url/gurl.cc

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifdef WIN32
   6 #include <windows.h>
   7 #else
   8 #include <pthread.h>
   9 #endif
  10
  11 #include <algorithm>
  12 #include <ostream>
  13
  14 #include "url/gurl.h"
  15
  16 #include "base/logging.h"
  17 #include "url/url_canon_stdstring.h"
  18 #include "url/url_util.h"
  19
  20 namespace {
  21
  22 // External template that can handle initialization of either character type.
  23 // The input spec is given, and the canonical version will be placed in
  24 // |*canonical|, along with the parsing of the canonical spec in |*parsed|.
  25 template<typename STR>
  26 bool InitCanonical(const STR& input_spec,
  27                    std::string* canonical,
  28                    url_parse::Parsed* parsed) {
  29   // Reserve enough room in the output for the input, plus some extra so that
  30   // we have room if we have to escape a few things without reallocating.
  31   canonical->reserve(input_spec.size() + 32);
  32   url_canon::StdStringCanonOutput output(canonical);
  33   bool success = url_util::Canonicalize(
  34       input_spec.data(), static_cast<int>(input_spec.length()),
  35       NULL, &output, parsed);
  36
  37   output.Complete();  // Must be done before using string.
  38   return success;
  39 }
  40
  41 static std::string* empty_string = NULL;
  42 static GURL* empty_gurl = NULL;
  43
  44 #ifdef WIN32
  45
  46 // Returns a static reference to an empty string for returning a reference
  47 // when there is no underlying string.
  48 const std::string& EmptyStringForGURL() {
  49   // Avoid static object construction/destruction on startup/shutdown.
  50   if (!empty_string) {
  51     // Create the string. Be careful that we don't break in the case that this
  52     // is being called from multiple threads. Statics are not threadsafe.
  53     std::string* new_empty_string = new std::string;
  54     if (InterlockedCompareExchangePointer(
  55         reinterpret_cast<PVOID*>(&empty_string), new_empty_string, NULL)) {
  56       // The old value was non-NULL, so no replacement was done. Another
  57       // thread did the initialization out from under us.
  58       delete new_empty_string;
  59     }
  60   }
  61   return *empty_string;
  62 }
  63
  64 #else
  65
  66 static pthread_once_t empty_string_once = PTHREAD_ONCE_INIT;
  67 static pthread_once_t empty_gurl_once = PTHREAD_ONCE_INIT;
  68
  69 void EmptyStringForGURLOnce(void) {
  70   empty_string = new std::string;
  71 }
  72
  73 const std::string& EmptyStringForGURL() {
  74   // Avoid static object construction/destruction on startup/shutdown.
  75   pthread_once(&empty_string_once, EmptyStringForGURLOnce);
  76   return *empty_string;
  77 }
  78
  79 #endif  // WIN32
  80
  81 } // namespace
  82
  83 GURL::GURL() : is_valid_(false), inner_url_(NULL) {
  84 }
  85
  86 GURL::GURL(const GURL& other)
  87     : spec_(other.spec_),
  88       is_valid_(other.is_valid_),
  89       parsed_(other.parsed_),
  90       inner_url_(NULL) {
  91   if (other.inner_url_)
  92     inner_url_ = new GURL(*other.inner_url_);
  93   // Valid filesystem urls should always have an inner_url_.
  94   DCHECK(!is_valid_ || !SchemeIsFileSystem() || inner_url_);
  95 }
  96
  97 GURL::GURL(const std::string& url_string) : inner_url_(NULL) {
  98   is_valid_ = InitCanonical(url_string, &spec_, &parsed_);
  99   if (is_valid_ && SchemeIsFileSystem()) {
 100     inner_url_ =
 101         new GURL(spec_.data(), parsed_.Length(), *parsed_.inner_parsed(), true);
 102   }
 103 }
 104
 105 GURL::GURL(const base::string16& url_string) : inner_url_(NULL) {
 106   is_valid_ = InitCanonical(url_string, &spec_, &parsed_);
 107   if (is_valid_ && SchemeIsFileSystem()) {
 108     inner_url_ =
 109         new GURL(spec_.data(), parsed_.Length(), *parsed_.inner_parsed(), true);
 110   }
 111 }
 112
 113 GURL::GURL(const char* canonical_spec, size_t canonical_spec_len,
 114            const url_parse::Parsed& parsed, bool is_valid)
 115     : spec_(canonical_spec, canonical_spec_len),
 116       is_valid_(is_valid),
 117       parsed_(parsed),
 118       inner_url_(NULL) {
 119   InitializeFromCanonicalSpec();
 120 }
 121
 122 GURL::GURL(std::string canonical_spec,
 123            const url_parse::Parsed& parsed, bool is_valid)
 124     : is_valid_(is_valid),
 125       parsed_(parsed),
 126       inner_url_(NULL) {
 127   spec_.swap(canonical_spec);
 128   InitializeFromCanonicalSpec();
 129 }
 130
 131 void GURL::InitializeFromCanonicalSpec() {
 132   if (is_valid_ && SchemeIsFileSystem()) {
 133     inner_url_ =
 134         new GURL(spec_.data(), parsed_.Length(), *parsed_.inner_parsed(), true);
 135   }
 136
 137 #ifndef NDEBUG
 138   // For testing purposes, check that the parsed canonical URL is identical to
 139   // what we would have produced. Skip checking for invalid URLs have no meaning
 140   // and we can't always canonicalize then reproducabely.
 141   if (is_valid_) {
 142     url_parse::Component scheme;
 143     if (!url_util::FindAndCompareScheme(spec_.data(), spec_.length(),
 144                                         "filesystem", &scheme) ||
 145         scheme.begin == parsed_.scheme.begin) {
 146       // We can't do this check on the inner_url of a filesystem URL, as
 147       // canonical_spec actually points to the start of the outer URL, so we'd
 148       // end up with infinite recursion in this constructor.
 149       GURL test_url(spec_);
 150
 151       DCHECK(test_url.is_valid_ == is_valid_);
 152       DCHECK(test_url.spec_ == spec_);
 153
 154       DCHECK(test_url.parsed_.scheme == parsed_.scheme);
 155       DCHECK(test_url.parsed_.username == parsed_.username);
 156       DCHECK(test_url.parsed_.password == parsed_.password);
 157       DCHECK(test_url.parsed_.host == parsed_.host);
 158       DCHECK(test_url.parsed_.port == parsed_.port);
 159       DCHECK(test_url.parsed_.path == parsed_.path);
 160       DCHECK(test_url.parsed_.query == parsed_.query);
 161       DCHECK(test_url.parsed_.ref == parsed_.ref);
 162     }
 163   }
 164 #endif
 165 }
 166
 167 GURL::~GURL() {
 168   delete inner_url_;
 169 }
 170
 171 GURL& GURL::operator=(const GURL& other) {
 172   spec_ = other.spec_;
 173   is_valid_ = other.is_valid_;
 174   parsed_ = other.parsed_;
 175   delete inner_url_;
 176   inner_url_ = NULL;
 177   if (other.inner_url_)
 178     inner_url_ = new GURL(*other.inner_url_);
 179   // Valid filesystem urls should always have an inner_url_.
 180   DCHECK(!is_valid_ || !SchemeIsFileSystem() || inner_url_);
 181   return *this;
 182 }
 183
 184 const std::string& GURL::spec() const {
 185   if (is_valid_ || spec_.empty())
 186     return spec_;
 187
 188   DCHECK(false) << "Trying to get the spec of an invalid URL!";
 189   return EmptyStringForGURL();
 190 }
 191
 192 GURL GURL::Resolve(const std::string& relative) const {
 193   return ResolveWithCharsetConverter(relative, NULL);
 194 }
 195 GURL GURL::Resolve(const base::string16& relative) const {
 196   return ResolveWithCharsetConverter(relative, NULL);
 197 }
 198
 199 // Note: code duplicated below (it's inconvenient to use a template here).
 200 GURL GURL::ResolveWithCharsetConverter(
 201     const std::string& relative,
 202     url_canon::CharsetConverter* charset_converter) const {
 203   // Not allowed for invalid URLs.
 204   if (!is_valid_)
 205     return GURL();
 206
 207   GURL result;
 208
 209   // Reserve enough room in the output for the input, plus some extra so that
 210   // we have room if we have to escape a few things without reallocating.
 211   result.spec_.reserve(spec_.size() + 32);
 212   url_canon::StdStringCanonOutput output(&result.spec_);
 213
 214   if (!url_util::ResolveRelative(
 215           spec_.data(), static_cast<int>(spec_.length()), parsed_,
 216           relative.data(), static_cast<int>(relative.length()),
 217           charset_converter, &output, &result.parsed_)) {
 218     // Error resolving, return an empty URL.
 219     return GURL();
 220   }
 221
 222   output.Complete();
 223   result.is_valid_ = true;
 224   if (result.SchemeIsFileSystem()) {
 225     result.inner_url_ = new GURL(result.spec_.data(), result.parsed_.Length(),
 226                                  *result.parsed_.inner_parsed(), true);
 227   }
 228   return result;
 229 }
 230
 231 // Note: code duplicated above (it's inconvenient to use a template here).
 232 GURL GURL::ResolveWithCharsetConverter(
 233     const base::string16& relative,
 234     url_canon::CharsetConverter* charset_converter) const {
 235   // Not allowed for invalid URLs.
 236   if (!is_valid_)
 237     return GURL();
 238
 239   GURL result;
 240
 241   // Reserve enough room in the output for the input, plus some extra so that
 242   // we have room if we have to escape a few things without reallocating.
 243   result.spec_.reserve(spec_.size() + 32);
 244   url_canon::StdStringCanonOutput output(&result.spec_);
 245
 246   if (!url_util::ResolveRelative(
 247           spec_.data(), static_cast<int>(spec_.length()), parsed_,
 248           relative.data(), static_cast<int>(relative.length()),
 249           charset_converter, &output, &result.parsed_)) {
 250     // Error resolving, return an empty URL.
 251     return GURL();
 252   }
 253
 254   output.Complete();
 255   result.is_valid_ = true;
 256   if (result.SchemeIsFileSystem()) {
 257     result.inner_url_ = new GURL(result.spec_.data(), result.parsed_.Length(),
 258                                  *result.parsed_.inner_parsed(), true);
 259   }
 260   return result;
 261 }
 262
 263 // Note: code duplicated below (it's inconvenient to use a template here).
 264 GURL GURL::ReplaceComponents(
 265     const url_canon::Replacements<char>& replacements) const {
 266   GURL result;
 267
 268   // Not allowed for invalid URLs.
 269   if (!is_valid_)
 270     return GURL();
 271
 272   // Reserve enough room in the output for the input, plus some extra so that
 273   // we have room if we have to escape a few things without reallocating.
 274   result.spec_.reserve(spec_.size() + 32);
 275   url_canon::StdStringCanonOutput output(&result.spec_);
 276
 277   result.is_valid_ = url_util::ReplaceComponents(
 278       spec_.data(), static_cast<int>(spec_.length()), parsed_, replacements,
 279       NULL, &output, &result.parsed_);
 280
 281   output.Complete();
 282   if (result.is_valid_ && result.SchemeIsFileSystem()) {
 283     result.inner_url_ = new GURL(spec_.data(), result.parsed_.Length(),
 284                                  *result.parsed_.inner_parsed(), true);
 285   }
 286   return result;
 287 }
 288
 289 // Note: code duplicated above (it's inconvenient to use a template here).
 290 GURL GURL::ReplaceComponents(
 291     const url_canon::Replacements<base::char16>& replacements) const {
 292   GURL result;
 293
 294   // Not allowed for invalid URLs.
 295   if (!is_valid_)
 296     return GURL();
 297
 298   // Reserve enough room in the output for the input, plus some extra so that
 299   // we have room if we have to escape a few things without reallocating.
 300   result.spec_.reserve(spec_.size() + 32);
 301   url_canon::StdStringCanonOutput output(&result.spec_);
 302
 303   result.is_valid_ = url_util::ReplaceComponents(
 304       spec_.data(), static_cast<int>(spec_.length()), parsed_, replacements,
 305       NULL, &output, &result.parsed_);
 306
 307   output.Complete();
 308   if (result.is_valid_ && result.SchemeIsFileSystem()) {
 309     result.inner_url_ = new GURL(spec_.data(), result.parsed_.Length(),
 310                                  *result.parsed_.inner_parsed(), true);
 311   }
 312   return result;
 313 }
 314
 315 GURL GURL::GetOrigin() const {
 316   // This doesn't make sense for invalid or nonstandard URLs, so return
 317   // the empty URL
 318   if (!is_valid_ || !IsStandard())
 319     return GURL();
 320
 321   if (SchemeIsFileSystem())
 322     return inner_url_->GetOrigin();
 323
 324   url_canon::Replacements<char> replacements;
 325   replacements.ClearUsername();
 326   replacements.ClearPassword();
 327   replacements.ClearPath();
 328   replacements.ClearQuery();
 329   replacements.ClearRef();
 330
 331   return ReplaceComponents(replacements);
 332 }
 333
 334 GURL GURL::GetWithEmptyPath() const {
 335   // This doesn't make sense for invalid or nonstandard URLs, so return
 336   // the empty URL.
 337   if (!is_valid_ || !IsStandard())
 338     return GURL();
 339
 340   // We could optimize this since we know that the URL is canonical, and we are
 341   // appending a canonical path, so avoiding re-parsing.
 342   GURL other(*this);
 343   if (parsed_.path.len == 0)
 344     return other;
 345
 346   // Clear everything after the path.
 347   other.parsed_.query.reset();
 348   other.parsed_.ref.reset();
 349
 350   // Set the path, since the path is longer than one, we can just set the
 351   // first character and resize.
 352   other.spec_[other.parsed_.path.begin] = '/';
 353   other.parsed_.path.len = 1;
 354   other.spec_.resize(other.parsed_.path.begin + 1);
 355   return other;
 356 }
 357
 358 bool GURL::IsStandard() const {
 359   return url_util::IsStandard(spec_.data(), parsed_.scheme);
 360 }
 361
 362 bool GURL::SchemeIs(const char* lower_ascii_scheme) const {
 363   if (parsed_.scheme.len <= 0)
 364     return lower_ascii_scheme == NULL;
 365   return url_util::LowerCaseEqualsASCII(spec_.data() + parsed_.scheme.begin,
 366                                         spec_.data() + parsed_.scheme.end(),
 367                                         lower_ascii_scheme);
 368 }
 369
 370 int GURL::IntPort() const {
 371   if (parsed_.port.is_nonempty())
 372     return url_parse::ParsePort(spec_.data(), parsed_.port);
 373   return url_parse::PORT_UNSPECIFIED;
 374 }
 375
 376 int GURL::EffectiveIntPort() const {
 377   int int_port = IntPort();
 378   if (int_port == url_parse::PORT_UNSPECIFIED && IsStandard())
 379     return url_canon::DefaultPortForScheme(spec_.data() + parsed_.scheme.begin,
 380                                            parsed_.scheme.len);
 381   return int_port;
 382 }
 383
 384 std::string GURL::ExtractFileName() const {
 385   url_parse::Component file_component;
 386   url_parse::ExtractFileName(spec_.data(), parsed_.path, &file_component);
 387   return ComponentString(file_component);
 388 }
 389
 390 std::string GURL::PathForRequest() const {
 391   DCHECK(parsed_.path.len > 0) << "Canonical path for requests should be non-empty";
 392   if (parsed_.ref.len >= 0) {
 393     // Clip off the reference when it exists. The reference starts after the #
 394     // sign, so we have to subtract one to also remove it.
 395     return std::string(spec_, parsed_.path.begin,
 396                        parsed_.ref.begin - parsed_.path.begin - 1);
 397   }
 398   // Compute the actual path length, rather than depending on the spec's
 399   // terminator.  If we're an inner_url, our spec continues on into our outer
 400   // url's path/query/ref.
 401   int path_len = parsed_.path.len;
 402   if (parsed_.query.is_valid())
 403     path_len = parsed_.query.end() - parsed_.path.begin;
 404
 405   return std::string(spec_, parsed_.path.begin, path_len);
 406 }
 407
 408 std::string GURL::HostNoBrackets() const {
 409   // If host looks like an IPv6 literal, strip the square brackets.
 410   url_parse::Component h(parsed_.host);
 411   if (h.len >= 2 && spec_[h.begin] == '[' && spec_[h.end() - 1] == ']') {
 412     h.begin++;
 413     h.len -= 2;
 414   }
 415   return ComponentString(h);
 416 }
 417
 418 bool GURL::HostIsIPAddress() const {
 419   if (!is_valid_ || spec_.empty())
 420      return false;
 421
 422   url_canon::RawCanonOutputT<char, 128> ignored_output;
 423   url_canon::CanonHostInfo host_info;
 424   url_canon::CanonicalizeIPAddress(spec_.c_str(), parsed_.host,
 425                                    &ignored_output, &host_info);
 426   return host_info.IsIPAddress();
 427 }
 428
 429 #ifdef WIN32
 430
 431 const GURL& GURL::EmptyGURL() {
 432   // Avoid static object construction/destruction on startup/shutdown.
 433   if (!empty_gurl) {
 434     // Create the string. Be careful that we don't break in the case that this
 435     // is being called from multiple threads.
 436     GURL* new_empty_gurl = new GURL;
 437     if (InterlockedCompareExchangePointer(
 438         reinterpret_cast<PVOID*>(&empty_gurl), new_empty_gurl, NULL)) {
 439       // The old value was non-NULL, so no replacement was done. Another
 440       // thread did the initialization out from under us.
 441       delete new_empty_gurl;
 442     }
 443   }
 444   return *empty_gurl;
 445 }
 446
 447 #else
 448
 449 void EmptyGURLOnce(void) {
 450   empty_gurl = new GURL;
 451 }
 452
 453 const GURL& GURL::EmptyGURL() {
 454   // Avoid static object construction/destruction on startup/shutdown.
 455   pthread_once(&empty_gurl_once, EmptyGURLOnce);
 456   return *empty_gurl;
 457 }
 458
 459 #endif  // WIN32
 460
 461 bool GURL::DomainIs(const char* lower_ascii_domain,
 462                     int domain_len) const {
 463   // Return false if this URL is not valid or domain is empty.
 464   if (!is_valid_ || !domain_len)
 465     return false;
 466
 467   // FileSystem URLs have empty parsed_.host, so check this first.
 468   if (SchemeIsFileSystem() && inner_url_)
 469     return inner_url_->DomainIs(lower_ascii_domain, domain_len);
 470
 471   if (!parsed_.host.is_nonempty())
 472     return false;
 473
 474   // Check whether the host name is end with a dot. If yes, treat it
 475   // the same as no-dot unless the input comparison domain is end
 476   // with dot.
 477   const char* last_pos = spec_.data() + parsed_.host.end() - 1;
 478   int host_len = parsed_.host.len;
 479   if ('.' == *last_pos && '.' != lower_ascii_domain[domain_len - 1]) {
 480     last_pos--;
 481     host_len--;
 482   }
 483
 484   // Return false if host's length is less than domain's length.
 485   if (host_len < domain_len)
 486     return false;
 487
 488   // Compare this url whether belong specific domain.
 489   const char* start_pos = spec_.data() + parsed_.host.begin +
 490                           host_len - domain_len;
 491
 492   if (!url_util::LowerCaseEqualsASCII(start_pos,
 493                                       last_pos + 1,
 494                                       lower_ascii_domain,
 495                                       lower_ascii_domain + domain_len))
 496     return false;
 497
 498   // Check whether host has right domain start with dot, make sure we got
 499   // right domain range. For example www.google.com has domain
 500   // "google.com" but www.iamnotgoogle.com does not.
 501   if ('.' != lower_ascii_domain[0] && host_len > domain_len &&
 502       '.' != *(start_pos - 1))
 503     return false;
 504
 505   return true;
 506 }
 507
 508 void GURL::Swap(GURL* other) {
 509   spec_.swap(other->spec_);
 510   std::swap(is_valid_, other->is_valid_);
 511   std::swap(parsed_, other->parsed_);
 512   std::swap(inner_url_, other->inner_url_);
 513 }
 514
 515 std::ostream& operator<<(std::ostream& out, const GURL& url) {
 516   return out << url.possibly_invalid_spec();
 517 }