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using System;
using System.Collections.Generic;
using System.IdentityModel.Policy;
using System.Linq;
using System.Security.Principal;
using System.ServiceModel;
using System.ServiceModel.Channels;
using System.ServiceModel.Security;
using DotNetOpenAuth;
using DotNetOpenAuth.OAuth;
/// <summary>
/// A WCF extension to authenticate incoming messages using OAuth.
/// </summary>
public class OAuthAuthorizationManager : ServiceAuthorizationManager {
public OAuthAuthorizationManager() {
}
protected override bool CheckAccessCore(OperationContext operationContext) {
if (!base.CheckAccessCore(operationContext)) {
return false;
}
HttpRequestMessageProperty httpDetails = operationContext.RequestContext.RequestMessage.Properties[HttpRequestMessageProperty.Name] as HttpRequestMessageProperty;
Uri requestUri = operationContext.RequestContext.RequestMessage.Properties["OriginalHttpRequestUri"] as Uri;
ServiceProvider sp = Constants.CreateServiceProvider();
try {
var auth = sp.ReadProtectedResourceAuthorization(httpDetails, requestUri);
if (auth != null) {
var accessToken = Global.DataContext.OAuthTokens.Single(token => token.Token == auth.AccessToken);
var principal = sp.CreatePrincipal(auth);
var policy = new OAuthPrincipalAuthorizationPolicy(principal);
var policies = new List<IAuthorizationPolicy> {
policy,
};
var securityContext = new ServiceSecurityContext(policies.AsReadOnly());
if (operationContext.IncomingMessageProperties.Security != null) {
operationContext.IncomingMessageProperties.Security.ServiceSecurityContext = securityContext;
} else {
operationContext.IncomingMessageProperties.Security = new SecurityMessageProperty {
ServiceSecurityContext = securityContext,
};
}
securityContext.AuthorizationContext.Properties["Identities"] = new List<IIdentity> {
principal.Identity,
};
// Only allow this method call if the access token scope permits it.
string[] scopes = accessToken.Scope.Split('|');
if (scopes.Contains(operationContext.IncomingMessageHeaders.Action)) {
return true;
}
}
} catch (ProtocolException ex) {
Global.Logger.Error("Error processing OAuth messages.", ex);
}
return false;
}
}
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