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/**

 * \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) {

      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;

    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));

}

/*---------------------------------------------------------------------------*/

/** @} */