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Amazon Web Services SDK for Android
/*
* Copyright 2010-2014 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.auth;
import static com.amazonaws.util.StringUtils.UTF8;
import java.net.MalformedURLException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Date;
import java.util.List;
import java.util.Map;
import java.util.SortedMap;
import java.util.TreeMap;
import java.util.UUID;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import com.amazonaws.AmazonClientException;
import com.amazonaws.Request;
import com.amazonaws.util.DateUtils;
import com.amazonaws.util.HttpUtils;
/**
* Signer implementation that signs requests with the AWS3 signing protocol.
*/
public class AWS3Signer extends AbstractAWSSigner {
private static final String AUTHORIZATION_HEADER = "X-Amzn-Authorization";
private static final String NONCE_HEADER = "x-amz-nonce";
private static final String HTTP_SCHEME = "AWS3";
private static final String HTTPS_SCHEME = "AWS3-HTTPS";
/** For internal testing only - allows the request's date to be overridden for testing. */
private String overriddenDate;
@Deprecated
protected static final DateUtils dateUtils = new DateUtils();
private static final Log log = LogFactory.getLog(AWS3Signer.class);
/**
* Signs the specified request with the AWS3 signing protocol by using the
* AWS account credentials specified when this object was constructed and
* adding the required AWS3 headers to the request.
*
* @param request
* The request to sign.
*/
public void sign(Request request, AWSCredentials credentials) throws AmazonClientException {
// annonymous credentials, don't sign
if ( credentials instanceof AnonymousAWSCredentials ) {
return;
}
AWSCredentials sanitizedCredentials = sanitizeCredentials(credentials);
SigningAlgorithm algorithm = SigningAlgorithm.HmacSHA256;
String nonce = UUID.randomUUID().toString();
int timeOffset = getTimeOffset(request);
Date dateValue = getSignatureDate(timeOffset);
String date = DateUtils.formatRFC822Date(dateValue);
boolean isHttps = false;
if (overriddenDate != null) date = overriddenDate;
request.addHeader("Date", date);
request.addHeader("X-Amz-Date", date);
// AWS3 HTTP requires that we sign the Host header
// so we have to have it in the request by the time we sign.
String hostHeader = request.getEndpoint().getHost();
if (HttpUtils.isUsingNonDefaultPort(request.getEndpoint())) {
hostHeader += ":" + request.getEndpoint().getPort();
}
request.addHeader("Host", hostHeader);
if ( sanitizedCredentials instanceof AWSSessionCredentials ) {
addSessionCredentials(request, (AWSSessionCredentials) sanitizedCredentials);
}
byte[] bytesToSign;
String stringToSign;
if (isHttps) {
request.addHeader(NONCE_HEADER, nonce);
stringToSign = date + nonce;
bytesToSign = stringToSign.getBytes(UTF8);
} else {
String path = HttpUtils.appendUri(request.getEndpoint().getPath(), request.getResourcePath());
/*
* AWS3 requires all query params to be listed on the third line of
* the string to sign, even if those query params will be sent in
* the request body and not as a query string. POST formatted query
* params should *NOT* be included in the request payload.
*/
stringToSign = request.getHttpMethod().toString() + "\n"
+ getCanonicalizedResourcePath(path) + "\n"
+ getCanonicalizedQueryString(request.getParameters()) + "\n"
+ getCanonicalizedHeadersForStringToSign(request) + "\n"
+ getRequestPayloadWithoutQueryParams(request);
bytesToSign = hash(stringToSign);
}
log.debug("Calculated StringToSign: " + stringToSign);
String signature = signAndBase64Encode(bytesToSign, sanitizedCredentials.getAWSSecretKey(), algorithm);
StringBuilder builder = new StringBuilder();
builder.append(isHttps ? HTTPS_SCHEME : HTTP_SCHEME).append(" ");
builder.append("AWSAccessKeyId=" + sanitizedCredentials.getAWSAccessKeyId() + ",");
builder.append("Algorithm=" + algorithm.toString() + ",");
if (!isHttps) {
builder.append(getSignedHeadersComponent(request) + ",");
}
builder.append("Signature=" + signature);
request.addHeader(AUTHORIZATION_HEADER, builder.toString());
}
private String getSignedHeadersComponent(Request request) {
StringBuilder builder = new StringBuilder();
builder.append("SignedHeaders=");
boolean first = true;
for (String header : getHeadersForStringToSign(request)) {
if (!first) builder.append(";");
builder.append(header);
first = false;
}
return builder.toString();
}
protected List getHeadersForStringToSign(Request request) {
List headersToSign = new ArrayList();
for (Map.Entry entry : request.getHeaders().entrySet()) {
String key = entry.getKey();
String lowerCaseKey = key.toLowerCase();
if (lowerCaseKey.startsWith("x-amz")
|| lowerCaseKey.equals("host")) {
headersToSign.add(key);
}
}
Collections.sort(headersToSign);
return headersToSign;
}
/**
* For internal testing only - allows the date to be overridden for internal
* tests.
*
* @param date
* The RFC822 date string to use when signing requests.
*/
void overrideDate(String date) {
this.overriddenDate = date;
}
protected String getCanonicalizedHeadersForStringToSign(Request request) {
List headersToSign = getHeadersForStringToSign(request);
for (int i = 0; i < headersToSign.size(); i++) {
headersToSign.set(i, headersToSign.get(i).toLowerCase());
}
SortedMap sortedHeaderMap = new TreeMap();
for (Map.Entry entry : request.getHeaders().entrySet()) {
if (headersToSign.contains(entry.getKey().toLowerCase())) {
sortedHeaderMap.put(entry.getKey().toLowerCase(), entry.getValue());
}
}
StringBuilder builder = new StringBuilder();
for (Map.Entry entry : sortedHeaderMap.entrySet()) {
builder.append(entry.getKey().toLowerCase()).append(":")
.append(entry.getValue()).append("\n");
}
return builder.toString();
}
protected boolean shouldUseHttpsScheme(Request request) throws AmazonClientException {
try {
String protocol = request.getEndpoint().toURL().getProtocol().toLowerCase();
if (protocol.equals("http")) {
return false;
} else if (protocol.equals("https")) {
return true;
} else {
throw new AmazonClientException("Unknown request endpoint protocol " +
"encountered while signing request: " + protocol);
}
} catch (MalformedURLException e) {
throw new AmazonClientException("Unable to parse request endpoint during signing", e);
}
}
@Override
protected void addSessionCredentials(Request request, AWSSessionCredentials credentials) {
request.addHeader("x-amz-security-token", credentials.getSessionToken());
}
}