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/*
 * 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 com.aliyuncs.auth;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;

public class AcsURLEncoder {
    public final static String URL_ENCODING = "UTF-8";

    public static String encode(String value) throws UnsupportedEncodingException {
        return URLEncoder.encode(value, URL_ENCODING).replace("+", "%20");
    }

    public static String percentEncode(String value) throws UnsupportedEncodingException {
        return value != null ? URLEncoder.encode(value, URL_ENCODING).replace("+", "%20")
                .replace("*", "%2A").replace("%7E", "~") : null;
    }

    public static String hexEncode(byte[] raw) {
        if (raw == null) {
            return null;
        }
        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < raw.length; i++) {
            String hex = Integer.toHexString(raw[i] & 0xFF);
            if (hex.length() < 2) {
                sb.append(0);
            }
            sb.append(hex);
        }
        return sb.toString();
    }
}