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src/main/java/com/amazonaws/http/AWSRequestSigningApacheInterceptor.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,184 @@ | ||
| /* | ||
| * Copyright 2012-2017 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.http; | ||
|
|
||
| import com.amazonaws.DefaultRequest; | ||
| import com.amazonaws.auth.AWSCredentialsProvider; | ||
| import com.amazonaws.auth.Signer; | ||
| import org.apache.http.Header; | ||
| import org.apache.http.HttpEntityEnclosingRequest; | ||
| import org.apache.http.HttpException; | ||
| import org.apache.http.HttpHost; | ||
| import org.apache.http.HttpRequest; | ||
| import org.apache.http.HttpRequestInterceptor; | ||
| import org.apache.http.NameValuePair; | ||
| import org.apache.http.client.utils.URIBuilder; | ||
| import org.apache.http.entity.BasicHttpEntity; | ||
| import org.apache.http.message.BasicHeader; | ||
| import org.apache.http.protocol.HttpContext; | ||
|
|
||
| import java.io.ByteArrayInputStream; | ||
| import java.io.IOException; | ||
| import java.net.URI; | ||
| import java.net.URISyntaxException; | ||
| import java.util.ArrayList; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
| import java.util.TreeMap; | ||
|
|
||
| import static org.apache.http.protocol.HttpCoreContext.HTTP_TARGET_HOST; | ||
|
|
||
| /** | ||
| * An {@link HttpRequestInterceptor} that signs requests using any AWS {@link Signer} | ||
| * and {@link AWSCredentialsProvider}. | ||
| */ | ||
| public class AWSRequestSigningApacheInterceptor implements HttpRequestInterceptor { | ||
| /** | ||
| * The service that we're connecting to. Technically not necessary. | ||
| * Could be used by a future Signer, though. | ||
| */ | ||
| private final String service; | ||
|
|
||
| /** | ||
| * The particular signer implementation. | ||
| */ | ||
| private final Signer signer; | ||
|
|
||
| /** | ||
| * The source of AWS credentials for signing. | ||
| */ | ||
| private final AWSCredentialsProvider awsCredentialsProvider; | ||
|
|
||
| /** | ||
| * | ||
| * @param service service that we're connecting to | ||
| * @param signer particular signer implementation | ||
| * @param awsCredentialsProvider source of AWS credentials for signing | ||
| */ | ||
| public AWSRequestSigningApacheInterceptor(final String service, | ||
| final Signer signer, | ||
| final AWSCredentialsProvider awsCredentialsProvider) { | ||
| this.service = service; | ||
| this.signer = signer; | ||
| this.awsCredentialsProvider = awsCredentialsProvider; | ||
| } | ||
|
|
||
| /** | ||
| * {@inheritDoc} | ||
| */ | ||
| @Override | ||
| public void process(final HttpRequest request, final HttpContext context) | ||
| throws HttpException, IOException { | ||
| URIBuilder uriBuilder; | ||
| try { | ||
| uriBuilder = new URIBuilder(request.getRequestLine().getUri()); | ||
| } catch (URISyntaxException e) { | ||
| throw new IOException("Invalid URI" , e); | ||
| } | ||
|
|
||
| // Copy Apache HttpRequest to AWS DefaultRequest | ||
| DefaultRequest<?> signableRequest = new DefaultRequest<>(service); | ||
|
|
||
| HttpHost host = (HttpHost) context.getAttribute(HTTP_TARGET_HOST); | ||
| if (host != null) { | ||
| signableRequest.setEndpoint(URI.create(host.toURI())); | ||
| } | ||
| final HttpMethodName httpMethod = | ||
| HttpMethodName.fromValue(request.getRequestLine().getMethod()); | ||
| signableRequest.setHttpMethod(httpMethod); | ||
| try { | ||
| signableRequest.setResourcePath(uriBuilder.build().getRawPath()); | ||
| } catch (URISyntaxException e) { | ||
| throw new IOException("Invalid URI" , e); | ||
| } | ||
|
|
||
| if (request instanceof HttpEntityEnclosingRequest) { | ||
| HttpEntityEnclosingRequest httpEntityEnclosingRequest = | ||
| (HttpEntityEnclosingRequest) request; | ||
| if (httpEntityEnclosingRequest.getEntity() == null) { | ||
| signableRequest.setContent(new ByteArrayInputStream(new byte[0])); | ||
| } else { | ||
| signableRequest.setContent(httpEntityEnclosingRequest.getEntity().getContent()); | ||
| } | ||
| } | ||
| signableRequest.setParameters(nvpToMapParams(uriBuilder.getQueryParams())); | ||
| signableRequest.setHeaders(headerArrayToMap(request.getAllHeaders())); | ||
|
|
||
| // Sign it | ||
| signer.sign(signableRequest, awsCredentialsProvider.getCredentials()); | ||
|
|
||
| // Now copy everything back | ||
| request.setHeaders(mapToHeaderArray(signableRequest.getHeaders())); | ||
| if (request instanceof HttpEntityEnclosingRequest) { | ||
| HttpEntityEnclosingRequest httpEntityEnclosingRequest = | ||
| (HttpEntityEnclosingRequest) request; | ||
| if (httpEntityEnclosingRequest.getEntity() != null) { | ||
| BasicHttpEntity basicHttpEntity = new BasicHttpEntity(); | ||
| basicHttpEntity.setContent(signableRequest.getContent()); | ||
| httpEntityEnclosingRequest.setEntity(basicHttpEntity); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * | ||
| * @param params list of HTTP query params as NameValuePairs | ||
| * @return a multimap of HTTP query params | ||
| */ | ||
| private static Map<String, List<String>> nvpToMapParams(final List<NameValuePair> params) { | ||
| Map<String, List<String>> parameterMap = new TreeMap<>(String.CASE_INSENSITIVE_ORDER); | ||
| for (NameValuePair nvp : params) { | ||
| List<String> argsList = | ||
| parameterMap.computeIfAbsent(nvp.getName(), k -> new ArrayList<>()); | ||
| argsList.add(nvp.getValue()); | ||
| } | ||
| return parameterMap; | ||
| } | ||
|
|
||
| /** | ||
| * @param headers modeled Header objects | ||
| * @return a Map of header entries | ||
| */ | ||
| private static Map<String, String> headerArrayToMap(final Header[] headers) { | ||
| Map<String, String> headersMap = new TreeMap<>(String.CASE_INSENSITIVE_ORDER); | ||
| for (Header header : headers) { | ||
| if (!skipHeader(header)) { | ||
| headersMap.put(header.getName(), header.getValue()); | ||
| } | ||
| } | ||
| return headersMap; | ||
| } | ||
|
|
||
| /** | ||
| * @param header header line to check | ||
| * @return true if the given header should be excluded when signing | ||
| */ | ||
| private static boolean skipHeader(final Header header) { | ||
| return ("content-length".equalsIgnoreCase(header.getName()) | ||
| && "0".equals(header.getValue())) // Strip Content-Length: 0 | ||
| || "host".equalsIgnoreCase(header.getName()); // Host comes from endpoint | ||
| } | ||
|
|
||
| /** | ||
| * @param mapHeaders Map of header entries | ||
| * @return modeled Header objects | ||
| */ | ||
| private static Header[] mapToHeaderArray(final Map<String, String> mapHeaders) { | ||
| Header[] headers = new Header[mapHeaders.size()]; | ||
| int i = 0; | ||
| for (Map.Entry<String, String> headerEntry : mapHeaders.entrySet()) { | ||
| headers[i++] = new BasicHeader(headerEntry.getKey(), headerEntry.getValue()); | ||
| } | ||
| return headers; | ||
| } | ||
| } |
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