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requestHandler.php
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requestHandler.php
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<?php
require_once './functions.php';
require_once './IsbnService.php';
require_once './IsbnServiceJson.php';
require_once './My_MySQLi.php';
/**
* requestHandler for metadataProxy:
*
* The entered data is validated. If valid ISBN, the data is checked against local storage (mysql).
* If ISBN is stored locally, the local data is returend (JSON), otherwise,
* data is searched on WorldCat through OCLC webservice.
* If found and valid data, it is stored locally and returned, otherwise,
* the data status is returned only (invalidId if invalid ISBN, unknownID if ISBN not found on WorldCat).
*
* @author K.Heim
*/
//Prevalidate (stripslashes etc.)
$prevalidatedIsbn = preValidate($_POST["isbn"]);
try {
//Validate ISBN:
if (validateIsbn($prevalidatedIsbn)) {
//check local data:
$result = checkMySQL($prevalidatedIsbn);
//local data found:
if (isset ($result)) {
echo $result;
return;
} else {
try {
//get data from OCLC webservice:
$resultString = getMetadatafromOclc($prevalidatedIsbn);
//if OCLC returns data:
if (isset($resultString)) {
$statOK = '"stat":"ok"';
if (strpos($resultString, $statOK)) {
//store result locally
insertMetadataintoDB($prevalidatedIsbn, $resultString);
}
echo $resultString;
return;
}
} catch (Exception $ex) {
//oclc returns nothing or is unavailable
echo 'requestHandler: Exception: oclc returns nothing.';
return;
}
}
}
} catch (Exception $ex) {
//error message
echo "requestHandler: ISBN Validation error!";
}