

        $userAgent .= ' (';
        $userAgent .= 'Language=PHP/' . phpversion();
        $userAgent .= '; ';
        $userAgent .= 'Platform=' . php_uname('s') . '/' . php_uname('m') . '/' . php_uname('r');
        $userAgent .= '; ';
        $userAgent .= 'MWSClientVersion=' . self::MWS_CLIENT_VERSION;

        foreach ($attributes as $key => $value) {
            if (empty($value)) {
                throw new InvalidArgumentException("Value for $key cannot be null or empty.");
            }

            $userAgent .= '; ' . $this->quoteAttributeName($key) . '=' . $this->quoteAttributeValue($value);
        }

        $userAgent .= ')';

        return $userAgent;
    }

    /**
     * Collapse multiple whitespace characters into a single ' ' character.
     * @param $s
     * @return string
     */
    private function collapseWhitespace($s)
    {
        return preg_replace('/ {2,}|\s/', ' ', $s);
    }

    /**
     * Collapse multiple whitespace characters into a single ' ' and backslash escape '\',
     * and '/' characters from a string.
     * @param $s
     * @return string
     */
    private function quoteApplicationName($s)
    {
        $quotedString = $this->collapseWhitespace($s);
        $quotedString = preg_replace('/\\\\/', '\\\\\\\\', $quotedString);
        $quotedString = preg_replace('/\//', '\\/', $quotedString);

        return $quotedString;
    }

    /**
     * Collapse multiple whitespace characters into a single ' ' and backslash escape '\',
     * and '(' characters from a string.
     *
     * @param $s
     * @return string
     */
    private function quoteApplicationVersion($s)
    {
        $quotedString = $this->collapseWhitespace($s);
        $quotedString = preg_replace('/\\\\/', '\\\\\\\\', $quotedString);
        $quotedString = preg_replace('/\\(/', '\\(', $quotedString);

        return $quotedString;
    }

    /**
     * Collapse multiple whitespace characters into a single ' ' and backslash escape '\',
     * and '=' characters from a string.
     *
     * @param string $s
     * @return string
     */
    private function quoteAttributeName($s)
    {
        $quotedString = $this->collapseWhitespace($s);
        $quotedString = preg_replace('/\\\\/', '\\\\\\\\', $quotedString);
        $quotedString = preg_replace('/\\=/', '\\=', $quotedString);

        return $quotedString;
    }

    /**
     * Collapse multiple whitespace characters into a single ' ' and backslash escape ';', '\',
     * and ')' characters from a string.
     *
     * @param string $s
     * @return string
     */
    private function quoteAttributeValue($s)
    {
        $quotedString = $this->collapseWhitespace($s);
        $quotedString = preg_replace('/\\\\/', '\\\\\\\\', $quotedString);
        $quotedString = preg_replace('/\\;/', '\\;', $quotedString);
        $quotedString = preg_replace('/\\)/', '\\)', $quotedString);

        return $quotedString;
    }

    // Private API ------------------------------------------------------------//

    /**
     * Invoke request and return response
     * @param array $parameters
     * @return array
     * @throws Exception
     * @throws FBAInboundServiceMWS_Exception
     */
    private function _invoke(array $parameters)
    {
        try {
            if (empty($this->_config['ServiceURL'])) {
                throw new FBAInboundServiceMWS_Exception(array(
                    'ErrorCode' => 'InvalidServiceURL',
                    'Message' => "Missing serviceUrl configuration value. You may obtain a list of valid MWS URLs by consulting the MWS Developer's Guide, or reviewing the sample code published along side this library."
                ));
            }
            $parameters = $this->_addRequiredParameters($parameters);
            $retries = 0;
            for (; ;) {
                $response = $this->_httpPost($parameters);
                $status = (int) $response['Status'];
                if ($status === 200) {
                    return array(
                        'ResponseBody' => $response['ResponseBody'],
                        'ResponseHeaderMetadata' => $response['ResponseHeaderMetadata']
                    );
                }
                if ($status === 500 && $this->_pauseOnRetry(++$retries)) {
                    continue;
                }
                throw $this->_reportAnyErrors($response['ResponseBody'], $status, $response['ResponseHeaderMetadata']);
            }
        } catch(FBAInboundServiceMWS_Exception $se) {
            throw $se;
        } catch(Exception $t) {
            throw new FBAInboundServiceMWS_Exception(array('Exception' => $t, 'Message' => $t->getMessage()));
        }
    }

    /**
     * Look for additional error strings in the response and return formatted exception
     * @param $responseBody
     * @param $status
     * @param $responseHeaderMetadata
     * @param Exception $e
     * @return FBAInboundServiceMWS_Exception
     */
    private function _reportAnyErrors($responseBody, $status, $responseHeaderMetadata, Exception $e = null)
    {
        $exProps = array();
        $exProps["StatusCode"] = $status;
        $exProps["ResponseHeaderMetadata"] = $responseHeaderMetadata;

        libxml_use_internal_errors(true);  // Silence XML parsing errors
        $xmlBody = simplexml_load_string($responseBody);

        if ($xmlBody !== false) {  // Check XML loaded without errors
            $exProps["XML"] = $responseBody;
            $exProps["ErrorCode"] = $xmlBody->Error->Code;
            $exProps["Message"] = $xmlBody->Error->Message;
            $exProps["ErrorType"] = !empty($xmlBody->Error->Type) ? $xmlBody->Error->Type : "Unknown";
            $exProps["RequestId"] = !empty($xmlBody->RequestID) ? $xmlBody->RequestID : $xmlBody->RequestId; // 'd' in RequestId is sometimes capitalized
        } else { // We got bad XML in response, just throw a generic exception
            $exProps["Message"] = "Internal Error";
        }

        return new FBAInboundServiceMWS_Exception($exProps);
    }

    /**
     * Perform HTTP post with exponential retries on error 500 and 503
     * @param array $parameters
     * @return array
     * @throws FBAInboundServiceMWS_Exception
     */
    private function _httpPost(array $parameters)
    {
        $config = $this->_config;
        $query = $this->_getParametersAsString($parameters);
        $url = parse_url($config['ServiceURL']);
        $uri = array_key_exists('path', $url) ? $url['path'] : null;
        if (!isset ($uri)) {
            $uri = "/";
        }

        switch ($url['scheme']) {
            case 'https':
                $scheme = 'https://';
                $port = isset($url['port']) ? $url['port'] : 443;
                break;
            default:
                $scheme = 'http://';
                $port = isset($url['port']) ? $url['port'] : 80;
        }

        $allHeaders = $config['Headers'];
        $allHeaders['Content-Type'] = "application/x-www-form-urlencoded; charset=utf-8"; // We need to make sure to set utf-8 encoding here
        $allHeaders['Expect'] = null; // Don't expect 100 Continue
        $allHeadersStr = array();
        foreach ($allHeaders as $name => $val) {
            $str = $name . ": ";
            if (isset($val)) {
                $str = $str . $val;
            }
            $allHeadersStr[] = $str;
        }

        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $scheme . $url['host'] . $uri);
        curl_setopt($ch, CURLOPT_PORT, $port);
        $this->setSSLCurlOptions($ch);
        curl_setopt($ch, CURLOPT_USERAGENT, $this->_config['UserAgent']);
        curl_setopt($ch, CURLOPT_POST, true);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $query);
        curl_setopt($ch, CURLOPT_HTTPHEADER, $allHeadersStr);
        curl_setopt($ch, CURLOPT_HEADER, true);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        if ($config['ProxyHost'] != null && $config['ProxyPort'] != -1) {
            curl_setopt($ch, CURLOPT_PROXY, $config['ProxyHost'] . ':' . $config['ProxyPort']);
        }

        $response = curl_exec($ch);

        if ($response === false) {
            $exProps["Message"] = curl_error($ch);
            $exProps["ErrorType"] = "HTTP";
            curl_close($ch);
            throw new FBAInboundServiceMWS_Exception($exProps);
        }

        curl_close($ch);
        return $this->_extractHeadersAndBody($response);
    }

    /**
     * This method will attempt to extract the headers and body of our response.
     * We need to split the raw response string by 2 'CRLF's.  2 'CRLF's should indicate the separation of the response header
     * from the response body.  However in our case we have some circumstances (certain client proxies) that result in
     * multiple responses concatenated.  We could encounter a response like
     *
     * HTTP/1.1 100 Continue
     *
     * HTTP/1.1 200 OK
     * Date: Tue, 01 Apr 2014 13:02:51 GMT
     * Content-Type: text/html; charset=iso-8859-1
     * Content-Length: 12605
     *
     * ... body ..
     *
     * This method will throw away extra response status lines and attempt to find the first full response headers and body
     *
     * return [status, body, ResponseHeaderMetadata]
     * @param $response
     * @return array
     * @throws FBAInboundServiceMWS_Exception
     */
    private function _extractHeadersAndBody($response)
    {
        //First split by 2 'CRLF'
        $responseComponents = preg_split("/(?:\r?\n){2}/", $response, 2);
        $body = null;
        $responseStatus = null;
        $responseHeaderMetadata = null;
        for ($count = 0; $count < count($responseComponents) && $body == null; $count++) {

            $headers = $responseComponents[$count];
            $responseStatus = $this->_extractHttpStatusCode($headers);

            if ($responseStatus != null && $this->_httpHeadersHaveContent($headers)) {
                $responseHeaderMetadata = $this->_extractResponseHeaderMetadata($headers);
                //The body will be the next item in the responseComponents array
                $body = $responseComponents[++$count];
            }
        }

        //If the body is null here then we were unable to parse the response and will throw an exception
        if ($body == null) {
            $exProps["Message"] = "Failed to parse valid HTTP response (" . $response . ")";
            $exProps["ErrorType"] = "HTTP";
            throw new FBAInboundServiceMWS_Exception($exProps);
        }

        return array(
            'Status' => $responseStatus,
            'ResponseBody' => $body,
            'ResponseHeaderMetadata' => $responseHeaderMetadata
        );
    }

    /**
     * parse the status line of a header string for the proper format and
     * return the status code
     *
     * Example: HTTP/1.1 200 OK
     * ...
     * returns String statusCode or null if the status line can't be parsed
     * @param $headers
     * @return null
     */
    private function _extractHttpStatusCode($headers)
    {
        $statusCode = null;
        if (1 === preg_match("/(\\S+) +(\\d+) +([^\n\r]+)(?:\r?\n|\r)/", $headers, $matches)) {
            //The matches array [entireMatchString, protocol, statusCode, the rest]
            $statusCode = $matches[2];
        }
        return $statusCode;
    }

    /**
     * Tries to determine some valid headers indicating this response
     * has content.  In this case
     * return true if there is a valid "Content-Length" or "Transfer-Encoding" header
     * @param $headers
     * @return bool
     */
    private function _httpHeadersHaveContent($headers)
    {
        return (1 === preg_match("/[cC]ontent-[lL]ength: +(?:\\d+)(?:\\r?\\n|\\r|$)/",
                $headers) || 1 === preg_match("/Transfer-Encoding: +(?!identity[\r\n;= ])(?:[^\r\n]+)(?:\r?\n|\r|$)/i",
                $headers));
    }

    /**
     *  extract a ResponseHeaderMetadata object from the raw headers
     * @param $rawHeaders
     * @return FBAInboundServiceMWS_Model_ResponseHeaderMetadata
     */
    private function _extractResponseHeaderMetadata($rawHeaders)
    {
        $inputHeaders = preg_split("/\r\n|\n|\r/", $rawHeaders);
        $headers = array();
        $headers['x-mws-request-id'] = null;
        $headers['x-mws-response-context'] = null;
        $headers['x-mws-timestamp'] = null;
        $headers['x-mws-quota-max'] = null;
        $headers['x-mws-quota-remaining'] = null;
        $headers['x-mws-quota-resetsOn'] = null;

        foreach ($inputHeaders as $currentHeader) {
            $keyValue = explode(': ', $currentHeader);
            if (isset($keyValue[1])) {
                list ($key, $value) = $keyValue;
                if (isset($headers[$key]) && $headers[$key] !== null) {
                    $headers[$key] = $headers[$key] . "," . $value;
                } else {
                    $headers[$key] = $value;
                }
            }
        }

        return new FBAInboundServiceMWS_Model_ResponseHeaderMetadata($headers['x-mws-request-id'],
            $headers['x-mws-response-context'], $headers['x-mws-timestamp'], $headers['x-mws-quota-max'],
            $headers['x-mws-quota-remaining'], $headers['x-mws-quota-resetsOn']);
    }

    /**
     * Set curl options relating to SSL. Protected to allow overriding.
     * @param $ch resource curl handle
     */
    protected function setSSLCurlOptions($ch)
    {
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, $this->_config['SSL_VerifyPeer']);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, $this->_config['SSL_VerifyHost']);
    }

    /**
     * Exponential sleep on failed request
     *
     * @param int $retries current retry
     * @return bool
     */
    private function _pauseOnRetry($retries)
    {
        if ($retries <= $this->_config['MaxErrorRetry']) {
            $delay = (int)(pow(4, $retries) * 100000);
            usleep($delay);
            return true;
        }
        return false;
    }

    /**
     * Add authentication related and version parameters
     * @param array $parameters
     * @return array
     * @throws Exception
     */
    private function _addRequiredParameters(array $parameters)
    {
        $parameters['AWSAccessKeyId'] = $this->_awsAccessKeyId;
        $parameters['Timestamp'] = $this->_getFormattedTimestamp();
        $parameters['Version'] = self::SERVICE_VERSION;
        $parameters['SignatureVersion'] = $this->_config['SignatureVersion'];
        if ($parameters['SignatureVersion'] > 1) {
            $parameters['SignatureMethod'] = $this->_config['SignatureMethod'];
        }
        $parameters['Signature'] = $this->_signParameters($parameters, $this->_awsSecretAccessKey);

        return $parameters;
    }

    /**
     * Convert paremeters to Url encoded query string
     * @param array $parameters
     * @return string
     */
    private function _getParametersAsString(array $parameters)
    {
        $queryParameters = array();
        foreach ($parameters as $key => $value) {
            $queryParameters[] = $key . '=' . $this->_urlencode($value);
        }
        return implode('&', $queryParameters);
    }

    /**
     * Computes RFC 2104-compliant HMAC signature for request parameters
     * Implements AWS Signature, as per following spec:
     *
     * If Signature Version is 0, it signs concatenated Action and Timestamp
     *
     * If Signature Version is 1, it performs the following:
     *
     * Sorts all  parameters (including SignatureVersion and excluding Signature,
     * the value of which is being created), ignoring case.
     *
     * Iterate over the sorted list and append the parameter name (in original case)
     * and then its value. It will not URL-encode the parameter values before
     * constructing this string. There are no separators.
     *
     * If Signature Version is 2, string to sign is based on following:
     *
     *    1. The HTTP Request Method followed by an ASCII newline (%0A)
     *    2. The HTTP Host header in the form of lowercase host, followed by an ASCII newline.
     *    3. The URL encoded HTTP absolute path component of the URI
     *       (up to but not including the query string parameters);
     *       if this is empty use a forward '/'. This parameter is followed by an ASCII newline.
     *    4. The concatenation of all query string components (names and values)
     *       as UTF-8 characters which are URL encoded as per RFC 3986
     *       (hex characters MUST be uppercase), sorted using lexicographic byte ordering.
     *       Parameter names are separated from their values by the '=' character
     *       (ASCII character 61), even if the value is empty.
     *       Pairs of parameter and values are separated by the '&' character (ASCII code 38).
     * @param array $parameters
     * @param $key
     * @return string
     * @throws Exception
     */
    private function _signParameters(array $parameters, $key)
    {
        $signatureVersion = $parameters['SignatureVersion'];
        $stringToSign = null;
        if (2 === $signatureVersion) {
            $algorithm = $this->_config['SignatureMethod'];
            $parameters['SignatureMethod'] = $algorithm;
            $stringToSign = $this->_calculateStringToSignV2($parameters);
        } else {
            throw new Exception("Invalid Signature Version specified");
        }
        return $this->_sign($stringToSign, $key, $algorithm);
    }

    /**
     * Calculate String to Sign for SignatureVersion 2
     * @param array $parameters request parameters
     * @return String to Sign
     */
    private function _calculateStringToSignV2(array $parameters)
    {
        $data = 'POST';
        $data .= "\n";
        $endpoint = parse_url($this->_config['ServiceURL']);
        $data .= $endpoint['host'];
        $data .= "\n";
        $uri = array_key_exists('path', $endpoint) ? $endpoint['path'] : null;
        if (!isset ($uri)) {
            $uri = "/";
        }
        $uriencoded = implode("/", array_map(array($this, "_urlencode"), explode("/", $uri)));
        $data .= $uriencoded;
        $data .= "\n";
        uksort($parameters, 'strcmp');
        $data .= $this->_getParametersAsString($parameters);
        return $data;
    }

    private function _urlencode($value)
    {
        return str_replace('%7E', '~', rawurlencode($value));
    }

    /**
     * Computes RFC 2104-compliant HMAC signature.
     * @param $data
     * @param $key
     * @param $algorithm
     * @return string
     * @throws Exception
     */
    private function _sign($data, $key, $algorithm)
    {
        if ($algorithm === 'HmacSHA1') {
            $hash = 'sha1';
        } else if ($algorithm === 'HmacSHA256') {
            $hash = 'sha256';
        } else {
            throw new Exception ("Non-supported signing method specified");
        }
        return base64_encode(hash_hmac($hash, $data, $key, true));
    }

    /**
     * Formats date as ISO 8601 timestamp
     */
    private function _getFormattedTimestamp()
    {
        return gmdate("Y-m-d\\TH:i:s.\\0\\0\\0\\Z", time());
    }
}


<?php
/*******************************************************************************
 * Copyright 2009-2014 Amazon Services. All Rights Reserved.
 * Licensed under the Apache License, Version 2.0 (the "License");
 *
 * You may not use this file except in compliance with the License.
 * You may obtain a copy of the License at: http://aws.amazon.com/apache2.0
 * This file is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
 * CONDITIONS OF ANY KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations under the License.
 *******************************************************************************
 * PHP Version 5
 * @category Amazon
 * @package  FBA Inventory Service MWS
 * @version  2010-10-01
 * Library Version: 2014-10-20
 * Generated: Fri Oct 17 17:54:00 GMT 2014
 */

/**
 * FBAInventoryServiceMWS_Client is an implementation of FBAInventoryServiceMWS
 *
 */
class FBAInventoryServiceMWS_Client implements FBAInventoryServiceMWS_Interface
{

    const SERVICE_VERSION = '2010-10-01';
    const MWS_CLIENT_VERSION = '2014-10-20';

    /** @var string */
    private $_awsAccessKeyId = null;

    /** @var string */
    private $_awsSecretAccessKey = null;

    /** @var array */
    private $_config = array(
        'ServiceURL' => null,
        'UserAgent' => 'FBAInventoryServiceMWS PHP5 Library',
        'SignatureVersion' => 2,
        'SignatureMethod' => 'HmacSHA256',
        'ProxyHost' => null,
        'ProxyPort' => -1,
        'ProxyUsername' => null,
        'ProxyPassword' => null,
        'MaxErrorRetry' => 3,
        'Headers' => array(),
        'SSL_VerifyPeer' => true,
        'SSL_VerifyHost' => 2,
    );

    /** @var string */
    private $_serviceVersion;

    /**
     * Get Service Status
     * Gets the status of the service.
     *     Status is one of GREEN, RED representing:
     *     GREEN: The service section is operating normally.
     *     RED: The service section disruption.
     *
     * @param mixed $request array of parameters for FBAInventoryServiceMWS_Model_GetServiceStatus request or FBAInventoryServiceMWS_Model_GetServiceStatus object itself
     * @see FBAInventoryServiceMWS_Model_GetServiceStatusRequest
     * @return FBAInventoryServiceMWS_Model_GetServiceStatusResponse
     *
     * @throws FBAInventoryServiceMWS_Exception
     */
    public function getServiceStatus($request)
    {
        if (!($request instanceof FBAInventoryServiceMWS_Model_GetServiceStatusRequest)) {
            $request = new FBAInventoryServiceMWS_Model_GetServiceStatusRequest($request);
        }
        $parameters = $request->toQueryParameterArray();
        $parameters['Action'] = 'GetServiceStatus';
        $httpResponse = $this->_invoke($parameters);

        $response = FBAInventoryServiceMWS_Model_GetServiceStatusResponse::fromXML($httpResponse['ResponseBody']);
        $response->setResponseHeaderMetadata($httpResponse['ResponseHeaderMetadata']);
        return $response;
    }

    /**
     * List Inventory Supply
     * Get information about the supply of seller-owned inventory in
     *     Amazon's fulfillment network. "Supply" is inventory that is available
     *     for fulfilling (a.k.a. Multi-Channel Fulfillment) orders. In general
     *     this includes all sellable inventory that has been received by Amazon,
     *     that is not reserved for existing orders or for internal FC processes,
     *     and also inventory expected to be received from inbound shipments.
     *
     *     This operation provides 2 typical usages by setting different
     *     ListInventorySupplyRequest value:
     *
     *     1. Set value to SellerSkus and not set value to QueryStartDateTime,
     *     this operation will return all sellable inventory that has been received
     *     by Amazon's fulfillment network for these SellerSkus.
     *
     *     2. Not set value to SellerSkus and set value to QueryStartDateTime,
     *     This operation will return information about the supply of all seller-owned
     *     inventory in Amazon's fulfillment network, for inventory items that may have had
     *     recent changes in inventory levels. It provides the most efficient mechanism
     *     for clients to maintain local copies of inventory supply data.
     *
     *     Only 1 of these 2 parameters (SellerSkus and QueryStartDateTime) can be set value for 1 request.
     *     If both with values or neither with values, an exception will be thrown.
     *
     *     This operation is used with ListInventorySupplyByNextToken
     *     to paginate over the resultset. Begin pagination by invoking the
     *     ListInventorySupply operation, and retrieve the first set of
     *     results. If more results are available,continuing iteratively requesting further
     *     pages results by invoking the ListInventorySupplyByNextToken operation (each time
     *     passing in the NextToken value from the previous result), until the returned NextToken
     *     is null, indicating no further results are available.
     *
     * @param mixed $request array of parameters for FBAInventoryServiceMWS_Model_ListInventorySupply request or FBAInventoryServiceMWS_Model_ListInventorySupply object itself
     * @see FBAInventoryServiceMWS_Model_ListInventorySupplyRequest
     * @return FBAInventoryServiceMWS_Model_ListInventorySupplyResponse
     *
     * @throws FBAInventoryServiceMWS_Exception
     */
    public function listInventorySupply($request)
    {
        if (!($request instanceof FBAInventoryServiceMWS_Model_ListInventorySupplyRequest)) {
            $request = new FBAInventoryServiceMWS_Model_ListInventorySupplyRequest($request);
        }
        $parameters = $request->toQueryParameterArray();
        $parameters['Action'] = 'ListInventorySupply';
        $httpResponse = $this->_invoke($parameters);

        $response = FBAInventoryServiceMWS_Model_ListInventorySupplyResponse::fromXML($httpResponse['ResponseBody']);
        $response->setResponseHeaderMetadata($httpResponse['ResponseHeaderMetadata']);
        return $response;
    }

    /**
     * List Inventory Supply By Next Token
     * Continues pagination over a resultset of inventory data for inventory
     *     items.
     *
     *     This operation is used in conjunction with ListUpdatedInventorySupply.
     *     Please refer to documentation for that operation for further details.
     *
     * @param mixed $request array of parameters for FBAInventoryServiceMWS_Model_ListInventorySupplyByNextToken request or FBAInventoryServiceMWS_Model_ListInventorySupplyByNextToken object itself
     * @see FBAInventoryServiceMWS_Model_ListInventorySupplyByNextTokenRequest
     * @return FBAInventoryServiceMWS_Model_ListInventorySupplyByNextTokenResponse
     *
     * @throws FBAInventoryServiceMWS_Exception
     */
    public function listInventorySupplyByNextToken($request)
    {
        if (!($request instanceof FBAInventoryServiceMWS_Model_ListInventorySupplyByNextTokenRequest)) {
            $request = new FBAInventoryServiceMWS_Model_ListInventorySupplyByNextTokenRequest($request);
        }
        $parameters = $request->toQueryParameterArray();
        $parameters['Action'] = 'ListInventorySupplyByNextToken';
        $httpResponse = $this->_invoke($parameters);

        $response = FBAInventoryServiceMWS_Model_ListInventorySupplyByNextTokenResponse::fromXML($httpResponse['ResponseBody']);
        $response->setResponseHeaderMetadata($httpResponse['ResponseHeaderMetadata']);
        return $response;
    }

    /**
     * Construct new Client
     *
     * @param string $awsAccessKeyId AWS Access Key ID
     * @param string $awsSecretAccessKey AWS Secret Access Key
     * @param array $config configuration options.
     * Valid configuration options are:
     *

     *
ServiceURL

     *
UserAgent

     *
SignatureVersion

     *
TimesRetryOnError

     *
ProxyHost

     *
ProxyPort

     *
ProxyUsername

     *
ProxyPassword

     *
MaxErrorRetry

     *

     * @param $applicationName
     * @param $applicationVersion
     * @param null $attributes
     */
    public function __construct(
        $awsAccessKeyId,
        $awsSecretAccessKey,
        $config,
        $applicationName,
        $applicationVersion,
        $attributes = null
    ) {
        if(version_compare(PHP_VERSION, '5.6.0', '<')) {
            iconv_set_encoding('output_encoding', 'UTF-8');
            iconv_set_encoding('input_encoding', 'UTF-8');
            iconv_set_encoding('internal_encoding', 'UTF-8');
        }

        $this->_awsAccessKeyId = $awsAccessKeyId;
        $this->_awsSecretAccessKey = $awsSecretAccessKey;
        $this->_serviceVersion = $applicationVersion;
        if (!is_null($config)) {
            $this->_config = array_merge($this->_config, $config);
        }
        $this->setUserAgentHeader($applicationName, $applicationVersion, $attributes);
    }

    public function setUserAgentHeader(
        $applicationName,
        $applicationVersion,
        $attributes = null
    ) {

        if (is_null($attributes)) {
            $attributes = array();
        }

        $this->_config['UserAgent'] = $this->constructUserAgentHeader($applicationName, $applicationVersion,
            $attributes);
    }

    private function constructUserAgentHeader($applicationName, $applicationVersion, $attributes = null)
    {
        if (is_null($applicationName) || $applicationName === "") {
            throw new InvalidArgumentException('$applicationName cannot be null');
        }

        if (is_null($applicationVersion) || $applicationVersion === "") {
            throw new InvalidArgumentException('$applicationVersion cannot be null');
        }

        $userAgent = $this->quoteApplicationName($applicationName) . '/' . $this->quoteApplicationVersion($applicationVersion);

        $userAgent .= ' (';
        $userAgent .= 'Language=PHP/' . phpversion();
        $userAgent .= '; ';
        $userAgent .= 'Platform=' . php_uname('s') . '/' . php_uname('m') . '/' . php_uname('r');
        $userAgent .= '; ';
        $userAgent .= 'MWSClientVersion=' . self::MWS_CLIENT_VERSION;

        foreach ($attributes as $key => $value) {
            if (empty($value)) {
                throw new InvalidArgumentException("Value for $key cannot be null or empty.");
            }

            $userAgent .= '; ' . $this->quoteAttributeName($key) . '=' . $this->quoteAttributeValue($value);
        }

        $userAgent .= ')';

        return $userAgent;
    }

    /**
     * Collapse multiple whitespace characters into a single ' ' character.
     * @param $s
     * @return string
     */
    private function collapseWhitespace($s)
    {
        return preg_replace('/ {2,}|\s/', ' ', $s);
    }

    /**
     * Collapse multiple whitespace characters into a single ' ' and backslash escape '\',
     * and '/' characters from a string.
     * @param $s
     * @return string
     */
    private function quoteApplicationName($s)
    {
        $quotedString = $this->collapseWhitespace($s);
        $quotedString = preg_replace('/\\\\/', '\\\\\\\\', $quotedString);
        $quotedString = preg_replace('/\//', '\\/', $quotedString);

        return $quotedString;
    }

    /**
     * Collapse multiple whitespace characters into a single ' ' and backslash escape '\',
     * and '(' characters from a string.
     *
     * @param $s
     * @return string
     */
    private function quoteApplicationVersion($s)
    {
        $quotedString = $this->collapseWhitespace($s);
        $quotedString = preg_replace('/\\\\/', '\\\\\\\\', $quotedString);
        $quotedString = preg_replace('/\\(/', '\\(', $quotedString);

        return $quotedString;
    }

    /**
     * Collapse multiple whitespace characters into a single ' ' and backslash escape '\',
     * and '=' characters from a string.
     *
     * @param string $s
     * @return string
     */
    private function quoteAttributeName($s)
    {
        $quotedString = $this->collapseWhitespace($s);
        $quotedString = preg_replace('/\\\\/', '\\\\\\\\', $quotedString);
        $quotedString = preg_replace('/\\=/', '\\=', $quotedString);

        return $quotedString;
    }

    /**
     * Collapse multiple whitespace characters into a single ' ' and backslash escape ';', '\',
     * and ')' characters from a string.
     *
     * @param string $s
     * @return string
     */
    private function quoteAttributeValue($s)
    {
        $quotedString = $this->collapseWhitespace($s);
        $quotedString = preg_replace('/\\\\/', '\\\\\\\\', $quotedString);
        $quotedString = preg_replace('/\\;/', '\\;', $quotedString);
        $quotedString = preg_replace('/\\)/', '\\)', $quotedString);

        return $quotedString;
    }

    // Private API ------------------------------------------------------------//

    /**
     * Invoke request and return response
     * @param array $parameters
     * @return array
     * @throws Exception
     * @throws FBAInventoryServiceMWS_Exception
     */
    private function _invoke(array $parameters)
    {
        try {
            if (empty($this->_config['ServiceURL'])) {
                throw new FBAInventoryServiceMWS_Exception(array(
                    'ErrorCode' => 'InvalidServiceURL',
                    'Message' => "Missing serviceUrl configuration value. You may obtain a list of valid MWS URLs by consulting the MWS Developer's Guide, or reviewing the sample code published along side this library."
                ));
            }
            $parameters = $this->_addRequiredParameters($parameters);
            $retries = 0;
            for (; ;) {
                $response = $this->_httpPost($parameters);
                $status = (int) $response['Status'];
                if ($status == 200) {
                    return array(
                        'ResponseBody' => $response['ResponseBody'],
                        'ResponseHeaderMetadata' => $response['ResponseHeaderMetadata']
                    );
                }
                if ($status == 500 && $this->_pauseOnRetry(++$retries)) {
                    continue;
                }
                throw $this->_reportAnyErrors($response['ResponseBody'], $status, $response['ResponseHeaderMetadata']);
            }
        } catch(FBAInventoryServiceMWS_Exception $se) {
            throw $se;
        } catch(Exception $t) {
            throw new FBAInventoryServiceMWS_Exception(array('Exception' => $t, 'Message' => $t->getMessage()));
        }
    }

    /**
     * Look for additional error strings in the response and return formatted exception
     * @param $responseBody
     * @param $status
     * @param $responseHeaderMetadata
     * @param Exception $e
     * @return FBAInventoryServiceMWS_Exception
     */
    private function _reportAnyErrors($responseBody, $status, $responseHeaderMetadata, Exception $e = null)
    {
        $exProps = array();
        $exProps["StatusCode"] = $status;
        $exProps["ResponseHeaderMetadata"] = $responseHeaderMetadata;

        libxml_use_internal_errors(true);  // Silence XML parsing errors
        $xmlBody = simplexml_load_string($responseBody);

        if ($xmlBody !== false) {  // Check XML loaded without errors
            $exProps["XML"] = $responseBody;
            $exProps["ErrorCode"] = $xmlBody->Error->Code;
            $exProps["Message"] = $xmlBody->Error->Message;
            $exProps["ErrorType"] = !empty($xmlBody->Error->Type) ? $xmlBody->Error->Type : "Unknown";
            $exProps["RequestId"] = !empty($xmlBody->RequestID) ? $xmlBody->RequestID : $xmlBody->RequestId; // 'd' in RequestId is sometimes capitalized
        } else { // We got bad XML in response, just throw a generic exception
            $exProps["Message"] = "Internal Error";
        }

        return new FBAInventoryServiceMWS_Exception($exProps);
    }

    /**
     * Perform HTTP post with exponential retries on error 500 and 503
     * @param array $parameters
     * @return array
     * @throws FBAInventoryServiceMWS_Exception
     */
    private function _httpPost(array $parameters)
    {
        $config = $this->_config;
        $query = $this->_getParametersAsString($parameters);
        $url = parse_url($config['ServiceURL']);
        $uri = array_key_exists('path', $url) ? $url['path'] : null;
        if (!isset ($uri)) {
            $uri = "/";
        }

        switch ($url['scheme']) {
            case 'https':
                $scheme = 'https://';
                $port = isset($url['port']) ? $url['port'] : 443;
                break;
            default:
                $scheme = 'http://';
                $port = isset($url['port']) ? $url['port'] : 80;
        }

        $allHeaders = $config['Headers'];
        $allHeaders['Content-Type'] = "application/x-www-form-urlencoded; charset=utf-8"; // We need to make sure to set utf-8 encoding here
        $allHeaders['Expect'] = null; // Don't expect 100 Continue
        $allHeadersStr = array();
        foreach ($allHeaders as $name => $val) {
            $str = $name . ": ";
            if (isset($val)) {
                $str = $str . $val;
            }
            $allHeadersStr[] = $str;
        }

        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $scheme . $url['host'] . $uri);
        curl_setopt($ch, CURLOPT_PORT, $port);
        $this->setSSLCurlOptions($ch);
        curl_setopt($ch, CURLOPT_USERAGENT, $this->_config['UserAgent']);
        curl_setopt($ch, CURLOPT_POST, true);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $query);
        curl_setopt($ch, CURLOPT_HTTPHEADER, $allHeadersStr);
        curl_setopt($ch, CURLOPT_HEADER, true);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        if ($config['ProxyHost'] != null && $config['ProxyPort'] != -1) {
            curl_setopt($ch, CURLOPT_PROXY, $config['ProxyHost'] . ':' . $config['ProxyPort']);
        }
        if ($config['ProxyUsername'] != null && $config['ProxyPassword'] != null) {
            curl_setopt($ch, CURLOPT_PROXYUSERPWD, $config['ProxyUsername'] . ':' . $config['ProxyPassword']);
        }

        $response = curl_exec($ch);

        if ($response === false) {
            $exProps["Message"] = curl_error($ch);
            $exProps["ErrorType"] = "HTTP";
            curl_close($ch);
            throw new FBAInventoryServiceMWS_Exception($exProps);
        }

        curl_close($ch);
        return $this->_extractHeadersAndBody($response);
    }

    /**
     * This method will attempt to extract the headers and body of our response.
     * We need to split the raw response string by 2 'CRLF's.  2 'CRLF's should indicate the separation of the response header
     * from the response body.  However in our case we have some circumstances (certain client proxies) that result in
     * multiple responses concatenated.  We could encounter a response like
     *
     * HTTP/1.1 100 Continue
     *
     * HTTP/1.1 200 OK
     * Date: Tue, 01 Apr 2014 13:02:51 GMT
     * Content-Type: text/html; charset=iso-8859-1
     * Content-Length: 12605
     *
     * ... body ..
     *
     * This method will throw away extra response status lines and attempt to find the first full response headers and body
     *
     * return [status, body, ResponseHeaderMetadata]
     * @param $response
     * @return array
     * @throws FBAInventoryServiceMWS_Exception
     */
    private function _extractHeadersAndBody($response)
    {
        //First split by 2 'CRLF'
        $responseComponents = preg_split("/(?:\r?\n){2}/", $response, 2);
        $body = null;
        for ($count = 0; $count < count($responseComponents) && $body == null; $count++) {

            $headers = $responseComponents[$count];
            $responseStatus = $this->_extractHttpStatusCode($headers);

            if ($responseStatus != null && $this->_httpHeadersHaveContent($headers)) {

                $responseHeaderMetadata = $this->_extractResponseHeaderMetadata($headers);
                //The body will be the next item in the responseComponents array
                $body = $responseComponents[++$count];
            }
        }

        //If the body is null here then we were unable to parse the response and will throw an exception
        if ($body == null) {
            $exProps["Message"] = "Failed to parse valid HTTP response (" . $response . ")";
            $exProps["ErrorType"] = "HTTP";
            throw new FBAInventoryServiceMWS_Exception($exProps);
        }

        return array(
            'Status' => $responseStatus,
            'ResponseBody' => $body,
            'ResponseHeaderMetadata' => $responseHeaderMetadata
        );
    }

    /**
     * parse the status line of a header string for the proper format and
     * return the status code
     *
     * Example: HTTP/1.1 200 OK
     * ...
     * returns String statusCode or null if the status line can't be parsed
     * @param $headers
     * @return null
     */
    private function _extractHttpStatusCode($headers)
    {
        $statusCode = null;
        if (1 === preg_match("/(\\S+) +(\\d+) +([^\n\r]+)(?:\r?\n|\r)/", $headers, $matches)) {
            //The matches array [entireMatchString, protocol, statusCode, the rest]
            $statusCode = $matches[2];
        }
        return $statusCode;
    }

    /**
     * Tries to determine some valid headers indicating this response
     * has content.  In this case
     * return true if there is a valid "Content-Length" or "Transfer-Encoding" header
     * @param $headers
     * @return bool
     */
    private function _httpHeadersHaveContent($headers)
    {
        return (1 === preg_match("/[cC]ontent-[lL]ength: +(?:\\d+)(?:\\r?\\n|\\r|$)/",
                $headers) || 1 === preg_match("/Transfer-Encoding: +(?!identity[\r\n;= ])(?:[^\r\n]+)(?:\r?\n|\r|$)/i",
                $headers));
    }

    /**
     *  extract a ResponseHeaderMetadata object from the raw headers
     * @param $rawHeaders
     * @return FBAInventoryServiceMWS_Model_ResponseHeaderMetadata
     */
    private function _extractResponseHeaderMetadata($rawHeaders)
    {
        $inputHeaders = preg_split("/\r\n|\n|\r/", $rawHeaders);
        $headers = array();
        $headers['x-mws-request-id'] = null;
        $headers['x-mws-response-context'] = null;
        $headers['x-mws-timestamp'] = null;
        $headers['x-mws-quota-max'] = null;
        $headers['x-mws-quota-remaining'] = null;
        $headers['x-mws-quota-resetsOn'] = null;

        foreach ($inputHeaders as $currentHeader) {
            $keyValue = explode(': ', $currentHeader);
            if (isset($keyValue[1])) {
                list ($key, $value) = $keyValue;
                if (isset($headers[$key]) && $headers[$key] !== null) {
                    $headers[$key] = $headers[$key] . "," . $value;
                } else {
                    $headers[$key] = $value;
                }
            }
        }

        return new FBAInventoryServiceMWS_Model_ResponseHeaderMetadata($headers['x-mws-request-id'],
            $headers['x-mws-response-context'], $headers['x-mws-timestamp'], $headers['x-mws-quota-max'],
            $headers['x-mws-quota-remaining'], $headers['x-mws-quota-resetsOn']);
    }

    /**
     * Set curl options relating to SSL. Protected to allow overriding.
     * @param $ch resource curl handle
     */
    protected function setSSLCurlOptions($ch)
    {
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, $this->_config['SSL_VerifyPeer']);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, $this->_config['SSL_VerifyHost']);
    }

    /**
     * Exponential sleep on failed request
     *
     * @param int $retries current retry
     * @return bool
     */
    private function _pauseOnRetry($retries)
    {
        if ($retries <= $this->_config['MaxErrorRetry']) {
            $delay = (int)(pow(4, $retries) * 100000);
            usleep($delay);
            return true;
        }
        return false;
    }

    /**
     * Add authentication related and version parameters
     * @param array $parameters
     * @return array
     * @throws Exception
     */
    private function _addRequiredParameters(array $parameters)
    {
        $parameters['AWSAccessKeyId'] = $this->_awsAccessKeyId;
        $parameters['Timestamp'] = $this->_getFormattedTimestamp();
        $parameters['Version'] = self::SERVICE_VERSION;
        $parameters['SignatureVersion'] = $this->_config['SignatureVersion'];
        if ($parameters['SignatureVersion'] > 1) {
            $parameters['SignatureMethod'] = $this->_config['SignatureMethod'];
        }
        $parameters['Signature'] = $this->_signParameters($parameters, $this->_awsSecretAccessKey);

        return $parameters;
    }

    /**
     * Convert paremeters to Url encoded query string
     * @param array $parameters
     * @return string
     */
    private function _getParametersAsString(array $parameters)
    {
        $queryParameters = array();
        foreach ($parameters as $key => $value) {
            $queryParameters[] = $key . '=' . $this->_urlencode($value);
        }
        return implode('&', $queryParameters);
    }

    /**
     * Computes RFC 2104-compliant HMAC signature for request parameters
     * Implements AWS Signature, as per following spec:
     *
     * If Signature Version is 0, it signs concatenated Action and Timestamp
     *
     * If Signature Version is 1, it performs the following:
     *
     * Sorts all  parameters (including SignatureVersion and excluding Signature,
     * the value of which is being created), ignoring case.
     *
     * Iterate over the sorted list and append the parameter name (in original case)
     * and then its value. It will not URL-encode the parameter values before
     * constructing this string. There are no separators.
     *
     * If Signature Version is 2, string to sign is based on following:
     *
     *    1. The HTTP Request Method followed by an ASCII newline (%0A)
     *    2. The HTTP Host header in the form of lowercase host, followed by an ASCII newline.
     *    3. The URL encoded HTTP absolute path component of the URI
     *       (up to but not including the query string parameters);
     *       if this is empty use a forward '/'. This parameter is followed by an ASCII newline.
     *    4. The concatenation of all query string components (names and values)
     *       as UTF-8 characters which are URL encoded as per RFC 3986
     *       (hex characters MUST be uppercase), sorted using lexicographic byte ordering.
     *       Parameter names are separated from their values by the '=' character
     *       (ASCII character 61), even if the value is empty.
     *       Pairs of parameter and values are separated by the '&' character (ASCII code 38).
     * @param array $parameters
     * @param $key
     * @return string
     * @throws Exception
     */
    private function _signParameters(array $parameters, $key)
    {
        $signatureVersion = $parameters['SignatureVersion'];
        $stringToSign = null;
        if (2 == $signatureVersion) {
            $algorithm = $this->_config['SignatureMethod'];
            $parameters['SignatureMethod'] = $algorithm;
            $stringToSign = $this->_calculateStringToSignV2($parameters);
        } else {
            throw new Exception("Invalid Signature Version specified");
        }
        return $this->_sign($stringToSign, $key, $algorithm);
    }

    /**
     * Calculate String to Sign for SignatureVersion 2
     * @param array $parameters request parameters
     * @return String to Sign
     */
    private function _calculateStringToSignV2(array $parameters)
    {
        $data = 'POST';
        $data .= "\n";
        $endpoint = parse_url($this->_config['ServiceURL']);
        $data .= $endpoint['host'];
        $data .= "\n";
        $uri = array_key_exists('path', $endpoint) ? $endpoint['path'] : null;
        if (!isset ($uri)) {
            $uri = "/";
        }
        $uriencoded = implode("/", array_map(array($this, "_urlencode"), explode("/", $uri)));
        $data .= $uriencoded;
        $data .= "\n";
        uksort($parameters, 'strcmp');
        $data .= $this->_getParametersAsString($parameters);
        return $data;
    }

    private function _urlencode($value)
    {
        return str_replace('%7E', '~', rawurlencode($value));
    }

    /**
     * Computes RFC 2104-compliant HMAC signature.
     * @param $data
     * @param $key
     * @param $algorithm
     * @return string
     * @throws Exception
     */
    private function _sign($data, $key, $algorithm)
    {
        if ($algorithm === 'HmacSHA1') {
            $hash = 'sha1';
        } else if ($algorithm === 'HmacSHA256') {
            $hash = 'sha256';
        } else {
            throw new Exception ("Non-supported signing method specified");
        }
        return base64_encode(hash_hmac($hash, $data, $key, true));
    }

    /**
     * Formats date as ISO 8601 timestamp
     */
    private function _getFormattedTimestamp()
    {
        return gmdate("Y-m-d\\TH:i:s.\\0\\0\\0\\Z", time());
    }
}