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Amazon Web Services SDK for Android
/*
* Copyright 2011-2014 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.http;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URI;
import java.util.Map.Entry;
import org.apache.http.HttpEntity;
import org.apache.http.client.methods.HttpDelete;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpHead;
import org.apache.http.client.methods.HttpPatch;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpPut;
import org.apache.http.client.methods.HttpRequestBase;
import org.apache.http.entity.BufferedHttpEntity;
import org.apache.http.entity.StringEntity;
import org.apache.http.params.CoreProtocolPNames;
import com.amazonaws.AmazonClientException;
import com.amazonaws.ClientConfiguration;
import com.amazonaws.Request;
import com.amazonaws.util.HttpUtils;
/** Responsible for creating Apache HttpClient 4 request objects. */
class HttpRequestFactory {
private static final String DEFAULT_ENCODING = "UTF-8";
/**
* Creates an HttpClient method object based on the specified request and
* populates any parameters, headers, etc. from the original request.
*
* @param request
* The request to convert to an HttpClient method object.
* @param context
* The execution context of the HTTP method to be executed
*
* @return The converted HttpClient method object with any parameters,
* headers, etc. from the original request set.
*/
HttpRequestBase createHttpRequest(Request request, ClientConfiguration clientConfiguration, ExecutionContext context) {
URI endpoint = request.getEndpoint();
/*
* HttpClient cannot handle url in pattern of "http://host//path", so we
* have to escape the double-slash between endpoint and resource-path
* into "/%2F"
*/
String uri = HttpUtils.appendUri(endpoint.toString(), request.getResourcePath(), true);
String encodedParams = HttpUtils.encodeParameters(request);
/*
* For all non-POST requests, and any POST requests that already have a
* payload, we put the encoded params directly in the URI, otherwise,
* we'll put them in the POST request's payload.
*/
boolean requestHasNoPayload = request.getContent() != null;
boolean requestIsPost = request.getHttpMethod() == HttpMethodName.POST;
boolean putParamsInUri = !requestIsPost || requestHasNoPayload;
if (encodedParams != null && putParamsInUri) {
uri += "?" + encodedParams;
}
HttpRequestBase httpRequest;
if (request.getHttpMethod() == HttpMethodName.POST) {
HttpPost postMethod = new HttpPost(uri);
/*
* If there isn't any payload content to include in this request,
* then try to include the POST parameters in the query body,
* otherwise, just use the query string. For all AWS Query services,
* the best behavior is putting the params in the request body for
* POST requests, but we can't do that for S3.
*/
if (request.getContent() == null && encodedParams != null) {
postMethod.setEntity(newStringEntity(encodedParams));
} else {
postMethod.setEntity(new RepeatableInputStreamRequestEntity(request));
}
httpRequest = postMethod;
} else if (request.getHttpMethod() == HttpMethodName.PUT) {
HttpPut putMethod = new HttpPut(uri);
httpRequest = putMethod;
/*
* Enable 100-continue support for PUT operations, since this is
* where we're potentially uploading large amounts of data and want
* to find out as early as possible if an operation will fail. We
* don't want to do this for all operations since it will cause
* extra latency in the network interaction.
*/
putMethod.getParams().setParameter(CoreProtocolPNames.USE_EXPECT_CONTINUE, true);
/*
* We should never reuse the entity of the previous request, since
* reading from the buffered entity will bypass reading from the
* original request content. And if the content contains InputStream
* wrappers that were added for validation-purpose (e.g.
* Md5DigestCalculationInputStream), these wrappers would never be
* read and updated again after AmazonHttpClient resets it in
* preparation for the retry. Eventually, these wrappers would
* return incorrect validation result.
*/
if (request.getContent() != null) {
HttpEntity entity = new RepeatableInputStreamRequestEntity(request);
if (request.getHeaders().get("Content-Length") == null) {
entity = newBufferedHttpEntity(entity);
}
putMethod.setEntity(entity);
}
} else if (request.getHttpMethod() == HttpMethodName.PATCH) {
HttpPatch patchMethod = new HttpPatch(uri);
httpRequest = patchMethod;
/*
* We should never reuse the entity of the previous request, since
* reading from the buffered entity will bypass reading from the
* original request content. And if the content contains InputStream
* wrappers that were added for validation-purpose (e.g.
* Md5DigestCalculationInputStream), these wrappers would never be
* read and updated again after AmazonHttpClient resets it in
* preparation for the retry. Eventually, these wrappers would
* return incorrect validation result.
*/
if (request.getContent() != null) {
HttpEntity entity = new RepeatableInputStreamRequestEntity(request);
if (request.getHeaders().get("Content-Length") == null) {
entity = newBufferedHttpEntity(entity);
}
patchMethod.setEntity(entity);
}
} else if (request.getHttpMethod() == HttpMethodName.GET) {
httpRequest = new HttpGet(uri);
} else if (request.getHttpMethod() == HttpMethodName.DELETE) {
httpRequest = new HttpDelete(uri);
} else if (request.getHttpMethod() == HttpMethodName.HEAD) {
httpRequest = new HttpHead(uri);
} else {
throw new AmazonClientException("Unknown HTTP method name: " + request.getHttpMethod());
}
configureHeaders(httpRequest, request, context, clientConfiguration);
return httpRequest;
}
/** Configures the headers in the specified Apache HTTP request. */
private void configureHeaders(HttpRequestBase httpRequest, Request request, ExecutionContext context, ClientConfiguration clientConfiguration) {
/*
* Apache HttpClient omits the port number in the Host header (even if
* we explicitly specify it) if it's the default port for the protocol
* in use. To ensure that we use the same Host header in the request and
* in the calculated string to sign (even if Apache HttpClient changed
* and started honoring our explicit host with endpoint), we follow this
* same behavior here and in the QueryString signer.
*/
URI endpoint = request.getEndpoint();
String hostHeader = endpoint.getHost();
if (HttpUtils.isUsingNonDefaultPort(endpoint)) {
hostHeader += ":" + endpoint.getPort();
}
httpRequest.addHeader("Host", hostHeader);
// Copy over any other headers already in our request
for (Entry entry : request.getHeaders().entrySet()) {
/*
* HttpClient4 fills in the Content-Length header and complains if
* it's already present, so we skip it here. We also skip the Host
* header to avoid sending it twice, which will interfere with some
* signing schemes.
*/
if (entry.getKey().equalsIgnoreCase("Content-Length") || entry.getKey().equalsIgnoreCase("Host")) continue;
httpRequest.addHeader(entry.getKey(), entry.getValue());
}
/* Set content type and encoding */
if (httpRequest.getHeaders("Content-Type") == null || httpRequest.getHeaders("Content-Type").length == 0) {
httpRequest.addHeader("Content-Type",
"application/x-www-form-urlencoded; " +
"charset=" + DEFAULT_ENCODING.toLowerCase());
}
// Override the user agent string specified in the client params if the context requires it
if (context != null && context.getContextUserAgent() != null) {
httpRequest.addHeader("User-Agent", createUserAgentString(clientConfiguration, context.getContextUserAgent()));
}
}
/** Appends the given user-agent string to the client's existing one and returns it. */
private String createUserAgentString(ClientConfiguration clientConfiguration, String contextUserAgent) {
if (clientConfiguration.getUserAgent().contains(contextUserAgent)) {
return clientConfiguration.getUserAgent();
} else {
return clientConfiguration.getUserAgent() + " " + contextUserAgent;
}
}
/**
* Utility function for creating a new StringEntity and wrapping any errors
* as an AmazonClientException.
*
* @param s
* The string contents of the returned HTTP entity.
*
* @return A new StringEntity with the specified contents.
*/
private HttpEntity newStringEntity(String s) {
try {
return new StringEntity(s);
} catch (UnsupportedEncodingException e) {
throw new AmazonClientException("Unable to create HTTP entity: " + e.getMessage(), e);
}
}
/**
* Utility function for creating a new BufferedEntity and wrapping any errors
* as an AmazonClientException.
*
* @param entity
* The HTTP entity to wrap with a buffered HTTP entity.
*
* @return A new BufferedHttpEntity wrapping the specified entity.
*/
private HttpEntity newBufferedHttpEntity(HttpEntity entity) {
try {
return new BufferedHttpEntity(entity);
} catch (IOException e) {
throw new AmazonClientException("Unable to create HTTP entity: " + e.getMessage(), e);
}
}
}