| /** |
| * 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 org.apache.camel.util; |
| |
| import java.io.UnsupportedEncodingException; |
| import java.util.BitSet; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| |
| /** |
| * Encoder for unsafe URI characters. |
| */ |
| public final class UnsafeUriCharactersEncoder { |
| private static BitSet unsafeCharacters; |
| private static final transient Log LOG = LogFactory.getLog(UnsafeUriCharactersEncoder.class); |
| private static final char[] HEX_DIGITS = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', |
| 'D', 'E', 'F'}; |
| |
| static { |
| unsafeCharacters = new BitSet(256); |
| unsafeCharacters.set(' '); |
| unsafeCharacters.set('"'); |
| unsafeCharacters.set('<'); |
| unsafeCharacters.set('>'); |
| unsafeCharacters.set('#'); |
| unsafeCharacters.set('%'); |
| unsafeCharacters.set('{'); |
| unsafeCharacters.set('}'); |
| unsafeCharacters.set('|'); |
| unsafeCharacters.set('\\'); |
| unsafeCharacters.set('^'); |
| unsafeCharacters.set('~'); |
| unsafeCharacters.set('['); |
| unsafeCharacters.set(']'); |
| unsafeCharacters.set('`'); |
| } |
| |
| private UnsafeUriCharactersEncoder() { |
| // util class |
| } |
| |
| public static String encode(String s) { |
| int n = s.length(); |
| if (n == 0) { |
| return s; |
| } |
| |
| try { |
| // First check whether we actually need to encode |
| byte[] bytes = s.getBytes("UTF8"); |
| for (int i = 0;;) { |
| if (unsafeCharacters.get(bytes[i])) { |
| break; |
| } |
| if (++i >= bytes.length) { |
| return s; |
| } |
| } |
| |
| // okay there are some unsafe characters so we do need to encode |
| StringBuffer sb = new StringBuffer(); |
| for (byte b : bytes) { |
| if (unsafeCharacters.get(b)) { |
| appendEscape(sb, b); |
| } else { |
| sb.append((char)b); |
| } |
| } |
| return sb.toString(); |
| } catch (UnsupportedEncodingException e) { |
| LOG.error("Can't encoding the uri: ", e); |
| return null; |
| } |
| } |
| |
| private static void appendEscape(StringBuffer sb, byte b) { |
| sb.append('%'); |
| sb.append(HEX_DIGITS[(b >> 4) & 0x0f]); |
| sb.append(HEX_DIGITS[(b >> 0) & 0x0f]); |
| } |
| |
| } |