update

node_modules/is-url/index.js

@@ -0,0 +1,47 @@
+
+/**
+ * Expose `isUrl`.
+ */
+
+module.exports = isUrl;
+
+/**
+ * RegExps.
+ * A URL must match #1 and then at least one of #2/#3.
+ * Use two levels of REs to avoid REDOS.
+ */
+
+var protocolAndDomainRE = /^(?:\w+:)?\/\/(\S+)$/;
+
+var localhostDomainRE = /^localhost[\:?\d]*(?:[^\:?\d]\S*)?$/
+var nonLocalhostDomainRE = /^[^\s\.]+\.\S{2,}$/;
+
+/**
+ * Loosely validate a URL `string`.
+ *
+ * @param {String} string
+ * @return {Boolean}
+ */
+
+function isUrl(string){
+  if (typeof string !== 'string') {
+    return false;
+  }
+
+  var match = string.match(protocolAndDomainRE);
+  if (!match) {
+    return false;
+  }
+
+  var everythingAfterProtocol = match[1];
+  if (!everythingAfterProtocol) {
+    return false;
+  }
+
+  if (localhostDomainRE.test(everythingAfterProtocol) ||
+      nonLocalhostDomainRE.test(everythingAfterProtocol)) {
+    return true;
+  }
+
+  return false;
+}