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aptajoshaptajosh
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Source Code for Client side app to that enables wcf service that allows to call scanner from web browser
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‎src/CORS.Enabled/CORS.Enabled.csproj‎

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<?xml version="1.0" encoding="utf-8"?>
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<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
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<Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
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<PropertyGroup>
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<Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
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<Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
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<ProjectGuid>{CD47E419-3765-44DE-B403-7B48D4B0FDFA}</ProjectGuid>
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<OutputType>Library</OutputType>
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<AppDesignerFolder>Properties</AppDesignerFolder>
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<RootNamespace>CORS.Enabled</RootNamespace>
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<AssemblyName>CORS.Enabled</AssemblyName>
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<TargetFrameworkVersion>v4.5.2</TargetFrameworkVersion>
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<FileAlignment>512</FileAlignment>
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</PropertyGroup>
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<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
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<DebugSymbols>true</DebugSymbols>
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<DebugType>full</DebugType>
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<Optimize>false</Optimize>
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<OutputPath>bin\Debug\</OutputPath>
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<DefineConstants>DEBUG;TRACE</DefineConstants>
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<ErrorReport>prompt</ErrorReport>
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<WarningLevel>4</WarningLevel>
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</PropertyGroup>
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<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
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<DebugType>pdbonly</DebugType>
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<Optimize>true</Optimize>
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<OutputPath>bin\Release\</OutputPath>
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<DefineConstants>TRACE</DefineConstants>
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<ErrorReport>prompt</ErrorReport>
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<WarningLevel>4</WarningLevel>
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</PropertyGroup>
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<ItemGroup>
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<Reference Include="System" />
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<Reference Include="System.Core" />
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<Reference Include="System.ServiceModel" />
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<Reference Include="System.ServiceModel.Activation" />
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<Reference Include="System.ServiceModel.Web" />
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<Reference Include="System.Xml.Linq" />
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<Reference Include="System.Data.DataSetExtensions" />
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<Reference Include="Microsoft.CSharp" />
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<Reference Include="System.Data" />
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<Reference Include="System.Net.Http" />
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<Reference Include="System.Xml" />
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</ItemGroup>
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<ItemGroup>
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<Compile Include="CorsConstants.cs" />
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<Compile Include="CorsEnabledAttribute.cs" />
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<Compile Include="CorsEnabledMessageInspector.cs" />
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<Compile Include="CorsEnabledServiceHostFactory.cs" />
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<Compile Include="EnableCorsEndpointBehavior.cs" />
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<Compile Include="PreflightOperationBehavior.cs" />
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<Compile Include="PreflightOperationInvoker.cs" />
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<Compile Include="Properties\AssemblyInfo.cs" />
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</ItemGroup>
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<Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
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</Project>

‎src/CORS.Enabled/CORS.Enabled.csproj.user‎

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<?xml version="1.0" encoding="utf-8"?>
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<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
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<PropertyGroup>
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<ProjectView>ShowAllFiles</ProjectView>
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</PropertyGroup>
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</Project>

‎src/CORS.Enabled/CorsConstants.cs‎

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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace CorsEnabledService
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{
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class CorsConstants
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{
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internal const string Origin = "Origin";
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internal const string AccessControlAllowOrigin = "Access-Control-Allow-Origin";
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internal const string AccessControlRequestMethod = "Access-Control-Request-Method";
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internal const string AccessControlRequestHeaders = "Access-Control-Request-Headers";
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internal const string AccessControlAllowMethods = "Access-Control-Allow-Methods";
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internal const string AccessControlAllowHeaders = "Access-Control-Allow-Headers";
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internal const string PreflightSuffix = "_preflight_";
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}
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}

‎src/CORS.Enabled/CorsEnabledAttribute.cs‎

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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.ServiceModel.Channels;
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using System.ServiceModel.Description;
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using System.ServiceModel.Dispatcher;
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using System.Text;
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using System.Threading.Tasks;
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namespace CorsEnabledService
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{
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public class CorsEnabledAttribute : Attribute, IOperationBehavior
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{
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public void AddBindingParameters(OperationDescription operationDescription, BindingParameterCollection bindingParameters)
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{
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}
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public void ApplyClientBehavior(OperationDescription operationDescription, ClientOperation clientOperation)
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{
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}
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public void ApplyDispatchBehavior(OperationDescription operationDescription, DispatchOperation dispatchOperation)
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{
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}
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public void Validate(OperationDescription operationDescription)
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{
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}
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}
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}

‎src/CORS.Enabled/CorsEnabledMessageInspector.cs‎

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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.ServiceModel;
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using System.ServiceModel.Channels;
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using System.ServiceModel.Description;
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using System.ServiceModel.Dispatcher;
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using System.Text;
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using System.Threading.Tasks;
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namespace CorsEnabledService
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{
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class CorsEnabledMessageInspector : IDispatchMessageInspector
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{
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private List<string> corsEnabledOperationNames;
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public CorsEnabledMessageInspector(List<OperationDescription> corsEnabledOperations)
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{
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this.corsEnabledOperationNames = corsEnabledOperations.Select(o => o.Name).ToList();
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}
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public object AfterReceiveRequest(ref Message request, IClientChannel channel, InstanceContext instanceContext)
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{
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HttpRequestMessageProperty httpProp = (HttpRequestMessageProperty)request.Properties[HttpRequestMessageProperty.Name];
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object operationName;
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request.Properties.TryGetValue(WebHttpDispatchOperationSelector.HttpOperationNamePropertyName, out operationName);
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if (httpProp != null && operationName != null && this.corsEnabledOperationNames.Contains((string)operationName))
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{
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string origin = httpProp.Headers[CorsConstants.Origin];
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if (origin != null)
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{
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return origin;
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}
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}
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return null;
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}
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public void BeforeSendReply(ref Message reply, object correlationState)
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{
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string origin = correlationState as string;
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if (origin != null)
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{
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HttpResponseMessageProperty httpProp = null;
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if (reply.Properties.ContainsKey(HttpResponseMessageProperty.Name))
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{
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httpProp = (HttpResponseMessageProperty)reply.Properties[HttpResponseMessageProperty.Name];
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}
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else
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{
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httpProp = new HttpResponseMessageProperty();
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reply.Properties.Add(HttpResponseMessageProperty.Name, httpProp);
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}
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httpProp.Headers.Add(CorsConstants.AccessControlAllowOrigin, origin);
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}
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}
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}
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}

‎src/CORS.Enabled/CorsEnabledServiceHostFactory.cs‎

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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.ServiceModel;
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using System.ServiceModel.Activation;
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using System.ServiceModel.Channels;
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using System.ServiceModel.Description;
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using System.ServiceModel.Web;
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using System.Text;
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using System.Threading.Tasks;
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namespace CorsEnabledService
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{
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public class CorsEnabledServiceHostFactory : ServiceHostFactory
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{
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protected override ServiceHost CreateServiceHost(Type serviceType, Uri[] baseAddresses)
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{
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return new CorsEnabledServiceHost(serviceType, baseAddresses);
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}
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}
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public class CorsEnabledServiceHost : ServiceHost
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{
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Type contractType;
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public CorsEnabledServiceHost(Type serviceType, params Uri[] baseAddresses)
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: base(serviceType, baseAddresses)
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{
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this.contractType = GetContractType(serviceType);
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}
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protected override void OnOpening()
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{
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ServiceEndpoint endpoint = this.AddServiceEndpoint(this.contractType, new WebHttpBinding(), "");
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List<OperationDescription> corsEnabledOperations = endpoint.Contract.Operations
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.Where(o => o.Behaviors.Find<CorsEnabledAttribute>() != null)
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.ToList();
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AddPreflightOperations(endpoint, corsEnabledOperations);
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var webHttpBheavior = new WebHttpBehavior();
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webHttpBheavior.HelpEnabled = true;
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endpoint.Behaviors.Add(webHttpBheavior);
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endpoint.Behaviors.Add(new EnableCorsEndpointBehavior());
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base.OnOpening();
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}
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private Type GetContractType(Type serviceType)
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{
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if (HasServiceContract(serviceType))
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{
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return serviceType;
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}
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Type[] possibleContractTypes = serviceType.GetInterfaces()
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.Where(i => HasServiceContract(i))
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.ToArray();
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switch (possibleContractTypes.Length)
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{
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case 0:
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throw new InvalidOperationException("Service type " + serviceType.FullName + " does not implement any interface decorated with the ServiceContractAttribute.");
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case 1:
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return possibleContractTypes[0];
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default:
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throw new InvalidOperationException("Service type " + serviceType.FullName + " implements multiple interfaces decorated with the ServiceContractAttribute, not supported by this factory.");
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}
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}
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private static bool HasServiceContract(Type type)
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{
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return Attribute.IsDefined(type, typeof(ServiceContractAttribute), false);
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}
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private void AddPreflightOperations(ServiceEndpoint endpoint, List<OperationDescription> corsOperations)
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{
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Dictionary<string, PreflightOperationBehavior> uriTemplates = new Dictionary<string, PreflightOperationBehavior>(StringComparer.OrdinalIgnoreCase);
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foreach (var operation in corsOperations)
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{
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if (operation.Behaviors.Find<WebGetAttribute>() != null)
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{
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// no need to add preflight operation for GET requests
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continue;
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}
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if (operation.IsOneWay)
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{
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// no support for 1-way messages
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continue;
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}
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string originalUriTemplate;
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WebInvokeAttribute originalWia = operation.Behaviors.Find<WebInvokeAttribute>();
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if (originalWia != null && originalWia.UriTemplate != null)
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{
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originalUriTemplate = NormalizeTemplate(originalWia.UriTemplate);
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}
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else
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{
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originalUriTemplate = operation.Name;
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}
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string originalMethod = originalWia != null && originalWia.Method != null ? originalWia.Method : "POST";
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if (uriTemplates.ContainsKey(originalUriTemplate))
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{
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// there is already an OPTIONS operation for this URI, we can reuse it
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PreflightOperationBehavior operationBehavior = uriTemplates[originalUriTemplate];
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operationBehavior.AddAllowedMethod(originalMethod);
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}
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else
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{
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ContractDescription contract = operation.DeclaringContract;
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OperationDescription preflightOperation = new OperationDescription(operation.Name + CorsConstants.PreflightSuffix, contract);
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MessageDescription inputMessage = new MessageDescription(operation.Messages[0].Action + CorsConstants.PreflightSuffix, MessageDirection.Input);
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inputMessage.Body.Parts.Add(new MessagePartDescription("input", contract.Namespace) { Index = 0, Type = typeof(Message) });
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preflightOperation.Messages.Add(inputMessage);
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MessageDescription outputMessage = new MessageDescription(operation.Messages[1].Action + CorsConstants.PreflightSuffix, MessageDirection.Output);
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outputMessage.Body.ReturnValue = new MessagePartDescription(preflightOperation.Name + "Return", contract.Namespace) { Type = typeof(Message) };
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preflightOperation.Messages.Add(outputMessage);
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WebInvokeAttribute wia = new WebInvokeAttribute();
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wia.UriTemplate = originalUriTemplate;
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wia.Method = "OPTIONS";
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preflightOperation.Behaviors.Add(wia);
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preflightOperation.Behaviors.Add(new DataContractSerializerOperationBehavior(preflightOperation));
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PreflightOperationBehavior preflightOperationBehavior = new PreflightOperationBehavior(preflightOperation);
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preflightOperationBehavior.AddAllowedMethod(originalMethod);
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preflightOperation.Behaviors.Add(preflightOperationBehavior);
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uriTemplates.Add(originalUriTemplate, preflightOperationBehavior);
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contract.Operations.Add(preflightOperation);
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}
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}
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}
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private string NormalizeTemplate(string uriTemplate)
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{
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int queryIndex = uriTemplate.IndexOf('?');
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if (queryIndex >= 0)
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{
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// no query string used for this
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uriTemplate = uriTemplate.Substring(0, queryIndex);
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}
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int paramIndex;
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while ((paramIndex = uriTemplate.IndexOf('{')) >= 0)
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{
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// Replacing all named parameters with wildcards
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int endParamIndex = uriTemplate.IndexOf('}', paramIndex);
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if (endParamIndex >= 0)
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{
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uriTemplate = uriTemplate.Substring(0, paramIndex) + '*' + uriTemplate.Substring(endParamIndex + 1);
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}
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}
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return uriTemplate;
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}
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}
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}

‎src/CORS.Enabled/EnableCorsEndpointBehavior.cs‎

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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.ServiceModel.Channels;
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using System.ServiceModel.Description;
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using System.ServiceModel.Dispatcher;
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using System.Text;
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using System.Threading.Tasks;
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namespace CorsEnabledService
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{
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class EnableCorsEndpointBehavior : IEndpointBehavior
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{
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public void AddBindingParameters(ServiceEndpoint endpoint, BindingParameterCollection bindingParameters)
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{
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}
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public void ApplyClientBehavior(ServiceEndpoint endpoint, ClientRuntime clientRuntime)
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{
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}
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public void ApplyDispatchBehavior(ServiceEndpoint endpoint, EndpointDispatcher endpointDispatcher)
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{
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List<OperationDescription> corsEnabledOperations = endpoint.Contract.Operations
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.Where(o => o.Behaviors.Find<CorsEnabledAttribute>() != null)
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.ToList();
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endpointDispatcher.DispatchRuntime.MessageInspectors.Add(new CorsEnabledMessageInspector(corsEnabledOperations));
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}
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public void Validate(ServiceEndpoint endpoint)
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{
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}
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}
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}

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