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When creating the consumer with Visual Studio, the consumer-side proxy class is created automatically for
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CslaCredentials, thus dramatically simplifying the process of providing the data. You ll see an example of this
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later in the chapter.
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SoapHeader Attribute
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With the SoapHeader class and corresponding field defined, any consumer that references the web service will have a clearly defined structure into which the username and password values can be placed. By default, web methods don t require SOAP headers. The [SoapHeader()] attribute is applied to a web method to indicate that it does require a specific SOAP header. This attribute accepts a parameter that links the SOAP header to a specific SoapHeader field declared in the web service class; in this case, to the Credentials field of type CslaCredentials. This means that any web methods requiring authentication will be declared like this: [WebMethod(Description="A sample method")] [SoapHeader("Credentials")] public void SampleMethod() { // Web method implementation code goes here } When this method is invoked by a consumer, the .NET runtime uses reflection to find a field called Credentials. It then uses reflection against that Credentials field to discover its type. Based on that type information, it looks at the SOAP header data to find the SOAP header that matches that type, and takes the appropriate data out of the SOAP header and uses it to populate the field. This SOAP XML might look something like this (the CslaCredentials header is displayed in bold): POST /PTservice/projecttracker.asmx HTTP/1.1 Host: localhost Content-Type: text/xml; charset=utf-8 Content-Length: 574 SOAPAction: "http://ws.lhotka.net/PTWebService/ProjectTracker/GetResourceList" < xml version="1.0" encoding="utf-8" > <soap:Envelope xmlns:xsi=http://www.w3.org/2001/XMLSchema-instance xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"> <soap:Header> <CslaCredentials xmlns="http://ws.lhotka.net/PTWebService/ProjectTracker"> <Username>string</Username>
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CHAPTER 11 s WEB SERVICES INTERFACE
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<Password>string</Password> </CslaCredentials> </soap:Header> <soap:Body> <GetResourceList xmlns="http://ws.lhotka.net/PTWebService/ProjectTracker" /> </soap:Body> </soap:Envelope> That data is used to create a CslaCredentials object, which is provided to PTService through the Credentials field. Then the web method itself is called.
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that the [SoapHeader()] attribute indicates a required SOAP header, so the web method can only be called by a consumer that provides this information.
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This means that by the time the web method code is running, the Credentials field will be loaded with the username and password values provided by the consumer, via the SOAP header.
Validating the Credentials
At this point, you should understand how to require a consumer to provide a username and a password, and how to make those values available to your web service code through a field declared in the web service class. Given this information, it is now possible to use the username and password values to authenticate the caller by using PTPrincipal.Login(). This method was discussed in 8. It validates the caller s credentials and sets the current principal object to the resulting PTPrincipal. Since this code is running inside ASP.NET, Csla.ApplicationContext sets the HttpContext.Current.User property with this value. As with the PTWeb interface in 10, it is also important to set the User property from the current HttpContext. Though the business objects and most of the .NET Framework rely on the Thread object to get the current principal, most web-related code relies on HttpContext.Current. User instead. Setting both values ensures that all code will use the same principal object. The Security class in the App_Code directory contains a Login() helper method to take care of the details: public static void Login(CslaCredentials credentials) { if (string.IsNullOrEmpty(credentials.Username)) throw new System.Security.SecurityException( "Valid credentials not provided"); // set to unauthenticated principal PTPrincipal.Logout(); PTPrincipal.Login(credentials.Username, credentials.Password); if (!Csla.ApplicationContext.User.Identity.IsAuthenticated) { // the user is not valid, raise an error throw new System.Security.SecurityException( "Invalid user or password"); } }
CHAPTER 11 s WEB SERVICES INTERFACE
This method accepts the CslaCredentials object created by .NET and uses its values to call PTPrincipal.Login(). If the credentials are valid, then the current principal is set to use the new principal object. Otherwise, an exception is thrown to notify the caller that their credentials were invalid. All of this work ensures that only valid, authenticated users gain access to the web methods, provided that those methods have the following structure: [WebMethod(Description="A sample method")] [SoapHeader("Credentials")] public void SampleMethod() { // user credentials required. Security.Login(Credentials); // Web method implementation code goes here } Web methods that don t require authentication simply don t use the [SoapHeader()] attribute or call Security.Login(). Instead they call a different method: Security.UseAnonymous(): public static void UseAnonymous() { ProjectTracker.Library.Security.PTPrincipal.Logout(); } Remember from 8 that PTPrincipal.Logout() sets the current principal value to an unauthenticated PTPrincipal. A remote data portal will only accept a principal object that inherits from Csla.Security.BusinessPrincipalBase, and so this code ensures that the current principal is such a principal object. With the authentication scheme covered, let s move on to discuss the implementation of actual web methods.
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