JWT Autorization / Logging in and registering

node_modules/validator/es/lib/isIP.js

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+import assertString from './util/assertString';
+/**
+11.3.  Examples
+
+   The following addresses
+
+             fe80::1234 (on the 1st link of the node)
+             ff02::5678 (on the 5th link of the node)
+             ff08::9abc (on the 10th organization of the node)
+
+   would be represented as follows:
+
+             fe80::1234%1
+             ff02::5678%5
+             ff08::9abc%10
+
+   (Here we assume a natural translation from a zone index to the
+   <zone_id> part, where the Nth zone of any scope is translated into
+   "N".)
+
+   If we use interface names as <zone_id>, those addresses could also be
+   represented as follows:
+
+            fe80::1234%ne0
+            ff02::5678%pvc1.3
+            ff08::9abc%interface10
+
+   where the interface "ne0" belongs to the 1st link, "pvc1.3" belongs
+   to the 5th link, and "interface10" belongs to the 10th organization.
+ * * */
+
+var ipv4Maybe = /^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$/;
+var ipv6Block = /^[0-9A-F]{1,4}$/i;
+export default function isIP(str) {
+  var version = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : '';
+  assertString(str);
+  version = String(version);
+
+  if (!version) {
+    return isIP(str, 4) || isIP(str, 6);
+  } else if (version === '4') {
+    if (!ipv4Maybe.test(str)) {
+      return false;
+    }
+
+    var parts = str.split('.').sort(function (a, b) {
+      return a - b;
+    });
+    return parts[3] <= 255;
+  } else if (version === '6') {
+    var addressAndZone = [str]; // ipv6 addresses could have scoped architecture
+    // according to https://tools.ietf.org/html/rfc4007#section-11
+
+    if (str.includes('%')) {
+      addressAndZone = str.split('%');
+
+      if (addressAndZone.length !== 2) {
+        // it must be just two parts
+        return false;
+      }
+
+      if (!addressAndZone[0].includes(':')) {
+        // the first part must be the address
+        return false;
+      }
+
+      if (addressAndZone[1] === '') {
+        // the second part must not be empty
+        return false;
+      }
+    }
+
+    var blocks = addressAndZone[0].split(':');
+    var foundOmissionBlock = false; // marker to indicate ::
+    // At least some OS accept the last 32 bits of an IPv6 address
+    // (i.e. 2 of the blocks) in IPv4 notation, and RFC 3493 says
+    // that '::ffff:a.b.c.d' is valid for IPv4-mapped IPv6 addresses,
+    // and '::a.b.c.d' is deprecated, but also valid.
+
+    var foundIPv4TransitionBlock = isIP(blocks[blocks.length - 1], 4);
+    var expectedNumberOfBlocks = foundIPv4TransitionBlock ? 7 : 8;
+
+    if (blocks.length > expectedNumberOfBlocks) {
+      return false;
+    } // initial or final ::
+
+
+    if (str === '::') {
+      return true;
+    } else if (str.substr(0, 2) === '::') {
+      blocks.shift();
+      blocks.shift();
+      foundOmissionBlock = true;
+    } else if (str.substr(str.length - 2) === '::') {
+      blocks.pop();
+      blocks.pop();
+      foundOmissionBlock = true;
+    }
+
+    for (var i = 0; i < blocks.length; ++i) {
+      // test for a :: which can not be at the string start/end
+      // since those cases have been handled above
+      if (blocks[i] === '' && i > 0 && i < blocks.length - 1) {
+        if (foundOmissionBlock) {
+          return false; // multiple :: in address
+        }
+
+        foundOmissionBlock = true;
+      } else if (foundIPv4TransitionBlock && i === blocks.length - 1) {// it has been checked before that the last
+        // block is a valid IPv4 address
+      } else if (!ipv6Block.test(blocks[i])) {
+        return false;
+      }
+    }
+
+    if (foundOmissionBlock) {
+      return blocks.length >= 1;
+    }
+
+    return blocks.length === expectedNumberOfBlocks;
+  }
+
+  return false;
+}