source: josm/trunk/src/org/openstreetmap/josm/data/validation/routines/UrlValidator.java

Last change on this file was 18896, checked in by taylor.smock, 2 years ago

Fix #23235: Revert r18869

The URI specification only allows for ascii characters.
See ​https://datatracker.ietf.org/doc/html/rfc3986#section-1.2.1.
  • Property svn:eol-style set to native
File size: 19.3 KB
Line 
1/*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17package org.openstreetmap.josm.data.validation.routines;
18
19import static org.openstreetmap.josm.tools.I18n.tr;
20
21import java.net.URI;
22import java.net.URISyntaxException;
23import java.util.Collections;
24import java.util.HashSet;
25import java.util.Locale;
26import java.util.Optional;
27import java.util.Set;
28import java.util.regex.Matcher;
29import java.util.regex.Pattern;
30
31import org.openstreetmap.josm.tools.Logging;
32
33/**
34 * <p><b>URL Validation</b> routines.</p>
35 * Behavior of validation is modified by passing in options:
36 * <ul>
37 * <li>ALLOW_2_SLASHES - [FALSE] Allows double '/' characters in the path
38 * component.</li>
39 * <li>NO_FRAGMENT- [FALSE] By default fragments are allowed, if this option is
40 * included then fragments are flagged as illegal.</li>
41 * <li>ALLOW_ALL_SCHEMES - [FALSE] By default only http, https, and ftp are
42 * considered valid schemes. Enabling this option will let any scheme pass validation.</li>
43 * </ul>
44 *
45 * <p>Originally based in on php script by Debbie Dyer, validation.php v1.2b, Date: 03/07/02,
46 * http://javascript.internet.com. However, this validation now bears little resemblance
47 * to the php original.</p>
48 * <pre>
49 * Example of usage:
50 * Construct a UrlValidator with valid schemes of "http", and "https".
51 *
52 * String[] schemes = {"http","https"}.
53 * UrlValidator urlValidator = new UrlValidator(schemes);
54 * if (urlValidator.isValid("ftp://foo.bar.com/")) {
55 * System.out.println("url is valid");
56 * } else {
57 * System.out.println("url is invalid");
58 * }
59 *
60 * prints "url is invalid"
61 * If instead the default constructor is used.
62 *
63 * UrlValidator urlValidator = new UrlValidator();
64 * if (urlValidator.isValid("ftp://foo.bar.com/")) {
65 * System.out.println("url is valid");
66 * } else {
67 * System.out.println("url is invalid");
68 * }
69 *
70 * prints out "url is valid"
71 * </pre>
72 *
73 * @version $Revision: 1741724 $
74 * @see
75 * <a href="http://www.ietf.org/rfc/rfc2396.txt">
76 * Uniform Resource Identifiers (URI): Generic Syntax
77 * </a>
78 *
79 * @since Validator 1.4
80 */
81public class UrlValidator extends AbstractValidator {
82
83 /**
84 * Allows all validly formatted schemes to pass validation instead of
85 * supplying a set of valid schemes.
86 */
87 public static final long ALLOW_ALL_SCHEMES = 1 << 0;
88
89 /**
90 * Allow two slashes in the path component of the URL.
91 */
92 public static final long ALLOW_2_SLASHES = 1 << 1;
93
94 /**
95 * Enabling this options disallows any URL fragments.
96 */
97 public static final long NO_FRAGMENTS = 1 << 2;
98
99 /**
100 * Allow local URLs, such as http://localhost/ or http://machine/ .
101 * This enables a broad-brush check, for complex local machine name
102 * validation requirements you should create your validator with
103 * a {@link RegexValidator} instead ({@link #UrlValidator(RegexValidator, long)})
104 */
105 public static final long ALLOW_LOCAL_URLS = 1 << 3; // CHECKSTYLE IGNORE MagicNumber
106
107 /**
108 * This expression derived/taken from the BNF for URI (RFC2396).
109 */
110 private static final String URL_REGEX =
111 "^(([^:/?#]+):)?(//([^/?#]*))?([^?#]*)(\\?([^#]*))?(#(.*))?";
112 // 12 3 4 5 6 7 8 9
113 private static final Pattern URL_PATTERN = Pattern.compile(URL_REGEX);
114
115 /**
116 * Schema/Protocol (ie. http:, ftp:, file:, etc).
117 */
118 private static final int PARSE_URL_SCHEME = 2;
119
120 /**
121 * Includes hostname/ip and port number.
122 */
123 private static final int PARSE_URL_AUTHORITY = 4;
124
125 private static final int PARSE_URL_PATH = 5;
126
127 private static final int PARSE_URL_QUERY = 7;
128
129 private static final int PARSE_URL_FRAGMENT = 9;
130
131 /**
132 * Protocol scheme (e.g. http, ftp, https).
133 */
134 private static final String SCHEME_REGEX = "^\\p{Alpha}[\\p{Alnum}+\\-.]*";
135 private static final Pattern SCHEME_PATTERN = Pattern.compile(SCHEME_REGEX);
136
137 // Drop numeric, and "+-." for now
138 // TODO does not allow for optional userinfo.
139 // Validation of character set is done by isValidAuthority
140 private static final String AUTHORITY_CHARS_REGEX = "\\p{Alnum}-\\."; // allows for IPV4 but not IPV6
141 private static final String IPV6_REGEX = "[0-9a-fA-F:]+"; // do this as separate match because : could cause ambiguity with port prefix
142
143 // userinfo = *( unreserved / pct-encoded / sub-delims / ":" )
144 // unreserved = ALPHA / DIGIT / "-" / "." / "_" / "~"
145 // sub-delims = "!" / "$" / "&" / "'" / "(" / ")" / "*" / "+" / "," / ";" / "="
146 // We assume that password has the same valid chars as user info
147 private static final String USERINFO_CHARS_REGEX = "[a-zA-Z0-9%-._~!$&'()*+,;=]";
148 // since neither ':' nor '@' are allowed chars, we don't need to use non-greedy matching
149 private static final String USERINFO_FIELD_REGEX =
150 USERINFO_CHARS_REGEX + "+:" + // At least one character for the name
151 USERINFO_CHARS_REGEX + "*@"; // password may be absent
152 private static final String AUTHORITY_REGEX =
153 "(?:\\[("+IPV6_REGEX+")]|(?:(?:"+USERINFO_FIELD_REGEX+")?([" + AUTHORITY_CHARS_REGEX + "]*)))(:\\d*)?(.*)?";
154 // 1 e.g. user:pass@ 2 3 4
155 private static final Pattern AUTHORITY_PATTERN = Pattern.compile(AUTHORITY_REGEX);
156
157 private static final int PARSE_AUTHORITY_IPV6 = 1;
158
159 private static final int PARSE_AUTHORITY_HOST_IP = 2; // excludes userinfo, if present
160
161 /**
162 * Should always be empty. The code currently allows spaces.
163 */
164 private static final int PARSE_AUTHORITY_EXTRA = 4;
165
166 private static final String PATH_REGEX = "^(/[-\\w:@&?=+,.!/~*'%$_;()]*)?$";
167 private static final Pattern PATH_PATTERN = Pattern.compile(PATH_REGEX);
168
169 private static final String QUERY_REGEX = "^(.*)$";
170 private static final Pattern QUERY_PATTERN = Pattern.compile(QUERY_REGEX);
171
172 /**
173 * Holds the set of current validation options.
174 */
175 private final long options;
176
177 /**
178 * The set of schemes that are allowed to be in a URL.
179 */
180 private final Set<String> allowedSchemes; // Must be lower-case
181
182 /**
183 * Regular expressions used to manually validate authorities if IANA
184 * domain name validation isn't desired.
185 */
186 private final RegexValidator authorityValidator;
187
188 /**
189 * If no schemes are provided, default to this set.
190 */
191 private static final String[] DEFAULT_SCHEMES = {"http", "https", "ftp"}; // Must be lower-case
192
193 /**
194 * Singleton instance of this class with default schemes and options.
195 */
196 private static final UrlValidator DEFAULT_URL_VALIDATOR = new UrlValidator(UrlValidator.ALLOW_2_SLASHES);
197
198 /**
199 * Returns the singleton instance of this class with default schemes and options.
200 * @return singleton instance with default schemes and options
201 */
202 public static UrlValidator getInstance() {
203 return DEFAULT_URL_VALIDATOR;
204 }
205
206 /**
207 * Create a UrlValidator with default properties.
208 */
209 public UrlValidator() {
210 this((String[]) null);
211 }
212
213 /**
214 * Behavior of validation is modified by passing in several strings options:
215 * @param schemes Pass in one or more url schemes to consider valid, passing in
216 * a null will default to "http,https,ftp" being valid.
217 * If a non-null schemes is specified then all valid schemes must
218 * be specified. Setting the ALLOW_ALL_SCHEMES option will
219 * ignore the contents of schemes.
220 */
221 public UrlValidator(String... schemes) {
222 this(schemes, 0L);
223 }
224
225 /**
226 * Initialize a UrlValidator with the given validation options.
227 * @param options The options should be set using the public constants declared in
228 * this class. To set multiple options you simply add them together. For example,
229 * ALLOW_2_SLASHES + NO_FRAGMENTS enables both of those options.
230 */
231 public UrlValidator(long options) {
232 this(null, null, options);
233 }
234
235 /**
236 * Behavior of validation is modified by passing in options:
237 * @param schemes The set of valid schemes. Ignored if the ALLOW_ALL_SCHEMES option is set.
238 * @param options The options should be set using the public constants declared in
239 * this class. To set multiple options you simply add them together. For example,
240 * ALLOW_2_SLASHES + NO_FRAGMENTS enables both of those options.
241 */
242 public UrlValidator(String[] schemes, long options) {
243 this(schemes, null, options);
244 }
245
246 /**
247 * Initialize a UrlValidator with the given validation options.
248 * @param authorityValidator Regular expression validator used to validate the authority part
249 * This allows the user to override the standard set of domains.
250 * @param options Validation options. Set using the public constants of this class.
251 * To set multiple options, simply add them together:
252 * <p><code>ALLOW_2_SLASHES + NO_FRAGMENTS</code></p>
253 * enables both of those options.
254 */
255 public UrlValidator(RegexValidator authorityValidator, long options) {
256 this(null, authorityValidator, options);
257 }
258
259 /**
260 * Customizable constructor. Validation behavior is modified by passing in options.
261 * @param schemes the set of valid schemes. Ignored if the ALLOW_ALL_SCHEMES option is set.
262 * @param authorityValidator Regular expression validator used to validate the authority part
263 * @param options Validation options. Set using the public constants of this class.
264 * To set multiple options, simply add them together:
265 * <p><code>ALLOW_2_SLASHES + NO_FRAGMENTS</code></p>
266 * enables both of those options.
267 */
268 public UrlValidator(String[] schemes, RegexValidator authorityValidator, long options) {
269 this.options = options;
270
271 if (isOn(ALLOW_ALL_SCHEMES)) {
272 allowedSchemes = Collections.emptySet();
273 } else {
274 if (schemes == null) {
275 schemes = DEFAULT_SCHEMES;
276 }
277 allowedSchemes = new HashSet<>(schemes.length);
278 for (String scheme : schemes) {
279 allowedSchemes.add(scheme.toLowerCase(Locale.ENGLISH));
280 }
281 }
282
283 this.authorityValidator = authorityValidator;
284 }
285
286 /**
287 * <p>Checks if a field has a valid url address.</p>
288 *
289 * Note that the method calls #isValidAuthority()
290 * which checks that the domain is valid.
291 *
292 * @param value The value validation is being performed on. A <code>null</code>
293 * value is considered invalid.
294 * @return true if the url is valid.
295 */
296 @Override
297 public boolean isValid(String value) {
298 if (value == null) {
299 return false;
300 }
301
302 // Check the whole url address structure
303 Matcher urlMatcher = URL_PATTERN.matcher(value);
304 if (!urlMatcher.matches()) {
305 setErrorMessage(tr("URL is invalid"));
306 return false;
307 }
308
309 String scheme = urlMatcher.group(PARSE_URL_SCHEME);
310 if (!isValidScheme(scheme)) {
311 setErrorMessage(tr("URL contains an invalid protocol: {0}", scheme));
312 return false;
313 }
314
315 String authority = urlMatcher.group(PARSE_URL_AUTHORITY);
316 if ("file".equals(scheme)) { // Special case - file: allows an empty authority
317 if (!"".equals(authority) && authority.contains(":")) { // but cannot allow trailing :
318 setErrorMessage(tr("URL contains an invalid authority: {0}", authority));
319 return false;
320 }
321 // drop through to continue validation
322 } else { // not file:
323 // Validate the authority
324 if (!isValidAuthority(authority)) {
325 setErrorMessage(tr("URL contains an invalid authority: {0}", authority));
326 return false;
327 }
328 }
329
330 String path = urlMatcher.group(PARSE_URL_PATH);
331 if (!isValidPath(path)) {
332 setErrorMessage(tr("URL contains an invalid path: {0}", path));
333 return false;
334 }
335
336 String query = urlMatcher.group(PARSE_URL_QUERY);
337 if (!isValidQuery(query)) {
338 setErrorMessage(tr("URL contains an invalid query: {0}", query));
339 return false;
340 }
341
342 String fragment = urlMatcher.group(PARSE_URL_FRAGMENT);
343 if (!isValidFragment(fragment)) {
344 setErrorMessage(tr("URL contains an invalid fragment: {0}", fragment));
345 return false;
346 }
347
348 return true;
349 }
350
351 @Override
352 public String getValidatorName() {
353 return tr("URL validator");
354 }
355
356 /**
357 * Validate scheme. If schemes[] was initialized to a non null,
358 * then only those schemes are allowed.
359 * Otherwise the default schemes are "http", "https", "ftp".
360 * Matching is case-blind.
361 * @param scheme The scheme to validate. A <code>null</code> value is considered
362 * invalid.
363 * @return true if valid.
364 */
365 protected boolean isValidScheme(String scheme) {
366 if (scheme == null) {
367 return false;
368 }
369
370 // TODO could be removed if external schemes were checked in the ctor before being stored
371 if (!SCHEME_PATTERN.matcher(scheme).matches()) {
372 return false;
373 }
374
375 return isOn(ALLOW_ALL_SCHEMES) || allowedSchemes.contains(scheme.toLowerCase(Locale.ENGLISH));
376 }
377
378 /**
379 * Returns true if the authority is properly formatted. An authority is the combination
380 * of hostname and port. A <code>null</code> authority value is considered invalid.
381 * Note: this implementation validates the domain unless a RegexValidator was provided.
382 * If a RegexValidator was supplied and it matches, then the authority is regarded
383 * as valid with no further checks, otherwise the method checks against the
384 * AUTHORITY_PATTERN and the DomainValidator (ALLOW_LOCAL_URLS)
385 * @param authority Authority value to validate, alllows IDN
386 * @return true if authority (hostname and port) is valid.
387 */
388 protected boolean isValidAuthority(String authority) {
389 if (authority == null) {
390 return false;
391 }
392
393 // check manual authority validation if specified
394 if (authorityValidator != null && authorityValidator.isValid(authority)) {
395 return true;
396 }
397 // convert to ASCII if possible
398 final String authorityASCII = DomainValidator.unicodeToASCII(authority);
399
400 Matcher authorityMatcher = AUTHORITY_PATTERN.matcher(authorityASCII);
401 if (!authorityMatcher.matches()) {
402 return false;
403 }
404
405 // We have to process IPV6 separately because that is parsed in a different group
406 String ipv6 = authorityMatcher.group(PARSE_AUTHORITY_IPV6);
407 if (ipv6 != null) {
408 InetAddressValidator inetAddressValidator = InetAddressValidator.getInstance();
409 if (!inetAddressValidator.isValidInet6Address(ipv6)) {
410 return false;
411 }
412 } else {
413 String hostLocation = authorityMatcher.group(PARSE_AUTHORITY_HOST_IP);
414 // check if authority is hostname or IP address:
415 // try a hostname first since that's much more likely
416 DomainValidator domainValidator = DomainValidator.getInstance(isOn(ALLOW_LOCAL_URLS));
417 if (!domainValidator.isValid(hostLocation)) {
418 // try an IPv4 address
419 InetAddressValidator inetAddressValidator = InetAddressValidator.getInstance();
420 if (!inetAddressValidator.isValidInet4Address(hostLocation)) {
421 // isn't IPv4, so the URL is invalid
422 return false;
423 }
424 }
425 }
426
427 return Optional.ofNullable(authorityMatcher.group(PARSE_AUTHORITY_EXTRA)).orElse("").trim().isEmpty();
428 }
429
430 /**
431 * Returns true if the path is valid. A <code>null</code> value is considered invalid.
432 * @param path Path value to validate.
433 * @return true if path is valid.
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}
Note: See TracBrowser for help on using the repository browser.