add aws s3 signature v4

apis/s3/src/main/java/org/jclouds/s3/config/S3HttpApiModule.java

@@ -17,6 +17,7 @@
 package org.jclouds.s3.config;
 
 import java.net.URI;
+import java.util.Date;
 import java.util.Set;
 import java.util.concurrent.TimeUnit;
 
@@ -33,6 +34,7 @@
 import org.jclouds.date.DateService;
 import org.jclouds.date.TimeStamp;
 import org.jclouds.http.HttpErrorHandler;
+import org.jclouds.http.HttpRequest;
 import org.jclouds.http.HttpRetryHandler;
 import org.jclouds.http.annotation.ClientError;
 import org.jclouds.http.annotation.Redirection;
@@ -172,13 +174,26 @@ protected void bindErrorHandlers() {
    }
 
    protected void bindRequestSigner() {
-      bind(RequestAuthorizeSignature.class).in(Scopes.SINGLETON);
+      bind(RequestAuthorizeSignature.class).to(RequestAuthorizeSignature.RequestAuthorizeSignatureV2.class).in(Scopes.SINGLETON);
    }
 
    @Provides
    @Singleton
    protected RequestSigner provideRequestSigner(RequestAuthorizeSignature in) {
-      return in;
+      if (in instanceof RequestSigner) {
+         return (RequestSigner) in;
+      }
+      return new RequestSigner() {
+         @Override
+         public String createStringToSign(HttpRequest input) {
+            return null;
+         }
+
+         @Override
+         public String sign(String toSign) {
+            return null;
+         }
+      };
    }
 
    @Override
@@ -208,4 +223,27 @@ public String get() {
          }
       }, seconds, TimeUnit.SECONDS);
    }
+
+   @Provides
+   @TimeStamp
+   protected Date provideTimeStampDate(@TimeStamp Supplier<Date> cache) {
+      return cache.get();
+   }
+
+    /**
+    * borrowing concurrency code to ensure that caching takes place properly
+    */
+   @Provides
+   @TimeStamp
+   @Singleton
+   protected Supplier<Date> provideTimeStampCacheDate(
+      @Named(Constants.PROPERTY_SESSION_INTERVAL) long seconds,
+      @TimeStamp final Supplier<String> timestamp,
+      final DateService dateService) {
+      return Suppliers.memoizeWithExpiration(new Supplier<Date>() {
+         public Date get() {
+            return dateService.rfc822DateParse(timestamp.get());
+         }
+      }, seconds, TimeUnit.SECONDS);
+   }
 }