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/*
* Copyright (C) 2010 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"
#include "FileReaderLoader.h"
#include "Blob.h"
#include "BlobURL.h"
#include "ExceptionCode.h"
#include "FileReaderLoaderClient.h"
#include "HTTPHeaderNames.h"
#include "ResourceError.h"
#include "ResourceRequest.h"
#include "ResourceResponse.h"
#include "ScriptExecutionContext.h"
#include "TextResourceDecoder.h"
#include "ThreadableBlobRegistry.h"
#include "ThreadableLoader.h"
#include <JavaScriptCore/ArrayBuffer.h>
#include <wtf/RefPtr.h>
#include <wtf/Vector.h>
#include <wtf/text/Base64.h>
#include <wtf/text/StringBuilder.h>
namespace WebCore {
const int defaultBufferLength = 32768;
FileReaderLoader::FileReaderLoader(ReadType readType, FileReaderLoaderClient* client)
: m_readType(readType)
, m_client(client)
, m_isRawDataConverted(false)
, m_stringResult(emptyString())
, m_variableLength(false)
, m_bytesLoaded(0)
, m_totalBytes(0)
{
}
FileReaderLoader::~FileReaderLoader()
{
terminate();
if (!m_urlForReading.isEmpty())
ThreadableBlobRegistry::unregisterBlobURL(m_urlForReading);
}
void FileReaderLoader::start(ScriptExecutionContext* scriptExecutionContext, Blob& blob)
{
ASSERT(scriptExecutionContext);
// The blob is read by routing through the request handling layer given a temporary public url.
m_urlForReading = BlobURL::createPublicURL(scriptExecutionContext->securityOrigin());
if (m_urlForReading.isEmpty()) {
failed(SecurityError);
return;
}
ThreadableBlobRegistry::registerBlobURL(scriptExecutionContext->securityOrigin(), scriptExecutionContext->policyContainer(), m_urlForReading, blob.url());
// Construct and load the request.
ResourceRequest request(m_urlForReading);
request.setHTTPMethod("GET");
ThreadableLoaderOptions options;
options.sendLoadCallbacks = SendCallbackPolicy::SendCallbacks;
options.dataBufferingPolicy = DataBufferingPolicy::DoNotBufferData;
options.credentials = FetchOptions::Credentials::Include;
options.mode = FetchOptions::Mode::SameOrigin;
options.contentSecurityPolicyEnforcement = ContentSecurityPolicyEnforcement::DoNotEnforce;
if (m_client)
m_loader = ThreadableLoader::create(*scriptExecutionContext, *this, WTFMove(request), options);
else
ThreadableLoader::loadResourceSynchronously(*scriptExecutionContext, WTFMove(request), *this, options);
}
void FileReaderLoader::cancel()
{
m_errorCode = AbortError;
terminate();
}
void FileReaderLoader::terminate()
{
if (m_loader) {
m_loader->cancel();
cleanup();
}
}
void FileReaderLoader::cleanup()
{
m_loader = nullptr;
// If we get any error, we do not need to keep a buffer around.
if (m_errorCode) {
m_rawData = nullptr;
m_stringResult = emptyString();
}
}
void FileReaderLoader::didReceiveResponse(ResourceLoaderIdentifier, const ResourceResponse& response)
{
if (response.httpStatusCode() != 200) {
failed(httpStatusCodeToErrorCode(response.httpStatusCode()));
return;
}
long long length = response.expectedContentLength();
// A negative value means that the content length wasn't specified, so the buffer will need to be dynamically grown.
if (length < 0) {
m_variableLength = true;
length = defaultBufferLength;
}
// Check that we can cast to unsigned since we have to do
// so to call ArrayBuffer's create function.
// FIXME: Support reading more than the current size limit of ArrayBuffer.
if (length > std::numeric_limits<unsigned>::max()) {
failed(NotReadableError);
return;
}
ASSERT(!m_rawData);
m_rawData = ArrayBuffer::tryCreate(static_cast<unsigned>(length), 1);
if (!m_rawData) {
failed(NotReadableError);
return;
}
m_totalBytes = static_cast<unsigned>(length);
if (m_client)
m_client->didStartLoading();
}
void FileReaderLoader::didReceiveData(const uint8_t* data, int dataLength)
{
ASSERT(data);
ASSERT(dataLength > 0);
// Bail out if we already encountered an error.
if (m_errorCode)
return;
int length = dataLength;
unsigned remainingBufferSpace = m_totalBytes - m_bytesLoaded;
if (length > static_cast<long long>(remainingBufferSpace)) {
// If the buffer has hit maximum size, it can't be grown any more.
if (m_totalBytes >= std::numeric_limits<unsigned>::max()) {
failed(NotReadableError);
return;
}
if (m_variableLength) {
unsigned newLength = m_totalBytes + static_cast<unsigned>(dataLength);
if (newLength < m_totalBytes) {
failed(NotReadableError);
return;
}
newLength = std::max(newLength, m_totalBytes + m_totalBytes / 4 + 1);
auto newData = ArrayBuffer::tryCreate(newLength, 1);
if (!newData) {
// Not enough memory.
failed(NotReadableError);
return;
}
memcpy(static_cast<char*>(newData->data()), static_cast<char*>(m_rawData->data()), m_bytesLoaded);
m_rawData = newData;
m_totalBytes = static_cast<unsigned>(newLength);
} else {
// This can only happen if we get more data than indicated in expected content length (i.e. never, unless the networking layer is buggy).
length = remainingBufferSpace;
}
}
if (length <= 0)
return;
memcpy(static_cast<char*>(m_rawData->data()) + m_bytesLoaded, data, length);
m_bytesLoaded += length;
m_isRawDataConverted = false;
if (m_client)
m_client->didReceiveData();
}
void FileReaderLoader::didFinishLoading(ResourceLoaderIdentifier)
{
if (m_variableLength && m_totalBytes > m_bytesLoaded) {
m_rawData = m_rawData->slice(0, m_bytesLoaded);
m_totalBytes = m_bytesLoaded;
}
cleanup();
if (m_client)
m_client->didFinishLoading();
}
void FileReaderLoader::didFail(const ResourceError& error)
{
// If we're aborting, do not proceed with normal error handling since it is covered in aborting code.
if (m_errorCode && m_errorCode.value() == AbortError)
return;
failed(toErrorCode(static_cast<BlobResourceHandle::Error>(error.errorCode())));
}
void FileReaderLoader::failed(ExceptionCode errorCode)
{
m_errorCode = errorCode;
cleanup();
if (m_client)
m_client->didFail(errorCode);
}
ExceptionCode FileReaderLoader::toErrorCode(BlobResourceHandle::Error error)
{
switch (error) {
case BlobResourceHandle::Error::NotFoundError:
return NotFoundError;
default:
return NotReadableError;
}
}
ExceptionCode FileReaderLoader::httpStatusCodeToErrorCode(int httpStatusCode)
{
switch (httpStatusCode) {
case 403:
return SecurityError;
default:
return NotReadableError;
}
}
RefPtr<ArrayBuffer> FileReaderLoader::arrayBufferResult() const
{
ASSERT(m_readType == ReadAsArrayBuffer);
// If the loading is not started or an error occurs, return an empty result.
if (!m_rawData || m_errorCode)
return nullptr;
// If completed, we can simply return our buffer.
if (isCompleted())
return m_rawData;
// Otherwise, return a copy.
return ArrayBuffer::create(*m_rawData);
}
String FileReaderLoader::stringResult()
{
ASSERT(m_readType != ReadAsArrayBuffer && m_readType != ReadAsBlob);
// If the loading is not started or an error occurs, return an empty result.
if (!m_rawData || m_errorCode)
return m_stringResult;
// If already converted from the raw data, return the result now.
if (m_isRawDataConverted)
return m_stringResult;
switch (m_readType) {
case ReadAsArrayBuffer:
// No conversion is needed.
break;
case ReadAsBinaryString:
m_stringResult = String(static_cast<const char*>(m_rawData->data()), m_bytesLoaded);
break;
case ReadAsText:
convertToText();
break;
case ReadAsDataURL:
// Partial data is not supported when reading as data URL.
if (isCompleted())
convertToDataURL();
break;
default:
ASSERT_NOT_REACHED();
}
return m_stringResult;
}
void FileReaderLoader::convertToText()
{
if (!m_bytesLoaded)
return;
// Decode the data.
// The File API spec says that we should use the supplied encoding if it is valid. However, we choose to ignore this
// requirement in order to be consistent with how WebKit decodes the web content: always has the BOM override the
// provided encoding.
// FIXME: consider supporting incremental decoding to improve the perf.
if (!m_decoder)
m_decoder = TextResourceDecoder::create("text/plain", m_encoding.isValid() ? m_encoding : UTF8Encoding());
if (isCompleted())
m_stringResult = m_decoder->decodeAndFlush(static_cast<const char*>(m_rawData->data()), m_bytesLoaded);
else
m_stringResult = m_decoder->decode(static_cast<const char*>(m_rawData->data()), m_bytesLoaded);
}
void FileReaderLoader::convertToDataURL()
{
if (!m_bytesLoaded) {
m_stringResult = "data:"_s;
return;
}
m_stringResult = makeString("data:", m_dataType.isEmpty() ? "application/octet-stream" : m_dataType, ";base64,", base64Encoded(m_rawData->data(), m_bytesLoaded));
}
bool FileReaderLoader::isCompleted() const
{
return m_bytesLoaded == m_totalBytes;
}
void FileReaderLoader::setEncoding(const String& encoding)
{
if (!encoding.isEmpty())
m_encoding = TextEncoding(encoding);
}
} // namespace WebCore