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server.js
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server.js
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// Generated by CoffeeScript 1.12.7
(function() {
var Crypto, Fs, Http, Https, Path, QueryString, Url, accepted_image_mime_types, bind, camo_hostname, content_length_exceeded, content_length_limit, content_length_limit_redirect, current_connections, debug_log, default_security_headers, error_log, finish, four_oh_four, hexdec, keep_alive, logging_enabled, max_redirects, port, process_url, server, shared_key, socket, socket_timeout, started_at, three_oh_three, total_connections, version,
indexOf = [].indexOf || function(item) { for (var i = 0, l = this.length; i < l; i++) { if (i in this && this[i] === item) return i; } return -1; };
Fs = require('fs');
Path = require('path');
Url = require('url');
Http = require('http');
Https = require('https');
Crypto = require('crypto');
QueryString = require('querystring');
port = parseInt(process.env.PORT || 8081, 10);
version = require(Path.resolve(__dirname, "package.json")).version;
shared_key = process.env.CAMO_KEY || '0x24FEEDFACEDEADBEEFCAFE';
max_redirects = process.env.CAMO_MAX_REDIRECTS || 4;
camo_hostname = process.env.CAMO_HOSTNAME || "unknown";
socket = process.env.CAMO_SOCKET;
socket_timeout = process.env.CAMO_SOCKET_TIMEOUT || 10;
logging_enabled = process.env.CAMO_LOGGING_ENABLED || "disabled";
keep_alive = process.env.CAMO_KEEP_ALIVE || "false";
content_length_limit = parseInt(process.env.CAMO_LENGTH_LIMIT || 5242880, 10);
content_length_limit_redirect = process.env.CAMO_LENGTH_LIMIT_REDIRECT || null;
accepted_image_mime_types = JSON.parse(Fs.readFileSync(Path.resolve(__dirname, "mime-types.json"), {
encoding: 'utf8'
}));
debug_log = function(msg) {
if (logging_enabled === "debug") {
console.log("--------------------------------------------");
console.log(msg);
return console.log("--------------------------------------------");
}
};
error_log = function(msg) {
if (logging_enabled !== "disabled") {
return console.error("[" + (new Date().toISOString()) + "] " + msg);
}
};
total_connections = 0;
current_connections = 0;
started_at = new Date;
default_security_headers = {
"X-Frame-Options": "deny",
"X-XSS-Protection": "1; mode=block",
"X-Content-Type-Options": "nosniff",
"Content-Security-Policy": "default-src 'none'; img-src data:; style-src 'unsafe-inline'",
"Strict-Transport-Security": "max-age=31536000; includeSubDomains"
};
four_oh_four = function(resp, msg, url, error) {
error_log("" + msg + ((error != null) || '') + ": " + ((url != null ? url.format() : void 0) || 'unknown'));
resp.writeHead(404, {
expires: "0",
"Cache-Control": "no-cache, no-store, private, must-revalidate",
"X-Frame-Options": default_security_headers["X-Frame-Options"],
"X-XSS-Protection": default_security_headers["X-XSS-Protection"],
"X-Content-Type-Options": default_security_headers["X-Content-Type-Options"],
"Content-Security-Policy": default_security_headers["Content-Security-Policy"],
"Strict-Transport-Security": default_security_headers["Strict-Transport-Security"],
"Camo-Error-Message": msg
});
return finish(resp, "Not Found");
};
three_oh_three = function(resp, location) {
resp.writeHead(303, {
"Location": location
});
return finish(resp, "See Other");
};
content_length_exceeded = function(resp, msg, url) {
if (content_length_limit_redirect != null) {
return three_oh_three(resp, content_length_limit_redirect);
} else {
return four_oh_four(resp, msg, url);
}
};
finish = function(resp, str) {
current_connections -= 1;
if (current_connections < 1) {
current_connections = 0;
}
return resp.connection && resp.end(str);
};
process_url = function(url, transferredHeaders, resp, remaining_redirects) {
var Protocol, queryPath, requestOptions, srcReq;
if (url.host != null) {
if (url.protocol === 'https:') {
Protocol = Https;
} else if (url.protocol === 'http:') {
Protocol = Http;
} else {
four_oh_four(resp, "Unknown protocol", url);
return;
}
queryPath = url.pathname;
if (url.query != null) {
queryPath += "?" + url.query;
}
transferredHeaders.host = url.host;
debug_log(transferredHeaders);
requestOptions = {
hostname: url.hostname,
port: url.port,
path: queryPath,
headers: transferredHeaders
};
if (keep_alive === "false") {
requestOptions['agent'] = false;
}
srcReq = Protocol.get(requestOptions, function(srcResp) {
var contentType, contentTypePrefix, content_length, eTag, expiresHeader, is_finished, lastModified, newHeaders, newUrl, origin;
is_finished = true;
debug_log(srcResp.headers);
content_length = srcResp.headers['content-length'];
if (content_length > content_length_limit) {
srcResp.destroy();
return content_length_exceeded(resp, "Content-Length exceeded", url);
} else {
newHeaders = {
'content-type': srcResp.headers['content-type'],
'cache-control': srcResp.headers['cache-control'] || 'public, max-age=31536000',
'Camo-Host': camo_hostname,
'X-Frame-Options': default_security_headers['X-Frame-Options'],
'X-XSS-Protection': default_security_headers['X-XSS-Protection'],
'X-Content-Type-Options': default_security_headers['X-Content-Type-Options'],
'Content-Security-Policy': default_security_headers['Content-Security-Policy'],
'Strict-Transport-Security': default_security_headers['Strict-Transport-Security']
};
if (eTag = srcResp.headers['etag']) {
newHeaders['etag'] = eTag;
}
if (expiresHeader = srcResp.headers['expires']) {
newHeaders['expires'] = expiresHeader;
}
if (lastModified = srcResp.headers['last-modified']) {
newHeaders['last-modified'] = lastModified;
}
if (origin = process.env.CAMO_TIMING_ALLOW_ORIGIN) {
newHeaders['Timing-Allow-Origin'] = origin;
}
if (content_length != null) {
newHeaders['content-length'] = content_length;
}
if (srcResp.headers['transfer-encoding']) {
newHeaders['transfer-encoding'] = srcResp.headers['transfer-encoding'];
}
if (srcResp.headers['content-encoding']) {
newHeaders['content-encoding'] = srcResp.headers['content-encoding'];
}
srcResp.on('end', function() {
if (is_finished) {
return finish(resp);
}
});
srcResp.on('error', function() {
if (is_finished) {
return finish(resp);
}
});
switch (srcResp.statusCode) {
case 301:
case 302:
case 303:
case 307:
srcResp.destroy();
if (remaining_redirects <= 0) {
return four_oh_four(resp, "Exceeded max depth", url);
} else if (!srcResp.headers['location']) {
return four_oh_four(resp, "Redirect with no location", url);
} else {
is_finished = false;
newUrl = Url.parse(srcResp.headers['location']);
if (!((newUrl.host != null) && (newUrl.hostname != null))) {
newUrl.host = newUrl.hostname = url.hostname;
newUrl.protocol = url.protocol;
}
debug_log("Redirected to " + (newUrl.format()));
return process_url(newUrl, transferredHeaders, resp, remaining_redirects - 1);
}
break;
case 304:
srcResp.destroy();
return resp.writeHead(srcResp.statusCode, newHeaders);
default:
contentType = newHeaders['content-type'];
if (contentType == null) {
srcResp.destroy();
four_oh_four(resp, "No content-type returned", url);
return;
}
contentTypePrefix = contentType.split(";")[0].toLowerCase();
if (indexOf.call(accepted_image_mime_types, contentTypePrefix) < 0) {
srcResp.destroy();
four_oh_four(resp, "Non-Image content-type returned (" + contentTypePrefix + ")", url);
return;
}
debug_log(newHeaders);
resp.writeHead(srcResp.statusCode, newHeaders);
return srcResp.pipe(resp);
}
}
});
srcReq.setTimeout(socket_timeout * 1000, function() {
srcReq.abort();
return four_oh_four(resp, "Socket timeout", url);
});
srcReq.on('error', function(error) {
return four_oh_four(resp, "Client Request error", url, error.stack);
});
resp.on('close', function() {
error_log("Request aborted");
return srcReq.abort();
});
return resp.on('error', function(e) {
error_log("Request error: " + e);
return srcReq.abort();
});
} else {
return four_oh_four(resp, "No host found " + url.host, url);
}
};
hexdec = function(str) {
var buf, i, j, ref;
if (str && str.length > 0 && str.length % 2 === 0 && !str.match(/[^0-9a-f]/)) {
buf = new Buffer(str.length / 2);
for (i = j = 0, ref = str.length; j < ref; i = j += 2) {
buf[i / 2] = parseInt(str.slice(i, +(i + 1) + 1 || 9e9), 16);
}
return buf.toString();
}
};
server = Http.createServer(function(req, resp) {
var base, dest_url, encoded_url, error, hmac, hmac_digest, query_digest, ref, ref1, ref2, transferredHeaders, url, url_type, user_agent;
if (req.method !== 'GET' || req.url === '/') {
resp.writeHead(200, default_security_headers);
return resp.end('hwhat');
} else if (req.url === '/favicon.ico') {
resp.writeHead(200, default_security_headers);
return resp.end('ok');
} else if (req.url === '/status') {
resp.writeHead(200, default_security_headers);
return resp.end("ok " + current_connections + "/" + total_connections + " since " + (started_at.toString()));
} else if (req.url === '/_health/') {
resp.writeHead(200, default_security_headers);
return resp.end('ok');
} else {
total_connections += 1;
current_connections += 1;
url = Url.parse(req.url);
user_agent = (base = process.env).CAMO_HEADER_VIA || (base.CAMO_HEADER_VIA = "Camo Asset Proxy " + version);
transferredHeaders = {
'Via': user_agent,
'User-Agent': user_agent,
'Accept': (ref = req.headers.accept) != null ? ref : 'image/*',
'Accept-Encoding': (ref1 = req.headers['accept-encoding']) != null ? ref1 : '',
"X-Frame-Options": default_security_headers["X-Frame-Options"],
"X-XSS-Protection": default_security_headers["X-XSS-Protection"],
"X-Content-Type-Options": default_security_headers["X-Content-Type-Options"],
"Content-Security-Policy": default_security_headers["Content-Security-Policy"]
};
delete req.headers.cookie;
ref2 = url.pathname.replace(/^\//, '').split("/", 2), query_digest = ref2[0], encoded_url = ref2[1];
if (encoded_url = hexdec(encoded_url)) {
url_type = 'path';
dest_url = encoded_url;
} else {
url_type = 'query';
dest_url = QueryString.parse(url.query).url;
}
debug_log({
type: url_type,
url: req.url,
headers: req.headers,
dest: dest_url,
digest: query_digest
});
if (req.headers['via'] && req.headers['via'].indexOf(user_agent) !== -1) {
return four_oh_four(resp, "Requesting from self");
}
if ((url.pathname != null) && dest_url) {
hmac = Crypto.createHmac("sha1", shared_key);
try {
hmac.update(dest_url, 'utf8');
} catch (error1) {
error = error1;
return four_oh_four(resp, "could not create checksum");
}
hmac_digest = hmac.digest('hex');
if (hmac_digest === query_digest) {
url = Url.parse(dest_url);
return process_url(url, transferredHeaders, resp, max_redirects);
} else {
return four_oh_four(resp, "checksum mismatch", url, hmac_digest + ":" + query_digest);
}
} else {
return four_oh_four(resp, "No pathname provided on the server");
}
}
});
if (socket != null) {
bind = socket;
} else {
bind = port;
}
console.log("SSL-Proxy running on " + bind + " with node:" + process.version + " pid:" + process.pid + " version:" + version + ".");
server.listen(bind);
}).call(this);