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var url = require('url')
var httpProxy = require('http-proxy')
var log = require('../logger').create('proxy')
var parseProxyConfig = function (proxies, config) {
var proxyConfig = {}
var endsWithSlash = function (str) {
return str.substr(-1) === '/'
}
if (!proxies) {
return proxyConfig
}
Object.keys(proxies).forEach(function (proxyPath) {
var proxyUrl = proxies[proxyPath]
var proxyDetails = url.parse(proxyUrl)
var pathname = proxyDetails.pathname
// normalize the proxies config
// should we move this to lib/config.js ?
if (endsWithSlash(proxyPath) && !endsWithSlash(proxyUrl)) {
log.warn('proxy "%s" normalized to "%s"', proxyUrl, proxyUrl + '/')
proxyUrl += '/'
pathname += '/'
}
if (!endsWithSlash(proxyPath) && endsWithSlash(proxyUrl)) {
log.warn('proxy "%s" normalized to "%s"', proxyPath, proxyPath + '/')
proxyPath += '/'
}
if (pathname === '/' && !endsWithSlash(proxyUrl)) {
pathname = ''
}
proxyConfig[proxyPath] = {
host: proxyDetails.hostname,
port: proxyDetails.port,
baseProxyUrl: pathname,
https: proxyDetails.protocol === 'https:'
}
if (!proxyConfig[proxyPath].port) {
if (!proxyConfig[proxyPath].host) {
proxyConfig[proxyPath].host = config.hostname
proxyConfig[proxyPath].port = config.port
} else {
proxyConfig[proxyPath].port = proxyConfig[proxyPath].https ? '443' : '80'
}
}
})
return proxyConfig
}
/**
* Returns a handler which understands the proxies and its redirects, along with the proxy to use
* @param proxy A http-proxy.RoutingProxy object with the proxyRequest method
* @param proxies a map of routes to proxy url
* @return {Function} handler function
*/
var createProxyHandler = function (proxy, proxyConfig, proxyValidateSSL, urlRoot, config) {
var proxies = parseProxyConfig(proxyConfig, config)
var proxiesList = Object.keys(proxies).sort().reverse()
if (!proxiesList.length) {
var nullProxy = function createNullProxy (request, response, next) {
return next()
}
nullProxy.upgrade = function upgradeNullProxy () {}
return nullProxy
}
proxy.on('proxyError', function (err, req) {
if (err.code === 'ECONNRESET' && req.socket.destroyed) {
log.debug('failed to proxy %s (browser hung up the socket)', req.url)
} else {
log.warn('failed to proxy %s (%s)', req.url, err.message)
}
})
var middleware = function createProxy (request, response, next) {
for (var i = 0; i < proxiesList.length; i++) {
if (request.url.indexOf(proxiesList[i]) === 0) {
var proxiedUrl = proxies[proxiesList[i]]
log.debug('proxying request - %s to %s:%s', request.url, proxiedUrl.host, proxiedUrl.port)
request.url = request.url.replace(proxiesList[i], proxiedUrl.baseProxyUrl)
proxy.proxyRequest(request, response, {
host: proxiedUrl.host,
port: proxiedUrl.port,
target: {https: proxiedUrl.https, rejectUnauthorized: proxyValidateSSL}
})
return
}
}
return next()
}
middleware.upgrade = function upgradeProxy (request, socket, head) {
// special-case karma's route to avoid upgrading it
if (request.url.indexOf(urlRoot) === 0) {
log.debug('NOT upgrading proxyWebSocketRequest %s', request.url)
return
}
for (var i = 0; i < proxiesList.length; i++) {
if (request.url.indexOf(proxiesList[i]) === 0) {
var proxiedUrl = proxies[proxiesList[i]]
log.debug('upgrade proxyWebSocketRequest %s to %s:%s',
request.url, proxiedUrl.host, proxiedUrl.port)
proxy.proxyWebSocketRequest(request, socket, head,
{host: proxiedUrl.host, port: proxiedUrl.port})
}
}
}
return middleware
}
var createProxyHandlerFactory = function (/* config */ config, /* config.proxies */ proxies,
/* config.proxyValidateSSL */ validateSSL) {
return createProxyHandler(new httpProxy.RoutingProxy({changeOrigin: true}),
proxies, validateSSL, config.urlRoot, config)
}
createProxyHandlerFactory.$inject = ['config', 'config.proxies', 'config.proxyValidateSSL']
exports.create = createProxyHandlerFactory
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