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server.cjs
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server.cjs
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/*eslint-env node*/
"use strict";
(function () {
var express = require("express");
var compression = require("compression");
var fs = require("fs");
var url = require("url");
var request = require("request");
var gzipHeader = Buffer.from("1F8B08", "hex");
var yargs = require("yargs").options({
port: {
default: 8080,
description: "Port to listen on.",
},
public: {
type: "boolean",
description: "Run a public server that listens on all interfaces.",
},
"upstream-proxy": {
description:
'A standard proxy server that will be used to retrieve data. Specify a URL including port, e.g. "http://proxy:8000".',
},
"bypass-upstream-proxy-hosts": {
description:
'A comma separated list of hosts that will bypass the specified upstream_proxy, e.g. "lanhost1,lanhost2"',
},
help: {
alias: "h",
type: "boolean",
description: "Show this help.",
},
});
var argv = yargs.argv;
if (argv.help) {
return yargs.showHelp();
}
// eventually this mime type configuration will need to change
// https://github.com/visionmedia/send/commit/d2cb54658ce65948b0ed6e5fb5de69d022bef941
// *NOTE* Any changes you make here must be mirrored in web.config.
var mime = express.static.mime;
mime.define(
{
"application/json": ["czml", "json", "geojson", "topojson"],
"application/wasm": ["wasm"],
"image/crn": ["crn"],
"image/ktx": ["ktx"],
"model/gltf+json": ["gltf"],
"model/gltf-binary": ["bgltf", "glb"],
"application/octet-stream": [
"b3dm",
"pnts",
"i3dm",
"cmpt",
"geom",
"vctr",
],
"text/plain": ["glsl"],
},
true
);
var app = express();
app.use(compression());
app.use(function (req, res, next) {
res.header("Access-Control-Allow-Origin", "*");
res.header(
"Access-Control-Allow-Headers",
"Origin, X-Requested-With, Content-Type, Accept"
);
next();
});
function checkGzipAndNext(req, res, next) {
var reqUrl = url.parse(req.url, true);
var filePath = reqUrl.pathname.substring(1);
var readStream = fs.createReadStream(filePath, { start: 0, end: 2 });
readStream.on("error", function (err) {
next();
});
readStream.on("data", function (chunk) {
if (chunk.equals(gzipHeader)) {
res.header("Content-Encoding", "gzip");
}
next();
});
}
var knownTilesetFormats = [
/\.b3dm/,
/\.pnts/,
/\.i3dm/,
/\.cmpt/,
/\.glb/,
/\.geom/,
/\.vctr/,
/tileset.*\.json$/,
];
app.get(knownTilesetFormats, checkGzipAndNext);
app.use(express.static(__dirname));
function getRemoteUrlFromParam(req) {
var remoteUrl = req.params[0];
if (remoteUrl) {
// add http:// to the URL if no protocol is present
if (!/^https?:\/\//.test(remoteUrl)) {
remoteUrl = "http://" + remoteUrl;
}
remoteUrl = url.parse(remoteUrl);
// copy query string
remoteUrl.search = url.parse(req.url).search;
}
return remoteUrl;
}
var dontProxyHeaderRegex = /^(?:Host|Proxy-Connection|Connection|Keep-Alive|Transfer-Encoding|TE|Trailer|Proxy-Authorization|Proxy-Authenticate|Upgrade)$/i;
function filterHeaders(req, headers) {
var result = {};
// filter out headers that are listed in the regex above
Object.keys(headers).forEach(function (name) {
if (!dontProxyHeaderRegex.test(name)) {
result[name] = headers[name];
}
});
return result;
}
var upstreamProxy = argv["upstream-proxy"];
var bypassUpstreamProxyHosts = {};
if (argv["bypass-upstream-proxy-hosts"]) {
argv["bypass-upstream-proxy-hosts"].split(",").forEach(function (host) {
bypassUpstreamProxyHosts[host.toLowerCase()] = true;
});
}
app.get("/proxy/*", function (req, res, next) {
// look for request like http://localhost:8080/proxy/http://example.com/file?query=1
var remoteUrl = getRemoteUrlFromParam(req);
if (!remoteUrl) {
// look for request like http://localhost:8080/proxy/?http%3A%2F%2Fexample.com%2Ffile%3Fquery%3D1
remoteUrl = Object.keys(req.query)[0];
if (remoteUrl) {
remoteUrl = url.parse(remoteUrl);
}
}
if (!remoteUrl) {
return res.status(400).send("No url specified.");
}
if (!remoteUrl.protocol) {
remoteUrl.protocol = "http:";
}
var proxy;
if (upstreamProxy && !(remoteUrl.host in bypassUpstreamProxyHosts)) {
proxy = upstreamProxy;
}
// encoding : null means "body" passed to the callback will be raw bytes
request.get(
{
url: url.format(remoteUrl),
headers: filterHeaders(req, req.headers),
encoding: null,
proxy: proxy,
},
function (error, response, body) {
var code = 500;
if (response) {
code = response.statusCode;
res.header(filterHeaders(req, response.headers));
}
res.status(code).send(body);
}
);
});
var server = app.listen(
argv.port,
argv.public ? undefined : "localhost",
function () {
if (argv.public) {
console.log(
"Cesium development server running publicly. Connect to http://localhost:%d/",
server.address().port
);
} else {
console.log(
"Cesium development server running locally. Connect to http://localhost:%d/",
server.address().port
);
}
}
);
server.on("error", function (e) {
if (e.code === "EADDRINUSE") {
console.log(
"Error: Port %d is already in use, select a different port.",
argv.port
);
console.log("Example: node server.cjs --port %d", argv.port + 1);
} else if (e.code === "EACCES") {
console.log(
"Error: This process does not have permission to listen on port %d.",
argv.port
);
if (argv.port < 1024) {
console.log("Try a port number higher than 1024.");
}
}
console.log(e);
process.exit(1);
});
server.on("close", function () {
console.log("Cesium development server stopped.");
});
var isFirstSig = true;
process.on("SIGINT", function () {
if (isFirstSig) {
console.log("Cesium development server shutting down.");
server.close(function () {
process.exit(0);
});
isFirstSig = false;
} else {
console.log("Cesium development server force kill.");
process.exit(1);
}
});
})();