text: /*
   * libwebsockets - small server side websockets and web server implementation
   *
   * Copyright (C) 2020 Andy Green <andy@warmcat.com>
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to
   * deal in the Software without restriction, including without limitation the
   * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
   * sell copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in
   * all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
   * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
   * IN THE SOFTWARE.
   *
   * C++ classes for Secure Streams
   */
  
  #include <libwebsockets.hxx>
  
  static const char *pcols[] = {
  	"http://",	/* LWSSSP_H1 */
  	"https://",
  	"h2://",	/* LWSSSP_H2 */
  	"h2s://",
  	"ws://",	/* LWSSSP_WS */
  	"wss://",
  	"mqtt://",	/* LWSSSP_MQTT */
  	"mqtts://",
  	"raw://",	/* LWSSSP_RAW */
  	"raws://",
  };
  
  static const uint8_t pcols_len[] = {
  	7, 8, 5, 6, 5, 6, 7, 8, 6, 7
  };
  
  static const uint16_t pcols_port[] = {
  	80, 443, 443, 443, 80, 443, 1883, 8883, 80, 443
  };
  
  lss::lss(lws_ctx_t _ctx, std::string _uri, lsscomp_t _comp, bool _psh,
  	 lws_sscb_rx rx, lws_sscb_tx tx, lws_sscb_state state)
  {
  	const char *p, *urlpath;
  	lws_ss_info_t ssi;
  	int n, port;
  
  	memset(&ssi, 0, sizeof(ssi));
  	memset(&pol, 0, sizeof(pol));
  
  	ctx		= _ctx;
  	comp		= _comp;
  	comp_done	= 0;
  	rxlen		= 0;
  
  	/*
  	 * We have a common stub userdata, our "real" userdata is in the
  	 * derived class members.   The Opaque user pointer points to the
  	 * lss itself.
  	 */
  
  	ssi.handle_offset	    = offsetof(lssPriv, lssPriv::m_ss);
  	ssi.opaque_user_data_offset = offsetof(lssPriv, lssPriv::m_plss);
  
  	ssi.user_alloc	= sizeof(lssPriv);
  	ssi.rx		= rx;
  	ssi.tx		= tx;
  	ssi.state	= state;
  	ssi.policy	= &pol; /* we will provide our own policy */
  
  	/*
  	 * _uri is like "https://warmcat.com:443/index.html"... we need to
  	 * deconstruct it into its policy implications
  	 */
  
  	uri = strdup(_uri.c_str());
  
  	for (n = 0; n < LWS_ARRAY_SIZE(pcols); n++)
  		if (!strncmp(uri, pcols[n], pcols_len[n]))
  			break;
  
  	if (n == LWS_ARRAY_SIZE(pcols))
  		throw lssException("unknown uri protocol://");
  
  	pol.protocol = n >> 1;
  	if (n & 1)
  		pol.flags |= LWSSSPOLF_TLS;
  
  	n = pcols_port[n];
  
  	if (lws_parse_uri(uri, &p, &pol.endpoint, &n, &urlpath))
  		throw lssException("unable to parse uri://");
  
  	pol.port = (uint16_t)n;
  
  	if (pol.protocol <= LWSSSP_WS) {
  		pol.u.http.url = urlpath;
  
  		/*
  		 * These are workarounds for common h2 server noncompliances
  		 */
  
  		pol.flags |= LWSSSPOLF_QUIRK_NGHTTP2_END_STREAM |
  			     LWSSSPOLF_H2_QUIRK_OVERFLOWS_TXCR |
  			     LWSSSPOLF_H2_QUIRK_UNCLEAN_HPACK_STATE;
  
  		if (pol.protocol < LWSSSP_WS)
  			pol.u.http.method = _psh ? "POST" : "GET";
  	}
  
  	us_start = lws_now_usecs();
  
  	if (lws_ss_create(ctx, 0, &ssi, (void *)this, &m_ss, NULL, NULL))
  		goto blow;
  
  	if (pol.protocol <= LWSSSP_WS)
  		lws_ss_client_connect(m_ss);
  
  	return;
  
  blow:
  	if (uri)
  		free(uri);
  	throw lssException("ss creation failed");
  }
  
  lss::~lss()
  {
  	if (uri)
  		free(uri);
  	if (m_ss)
  		lws_ss_destroy(&m_ss);
  }
  
  int lss::call_completion(lws_ss_constate_t state)
  {
  	if (comp_done)
  		return 0;
  	if (!comp)
  		return 0;
  
  	comp_done = 1;
  
  	return comp(this, state, NULL);
  }
  