1 | /*
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2 | * Licensed to the Apache Software Foundation (ASF) under one or more
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3 | * contributor license agreements. See the NOTICE file distributed with
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4 | * this work for additional information regarding copyright ownership.
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5 | * The ASF licenses this file to You under the Apache License, Version 2.0
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6 | * (the "License"); you may not use this file except in compliance with
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7 | * the License. You may obtain a copy of the License at
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8 | *
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9 | * http://www.apache.org/licenses/LICENSE-2.0
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10 | *
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11 | * Unless required by applicable law or agreed to in writing, software
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12 | * distributed under the License is distributed on an "AS IS" BASIS,
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13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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14 | * See the License for the specific language governing permissions and
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15 | * limitations under the License.
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16 | */
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17 | package org.openstreetmap.josm.data.validation.routines;
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18 |
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19 | import static org.openstreetmap.josm.tools.I18n.tr;
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20 |
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21 | import java.util.Arrays;
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22 | import java.util.Collections;
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23 | import java.util.HashSet;
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24 | import java.util.Set;
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25 | import java.util.regex.Matcher;
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26 | import java.util.regex.Pattern;
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27 |
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28 | /**
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29 | * <p><b>URL Validation</b> routines.</p>
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30 | * Behavior of validation is modified by passing in options:
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31 | * <li>ALLOW_2_SLASHES - [FALSE] Allows double '/' characters in the path
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32 | * component.</li>
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33 | * <li>NO_FRAGMENT- [FALSE] By default fragments are allowed, if this option is
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34 | * included then fragments are flagged as illegal.</li>
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35 | * <li>ALLOW_ALL_SCHEMES - [FALSE] By default only http, https, and ftp are
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36 | * considered valid schemes. Enabling this option will let any scheme pass validation.</li>
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37 | *
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38 | * <p>Originally based in on php script by Debbie Dyer, validation.php v1.2b, Date: 03/07/02,
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39 | * http://javascript.internet.com. However, this validation now bears little resemblance
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40 | * to the php original.</p>
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41 | * <pre>
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42 | * Example of usage:
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43 | * Construct a UrlValidator with valid schemes of "http", and "https".
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44 | *
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45 | * String[] schemes = {"http","https"}.
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46 | * UrlValidator urlValidator = new UrlValidator(schemes);
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47 | * if (urlValidator.isValid("ftp://foo.bar.com/")) {
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48 | * System.out.println("url is valid");
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49 | * } else {
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50 | * System.out.println("url is invalid");
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51 | * }
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52 | *
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53 | * prints "url is invalid"
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54 | * If instead the default constructor is used.
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55 | *
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56 | * UrlValidator urlValidator = new UrlValidator();
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57 | * if (urlValidator.isValid("ftp://foo.bar.com/")) {
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58 | * System.out.println("url is valid");
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59 | * } else {
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60 | * System.out.println("url is invalid");
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61 | * }
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62 | *
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63 | * prints out "url is valid"
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64 | * </pre>
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65 | *
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66 | * @see
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67 | * <a href="http://www.ietf.org/rfc/rfc2396.txt">
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68 | * Uniform Resource Identifiers (URI): Generic Syntax
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69 | * </a>
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70 | *
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71 | * @version $Revision: 1227719 $ $Date: 2012-01-05 18:45:51 +0100 (Thu, 05 Jan 2012) $
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72 | * @since Validator 1.4
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73 | */
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74 | public class UrlValidator extends AbstractValidator {
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75 |
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76 | /**
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77 | * Allows all validly formatted schemes to pass validation instead of
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78 | * supplying a set of valid schemes.
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79 | */
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80 | public static final long ALLOW_ALL_SCHEMES = 1 << 0;
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81 |
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82 | /**
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83 | * Allow two slashes in the path component of the URL.
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84 | */
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85 | public static final long ALLOW_2_SLASHES = 1 << 1;
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86 |
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87 | /**
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88 | * Enabling this options disallows any URL fragments.
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89 | */
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90 | public static final long NO_FRAGMENTS = 1 << 2;
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91 |
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92 | /**
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93 | * Allow local URLs, such as http://localhost/ or http://machine/ .
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94 | * This enables a broad-brush check, for complex local machine name
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95 | * validation requirements you should create your validator with
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96 | * a {@link RegexValidator} instead ({@link #UrlValidator(RegexValidator, long)})
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97 | */
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98 | public static final long ALLOW_LOCAL_URLS = 1 << 3;
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99 |
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100 | // Drop numeric, and "+-." for now
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101 | private static final String AUTHORITY_CHARS_REGEX = "\\p{Alnum}\\-\\.";
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102 |
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103 | /**
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104 | * This expression derived/taken from the BNF for URI (RFC2396).
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105 | */
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106 | private static final String URL_REGEX =
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107 | "^(([^:/?#]+):)?(//([^/?#]*))?([^?#]*)(\\?([^#]*))?(#(.*))?";
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108 |
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109 | private static final Pattern URL_PATTERN = Pattern.compile(URL_REGEX);
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110 |
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111 | /**
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112 | * Schema/Protocol (ie. http:, ftp:, file:, etc).
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113 | */
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114 | private static final int PARSE_URL_SCHEME = 2;
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115 |
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116 | /**
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117 | * Includes hostname/ip and port number.
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118 | */
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119 | private static final int PARSE_URL_AUTHORITY = 4;
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120 |
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121 | private static final int PARSE_URL_PATH = 5;
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122 |
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123 | private static final int PARSE_URL_QUERY = 7;
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124 |
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125 | private static final int PARSE_URL_FRAGMENT = 9;
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126 |
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127 | /**
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128 | * Protocol (ie. http:, ftp:,https:).
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129 | */
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130 | private static final String SCHEME_REGEX = "^\\p{Alpha}[\\p{Alnum}\\+\\-\\.]*";
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131 | private static final Pattern SCHEME_PATTERN = Pattern.compile(SCHEME_REGEX);
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132 |
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133 | private static final String AUTHORITY_REGEX =
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134 | "^([" + AUTHORITY_CHARS_REGEX + "]*)(:\\d*)?(.*)?";
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135 |
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136 | private static final Pattern AUTHORITY_PATTERN = Pattern.compile(AUTHORITY_REGEX);
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137 |
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138 | private static final int PARSE_AUTHORITY_HOST_IP = 1;
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139 |
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140 | private static final int PARSE_AUTHORITY_PORT = 2;
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141 |
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142 | /**
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143 | * Should always be empty.
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144 | */
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145 | private static final int PARSE_AUTHORITY_EXTRA = 3;
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146 |
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147 | private static final String PATH_REGEX = "^(/[-\\w:@&?=+,.!/~*'%$_;\\(\\)]*)?$";
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148 | private static final Pattern PATH_PATTERN = Pattern.compile(PATH_REGEX);
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149 |
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150 | private static final String QUERY_REGEX = "^(.*)$";
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151 | private static final Pattern QUERY_PATTERN = Pattern.compile(QUERY_REGEX);
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152 |
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153 | private static final String LEGAL_ASCII_REGEX = "^\\p{ASCII}+$";
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154 | private static final Pattern ASCII_PATTERN = Pattern.compile(LEGAL_ASCII_REGEX);
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155 |
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156 | private static final String PORT_REGEX = "^:(\\d{1,5})$";
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157 | private static final Pattern PORT_PATTERN = Pattern.compile(PORT_REGEX);
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158 |
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159 | /**
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160 | * Holds the set of current validation options.
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161 | */
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162 | private final long options;
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163 |
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164 | /**
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165 | * The set of schemes that are allowed to be in a URL.
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166 | */
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167 | private final Set<String> allowedSchemes;
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168 |
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169 | /**
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170 | * Regular expressions used to manually validate authorities if IANA
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171 | * domain name validation isn't desired.
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172 | */
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173 | private final RegexValidator authorityValidator;
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174 |
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175 | /**
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176 | * If no schemes are provided, default to this set.
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177 | */
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178 | private static final String[] DEFAULT_SCHEMES = {"http", "https", "ftp"};
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179 |
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180 | /**
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181 | * Singleton instance of this class with default schemes and options.
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182 | */
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183 | private static final UrlValidator DEFAULT_URL_VALIDATOR = new UrlValidator();
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184 |
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185 | /**
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186 | * Returns the singleton instance of this class with default schemes and options.
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187 | * @return singleton instance with default schemes and options
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188 | */
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189 | public static UrlValidator getInstance() {
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190 | return DEFAULT_URL_VALIDATOR;
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191 | }
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192 |
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193 | /**
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194 | * Create a UrlValidator with default properties.
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195 | */
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196 | public UrlValidator() {
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197 | this(null);
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198 | }
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199 |
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200 | /**
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201 | * Behavior of validation is modified by passing in several strings options:
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202 | * @param schemes Pass in one or more url schemes to consider valid, passing in
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203 | * a null will default to "http,https,ftp" being valid.
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204 | * If a non-null schemes is specified then all valid schemes must
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205 | * be specified. Setting the ALLOW_ALL_SCHEMES option will
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206 | * ignore the contents of schemes.
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207 | */
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208 | public UrlValidator(String[] schemes) {
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209 | this(schemes, 0L);
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210 | }
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211 |
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212 | /**
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213 | * Initialize a UrlValidator with the given validation options.
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214 | * @param options The options should be set using the public constants declared in
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215 | * this class. To set multiple options you simply add them together. For example,
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216 | * ALLOW_2_SLASHES + NO_FRAGMENTS enables both of those options.
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217 | */
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218 | public UrlValidator(long options) {
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219 | this(null, null, options);
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220 | }
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221 |
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222 | /**
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223 | * Behavior of validation is modified by passing in options:
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224 | * @param schemes The set of valid schemes.
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225 | * @param options The options should be set using the public constants declared in
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226 | * this class. To set multiple options you simply add them together. For example,
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227 | * ALLOW_2_SLASHES + NO_FRAGMENTS enables both of those options.
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228 | */
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229 | public UrlValidator(String[] schemes, long options) {
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230 | this(schemes, null, options);
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231 | }
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232 |
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233 | /**
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234 | * Initialize a UrlValidator with the given validation options.
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235 | * @param authorityValidator Regular expression validator used to validate the authority part
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236 | * @param options Validation options. Set using the public constants of this class.
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237 | * To set multiple options, simply add them together:
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238 | * <p><code>ALLOW_2_SLASHES + NO_FRAGMENTS</code></p>
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239 | * enables both of those options.
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240 | */
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241 | public UrlValidator(RegexValidator authorityValidator, long options) {
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242 | this(null, authorityValidator, options);
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243 | }
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244 |
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245 | /**
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246 | * Customizable constructor. Validation behavior is modifed by passing in options.
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247 | * @param schemes the set of valid schemes
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248 | * @param authorityValidator Regular expression validator used to validate the authority part
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249 | * @param options Validation options. Set using the public constants of this class.
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250 | * To set multiple options, simply add them together:
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251 | * <p><code>ALLOW_2_SLASHES + NO_FRAGMENTS</code></p>
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252 | * enables both of those options.
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253 | */
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254 | public UrlValidator(String[] schemes, RegexValidator authorityValidator, long options) {
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255 | this.options = options;
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256 |
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257 | if (isOn(ALLOW_ALL_SCHEMES)) {
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258 | this.allowedSchemes = Collections.emptySet();
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259 | } else {
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260 | if (schemes == null) {
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261 | schemes = DEFAULT_SCHEMES;
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262 | }
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263 | this.allowedSchemes = new HashSet<>();
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264 | this.allowedSchemes.addAll(Arrays.asList(schemes));
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265 | }
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266 |
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267 | this.authorityValidator = authorityValidator;
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268 |
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269 | }
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270 |
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271 | /**
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272 | * <p>Checks if a field has a valid url address.</p>
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273 | *
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274 | * @param value The value validation is being performed on. A <code>null</code>
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275 | * value is considered invalid.
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276 | * @return true if the url is valid.
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277 | */
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278 | @Override
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279 | public boolean isValid(String value) {
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280 | if (value == null) {
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281 | return false;
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282 | }
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283 |
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284 | if (!ASCII_PATTERN.matcher(value).matches()) {
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285 | setErrorMessage(tr("URL contains non-ascii characters"));
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286 | setFix(value.replaceAll("[^\\p{ASCII}]+", ""));
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287 | return false;
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288 | }
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289 |
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290 | // Check the whole url address structure
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291 | Matcher urlMatcher = URL_PATTERN.matcher(value);
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292 | if (!urlMatcher.matches()) {
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293 | setErrorMessage(tr("URL is invalid"));
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294 | return false;
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295 | }
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296 |
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297 | String scheme = urlMatcher.group(PARSE_URL_SCHEME);
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298 | if (!isValidScheme(scheme)) {
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299 | setErrorMessage(tr("URL contains an invalid protocol: {0}", scheme));
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300 | return false;
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301 | }
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302 |
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303 | String authority = urlMatcher.group(PARSE_URL_AUTHORITY);
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304 | if ("file".equals(scheme) && "".equals(authority)) {
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305 | // Special case - file: allows an empty authority
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306 | } else {
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307 | // Validate the authority
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308 | if (!isValidAuthority(authority)) {
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309 | setErrorMessage(tr("URL contains an invalid authority: {0}", authority));
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310 | return false;
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311 | }
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312 | }
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313 |
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314 | String path = urlMatcher.group(PARSE_URL_PATH);
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315 | if (!isValidPath(path)) {
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316 | setErrorMessage(tr("URL contains an invalid path: {0}", path));
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317 | return false;
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318 | }
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319 |
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320 | String query = urlMatcher.group(PARSE_URL_QUERY);
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321 | if (!isValidQuery(query)) {
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322 | setErrorMessage(tr("URL contains an invalid query: {0}", query));
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323 | return false;
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324 | }
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325 |
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326 | String fragment = urlMatcher.group(PARSE_URL_FRAGMENT);
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327 | if (!isValidFragment(fragment)) {
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328 | setErrorMessage(tr("URL contains an invalid fragment: {0}", fragment));
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329 | return false;
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330 | }
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331 |
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332 | return true;
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333 | }
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334 |
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335 | /**
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336 | * Validate scheme. If schemes[] was initialized to a non null,
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337 | * then only those scheme's are allowed. Note this is slightly different
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338 | * than for the constructor.
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339 | * @param scheme The scheme to validate. A <code>null</code> value is considered
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340 | * invalid.
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341 | * @return true if valid.
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342 | */
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343 | protected boolean isValidScheme(String scheme) {
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344 | if (scheme == null) {
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345 | return false;
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346 | }
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347 |
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348 | if (!SCHEME_PATTERN.matcher(scheme).matches()) {
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349 | return false;
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350 | }
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351 |
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352 | if (isOff(ALLOW_ALL_SCHEMES)) {
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353 |
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354 | if (!this.allowedSchemes.contains(scheme)) {
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355 | return false;
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356 | }
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357 | }
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358 |
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359 | return true;
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360 | }
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361 |
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362 | /**
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363 | * Returns true if the authority is properly formatted. An authority is the combination
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364 | * of hostname and port. A <code>null</code> authority value is considered invalid.
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365 | * @param authority Authority value to validate.
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366 | * @return true if authority (hostname and port) is valid.
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367 | */
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368 | protected boolean isValidAuthority(String authority) {
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369 | if (authority == null) {
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370 | return false;
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371 | }
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372 |
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373 | // check manual authority validation if specified
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374 | if (authorityValidator != null) {
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375 | if (authorityValidator.isValid(authority)) {
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376 | return true;
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377 | }
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378 | }
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379 |
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380 | Matcher authorityMatcher = AUTHORITY_PATTERN.matcher(authority);
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381 | if (!authorityMatcher.matches()) {
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382 | return false;
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383 | }
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384 |
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385 | String hostLocation = authorityMatcher.group(PARSE_AUTHORITY_HOST_IP);
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386 | // check if authority is hostname or IP address:
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387 | // try a hostname first since that's much more likely
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388 | DomainValidator domainValidator = DomainValidator.getInstance(isOn(ALLOW_LOCAL_URLS));
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389 | if (!domainValidator.isValid(hostLocation)) {
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390 | // try an IP address
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391 | InetAddressValidator inetAddressValidator =
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392 | InetAddressValidator.getInstance();
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393 | if (!inetAddressValidator.isValid(hostLocation)) {
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394 | // isn't either one, so the URL is invalid
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395 | return false;
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396 | }
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397 | }
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398 |
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399 | String port = authorityMatcher.group(PARSE_AUTHORITY_PORT);
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400 | if (port != null) {
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401 | if (!PORT_PATTERN.matcher(port).matches()) {
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402 | return false;
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403 | }
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404 | }
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405 |
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406 | String extra = authorityMatcher.group(PARSE_AUTHORITY_EXTRA);
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407 | if (extra != null && extra.trim().length() > 0){
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408 | return false;
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409 | }
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410 |
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411 | return true;
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412 | }
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413 |
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414 | /**
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415 | * Returns true if the path is valid. A <code>null</code> value is considered invalid.
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416 | * @param path Path value to validate.
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417 | * @return true if path is valid.
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418 | */
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419 | protected boolean isValidPath(String path) {
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420 | if (path == null) {
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421 | return false;
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422 | }
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423 |
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424 | if (!PATH_PATTERN.matcher(path).matches()) {
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425 | return false;
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426 | }
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427 |
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428 | int slash2Count = countToken("//", path);
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429 | if (isOff(ALLOW_2_SLASHES) && (slash2Count > 0)) {
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430 | return false;
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431 | }
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432 |
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433 | int slashCount = countToken("/", path);
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434 | int dot2Count = countToken("..", path);
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435 | if (dot2Count > 0) {
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436 | if ((slashCount - slash2Count - 1) <= dot2Count) {
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437 | return false;
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438 | }
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439 | }
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440 |
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441 | return true;
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442 | }
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443 |
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444 | /**
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445 | * Returns true if the query is null or it's a properly formatted query string.
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446 | * @param query Query value to validate.
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447 | * @return true if query is valid.
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448 | */
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449 | protected boolean isValidQuery(String query) {
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450 | if (query == null) {
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451 | return true;
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452 | }
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453 |
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454 | return QUERY_PATTERN.matcher(query).matches();
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455 | }
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456 |
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457 | /**
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458 | * Returns true if the given fragment is null or fragments are allowed.
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459 | * @param fragment Fragment value to validate.
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460 | * @return true if fragment is valid.
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461 | */
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462 | protected boolean isValidFragment(String fragment) {
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463 | if (fragment == null) {
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464 | return true;
|
---|
465 | }
|
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466 |
|
---|
467 | return isOff(NO_FRAGMENTS);
|
---|
468 | }
|
---|
469 |
|
---|
470 | /**
|
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471 | * Returns the number of times the token appears in the target.
|
---|
472 | * @param token Token value to be counted.
|
---|
473 | * @param target Target value to count tokens in.
|
---|
474 | * @return the number of tokens.
|
---|
475 | */
|
---|
476 | protected int countToken(String token, String target) {
|
---|
477 | int tokenIndex = 0;
|
---|
478 | int count = 0;
|
---|
479 | while (tokenIndex != -1) {
|
---|
480 | tokenIndex = target.indexOf(token, tokenIndex);
|
---|
481 | if (tokenIndex > -1) {
|
---|
482 | tokenIndex++;
|
---|
483 | count++;
|
---|
484 | }
|
---|
485 | }
|
---|
486 | return count;
|
---|
487 | }
|
---|
488 |
|
---|
489 | /**
|
---|
490 | * Tests whether the given flag is on. If the flag is not a power of 2
|
---|
491 | * (ie. 3) this tests whether the combination of flags is on.
|
---|
492 | *
|
---|
493 | * @param flag Flag value to check.
|
---|
494 | *
|
---|
495 | * @return whether the specified flag value is on.
|
---|
496 | */
|
---|
497 | private boolean isOn(long flag) {
|
---|
498 | return (this.options & flag) > 0;
|
---|
499 | }
|
---|
500 |
|
---|
501 | /**
|
---|
502 | * Tests whether the given flag is off. If the flag is not a power of 2
|
---|
503 | * (ie. 3) this tests whether the combination of flags is off.
|
---|
504 | *
|
---|
505 | * @param flag Flag value to check.
|
---|
506 | *
|
---|
507 | * @return whether the specified flag value is off.
|
---|
508 | */
|
---|
509 | private boolean isOff(long flag) {
|
---|
510 | return (this.options & flag) == 0;
|
---|
511 | }
|
---|
512 | }
|
---|