/*
 * lws-minimal-raw-fallback http-server
 *
 * Written in 2010-2019 by Andy Green <andy@warmcat.com>
 *
 * This file is made available under the Creative Commons CC0 1.0
 * Universal Public Domain Dedication.
 *
 * This demonstrates the most minimal http server you can make with lws.
 *
 * To keep it simple, it serves stuff from the subdirectory
 * "./mount-origin" of the directory it was started in.
 * You can change that by changing mount.origin below.
 *
 * In addition, if the connection does to seem to be talking http, then it
 * falls back to a raw echo protocol.
 */

#include <libwebsockets.h>

enum {
	LWS_SW_D,
	LWS_SW_H,
	LWS_SW_S,
	LWS_SW_U,
	LWS_SW_HELP,
};

static const struct lws_switches switches[] = {
	[LWS_SW_D]	= { "-d",              "Debug logs (e.g. -d 15)" },
	[LWS_SW_H]	= { "-h",              "Strict Host Check / Help" },
	[LWS_SW_S]	= { "-s",              "Use TLS / https" },
	[LWS_SW_U]	= { "-u",              "URL to connect to" },
	[LWS_SW_HELP]	= { "--help",		"Show this help information" },
};

#include <string.h>
#include <signal.h>

struct pss__raw_echo {
	uint8_t buf[2048];
	int len;
};

static int interrupted;

static const struct lws_http_mount mount = {
	.mountpoint		= "/",			/* mountpoint URL */
	.origin			= "./mount-origin",	/* serve from dir */
	.def			= "index.html",		/* default filename */
	.origin_protocol	= LWSMPRO_FILE,		/* files in a dir */
	.mountpoint_len		= 1,			/* char count */
};

static int
callback_raw_echo(struct lws *wsi, enum lws_callback_reasons reason, void *user,
		  void *in, size_t len)
{
	struct pss__raw_echo *pss = (struct pss__raw_echo *)user;

	switch (reason) {
	case LWS_CALLBACK_RAW_ADOPT:
		lwsl_notice("LWS_CALLBACK_RAW_ADOPT\n");
		break;

	case LWS_CALLBACK_RAW_RX:
		lwsl_notice("LWS_CALLBACK_RAW_RX %ld\n", (long)len);
		if (len > sizeof(pss->buf))
			len = sizeof(pss->buf);
		memcpy(pss->buf, in, len);
		pss->len = (int)len;
		lws_callback_on_writable(wsi);
		break;

	case LWS_CALLBACK_RAW_CLOSE:
		lwsl_notice("LWS_CALLBACK_RAW_CLOSE\n");
		break;

	case LWS_CALLBACK_RAW_WRITEABLE:
		lwsl_notice("LWS_CALLBACK_RAW_WRITEABLE\n");
		lws_write(wsi, pss->buf, (unsigned int)pss->len, LWS_WRITE_HTTP);
		break;
	default:
		break;
	}

	return lws_callback_http_dummy(wsi, reason, user, in, len);
}

static const struct lws_protocols protocols[] = {
	{ "raw-echo", callback_raw_echo, sizeof(struct pss__raw_echo), 2048, 0, NULL, 0 },
	LWS_PROTOCOL_LIST_TERM
};

void sigint_handler(int sig)
{
	interrupted = 1;
}

int main(int argc, const char **argv)
{
	struct lws_context_creation_info info;
	struct lws_context *context;
	int n = 0;
	(void)switches;

	if ((argc == 1) || lws_cmdline_option(argc, argv, switches[LWS_SW_HELP].sw)) {
		lws_switches_print_help(argv[0], switches, LWS_ARRAY_SIZE(switches));
		return 0;
	}


	signal(SIGINT, sigint_handler);


	lwsl_user("LWS minimal raw fallback http server | "
		  "visit http://localhost:7681\n");

	lws_context_info_defaults(&info, NULL);
	lws_cmdline_option_handle_builtin(argc, argv, &info);
	info.port = 7681;
	info.protocols = protocols;
	info.mounts = &mount;
	info.error_document_404 = "/404.html";
	info.options =
		LWS_SERVER_OPTION_HTTP_HEADERS_SECURITY_BEST_PRACTICES_ENFORCE |
		LWS_SERVER_OPTION_FALLBACK_TO_APPLY_LISTEN_ACCEPT_CONFIG;
	info.listen_accept_role = "raw-skt";
	info.listen_accept_protocol = "raw-echo";

#if defined(LWS_WITH_TLS)
	if (lws_cmdline_option(argc, argv, switches[LWS_SW_S].sw)) {
		info.options |= LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT |
				LWS_SERVER_OPTION_ALLOW_NON_SSL_ON_SSL_PORT;
		info.ssl_cert_filepath = "localhost-100y.cert";
		info.ssl_private_key_filepath = "localhost-100y.key";

		if (lws_cmdline_option(argc, argv, switches[LWS_SW_U].sw))
			info.options |= LWS_SERVER_OPTION_REDIRECT_HTTP_TO_HTTPS;

		if (lws_cmdline_option(argc, argv, switches[LWS_SW_H].sw))
			info.options |= LWS_SERVER_OPTION_ALLOW_HTTP_ON_HTTPS_LISTENER;
	}
#endif

	context = lws_create_context(&info);
	if (!context) {
		lwsl_err("lws init failed\n");
		return 1;
	}

	while (n >= 0 && !interrupted)
		n = lws_service(context, 0);

	lws_context_destroy(context);

	return 0;
}
