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/*
* Copyright (C) 2011 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#if ENABLE(MHTML)
#include "MHTMLArchive.h"
#include "Document.h"
#include "LegacySchemeRegistry.h"
#include "LocalFrame.h"
#include "MHTMLParser.h"
#include "MIMETypeRegistry.h"
#include "Page.h"
#include "PageSerializer.h"
#include "QuotedPrintable.h"
#include "SharedBuffer.h"
#include <time.h>
#include <wtf/CryptographicallyRandomNumber.h>
#include <wtf/DateMath.h>
#include <wtf/GregorianDateTime.h>
#include <wtf/StdLibExtras.h>
#include <wtf/text/Base64.h>
#include <wtf/text/StringBuilder.h>
#if HAVE(SYS_TIME_H)
#include <sys/time.h>
#endif
namespace WebCore {
constexpr auto quotedPrintable = "quoted-printable"_s;
constexpr auto base64 = "base64"_s;
static String generateRandomBoundary()
{
// Trying to generate random boundaries similar to IE/UnMHT (ex: ----=_NextPart_000_001B_01CC157B.96F808A0).
constexpr size_t randomValuesLength = 10;
std::array<uint8_t, randomValuesLength> randomValues;
cryptographicallyRandomValues(randomValues);
StringBuilder stringBuilder;
stringBuilder.append("----=_NextPart_000_"_s);
for (size_t i = 0; i < randomValues.size(); ++i) {
if (i == 2)
stringBuilder.append('_');
else if (i == 6)
stringBuilder.append('.');
stringBuilder.append(lowerNibbleToASCIIHexDigit(randomValues[i]));
stringBuilder.append(upperNibbleToASCIIHexDigit(randomValues[i]));
}
return stringBuilder.toString();
}
static String replaceNonPrintableCharacters(const String& text)
{
StringBuilder stringBuilder;
for (size_t i = 0; i < text.length(); ++i) {
if (isASCIIPrintable(text[i]))
stringBuilder.append(text[i]);
else
stringBuilder.append('?');
}
return stringBuilder.toString();
}
MHTMLArchive::MHTMLArchive()
{
}
MHTMLArchive::~MHTMLArchive()
{
// Because all frames know about each other we need to perform a deep clearing of the archives graph.
clearAllSubframeArchives();
}
Ref<MHTMLArchive> MHTMLArchive::create()
{
return adoptRef(*new MHTMLArchive);
}
RefPtr<MHTMLArchive> MHTMLArchive::create(const URL& url, FragmentedSharedBuffer& data)
{
// For security reasons we only load MHTML pages from local URLs.
if (!LegacySchemeRegistry::shouldTreatURLSchemeAsLocal(url.protocol()))
return nullptr;
MHTMLParser parser(&data);
RefPtr<MHTMLArchive> mainArchive = parser.parseArchive();
if (!mainArchive)
return nullptr; // Invalid MHTML file.
// Since MHTML is a flat format, we need to make all frames aware of all resources.
for (size_t i = 0; i < parser.frameCount(); ++i) {
RefPtr<MHTMLArchive> archive = parser.frameAt(i);
for (size_t j = 1; j < parser.frameCount(); ++j) {
if (i != j)
archive->addSubframeArchive(*parser.frameAt(j));
}
for (size_t j = 0; j < parser.subResourceCount(); ++j)
archive->addSubresource(*parser.subResourceAt(j));
}
return mainArchive;
}
Ref<FragmentedSharedBuffer> MHTMLArchive::generateMHTMLData(Page* page)
{
Vector<PageSerializer::Resource> resources;
PageSerializer pageSerializer(resources);
pageSerializer.serialize(*page);
String boundary = generateRandomBoundary();
String endOfResourceBoundary = makeString("--"_s, boundary, "\r\n"_s);
GregorianDateTime now;
now.setToCurrentLocalTime();
String dateString = makeRFC2822DateString(now.weekDay(), now.monthDay(), now.month(), now.year(), now.hour(), now.minute(), now.second(), now.utcOffsetInMinute());
StringBuilder stringBuilder;
stringBuilder.append("From: <Saved by WebKit>\r\n"_s);
auto* localMainFrame = dynamicDowncast<LocalFrame>(page->mainFrame());
if (localMainFrame) {
stringBuilder.append("Subject: "_s);
// We replace non ASCII characters with '?' characters to match IE's behavior.
stringBuilder.append(replaceNonPrintableCharacters(localMainFrame->document()->title()));
}
stringBuilder.append("\r\nDate: "_s, dateString,
"\r\nMIME-Version: 1.0\r\nContent-Type: multipart/related;\r\n"_s);
if (localMainFrame)
stringBuilder.append("\ttype=\""_s, localMainFrame->document()->suggestedMIMEType());
stringBuilder.append("\";\r\n\tboundary=\""_s, boundary, "\"\r\n\r\n"_s);
ASSERT(stringBuilder.toString().containsOnlyASCII());
CString asciiString = stringBuilder.toString().utf8();
SharedBufferBuilder mhtmlData;
mhtmlData.append(asciiString.span());
for (auto& resource : resources) {
stringBuilder.clear();
stringBuilder.append(endOfResourceBoundary, "Content-Type: "_s, resource.mimeType);
ASCIILiteral contentEncoding;
if (MIMETypeRegistry::isSupportedJavaScriptMIMEType(resource.mimeType) || MIMETypeRegistry::isSupportedNonImageMIMEType(resource.mimeType))
contentEncoding = quotedPrintable;
else
contentEncoding = base64;
stringBuilder.append("\r\nContent-Transfer-Encoding: "_s, contentEncoding, "\r\nContent-Location: "_s, resource.url.string(), "\r\n\r\n"_s);
asciiString = stringBuilder.toString().utf8();
mhtmlData.append(asciiString.span());
// FIXME: ideally we would encode the content as a stream without having to fetch it all.
if (contentEncoding == quotedPrintable) {
auto encodedData = quotedPrintableEncode(resource.data->span());
mhtmlData.append(encodedData.span());
mhtmlData.append("\r\n"_span);
} else {
ASSERT(contentEncoding == base64);
// We are not specifying insertLFs = true below as it would cut the lines with LFs and MHTML requires CRLFs.
auto encodedData = base64EncodeToVector(resource.data->span());
const size_t maximumLineLength = 76;
size_t index = 0;
size_t encodedDataLength = encodedData.size();
do {
size_t lineLength = std::min(encodedDataLength - index, maximumLineLength);
mhtmlData.append(encodedData.subspan(index, lineLength));
mhtmlData.append("\r\n"_span);
index += maximumLineLength;
} while (index < encodedDataLength);
}
}
asciiString = makeString("--"_s, boundary, "--\r\n"_s).utf8();
mhtmlData.append(asciiString.span());
return mhtmlData.take();
}
}
#endif
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