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If you get rid of the wrapper elements by setting ParameterStyle to Bare, you are saying that serialized method parameters should appear as direct children of <Body> When you combine both settings (RountingStyle=RequestElement and ParameterStyle=Bare) you end up with an interesting dilemma: Each Web method must have exactly one parameter and that parameter must have a unique serialized name among all other Web method parameters For example, you can t have two methods, GetTemperature and GetWeather, both with a parameter that gets serialized to an element named ZipCode To see why this makes sense, consider the following request message: <soap:Body> <ZipCode xmlns="http://wwwlearnxmlwscom/WeatherService ">20171</ZipCode> </soap:Body> Is this a request for the GetTemperature or GetWeather web method If both methods have one parameter named ZipCode then there s no way to tell which method the client intended to invoke Therefore, each method must have exactly one parameter and the serialized parameter must have a unique name The LogOn method has two parameters: User id and password so it can t use Bare parameter style and RequestElement routing style together I could replace the user id and password with a structure or a class that has two public members called UserId and Password and make LogOn accept an object of this class But that would make it a little less convenient for a NET client as they would have to instantiate an object and set its members then pass it to LogOn as opposed to just calling LogOn and passing it the UserId and password directly I decided to keep things simple for NET clients so I chose to use the default ParameterStyle which is wrapped This is a design decision and there s no absolute right or wrong so your choice could very well be different from mine
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At this point, we have the core Web service operations implemented and working However, there s still a lot of work to be done We must secure the Web service so that only registered users with the appropriate permissions can access each of the methods We must also modify the standard, auto-generated, documentation page to inform users that registration is required and give them a link to the registration page We also need to implement a usage tracking system so that we can monitor the usage for each user and, possibly, bill for that usage As you can see, a typical Web service requires substantial infrastructure Instead of building security and usage accounting from scratch we will simply use the infrastructure SOAP extensions from chapter 10 To reuse the infrastructure SOAP extension from chapter 10, you first need to add a reference to infrastructuredll (the assembly that contains the SOAP extensions) You then add an Import statement for the namespace LearnXmlWSWebServicesInfrastructure as shown in listing 13-5 Listing 13-5 Adding SoapHeader attribute to GetTemperature and GetWeather as part of implementing authorization (VBWSBook\13\Weatherasmxvb)
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Imports SystemWebServices Imports SystemWebServicesProtocols Imports SystemXmlSerialization
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Imports LearnXmlWSWebServicesInfrastructure <SoapDocumentService( _ RoutingStyle:=SoapServiceRoutingStyleRequestElement), _ WebService(Namespace:="http://wwwlearnxmlwscom/WeatherService"), _ WebServiceBindingAttribute("WeatherInterface", _ "http://wwwlearnxmlwscom/WeatherService ")> _ Imports LearnXmlWSWebServicesInfrastructure Public Class Weather Inherits SystemWebServicesWebService
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'The session id Public sessHdr As SessionHeader <WebMethod(), _ SoapDocumentMethod( _ Binding:="WeatherInterface", _ Action:="", _ ParameterStyle:=SoapParameterStyleBare), _ SoapHeader("sessHdr", _ Required:=True, Direction:=SoapHeaderDirectionIn)> _ Public Function GetTemperature( _ <XmlElement("TemperatureRequest")> ByVal ZipCode As String) _ As <XmlElement("Temperature")> Single Return WeatherInfoGetTemperatureFromZip(ZipCode) End Function
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<WebMethod(), _ SoapDocumentMethod( _ Binding:="WeatherInterface", _
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Action:="", _ ParameterStyle:=SoapParameterStyleBare), _ SoapSecurity("Weather"), _ SoapHeader("sessHdr", _ Required:=True, Direction:=SoapHeaderDirectionIn)> _ Public Function GetWeather( _ <XmlElement("WeatherRequest")> ByVal ZipCode As String) _ As <XmlElement("CurrentWeather")> CurrentWeather Return WeatherInfoGetWeatherFromZip(ZipCode) End Function End Class
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Recall that the security SOAP extension relies on a SOAP header of type SessionHeader So you will need to add a public variable to your Web service class The variable is sessHdr and its type is SessionHeader as shown in listing 13-5 Next, you need to add the SoapHeader attribute to both GetTemperature and GetWeather methods and specify that it is a required attribute and its direction is In To apply authorization, you need to add the SoapSecurity attribute to each method and pass its constructor the required permission to execute that method You can make up those permissions as long as they match what s in the UserPermissions database table (see chapter 10 for more information about the database schema used for authentication and authorization)
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