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#include "qnetworkproxy.h"

#ifndef QT_NO_NETWORKPROXY

#include <qmutex.h>

#include <qstringlist.h>

#include <qregexp.h>

#include <qurl.h>

#include <string.h>

#include <qt_windows.h>

#include <wininet.h>

/*

 * Information on the WinHTTP DLL:

 *  http://msdn.microsoft.com/en-us/library/aa384122(VS.85).aspx example for WPAD

 *

 *  http://msdn.microsoft.com/en-us/library/aa384097(VS.85).aspx WinHttpGetProxyForUrl

 *  http://msdn.microsoft.com/en-us/library/aa384096(VS.85).aspx WinHttpGetIEProxyConfigForCurrentUs

 *  http://msdn.microsoft.com/en-us/library/aa384095(VS.85).aspx WinHttpGetDefaultProxyConfiguration

 */

// We don't want to include winhttp.h because that's not

// present in some Windows SDKs (I don't know why)

// So, instead, copy the definitions here

typedef struct {

  DWORD dwFlags;

  DWORD dwAutoDetectFlags;

  LPCWSTR lpszAutoConfigUrl;

  LPVOID lpvReserved;

  DWORD dwReserved;

  BOOL fAutoLogonIfChallenged;

} WINHTTP_AUTOPROXY_OPTIONS;

typedef struct {

  DWORD dwAccessType;

  LPWSTR lpszProxy;

  LPWSTR lpszProxyBypass;

} WINHTTP_PROXY_INFO;

typedef struct {

  BOOL fAutoDetect;

  LPWSTR lpszAutoConfigUrl;

  LPWSTR lpszProxy;

  LPWSTR lpszProxyBypass;

} WINHTTP_CURRENT_USER_IE_PROXY_CONFIG;

#define WINHTTP_AUTOPROXY_AUTO_DETECT           0x00000001

#define WINHTTP_AUTOPROXY_CONFIG_URL            0x00000002

#define WINHTTP_AUTO_DETECT_TYPE_DHCP           0x00000001

#define WINHTTP_AUTO_DETECT_TYPE_DNS_A          0x00000002

#define WINHTTP_ACCESS_TYPE_DEFAULT_PROXY               0

#define WINHTTP_ACCESS_TYPE_NO_PROXY                    1

#define WINHTTP_ACCESS_TYPE_NAMED_PROXY                 3

#define WINHTTP_NO_PROXY_NAME     NULL

#define WINHTTP_NO_PROXY_BYPASS   NULL

QT_BEGIN_NAMESPACE

typedef BOOL (WINAPI * PtrWinHttpGetProxyForUrl)(HINTERNET, LPCWSTR, WINHTTP_AUTOPROXY_OPTIONS*, WINHTTP_PROXY_INFO*);

typedef HINTERNET (WINAPI * PtrWinHttpOpen)(LPCWSTR, DWORD, LPCWSTR, LPCWSTR,DWORD);

typedef BOOL (WINAPI * PtrWinHttpGetDefaultProxyConfiguration)(WINHTTP_PROXY_INFO*);

typedef BOOL (WINAPI * PtrWinHttpGetIEProxyConfigForCurrentUser)(WINHTTP_CURRENT_USER_IE_PROXY_CONFIG*);

typedef BOOL (WINAPI * PtrWinHttpCloseHandle)(HINTERNET);

static PtrWinHttpGetProxyForUrl ptrWinHttpGetProxyForUrl = 0;

static PtrWinHttpOpen ptrWinHttpOpen = 0;

static PtrWinHttpGetDefaultProxyConfiguration ptrWinHttpGetDefaultProxyConfiguration = 0;

static PtrWinHttpGetIEProxyConfigForCurrentUser ptrWinHttpGetIEProxyConfigForCurrentUser = 0;

static PtrWinHttpCloseHandle ptrWinHttpCloseHandle = 0;

static QStringList splitSpaceSemicolon(const QString &source)

{

    QStringList list;

    int start = 0;

    int end;

    while (true) {

        int space = source.indexOf(QLatin1Char(' '), start);

        int semicolon = source.indexOf(QLatin1Char(';'), start);

        end = space;

        if (semicolon != -1 && (end == -1 || semicolon < end))

            end = semicolon;

        if (end == -1) {

            if (start != source.length())

                list.append(source.mid(start));

            return list;

        }

        if (start != end)

            list.append(source.mid(start, end - start));

        start = end + 1;

    }

    return list;

}

static bool isBypassed(const QString &host, const QStringList &bypassList)

{

    if (host.isEmpty())

        return true;

    bool isSimple = !host.contains(QLatin1Char('.')) && !host.contains(QLatin1Char(':'));

    QHostAddress ipAddress;

    bool isIpAddress = ipAddress.setAddress(host);

    // does it match the list of exclusions?

    foreach (const QString &entry, bypassList) {

        if (isSimple && entry == QLatin1String("<local>"))

            return true;

        if (isIpAddress && ipAddress.isInSubnet(QHostAddress::parseSubnet(entry))) {

            return true;        // excluded

        } else {

            // do wildcard matching

            QRegExp rx(entry, Qt::CaseInsensitive, QRegExp::Wildcard);

            if (rx.exactMatch(host))

                return true;

        }

    }

    // host was not excluded

    return false;

}

static QList<QNetworkProxy> parseServerList(const QNetworkProxyQuery &query, const QStringList &proxyList)

{

    // Reference documentation from Microsoft:

    // http://msdn.microsoft.com/en-us/library/aa383912(VS.85).aspx

    //

    // According to the website, the proxy server list is

    // one or more of the space- or semicolon-separated strings in the format:

    //   ([<scheme>=][<scheme>"://"]<server>[":"<port>])

    QList<QNetworkProxy> result;

    foreach (const QString &entry, proxyList) {

        int server = 0;

        int pos = entry.indexOf(QLatin1Char('='));

        if (pos != -1) {

            QStringRef scheme = entry.leftRef(pos);

            if (scheme != query.protocolTag())

                continue;

            server = pos + 1;

        }

        QNetworkProxy::ProxyType proxyType = QNetworkProxy::HttpProxy;

        quint16 port = 8080;

        pos = entry.indexOf(QLatin1String("://"), server);

        if (pos != -1) {

            QStringRef scheme = entry.midRef(server, pos - server);

            if (scheme == QLatin1String("http") || scheme == QLatin1String("https")) {

                // no-op

                // defaults are above

            } else if (scheme == QLatin1String("socks") || scheme == QLatin1String("socks5")) {

                proxyType = QNetworkProxy::Socks5Proxy;

                port = 1080;

            } else {

                // unknown proxy type

                continue;

            }

            server = pos + 3;

        }

        pos = entry.indexOf(QLatin1Char(':'), server);

        if (pos != -1) {

            bool ok;

            uint value = entry.mid(pos + 1).toUInt(&ok);

            if (!ok || value > 65535)

                continue;       // invalid port number

            port = value;

        } else {

            pos = entry.length();

        }

        result << QNetworkProxy(proxyType, entry.mid(server, pos - server), port);

    }

    return result;

}

class QWindowsSystemProxy

{

public:

    QWindowsSystemProxy();

    ~QWindowsSystemProxy();

    void init();

    QMutex mutex;

    HINTERNET hHttpSession;

    WINHTTP_AUTOPROXY_OPTIONS autoProxyOptions;

    QString autoConfigUrl;

    QStringList proxyServerList;

    QStringList proxyBypass;

    QList<QNetworkProxy> defaultResult;

    bool initialized;

    bool functional;

    bool isAutoConfig;

};

Q_GLOBAL_STATIC(QWindowsSystemProxy, systemProxy)

QWindowsSystemProxy::QWindowsSystemProxy()

    : initialized(false), functional(false), isAutoConfig(false)

{

    defaultResult << QNetworkProxy::NoProxy;

}

QWindowsSystemProxy::~QWindowsSystemProxy()

{

    if (hHttpSession)

        ptrWinHttpCloseHandle(hHttpSession);

}

void QWindowsSystemProxy::init()

{

    if (initialized)

        return;

    initialized = true;

#ifdef Q_OS_WINCE

    // Windows CE does not have any of the following API

    return;

#else

    // load the winhttp.dll library

    HINSTANCE winhttpHnd = LoadLibrary(L"winhttp");

    if (!winhttpHnd)

        return;                 // failed to load

    ptrWinHttpOpen = (PtrWinHttpOpen)GetProcAddress(winhttpHnd, "WinHttpOpen");

    ptrWinHttpCloseHandle = (PtrWinHttpCloseHandle)GetProcAddress(winhttpHnd, "WinHttpCloseHandle");

    ptrWinHttpGetProxyForUrl = (PtrWinHttpGetProxyForUrl)GetProcAddress(winhttpHnd, "WinHttpGetProxyForUrl");

    ptrWinHttpGetDefaultProxyConfiguration = (PtrWinHttpGetDefaultProxyConfiguration)GetProcAddress(winhttpHnd, "WinHttpGetDefaultProxyConfiguration");

    ptrWinHttpGetIEProxyConfigForCurrentUser = (PtrWinHttpGetIEProxyConfigForCurrentUser)GetProcAddress(winhttpHnd, "WinHttpGetIEProxyConfigForCurrentUser");

    // Try to obtain the Internet Explorer configuration.

    WINHTTP_CURRENT_USER_IE_PROXY_CONFIG ieProxyConfig;

    if (ptrWinHttpGetIEProxyConfigForCurrentUser(&ieProxyConfig)) {

        if (ieProxyConfig.lpszAutoConfigUrl) {

            autoConfigUrl = QString::fromWCharArray(ieProxyConfig.lpszAutoConfigUrl);

            GlobalFree(ieProxyConfig.lpszAutoConfigUrl);

        }

        if (ieProxyConfig.lpszProxy) {

            // http://msdn.microsoft.com/en-us/library/aa384250%28VS.85%29.aspx speaks only about a "proxy URL",

            // not multiple URLs. However we tested this and it can return multiple URLs. So we use splitSpaceSemicolon

            // on it.

            proxyServerList = splitSpaceSemicolon(QString::fromWCharArray(ieProxyConfig.lpszProxy));

            GlobalFree(ieProxyConfig.lpszProxy);

        }

        if (ieProxyConfig.lpszProxyBypass) {

            proxyBypass = splitSpaceSemicolon(QString::fromWCharArray(ieProxyConfig.lpszProxyBypass));

            GlobalFree(ieProxyConfig.lpszProxyBypass);

        }

    }

    hHttpSession = NULL;

    if (ieProxyConfig.fAutoDetect || !autoConfigUrl.isEmpty()) {

        // using proxy autoconfiguration

        proxyServerList.clear();

        proxyBypass.clear();

        // open the handle and obtain the options

        hHttpSession = ptrWinHttpOpen(L"Qt System Proxy access/1.0",

                                      WINHTTP_ACCESS_TYPE_NO_PROXY,

                                      WINHTTP_NO_PROXY_NAME,

                                      WINHTTP_NO_PROXY_BYPASS,

                                      0);

        if (!hHttpSession)

            return;

        isAutoConfig = true;

        memset(&autoProxyOptions, 0, sizeof autoProxyOptions);

        autoProxyOptions.fAutoLogonIfChallenged = true;

        if (ieProxyConfig.fAutoDetect) {

            autoProxyOptions.dwFlags = WINHTTP_AUTOPROXY_AUTO_DETECT;

            autoProxyOptions.dwAutoDetectFlags = WINHTTP_AUTO_DETECT_TYPE_DHCP |

                                                 WINHTTP_AUTO_DETECT_TYPE_DNS_A;

        } else {

            autoProxyOptions.dwFlags = WINHTTP_AUTOPROXY_CONFIG_URL;

            autoProxyOptions.lpszAutoConfigUrl = (LPCWSTR)autoConfigUrl.utf16();

        }

    } else {

        // not auto-detected

        // attempt to get the static configuration instead

        WINHTTP_PROXY_INFO proxyInfo;

        if (ptrWinHttpGetDefaultProxyConfiguration(&proxyInfo) &&

            proxyInfo.dwAccessType == WINHTTP_ACCESS_TYPE_NAMED_PROXY) {

            // we got information from the registry

            // overwrite the IE configuration, if any

            proxyBypass = splitSpaceSemicolon(QString::fromWCharArray(proxyInfo.lpszProxyBypass));

            proxyServerList = splitSpaceSemicolon(QString::fromWCharArray(proxyInfo.lpszProxy));

        }

        if (proxyInfo.lpszProxy)

            GlobalFree(proxyInfo.lpszProxy);

        if (proxyInfo.lpszProxyBypass)

            GlobalFree(proxyInfo.lpszProxyBypass);

    }

    functional = isAutoConfig || !proxyServerList.isEmpty();

#endif

}

QList<QNetworkProxy> QNetworkProxyFactory::systemProxyForQuery(const QNetworkProxyQuery &query)

{

    QWindowsSystemProxy *sp = systemProxy();

    if (!sp)

        return QList<QNetworkProxy>() << QNetworkProxy();

    QMutexLocker locker(&sp->mutex);

    sp->init();

    if (!sp->functional)

        return sp->defaultResult;

    if (sp->isAutoConfig) {

        WINHTTP_PROXY_INFO proxyInfo;

        // try to get the proxy config for the URL

        QUrl url = query.url();

        // url could be empty, e.g. from QNetworkProxy::applicationProxy(), that's fine,

        // we'll still ask for the proxy.

        // But for a file url, we know we don't need one.

        if (url.scheme() == QLatin1String("file") || url.scheme() == QLatin1String("qrc"))

            return sp->defaultResult;

        if (query.queryType() != QNetworkProxyQuery::UrlRequest) {

            // change the scheme to https, maybe it'll work

            url.setScheme(QLatin1String("https"));

        }

        if (ptrWinHttpGetProxyForUrl(sp->hHttpSession,

                                     (LPCWSTR)url.toString().utf16(),

                                     &sp->autoProxyOptions,

                                     &proxyInfo)) {

            // yes, we got a config for this URL

            QString proxyBypass = QString::fromWCharArray(proxyInfo.lpszProxyBypass);

            QStringList proxyServerList = splitSpaceSemicolon(QString::fromWCharArray(proxyInfo.lpszProxy));

            if (proxyInfo.lpszProxy)

                GlobalFree(proxyInfo.lpszProxy);

            if (proxyInfo.lpszProxyBypass)

                GlobalFree(proxyInfo.lpszProxyBypass);

            if (isBypassed(query.peerHostName(), splitSpaceSemicolon(proxyBypass)))

                return sp->defaultResult;

            return parseServerList(query, proxyServerList);

        }

        // GetProxyForUrl failed

        return sp->defaultResult;

    }

    // static configuration

    if (isBypassed(query.peerHostName(), sp->proxyBypass))

        return sp->defaultResult;

    QList<QNetworkProxy> result = parseServerList(query, sp->proxyServerList);

    // In some cases, this was empty. See SF task 00062670

    if (result.isEmpty())

        return sp->defaultResult;

    return result;

}

QT_END_NAMESPACE

#endif