net.oauth.client.httpclient4

Class PreemptiveAuthorizer

java.lang.Object

net.oauth.client.httpclient4.PreemptiveAuthorizer

All Implemented Interfaces:

org.apache.http.HttpRequestInterceptor

public class PreemptiveAuthorizer
extends Object
implements org.apache.http.HttpRequestInterceptor

An interceptor that initiates authorization without waiting for a challenge from the server. This avoids a response/request exchange (for the challenge), but it doesn't give the server a chance to select the authorization scheme or realm.

To make this work:

• In your HttpContext attributes, set a list of preferred auth scheme names.
• In your DigestHttpClient auth schemes, register an AuthSchemeFactory for at least one of those schemes.
• In your DigestHttpClient credentials provider, set Credentials for an AuthScope that will match your request.
• In your DigestHttpClient params, register any parameters the AuthSchemeFactory requires.
• In your DigestHttpClient, add an instance of this interceptor.

Here's an example using OAuth:

 context = new BasicHttpContext();
 context.setAttribute(ClientContext.AUTH_SCHEME_PREF,
   Arrays.asList(OAuthSchemeFactory.SCHEME_NAME));
 client = new DefaultHttpClient();
 client.getAuthSchemes().register(OAuthSchemeFactory.SCHEME_NAME,
   new OAuthSchemeFactory());
 client.getCredentialsProvider().setCredentials(new AuthScope("server.com", 80),
   new OAuthCredentials(accessor));
 client.getParams().setParameter(OAuthSchemeFactory.DEFAULT_REALM,
   ProtectedResource.REALM);
 client.addRequestInterceptor(new PreemptiveAuthorizer(), 0);
 

Author:

John Kristian

Constructor Summary

Constructors

Constructor and Description
PreemptiveAuthorizer()

Method Summary

Modifier and Type	Method and Description
void	process(org.apache.http.HttpRequest request, org.apache.http.protocol.HttpContext context) If no auth scheme has been selected for the given context, consider each of the preferred auth schemes and select the first one for which an AuthScheme and matching Credentials are available.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

PreemptiveAuthorizer

public PreemptiveAuthorizer()

Method Detail

process

public void process(org.apache.http.HttpRequest request,
                    org.apache.http.protocol.HttpContext context)
             throws org.apache.http.HttpException,
                    IOException

If no auth scheme has been selected for the given context, consider each of the preferred auth schemes and select the first one for which an AuthScheme and matching Credentials are available.

Specified by:

process in interface org.apache.http.HttpRequestInterceptor

Throws:

org.apache.http.HttpException

IOException