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/**
* HTTP/2 transport. This allows messages to be sent over HTTP/2 streams.
*
* Note that this transport won't work with browser clients. You'll need to use
* the {@link centro-js/lib/server_transports/http2-duplex|http2-duplex}
* transport with browsers.
*
* @module centro-js/lib/server_transports/http2
* @param {Object} config - Configuration options. This supports all the options supported by {@link https://nodejs.org/api/http2.html#http2_http2_createserver_options_onrequesthandler|http2.createServer}, {@link https://nodejs.org/api/http2.html#http2_http2_createsecureserver_options_onrequesthandler|http2.createSecureServer} and {@link https://nodejs.org/api/net.html#net_server_listen_options_callback|net.Server#listen} as well as the following:
* @param {http2.Http2Server|http2.Http2SecureServer} [config.server] - If you want to supply your own HTTP/2 server object. Otherwise, {@link https://nodejs.org/api/http2.html#http2_http2_createserver_options_onrequesthandler|http2.createServer} or {https://nodejs.org/api/http2.html#http2_http2_createsecureserver_options_onrequesthandler|http2.createSecureServer} will be called to create one.
* @param {string} [config.pathname=/centro/v2/http2] - Pathname prefix on which to listen for requests.
* @param {Object} [config.http2] - If present then this is used in preference to `config`.
* @param {Object} [config.access] - Passed to {@link https://github.com/primus/access-control|access-control}.
*/
"use strict";
var http2 = require('http2'),
centro = require('../..'),
access = require('access-control');
const common_headers = {
'Cache-Control': 'max-age=0, no-cache, must-revalidate, proxy-revalidate'
};
function on_close(stream, cb)
{
let called = false;
function cb2()
{
if (!called)
{
called = true;
cb();
}
}
if (stream.closed)
{
return cb2();
}
stream.on('close', cb2);
stream.on('aborted', cb2);
}
module.exports = function (config, authorize, connected, ready, error, warning)
{
config = config.http2 || config;
var certs = config.key && config.cert,
port = config.port || /* istanbul ignore next */ 443,
secure = certs || port === 443,
server = config.server ||
(secure ? http2.createSecureServer(config) :
http2.createServer(config)),
pathname = config.pathname || ('/centro/v' + centro.version + '/http2'),
cors = access(Object.assign(
{
methods: ['GET', 'POST', 'OPTIONS']
}, config.access)),
sessions = new Set(),
num_streams = 0;
function destroy(obj)
{
try
{
obj.destroy();
}
catch (ex)
{
/* istanbul ignore next */
warning(ex);
}
}
function on_session(session)
{
session.on('error', warning);
sessions.add(session);
session.on('close', function ()
{
sessions.delete(this);
});
session.on('stream', function (stream, headers, flags, rawHeaders)
{
stream.on('error', warning);
const req = new http2.Http2ServerRequest(stream, headers, undefined, rawHeaders);
const res = new http2.Http2ServerResponse(stream);
if (cors(req, res))
{
return;
}
if (headers[':path'] !== pathname)
{
return stream.respond(
{
':status': 404,
...res.getHeaders(),
...common_headers
},
{
endStream: true
});
}
if (headers[':method'] !== 'POST')
{
return stream.respond(
{
':status': 405,
...res.getHeaders(),
...common_headers
},
{
endStream: true
});
}
if (server.maxConnections && (num_streams >= server.maxConnections))
{
return stream.respond(
{
':status': 503,
...res.getHeaders(),
...common_headers
},
{
endStream: true
});
}
++num_streams;
on_close(stream, function ()
{
--num_streams;
});
stream.headers = headers;
stream.url = headers[':path'];
stream.on('end', function ()
{
destroy(this);
});
authorize(stream, function ()
{
stream.respond(
{
':status': 503,
...res.getHeaders(),
...common_headers
},
{
endStream: true
});
}, function(cb)
{
on_close(stream, cb);
}, function (err, handshakes, unused_tokens)
{
if (err)
{
stream.respond(
{
':status': err.statusCode,
'Content-Type': 'application/json',
'WWW-Authenticate': err.authenticate,
...res.getHeaders(),
...common_headers
});
return stream.end(JSON.stringify({ error: err.message }));
}
stream.respond(
{
':status': 200,
'Content-Type': 'application/octet-stream',
...res.getHeaders(),
...common_headers
});
connected(handshakes,
stream,
function ()
{
stream.close();
},
function (cb)
{
on_close(stream, cb);
});
});
});
}
server.on('session', on_session);
server.on('error', error);
function listening()
{
ready(null,
{
close: function (cb)
{
server.removeListener('session', on_session);
server.removeListener('error', error);
for (let session of sessions)
{
session.removeAllListeners('stream');
destroy(session);
}
if (config.server)
{
return cb();
}
server.on('session', destroy);
server.close(cb);
},
server: server,
pathname: pathname
});
}
if (config.server)
{
return listening();
}
server.listen(config, listening);
};
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