/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtNetwork module of the Qt Toolkit.
**
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** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights.  These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
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** $QT_END_LICENSE$
**
****************************************************************************/

#include "qhttpnetworkreply_p.h"
#include "qhttpnetworkconnection_p.h"

#include <qbytearraymatcher.h>

#ifndef QT_NO_HTTP

#ifndef QT_NO_OPENSSL
#    include <QtNetwork/qsslkey.h>
#    include <QtNetwork/qsslcipher.h>
#    include <QtNetwork/qsslconfiguration.h>
#endif

QT_BEGIN_NAMESPACE

QHttpNetworkReply::QHttpNetworkReply(const QUrl &url, QObject *parent)
    : QObject(*new QHttpNetworkReplyPrivate(url), parent)
{
}

QHttpNetworkReply::~QHttpNetworkReply()
{
    Q_D(QHttpNetworkReply);
    if (d->connection) {
        d->connection->d_func()->removeReply(this);
    }
}

QUrl QHttpNetworkReply::url() const
{
    return d_func()->url;
}
void QHttpNetworkReply::setUrl(const QUrl &url)
{
    Q_D(QHttpNetworkReply);
    d->url = url;
}

qint64 QHttpNetworkReply::contentLength() const
{
    return d_func()->contentLength();
}

void QHttpNetworkReply::setContentLength(qint64 length)
{
    Q_D(QHttpNetworkReply);
    d->setContentLength(length);
}

QList<QPair<QByteArray, QByteArray> > QHttpNetworkReply::header() const
{
    return d_func()->fields;
}

QByteArray QHttpNetworkReply::headerField(const QByteArray &name, const QByteArray &defaultValue) const
{
    return d_func()->headerField(name, defaultValue);
}

void QHttpNetworkReply::setHeaderField(const QByteArray &name, const QByteArray &data)
{
    Q_D(QHttpNetworkReply);
    d->setHeaderField(name, data);
}

void QHttpNetworkReply::parseHeader(const QByteArray &header)
{
    Q_D(QHttpNetworkReply);
    d->parseHeader(header);
}

QHttpNetworkRequest QHttpNetworkReply::request() const
{
    return d_func()->request;
}

void QHttpNetworkReply::setRequest(const QHttpNetworkRequest &request)
{
    Q_D(QHttpNetworkReply);
    d->request = request;
}

int QHttpNetworkReply::statusCode() const
{
    return d_func()->statusCode;
}

void QHttpNetworkReply::setStatusCode(int code)
{
    Q_D(QHttpNetworkReply);
    d->statusCode = code;
}

QString QHttpNetworkReply::errorString() const
{
    return d_func()->errorString;
}

QString QHttpNetworkReply::reasonPhrase() const
{
    return d_func()->reasonPhrase;
}

void QHttpNetworkReply::setErrorString(const QString &error)
{
    Q_D(QHttpNetworkReply);
    d->errorString = error;
}

int QHttpNetworkReply::majorVersion() const
{
    return d_func()->majorVersion;
}

int QHttpNetworkReply::minorVersion() const
{
    return d_func()->minorVersion;
}

qint64 QHttpNetworkReply::bytesAvailable() const
{
    Q_D(const QHttpNetworkReply);
    if (d->connection)
        return d->connection->d_func()->uncompressedBytesAvailable(*this);
    else
        return -1;
}

qint64 QHttpNetworkReply::bytesAvailableNextBlock() const
{
    Q_D(const QHttpNetworkReply);
    if (d->connection)
        return d->connection->d_func()->uncompressedBytesAvailableNextBlock(*this);
    else
        return -1;
}

QByteArray QHttpNetworkReply::readAny()
{
    Q_D(QHttpNetworkReply);
    return d->responseData.read();
}

bool QHttpNetworkReply::isFinished() const
{
    return d_func()->state == QHttpNetworkReplyPrivate::AllDoneState;
}

bool QHttpNetworkReply::isPipeliningUsed() const
{
    return d_func()->pipeliningUsed;
}


QHttpNetworkReplyPrivate::QHttpNetworkReplyPrivate(const QUrl &newUrl)
    : QHttpNetworkHeaderPrivate(newUrl), state(NothingDoneState), statusCode(100),
      majorVersion(0), minorVersion(0), bodyLength(0), contentRead(0), totalProgress(0),
      chunkedTransferEncoding(false),
      connectionCloseEnabled(true),
      forceConnectionCloseEnabled(false),
      currentChunkSize(0), currentChunkRead(0), connection(0), initInflate(false),
      autoDecompress(false), responseData(), requestIsPrepared(false)
      ,pipeliningUsed(false)
{
}

QHttpNetworkReplyPrivate::~QHttpNetworkReplyPrivate()
{
}

void QHttpNetworkReplyPrivate::clear()
{
    state = NothingDoneState;
    statusCode = 100;
    bodyLength = 0;
    contentRead = 0;
    totalProgress = 0;
    currentChunkSize = 0;
    currentChunkRead = 0;
    connectionCloseEnabled = true;
    connection = 0;
#ifndef QT_NO_COMPRESS
    if (initInflate)
        inflateEnd(&inflateStrm);
#endif
    initInflate = false;
    streamEnd = false;
    autoDecompress = false;
    fields.clear();
}

// QHttpNetworkReplyPrivate
qint64 QHttpNetworkReplyPrivate::bytesAvailable() const
{
    return (state != ReadingDataState ? 0 : fragment.size());
}

bool QHttpNetworkReplyPrivate::isGzipped()
{
    QByteArray encoding = headerField("content-encoding");
    return encoding.toLower() == "gzip";
}

void QHttpNetworkReplyPrivate::removeAutoDecompressHeader()
{
    // The header "Content-Encoding  = gzip" is retained.
    // Content-Length is removed since the actual one send by the server is for compressed data
    QByteArray name("content-length");
    QByteArray lowerName = name.toLower();
    QList<QPair<QByteArray, QByteArray> >::Iterator it = fields.begin(),
                                                   end = fields.end();
    while (it != end) {
        if (name == it->first.toLower()) {
            fields.erase(it);
            break;
        }
        ++it;
    }

}

bool QHttpNetworkReplyPrivate::findChallenge(bool forProxy, QByteArray &challenge) const
{
    challenge.clear();
    // find out the type of authentication protocol requested.
    QByteArray header = forProxy ? "proxy-authenticate" : "www-authenticate";
    // pick the best protocol (has to match parsing in QAuthenticatorPrivate)
    QList<QByteArray> challenges = headerFieldValues(header);
    for (int i = 0; i<challenges.size(); i++) {
        QByteArray line = challenges.at(i);
        if (!line.toLower().startsWith("negotiate"))
            challenge = line;
    }
    return !challenge.isEmpty();
}

QAuthenticatorPrivate::Method QHttpNetworkReplyPrivate::authenticationMethod(bool isProxy) const
{
    // The logic is same as the one used in void QAuthenticatorPrivate::parseHttpResponse()
    QAuthenticatorPrivate::Method method = QAuthenticatorPrivate::None;
    QByteArray header = isProxy ? "proxy-authenticate" : "www-authenticate";
    QList<QByteArray> challenges = headerFieldValues(header);
    for (int i = 0; i<challenges.size(); i++) {
        QByteArray line = challenges.at(i).trimmed().toLower();
        if (method < QAuthenticatorPrivate::Basic
            && line.startsWith("basic")) {
            method = QAuthenticatorPrivate::Basic;
        } else if (method < QAuthenticatorPrivate::Ntlm
            && line.startsWith("ntlm")) {
            method = QAuthenticatorPrivate::Ntlm;
        } else if (method < QAuthenticatorPrivate::DigestMd5
            && line.startsWith("digest")) {
            method = QAuthenticatorPrivate::DigestMd5;
        }
    }
    return method;
}

#ifndef QT_NO_COMPRESS
bool QHttpNetworkReplyPrivate::gzipCheckHeader(QByteArray &content, int &pos)
{
    int method = 0; // method byte
    int flags = 0;  // flags byte
    bool ret = false;

    // Assure two bytes in the buffer so we can peek ahead -- handle case
    // where first byte of header is at the end of the buffer after the last
    // gzip segment
    pos = -1;
    QByteArray &body = content;
    int maxPos = body.size()-1;
    if (maxPos < 1) {
        return ret;
    }

    // Peek ahead to check the gzip magic header
    if (body[0] != char(gz_magic[0]) ||
        body[1] != char(gz_magic[1])) {
        return ret;
    }
    pos += 2;
    // Check the rest of the gzip header
    if (++pos <= maxPos)
        method = body[pos];
    if (pos++ <= maxPos)
        flags = body[pos];
    if (method != Z_DEFLATED || (flags & RESERVED) != 0) {
        return ret;
    }

    // Discard time, xflags and OS code:
    pos += 6;
    if (pos > maxPos)
        return ret;
    if ((flags & EXTRA_FIELD) && ((pos+2) <= maxPos)) { // skip the extra field
        unsigned len =  (unsigned)body[++pos];
        len += ((unsigned)body[++pos])<<8;
        pos += len;
        if (pos > maxPos)
            return ret;
    }
    if ((flags & ORIG_NAME) != 0) { // skip the original file name
        while(++pos <= maxPos && body[pos]) {}
    }
    if ((flags & COMMENT) != 0) {   // skip the .gz file comment
        while(++pos <= maxPos && body[pos]) {}
    }
    if ((flags & HEAD_CRC) != 0) {  // skip the header crc
        pos += 2;
        if (pos > maxPos)
            return ret;
    }
    ret = (pos < maxPos); // return failed, if no more bytes left
    return ret;
}

int QHttpNetworkReplyPrivate::gunzipBodyPartially(QByteArray &compressed, QByteArray &inflated)
{
    int ret = Z_DATA_ERROR;
    unsigned have;
    unsigned char out[CHUNK];
    int pos = -1;

    if (!initInflate) {
        // check the header
        if (!gzipCheckHeader(compressed, pos))
            return ret;
        // allocate inflate state
        inflateStrm.zalloc = Z_NULL;
        inflateStrm.zfree = Z_NULL;
        inflateStrm.opaque = Z_NULL;
        inflateStrm.avail_in = 0;
        inflateStrm.next_in = Z_NULL;
        ret = inflateInit2(&inflateStrm, -MAX_WBITS);
        if (ret != Z_OK)
            return ret;
        initInflate = true;
        streamEnd = false;
    }

    //remove the header.
    compressed.remove(0, pos+1);
    // expand until deflate stream ends
    inflateStrm.next_in = (unsigned char *)compressed.data();
    inflateStrm.avail_in = compressed.size();
    do {
        inflateStrm.avail_out = sizeof(out);
        inflateStrm.next_out = out;
        ret = inflate(&inflateStrm, Z_NO_FLUSH);
        switch (ret) {
        case Z_NEED_DICT:
            ret = Z_DATA_ERROR;
            // and fall through
        case Z_DATA_ERROR:
        case Z_MEM_ERROR:
            inflateEnd(&inflateStrm);
            initInflate = false;
            return ret;
        }
        have = sizeof(out) - inflateStrm.avail_out;
        inflated.append(QByteArray((const char *)out, have));
     } while (inflateStrm.avail_out == 0);
    // clean up and return
    if (ret <= Z_ERRNO || ret == Z_STREAM_END) {
        inflateEnd(&inflateStrm);
        initInflate = false;
    }
    streamEnd = (ret == Z_STREAM_END);
    return ret;
}
#endif

qint64 QHttpNetworkReplyPrivate::readStatus(QAbstractSocket *socket)
{
    qint64 bytes = 0;
    char c;

    while (socket->bytesAvailable()) {
        // allow both CRLF & LF (only) line endings
        if (socket->peek(&c, 1) == 1 && c == '\n') {
            bytes += socket->read(&c, 1); // read the "n"
            // remove the CR at the end
            if (fragment.endsWith('\r')) {
                fragment.truncate(fragment.length()-1);
            }
            bool ok = parseStatus(fragment);
            state = ReadingHeaderState;
            fragment.clear();
            if (!ok) {
                return -1;
            }
            break;
        } else {
            c = 0;
            int haveRead = socket->read(&c, 1);
            if (haveRead == -1)
                return -1;
            bytes += haveRead;
            fragment.append(c);
        }

        // is this a valid reply?
        if (fragment.length() >= 5 && !fragment.startsWith("HTTP/"))
        {
            fragment.clear();
            return -1;
        }

    }

    return bytes;
}

bool QHttpNetworkReplyPrivate::parseStatus(const QByteArray &status)
{
    // from RFC 2616:
    //        Status-Line = HTTP-Version SP Status-Code SP Reason-Phrase CRLF
    //        HTTP-Version   = "HTTP" "/" 1*DIGIT "." 1*DIGIT
    // that makes: 'HTTP/n.n xxx Message'
    // byte count:  0123456789012

    static const int minLength = 11;
    static const int dotPos = 6;
    static const int spacePos = 8;
    static const char httpMagic[] = "HTTP/";

    if (status.length() < minLength
        || !status.startsWith(httpMagic)
        || status.at(dotPos) != '.'
        || status.at(spacePos) != ' ') {
        // I don't know how to parse this status line
        return false;
    }

    // optimize for the valid case: defer checking until the end
    majorVersion = status.at(dotPos - 1) - '0';
    minorVersion = status.at(dotPos + 1) - '0';

    int i = spacePos;
    int j = status.indexOf(' ', i + 1); // j == -1 || at(j) == ' ' so j+1 == 0 && j+1 <= length()
    const QByteArray code = status.mid(i + 1, j - i - 1);

    bool ok;
    statusCode = code.toInt(&ok);
    reasonPhrase = QString::fromLatin1(status.constData() + j + 1);

    return ok && uint(majorVersion) <= 9 && uint(minorVersion) <= 9;
}

qint64 QHttpNetworkReplyPrivate::readHeader(QAbstractSocket *socket)
{
    qint64 bytes = 0;
    char c = 0;
    bool allHeaders = false;
    while (!allHeaders && socket->bytesAvailable()) {
        if (socket->peek(&c, 1) == 1 && c == '\n') {
            // check for possible header endings. As per HTTP rfc,
            // the header endings will be marked by CRLFCRLF. But
            // we will allow CRLFLF, LFLF & CRLFCRLF
            if (fragment.endsWith("\n\r") || fragment.endsWith('\n'))
                allHeaders = true;
        }
        bytes += socket->read(&c, 1);
        fragment.append(c);
    }
    // we received all headers now parse them
    if (allHeaders) {
        parseHeader(fragment);
        state = ReadingDataState;
        fragment.clear(); // next fragment
        bodyLength = contentLength(); // cache the length

        // cache isChunked() since it is called often
        chunkedTransferEncoding = headerField("transfer-encoding").toLower().contains("chunked");

        // cache isConnectionCloseEnabled since it is called often
        QByteArray connectionHeaderField = headerField("connection");
        // check for explicit indication of close or the implicit connection close of HTTP/1.0
        connectionCloseEnabled = (connectionHeaderField.toLower().contains("close") ||
            headerField("proxy-connection").toLower().contains("close")) ||
            (majorVersion == 1 && minorVersion == 0 && connectionHeaderField.isEmpty());
    }
    return bytes;
}

void QHttpNetworkReplyPrivate::parseHeader(const QByteArray &header)
{
    // see rfc2616, sec 4 for information about HTTP/1.1 headers.
    // allows relaxed parsing here, accepts both CRLF & LF line endings
    const QByteArrayMatcher lf("\n");
    const QByteArrayMatcher colon(":");
    int i = 0;
    while (i < header.count()) {
        int j = colon.indexIn(header, i); // field-name
        if (j == -1)
            break;
        const QByteArray field = header.mid(i, j - i).trimmed();
        j++;
        // any number of LWS is allowed before and after the value
        QByteArray value;
        do {
            i = lf.indexIn(header, j);
            if (i == -1)
                break;
            if (!value.isEmpty())
                value += ' ';
            // check if we have CRLF or only LF
            bool hasCR = (i && header[i-1] == '\r');
            int length = i -(hasCR ? 1: 0) - j;
            value += header.mid(j, length).trimmed();
            j = ++i;
        } while (i < header.count() && (header.at(i) == ' ' || header.at(i) == '\t'));
        if (i == -1)
            break; // something is wrong

        fields.append(qMakePair(field, value));
    }
}

bool QHttpNetworkReplyPrivate::isChunked()
{
    return chunkedTransferEncoding;
}

bool QHttpNetworkReplyPrivate::isConnectionCloseEnabled()
{
    return connectionCloseEnabled || forceConnectionCloseEnabled;
}

// note this function can only be used for non-chunked, non-compressed with
// known content length
qint64 QHttpNetworkReplyPrivate::readBodyFast(QAbstractSocket *socket, QByteDataBuffer *rb)
{
    qint64 toBeRead = qMin(socket->bytesAvailable(), bodyLength - contentRead);
    QByteArray bd;
    bd.resize(toBeRead);
    qint64 haveRead = socket->read(bd.data(), bd.size());
    if (haveRead == -1) {
        bd.clear();
        return 0; // ### error checking here;
    }
    bd.resize(haveRead);

    rb->append(bd);

    if (contentRead + haveRead == bodyLength) {
        state = AllDoneState;
    }

    contentRead += haveRead;
    return haveRead;
}


qint64 QHttpNetworkReplyPrivate::readBody(QAbstractSocket *socket, QByteDataBuffer *out)
{
    qint64 bytes = 0;
    if (isChunked()) {
        bytes += readReplyBodyChunked(socket, out); // chunked transfer encoding (rfc 2616, sec 3.6)
    } else if (bodyLength > 0) { // we have a Content-Length
        bytes += readReplyBodyRaw(socket, out, bodyLength - contentRead);
        if (contentRead + bytes == bodyLength)
            state = AllDoneState;
    } else {
        bytes += readReplyBodyRaw(socket, out, socket->bytesAvailable());
    }
    contentRead += bytes;
    return bytes;
}

qint64 QHttpNetworkReplyPrivate::readReplyBodyRaw(QIODevice *in, QByteDataBuffer *out, qint64 size)
{
    qint64 bytes = 0;
    Q_ASSERT(in);
    Q_ASSERT(out);

    int toBeRead = qMin<qint64>(128*1024, qMin<qint64>(size, in->bytesAvailable()));
    while (toBeRead > 0) {
        QByteArray byteData;
        byteData.resize(toBeRead);
        qint64 haveRead = in->read(byteData.data(), byteData.size());
        if (haveRead <= 0) {
            // ### error checking here
            byteData.clear();
            return bytes;
        }

        byteData.resize(haveRead);
        out->append(byteData);
        bytes += haveRead;
        size -= haveRead;

        toBeRead = qMin<qint64>(128*1024, qMin<qint64>(size, in->bytesAvailable()));
    }
    return bytes;

}

qint64 QHttpNetworkReplyPrivate::readReplyBodyChunked(QIODevice *in, QByteDataBuffer *out)
{
    qint64 bytes = 0;
    while (in->bytesAvailable()) { // while we can read from input
        // if we are done with the current chunk, get the size of the new chunk
        if (currentChunkRead >= currentChunkSize) {
            currentChunkSize = 0;
            currentChunkRead = 0;
            if (bytes) {
                char crlf[2];
                bytes += in->read(crlf, 2); // read the "\r\n" after the chunk
            }
            bytes += getChunkSize(in, &currentChunkSize);
            if (currentChunkSize == -1)
                break;
        }
        // if the chunk size is 0, end of the stream
        if (currentChunkSize == 0) {
            state = AllDoneState;
            break;
        }

        // otherwise, try to read what is missing for this chunk
        qint64 haveRead = readReplyBodyRaw (in, out, currentChunkSize - currentChunkRead);
        currentChunkRead += haveRead;
        bytes += haveRead;

        // ### error checking here

    }
    return bytes;
}

qint64 QHttpNetworkReplyPrivate::getChunkSize(QIODevice *in, qint64 *chunkSize)
{
    qint64 bytes = 0;
    char crlf[2];
    *chunkSize = -1;
    int bytesAvailable = in->bytesAvailable();
    while (bytesAvailable > bytes) {
        qint64 sniffedBytes =  in->peek(crlf, 2);
        int fragmentSize = fragment.size();
        // check the next two bytes for a "\r\n", skip blank lines
        if ((fragmentSize && sniffedBytes == 2 && crlf[0] == '\r' && crlf[1] == '\n')
           ||(fragmentSize > 1 && fragment.endsWith('\r')  && crlf[0] == '\n'))
        {
            bytes += in->read(crlf, 1);     // read the \r or \n
            if (crlf[0] == '\r')
                bytes += in->read(crlf, 1); // read the \n
            bool ok = false;
            // ignore the chunk-extension
            fragment = fragment.mid(0, fragment.indexOf(';')).trimmed();
            *chunkSize = fragment.toLong(&ok, 16);
            fragment.clear();
            break; // size done
        } else {
            // read the fragment to the buffer
            char c = 0;
            bytes += in->read(&c, 1);
            fragment.append(c);
        }
    }
    return bytes;
}

void QHttpNetworkReplyPrivate::appendUncompressedReplyData(QByteArray &qba)
{
    responseData.append(qba);

    // clear the original! helps with implicit sharing and
    // avoiding memcpy when the user is reading the data
    qba.clear();
}

void QHttpNetworkReplyPrivate::appendUncompressedReplyData(QByteDataBuffer &data)
{
    responseData.append(data);

    // clear the original! helps with implicit sharing and
    // avoiding memcpy when the user is reading the data
    data.clear();
}

void QHttpNetworkReplyPrivate::appendCompressedReplyData(QByteDataBuffer &data)
{
    // Work in progress: Later we will directly use a list of QByteArray or a QRingBuffer
    // instead of one QByteArray.
    for(int i = 0; i < data.bufferCount(); i++) {
        QByteArray &byteData = data[i];
        compressedData.append(byteData.constData(), byteData.size());
    }
    data.clear();
}


bool QHttpNetworkReplyPrivate::shouldEmitSignals()
{
    // for 401 & 407 don't emit the data signals. Content along with these
    // responses are send only if the authentication fails.
    return (statusCode != 401 && statusCode != 407);
}

bool QHttpNetworkReplyPrivate::expectContent()
{
    // check whether we can expect content after the headers (rfc 2616, sec4.4)
    if ((statusCode >= 100 && statusCode < 200)
        || statusCode == 204 || statusCode == 304)
        return false;
    if (request.operation() == QHttpNetworkRequest::Head)
        return !shouldEmitSignals();
    if (contentLength() == 0)
        return false;
    return true;
}

void QHttpNetworkReplyPrivate::eraseData()
{
    compressedData.clear();
    responseData.clear();
}


// SSL support below
#ifndef QT_NO_OPENSSL

QSslConfiguration QHttpNetworkReply::sslConfiguration() const
{
    Q_D(const QHttpNetworkReply);
    if (d->connection)
        return d->connection->d_func()->sslConfiguration(*this);
    return QSslConfiguration();
}

void QHttpNetworkReply::setSslConfiguration(const QSslConfiguration &config)
{
    Q_D(QHttpNetworkReply);
    if (d->connection)
        d->connection->setSslConfiguration(config);
}

void QHttpNetworkReply::ignoreSslErrors()
{
    Q_D(QHttpNetworkReply);
    if (d->connection)
        d->connection->ignoreSslErrors();
}

void QHttpNetworkReply::ignoreSslErrors(const QList<QSslError> &errors)
{
    Q_D(QHttpNetworkReply);
    if (d->connection)
        d->connection->ignoreSslErrors(errors);
}


#endif //QT_NO_OPENSSL


QT_END_NAMESPACE

#endif // QT_NO_HTTP
