scheme_host_port_matcher.cc 2.9 KB

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  1. // Copyright 2020 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. #include "net/base/scheme_host_port_matcher.h"
  5. #include "base/containers/adapters.h"
  6. #include "base/containers/contains.h"
  7. #include "base/strings/string_tokenizer.h"
  8. #include "base/strings/string_util.h"
  9. namespace net {
  10. // Declares SchemeHostPortMatcher::kParseRuleListDelimiterList[], not a
  11. // redefinition. This is needed for link.
  12. // static
  13. constexpr char SchemeHostPortMatcher::kParseRuleListDelimiterList[];
  14. // Declares SchemeHostPortMatcher::kPrintRuleListDelimiter, not a
  15. // redefinition. This is needed for link.
  16. // static
  17. constexpr char SchemeHostPortMatcher::kPrintRuleListDelimiter;
  18. // static
  19. SchemeHostPortMatcher SchemeHostPortMatcher::FromRawString(
  20. const std::string& raw) {
  21. SchemeHostPortMatcher result;
  22. base::StringTokenizer entries(raw, kParseRuleListDelimiterList);
  23. while (entries.GetNext()) {
  24. auto rule = SchemeHostPortMatcherRule::FromUntrimmedRawString(
  25. entries.token_piece());
  26. if (rule) {
  27. result.AddAsLastRule(std::move(rule));
  28. }
  29. }
  30. return result;
  31. }
  32. void SchemeHostPortMatcher::AddAsFirstRule(
  33. std::unique_ptr<SchemeHostPortMatcherRule> rule) {
  34. DCHECK(rule);
  35. rules_.insert(rules_.begin(), std::move(rule));
  36. }
  37. void SchemeHostPortMatcher::AddAsLastRule(
  38. std::unique_ptr<SchemeHostPortMatcherRule> rule) {
  39. DCHECK(rule);
  40. rules_.push_back(std::move(rule));
  41. }
  42. void SchemeHostPortMatcher::ReplaceRule(
  43. size_t index,
  44. std::unique_ptr<SchemeHostPortMatcherRule> rule) {
  45. DCHECK_LT(index, rules_.size());
  46. rules_[index] = std::move(rule);
  47. }
  48. bool SchemeHostPortMatcher::Includes(const GURL& url) const {
  49. return Evaluate(url) == SchemeHostPortMatcherResult::kInclude;
  50. }
  51. SchemeHostPortMatcherResult SchemeHostPortMatcher::Evaluate(
  52. const GURL& url) const {
  53. // Later rules override earlier rules, so evaluating the rule list can be
  54. // done by iterating over it in reverse and short-circuiting when a match is
  55. // found.
  56. //
  57. // The order of evaluation generally doesn't matter if all the rules are
  58. // positive rules, so matches are just additive.
  59. //
  60. // However when mixing positive and negative rules, evaluation order makes a
  61. // difference.
  62. for (const auto& rule : base::Reversed(rules_)) {
  63. SchemeHostPortMatcherResult result = rule->Evaluate(url);
  64. if (result != SchemeHostPortMatcherResult::kNoMatch)
  65. return result;
  66. }
  67. return SchemeHostPortMatcherResult::kNoMatch;
  68. }
  69. std::string SchemeHostPortMatcher::ToString() const {
  70. std::string result;
  71. for (const auto& rule : rules_) {
  72. DCHECK(!base::Contains(rule->ToString(), kParseRuleListDelimiterList));
  73. result += rule->ToString();
  74. result.push_back(kPrintRuleListDelimiter);
  75. }
  76. return result;
  77. }
  78. void SchemeHostPortMatcher::Clear() {
  79. rules_.clear();
  80. }
  81. } // namespace net