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.net.URI;
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22 | import java.net.URISyntaxException;
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23 | import java.util.Collections;
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24 | import java.util.HashSet;
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25 | import java.util.Locale;
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26 | import java.util.Optional;
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27 | import java.util.Set;
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28 | import java.util.regex.Matcher;
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29 | import java.util.regex.Pattern;
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30 |
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31 | import org.openstreetmap.josm.tools.Logging;
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32 |
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33 | /**
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34 | * <p><b>URL Validation</b> routines.</p>
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35 | * Behavior of validation is modified by passing in options:
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36 | * <ul>
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37 | * <li>ALLOW_2_SLASHES - [FALSE] Allows double '/' characters in the path
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38 | * component.</li>
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39 | * <li>NO_FRAGMENT- [FALSE] By default fragments are allowed, if this option is
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40 | * included then fragments are flagged as illegal.</li>
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41 | * <li>ALLOW_ALL_SCHEMES - [FALSE] By default only http, https, and ftp are
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42 | * considered valid schemes. Enabling this option will let any scheme pass validation.</li>
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43 | * </ul>
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44 | *
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45 | * <p>Originally based in on php script by Debbie Dyer, validation.php v1.2b, Date: 03/07/02,
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46 | * http://javascript.internet.com. However, this validation now bears little resemblance
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47 | * to the php original.</p>
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48 | * <pre>
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49 | * Example of usage:
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50 | * Construct a UrlValidator with valid schemes of "http", and "https".
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51 | *
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52 | * String[] schemes = {"http","https"}.
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53 | * UrlValidator urlValidator = new UrlValidator(schemes);
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54 | * if (urlValidator.isValid("ftp://foo.bar.com/")) {
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55 | * System.out.println("url is valid");
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56 | * } else {
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57 | * System.out.println("url is invalid");
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58 | * }
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59 | *
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60 | * prints "url is invalid"
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61 | * If instead the default constructor is used.
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62 | *
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63 | * UrlValidator urlValidator = new UrlValidator();
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64 | * if (urlValidator.isValid("ftp://foo.bar.com/")) {
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65 | * System.out.println("url is valid");
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66 | * } else {
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67 | * System.out.println("url is invalid");
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68 | * }
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69 | *
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70 | * prints out "url is valid"
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71 | * </pre>
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72 | *
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73 | * @version $Revision: 1741724 $
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74 | * @see
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75 | * <a href="http://www.ietf.org/rfc/rfc2396.txt">
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76 | * Uniform Resource Identifiers (URI): Generic Syntax
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77 | * </a>
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78 | *
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79 | * @since Validator 1.4
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80 | */
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81 | public class UrlValidator extends AbstractValidator {
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82 |
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83 | /**
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84 | * Allows all validly formatted schemes to pass validation instead of
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85 | * supplying a set of valid schemes.
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86 | */
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87 | public static final long ALLOW_ALL_SCHEMES = 1 << 0;
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88 |
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89 | /**
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90 | * Allow two slashes in the path component of the URL.
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91 | */
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92 | public static final long ALLOW_2_SLASHES = 1 << 1;
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93 |
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94 | /**
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95 | * Enabling this options disallows any URL fragments.
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96 | */
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97 | public static final long NO_FRAGMENTS = 1 << 2;
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98 |
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99 | /**
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100 | * Allow local URLs, such as http://localhost/ or http://machine/ .
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101 | * This enables a broad-brush check, for complex local machine name
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102 | * validation requirements you should create your validator with
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103 | * a {@link RegexValidator} instead ({@link #UrlValidator(RegexValidator, long)})
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104 | */
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105 | public static final long ALLOW_LOCAL_URLS = 1 << 3; // CHECKSTYLE IGNORE MagicNumber
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106 |
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107 | /**
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108 | * This expression derived/taken from the BNF for URI (RFC2396).
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109 | */
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110 | private static final String URL_REGEX =
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111 | "^(([^:/?#]+):)?(//([^/?#]*))?([^?#]*)(\\?([^#]*))?(#(.*))?";
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112 | // 12 3 4 5 6 7 8 9
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113 | private static final Pattern URL_PATTERN = Pattern.compile(URL_REGEX);
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114 |
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115 | /**
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116 | * Schema/Protocol (ie. http:, ftp:, file:, etc).
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117 | */
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118 | private static final int PARSE_URL_SCHEME = 2;
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119 |
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120 | /**
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121 | * Includes hostname/ip and port number.
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122 | */
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123 | private static final int PARSE_URL_AUTHORITY = 4;
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124 |
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125 | private static final int PARSE_URL_PATH = 5;
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126 |
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127 | private static final int PARSE_URL_QUERY = 7;
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128 |
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129 | private static final int PARSE_URL_FRAGMENT = 9;
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130 |
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131 | /**
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132 | * Protocol scheme (e.g. http, ftp, https).
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133 | */
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134 | private static final String SCHEME_REGEX = "^\\p{Alpha}[\\p{Alnum}+\\-.]*";
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135 | private static final Pattern SCHEME_PATTERN = Pattern.compile(SCHEME_REGEX);
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136 |
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137 | // Drop numeric, and "+-." for now
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138 | // TODO does not allow for optional userinfo.
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139 | // Validation of character set is done by isValidAuthority
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140 | private static final String AUTHORITY_CHARS_REGEX = "\\p{Alnum}-\\."; // allows for IPV4 but not IPV6
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141 | private static final String IPV6_REGEX = "[0-9a-fA-F:]+"; // do this as separate match because : could cause ambiguity with port prefix
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142 |
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143 | // userinfo = *( unreserved / pct-encoded / sub-delims / ":" )
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144 | // unreserved = ALPHA / DIGIT / "-" / "." / "_" / "~"
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145 | // sub-delims = "!" / "$" / "&" / "'" / "(" / ")" / "*" / "+" / "," / ";" / "="
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146 | // We assume that password has the same valid chars as user info
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147 | private static final String USERINFO_CHARS_REGEX = "[a-zA-Z0-9%-._~!$&'()*+,;=]";
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148 | // since neither ':' nor '@' are allowed chars, we don't need to use non-greedy matching
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149 | private static final String USERINFO_FIELD_REGEX =
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150 | USERINFO_CHARS_REGEX + "+:" + // At least one character for the name
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151 | USERINFO_CHARS_REGEX + "*@"; // password may be absent
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152 | private static final String AUTHORITY_REGEX =
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153 | "(?:\\[("+IPV6_REGEX+")]|(?:(?:"+USERINFO_FIELD_REGEX+")?([" + AUTHORITY_CHARS_REGEX + "]*)))(:\\d*)?(.*)?";
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154 | // 1 e.g. user:pass@ 2 3 4
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155 | private static final Pattern AUTHORITY_PATTERN = Pattern.compile(AUTHORITY_REGEX);
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156 |
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157 | private static final int PARSE_AUTHORITY_IPV6 = 1;
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158 |
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159 | private static final int PARSE_AUTHORITY_HOST_IP = 2; // excludes userinfo, if present
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160 |
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161 | /**
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162 | * Should always be empty. The code currently allows spaces.
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163 | */
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164 | private static final int PARSE_AUTHORITY_EXTRA = 4;
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165 |
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166 | private static final String PATH_REGEX = "^(/[-\\w:@&?=+,.!/~*'%$_;()]*)?$";
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167 | private static final Pattern PATH_PATTERN = Pattern.compile(PATH_REGEX);
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168 |
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169 | private static final String QUERY_REGEX = "^(.*)$";
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170 | private static final Pattern QUERY_PATTERN = Pattern.compile(QUERY_REGEX);
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171 |
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172 | /**
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173 | * Holds the set of current validation options.
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174 | */
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175 | private final long options;
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176 |
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177 | /**
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178 | * The set of schemes that are allowed to be in a URL.
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179 | */
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180 | private final Set<String> allowedSchemes; // Must be lower-case
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181 |
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182 | /**
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183 | * Regular expressions used to manually validate authorities if IANA
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184 | * domain name validation isn't desired.
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185 | */
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186 | private final RegexValidator authorityValidator;
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187 |
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188 | /**
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189 | * If no schemes are provided, default to this set.
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190 | */
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191 | private static final String[] DEFAULT_SCHEMES = {"http", "https", "ftp"}; // Must be lower-case
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192 |
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193 | /**
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194 | * Singleton instance of this class with default schemes and options.
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195 | */
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196 | private static final UrlValidator DEFAULT_URL_VALIDATOR = new UrlValidator(UrlValidator.ALLOW_2_SLASHES);
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197 |
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198 | /**
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199 | * Returns the singleton instance of this class with default schemes and options.
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200 | * @return singleton instance with default schemes and options
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201 | */
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202 | public static UrlValidator getInstance() {
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203 | return DEFAULT_URL_VALIDATOR;
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204 | }
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205 |
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206 | /**
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207 | * Create a UrlValidator with default properties.
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208 | */
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209 | public UrlValidator() {
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210 | this((String[]) null);
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211 | }
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212 |
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213 | /**
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214 | * Behavior of validation is modified by passing in several strings options:
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215 | * @param schemes Pass in one or more url schemes to consider valid, passing in
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216 | * a null will default to "http,https,ftp" being valid.
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217 | * If a non-null schemes is specified then all valid schemes must
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218 | * be specified. Setting the ALLOW_ALL_SCHEMES option will
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219 | * ignore the contents of schemes.
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220 | */
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221 | public UrlValidator(String... schemes) {
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222 | this(schemes, 0L);
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223 | }
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224 |
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225 | /**
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226 | * Initialize a UrlValidator with the given validation options.
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227 | * @param options The options should be set using the public constants declared in
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228 | * this class. To set multiple options you simply add them together. For example,
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229 | * ALLOW_2_SLASHES + NO_FRAGMENTS enables both of those options.
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230 | */
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231 | public UrlValidator(long options) {
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232 | this(null, null, options);
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233 | }
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234 |
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235 | /**
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236 | * Behavior of validation is modified by passing in options:
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237 | * @param schemes The set of valid schemes. Ignored if the ALLOW_ALL_SCHEMES option is set.
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238 | * @param options The options should be set using the public constants declared in
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239 | * this class. To set multiple options you simply add them together. For example,
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240 | * ALLOW_2_SLASHES + NO_FRAGMENTS enables both of those options.
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241 | */
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242 | public UrlValidator(String[] schemes, long options) {
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243 | this(schemes, null, options);
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244 | }
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245 |
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246 | /**
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247 | * Initialize a UrlValidator with the given validation options.
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248 | * @param authorityValidator Regular expression validator used to validate the authority part
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249 | * This allows the user to override the standard set of domains.
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250 | * @param options Validation options. Set using the public constants of this class.
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251 | * To set multiple options, simply add them together:
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252 | * <p><code>ALLOW_2_SLASHES + NO_FRAGMENTS</code></p>
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253 | * enables both of those options.
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254 | */
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255 | public UrlValidator(RegexValidator authorityValidator, long options) {
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256 | this(null, authorityValidator, options);
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257 | }
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258 |
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259 | /**
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260 | * Customizable constructor. Validation behavior is modified by passing in options.
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261 | * @param schemes the set of valid schemes. Ignored if the ALLOW_ALL_SCHEMES option is set.
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262 | * @param authorityValidator Regular expression validator used to validate the authority part
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263 | * @param options Validation options. Set using the public constants of this class.
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264 | * To set multiple options, simply add them together:
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265 | * <p><code>ALLOW_2_SLASHES + NO_FRAGMENTS</code></p>
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266 | * enables both of those options.
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267 | */
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268 | public UrlValidator(String[] schemes, RegexValidator authorityValidator, long options) {
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269 | this.options = options;
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270 |
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271 | if (isOn(ALLOW_ALL_SCHEMES)) {
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272 | allowedSchemes = Collections.emptySet();
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273 | } else {
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274 | if (schemes == null) {
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275 | schemes = DEFAULT_SCHEMES;
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276 | }
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277 | allowedSchemes = new HashSet<>(schemes.length);
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278 | for (String scheme : schemes) {
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279 | allowedSchemes.add(scheme.toLowerCase(Locale.ENGLISH));
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280 | }
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281 | }
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282 |
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283 | this.authorityValidator = authorityValidator;
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284 | }
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285 |
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286 | /**
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287 | * <p>Checks if a field has a valid url address.</p>
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288 | *
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289 | * Note that the method calls #isValidAuthority()
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290 | * which checks that the domain is valid.
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291 | *
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292 | * @param value The value validation is being performed on. A <code>null</code>
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293 | * value is considered invalid.
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294 | * @return true if the url is valid.
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295 | */
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296 | @Override
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297 | public boolean isValid(String value) {
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298 | if (value == null) {
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299 | return false;
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300 | }
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301 |
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302 | // Check the whole url address structure
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303 | Matcher urlMatcher = URL_PATTERN.matcher(value);
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304 | if (!urlMatcher.matches()) {
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305 | setErrorMessage(tr("URL is invalid"));
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306 | return false;
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307 | }
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308 |
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309 | String scheme = urlMatcher.group(PARSE_URL_SCHEME);
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310 | if (!isValidScheme(scheme)) {
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311 | setErrorMessage(tr("URL contains an invalid protocol: {0}", scheme));
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312 | return false;
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313 | }
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314 |
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315 | String authority = urlMatcher.group(PARSE_URL_AUTHORITY);
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316 | if ("file".equals(scheme)) { // Special case - file: allows an empty authority
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317 | if (!"".equals(authority) && authority.contains(":")) { // but cannot allow trailing :
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318 | setErrorMessage(tr("URL contains an invalid authority: {0}", authority));
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319 | return false;
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320 | }
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321 | // drop through to continue validation
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322 | } else { // not file:
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323 | // Validate the authority
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324 | if (!isValidAuthority(authority)) {
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325 | setErrorMessage(tr("URL contains an invalid authority: {0}", authority));
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326 | return false;
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327 | }
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328 | }
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329 |
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330 | String path = urlMatcher.group(PARSE_URL_PATH);
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331 | if (!isValidPath(path)) {
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332 | setErrorMessage(tr("URL contains an invalid path: {0}", path));
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333 | return false;
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334 | }
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335 |
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336 | String query = urlMatcher.group(PARSE_URL_QUERY);
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337 | if (!isValidQuery(query)) {
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338 | setErrorMessage(tr("URL contains an invalid query: {0}", query));
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339 | return false;
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340 | }
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341 |
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342 | String fragment = urlMatcher.group(PARSE_URL_FRAGMENT);
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343 | if (!isValidFragment(fragment)) {
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344 | setErrorMessage(tr("URL contains an invalid fragment: {0}", fragment));
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345 | return false;
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346 | }
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347 |
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348 | return true;
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349 | }
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350 |
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351 | @Override
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352 | public String getValidatorName() {
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353 | return tr("URL validator");
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354 | }
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355 |
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356 | /**
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357 | * Validate scheme. If schemes[] was initialized to a non null,
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358 | * then only those schemes are allowed.
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359 | * Otherwise the default schemes are "http", "https", "ftp".
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360 | * Matching is case-blind.
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361 | * @param scheme The scheme to validate. A <code>null</code> value is considered
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362 | * invalid.
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363 | * @return true if valid.
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364 | */
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365 | protected boolean isValidScheme(String scheme) {
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366 | if (scheme == null) {
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367 | return false;
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368 | }
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369 |
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370 | // TODO could be removed if external schemes were checked in the ctor before being stored
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371 | if (!SCHEME_PATTERN.matcher(scheme).matches()) {
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372 | return false;
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373 | }
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374 |
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375 | return isOn(ALLOW_ALL_SCHEMES) || allowedSchemes.contains(scheme.toLowerCase(Locale.ENGLISH));
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376 | }
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377 |
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378 | /**
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379 | * Returns true if the authority is properly formatted. An authority is the combination
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380 | * of hostname and port. A <code>null</code> authority value is considered invalid.
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381 | * Note: this implementation validates the domain unless a RegexValidator was provided.
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382 | * If a RegexValidator was supplied and it matches, then the authority is regarded
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383 | * as valid with no further checks, otherwise the method checks against the
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384 | * AUTHORITY_PATTERN and the DomainValidator (ALLOW_LOCAL_URLS)
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385 | * @param authority Authority value to validate, alllows IDN
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386 | * @return true if authority (hostname and port) is valid.
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387 | */
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388 | protected boolean isValidAuthority(String authority) {
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389 | if (authority == null) {
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390 | return false;
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391 | }
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392 |
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393 | // check manual authority validation if specified
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394 | if (authorityValidator != null && authorityValidator.isValid(authority)) {
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395 | return true;
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396 | }
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397 | // convert to ASCII if possible
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398 | final String authorityASCII = DomainValidator.unicodeToASCII(authority);
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399 |
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400 | Matcher authorityMatcher = AUTHORITY_PATTERN.matcher(authorityASCII);
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401 | if (!authorityMatcher.matches()) {
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402 | return false;
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403 | }
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404 |
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405 | // We have to process IPV6 separately because that is parsed in a different group
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406 | String ipv6 = authorityMatcher.group(PARSE_AUTHORITY_IPV6);
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407 | if (ipv6 != null) {
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408 | InetAddressValidator inetAddressValidator = InetAddressValidator.getInstance();
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409 | if (!inetAddressValidator.isValidInet6Address(ipv6)) {
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410 | return false;
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411 | }
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412 | } else {
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413 | String hostLocation = authorityMatcher.group(PARSE_AUTHORITY_HOST_IP);
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414 | // check if authority is hostname or IP address:
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415 | // try a hostname first since that's much more likely
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416 | DomainValidator domainValidator = DomainValidator.getInstance(isOn(ALLOW_LOCAL_URLS));
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417 | if (!domainValidator.isValid(hostLocation)) {
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418 | // try an IPv4 address
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419 | InetAddressValidator inetAddressValidator = InetAddressValidator.getInstance();
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420 | if (!inetAddressValidator.isValidInet4Address(hostLocation)) {
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421 | // isn't IPv4, so the URL is invalid
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422 | return false;
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423 | }
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424 | }
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425 | }
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426 |
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427 | return Optional.ofNullable(authorityMatcher.group(PARSE_AUTHORITY_EXTRA)).orElse("").trim().isEmpty();
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428 | }
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429 |
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430 | /**
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431 | * Returns true if the path is valid. A <code>null</code> value is considered invalid.
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432 | * @param path Path value to validate.
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433 | * @return true if path is valid.
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434 | */
|
---|
435 | protected boolean isValidPath(String path) {
|
---|
436 | if (path == null) {
|
---|
437 | return false;
|
---|
438 | }
|
---|
439 |
|
---|
440 | if (!PATH_PATTERN.matcher(path).matches()) {
|
---|
441 | return false;
|
---|
442 | }
|
---|
443 |
|
---|
444 | try {
|
---|
445 | URI uri = new URI(null, null, path, null);
|
---|
446 | String norm = uri.normalize().getPath();
|
---|
447 | if (norm.startsWith("/../") // Trying to go via the parent dir
|
---|
448 | || "/..".equals(norm)) { // Trying to go to the parent dir
|
---|
449 | return false;
|
---|
450 | }
|
---|
451 | } catch (URISyntaxException e) {
|
---|
452 | Logging.trace(e);
|
---|
453 | return false;
|
---|
454 | }
|
---|
455 |
|
---|
456 | return isOn(ALLOW_2_SLASHES) || countToken("//", path) <= 0;
|
---|
457 | }
|
---|
458 |
|
---|
459 | /**
|
---|
460 | * Returns true if the query is null or it's a properly formatted query string.
|
---|
461 | * @param query Query value to validate.
|
---|
462 | * @return true if query is valid.
|
---|
463 | */
|
---|
464 | protected boolean isValidQuery(String query) {
|
---|
465 | if (query == null) {
|
---|
466 | return true;
|
---|
467 | }
|
---|
468 |
|
---|
469 | return QUERY_PATTERN.matcher(query).matches();
|
---|
470 | }
|
---|
471 |
|
---|
472 | /**
|
---|
473 | * Returns true if the given fragment is null or fragments are allowed.
|
---|
474 | * @param fragment Fragment value to validate.
|
---|
475 | * @return true if fragment is valid.
|
---|
476 | */
|
---|
477 | protected boolean isValidFragment(String fragment) {
|
---|
478 | if (fragment == null) {
|
---|
479 | return true;
|
---|
480 | }
|
---|
481 |
|
---|
482 | return isOff(NO_FRAGMENTS);
|
---|
483 | }
|
---|
484 |
|
---|
485 | /**
|
---|
486 | * Returns the number of times the token appears in the target.
|
---|
487 | * @param token Token value to be counted.
|
---|
488 | * @param target Target value to count tokens in.
|
---|
489 | * @return the number of tokens.
|
---|
490 | */
|
---|
491 | protected int countToken(String token, String target) {
|
---|
492 | int tokenIndex = 0;
|
---|
493 | int count = 0;
|
---|
494 | while (tokenIndex != -1) {
|
---|
495 | tokenIndex = target.indexOf(token, tokenIndex);
|
---|
496 | if (tokenIndex > -1) {
|
---|
497 | tokenIndex++;
|
---|
498 | count++;
|
---|
499 | }
|
---|
500 | }
|
---|
501 | return count;
|
---|
502 | }
|
---|
503 |
|
---|
504 | /**
|
---|
505 | * Tests whether the given flag is on. If the flag is not a power of 2
|
---|
506 | * (ie. 3) this tests whether the combination of flags is on.
|
---|
507 | *
|
---|
508 | * @param flag Flag value to check.
|
---|
509 | *
|
---|
510 | * @return whether the specified flag value is on.
|
---|
511 | */
|
---|
512 | private boolean isOn(long flag) {
|
---|
513 | return (options & flag) > 0;
|
---|
514 | }
|
---|
515 |
|
---|
516 | /**
|
---|
517 | * Tests whether the given flag is off. If the flag is not a power of 2
|
---|
518 | * (ie. 3) this tests whether the combination of flags is off.
|
---|
519 | *
|
---|
520 | * @param flag Flag value to check.
|
---|
521 | *
|
---|
522 | * @return whether the specified flag value is off.
|
---|
523 | */
|
---|
524 | private boolean isOff(long flag) {
|
---|
525 | return (options & flag) == 0;
|
---|
526 | }
|
---|
527 | }
|
---|