mirror of
https://github.com/mozilla/gecko-dev.git
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786 lines
25 KiB
C++
786 lines
25 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsStyleUtil.h"
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#include "nsStyleConsts.h"
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#include "nsIContent.h"
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#include "nsCSSProps.h"
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#include "nsRuleNode.h"
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#include "nsROCSSPrimitiveValue.h"
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#include "nsStyleStruct.h"
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#include "nsIContentPolicy.h"
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#include "nsIContentSecurityPolicy.h"
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#include "nsIURI.h"
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#include "nsPrintfCString.h"
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using namespace mozilla;
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//------------------------------------------------------------------------------
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// Font Algorithm Code
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//------------------------------------------------------------------------------
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// Compare two language strings
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bool nsStyleUtil::DashMatchCompare(const nsAString& aAttributeValue,
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const nsAString& aSelectorValue,
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const nsStringComparator& aComparator)
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{
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bool result;
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uint32_t selectorLen = aSelectorValue.Length();
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uint32_t attributeLen = aAttributeValue.Length();
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if (selectorLen > attributeLen) {
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result = false;
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}
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else {
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nsAString::const_iterator iter;
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if (selectorLen != attributeLen &&
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*aAttributeValue.BeginReading(iter).advance(selectorLen) !=
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char16_t('-')) {
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// to match, the aAttributeValue must have a dash after the end of
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// the aSelectorValue's text (unless the aSelectorValue and the
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// aAttributeValue have the same text)
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result = false;
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}
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else {
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result = StringBeginsWith(aAttributeValue, aSelectorValue, aComparator);
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}
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}
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return result;
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}
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void nsStyleUtil::AppendEscapedCSSString(const nsAString& aString,
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nsAString& aReturn,
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char16_t quoteChar)
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{
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NS_PRECONDITION(quoteChar == '\'' || quoteChar == '"',
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"CSS strings must be quoted with ' or \"");
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aReturn.Append(quoteChar);
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const char16_t* in = aString.BeginReading();
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const char16_t* const end = aString.EndReading();
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for (; in != end; in++) {
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if (*in < 0x20 || (*in >= 0x7F && *in < 0xA0)) {
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// Escape U+0000 through U+001F and U+007F through U+009F numerically.
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aReturn.AppendPrintf("\\%hX ", *in);
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} else {
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if (*in == '"' || *in == '\'' || *in == '\\') {
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// Escape backslash and quote characters symbolically.
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// It's not technically necessary to escape the quote
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// character that isn't being used to delimit the string,
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// but we do it anyway because that makes testing simpler.
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aReturn.Append(char16_t('\\'));
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}
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aReturn.Append(*in);
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}
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}
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aReturn.Append(quoteChar);
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}
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/* static */ bool
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nsStyleUtil::AppendEscapedCSSIdent(const nsAString& aIdent, nsAString& aReturn)
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{
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// The relevant parts of the CSS grammar are:
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// ident ([-]?{nmstart}|[-][-]){nmchar}*
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// nmstart [_a-z]|{nonascii}|{escape}
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// nmchar [_a-z0-9-]|{nonascii}|{escape}
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// nonascii [^\0-\177]
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// escape {unicode}|\\[^\n\r\f0-9a-f]
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// unicode \\[0-9a-f]{1,6}(\r\n|[ \n\r\t\f])?
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// from http://www.w3.org/TR/CSS21/syndata.html#tokenization but
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// modified for idents by
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// http://dev.w3.org/csswg/cssom/#serialize-an-identifier and
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// http://dev.w3.org/csswg/css-syntax/#would-start-an-identifier
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const char16_t* in = aIdent.BeginReading();
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const char16_t* const end = aIdent.EndReading();
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if (in == end)
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return true;
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// A leading dash does not need to be escaped as long as it is not the
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// *only* character in the identifier.
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if (*in == '-') {
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if (in + 1 == end) {
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aReturn.Append(char16_t('\\'));
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aReturn.Append(char16_t('-'));
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return true;
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}
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aReturn.Append(char16_t('-'));
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++in;
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}
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// Escape a digit at the start (including after a dash),
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// numerically. If we didn't escape it numerically, it would get
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// interpreted as a numeric escape for the wrong character.
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if (in != end && ('0' <= *in && *in <= '9')) {
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aReturn.AppendPrintf("\\%hX ", *in);
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++in;
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}
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for (; in != end; ++in) {
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char16_t ch = *in;
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if (ch == 0x00) {
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return false;
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}
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if (ch < 0x20 || (0x7F <= ch && ch < 0xA0)) {
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// Escape U+0000 through U+001F and U+007F through U+009F numerically.
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aReturn.AppendPrintf("\\%hX ", *in);
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} else {
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// Escape ASCII non-identifier printables as a backslash plus
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// the character.
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if (ch < 0x7F &&
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ch != '_' && ch != '-' &&
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(ch < '0' || '9' < ch) &&
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(ch < 'A' || 'Z' < ch) &&
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(ch < 'a' || 'z' < ch)) {
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aReturn.Append(char16_t('\\'));
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}
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aReturn.Append(ch);
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}
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}
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return true;
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}
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// unquoted family names must be a sequence of idents
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// so escape any parts that require escaping
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static void
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AppendUnquotedFamilyName(const nsAString& aFamilyName, nsAString& aResult)
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{
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const char16_t *p, *p_end;
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aFamilyName.BeginReading(p);
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aFamilyName.EndReading(p_end);
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bool moreThanOne = false;
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while (p < p_end) {
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const char16_t* identStart = p;
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while (++p != p_end && *p != ' ')
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/* nothing */ ;
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nsDependentSubstring ident(identStart, p);
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if (!ident.IsEmpty()) {
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if (moreThanOne) {
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aResult.Append(' ');
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}
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nsStyleUtil::AppendEscapedCSSIdent(ident, aResult);
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moreThanOne = true;
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}
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++p;
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}
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}
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/* static */ void
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nsStyleUtil::AppendEscapedCSSFontFamilyList(
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const mozilla::FontFamilyList& aFamilyList,
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nsAString& aResult)
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{
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const nsTArray<FontFamilyName>& fontlist = aFamilyList.GetFontlist();
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size_t i, len = fontlist.Length();
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for (i = 0; i < len; i++) {
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if (i != 0) {
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aResult.Append(',');
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}
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const FontFamilyName& name = fontlist[i];
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switch (name.mType) {
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case eFamily_named:
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AppendUnquotedFamilyName(name.mName, aResult);
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break;
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case eFamily_named_quoted:
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AppendEscapedCSSString(name.mName, aResult);
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break;
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default:
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name.AppendToString(aResult);
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}
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}
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}
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/* static */ void
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nsStyleUtil::AppendBitmaskCSSValue(nsCSSProperty aProperty,
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int32_t aMaskedValue,
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int32_t aFirstMask,
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int32_t aLastMask,
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nsAString& aResult)
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{
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for (int32_t mask = aFirstMask; mask <= aLastMask; mask <<= 1) {
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if (mask & aMaskedValue) {
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AppendASCIItoUTF16(nsCSSProps::LookupPropertyValue(aProperty, mask),
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aResult);
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aMaskedValue &= ~mask;
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if (aMaskedValue) { // more left
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aResult.Append(char16_t(' '));
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}
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}
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}
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MOZ_ASSERT(aMaskedValue == 0, "unexpected bit remaining in bitfield");
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}
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/* static */ void
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nsStyleUtil::AppendAngleValue(const nsStyleCoord& aAngle, nsAString& aResult)
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{
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MOZ_ASSERT(aAngle.IsAngleValue(), "Should have angle value");
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// Append number.
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AppendCSSNumber(aAngle.GetAngleValue(), aResult);
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// Append unit.
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switch (aAngle.GetUnit()) {
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case eStyleUnit_Degree: aResult.AppendLiteral("deg"); break;
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case eStyleUnit_Grad: aResult.AppendLiteral("grad"); break;
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case eStyleUnit_Radian: aResult.AppendLiteral("rad"); break;
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case eStyleUnit_Turn: aResult.AppendLiteral("turn"); break;
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default: NS_NOTREACHED("unrecognized angle unit");
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}
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}
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/* static */ void
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nsStyleUtil::AppendPaintOrderValue(uint8_t aValue,
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nsAString& aResult)
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{
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static_assert
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(NS_STYLE_PAINT_ORDER_BITWIDTH * NS_STYLE_PAINT_ORDER_LAST_VALUE <= 8,
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"SVGStyleStruct::mPaintOrder and local variables not big enough");
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if (aValue == NS_STYLE_PAINT_ORDER_NORMAL) {
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aResult.AppendLiteral("normal");
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return;
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}
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// Append the minimal value necessary for the given paint order.
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static_assert(NS_STYLE_PAINT_ORDER_LAST_VALUE == 3,
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"paint-order values added; check serialization");
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// The following relies on the default order being the order of the
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// constant values.
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const uint8_t MASK = (1 << NS_STYLE_PAINT_ORDER_BITWIDTH) - 1;
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uint32_t lastPositionToSerialize = 0;
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for (uint32_t position = NS_STYLE_PAINT_ORDER_LAST_VALUE - 1;
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position > 0;
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position--) {
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uint8_t component =
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(aValue >> (position * NS_STYLE_PAINT_ORDER_BITWIDTH)) & MASK;
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uint8_t earlierComponent =
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(aValue >> ((position - 1) * NS_STYLE_PAINT_ORDER_BITWIDTH)) & MASK;
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if (component < earlierComponent) {
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lastPositionToSerialize = position - 1;
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break;
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}
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}
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for (uint32_t position = 0; position <= lastPositionToSerialize; position++) {
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if (position > 0) {
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aResult.Append(' ');
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}
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uint8_t component = aValue & MASK;
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switch (component) {
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case NS_STYLE_PAINT_ORDER_FILL:
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aResult.AppendLiteral("fill");
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break;
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case NS_STYLE_PAINT_ORDER_STROKE:
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aResult.AppendLiteral("stroke");
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break;
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case NS_STYLE_PAINT_ORDER_MARKERS:
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aResult.AppendLiteral("markers");
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break;
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default:
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NS_NOTREACHED("unexpected paint-order component value");
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}
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aValue >>= NS_STYLE_PAINT_ORDER_BITWIDTH;
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}
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}
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/* static */ void
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nsStyleUtil::AppendFontFeatureSettings(const nsTArray<gfxFontFeature>& aFeatures,
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nsAString& aResult)
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{
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for (uint32_t i = 0, numFeat = aFeatures.Length(); i < numFeat; i++) {
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const gfxFontFeature& feat = aFeatures[i];
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if (i != 0) {
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aResult.AppendLiteral(", ");
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}
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// output tag
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char tag[7];
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tag[0] = '"';
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tag[1] = (feat.mTag >> 24) & 0xff;
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tag[2] = (feat.mTag >> 16) & 0xff;
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tag[3] = (feat.mTag >> 8) & 0xff;
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tag[4] = feat.mTag & 0xff;
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tag[5] = '"';
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tag[6] = 0;
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aResult.AppendASCII(tag);
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// output value, if necessary
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if (feat.mValue == 0) {
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// 0 ==> off
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aResult.AppendLiteral(" off");
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} else if (feat.mValue > 1) {
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aResult.Append(' ');
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aResult.AppendInt(feat.mValue);
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}
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// else, omit value if 1, implied by default
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}
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}
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/* static */ void
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nsStyleUtil::AppendFontFeatureSettings(const nsCSSValue& aSrc,
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nsAString& aResult)
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{
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nsCSSUnit unit = aSrc.GetUnit();
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if (unit == eCSSUnit_Normal) {
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aResult.AppendLiteral("normal");
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return;
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}
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NS_PRECONDITION(unit == eCSSUnit_PairList || unit == eCSSUnit_PairListDep,
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"improper value unit for font-feature-settings:");
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nsTArray<gfxFontFeature> featureSettings;
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nsRuleNode::ComputeFontFeatures(aSrc.GetPairListValue(), featureSettings);
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AppendFontFeatureSettings(featureSettings, aResult);
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}
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/* static */ void
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nsStyleUtil::GetFunctionalAlternatesName(int32_t aFeature,
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nsAString& aFeatureName)
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{
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aFeatureName.Truncate();
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nsCSSKeyword key =
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nsCSSProps::ValueToKeywordEnum(aFeature,
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nsCSSProps::kFontVariantAlternatesFuncsKTable);
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NS_ASSERTION(key != eCSSKeyword_UNKNOWN, "bad alternate feature type");
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AppendUTF8toUTF16(nsCSSKeywords::GetStringValue(key), aFeatureName);
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}
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/* static */ void
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nsStyleUtil::SerializeFunctionalAlternates(
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const nsTArray<gfxAlternateValue>& aAlternates,
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nsAString& aResult)
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{
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nsAutoString funcName, funcParams;
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uint32_t numValues = aAlternates.Length();
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uint32_t feature = 0;
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for (uint32_t i = 0; i < numValues; i++) {
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const gfxAlternateValue& v = aAlternates.ElementAt(i);
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if (feature != v.alternate) {
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feature = v.alternate;
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if (!funcName.IsEmpty() && !funcParams.IsEmpty()) {
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if (!aResult.IsEmpty()) {
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aResult.Append(char16_t(' '));
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}
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// append the previous functional value
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aResult.Append(funcName);
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aResult.Append(char16_t('('));
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aResult.Append(funcParams);
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aResult.Append(char16_t(')'));
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}
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// function name
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GetFunctionalAlternatesName(v.alternate, funcName);
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NS_ASSERTION(!funcName.IsEmpty(), "unknown property value name");
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// function params
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funcParams.Truncate();
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AppendEscapedCSSIdent(v.value, funcParams);
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} else {
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if (!funcParams.IsEmpty()) {
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funcParams.AppendLiteral(", ");
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}
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AppendEscapedCSSIdent(v.value, funcParams);
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}
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}
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// append the previous functional value
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if (!funcName.IsEmpty() && !funcParams.IsEmpty()) {
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if (!aResult.IsEmpty()) {
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aResult.Append(char16_t(' '));
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}
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aResult.Append(funcName);
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aResult.Append(char16_t('('));
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aResult.Append(funcParams);
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aResult.Append(char16_t(')'));
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}
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}
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/* static */ void
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nsStyleUtil::ComputeFunctionalAlternates(const nsCSSValueList* aList,
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nsTArray<gfxAlternateValue>& aAlternateValues)
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{
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gfxAlternateValue v;
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aAlternateValues.Clear();
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for (const nsCSSValueList* curr = aList; curr != nullptr; curr = curr->mNext) {
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// list contains function units
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if (curr->mValue.GetUnit() != eCSSUnit_Function) {
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continue;
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}
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// element 0 is the propval in ident form
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const nsCSSValue::Array *func = curr->mValue.GetArrayValue();
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// lookup propval
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nsCSSKeyword key = func->Item(0).GetKeywordValue();
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NS_ASSERTION(key != eCSSKeyword_UNKNOWN, "unknown alternate property value");
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int32_t alternate;
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if (key == eCSSKeyword_UNKNOWN ||
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!nsCSSProps::FindKeyword(key,
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nsCSSProps::kFontVariantAlternatesFuncsKTable,
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alternate)) {
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NS_NOTREACHED("keyword not a font-variant-alternates value");
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continue;
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}
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v.alternate = alternate;
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// other elements are the idents associated with the propval
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// append one alternate value for each one
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uint32_t numElems = func->Count();
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for (uint32_t i = 1; i < numElems; i++) {
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const nsCSSValue& value = func->Item(i);
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NS_ASSERTION(value.GetUnit() == eCSSUnit_Ident,
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"weird unit found in variant alternate");
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if (value.GetUnit() != eCSSUnit_Ident) {
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continue;
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}
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value.GetStringValue(v.value);
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aAlternateValues.AppendElement(v);
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}
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}
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}
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// print all characters with at least four hex digits
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static void
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AppendSerializedUnicodePoint(uint32_t aCode, nsACString& aBuf)
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{
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aBuf.Append(nsPrintfCString("%04X", aCode));
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}
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// A unicode-range: descriptor is represented as an array of integers,
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// to be interpreted as a sequence of pairs: min max min max ...
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// It is in source order. (Possibly it should be sorted and overlaps
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// consolidated, but right now we don't do that.)
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/* static */ void
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nsStyleUtil::AppendUnicodeRange(const nsCSSValue& aValue, nsAString& aResult)
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{
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NS_PRECONDITION(aValue.GetUnit() == eCSSUnit_Null ||
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aValue.GetUnit() == eCSSUnit_Array,
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"improper value unit for unicode-range:");
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aResult.Truncate();
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if (aValue.GetUnit() != eCSSUnit_Array)
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return;
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nsCSSValue::Array const & sources = *aValue.GetArrayValue();
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nsAutoCString buf;
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MOZ_ASSERT(sources.Count() % 2 == 0,
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"odd number of entries in a unicode-range: array");
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for (uint32_t i = 0; i < sources.Count(); i += 2) {
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uint32_t min = sources[i].GetIntValue();
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uint32_t max = sources[i+1].GetIntValue();
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// We don't try to replicate the U+XX?? notation.
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buf.AppendLiteral("U+");
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AppendSerializedUnicodePoint(min, buf);
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if (min != max) {
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buf.Append('-');
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AppendSerializedUnicodePoint(max, buf);
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}
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buf.AppendLiteral(", ");
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}
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buf.Truncate(buf.Length() - 2); // remove the last comma-space
|
|
CopyASCIItoUTF16(buf, aResult);
|
|
}
|
|
|
|
/* static */ void
|
|
nsStyleUtil::AppendSerializedFontSrc(const nsCSSValue& aValue,
|
|
nsAString& aResult)
|
|
{
|
|
// A src: descriptor is represented as an array value; each entry in
|
|
// the array can be eCSSUnit_URL, eCSSUnit_Local_Font, or
|
|
// eCSSUnit_Font_Format. Blocks of eCSSUnit_Font_Format may appear
|
|
// only after one of the first two. (css3-fonts only contemplates
|
|
// annotating URLs with formats, but we handle the general case.)
|
|
|
|
NS_PRECONDITION(aValue.GetUnit() == eCSSUnit_Array,
|
|
"improper value unit for src:");
|
|
|
|
const nsCSSValue::Array& sources = *aValue.GetArrayValue();
|
|
size_t i = 0;
|
|
|
|
while (i < sources.Count()) {
|
|
nsAutoString formats;
|
|
|
|
if (sources[i].GetUnit() == eCSSUnit_URL) {
|
|
aResult.AppendLiteral("url(");
|
|
nsDependentString url(sources[i].GetOriginalURLValue());
|
|
nsStyleUtil::AppendEscapedCSSString(url, aResult);
|
|
aResult.Append(')');
|
|
} else if (sources[i].GetUnit() == eCSSUnit_Local_Font) {
|
|
aResult.AppendLiteral("local(");
|
|
nsDependentString local(sources[i].GetStringBufferValue());
|
|
nsStyleUtil::AppendEscapedCSSString(local, aResult);
|
|
aResult.Append(')');
|
|
} else {
|
|
NS_NOTREACHED("entry in src: descriptor with improper unit");
|
|
i++;
|
|
continue;
|
|
}
|
|
|
|
i++;
|
|
formats.Truncate();
|
|
while (i < sources.Count() &&
|
|
sources[i].GetUnit() == eCSSUnit_Font_Format) {
|
|
formats.Append('"');
|
|
formats.Append(sources[i].GetStringBufferValue());
|
|
formats.AppendLiteral("\", ");
|
|
i++;
|
|
}
|
|
if (formats.Length() > 0) {
|
|
formats.Truncate(formats.Length() - 2); // remove the last comma
|
|
aResult.AppendLiteral(" format(");
|
|
aResult.Append(formats);
|
|
aResult.Append(')');
|
|
}
|
|
aResult.AppendLiteral(", ");
|
|
}
|
|
aResult.Truncate(aResult.Length() - 2); // remove the last comma-space
|
|
}
|
|
|
|
/* static */ float
|
|
nsStyleUtil::ColorComponentToFloat(uint8_t aAlpha)
|
|
{
|
|
// Alpha values are expressed as decimals, so we should convert
|
|
// back, using as few decimal places as possible for
|
|
// round-tripping.
|
|
// First try two decimal places:
|
|
float rounded = NS_roundf(float(aAlpha) * 100.0f / 255.0f) / 100.0f;
|
|
if (FloatToColorComponent(rounded) != aAlpha) {
|
|
// Use three decimal places.
|
|
rounded = NS_roundf(float(aAlpha) * 1000.0f / 255.0f) / 1000.0f;
|
|
}
|
|
return rounded;
|
|
}
|
|
|
|
/* static */ bool
|
|
nsStyleUtil::IsSignificantChild(nsIContent* aChild, bool aTextIsSignificant,
|
|
bool aWhitespaceIsSignificant)
|
|
{
|
|
NS_ASSERTION(!aWhitespaceIsSignificant || aTextIsSignificant,
|
|
"Nonsensical arguments");
|
|
|
|
bool isText = aChild->IsNodeOfType(nsINode::eTEXT);
|
|
|
|
if (!isText && !aChild->IsNodeOfType(nsINode::eCOMMENT) &&
|
|
!aChild->IsNodeOfType(nsINode::ePROCESSING_INSTRUCTION)) {
|
|
return true;
|
|
}
|
|
|
|
return aTextIsSignificant && isText && aChild->TextLength() != 0 &&
|
|
(aWhitespaceIsSignificant ||
|
|
!aChild->TextIsOnlyWhitespace());
|
|
}
|
|
|
|
// For a replaced element whose concrete object size is no larger than the
|
|
// element's content-box, this method checks whether the given
|
|
// "object-position" coordinate might cause overflow in its dimension.
|
|
typedef nsStyleBackground::Position::PositionCoord PositionCoord;
|
|
static bool
|
|
ObjectPositionCoordMightCauseOverflow(const PositionCoord& aCoord)
|
|
{
|
|
// Any nonzero length in "object-position" can push us to overflow
|
|
// (particularly if our concrete object size is exactly the same size as the
|
|
// replaced element's content-box).
|
|
if (aCoord.mLength != 0) {
|
|
return true;
|
|
}
|
|
|
|
// Percentages are interpreted as a fraction of the extra space. So,
|
|
// percentages in the 0-100% range are safe, but values outside of that
|
|
// range could cause overflow.
|
|
if (aCoord.mHasPercent &&
|
|
(aCoord.mPercent < 0.0f || aCoord.mPercent > 1.0f)) {
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
|
|
/* static */ bool
|
|
nsStyleUtil::ObjectPropsMightCauseOverflow(const nsStylePosition* aStylePos)
|
|
{
|
|
auto objectFit = aStylePos->mObjectFit;
|
|
|
|
// "object-fit: cover" & "object-fit: none" can give us a render rect that's
|
|
// larger than our container element's content-box.
|
|
if (objectFit == NS_STYLE_OBJECT_FIT_COVER ||
|
|
objectFit == NS_STYLE_OBJECT_FIT_NONE) {
|
|
return true;
|
|
}
|
|
// (All other object-fit values produce a concrete object size that's no larger
|
|
// than the constraint region.)
|
|
|
|
// Check each of our "object-position" coords to see if it could cause
|
|
// overflow in its dimension:
|
|
const nsStyleBackground::Position& objectPosistion = aStylePos->mObjectPosition;
|
|
if (ObjectPositionCoordMightCauseOverflow(objectPosistion.mXPosition) ||
|
|
ObjectPositionCoordMightCauseOverflow(objectPosistion.mYPosition)) {
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
|
|
/* static */ bool
|
|
nsStyleUtil::CSPAllowsInlineStyle(nsIContent* aContent,
|
|
nsIPrincipal* aPrincipal,
|
|
nsIURI* aSourceURI,
|
|
uint32_t aLineNumber,
|
|
const nsSubstring& aStyleText,
|
|
nsresult* aRv)
|
|
{
|
|
nsresult rv;
|
|
|
|
if (aRv) {
|
|
*aRv = NS_OK;
|
|
}
|
|
|
|
MOZ_ASSERT(!aContent || aContent->Tag() == nsGkAtoms::style,
|
|
"aContent passed to CSPAllowsInlineStyle "
|
|
"for an element that is not <style>");
|
|
|
|
nsCOMPtr<nsIContentSecurityPolicy> csp;
|
|
rv = aPrincipal->GetCsp(getter_AddRefs(csp));
|
|
|
|
if (NS_FAILED(rv)) {
|
|
if (aRv)
|
|
*aRv = rv;
|
|
return false;
|
|
}
|
|
|
|
if (!csp) {
|
|
// No CSP --> the style is allowed
|
|
return true;
|
|
}
|
|
|
|
// An inline style can be allowed because all inline styles are allowed,
|
|
// or else because it is whitelisted by a nonce-source or hash-source. This
|
|
// is a logical OR between whitelisting methods, so the allowInlineStyle
|
|
// outparam can be reused for each check as long as we stop checking as soon
|
|
// as it is set to true. This also optimizes performance by avoiding the
|
|
// overhead of unnecessary checks.
|
|
bool allowInlineStyle = true;
|
|
nsAutoTArray<unsigned short, 3> violations;
|
|
|
|
bool reportInlineViolation;
|
|
rv = csp->GetAllowsInlineStyle(&reportInlineViolation, &allowInlineStyle);
|
|
if (NS_FAILED(rv)) {
|
|
if (aRv)
|
|
*aRv = rv;
|
|
return false;
|
|
}
|
|
if (reportInlineViolation) {
|
|
violations.AppendElement(static_cast<unsigned short>(
|
|
nsIContentSecurityPolicy::VIOLATION_TYPE_INLINE_STYLE));
|
|
}
|
|
|
|
nsAutoString nonce;
|
|
if (!allowInlineStyle) {
|
|
// We can only find a nonce if aContent is provided
|
|
bool foundNonce = !!aContent &&
|
|
aContent->GetAttr(kNameSpaceID_None, nsGkAtoms::nonce, nonce);
|
|
if (foundNonce) {
|
|
bool reportNonceViolation;
|
|
rv = csp->GetAllowsNonce(nonce, nsIContentPolicy::TYPE_STYLESHEET,
|
|
&reportNonceViolation, &allowInlineStyle);
|
|
if (NS_FAILED(rv)) {
|
|
if (aRv)
|
|
*aRv = rv;
|
|
return false;
|
|
}
|
|
|
|
if (reportNonceViolation) {
|
|
violations.AppendElement(static_cast<unsigned short>(
|
|
nsIContentSecurityPolicy::VIOLATION_TYPE_NONCE_STYLE));
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!allowInlineStyle) {
|
|
bool reportHashViolation;
|
|
rv = csp->GetAllowsHash(aStyleText, nsIContentPolicy::TYPE_STYLESHEET,
|
|
&reportHashViolation, &allowInlineStyle);
|
|
if (NS_FAILED(rv)) {
|
|
if (aRv)
|
|
*aRv = rv;
|
|
return false;
|
|
}
|
|
if (reportHashViolation) {
|
|
violations.AppendElement(static_cast<unsigned short>(
|
|
nsIContentSecurityPolicy::VIOLATION_TYPE_HASH_STYLE));
|
|
}
|
|
}
|
|
|
|
// What violation(s) should be reported?
|
|
//
|
|
// 1. If the style tag has a nonce attribute, and the nonce does not match
|
|
// the policy, report VIOLATION_TYPE_NONCE_STYLE.
|
|
// 2. If the policy has at least one hash-source, and the hashed contents of
|
|
// the style tag did not match any of them, report VIOLATION_TYPE_HASH_STYLE
|
|
// 3. Otherwise, report VIOLATION_TYPE_INLINE_STYLE if appropriate.
|
|
//
|
|
// 1 and 2 may occur together, 3 should only occur by itself. Naturally,
|
|
// every VIOLATION_TYPE_NONCE_STYLE and VIOLATION_TYPE_HASH_STYLE are also
|
|
// VIOLATION_TYPE_INLINE_STYLE, but reporting the
|
|
// VIOLATION_TYPE_INLINE_STYLE is redundant and does not help the developer.
|
|
if (!violations.IsEmpty()) {
|
|
MOZ_ASSERT(violations[0] == nsIContentSecurityPolicy::VIOLATION_TYPE_INLINE_STYLE,
|
|
"How did we get any violations without an initial inline style violation?");
|
|
// This inline style is not allowed by CSP, so report the violation
|
|
nsAutoCString asciiSpec;
|
|
aSourceURI->GetAsciiSpec(asciiSpec);
|
|
nsAutoString styleSample(aStyleText);
|
|
|
|
// cap the length of the style sample at 40 chars.
|
|
if (styleSample.Length() > 40) {
|
|
styleSample.Truncate(40);
|
|
styleSample.AppendLiteral("...");
|
|
}
|
|
|
|
for (uint32_t i = 0; i < violations.Length(); i++) {
|
|
// Skip reporting the redundant inline style violation if there are
|
|
// other (nonce and/or hash violations) as well.
|
|
if (i > 0 || violations.Length() == 1) {
|
|
csp->LogViolationDetails(violations[i], NS_ConvertUTF8toUTF16(asciiSpec),
|
|
styleSample, aLineNumber, nonce, aStyleText);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!allowInlineStyle) {
|
|
NS_ASSERTION(!violations.IsEmpty(),
|
|
"CSP blocked inline style but is not reporting a violation");
|
|
// The inline style should be blocked.
|
|
return false;
|
|
}
|
|
// CSP allows inline styles.
|
|
return true;
|
|
}
|