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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.util;
import java.io.FilterInputStream;
import java.io.InputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URI;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.Map.Entry;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.apache.http.HttpEntity;
import org.apache.http.HttpHost;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.NTCredentials;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.utils.URLEncodedUtils;
import org.apache.http.conn.params.ConnRoutePNames;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
import org.apache.http.params.HttpProtocolParams;
import com.amazonaws.ClientConfiguration;
import com.amazonaws.Request;
import com.amazonaws.http.HttpMethodName;
public class HttpUtils {
private static final String DEFAULT_ENCODING = "UTF-8";
/**
* Regex which matches any of the sequences that we need to fix up after
* URLEncoder.encode().
*/
private static final Pattern ENCODED_CHARACTERS_PATTERN;
static {
StringBuilder pattern = new StringBuilder();
pattern
.append(Pattern.quote("+"))
.append("|")
.append(Pattern.quote("*"))
.append("|")
.append(Pattern.quote("%7E"))
.append("|")
.append(Pattern.quote("%2F"));
ENCODED_CHARACTERS_PATTERN = Pattern.compile(pattern.toString());
}
/**
* Encode a string for use in the path of a URL; uses URLEncoder.encode,
* (which encodes a string for use in the query portion of a URL), then
* applies some postfilters to fix things up per the RFC. Can optionally
* handle strings which are meant to encode a path (ie include '/'es
* which should NOT be escaped).
*
* @param value the value to encode
* @param path true if the value is intended to represent a path
* @return the encoded value
*/
public static String urlEncode(final String value, final boolean path) {
if (value == null) {
return "";
}
try {
String encoded = URLEncoder.encode(value, DEFAULT_ENCODING);
Matcher matcher = ENCODED_CHARACTERS_PATTERN.matcher(encoded);
StringBuffer buffer = new StringBuffer(encoded.length());
while (matcher.find()) {
String replacement = matcher.group(0);
if ("+".equals(replacement)) {
replacement = "%20";
} else if ("*".equals(replacement)) {
replacement = "%2A";
} else if ("%7E".equals(replacement)) {
replacement = "~";
} else if (path && "%2F".equals(replacement)) {
replacement = "/";
}
matcher.appendReplacement(buffer, replacement);
}
matcher.appendTail(buffer);
return buffer.toString();
} catch (UnsupportedEncodingException ex) {
throw new RuntimeException(ex);
}
}
/**
* Returns true if the specified URI is using a non-standard port (i.e. any
* port other than 80 for HTTP URIs or any port other than 443 for HTTPS
* URIs).
*
* @param uri
*
* @return True if the specified URI is using a non-standard port, otherwise
* false.
*/
public static boolean isUsingNonDefaultPort(URI uri) {
String scheme = uri.getScheme().toLowerCase();
int port = uri.getPort();
if (port <= 0) return false;
if (scheme.equals("http") && port == 80) return false;
if (scheme.equals("https") && port == 443) return false;
return true;
}
public static boolean usePayloadForQueryParameters(Request request) {
boolean requestIsPOST = HttpMethodName.POST.equals(request.getHttpMethod());
boolean requestHasNoPayload = (request.getContent() == null);
return requestIsPOST && requestHasNoPayload;
}
/**
* Creates an encoded query string from all the parameters in the specified
* request.
*
* @param request
* The request containing the parameters to encode.
*
* @return Null if no parameters were present, otherwise the encoded query
* string for the parameters present in the specified request.
*/
public static String encodeParameters(Request request) {
List nameValuePairs = null;
if (request.getParameters().size() > 0) {
nameValuePairs = new ArrayList(request.getParameters().size());
for (Entry entry : request.getParameters().entrySet()) {
nameValuePairs.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
}
}
String encodedParams = null;
if (nameValuePairs != null) {
encodedParams = URLEncodedUtils.format(nameValuePairs, DEFAULT_ENCODING);
}
return encodedParams;
}
/**
* Append the given path to the given baseUri.
* By default, all slash characters in path will not be url-encoded.
*/
public static String appendUri(String baseUri, String path) {
return appendUri(baseUri, path, false);
}
/**
* Append the given path to the given baseUri.
*
* This method will encode the given path but not the given
* baseUri.
*
* @param baseUri The URI to append to (required, may be relative)
* @param path The path to append (may be null or empty)
* @param escapeDoubleSlash Whether double-slash in the path should be escaped to "/%2F"
* @return The baseUri with the (encoded) path appended
*/
public static String appendUri(final String baseUri, String path, final boolean escapeDoubleSlash ) {
String resultUri = baseUri;
if (path != null && path.length() > 0) {
if (path.startsWith("/")) {
// trim the trailing slash in baseUri, since the path already starts with a slash
if (resultUri.endsWith("/")) {
resultUri = resultUri.substring(0, resultUri.length() - 1);
}
} else if (!resultUri.endsWith("/")) {
resultUri += "/";
}
String encodedPath = HttpUtils.urlEncode(path, true);
if (escapeDoubleSlash) {
encodedPath = encodedPath.replace("//", "/%2F");
}
resultUri += encodedPath;
} else if (!resultUri.endsWith("/")) {
resultUri += "/";
}
return resultUri;
}
/**
* Fetches a file from the URI given and returns an input stream to it.
*
* @param uri the uri of the file to fetch
* @param config optional configuration overrides
* @return an InputStream containing the retrieved data
* @throws IOException on error
*/
public static InputStream fetchFile(
final URI uri,
final ClientConfiguration config) throws IOException {
HttpParams httpClientParams = new BasicHttpParams();
HttpProtocolParams.setUserAgent(
httpClientParams, getUserAgent(config));
HttpConnectionParams.setConnectionTimeout(
httpClientParams, getConnectionTimeout(config));
HttpConnectionParams.setSoTimeout(
httpClientParams, getSocketTimeout(config));
DefaultHttpClient httpclient = new DefaultHttpClient(httpClientParams);
if (config != null) {
String proxyHost = config.getProxyHost();
int proxyPort = config.getProxyPort();
if (proxyHost != null && proxyPort > 0) {
HttpHost proxy = new HttpHost(proxyHost, proxyPort);
httpclient.getParams().setParameter(
ConnRoutePNames.DEFAULT_PROXY, proxy);
if (config.getProxyUsername() != null
&& config.getProxyPassword() != null) {
httpclient.getCredentialsProvider().setCredentials(
new AuthScope(proxyHost, proxyPort),
new NTCredentials(config.getProxyUsername(),
config.getProxyPassword(),
config.getProxyWorkstation(),
config.getProxyDomain()));
}
}
}
HttpResponse response = httpclient.execute(new HttpGet(uri));
if (response.getStatusLine().getStatusCode() != 200) {
throw new IOException("Error fetching file from " + uri + ": "
+ response);
}
return new HttpClientWrappingInputStream(
httpclient,
response.getEntity().getContent());
}
private static String getUserAgent(final ClientConfiguration config) {
String userAgent = null;
if (config != null) {
userAgent = config.getUserAgent();
}
if (userAgent == null) {
userAgent = ClientConfiguration.DEFAULT_USER_AGENT;
} else if (!ClientConfiguration.DEFAULT_USER_AGENT.equals(userAgent)) {
userAgent += ", " + ClientConfiguration.DEFAULT_USER_AGENT;
}
return userAgent;
}
private static int getConnectionTimeout(final ClientConfiguration config) {
if (config != null) {
return config.getConnectionTimeout();
}
return ClientConfiguration.DEFAULT_CONNECTION_TIMEOUT;
}
private static int getSocketTimeout(final ClientConfiguration config) {
if (config != null) {
return config.getSocketTimeout();
}
return ClientConfiguration.DEFAULT_SOCKET_TIMEOUT;
}
}