Express Server erstellt

express-server/node_modules/proxy-addr/index.js

@@ -0,0 +1,327 @@
+/*!
+ * proxy-addr
+ * Copyright(c) 2014-2016 Douglas Christopher Wilson
+ * MIT Licensed
+ */
+
+'use strict'
+
+/**
+ * Module exports.
+ * @public
+ */
+
+module.exports = proxyaddr;
+module.exports.all = alladdrs;
+module.exports.compile = compile;
+
+/**
+ * Module dependencies.
+ * @private
+ */
+
+var forwarded = require('forwarded');
+var ipaddr = require('ipaddr.js');
+
+/**
+ * Variables.
+ * @private
+ */
+
+var digitre = /^[0-9]+$/;
+var isip = ipaddr.isValid;
+var parseip = ipaddr.parse;
+
+/**
+ * Pre-defined IP ranges.
+ * @private
+ */
+
+var ipranges = {
+  linklocal: ['169.254.0.0/16', 'fe80::/10'],
+  loopback: ['127.0.0.1/8', '::1/128'],
+  uniquelocal: ['10.0.0.0/8', '172.16.0.0/12', '192.168.0.0/16', 'fc00::/7']
+};
+
+/**
+ * Get all addresses in the request, optionally stopping
+ * at the first untrusted.
+ *
+ * @param {Object} request
+ * @param {Function|Array|String} [trust]
+ * @public
+ */
+
+function alladdrs(req, trust) {
+  // get addresses
+  var addrs = forwarded(req);
+
+  if (!trust) {
+    // Return all addresses
+    return addrs;
+  }
+
+  if (typeof trust !== 'function') {
+    trust = compile(trust);
+  }
+
+  for (var i = 0; i < addrs.length - 1; i++) {
+    if (trust(addrs[i], i)) continue;
+
+    addrs.length = i + 1;
+  }
+
+  return addrs;
+}
+
+/**
+ * Compile argument into trust function.
+ *
+ * @param {Array|String} val
+ * @private
+ */
+
+function compile(val) {
+  if (!val) {
+    throw new TypeError('argument is required');
+  }
+
+  var trust;
+
+  if (typeof val === 'string') {
+    trust = [val];
+  } else if (Array.isArray(val)) {
+    trust = val.slice();
+  } else {
+    throw new TypeError('unsupported trust argument');
+  }
+
+  for (var i = 0; i < trust.length; i++) {
+    val = trust[i];
+
+    if (!ipranges.hasOwnProperty(val)) {
+      continue;
+    }
+
+    // Splice in pre-defined range
+    val = ipranges[val];
+    trust.splice.apply(trust, [i, 1].concat(val));
+    i += val.length - 1;
+  }
+
+  return compileTrust(compileRangeSubnets(trust));
+}
+
+/**
+ * Compile `arr` elements into range subnets.
+ *
+ * @param {Array} arr
+ * @private
+ */
+
+function compileRangeSubnets(arr) {
+  var rangeSubnets = new Array(arr.length);
+
+  for (var i = 0; i < arr.length; i++) {
+    rangeSubnets[i] = parseipNotation(arr[i]);
+  }
+
+  return rangeSubnets;
+}
+
+/**
+ * Compile range subnet array into trust function.
+ *
+ * @param {Array} rangeSubnets
+ * @private
+ */
+
+function compileTrust(rangeSubnets) {
+  // Return optimized function based on length
+  var len = rangeSubnets.length;
+  return len === 0
+    ? trustNone
+    : len === 1
+    ? trustSingle(rangeSubnets[0])
+    : trustMulti(rangeSubnets);
+}
+
+/**
+ * Parse IP notation string into range subnet.
+ *
+ * @param {String} note
+ * @private
+ */
+
+function parseipNotation(note) {
+  var pos = note.lastIndexOf('/');
+  var str = pos !== -1
+    ? note.substring(0, pos)
+    : note;
+
+  if (!isip(str)) {
+    throw new TypeError('invalid IP address: ' + str);
+  }
+
+  var ip = parseip(str);
+
+  if (pos === -1 && ip.kind() === 'ipv6' && ip.isIPv4MappedAddress()) {
+    // Store as IPv4
+    ip = ip.toIPv4Address();
+  }
+
+  var max = ip.kind() === 'ipv6'
+    ? 128
+    : 32;
+
+  var range = pos !== -1
+    ? note.substring(pos + 1, note.length)
+    : null;
+
+  if (range === null) {
+    range = max;
+  } else if (digitre.test(range)) {
+    range = parseInt(range, 10);
+  } else if (ip.kind() === 'ipv4' && isip(range)) {
+    range = parseNetmask(range);
+  } else {
+    range = null;
+  }
+
+  if (range <= 0 || range > max) {
+    throw new TypeError('invalid range on address: ' + note);
+  }
+
+  return [ip, range];
+}
+
+/**
+ * Parse netmask string into CIDR range.
+ *
+ * @param {String} netmask
+ * @private
+ */
+
+function parseNetmask(netmask) {
+  var ip = parseip(netmask);
+  var kind = ip.kind();
+
+  return kind === 'ipv4'
+    ? ip.prefixLengthFromSubnetMask()
+    : null;
+}
+
+/**
+ * Determine address of proxied request.
+ *
+ * @param {Object} request
+ * @param {Function|Array|String} trust
+ * @public
+ */
+
+function proxyaddr(req, trust) {
+  if (!req) {
+    throw new TypeError('req argument is required');
+  }
+
+  if (!trust) {
+    throw new TypeError('trust argument is required');
+  }
+
+  var addrs = alladdrs(req, trust);
+  var addr = addrs[addrs.length - 1];
+
+  return addr;
+}
+
+/**
+ * Static trust function to trust nothing.
+ *
+ * @private
+ */
+
+function trustNone() {
+  return false;
+}
+
+/**
+ * Compile trust function for multiple subnets.
+ *
+ * @param {Array} subnets
+ * @private
+ */
+
+function trustMulti(subnets) {
+  return function trust(addr) {
+    if (!isip(addr)) return false;
+
+    var ip = parseip(addr);
+    var ipconv;
+    var kind = ip.kind();
+
+    for (var i = 0; i < subnets.length; i++) {
+      var subnet = subnets[i];
+      var subnetip = subnet[0];
+      var subnetkind = subnetip.kind();
+      var subnetrange = subnet[1];
+      var trusted = ip;
+
+      if (kind !== subnetkind) {
+        if (subnetkind === 'ipv4' && !ip.isIPv4MappedAddress()) {
+          // Incompatible IP addresses
+          continue;
+        }
+
+        if (!ipconv) {
+          // Convert IP to match subnet IP kind
+          ipconv = subnetkind === 'ipv4'
+            ? ip.toIPv4Address()
+            : ip.toIPv4MappedAddress();
+        }
+
+        trusted = ipconv;
+      }
+
+      if (trusted.match(subnetip, subnetrange)) {
+        return true;
+      }
+    }
+
+    return false;
+  };
+}
+
+/**
+ * Compile trust function for single subnet.
+ *
+ * @param {Object} subnet
+ * @private
+ */
+
+function trustSingle(subnet) {
+  var subnetip = subnet[0];
+  var subnetkind = subnetip.kind();
+  var subnetisipv4 = subnetkind === 'ipv4';
+  var subnetrange = subnet[1];
+
+  return function trust(addr) {
+    if (!isip(addr)) return false;
+
+    var ip = parseip(addr);
+    var kind = ip.kind();
+
+    if (kind !== subnetkind) {
+      if (subnetisipv4 && !ip.isIPv4MappedAddress()) {
+        // Incompatible IP addresses
+        return false;
+      }
+
+      // Convert IP to match subnet IP kind
+      ip = subnetisipv4
+        ? ip.toIPv4Address()
+        : ip.toIPv4MappedAddress();
+    }
+
+    return ip.match(subnetip, subnetrange);
+  };
+}