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81 lines
3 KiB
Java
81 lines
3 KiB
Java
// Copyright 2016 The Domain Registry Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package google.registry.testing;
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import static com.google.common.base.Preconditions.checkNotNull;
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import static java.nio.charset.StandardCharsets.UTF_8;
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import com.google.common.collect.ArrayListMultimap;
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import com.google.common.collect.ListMultimap;
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import java.io.UnsupportedEncodingException;
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import java.net.URLDecoder;
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/**
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* Utility class for working with <a href="http://goo.gl/OQEc8">application/x-www-form-urlencoded
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* content type</a> data.
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*/
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public final class UriParameters {
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/**
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* Constructs a new parameter map populated with parameters parsed from the specified query string
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* using the specified encoding.
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*
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* @param query the query string, e.g., {@code "q=flowers&n=20"}
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* @return a mutable parameter map representing the query string
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*/
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public static ListMultimap<String, String> parse(String query) {
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checkNotNull(query);
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ArrayListMultimap<String, String> map = ArrayListMultimap.create();
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if (!query.isEmpty()) {
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int start = 0;
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while (start <= query.length()) {
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// Find the end of the current parameter.
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int ampersandIndex = query.indexOf('&', start);
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if (ampersandIndex == -1) {
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ampersandIndex = query.length();
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}
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int equalsIndex = query.indexOf('=', start);
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if (equalsIndex > ampersandIndex) {
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// Equal is in the next parameter, so this parameter has no value.
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equalsIndex = -1;
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}
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int paramNameEndIndex = (equalsIndex == -1) ? ampersandIndex : equalsIndex;
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String name = decodeString(query, start, paramNameEndIndex);
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String value = (equalsIndex == -1)
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? ""
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: decodeString(query, equalsIndex + 1, ampersandIndex);
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map.put(name, value);
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start = ampersandIndex + 1;
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}
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}
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return map;
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}
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private static String decodeString(String str, int start, int end) {
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try {
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return URLDecoder.decode(str.substring(start, end), UTF_8.name());
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} catch (IllegalArgumentException iae) {
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// According to the javadoc of URLDecoder, when the input string is
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// illegal, it could either leave the illegal characters alone or throw
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// an IllegalArgumentException! To deal with both consistently, we
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// ignore IllegalArgumentException and just return the original string.
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return str.substring(start, end);
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} catch (UnsupportedEncodingException e) {
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throw new RuntimeException(e);
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}
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}
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private UriParameters() {}
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}
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