Add simple handler for GetBucketPolicy

Fixes #301.

src/main/java/org/gaul/s3proxy/S3ErrorCode.java

@@ -75,6 +75,8 @@ enum S3ErrorCode {
             "The specified bucket does not exist"),
     NO_SUCH_KEY(HttpServletResponse.SC_NOT_FOUND,
             "The specified key does not exist."),
+    NO_SUCH_POLICY(HttpServletResponse.SC_NOT_FOUND,
+            "The specified bucket does not have a bucket policy."),
     NO_SUCH_UPLOAD(HttpServletResponse.SC_NOT_FOUND, "Not Found"),
     NOT_IMPLEMENTED(HttpServletResponse.SC_NOT_IMPLEMENTED,
             "A header you provided implies functionality that is not" +

src/main/java/org/gaul/s3proxy/S3ProxyHandler.java

@@ -146,7 +146,6 @@ public class S3ProxyHandler {
             "logging",
             "metrics",
             "notification",
-            "policy",
             "replication",
             "requestPayment",
             "restore",
@@ -657,6 +656,9 @@ public class S3ProxyHandler {
                 } else if ("".equals(request.getParameter("location"))) {
                     handleContainerLocation(response);
                     return;
+                } else if ("".equals(request.getParameter("policy"))) {
+                    handleBucketPolicy(response, blobStore, path[1]);
+                    return;
                 } else if ("".equals(request.getParameter("uploads"))) {
                     handleListMultipartUploads(request, response, blobStore,
                             path[1]);
@@ -1135,6 +1137,14 @@ public class S3ProxyHandler {
         }
     }
 
+    private static void handleBucketPolicy(HttpServletResponse response,
+            BlobStore blobStore, String containerName) throws S3Exception {
+        if (!blobStore.containerExists(containerName)) {
+            throw new S3Exception(S3ErrorCode.NO_SUCH_BUCKET);
+        }
+        throw new S3Exception(S3ErrorCode.NO_SUCH_POLICY);
+    }
+
     private void handleListMultipartUploads(HttpServletRequest request,
             HttpServletResponse response, BlobStore blobStore,
             String container) throws IOException, S3Exception {

src/test/java/org/gaul/s3proxy/AwsSdkTest.java

@@ -1443,6 +1443,16 @@ public final class AwsSdkTest {
         }
     }
 
+    @Test
+    public void testGetBucketPolicy() throws Exception {
+        try {
+            client.getBucketPolicy(containerName);
+            Fail.failBecauseExceptionWasNotThrown(AmazonS3Exception.class);
+        } catch (AmazonS3Exception e) {
+            assertThat(e.getErrorCode()).isEqualTo("NoSuchPolicy");
+        }
+    }
+
     @Test
     public void testUnknownParameter() throws Exception {
         try {