207 lines
7.4 KiB
C++
207 lines
7.4 KiB
C++
/*
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Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
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Copyright (C) 2001 Dirk Mueller (mueller@kde.org)
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Copyright (C) 2002 Waldo Bastian (bastian@kde.org)
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Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
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Copyright (C) 2004-2017 Apple Inc. All rights reserved.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public License
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along with this library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA.
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*/
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#include "config.h"
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#include "CachedCSSStyleSheet.h"
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#include "CSSStyleSheet.h"
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#include "CachedResourceClientWalker.h"
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#include "CachedResourceRequest.h"
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#include "CachedStyleSheetClient.h"
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#include "HTTPHeaderNames.h"
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#include "HTTPParsers.h"
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#include "MemoryCache.h"
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#include "ParsedContentType.h"
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#include "SharedBuffer.h"
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#include "StyleSheetContents.h"
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#include "TextResourceDecoder.h"
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namespace WebCore {
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CachedCSSStyleSheet::CachedCSSStyleSheet(CachedResourceRequest&& request, PAL::SessionID sessionID, const CookieJar* cookieJar)
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: CachedResource(WTFMove(request), Type::CSSStyleSheet, sessionID, cookieJar)
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, m_decoder(TextResourceDecoder::create("text/css", request.charset()))
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{
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}
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CachedCSSStyleSheet::~CachedCSSStyleSheet()
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{
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if (m_parsedStyleSheetCache)
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m_parsedStyleSheetCache->removedFromMemoryCache();
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}
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void CachedCSSStyleSheet::didAddClient(CachedResourceClient& client)
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{
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ASSERT(client.resourceClientType() == CachedStyleSheetClient::expectedType());
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// CachedResource::didAddClient() must be before setCSSStyleSheet(),
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// because setCSSStyleSheet() may cause scripts to be executed, which could destroy 'c' if it is an instance of HTMLLinkElement.
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// see the comment of HTMLLinkElement::setCSSStyleSheet.
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CachedResource::didAddClient(client);
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if (!isLoading())
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static_cast<CachedStyleSheetClient&>(client).setCSSStyleSheet(m_resourceRequest.url().string(), m_response.url(), m_decoder->encoding().name(), this);
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}
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void CachedCSSStyleSheet::setEncoding(const String& chs)
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{
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m_decoder->setEncoding(chs, TextResourceDecoder::EncodingFromHTTPHeader);
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}
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String CachedCSSStyleSheet::encoding() const
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{
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return m_decoder->encoding().name();
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}
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const String CachedCSSStyleSheet::sheetText(MIMETypeCheckHint mimeTypeCheckHint, bool* hasValidMIMEType) const
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{
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if (!m_data || m_data->isEmpty() || !canUseSheet(mimeTypeCheckHint, hasValidMIMEType))
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return String();
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if (!m_decodedSheetText.isNull())
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return m_decodedSheetText;
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// Don't cache the decoded text, regenerating is cheap and it can use quite a bit of memory
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return m_decoder->decodeAndFlush(m_data->data(), m_data->size());
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}
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void CachedCSSStyleSheet::setBodyDataFrom(const CachedResource& resource)
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{
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ASSERT(resource.type() == type());
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const CachedCSSStyleSheet& sheet = static_cast<const CachedCSSStyleSheet&>(resource);
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CachedResource::setBodyDataFrom(resource);
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m_decoder = sheet.m_decoder;
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m_decodedSheetText = sheet.m_decodedSheetText;
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if (sheet.m_parsedStyleSheetCache)
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saveParsedStyleSheet(*sheet.m_parsedStyleSheetCache);
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}
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void CachedCSSStyleSheet::finishLoading(SharedBuffer* data, const NetworkLoadMetrics& metrics)
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{
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m_data = data;
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setEncodedSize(data ? data->size() : 0);
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// Decode the data to find out the encoding and keep the sheet text around during checkNotify()
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if (data)
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m_decodedSheetText = m_decoder->decodeAndFlush(data->data(), data->size());
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setLoading(false);
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checkNotify(metrics);
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// Clear the decoded text as it is unlikely to be needed immediately again and is cheap to regenerate.
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m_decodedSheetText = String();
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}
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void CachedCSSStyleSheet::checkNotify(const NetworkLoadMetrics&)
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{
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if (isLoading())
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return;
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CachedResourceClientWalker<CachedStyleSheetClient> w(m_clients);
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while (CachedStyleSheetClient* c = w.next())
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c->setCSSStyleSheet(m_resourceRequest.url().string(), m_response.url(), m_decoder->encoding().name(), this);
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}
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String CachedCSSStyleSheet::responseMIMEType() const
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{
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return extractMIMETypeFromMediaType(m_response.httpHeaderField(HTTPHeaderName::ContentType));
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}
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bool CachedCSSStyleSheet::mimeTypeAllowedByNosniff() const
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{
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return parseContentTypeOptionsHeader(m_response.httpHeaderField(HTTPHeaderName::XContentTypeOptions)) != ContentTypeOptionsDisposition::Nosniff || equalLettersIgnoringASCIICase(responseMIMEType(), "text/css");
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}
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bool CachedCSSStyleSheet::canUseSheet(MIMETypeCheckHint mimeTypeCheckHint, bool* hasValidMIMEType) const
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{
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if (errorOccurred())
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return false;
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if (!mimeTypeAllowedByNosniff()) {
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if (hasValidMIMEType)
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*hasValidMIMEType = false;
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return false;
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}
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if (mimeTypeCheckHint == MIMETypeCheckHint::Lax)
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return true;
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// This check exactly matches Firefox. Note that we grab the Content-Type
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// header directly because we want to see what the value is BEFORE content
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// sniffing. Firefox does this by setting a "type hint" on the channel.
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// This implementation should be observationally equivalent.
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//
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// This code defaults to allowing the stylesheet for non-HTTP protocols so
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// folks can use standards mode for local HTML documents.
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String mimeType = responseMIMEType();
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bool typeOK = mimeType.isEmpty() || equalLettersIgnoringASCIICase(mimeType, "text/css") || equalLettersIgnoringASCIICase(mimeType, "application/x-unknown-content-type") || !isValidContentType(mimeType);
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if (hasValidMIMEType)
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*hasValidMIMEType = typeOK;
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return typeOK;
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}
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void CachedCSSStyleSheet::destroyDecodedData()
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{
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if (!m_parsedStyleSheetCache)
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return;
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m_parsedStyleSheetCache->removedFromMemoryCache();
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m_parsedStyleSheetCache = nullptr;
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setDecodedSize(0);
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}
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RefPtr<StyleSheetContents> CachedCSSStyleSheet::restoreParsedStyleSheet(const CSSParserContext& context, CachePolicy cachePolicy, FrameLoader& loader)
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{
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if (!m_parsedStyleSheetCache)
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return nullptr;
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if (!m_parsedStyleSheetCache->subresourcesAllowReuse(cachePolicy, loader)) {
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m_parsedStyleSheetCache->removedFromMemoryCache();
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m_parsedStyleSheetCache = nullptr;
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return nullptr;
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}
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ASSERT(m_parsedStyleSheetCache->isCacheable());
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ASSERT(m_parsedStyleSheetCache->isInMemoryCache());
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// Contexts must be identical so we know we would get the same exact result if we parsed again.
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if (m_parsedStyleSheetCache->parserContext() != context)
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return nullptr;
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didAccessDecodedData(MonotonicTime::now());
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return m_parsedStyleSheetCache;
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}
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void CachedCSSStyleSheet::saveParsedStyleSheet(Ref<StyleSheetContents>&& sheet)
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{
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ASSERT(sheet->isCacheable());
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if (m_parsedStyleSheetCache)
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m_parsedStyleSheetCache->removedFromMemoryCache();
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m_parsedStyleSheetCache = WTFMove(sheet);
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m_parsedStyleSheetCache->addedToMemoryCache();
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setDecodedSize(m_parsedStyleSheetCache->estimatedSizeInBytes());
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}
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}
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