/*
 * Copyright 2023, Vincent Douillet <vincent@vdouillet.fr>
 *
 * 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 copyright holder 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 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 HOLDER 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.
 */

#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "browse.h"
#include "cgi.h"
#include "config.h"
#include "download.h"
#include "http.h"

enum page {
	PAGE_BROWSE,
	PAGE_DOWNLOAD,
	PAGE__MAX
};

static const char *const pages[PAGE__MAX] = {
	BROWSE_URL,
	DOWNLOAD_URL
};

int
main(void)
{
	char   *data_dir;
	enum kcgi_err parse_err;
	struct kreq r;
	struct http_ret ret;

	if (kutil_openlog(LOG_FILE) == 0)
		http_exit(NULL, KHTTP_500, "Unable to open %s", LOG_FILE);

	parse_err = khttp_parse(&r, NULL, 0, pages, PAGE__MAX, PAGE_BROWSE);
	if (parse_err != KCGI_OK)
		http_exit(NULL, KHTTP_500, "Unable to parse request: %s",
			  kcgi_strerror(parse_err));

	data_dir = config_data_dir();
	if (data_dir == NULL)
		http_exit(NULL, KHTTP_500, "Data dir not configured");

	/* A bit of security cannot hurt */
	if (-1 == unveil(data_dir, "r")
	    || -1 == unveil(TEMPLATE_DIR, "r")
	    || -1 == unveil(NULL, NULL))
		http_exit(&r, KHTTP_500, "Unveil failed: %s", strerror(errno));
	if (-1 == pledge("stdio rpath wpath cpath", NULL))
		http_exit(&r, KHTTP_500, "Pledge failed: %s", strerror(errno));

	/*
	 * Make sure basic request parameters are as expected : GET or POST,
	 * valid page and HTML document
	 */
	if (r.method != KMETHOD_GET && r.method != KMETHOD_POST)
		http_exit(&r, KHTTP_405, NULL);
	if (r.page == PAGE__MAX)
		http_exit(&r, KHTTP_404, NULL);

	switch (r.page) {
	case PAGE_BROWSE:
		if (r.mime != KMIME_TEXT_HTML)
			http_exit(&r, KHTTP_406, NULL);	/* Not Acceptable */
		ret = browse(&r);
		break;
	case PAGE_DOWNLOAD:
		ret = download(&r);
		break;
	default:
		http_exit(&r, KHTTP_404, NULL);
	}

	khttp_free(&r);

	if (ret.code >= KHTTP_400)
		http_exit(&r, ret.code, ret.message);

	return EXIT_SUCCESS;
}