/*          __                               _
*    ____  / /_  ____ ___  __  ___________ _(_)
*   / __ \/ __ \/ __ `__ \/ / / / ___/ __ `/ /
*  / /_/ / / / / / / / / / /_/ / /__/ /_/ / /
*  \____/_/ /_/_/ /_/ /_/\__, /\___/\__, /_/
*                       /____/     /____/
*
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2021, Max Christian Pohle <max@coderonline.de>
*
* 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.
*
* {{{ DISCLAIMER
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
* }}}
*/

// {{{ INCLUDES
#include <stddef.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h> // required for FreeBSD
#include <err.h>
#include <errno.h>
#include <arpa/inet.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <syslog.h>
// #include <pthread.h>      // maybe later
// }}}

// {{{ MACROS
#define EWOULDBLOCK_DELAY     100
#define READ_BUFFER_LENGTH    9000 // jumboframe?
#define POST_DATA_MAX_LENGTH  18000
#define DEBUG_SLEEP_TIME      50000

#ifndef DEBUG
#define DEBUG(X, ...) // (X, ...)
#else
#include <stdarg.h>
static inline int verbose(const char * format, ...) {
	va_list va; va_start(va, format); usleep(DEBUG_SLEEP_TIME); return vprintf(format, va);
}
#undef DEBUG
#define DEBUG verbose
#endif
// }}}

typedef struct {
	int    newline_length; // lenght of one newline in bytes (\n has 1, CR/LF has 2)
	char * method;         // GET/POST or something like that
	char * url;            // request URL (e.g. /index.html)
	char * boundary;       // usually looks similar to ------1234
	size_t boundary_size;  // size in bytes, calculated after first header complete; is an indicator for the first header
	char * content_type;   // sometimes 'text/html', also sometimes 'text/html; boundary=------1234'
	char * content_disposition; // includes file names of uploaded files or field names with form-data (e.g. curl -F)
} Http_Header;

void next_part(Http_Header * http_header, const char * content, size_t content_size);
void send_answer(Http_Header * http_header, FILE * socket);
void parse_http(size_t new_socket, char * request, size_t request_length);

// modeline for vim: shiftwidth=2 tabstop=2 number foldmethod=marker foldenable