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Web relay now stream HTTP responces from device to browser, #4172

This commit is contained in:
Ylian Saint-Hilaire 2022-06-27 13:02:46 -07:00
parent caf445505e
commit 087b336492
1 changed files with 103 additions and 5 deletions
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108
apprelays.js
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@ -97,13 +97,13 @@ module.exports.CreateWebRelaySession = function (parent, db, req, args, domain,
// Close any old non-websocket tunnels
const tunnelToRemove = [];
for (var i in tunnels) { if ((tunnels[i].lastOperation < limit) && (tunnels[i].isWebSocket !== true)) { tunnelToRemove.push(tunnels[i]); } }
for (var i in tunnelToRemove) { console.log('session-close-tunnel'); tunnelToRemove[i].close(); }
for (var i in tunnelToRemove) { tunnelToRemove[i].close(); }
// Close this session if no longer used
if (obj.lastOperation < limit) {
var count = 0;
for (var i in tunnels) { count++; }
if (count == 0) { console.log('session-close-self'); close(); } // Time limit reached and no tunnels, clean up.
if (count == 0) { close(); } // Time limit reached and no tunnels, clean up.
}
}
@ -137,7 +137,13 @@ module.exports.CreateWebRelaySession = function (parent, db, req, args, domain,
var count = 0;
for (var i in tunnels) { count += (tunnels[i].isWebSocket ? 0 : 1); }
// If there are none, discard all pending HTTP requests
if (count == 0) { for (var i in pendingRequests) { const x = pendingRequests[i]; x[1].end(); pendingRequests = []; } }
if (count == 0) {
for (var i in pendingRequests) {
const x = pendingRequests[i];
if (x != null) { x[1].end(); }
pendingRequests = [];
}
}
}
tunnel.onconnect = function (tunnelId) { if (pendingRequests.length > 0) { const x = pendingRequests.shift(); tunnels[tunnelId].processRequest(x[0], x[1]); } }
tunnel.oncompleted = function (tunnelId) { if (pendingRequests.length > 0) { const x = pendingRequests.shift(); tunnels[tunnelId].processRequest(x[0], x[1]); } }
@ -327,6 +333,7 @@ module.exports.CreateWebRelay = function (parent, db, args, domain) {
}
}
/*
// Process incoming HTTP data
obj.socketAccumulator = '';
obj.socketParseState = 0;
@ -352,10 +359,10 @@ module.exports.CreateWebRelay = function (parent, db, args, domain) {
}
if (obj.socketParseState == 1) {
var csize = -1;
if ((obj.socketXHeader['connection'] != undefined) && (obj.socketXHeader['connection'].toLowerCase() == 'close') && ((obj.socketXHeader["transfer-encoding"] == undefined) || (obj.socketXHeader["transfer-encoding"].toLowerCase() != 'chunked'))) {
if ((obj.socketXHeader['connection'] != null) && (obj.socketXHeader['connection'].toLowerCase() == 'close') && ((obj.socketXHeader["transfer-encoding"] == null) || (obj.socketXHeader["transfer-encoding"].toLowerCase() != 'chunked'))) {
// The body ends with a close, in this case, we will only process the header
csize = 0;
} else if (obj.socketXHeader['content-length'] != undefined) {
} else if (obj.socketXHeader['content-length'] != null) {
// The body length is specified by the content-length
csize = parseInt(obj.socketXHeader['content-length']);
if (obj.socketAccumulator.length < csize) return;
@ -402,6 +409,97 @@ module.exports.CreateWebRelay = function (parent, db, args, domain) {
// Event completion
if (obj.oncompleted) { obj.oncompleted(obj.tunnelId); }
}
*/
// Process incoming HTTP data
obj.socketAccumulator = '';
obj.socketParseState = 0;
obj.socketContentLengthRemaining = 0;
function processHttpData(data) {
obj.socketAccumulator += data;
while (true) {
//console.log('ACC(' + obj.socketAccumulator + '): ' + obj.socketAccumulator);
if (obj.socketParseState == 0) {
var headersize = obj.socketAccumulator.indexOf('\r\n\r\n');
if (headersize < 0) return;
//obj.Debug("Header: "+obj.socketAccumulator.substring(0, headersize)); // Display received HTTP header
obj.socketHeader = obj.socketAccumulator.substring(0, headersize).split('\r\n');
obj.socketAccumulator = obj.socketAccumulator.substring(headersize + 4);
obj.socketParseState = 1;
obj.socketXHeader = { Directive: obj.socketHeader[0].split(' ') };
for (var i in obj.socketHeader) {
if (i != 0) {
var x2 = obj.socketHeader[i].indexOf(':');
obj.socketXHeader[obj.socketHeader[i].substring(0, x2).toLowerCase()] = obj.socketHeader[i].substring(x2 + 2);
}
}
processHttpResponse(obj.socketXHeader, null, false);
}
if (obj.socketParseState == 1) {
var csize = -1;
if ((obj.socketXHeader['connection'] != null) && (obj.socketXHeader['connection'].toLowerCase() == 'close') && ((obj.socketXHeader["transfer-encoding"] == null) || (obj.socketXHeader["transfer-encoding"].toLowerCase() != 'chunked'))) {
// The body ends with a close, in this case, we will only process the header
processHttpResponse(null, null, true);
csize = 0;
} else if (obj.socketXHeader['content-length'] != null) {
// The body length is specified by the content-length
if (obj.socketContentLengthRemaining == 0) { obj.socketContentLengthRemaining = parseInt(obj.socketXHeader['content-length']); } // Set the remaining content-length if not set
var data = obj.socketAccumulator.substring(0, obj.socketContentLengthRemaining); // Grab the available data, not passed the expected content-length
obj.socketAccumulator = obj.socketAccumulator.substring(data.length); // Remove the data from the accumulator
obj.socketContentLengthRemaining -= data.length; // Substract the obtained data from the expected size
processHttpResponse(null, data, (obj.socketContentLengthRemaining == 0)); // Send any data we have, if we are done, signal the end of the response
if (obj.socketContentLengthRemaining > 0) return; // If more data is needed, return now so we exit the while() loop.
csize = 0; // We are done
} else {
// The body is chunked
var clen = obj.socketAccumulator.indexOf('\r\n');
if (clen < 0) return; // Chunk length not found, exit now and get more data.
// Chunk length if found, lets see if we can get the data.
csize = parseInt(obj.socketAccumulator.substring(0, clen), 16);
if (obj.socketAccumulator.length < clen + 2 + csize + 2) return;
// We got a chunk with all of the data, handle the chunck now.
var data = obj.socketAccumulator.substring(clen + 2, clen + 2 + csize);
obj.socketAccumulator = obj.socketAccumulator.substring(clen + 2 + csize + 2);
processHttpResponse(null, data, (csize == 0));
}
if (csize == 0) {
//obj.Debug("xxOnSocketData DONE: (" + obj.socketData.length + "): " + obj.socketData);
obj.socketParseState = 0;
obj.socketHeader = null;
}
}
}
}
// This is a fully parsed HTTP response from the remote device
function processHttpResponse(header, data, done) {
if (obj.res == null) return;
parent.lastOperation = obj.lastOperation = Date.now(); // Update time of last opertion performed
// If there is a header, send it
if (header != null) {
obj.res.status(parseInt(header.Directive[1])); // Set the status
const blockHeaders = ['Directive']; // These are headers we do not forward
for (var i in header) {
if (i == 'set-cookie') { parent.webCookie = header[i]; } // Keep the cookie, don't forward it
else if (blockHeaders.indexOf(i) == -1) { obj.res.set(i, header[i]); } // Set the headers if not blocked
}
obj.res.set('Content-Security-Policy', "default-src 'self' 'unsafe-inline' 'unsafe-eval' data: blob:;"); // Set an "allow all" policy, see if the can restrict this in the future
}
// If there is data, send it
if (data != null) { obj.res.write(data, 'binary'); }
// If we are done, close the response
if (done == true) {
// Close the response
obj.res.end();
delete obj.res;
// Event completion
if (obj.oncompleted) { obj.oncompleted(obj.tunnelId); }
}
}
// Send data thru the relay tunnel. Written to use TLS if needed.
function send(data) { try { if (obj.tls) { obj.tls.write(data); } else { obj.wsClient.send(data); } } catch (ex) { } }