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
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
|
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/AsyncEventDispatcher.h"
#include "mozilla/dom/HTMLMetaElement.h"
#include "mozilla/dom/HTMLMetaElementBinding.h"
#include "mozilla/dom/nsCSPService.h"
#include "nsContentUtils.h"
#include "nsStyleConsts.h"
#include "nsIContentSecurityPolicy.h"
NS_IMPL_NS_NEW_HTML_ELEMENT(Meta)
namespace mozilla {
namespace dom {
HTMLMetaElement::HTMLMetaElement(already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo)
: nsGenericHTMLElement(aNodeInfo)
{
}
HTMLMetaElement::~HTMLMetaElement()
{
}
NS_IMPL_ISUPPORTS_INHERITED(HTMLMetaElement, nsGenericHTMLElement,
nsIDOMHTMLMetaElement)
NS_IMPL_ELEMENT_CLONE(HTMLMetaElement)
NS_IMPL_STRING_ATTR(HTMLMetaElement, Content, content)
NS_IMPL_STRING_ATTR(HTMLMetaElement, HttpEquiv, httpEquiv)
NS_IMPL_STRING_ATTR(HTMLMetaElement, Name, name)
NS_IMPL_STRING_ATTR(HTMLMetaElement, Scheme, scheme)
nsresult
HTMLMetaElement::SetMetaReferrer(nsIDocument* aDocument)
{
if (!aDocument ||
!AttrValueIs(kNameSpaceID_None, nsGkAtoms::name, nsGkAtoms::referrer, eIgnoreCase)) {
return NS_OK;
}
nsAutoString content;
nsresult rv = GetContent(content);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
Element* headElt = aDocument->GetHeadElement();
if (headElt && nsContentUtils::ContentIsDescendantOf(this, headElt)) {
content = nsContentUtils::TrimWhitespace<nsContentUtils::IsHTMLWhitespace>(content);
aDocument->SetHeaderData(nsGkAtoms::referrer, content);
}
return NS_OK;
}
nsresult
HTMLMetaElement::AfterSetAttr(int32_t aNameSpaceID, nsIAtom* aName,
const nsAttrValue* aValue,
const nsAttrValue* aOldValue, bool aNotify)
{
if (aNameSpaceID == kNameSpaceID_None) {
nsIDocument *document = GetUncomposedDoc();
if (aName == nsGkAtoms::content) {
if (document && AttrValueIs(kNameSpaceID_None, nsGkAtoms::name,
nsGkAtoms::viewport, eIgnoreCase)) {
nsAutoString content;
nsresult rv = GetContent(content);
NS_ENSURE_SUCCESS(rv, rv);
nsContentUtils::ProcessViewportInfo(document, content);
}
CreateAndDispatchEvent(document, NS_LITERAL_STRING("DOMMetaChanged"));
}
// Update referrer policy when it got changed from JS
nsresult rv = SetMetaReferrer(document);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
}
return nsGenericHTMLElement::AfterSetAttr(aNameSpaceID, aName, aValue,
aOldValue, aNotify);
}
nsresult
HTMLMetaElement::BindToTree(nsIDocument* aDocument, nsIContent* aParent,
nsIContent* aBindingParent,
bool aCompileEventHandlers)
{
nsresult rv = nsGenericHTMLElement::BindToTree(aDocument, aParent,
aBindingParent,
aCompileEventHandlers);
NS_ENSURE_SUCCESS(rv, rv);
if (aDocument &&
AttrValueIs(kNameSpaceID_None, nsGkAtoms::name, nsGkAtoms::viewport, eIgnoreCase)) {
nsAutoString content;
rv = GetContent(content);
NS_ENSURE_SUCCESS(rv, rv);
nsContentUtils::ProcessViewportInfo(aDocument, content);
}
if (CSPService::sCSPEnabled && aDocument &&
AttrValueIs(kNameSpaceID_None, nsGkAtoms::httpEquiv, nsGkAtoms::headerCSP, eIgnoreCase)) {
// only accept <meta http-equiv="Content-Security-Policy" content=""> if it appears
// in the <head> element.
Element* headElt = aDocument->GetHeadElement();
if (headElt && nsContentUtils::ContentIsDescendantOf(this, headElt)) {
nsAutoString content;
rv = GetContent(content);
NS_ENSURE_SUCCESS(rv, rv);
content = nsContentUtils::TrimWhitespace<nsContentUtils::IsHTMLWhitespace>(content);
nsIPrincipal* principal = aDocument->NodePrincipal();
nsCOMPtr<nsIContentSecurityPolicy> csp;
nsCOMPtr<nsIDOMDocument> domDoc = do_QueryInterface(aDocument);
principal->EnsureCSP(domDoc, getter_AddRefs(csp));
if (csp) {
// Multiple CSPs (delivered through either header of meta tag) need to be
// joined together, see:
// https://w3c.github.io/webappsec/specs/content-security-policy/#delivery-html-meta-element
rv = csp->AppendPolicy(content,
false, // csp via meta tag can not be report only
true); // delivered through the meta tag
NS_ENSURE_SUCCESS(rv, rv);
aDocument->ApplySettingsFromCSP(false);
}
}
}
// Referrer Policy spec requires a <meta name="referrer" tag to be in the
// <head> element.
rv = SetMetaReferrer(aDocument);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
CreateAndDispatchEvent(aDocument, NS_LITERAL_STRING("DOMMetaAdded"));
return rv;
}
void
HTMLMetaElement::UnbindFromTree(bool aDeep, bool aNullParent)
{
nsCOMPtr<nsIDocument> oldDoc = GetUncomposedDoc();
CreateAndDispatchEvent(oldDoc, NS_LITERAL_STRING("DOMMetaRemoved"));
nsGenericHTMLElement::UnbindFromTree(aDeep, aNullParent);
}
void
HTMLMetaElement::CreateAndDispatchEvent(nsIDocument* aDoc,
const nsAString& aEventName)
{
if (!aDoc)
return;
RefPtr<AsyncEventDispatcher> asyncDispatcher =
new AsyncEventDispatcher(this, aEventName, true, true);
asyncDispatcher->RunDOMEventWhenSafe();
}
JSObject*
HTMLMetaElement::WrapNode(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
{
return HTMLMetaElementBinding::Wrap(aCx, this, aGivenProto);
}
} // namespace dom
} // namespace mozilla
|
