/*
* Copyright 2010-2011 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file is distributed
* on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied. See the License for the specific language governing
* permissions and limitations under the License.
*/
package com.amazonaws.services.s3.internal;
import java.security.SignatureException;
import java.util.Date;
import com.amazonaws.Request;
import com.amazonaws.auth.AWSCredentials;
import com.amazonaws.auth.AbstractAWSSigner;
import com.amazonaws.auth.SigningAlgorithm;
public class S3QueryStringSigner<T> extends AbstractAWSSigner {
/** AWS Credentials */
private final AWSCredentials credentials;
/**
* The HTTP verb (GET, PUT, HEAD, DELETE) the request to sign
* is using.
*
* TODO: We need to know the HTTP verb in order to
* create the authentication signature, but we don't
* have easy access to it through the request object.
*
* Maybe it'd be better for the S3 signer (or all signers?)
* to work directly off of the HttpRequest instead of
* the Request object?
*/
private final String httpVerb;
/**
* The canonical resource path portion of the S3 string to sign.
* Examples: "/", "/<bucket name>/", or "/<bucket name>/<key>"
*
* TODO: We don't want to hold the resource path as member data in the S3
* signer, but we need access to it and can't get it through the
* request yet.
*/
private final String resourcePath;
private final Date expiration;
public S3QueryStringSigner(AWSCredentials credentials, String httpVerb, String resourcePath, Date expiration) {
this.credentials = credentials;
this.httpVerb = httpVerb;
this.resourcePath = resourcePath;
this.expiration = expiration;
if (resourcePath == null)
throw new IllegalArgumentException("Parameter resourcePath is empty");
}
public void sign(Request<T> request) throws SignatureException {
String expirationInSeconds = Long.toString(expiration.getTime() / 1000L);
String canonicalString = RestUtils.makeS3CanonicalString(
httpVerb, resourcePath, request, expirationInSeconds);
AWSCredentials sanitizedCredentials = sanitizeCredentials(credentials);
String signature = super.sign(canonicalString, sanitizedCredentials.getAWSSecretKey(), SigningAlgorithm.HmacSHA1);
request.addParameter("AWSAccessKeyId", sanitizedCredentials.getAWSAccessKeyId());
request.addParameter("Expires", expirationInSeconds);
request.addParameter("Signature", signature);
}
}