SOAP-ERROR: Parsing WSDL: Unknown required WSDL extension 'http://schemas.xmlsoap.org/ws/2004/09/policy' in PHP SoapClient while calling SAP PI

Question

I\'m trying to implement a Web Service running on an SAP PI system. The WSDL I got looks like this:

Answer 1

This isn't really the correct answer in a SAP environment. In your URL for the WSDL, you'll see /ws_policy/ - change this to /standard/ and you'll be able to use the PHP SoapClient class to consume the web service without having to maintain a local modified copy of the WSDL. You can see the same on a SAP blog here (login probably required).

Answer 2

The only solution I can think of at this point is to update your UsingPolicy tag:

Change the tag:

<wsp:UsingPolicy wsdl:required="true"/> 

to this:

<wsp:UsingPolicy wsdl:required="false"/>

Answer 3

Seems to be a bug in PHP SOAPServer, or a missing extension compatibility, and it hasn't been solved yet, at least in PHP 5.6.31.

The only solution I could find was to set required UsingPolicy to false, as suggested in the accepted response:

<wsp:UsingPolicy wsdl:required="false" />

But clients could access the SOAP service without authentication, which is a serious security issue. So, I tried to manually check that the security data is sent by the client.

$soapEnvelope = new DOMDocument();
$soapEnvelope->loadXML(file_get_contents("php://input"), LIBXML_DTDATTR);
$wsseNamespace = "http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd";

if ($soapEnvelope->getElementsByTagNameNS($wsseNamespace, 'Security')->length == 0) {
    throw new SoapFault("auth", 'Authentication error - Missing wsse:Security node');
}

if ($soapEnvelope->getElementsByTagNameNS($wsseNamespace, 'UsernameToken')->length == 0) {
    throw new SoapFault("auth", 'Authentication error - Missing UsernameToken node');
}

if ($soapEnvelope->getElementsByTagNameNS($wsseNamespace, 'Username')->length == 0) {
    throw new SoapFault("auth", 'Authentication error - Missing Username node');
}

if ($soapEnvelope->getElementsByTagNameNS($wsseNamespace, 'Password')->length == 0) {
    throw new SoapFault("auth", 'Authentication error - Missing Password node');
}

// SOAPServer handle requests method
$server->handle();

It's a dirt trick, but it works.

Answer 4

For new versions the URL is not containing anymore the "ws_policy" instead there is a 0 (standard)or 1 (policy)

Example:

....wsdl/flv_10002A111AD1/bndg_url/.... (ws_policy)

....wsdl/flv_10002A101AD1/bndg_url/.... (standard)

Credits to Rafa Martinez