// Copyright (C) 2001-2005 Open Source Telecom Corporation.
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//
// As a special exception, you may use this file as part of a free software
// library without restriction.  Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License.  This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.
//
// This exception applies only to the code released under the name GNU
// Common C++.  If you copy code from other releases into a copy of GNU
// Common C++, as the General Public License permits, the exception does
// not apply to the code that you add in this way.  To avoid misleading
// anyone as to the status of such modified files, you must delete
// this exception notice from them.
//
// If you write modifications of your own for GNU Common C++, it is your choice
// whether to permit this exception to apply to your modifications.
// If you do not wish that, delete this exception notice.
//

#include <cc++/config.h>
#ifdef	CCXX_WITHOUT_EXTRAS
#include <cc++/export.h>
#endif
#include <cc++/file.h>
#include <cc++/thread.h>
#include <cc++/exception.h>
#include <cc++/address.h>
#include <cc++/socket.h>
#ifndef	CCXX_WITHOUT_EXTRAS
#include <cc++/export.h>
#endif
#include <cc++/url.h>

#include <string>
#include <cstdio>
#include <cstdlib>
#include <fcntl.h>
#include <cerrno>
#include <iostream>

#ifdef	WIN32
#include <io.h>
#endif

#ifdef HAVE_SSTREAM
#include <sstream>
#else
#include <strstream>
#endif

#include <cctype>

#ifndef WIN32
// cause problem on Solaris
#if !defined(__sun) && !defined(__SUN__)
#ifdef	HAVE_NET_IF_H
#include <net/if.h>
#endif
#endif
#include <sys/ioctl.h>
#endif

#ifdef	CCXX_NAMESPACES
namespace ost {
using namespace std;
#endif

URLStream::URLStream(Family fam, timeout_t to) :
TCPStream(fam)
{
	persistent = false;
	proxyPort = 0;
	timeout = to;
	protocol = protocolHttp1_0;
	follow = true;
	proxyAuth = authAnonymous;
	encoding = encodingBinary;
 	proxyUser = proxyPasswd = NULL;
	auth = authAnonymous;
	cookie = agent = pragma = referer = user = password = NULL;
	localif = NULL;
	setError(false);
}

int URLStream::aRead(char *buffer, size_t len, timeout_t timer)
{
	return readData(buffer, len, 0, timer);
}

int URLStream::aWrite(char *buffer, size_t len, timeout_t timer)
{
	return writeData(buffer, len, timer);
}

void URLStream::httpHeader(const char *header, const char *value)
{
}

char **URLStream::extraHeader(void)
{
	return NULL;
}

int URLStream::underflow(void)
{
	ssize_t len = 0, rlen;
	char *buf;

	if(bufsize == 1)
		return TCPStream::underflow();

	if(!gptr())
		return EOF;

	if(gptr() < egptr())
		return (unsigned char)*gptr();

	rlen = (ssize_t)((gbuf + bufsize) - eback());
	if(encoding == encodingChunked) {
		buf = (char *)eback();
		*buf = '\n';
		while(!chunk && (*buf == '\n' || *buf == '\r')) {
			*buf = 0;
			len = readLine(buf, rlen, timeout);
		}
		if(len) {
			if(!chunk)
				chunk = strtol(buf, NULL, 16);

			if(rlen > (int)chunk)
				rlen = chunk;
		}
		else
			rlen = -1;
	}

	if(rlen > 0) {
		if(Socket::state == STREAM)
			rlen = aRead((char *)eback(), rlen, timeout);
		else if(timeout) {
			if(Socket::isPending(pendingInput, timeout))
				rlen = readData(eback(), rlen);
			else
				rlen = -1;
		}
		else
			rlen = readData(eback(), rlen);
	}
	if(encoding == encodingChunked && rlen > 0)
		chunk -= rlen;

	if(rlen < 1) {
		if(rlen < 0)
			clear(ios::failbit | rdstate());
		return EOF;
	}
	setg(eback(), eback(), eback() + rlen);
	return (unsigned char)*gptr();
}

void URLStream::setProxy(const char *host, tpport_t port)
{
	switch(family) {
#ifdef	CCXX_IPV6
	case IPV6:
		v6proxyHost = host;
		break;
#endif
	case IPV4:
		proxyHost = host;
		break;
	default:
		proxyPort = 0;
		return;
	}
	proxyPort = port;
}

URLStream::Error URLStream::submit(const char *path, const char **vars, size_t buf)
{
	Error status = errInvalid, saved;

	if(!strnicmp(path, "http:", 5)) {
		urlmethod = methodHttpGet;
		path = strchr(path + 5, '/');
		status = sendHTTPHeader(path, vars, buf);
	}
	if((status == errInvalid || status == errTimeout)) {
		if(Socket::state != AVAILABLE)
			close();
		return status;
	}
	else {
		saved = status;
		status = getHTTPHeaders();
		if(status == errSuccess)
			return saved;
		else if(status == errTimeout) {
			if(Socket::state != AVAILABLE)
				close();
		}
		return status;
	}
}

URLStream::Error URLStream::post(const char *path, MIMEMultipartForm &form, size_t buf)
{
	Error status = errInvalid, saved;
	if(!strnicmp(path, "http:", 5)) {
		urlmethod = methodHttpPostMultipart;
		path = strchr(path + 5, '/');
		status = sendHTTPHeader(path, (const char **)form.getHeaders(), buf);
	}

	if(status == errInvalid || status == errTimeout) {
		if(Socket::state != AVAILABLE)
			close();
		return status;
	}
	saved = status;
	status = getHTTPHeaders();
	if(status == errSuccess) {
		form.body(dynamic_cast<std::ostream *>(this));
		return saved;
	}
	if(status == errTimeout) {
		if(Socket::state != AVAILABLE)
			close();
	}
	return status;
}

URLStream::Error URLStream::post(const char *path, const char **vars, size_t buf)
{
	Error status = errInvalid, saved;

	if(!strnicmp(path, "http:", 5)) {
		urlmethod = methodHttpPost;
		path = strchr(path + 5, '/');
		status = sendHTTPHeader(path, vars, buf);
	}

	if((status == errInvalid || status == errTimeout)) {
		if(Socket::state != AVAILABLE)
			close();
		return status;
	}
	saved = status;
	status = getHTTPHeaders();
	if(status == errSuccess)
		return saved;
	if(status == errTimeout) {
		if(Socket::state != AVAILABLE)
			close();
	}
	return status;
}


URLStream::Error URLStream::head(const char *path, size_t buf)
{
	Error status = errInvalid, saved;

	if(!strnicmp(path, "http:", 5)) {
		urlmethod = methodHttpGet;
		path = strchr(path + 5, '/');
		status = sendHTTPHeader(path, NULL, buf);
	}

	if((status == errInvalid || status == errTimeout)) {
		if(Socket::state != AVAILABLE)
			close();
		return status;
	}
	else {
		saved = status;
		status = getHTTPHeaders();
		if(status == errSuccess)
			return saved;
		else if(status == errTimeout) {
			if(Socket::state != AVAILABLE)
				close();
		}
		return status;
	}
}

URLStream &URLStream::getline(char *buffer, size_t size)
{
	size_t len;

	*buffer = 0;
	// TODO: check, we mix use of streambuf with Socket::readLine...
	iostream::getline(buffer, (unsigned long)size);
	len = strlen(buffer);

	while(len) {
		if(buffer[len - 1] == '\r' || buffer[len - 1] == '\n')
			buffer[len - 1] = 0;
		else
			break;
		--len;
	}
	return *this;
}

URLStream::Error URLStream::get(size_t buffer)
{
	String path = String("http://") + m_host;

	if ( m_address.operator[](0) != '/' )
		path += "/";

	path += m_address;

	return get(path.c_str(), buffer);
}

URLStream::Error URLStream::get(const char *urlpath, size_t buf)
{
	const char *path = urlpath;
	Error status = errInvalid, saved;

	urlmethod = methodFileGet;

	if(Socket::state != AVAILABLE)
		close();


	if(!strnicmp(path, "file:", 5)) {
		urlmethod = methodFileGet;
		path += 5;
	}
	else if(!strnicmp(path, "http:", 5)) {
		urlmethod = methodHttpGet;
		path = strchr(path + 5, '/');
	}
	switch(urlmethod) {
	case methodHttpGet:
		status = sendHTTPHeader(path, NULL, buf);
		break;
	case methodFileGet:
		if(so != INVALID_SOCKET)
			::close((int)so);
		so = ::open(path, O_RDWR);
		if(so == INVALID_SOCKET)
			so = ::open(path, O_RDONLY);
		// FIXME: open return the same handle type as socket call ??
		if(so == INVALID_SOCKET)
			return errInvalid;
		Socket::state = STREAM;
		allocate(buf);
		return errSuccess;
	default:
		        break;
	}


	if((status == errInvalid || status == errTimeout)) {
		if(Socket::state != AVAILABLE)
			close();
		return status;
	}
	else {
		saved = status;
		status = getHTTPHeaders();
		if(status == errSuccess)
			return saved;
		else if(status == errTimeout) {
			if(Socket::state != AVAILABLE)
				close();
		}
		return status;
	}
}

URLStream::Error URLStream::getHTTPHeaders()
{
	char buffer[512];
	size_t buf = sizeof(buffer);
	Error status = errSuccess;
	char *cp, *ep;
	ssize_t len = 1;
	char nc = 0;

	chunk = ((unsigned)-1) / 2;
	encoding = encodingBinary;
	while(len > 0) {
		len = readLine(buffer, buf, timeout);
		if(len < 1)
			return errTimeout;

		// FIXME: for multiline syntax ??
		if(buffer[0] == ' ' || buffer[0] == '\r' || buffer[0] == '\n')
			break;
		cp = strchr(buffer, ':');
		if(!cp)
			continue;
		*(cp++) = 0;
		while(*cp == ' ' || *cp == '\t')
			++cp;
		ep = strchr(cp, '\n');
		if(!ep)
			ep = &nc;
		while(*ep == '\n' || *ep == '\r' || *ep == ' ') {
			*ep = 0;
			if((--ep) < cp)
				break;
		}
		if(!stricmp(buffer, "Transfer-Encoding")) {
			if(!stricmp(cp, "chunked")) {
				chunk = 0;
				encoding = encodingChunked;
			}
		}
		httpHeader(buffer, cp);
	}
	return status;
}


void URLStream::close(void)
{
	if(Socket::state == AVAILABLE)
		return;

	endStream();
	so = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
	if(so != INVALID_SOCKET)
		Socket::state = AVAILABLE;
}

URLStream::Error URLStream::sendHTTPHeader(const char *url, const char **vars, size_t buf)
{
	// TODO: implement authentication
	char reloc[4096];
	// "//" host ":" port == max 2 + 128 + 1 + 5 + 1(\0) = 137, rounded 140
	char host[140];
	// TODO: add support for //user:pass@host:port/ syntax
#ifdef HAVE_SSTREAM
	ostringstream str;
#else
	char buffer[4096];
	strstream str(buffer, sizeof(buffer), ios::out);
#endif
	char *ref, *cp, *ep;
	char *hp;
	const char *uri = "/";
	int count = 0;
	size_t len = 0;
	tpport_t port = 80;
	const char **args = vars;
	const char *var;
	bool lasteq = true;

	struct servent *svc;

retry:
#ifdef HAVE_SSTREAM
	str.str("");
#else
	buffer[0] = 0;
	str.seekp(0);
#endif

	setString(host, sizeof(host), url);
reformat:
	hp = strchr(host, '/');
	if(!hp) {
		host[0] = '/';
		setString(host + 1, sizeof(host) - 1, url);
		goto reformat;
	}
	while(*hp == '/')
		++hp;
	cp = strchr(hp, '/');
	if (cp) *cp = 0;
	ep = strrchr(hp, ':');
	if(ep) {
		*ep = 0;
		++ep;
		if(isdigit(*ep))
			port = atoi(ep);
		else {
			Socket::mutex.enter();
			svc = getservbyname(ep, "tcp");
			if(svc)
				port = ntohs(svc->s_port);
			Socket::mutex.leave();
		}
	}

	if(!proxyPort) {
		const char* ep1 = url;
		while(*ep1 == '/')
			++ep1;
		ep1 = strchr(ep1, '/');
		if(ep1)
	        	uri = ep1;
	}

	switch(urlmethod) {
	case methodHttpGet:
		str << "GET ";
		if(proxyPort) {
			str << "http:" << url;
			if(!cp) str << '/';
		}
		else
			str << uri;
		break;
	case methodHttpPost:
	case methodHttpPostMultipart:
		str << "POST ";
		if(proxyPort) {
			str << "http:" << url;
			if(!cp) str << '/';
		}
		else
			str << uri;
		break;
	default:
		return errInvalid;
	}

	if(vars && urlmethod == methodHttpGet) {
		str << "?";
		while(*vars) {
			if(count++ && lasteq)
				str << "&";
			str << *vars;
			if(!lasteq)
				lasteq = true;
			else if(strchr(*vars, '='))
				lasteq = true;
			else {
				lasteq = false;
				str << "=";
			}
			++vars;
		}
	}

	switch(protocol) {
	case protocolHttp1_1:
		str << " HTTP/1.1" << "\r\n";
		break;
	case protocolHttp1_0:
		str << " HTTP/1.0" << "\r\n";
		break;
	}

	if ( m_host.empty() )
		m_host = hp;

	str << "Host: " << hp << "\r\n";
	if(agent)
		str << "User-Agent: " << agent << "\r\n";

	if(cookie)
		str << "Cookie: " << cookie << "\r\n";

	if(pragma)
		str << "Pragma: " << pragma << "\r\n";

	if(referer)
		str << "Referer: " << referer << "\r\n";

	switch(auth) {
	case authBasic:
		str << "Authorization: Basic ";
		snprintf(reloc, 64, "%s:%s", user, password);
		b64Encode(reloc, reloc + 64, 128);
		str << reloc + 64 << "\r\n";
	case authAnonymous:
		break;
	}

	switch(proxyAuth) {
	case authBasic:
 		str << "Proxy-Authorization: Basic ";
 		snprintf(reloc, 64, "%s:%s", proxyUser, proxyPasswd);
 		b64Encode(reloc, reloc + 64, 128);
 		str << reloc + 64 << "\r\n";
 		str << "Proxy-Connection: close" << "\r\n";
 	case authAnonymous:
 		break;
 	}


	str << "Connection: close\r\n";
	char **add = extraHeader();
	if(add) {
		while(*add) {
			str << *(add++) << ": ";
			str << *(add++) << "\r\n";
		}
	}
	if(vars)
		switch(urlmethod) {
		case methodHttpPost:
			while(*args) {
				var = *args;
				if(count++ || !strchr(var, '='))
					len += strlen(var) + 1;
				else
					len = strlen(var);
				++args;
			}
			count = 0;
			len += 2;
			str << "Content-Type: application/x-www-form-urlencoded" << "\r\n";
			str << "Content-Length: " << (unsigned)len << "\r\n";
			break;
		case methodHttpPostMultipart:
			while(*args)
				str << *(args++) << "\r\n";
		default:
			break;
		}

	str << "\r\n";
#ifdef HAVE_SSTREAM
	// sstream does not want ends
#else
	str << ends;
#endif

	if(Socket::state != AVAILABLE)
			close();
#ifndef	WIN32
#ifdef	SOICGIFINDEX
	if (localif != NULL) {
		struct ifreq ifr;

		switch(family) {
#ifdef	CCXX_IPV6
		case IPV6:
			sockaddr_in6 source;
			int alen = sizeof(source);

			memset(&ifr, 0, sizeof(ifr));
			setString(ifr.ifr_name, sizeof(ifr.ifr_name), localif);
			if (ioctl(so, SIOCGIFINDEX, &ifr) < 0)
				return errInterface;
			else {
				if (setsockopt(so, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr)) == -1)
					return errInterface;
				else if(getsockname(so, (struct sockaddr*)&source,(socklen_t *) &alen) == -1)
					return errInterface;
				else if (bind(so, (struct sockaddr*)&source, sizeof(source)) == -1)
					return errInterface;
				else
					source.sin6_port = 0;
			}

			break;
#endif
		case IPV4:
			sockaddr_in source;
			int alen = sizeof(source);

			memset(&ifr, 0, sizeof(ifr));
			setString(ifr.ifr_name, sizeof(ifr.ifr_name), localif);
			if (ioctl(so, SIOCGIFINDEX, &ifr) < 0)
				return errInterface;
			else {
				if (setsockopt(so, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr)) == -1)
					return errInterface;
				else if(getsockname(so, (struct sockaddr*)&source,(socklen_t *) &alen) == -1)
					return errInterface;
				else if (bind(so, (struct sockaddr*)&source, sizeof(source)) == -1)
					return errInterface;
				else
					source.sin_port = 0;
			}
		}

	}
#endif
#endif

	if(proxyPort) {
		switch(family) {
#ifdef	CCXX_IPV6
		case IPV6:
			connect(v6proxyHost, proxyPort, (unsigned)buf);
			break;
#endif
		case IPV4:
		        connect(proxyHost, proxyPort, (unsigned)buf);
			break;
		}
	}
	else {
		switch(family) {
#ifdef	CCXX_IPV6
		case IPV6:
			connect(IPV6Host(hp), port, (unsigned)buf);
			break;
#endif
		case IPV4:
			connect(IPV4Host(hp), port, (unsigned)buf);
		}
	}

	if(!isConnected())
		return errUnreachable;

	// FIXME: send (or write) can send less than len bytes
	// use stream funcion ??
#ifdef HAVE_SSTREAM
	writeData(str.str().c_str(), _IOLEN64 str.str().length());
#else
	writeData(str.str().c_str(), _IOLEN64 str.str().length());
#endif

	if(urlmethod == methodHttpPost && vars) {
#ifdef HAVE_SSTREAM
	        str.str() = "";
#else
		str.seekp(0);
#endif
		bool sep = false;
		while(*vars) {
			if(sep)
				writeData("&", 1);
			else
				sep = true;
			var = *vars;
			if(!strchr(var, '=')) {
				snprintf(reloc, sizeof(reloc), "%s=%s", var, *(++vars));
				writeData(reloc, strlen(reloc));
			}
			else
				writeData(var, strlen(var));
			++vars;
		}
		writeData("\r\n", 2);
	}

cont:
#ifdef HAVE_SSTREAM
	char buffer[4096];
#else
	// nothing here
#endif

	len = readLine(buffer, sizeof(buffer) - 1, timeout);
	if(len < 1)
		return errTimeout;

	if(strnicmp(buffer, "HTTP/", 5))
		return errInvalid;

	ref = strchr(buffer, ' ');
	while(*ref == ' ')
		++ref;

	switch(atoi(ref)) {
		default:
		return errInvalid;
	case 100:
		goto cont;
		case 200:
		return errSuccess;
		case 401:
		return errUnauthorized;
		case 403:
		return errForbidden;
		case 404:
		return errMissing;
		case 405:
		return errDenied;
		case 500:
		case 501:
		case 502:
		case 503:
		case 504:
		case 505:
		return errFailure;
		case 300:
		case 301:
		case 302:
		break;
	}
	if(!follow)
		return errRelocated;
	for(;;) {
		len = readLine(reloc, sizeof(reloc), timeout);
		if(len < 1)
			return errTimeout;
		if(!strnicmp(reloc, "Location: ", 10))
			break;
	}
	if(!strnicmp(reloc + 10, "http:", 5)) {
		url = strchr(reloc + 15, '/');
		ep = (char *)(url + strlen(url) - 1);
		while(*ep == '\r' || *ep == '\n')
			*(ep--) = 0;
	}
	else
		url = reloc + 10;
	close();
	goto retry;
}

void URLStream::setAuthentication(Authentication a, const char *value)
{
	auth = a;
	if (auth != authAnonymous) {
		if(!user)
			user = "anonymous";
		if(!password)
			password = "";
	}
}

void URLStream::setProxyAuthentication(Authentication a, const char *value)
{
	proxyAuth = a;
	if (proxyAuth != authAnonymous) {
 		if(!proxyUser)
 			proxyUser = "anonymous";

 		if(!proxyPasswd)
 			proxyPasswd = "";
	}
}

void URLStream::setReferer(const char *str)
{
	if(!str)
		return;
	referer = str;
}

#ifdef	CCXX_NAMESPACES
}
#endif

/** EMACS **
 * Local variables:
 * mode: c++
 * c-basic-offset: 8
 * End:
 */