/******************************************************************
*  $Id: nanohttp-server.c,v 1.9 2004/08/30 07:55:42 snowdrop Exp $
*
* CSOAP Project:  A http client/server library in C
* Copyright (C) 2003  Ferhat Ayaz
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA  02111-1307, USA.
* 
* Email: ayaz@jprogrammer.net
******************************************************************/
#include <nanohttp/nanohttp-server.h>

#ifdef WIN32
#include "wsockcompat.h"
#include <winsock2.h>
#define close(s) closesocket(s)
#endif

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <pthread.h>
#include <time.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>

#ifndef WIN32
/* According to POSIX 1003.1-2001 */
#include <sys/select.h>

/* According to earlier standards */
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>

#include <fcntl.h>
#endif

typedef struct tag_conndata
{
	hsocket_t sock;
}conndata_t;

/* ----------------------------------------------------- 
nano httpd internally globals
----------------------------------------------------- */
static int _httpd_port = 10000;
static hsocket_t _httpd_socket;
static hservice_t *_httpd_services_head = NULL;
static hservice_t *_httpd_services_tail = NULL;
static int _httpd_run = 1;
static int _httpd_terminate_signal = SIGTERM;

/* ----------------------------------------------------- 
FUNCTION: httpd_init
----------------------------------------------------- */
int httpd_init(int argc, char *argv[])
{
	int i, status;

	/* write argument information */
	log_verbose1("Arguments:");  
	for (i=0;i<argc;i++)
		log_verbose3("argv[%i] = '%s'", i, SAVE_STR(argv[i]));

	/* initialize from arguments */
	for (i=0;i<argc;i++) {
		if (!strcmp(argv[i], NHTTPD_ARG_PORT) && i < argc-1) {
			_httpd_port = atoi(argv[i+1]);
		} else if (!strcmp(argv[i], NHTTPD_ARG_TERMSIG) && i < argc-1) {
			_httpd_terminate_signal = atoi(argv[i+1]);
		}
	}

	log_verbose2("socket bind to port '%d'", _httpd_port);

	/* init built-in services */
	/*
	httpd_register("/httpd/list", service_list);
	*/

	/* create socket */
	hsocket_init(&_httpd_socket);
	status = hsocket_bind(&_httpd_socket, _httpd_port);

	return status;
}

/* ----------------------------------------------------- 
FUNCTION: httpd_register
----------------------------------------------------- */

int httpd_register(const char* ctx,  httpd_service func)
{
	hservice_t* service;
	log_verbose3("register service:t(%p):%s", service, SAVE_STR(ctx));

	service = (hservice_t*)malloc(sizeof(hservice_t));
	service->next = NULL;
	service->func = func;
	strcpy(service->ctx, ctx);

	if (_httpd_services_head == NULL) {
		_httpd_services_head = _httpd_services_tail = service;
	} else {
		_httpd_services_tail->next = service;
		_httpd_services_tail = service;
	}

	return 1;
}


/* ----------------------------------------------------- 
FUNCTION: httpd_services
----------------------------------------------------- */
hservice_t *httpd_services()
{
	return _httpd_services_head;
}


/* ----------------------------------------------------- 
FUNCTION: httpd_find_service
----------------------------------------------------- */
static hservice_t *httpd_find_service(const char* ctx) 
{
	hservice_t *cur = _httpd_services_head;

	while (cur != NULL) {
		if (!strcmp(cur->ctx, ctx)) {
			return cur;
		}
		cur = cur->next;
	}

	return NULL;
}


/* ----------------------------------------------------- 
FUNCTION: httpd_response_set_content_type
----------------------------------------------------- */
void httpd_response_set_content_type(httpd_conn_t *res, 
									 const char* content_type)
{
	strncpy(res->content_type, content_type, 25);
}


/* ----------------------------------------------------- 
FUNCTION: httpd_response_send_header
----------------------------------------------------- */
int httpd_send_header(httpd_conn_t *res, 
					  int code, const char* text, 
					  hpair_t *pair)
{
	struct tm stm;
	time_t nw;
	char buffer[255];
	char header[1024];
	hpair_t *cur;
	int status;

	/* set status code */
	sprintf(header, "HTTP/1.1 %d %s\r\n", code, text);

	/* set date */
	nw = time(NULL);
	localtime_r(&nw, &stm);
	strftime(buffer, 255, "Date: %a, %d %b %y %T GMT", &stm);
	strcat(header, buffer);
	strcat(header, "\r\n");

	/* set content-type */
	/*
	if (res->content_type[0] == '\0') {
	strcat(header, "Content-Type: text/html\r\n");
	} else {
	sprintf(buffer, "Content-Type: %s\r\n", res->content_type);
	strcat(header, buffer);
	}
	*/

	/* set server name */
	strcat(header, "Server: Nano HTTPD library\r\n");

	/* set connection status */
	strcat(header, "Connection: close\r\n");

	/* add pairs */
	cur = pair;
	while (cur != NULL) {
		sprintf(buffer, "%s: %s\r\n", cur->key, cur->value);
		strcat(header, buffer);
		cur = cur->next;
	}

	/* set end of header */
	strcat(header, "\r\n");

	/* send header */
	status = hsocket_nsend(res->sock, header, strlen(header));

	return status;
}


int httpd_send_internal_error(httpd_conn_t *conn, const char* errmsg)
{
	const char *template1 =
		"<html><body><h3>Error!</h3><hr> Message: '%s' </body></html>\r\n";

	char buffer[4064];
	sprintf(buffer, template1, errmsg);
	httpd_send_header(conn, 500, "INTERNAL", NULL);
	return send(conn->sock, buffer, strlen(buffer), 0);
}

/* ----------------------------------------------------- 
FUNCTION: httpd_request_print
----------------------------------------------------- */
static void httpd_request_print(hrequest_t *req) 
{
	hpair_t *pair;

	log_verbose1("++++++ Request +++++++++");
	log_verbose2(" Method : '%s'", req->method);
	log_verbose2(" Path   : '%s'", req->path);
	log_verbose2(" Spec   : '%s'", req->spec);
	log_verbose1(" Parsed query string :");

	pair = req->query;
	while (pair != NULL) {
		log_verbose3(" %s = '%s'", pair->key, pair->value);
		pair = pair->next;
	}
	log_verbose1("++++++++++++++++++++++++");

}

/* ----------------------------------------------------- 
FUNCTION: httpd_session_main
----------------------------------------------------- */
static void* httpd_session_main(void *data)
{
	conndata_t *conn = (conndata_t*)data;
	const char *msg = "SESSION 1.0\n";
	int len = strlen(msg);
	char ch[2];
	char buffer[256]; /* temp buffer for recv() */
	char header[4064]; /* received header */
	int total; /* result from recv() */
	int hindex; /* searching end of header */
	int headerreached =0; /* whether reach header "\n\n" */
	hrequest_t* req = NULL; /* only for test */
	httpd_conn_t *rconn;
	hservice_t* service = NULL;
	char *content_length_str;
	long content_length = 0;

	header[0] = '\0';
	len = 0;


	log_verbose1("starting httpd_session_main()");

	while (len < 4064) {
		/*printf("receiving ...\n");*/
		total = recv(conn->sock, ch, 1, 0);
		if (total==0) break;
		header[len] = ch[0];
		len++;
		if (len > 3) {
			if (!strncmp(&header[len-4], "\r\n\r\n", 4)) {
				header[len] = '\0';
				break;
			}
		}
	}

	/*  log_verbose2("=== HEADER ===\n%s\n============\n", header);*/
	/* call the service */
	req = hrequest_new_from_buffer(header);
	httpd_request_print(req);


	rconn = (httpd_conn_t*)malloc(sizeof(httpd_conn_t));
	rconn->sock = conn->sock;
	rconn->content_type[0] = '\0';

	service = httpd_find_service(req->path);
	if (service != NULL) {
		log_verbose2("service '%s' found", req->path);
		if (service->func != NULL) {
			service->func(rconn, req);
		} else {
			sprintf(buffer, 
				"service '%s' not registered properly (func == NULL)", 
				req->path);
			log_verbose1(buffer);
			httpd_send_internal_error(rconn, buffer);
		}
	} else {
		sprintf(buffer, "service '%s' not found", req->path);
		log_verbose1(buffer);
		httpd_send_internal_error(rconn, buffer);
	}

	close(conn->sock);

	/*  httpd_response_free(res);*/
	hrequest_free(req);

	pthread_exit(NULL);
	return service;
} 


/* ----------------------------------------------------- 
FUNCTION: httpd_term
----------------------------------------------------- */
void httpd_term(int sig)
{
	if (sig == _httpd_terminate_signal)
		_httpd_run = 0;
}

/* ----------------------------------------------------- 
FUNCTION: httpd_run
----------------------------------------------------- */

int httpd_run()
{
	conndata_t *conn;
	pthread_t tid;
	pthread_attr_t attr;
	hsocket_t sockfd;
	int err;
	fd_set fds;
	struct timeval timeout;


#ifndef WIN32
#if HSOCKET_BLOCKMODE!=0
#endif
#else
	unsigned long iMode=HSOCKET_BLOCKMODE;
#endif

pthread_attr_init(&attr);
#ifdef PTHREAD_CREATE_DETACHED
	pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
#endif


	log_verbose1("starting run routine");
	timeout.tv_sec = 1;
	timeout.tv_usec = 0;

	/* listen to port */
	err = hsocket_listen(_httpd_socket,15);
	if (err  != HSOCKET_OK) {
		log_error2("httpd_run(): '%d'", err);
		return err;
	}

	log_verbose2("registering termination signal handler (SIGNAL:%d)", _httpd_terminate_signal);
	signal(_httpd_terminate_signal, httpd_term);
	log_verbose2("listening to port '%d'", _httpd_port);


#ifndef WIN32
#if HSOCKET_BLOCKMODE!=0
		fcntl(_httpd_socket, F_SETFL, O_NONBLOCK);
#endif
#else
	if(ioctlsocket(_httpd_socket, FIONBIO, (u_long FAR*) &iMode) == INVALID_SOCKET)
	{
		log_error1("ioctlsocket error");
		return -1;
	}
#endif

	timeout.tv_sec = 1;
	timeout.tv_usec = 0;

	while (_httpd_run) {

		FD_ZERO(&fds);
		FD_SET(_httpd_socket, &fds);

#ifndef WIN32
		select(1, &fds, NULL, NULL, &timeout);
#else
		if(select(1, &fds, NULL, NULL, &timeout)==SOCKET_ERROR)
		{
			err=WSAGetLastError();
			log_error1("select error");
			return -1;
		}
#endif

		while (_httpd_run && (FD_ISSET(_httpd_socket, &fds))) 

			if (!_httpd_run)
				break;

		if (hsocket_accept(_httpd_socket, &sockfd) != HSOCKET_OK) {
			continue;
		}


		conn = (conndata_t*)malloc(sizeof(conndata_t));
		conn->sock = sockfd;

		err = pthread_create(&tid, &attr, httpd_session_main, conn); 
		if (err) {
			log_error2("Error creating thread: ('%d')", err);
		}
	}

	return 0;
}




char *httpd_get_postdata(httpd_conn_t *conn, hrequest_t *req, long *received, long max)
{
	char *content_length_str;
	long content_length = 0;
	long total = 0;
	char *postdata = NULL;

	if (!strcmp(req->method, "POST")) {

		content_length_str = 
			hpairnode_get_ignore_case(req->header, HEADER_CONTENT_LENGTH);

		if (content_length_str != NULL)
			content_length = atol(content_length_str);

	} else {
		log_warn1("Not a POST method");
		return NULL;
	}      

	if (content_length > max && max != -1) 
		return NULL;

	if (content_length == 0) {
		*received = 0;
		postdata = (char*)malloc(1);
		postdata[0] = '\0';
		return postdata;
	}

	postdata = (char*)malloc(content_length+1);
	if (postdata == NULL) {
		log_error1("Not enough memory");
		return NULL;
	}


	if (hsocket_read(conn->sock, postdata, 
		(int)content_length, 1) == HSOCKET_OK) {
			*received = content_length;
			postdata[content_length] = '\0';
			return postdata;
		}

		free (postdata);
		return NULL;

}