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/*$T httpd.c GC 1.138 11/17/07 13:10:22 */
 
/*
 * \addtogroup apps @{ £
 * \defgroup httpd Web server @{ The uIP web server is a very simplistic
 * implementation of an HTTP server. It can serve web pages and files from a
 * read-only ROM filesystem, and provides a very small scripting language. £
 * \file Web server \author Adam Dunkels <adam@sics.se> £
 * Copyright (c) 2004, Adam Dunkels. All rights reserved. Redistribution and use
 * in source and binary forms, with or without modification, are permitted
 * provided that the following conditions are met: 1. Redistributions of source
 * code must retain the above copyright notice, this list of conditions and the
 * following disclaimer. 2. Redistributions in binary form must reproduce the
 * above copyright notice, this list of conditions and the following disclaimer in
 * the documentation and/or other materials provided with the distribution. 3.
 * Neither the name of the Institute nor the names of its contributors may be used
 * to endorse or promote products derived from this software without specific
 * prior written permission. THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND
 * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT
 * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
 * OF SUCH DAMAGE. This file is part of the uIP TCP/IP stack. Author: Adam Dunkels
 * <adam@sics.se> $Id: httpd.c 2 2011-07-17 20:13:17Z filepang@gmail.com $
 */
#include "uip.h"
#include "httpd.h"
#include "httpd-fs.h"
#include "httpd-cgi.h"
#include "http-strings.h"
 
#include <string.h>
 
#define STATE_WAITING	0
#define STATE_OUTPUT	1
 
#define ISO_nl			0x0a
#define ISO_space		0x20
#define ISO_bang		0x21
#define ISO_percent		0x25
#define ISO_period		0x2e
#define ISO_slash		0x2f
#define ISO_colon		0x3a
 
/*
 =======================================================================================================================
 =======================================================================================================================
 */
static unsigned short generate_part_of_file(void *state)
{
	/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
	struct httpd_state	*s = (struct httpd_state *) state;
	/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
 
	if(s->file.len > uip_mss())
	{
		s->len = uip_mss();
	}
	else
	{
		s->len = s->file.len;
	}
 
	memcpy(uip_appdata, s->file.data, s->len);
 
	return s->len;
}
 
/*
 =======================================================================================================================
 =======================================================================================================================
 */
static PT_THREAD(send_file (struct httpd_state *s))
{
	PSOCK_BEGIN(&s->sout);
 
	do
	{
		PSOCK_GENERATOR_SEND(&s->sout, generate_part_of_file, s);
		s->file.len -= s->len;
		s->file.data += s->len;
	} while(s->file.len > 0);
 
	PSOCK_END(&s->sout);
}
 
/*
 =======================================================================================================================
 =======================================================================================================================
 */
static PT_THREAD(send_part_of_file (struct httpd_state *s))
{
	PSOCK_BEGIN(&s->sout);
 
	PSOCK_SEND(&s->sout, s->file.data, s->len);
 
	PSOCK_END(&s->sout);
}
 
/*
 =======================================================================================================================
 =======================================================================================================================
 */
static void next_scriptstate(struct httpd_state *s)
{
	/*~~~~~~~*/
	char	*p;
	/*~~~~~~~*/
 
	p = strchr(s->scriptptr, ISO_nl) + 1;
	s->scriptlen -= (unsigned short) (p - s->scriptptr);
	s->scriptptr = p;
}
 
/*
 =======================================================================================================================
 =======================================================================================================================
 */
static PT_THREAD(handle_script (struct httpd_state *s))
{
	/*~~~~~~~~~*/
	char	*ptr;
	/*~~~~~~~~~*/
 
	PT_BEGIN(&s->scriptpt);
 
	while(s->file.len > 0)
	{
		/* Check if we should start executing a script. */
		if(*s->file.data == ISO_percent && *(s->file.data + 1) == ISO_bang)
		{
			s->scriptptr = s->file.data + 3;
			s->scriptlen = s->file.len - 3;
			if(*(s->scriptptr - 1) == ISO_colon)
			{
				httpd_fs_open(s->scriptptr + 1, &s->file);
				PT_WAIT_THREAD(&s->scriptpt, send_file(s));
			}
			else
			{
				PT_WAIT_THREAD(&s->scriptpt, httpd_cgi(s->scriptptr) (s, s->scriptptr));
			}
 
			next_scriptstate(s);
 
			/*
			 * The script is over, so we reset the pointers and continue sending the rest of
			 * the file.
			 */
			s->file.data = s->scriptptr;
			s->file.len = s->scriptlen;
		}
		else
		{
			/* See if we find the start of script marker in the block of HTML to be sent. */
			if(s->file.len > uip_mss())
			{
				s->len = uip_mss();
			}
			else
			{
				s->len = s->file.len;
			}
 
			if(*s->file.data == ISO_percent)
			{
				ptr = strchr(s->file.data + 1, ISO_percent);
			}
			else
			{
				ptr = strchr(s->file.data, ISO_percent);
			}
 
			if(ptr != NULL && ptr != s->file.data)
			{
				s->len = (int) (ptr - s->file.data);
				if(s->len >= uip_mss())
				{
					s->len = uip_mss();
				}
			}
 
			PT_WAIT_THREAD(&s->scriptpt, send_part_of_file(s));
			s->file.data += s->len;
			s->file.len -= s->len;
		}
	}
 
	PT_END(&s->scriptpt);
}
 
/*
 =======================================================================================================================
 =======================================================================================================================
 */
static PT_THREAD(send_headers (struct httpd_state *s, const char *statushdr))
{
	/*~~~~~~~~~*/
	char	*ptr;
	/*~~~~~~~~~*/
 
	PSOCK_BEGIN(&s->sout);
 
	PSOCK_SEND_STR(&s->sout, statushdr);
 
	ptr = strrchr(s->filename, ISO_period);
	if(ptr == NULL)
	{
		PSOCK_SEND_STR(&s->sout, http_content_type_binary);
	}
	else if(strncmp(http_html, ptr, 5) == 0 || strncmp(http_shtml, ptr, 6) == 0)
	{
		PSOCK_SEND_STR(&s->sout, http_content_type_html);
	}
	else if(strncmp(http_css, ptr, 4) == 0)
	{
		PSOCK_SEND_STR(&s->sout, http_content_type_css);
	}
	else if(strncmp(http_png, ptr, 4) == 0)
	{
		PSOCK_SEND_STR(&s->sout, http_content_type_png);
	}
	else if(strncmp(http_gif, ptr, 4) == 0)
	{
		PSOCK_SEND_STR(&s->sout, http_content_type_gif);
	}
	else if(strncmp(http_jpg, ptr, 4) == 0)
	{
		PSOCK_SEND_STR(&s->sout, http_content_type_jpg);
	}
	else
	{
		PSOCK_SEND_STR(&s->sout, http_content_type_plain);
	}
 
	PSOCK_END(&s->sout);
}
 
/*
 =======================================================================================================================
 =======================================================================================================================
 */
static PT_THREAD(handle_output (struct httpd_state *s))
{
	/*~~~~~~~~~*/
	char	*ptr;
	/*~~~~~~~~~*/
 
	PT_BEGIN(&s->outputpt);
 
	if(!httpd_fs_open(s->filename, &s->file))
	{
		httpd_fs_open(http_404_html, &s->file);
		strcpy(s->filename, http_404_html);
		PT_WAIT_THREAD(&s->outputpt, send_headers(s, http_header_404));
		PT_WAIT_THREAD(&s->outputpt, send_file(s));
	}
	else
	{
		PT_WAIT_THREAD(&s->outputpt, send_headers(s, http_header_200));
		ptr = strchr(s->filename, ISO_period);
		if(ptr != NULL && strncmp(ptr, http_shtml, 6) == 0)
		{
			vProcessInput( s->filename );
			PT_INIT(&s->scriptpt);
			PT_WAIT_THREAD(&s->outputpt, handle_script(s));
		}
		else
		{
			PT_WAIT_THREAD(&s->outputpt, send_file(s));
		}
	}
 
	PSOCK_CLOSE(&s->sout);
	PT_END(&s->outputpt);
}
 
/*
 =======================================================================================================================
 =======================================================================================================================
 */
static PT_THREAD(handle_input (struct httpd_state *s))
{
	PSOCK_BEGIN(&s->sin);
 
	PSOCK_READTO(&s->sin, ISO_space);
 
	if(strncmp(s->inputbuf, http_get, 4) != 0)
	{
		PSOCK_CLOSE_EXIT(&s->sin);
	}
 
	PSOCK_READTO(&s->sin, ISO_space);
 
	if(s->inputbuf[0] != ISO_slash)
	{
		PSOCK_CLOSE_EXIT(&s->sin);
	}
 
	if(s->inputbuf[1] == ISO_space)
	{
		strncpy(s->filename, http_index_html, sizeof(s->filename));
	}
	else
	{
		s->inputbuf[PSOCK_DATALEN(&s->sin) - 1] = 0;
 
		/* Process any form input being sent to the server. */
		{
			/*
			 * extern void vApplicationProcessFormInput( char *pcInputString, long
			 * xInputLength ); £
			 * vApplicationProcessFormInput( s->inputbuf, PSOCK_DATALEN(&s->sin) );
			 */
		}
 
		strncpy(s->filename, &s->inputbuf[0], sizeof(s->filename));
	}
 
	/* httpd_log_file(uip_conn->ripaddr, s->filename); */
	s->state = STATE_OUTPUT;
 
	while(1)
	{
		PSOCK_READTO(&s->sin, ISO_nl);
 
		if(strncmp(s->inputbuf, http_referer, 8) == 0)
		{
			s->inputbuf[PSOCK_DATALEN(&s->sin) - 2] = 0;
 
			/* httpd_log(&s->inputbuf[9]); */
		}
	}
 
	PSOCK_END(&s->sin);
}
 
/*
 =======================================================================================================================
 =======================================================================================================================
 */
static void handle_connection(struct httpd_state *s)
{
	handle_input(s);
	if(s->state == STATE_OUTPUT)
	{
		handle_output(s);
	}
}
 
/*
 =======================================================================================================================
 =======================================================================================================================
 */
void httpd_appcall(void)
{
	/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
	struct httpd_state	*s = (struct httpd_state *) &(uip_conn->appstate);
	/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
 
	if(uip_closed() || uip_aborted() || uip_timedout())
	{
	}
	else if(uip_connected())
	{
		PSOCK_INIT(&s->sin, s->inputbuf, sizeof(s->inputbuf) - 1);
		PSOCK_INIT(&s->sout, s->inputbuf, sizeof(s->inputbuf) - 1);
		PT_INIT(&s->outputpt);
		s->state = STATE_WAITING;
 
		/* timer_set(&s->timer, CLOCK_SECOND * 100); */
		s->timer = 0;
		handle_connection(s);
	}
	else if(s != NULL)
	{
		if(uip_poll())
		{
			++s->timer;
			if(s->timer >= 20)
			{
				uip_abort();
			}
		}
		else
		{
			s->timer = 0;
		}
 
		handle_connection(s);
	}
	else
	{
		uip_abort();
	}
}
 
/*
 =======================================================================================================================
    \brief Initialize the web server This function initializes the web server and should be called at system boot-up.
 =======================================================================================================================
 */
void httpd_init(void)
{
	uip_listen(HTONS(80));
}
 
/* @} */