/// <summary>Preauthenticates a request.</summary>
/// <returns>An instance of the <see cref="T:System.Net.Authorization" /> class if the request can be preauthenticated; otherwise, null. If <paramref name="credentials" /> is null, this method returns null.</returns>
/// <param name="request">A <see cref="T:System.Net.WebRequest" /> to an Internet resource. </param>
/// <param name="credentials">The <see cref="T:System.Net.ICredentials" /> associated with the request. </param>
/// <exception cref="T:System.ArgumentNullException">
/// <paramref name="request" /> is null. </exception>
/// <PermissionSet>
/// <IPermission class="System.Security.Permissions.FileIOPermission, mscorlib, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true" />
/// <IPermission class="System.Security.Permissions.SecurityPermission, mscorlib, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Flags="ControlEvidence" />
/// </PermissionSet>
public static Authorization PreAuthenticate(WebRequest request, ICredentials credentials)
{
if (request == null)
{
throw new ArgumentNullException("request");
}
if (credentials == null)
{
return(null);
}
AuthenticationManager.EnsureModules();
ArrayList obj = AuthenticationManager.modules;
lock (obj)
{
foreach (object obj2 in AuthenticationManager.modules)
{
IAuthenticationModule authenticationModule = (IAuthenticationModule)obj2;
Authorization authorization = authenticationModule.PreAuthenticate(request, credentials);
if (authorization != null)
{
authorization.Module = authenticationModule;
return(authorization);
}
}
}
return(null);
}
internal static void Clear()
{
AuthenticationManager.EnsureModules();
ArrayList obj = AuthenticationManager.modules;
lock (obj)
{
AuthenticationManager.modules.Clear();
}
}
private static Authorization DoAuthenticate(string challenge, WebRequest request, ICredentials credentials)
{
AuthenticationManager.EnsureModules();
ArrayList obj = AuthenticationManager.modules;
lock (obj)
{
foreach (object obj2 in AuthenticationManager.modules)
{
IAuthenticationModule authenticationModule = (IAuthenticationModule)obj2;
Authorization authorization = authenticationModule.Authenticate(challenge, request, credentials);
if (authorization != null)
{
authorization.Module = authenticationModule;
return(authorization);
}
}
}
return(null);
}