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var common = exports,
url = require('url'),
extend = require('util')._extend,
required = require('requires-port');
var upgradeHeader = /(^|,)\s*upgrade\s*($|,)/i,
isSSL = /^https|wss/;
/**
* Simple Regex for testing if protocol is https
*/
common.isSSL = isSSL;
/**
* Copies the right headers from `options` and `req` to
* `outgoing` which is then used to fire the proxied
* request.
*
* Examples:
*
* common.setupOutgoing(outgoing, options, req)
* // => { host: ..., hostname: ...}
*
* @param {Object} Outgoing Base object to be filled with required properties
* @param {Object} Options Config object passed to the proxy
* @param {ClientRequest} Req Request Object
* @param {String} Forward String to select forward or target
*
* @return {Object} Outgoing Object with all required properties set
*
* @api private
*/
common.setupOutgoing = function(outgoing, options, req, forward) {
outgoing.port = options[forward || 'target'].port ||
(isSSL.test(options[forward || 'target'].protocol) ? 443 : 80);
['host', 'hostname', 'socketPath', 'pfx', 'key',
'passphrase', 'cert', 'ca', 'ciphers', 'secureProtocol'].forEach(
function(e) { outgoing[e] = options[forward || 'target'][e]; }
);
outgoing.method = options.method || req.method;
outgoing.headers = extend({}, req.headers);
if (options.headers){
extend(outgoing.headers, options.headers);
}
if (options.auth) {
outgoing.auth = options.auth;
}
if (options.ca) {
outgoing.ca = options.ca;
}
if (isSSL.test(options[forward || 'target'].protocol)) {
outgoing.rejectUnauthorized = (typeof options.secure === "undefined") ? true : options.secure;
}
outgoing.agent = options.agent || false;
outgoing.localAddress = options.localAddress;
//
// Remark: If we are false and not upgrading, set the connection: close. This is the right thing to do
// as node core doesn't handle this COMPLETELY properly yet.
//
if (!outgoing.agent) {
outgoing.headers = outgoing.headers || {};
if (typeof outgoing.headers.connection !== 'string'
|| !upgradeHeader.test(outgoing.headers.connection)
) { outgoing.headers.connection = 'close'; }
}
// the final path is target path + relative path requested by user:
var target = options[forward || 'target'];
var targetPath = target && options.prependPath !== false
? (target.path || '')
: '';
//
// Remark: Can we somehow not use url.parse as a perf optimization?
//
var outgoingPath = !options.toProxy
? (url.parse(req.url).path || '')
: req.url;
//
// Remark: ignorePath will just straight up ignore whatever the request's
// path is. This can be labeled as FOOT-GUN material if you do not know what
// you are doing and are using conflicting options.
//
outgoingPath = !options.ignorePath ? outgoingPath : '';
outgoing.path = common.urlJoin(targetPath, outgoingPath);
if (options.changeOrigin) {
outgoing.headers.host =
required(outgoing.port, options[forward || 'target'].protocol) && !hasPort(outgoing.host)
? outgoing.host + ':' + outgoing.port
: outgoing.host;
}
return outgoing;
};
/**
* Set the proper configuration for sockets,
* set no delay and set keep alive, also set
* the timeout to 0.
*
* Examples:
*
* common.setupSocket(socket)
* // => Socket
*
* @param {Socket} Socket instance to setup
*
* @return {Socket} Return the configured socket.
*
* @api private
*/
common.setupSocket = function(socket) {
socket.setTimeout(0);
socket.setNoDelay(true);
socket.setKeepAlive(true, 0);
return socket;
};
/**
* Get the port number from the host. Or guess it based on the connection type.
*
* @param {Request} req Incoming HTTP request.
*
* @return {String} The port number.
*
* @api private
*/
common.getPort = function(req) {
var res = req.headers.host ? req.headers.host.match(/:(\d+)/) : '';
return res ?
res[1] :
common.hasEncryptedConnection(req) ? '443' : '80';
};
/**
* Check if the request has an encrypted connection.
*
* @param {Request} req Incoming HTTP request.
*
* @return {Boolean} Whether the connection is encrypted or not.
*
* @api private
*/
common.hasEncryptedConnection = function(req) {
return Boolean(req.connection.encrypted || req.connection.pair);
};
/**
* OS-agnostic join (doesn't break on URLs like path.join does on Windows)>
*
* @return {String} The generated path.
*
* @api private
*/
common.urlJoin = function() {
//
// We do not want to mess with the query string. All we want to touch is the path.
//
var args = Array.prototype.slice.call(arguments),
lastIndex = args.length - 1,
last = args[lastIndex],
lastSegs = last.split('?'),
retSegs;
args[lastIndex] = lastSegs.shift();
//
// Join all strings, but remove empty strings so we don't get extra slashes from
// joining e.g. ['', 'am']
//
retSegs = [
args.filter(Boolean).join('/')
.replace(/\/+/g, '/')
.replace('http:/', 'http://')
.replace('https:/', 'https://')
];
// Only join the query string if it exists so we don't have trailing a '?'
// on every request
// Handle case where there could be multiple ? in the URL.
retSegs.push.apply(retSegs, lastSegs);
return retSegs.join('?')
};
/**
* Rewrites or removes the domain of a cookie header
*
* @param {String|Array} Header
* @param {Object} Config, mapping of domain to rewritten domain.
* '*' key to match any domain, null value to remove the domain.
*
* @api private
*/
common.rewriteCookieProperty = function rewriteCookieProperty(header, config, property) {
if (Array.isArray(header)) {
return header.map(function (headerElement) {
return rewriteCookieProperty(headerElement, config, property);
});
}
return header.replace(new RegExp("(;\\s*" + property + "=)([^;]+)", 'i'), function(match, prefix, previousValue) {
var newValue;
if (previousValue in config) {
newValue = config[previousValue];
} else if ('*' in config) {
newValue = config['*'];
} else {
//no match, return previous value
return match;
}
if (newValue) {
//replace value
return prefix + newValue;
} else {
//remove value
return '';
}
});
};
/**
* Check the host and see if it potentially has a port in it (keep it simple)
*
* @returns {Boolean} Whether we have one or not
*
* @api private
*/
function hasPort(host) {
return !!~host.indexOf(':');
};