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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch licenses this file to you under
* the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License 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 org.elasticsearch.hadoop.util.encoding;
import org.elasticsearch.hadoop.thirdparty.apache.commons.httpclient.URIException;
import org.elasticsearch.hadoop.thirdparty.apache.commons.httpclient.util.URIUtil;
import org.elasticsearch.hadoop.EsHadoopIllegalArgumentException;
import org.elasticsearch.hadoop.util.StringUtils;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
/**
* Helpful methods for encoding strings into "application/x-www-form-urlencoded" format
* for safe usage in URLs/URIs.
*/
public final class HttpEncodingTools {
private HttpEncodingTools() {
/* No Constructor */
}
/**
* Splits the given string on the first '?' then encodes the first half as a path (ignoring slashes and colons)
* and the second half as a query segment (ignoring questionmarks, equals signs, etc...).
*
* @deprecated Prefer to use {@link HttpEncodingTools#encode(String)} instead for encoding specific
* pieces of the URI. This method does not escape certain reserved characters, like '/', ':', '=', and '?'.
* As such, this is not safe to use on URIs that may contain these reserved characters in the wrong places.
*/
@Deprecated
public static String encodeUri(String uri) {
try {
return URIUtil.encodePathQuery(uri);
} catch (URIException ex) {
throw new EsHadoopIllegalArgumentException("Cannot escape uri [" + uri + "]", ex);
}
}
/**
* Encodes characters in the string except for those allowed in an absolute path.
*
* @deprecated Prefer to use {@link HttpEncodingTools#encode(String)} instead for encoding specific
* pieces of the URI. This method does not escape certain reserved characters, like '/' and ':'.
* As such, this is not safe to use on paths that may contain these reserved characters in the wrong places.
*/
@Deprecated
public static String encodePath(String path) {
try {
return URIUtil.encodePath(path, "UTF-8");
} catch (URIException ex) {
throw new EsHadoopIllegalArgumentException("Cannot encode path segment [" + path + "]", ex);
}
}
/**
* Encodes all characters in the string into "application/x-www-form-urlencoded" format.
*
* Allowed characters in this case are [a-zA-z0-9] and "_", "-", ".", "*", and space (which becomes a '+' sign)
*
* @param value UTF-8 string to encode.
* @return String in "application/x-www-form-urlencoded" format.
*/
public static String encode(String value) {
try {
// TODO: Potentially fix the plus signs that come out of encoding to be "%20"
return URLEncoder.encode(value, "UTF-8");
} catch (UnsupportedEncodingException e) {
throw new EsHadoopIllegalArgumentException("Cannot encode string [" + value + "]", e);
}
}
/**
* Decodes a "application/x-www-form-urlencoded" format string back to a regular string value,
* returning the "%XX" codes back into UTF-8 Characters.
* @param encoded String in "application/x-www-form-urlencoded" format.
* @return A UTF-8 formatted String.
*/
public static String decode(String encoded) {
try {
return URLDecoder.decode(encoded, "UTF-8");
} catch (UnsupportedEncodingException e) {
throw new EsHadoopIllegalArgumentException("Cannot decode string [" + encoded + "]", e);
}
}
/**
* Encodes each string value of the list and concatenates the results using the supplied delimiter.
*
* @param list To be encoded and concatenated.
* @param delimiter Separator for concatenation.
* @return Concatenated and encoded string representation.
*/
public static String concatenateAndUriEncode(Collection list, String delimiter) {
Collection escaped = new ArrayList();
if (list != null) {
for (Object object : list) {
escaped.add(encode(object.toString()));
}
}
return StringUtils.concatenate(escaped, delimiter);
}
/**
* Given a string of "application/x-www-form-urlencoded" format values, tokenize it and decode the values.
*
* @param string A "application/x-www-form-urlencoded" format string.
* @param delimiters delimiters to use for tokenizing the given string.
* @return List of decoded values (UTF-8) from the original string.
*/
public static List tokenizeAndUriDecode(String string, String delimiters) {
List tokenize = StringUtils.tokenize(string, delimiters, true, true);
List decoded = new ArrayList(tokenize.size());
for (String token : tokenize) {
decoded.add(decode(token));
}
return decoded;
}
}