File: link_header.cc

package info (click to toggle)
chromium 139.0.7258.138-1
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid
  • size: 6,120,676 kB
  • sloc: cpp: 35,100,869; ansic: 7,163,530; javascript: 4,103,002; python: 1,436,920; asm: 946,517; xml: 746,709; pascal: 187,653; perl: 88,691; sh: 88,436; objc: 79,953; sql: 51,488; cs: 44,583; fortran: 24,137; makefile: 22,147; tcl: 15,277; php: 13,980; yacc: 8,984; ruby: 7,485; awk: 3,720; lisp: 3,096; lex: 1,327; ada: 727; jsp: 228; sed: 36
file content (147 lines) | stat: -rw-r--r-- 5,845 bytes parent folder | download | duplicates (5)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "third_party/blink/renderer/platform/loader/link_header.h"

#include <string_view>

#include "base/strings/string_util.h"
#include "components/link_header_util/link_header_util.h"
#include "third_party/blink/public/common/web_package/signed_exchange_consts.h"
#include "third_party/blink/renderer/platform/wtf/text/parsing_utilities.h"

namespace blink {

// Verify that the parameter is a link-extension which according to spec doesn't
// have to have a value.
static bool IsExtensionParameter(LinkHeader::LinkParameterName name) {
  return name >= LinkHeader::kLinkParameterUnknown;
}

static LinkHeader::LinkParameterName ParameterNameFromString(
    std::string_view name) {
  if (base::EqualsCaseInsensitiveASCII(name, "rel"))
    return LinkHeader::kLinkParameterRel;
  if (base::EqualsCaseInsensitiveASCII(name, "anchor"))
    return LinkHeader::kLinkParameterAnchor;
  if (base::EqualsCaseInsensitiveASCII(name, "crossorigin"))
    return LinkHeader::kLinkParameterCrossOrigin;
  if (base::EqualsCaseInsensitiveASCII(name, "title"))
    return LinkHeader::kLinkParameterTitle;
  if (base::EqualsCaseInsensitiveASCII(name, "media"))
    return LinkHeader::kLinkParameterMedia;
  if (base::EqualsCaseInsensitiveASCII(name, "type"))
    return LinkHeader::kLinkParameterType;
  if (base::EqualsCaseInsensitiveASCII(name, "rev"))
    return LinkHeader::kLinkParameterRev;
  if (base::EqualsCaseInsensitiveASCII(name, "referrerpolicy"))
    return LinkHeader::kLinkParameterReferrerPolicy;
  if (base::EqualsCaseInsensitiveASCII(name, "hreflang"))
    return LinkHeader::kLinkParameterHreflang;
  if (base::EqualsCaseInsensitiveASCII(name, "as"))
    return LinkHeader::kLinkParameterAs;
  if (base::EqualsCaseInsensitiveASCII(name, "nonce"))
    return LinkHeader::kLinkParameterNonce;
  if (base::EqualsCaseInsensitiveASCII(name, "integrity"))
    return LinkHeader::kLinkParameterIntegrity;
  if (base::EqualsCaseInsensitiveASCII(name, "imagesrcset"))
    return LinkHeader::kLinkParameterImageSrcset;
  if (base::EqualsCaseInsensitiveASCII(name, "imagesizes"))
    return LinkHeader::kLinkParameterImageSizes;
  if (base::EqualsCaseInsensitiveASCII(name, "anchor"))
    return LinkHeader::kLinkParameterAnchor;

  // "header-integrity" and "variants" and "variant-key" are used only for
  // SignedExchangeSubresourcePrefetch.
  if (base::EqualsCaseInsensitiveASCII(name, "header-integrity"))
    return LinkHeader::kLinkParameterHeaderIntegrity;
  if (base::EqualsCaseInsensitiveASCII(name, kSignedExchangeVariantsHeader))
    return LinkHeader::kLinkParameterVariants;
  if (base::EqualsCaseInsensitiveASCII(name, kSignedExchangeVariantKeyHeader))
    return LinkHeader::kLinkParameterVariantKey;

  if (base::EqualsCaseInsensitiveASCII(name, "blocking")) {
    return LinkHeader::kLinkParameterBlocking;
  }

  if (base::EqualsCaseInsensitiveASCII(name, "fetchpriority")) {
    return LinkHeader::kLinkParameterFetchPriority;
  }

  return LinkHeader::kLinkParameterUnknown;
}

void LinkHeader::SetValue(LinkParameterName name, const String& value) {
  if (name == kLinkParameterRel && !rel_) {
    rel_ = value.DeprecatedLower();
  } else if (name == kLinkParameterAnchor) {
    anchor_ = value;
  } else if (name == kLinkParameterCrossOrigin) {
    cross_origin_ = value;
  } else if (name == kLinkParameterAs) {
    as_ = value.DeprecatedLower();
  } else if (name == kLinkParameterType) {
    mime_type_ = value.DeprecatedLower();
  } else if (name == kLinkParameterMedia) {
    media_ = value.DeprecatedLower();
  } else if (name == kLinkParameterNonce) {
    nonce_ = value;
  } else if (name == kLinkParameterIntegrity) {
    integrity_ = value;
  } else if (name == kLinkParameterImageSrcset) {
    image_srcset_ = value;
  } else if (name == kLinkParameterImageSizes) {
    image_sizes_ = value;
  } else if (name == kLinkParameterHeaderIntegrity) {
    header_integrity_ = value;
  } else if (name == kLinkParameterVariants) {
    variants_ = value;
  } else if (name == kLinkParameterVariantKey) {
    variant_key_ = value;
  } else if (name == kLinkParameterBlocking) {
    blocking_ = value;
  } else if (name == kLinkParameterReferrerPolicy) {
    referrer_policy_ = value;
  } else if (name == kLinkParameterFetchPriority) {
    fetch_priority_ = value;
  }
}

template <typename Iterator>
LinkHeader::LinkHeader(Iterator begin, Iterator end) : is_valid_(true) {
  std::unordered_map<std::string, std::optional<std::string>> params;
  std::optional<std::string> url = link_header_util::ParseLinkHeaderValue(
      std::string_view(begin, end), params);
  is_valid_ = url.has_value();
  if (!is_valid_)
    return;

  url_ = String(*url);
  for (const auto& param : params) {
    LinkParameterName name = ParameterNameFromString(param.first);
    if (!IsExtensionParameter(name) && !param.second)
      is_valid_ = false;
    std::string value = param.second.value_or("");
    SetValue(name, String(value));
  }
  // According to Section 5.2 of RFC 5988, "anchor" parameters in Link headers
  // must be either respected, or the entire header must be ignored:
  // https://tools.ietf.org/html/rfc5988#section-5.2
  // Blink uses "anchor" parameters only for SignedExchangeSubresourcePrefetch
  // and the rel is "alternate".
  if (anchor_.has_value() && rel_ != "alternate")
    is_valid_ = false;
}

LinkHeaderSet::LinkHeaderSet(const String& header) {
  if (header.IsNull())
    return;

  DCHECK(header.Is8Bit()) << "Headers should always be 8 bit";
  std::string header_string = header.Latin1();
  for (const auto& value : link_header_util::SplitLinkHeader(header_string))
    header_set_.push_back(LinkHeader(value.first, value.second));
}

}  // namespace blink