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// Copyright (C) 2018 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#include "basemessage.h"
#include "jsonrpcmessages.h"
#include "languageserverprotocoltr.h"
#include <QBuffer>
#include <QTextCodec>
#include <cstring>
#include <utility>
namespace lsp {
Q_LOGGING_CATEGORY(parseLog, "qtc.languageserverprotocol.parse", QtWarningMsg)
constexpr char headerFieldSeparator[] = ": ";
constexpr char contentCharsetName[] = "charset";
constexpr char defaultCharset[] = "utf-8";
constexpr char contentLengthFieldName[] = "Content-Length";
constexpr char headerSeparator[] = "\r\n";
constexpr char contentTypeFieldName[] = "Content-Type";
BaseMessage::BaseMessage()
: mimeType(JsonRpcMessage::jsonRpcMimeType())
{ }
BaseMessage::BaseMessage(const QByteArray &mimeType, const QByteArray &content,
int expectedLength, QTextCodec *codec)
: mimeType(mimeType.isEmpty() ? JsonRpcMessage::jsonRpcMimeType() : mimeType)
, content(content)
, contentLength(expectedLength)
, codec(codec)
{ }
BaseMessage::BaseMessage(const QByteArray &mimeType, const QByteArray &content)
: BaseMessage(mimeType, content, content.length(), defaultCodec())
{ }
bool BaseMessage::operator==(const BaseMessage &other) const
{
if (mimeType != other.mimeType || content != other.content)
return false;
if (codec) {
if (other.codec)
return codec->mibEnum() == other.codec->mibEnum();
return codec->mibEnum() == defaultCodec()->mibEnum();
}
if (other.codec)
return other.codec->mibEnum() == defaultCodec()->mibEnum();
return true;
}
static QPair<QByteArray, QByteArray> splitHeaderFieldLine(const QByteArray &headerFieldLine)
{
static const int fieldSeparatorLength = int(std::strlen(headerFieldSeparator));
int assignmentIndex = headerFieldLine.indexOf(headerFieldSeparator);
if (assignmentIndex >= 0) {
return {headerFieldLine.mid(0, assignmentIndex),
headerFieldLine.mid(assignmentIndex + fieldSeparatorLength)};
}
qCWarning(parseLog) << "Unexpected header line:" << QLatin1String(headerFieldLine);
return {};
}
static void parseContentType(BaseMessage &message, QByteArray contentType, QString &parseError)
{
if (contentType.startsWith('"') && contentType.endsWith('"'))
contentType = contentType.mid(1, contentType.length() - 2);
QList<QByteArray> contentTypeElements = contentType.split(';');
QByteArray mimeTypeName = contentTypeElements.takeFirst();
QTextCodec *codec = nullptr;
for (const QByteArray &_contentTypeElement : contentTypeElements) {
const QByteArray &contentTypeElement = _contentTypeElement.trimmed();
if (contentTypeElement.startsWith(contentCharsetName)) {
const int equalindex = contentTypeElement.indexOf('=');
const QByteArray charset = contentTypeElement.mid(equalindex + 1);
if (equalindex > 0)
codec = QTextCodec::codecForName(charset);
if (!codec) {
parseError = Tr::tr("Cannot decode content with \"%1\". Falling back to \"%2\".")
.arg(QLatin1String(charset),
QLatin1String(defaultCharset));
}
}
}
message.mimeType = mimeTypeName;
message.codec = codec ? codec : BaseMessage::defaultCodec();
}
static void parseContentLength(BaseMessage &message, QByteArray contentLength, QString &parseError)
{
bool ok = true;
message.contentLength = contentLength.toInt(&ok);
if (!ok) {
parseError = Tr::tr("Expected an integer in \"%1\", but got \"%2\".")
.arg(QString::fromLatin1(contentLengthFieldName), QString::fromLatin1(contentLength));
}
}
void BaseMessage::parse(QBuffer *data, QString &parseError, BaseMessage &message)
{
const qint64 startPos = data->pos();
if (message.isValid()) { // incomplete message from last parse
message.content.append(data->read(message.contentLength - message.content.length()));
return;
}
while (!data->atEnd()) {
const QByteArray &headerFieldLine = data->readLine();
if (headerFieldLine == headerSeparator) {
if (message.isValid())
message.content = data->read(message.contentLength);
return;
}
const QPair<QByteArray, QByteArray> nameAndValue = splitHeaderFieldLine(headerFieldLine);
const QByteArray &headerFieldName = nameAndValue.first.trimmed();
const QByteArray &headerFieldValue = nameAndValue.second.trimmed();
if (headerFieldName.isEmpty())
continue;
if (headerFieldName == contentLengthFieldName) {
parseContentLength(message, headerFieldValue, parseError);
} else if (headerFieldName == contentTypeFieldName) {
parseContentType(message, headerFieldValue, parseError);
} else {
qCWarning(parseLog) << "Unexpected header field" << QLatin1String(headerFieldName)
<< "in" << QLatin1String(headerFieldLine);
}
}
// the complete header wasn't received jet, waiting for the rest of it and reparse
message = BaseMessage();
data->seek(startPos);
}
QTextCodec *BaseMessage::defaultCodec()
{
static QTextCodec *codec = QTextCodec::codecForName(defaultCharset);
return codec;
}
bool BaseMessage::isComplete() const
{
if (!isValid())
return false;
QBS_ASSERT(content.length() <= contentLength, return true);
return content.length() == contentLength;
}
bool BaseMessage::isValid() const
{
return contentLength >= 0;
}
QByteArray BaseMessage::header() const
{
QByteArray header;
header.append(lengthHeader());
if (codec != defaultCodec()
|| (!mimeType.isEmpty() && mimeType != JsonRpcMessage::jsonRpcMimeType())) {
header.append(typeHeader());
}
header.append(headerSeparator);
return header;
}
QByteArray BaseMessage::lengthHeader() const
{
return QByteArray(contentLengthFieldName)
+ QByteArray(headerFieldSeparator)
+ QString::number(content.size()).toLatin1()
+ QByteArray(headerSeparator);
}
QByteArray BaseMessage::typeHeader() const
{
return QByteArray(contentTypeFieldName)
+ QByteArray(headerFieldSeparator)
+ mimeType + "; " + contentCharsetName + "=" + codec->name()
+ QByteArray(headerSeparator);
}
} // namespace lsp
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