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