TinyHttpUtil.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF 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 net.morimekta.tiny.server.http;

import java.util.HashMap;
import java.util.Map;

import static java.net.URLDecoder.decode;
import static java.nio.charset.StandardCharsets.UTF_8;

public final class TinyHttpUtil {
    /**
     * Very simple URL query parser.
     *
     * @param query The query string.
     * @return Map of query argument to value.
     */
    public static Map<String, String> parseQuery(String query) {
        if (query == null) {
            return Map.of();
        }
        if (query.isEmpty()) {
            return Map.of();
        }
        var queryMap = new HashMap<String, String>();
        for (String part : query.split("&")) {
            if (part.isEmpty()) {
                continue;
            }
            String[] kv = part.split("=", 2);
            if (kv[0].isEmpty()) {
                // Ignore argument?
                continue;
            }
            if (kv.length == 2) {
                queryMap.put(decode(kv[0], UTF_8), decode(kv[1], UTF_8));
            } else {
                queryMap.put(decode(kv[0], UTF_8), "");
            }
        }
        return Map.copyOf(queryMap);
    }

    // ------ PRIVATE ------
    private TinyHttpUtil() {}
}