EWS Push Subscription using PHP - php

Question

Does anyone know how to respond to EWS (Exchange Web Services) Push Notifications using PHP.
I have initiated the EWS Push Subscription but cannot seem to send the correct SOAP response (in order to keep the subscription alive) when EWS sends my service a SOAP notification.
Taken from this page, I was under the impression that my SOAP response should be as follows:
<s:Envelope xmlns:s= "http://schemas.xmlsoap.org/soap/envelope/">
<s:Body>
<SendNotificationResult xmlns="http://schemas.microsoft.com/exchange/services/2006/messages">
<SubscriptionStatus>OK</SubscriptionStatus>
</SendNotificationResult>
</s:Body>
</s:Envelope>
However, EWS doesn't seem to be accepting my response as valid.
I have tried the following 2 code snippets with no luck:
Respond using a SOAP string with Content-Type header
header( 'Content-Type: text/xml; charset=utf-8' );
echo '<?xml version="1.0" encoding="utf-8"?>'.
'<s:Envelope xmlns:s= "http://schemas.xmlsoap.org/soap/envelope/">'.
'<s:Body>'.
'<SendNotificationResult xmlns="http://schemas.microsoft.com/exchange/services/2006/messages">'.
'<SubscriptionStatus>OK</SubscriptionStatus>'.
'</SendNotificationResult>'.
'</s:Body>'.
'</s:Envelope>';
OR Respond using a SOAP service
class ewsService {
public function SendNotification( $arg ) {
$result = new EWSType_SendNotificationResultType();
$result->SubscriptionStatus = 'OK';
return $result;
}
}
$server = new SoapServer( null, array(
'uri' => $_SERVER['REQUEST_SCHEME'].'://'.$_SERVER['HTTP_HOST'].$_SERVER['PHP_SELF'],
));
$server->setObject( new ewsService() );
$server->handle();
It might help to know that the classes I am using in my code come from the PHP-EWS library.
Any help would be greatly appreciated.
I also posted a more specific question here, but have had no responses so thought I would ask whether someone has actually gotten this working using any method.

Answer 1

It would seem that I was close but needed to include the NotificationService.wsdl when instantiating the SoapServer class. The WSDL then allows that SoapServer class to format the response accordingly.
$server = new SoapServer( PHPEWS_PATH.'/wsdl/NotificationService.wsdl', array(
The WSDL was not included in the php-ews library download, however it is included with the Exchange Server installation. If like me you don't have access to the Exchange Server installation you can find the file here. I also had to add the following to the end of the WSDL because I was storing the WSDLs locally and not using autodiscovery:
<wsdl:service name="NotificationServices">
<wsdl:port name="NotificationServicePort" binding="tns:NotificationServiceBinding">
<soap:address location="" />
</wsdl:port>
</wsdl:service>
So the full working PHP code is as follows:
class ewsService {
public function SendNotification( $arg ) {
$result = new EWSType_SendNotificationResultType();
$result->SubscriptionStatus = 'OK';
//$result->SubscriptionStatus = 'Unsubscribe';
return $result;
}
}
$server = new SoapServer( PHPEWS_PATH.'/wsdl/NotificationService.wsdl', array(
'uri' => $_SERVER['REQUEST_SCHEME'].'://'.$_SERVER['HTTP_HOST'].$_SERVER['PHP_SELF'],
));
$server->setObject( $service = new ewsService() );
$server->handle();
Which gives the following output:
<?xml version="1.0" encoding="UTF-8"?>
<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ns1="http://schemas.microsoft.com/exchange/services/2006/messages">
<SOAP-ENV:Body>
<ns1:SendNotificationResult>
<ns1:SubscriptionStatus>OK</ns1:SubscriptionStatus>
</ns1:SendNotificationResult>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>
Hope that helps someone else because that took me a while to figure out!