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network-visualization/node_modules/proxy-middleware/index.js

@@ -0,0 +1,141 @@
+var os = require('os');
+var http = require('http');
+var https = require('https');
+var owns = {}.hasOwnProperty;
+
+module.exports = function proxyMiddleware(options) {
+  //enable ability to quickly pass a url for shorthand setup
+  if(typeof options === 'string'){
+      options = require('url').parse(options);
+  }
+
+  var httpLib = options.protocol === 'https:' ? https : http;
+  var request = httpLib.request;
+
+  options = options || {};
+  options.hostname = options.hostname;
+  options.port = options.port;
+  options.pathname = options.pathname || '/';
+
+  return function (req, resp, next) {
+    var url = req.url;
+    // You can pass the route within the options, as well
+    if (typeof options.route === 'string') {
+      if (url === options.route) {
+        url = '';
+      } else if (url.slice(0, options.route.length) === options.route) {
+        url = url.slice(options.route.length);
+      } else {
+        return next();
+      }
+    }
+
+    //options for this request
+    var opts = extend({}, options);
+    if (url && url.charAt(0) === '?') { // prevent /api/resource/?offset=0
+      if (options.pathname.length > 1 && options.pathname.charAt(options.pathname.length - 1) === '/') {
+        opts.path = options.pathname.substring(0, options.pathname.length - 1) + url;
+      } else {
+        opts.path = options.pathname + url;
+      }
+    } else if (url) {
+      opts.path = slashJoin(options.pathname, url);
+    } else {
+      opts.path = options.pathname;
+    }
+    opts.method = req.method;
+    opts.headers = options.headers ? merge(req.headers, options.headers) : req.headers;
+
+    applyViaHeader(req.headers, opts, opts.headers);
+
+    if (!options.preserveHost) {
+      // Forwarding the host breaks dotcloud
+      delete opts.headers.host;
+    }
+
+    var myReq = request(opts, function (myRes) {
+      var statusCode = myRes.statusCode
+        , headers = myRes.headers
+        , location = headers.location;
+      // Fix the location
+      if (((statusCode > 300 && statusCode < 304) || statusCode === 201) && location && location.indexOf(options.href) > -1) {
+        // absoulte path
+        headers.location = location.replace(options.href, slashJoin('/', slashJoin((options.route || ''), '')));
+      }
+      applyViaHeader(myRes.headers, opts, myRes.headers);
+      rewriteCookieHosts(myRes.headers, opts, myRes.headers, req);
+      resp.writeHead(myRes.statusCode, myRes.headers);
+      myRes.on('error', function (err) {
+        next(err);
+      });
+      myRes.pipe(resp);
+    });
+    myReq.on('error', function (err) {
+      next(err);
+    });
+    if (!req.readable) {
+      myReq.end();
+    } else {
+      req.pipe(myReq);
+    }
+  };
+};
+
+function applyViaHeader(existingHeaders, opts, applyTo) {
+  if (!opts.via) return;
+
+  var viaName = (true === opts.via) ?  os.hostname() : opts.via;
+  var viaHeader = '1.1 ' + viaName;
+  if(existingHeaders.via) {
+    viaHeader = existingHeaders.via + ', ' + viaHeader;
+  }
+
+  applyTo.via = viaHeader;
+}
+
+function rewriteCookieHosts(existingHeaders, opts, applyTo, req) {
+  if (!opts.cookieRewrite || !owns.call(existingHeaders, 'set-cookie')) {
+    return;
+  }
+
+  var existingCookies = existingHeaders['set-cookie'],
+      rewrittenCookies = [],
+      rewriteHostname = (true === opts.cookieRewrite) ? os.hostname() : opts.cookieRewrite;
+
+  if (!Array.isArray(existingCookies)) {
+    existingCookies = [ existingCookies ];
+  }
+
+  for (var i = 0; i < existingCookies.length; i++) {
+    var rewrittenCookie = existingCookies[i].replace(/(Domain)=[a-z\.-_]*?(;|$)/gi, '$1=' + rewriteHostname + '$2');
+
+    if (!req.connection.encrypted) {
+      rewrittenCookie = rewrittenCookie.replace(/;\s*?(Secure)/i, '');
+    }
+    rewrittenCookies.push(rewrittenCookie);
+  }
+
+  applyTo['set-cookie'] = rewrittenCookies;
+}
+
+function slashJoin(p1, p2) {
+  var trailing_slash = false;
+
+  if (p1.length && p1[p1.length - 1] === '/') { trailing_slash = true; }
+  if (trailing_slash && p2.length && p2[0] === '/') {p2 = p2.substring(1); }
+
+  return p1 + p2;
+}
+
+function extend(obj, src) {
+  for (var key in src) if (owns.call(src, key)) obj[key] = src[key];
+  return obj;
+}
+
+//merges data without changing state in either argument
+function merge(src1, src2) {
+    var merged = {};
+    extend(merged, src1);
+    extend(merged, src2);
+    return merged;
+}