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The whole SOAP request code is enclosed in a try block. If the SOAP request fails, it throws an exception of the SoapFault type, which we transform into an error using the trigger_error() function. Read more on the SOAP exception at http://www.php.net/manual/ en/function.is-soap-fault.php. The result of the SOAP request is an object containing the requested data. If you load test_soap.php in your browser (don t forget to put your Access Key ID in it), it should display the data in a text format that s not easy to read by the human eye. The code starts by creating a SOAP client object to the Amazon SOAP Web Service: // Initialize SOAP client object $client = new SoapClient( 'http://webservices.amazon.com/AWSECommerceService/AWSECommerceService.wsdl'); The referenced WSDL (Web Services Definition Language) file describes all the functions and their parameters types that Amazon SOAP server understands. The earlier created Amazon SOAP client object knows about all these functions, and you can call them now using something like this: $result = $client->ItemSearch($request); Alternatively, you can make the exact same call, and implicitly obtain the same results, by using the __soapCall function (http://www.php.net/manual/en/function. soap-soapclient-soapcall.php), like this: $result->__soapCall('ItemSearch', array ($request)); The Web Service request does an ItemSearch operation on the super+hats keywords in the Apparel store. The whole request is placed in a try-catch block that catches any potential exceptions and generates an error. Read more on the SoapFault exception class, which contains the details of the SOAP error, at http://www.php.net/manual/en/function. is-soap-fault.php. Loading test_soap.php would generate the result shown in Figure 17-6.
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Figure 17-6. The results of the SOAP request
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Integrating Amazon E-Commerce Service with HatShop
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The goal is to bring some books related to super hats from Amazon to your store. You ll build a special department with no categories that will display some book info (cover image, title, authors, and price). Each book will have a Buy from Amazon link that allows your visitor to buy the book from Amazon.com. If you apply for an Amazon Associates ID account, you ll get a small commission from this. After following the exercises, you ll implement the Amazon integration as shown earlier in Figure 17-1. The following link engages a REST search for Amazon Books on the super hats keywords and returns the first ten products data sorted by their sales rank: http://webservices.amazon.com/onca/xml Service=AWSECommerceService &Operation=ItemSearch &AWSAccessKeyId=[Your Access Key ID] &Keywords=super+hat
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&SearchIndex=Apparel &ResponseGroup=Request%2CMedium%2CImages%2COffers&Sort=salesrank From these products, we will place on our site only the ones available for purchase and with cover images.
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Implementing the Business Tier
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In the business tier, you ll add the code that accesses the ECS system.
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Exercise: Adding ECS Communication Code to the Business Tier
1. Add the following code in your include/config.php file: // Amazon E-Commerce Service // define('AMAZON_METHOD', 'REST'); define('AMAZON_METHOD', 'SOAP'); define('AMAZON_WSDL', 'http://webservices.amazon.com/AWSECommerceService/AWSECommerceService.wsdl'); define('AMAZON_REST_BASE_URL', 'http://webservices.amazon.com/onca/xml Service=AWSECommerceService'); // Set Amazon Access Key ID define('AMAZON_ACCESS_KEY_ID', '[Your Access Key ID]'); // Set Amazon Associates ID define('AMAZON_ASSOCIATES_ID', '[Your amazon associates ID]'); // Set Amazon request options define('AMAZON_SEARCH_KEYWORDS', 'super hat'); define('AMAZON_SEARCH_NODE', 'Apparel'); define('AMAZON_RESPONSE_GROUPS', 'Request,Medium'); 2. Create a new file named amazon.php in the business folder, and add the following code to it. The single public method, which will be called from the upper tiers, is GetProducts, whereas the others are private methods for internal use that support the functionality of GetProducts. < php // Class for accessing ECS class Amazon { public function Amazon() { } // Retrieves Amazon products for sending to presentation tier public function GetProducts() {
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// Use SOAP to get data if (AMAZON_METHOD == 'SOAP') $result = $this->GetDataWithSoap(); // Use REST to get data else $result = $this->GetDataWithRest(); // Initializes Array object $results = array (); // Format results $results = $this->DataFormat($result); // Returns results return $results; } // Call ECS using REST private function GetDataWithRest() { $params = array ('Operation' 'SubscriptionId' 'Keywords' 'SearchIndex' 'ResponseGroup' 'Sort'
=> => => => => =>
'ItemSearch', AMAZON_ACCESS_KEY_ID, AMAZON_SEARCH_KEYWORDS, AMAZON_SEARCH_NODE, AMAZON_RESPONSE_GROUPS, 'salesrank');
$query_string = '&'; foreach ($params as $key => $value) $query_string .= $key . '=' . urlencode($value) . '&'; $amazon_url = AMAZON_REST_BASE_URL . $query_string; // Get the XML response using REST $amazon_xml = file_get_contents($amazon_url); // Unserialize the XML and return return simplexml_load_string($amazon_xml); } // Call ECS using SOAP private function GetDataWithSoap() { try { $client = new SoapClient(AMAZON_WSDL);
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