Added isUrl validator

mod.ts

@@ -77,6 +77,7 @@ import isSemVer from "./src/lib/isSemVer.ts";
 import isSlug from "./src/lib/isSlug.ts";
 import isSurrogatePair from "./src/lib/isSurrogatePair.ts";
 import isUpperCase from "./src/lib/isUpperCase.ts";
+import isURL from "./src/lib/isURL.ts";
 import isUUID from "./src/lib/isUUID.ts";
 import isVariableWidth from "./src/lib/isVariableWidth.ts";
 import isWhitelisted from "./src/lib/isWhitelisted.ts";
@@ -155,6 +156,7 @@ const validator: ValidatorMap = {
   isSlug,
   isSurrogatePair,
   isUpperCase,
+  isURL,
   isUUID,
   isVariableWidth,
   isWhitelisted,

src/lib/isURL.ts

@@ -0,0 +1,166 @@
+import isFQDN from "./isFQDN.ts";
+import isIP from "./isIP.ts";
+import merge from "./util/merge.ts";
+
+/*
+options for isURL method
+
+require_protocol - if set as true isURL will return false if protocol is not present in the URL
+require_valid_protocol - isURL will check if the URL's protocol is present in the protocols option
+protocols - valid protocols can be modified with this option
+require_host - if set as false isURL will not check if host is present in the URL
+allow_protocol_relative_urls - if set as true protocol relative URLs will be allowed
+disallow_auth - if set true wont allow auth data in urls
+host_whiitelist - list of url allowed (can include both string and RegExp)
+host_balcklist - list of url not allowed (can include both string and RegExp)
+
+*/
+
+interface isURLOptions {
+  protocols?: string[];
+  require_tld?: boolean;
+  require_protocol?: boolean;
+  require_host?: boolean;
+  require_valid_protocol?: boolean;
+  allow_underscores?: boolean;
+  allow_trailing_dot?: boolean;
+  allow_protocol_relative_urls?: boolean;
+  host_whitelist?: string[];
+  host_blacklist?: string[];
+  disallow_auth?: boolean;
+}
+
+const defaultURLOptions: isURLOptions = {
+  protocols: ["http", "https", "ftp"],
+  require_tld: true,
+  require_protocol: false,
+  require_host: true,
+  require_valid_protocol: true,
+  allow_underscores: false,
+  allow_trailing_dot: false,
+  allow_protocol_relative_urls: false,
+  host_whitelist: [],
+  host_blacklist: [],
+  disallow_auth: false,
+};
+
+const wrapped_ipv6: RegExp = /^\[([^\]]+)\](?::([0-9]+))?$/;
+
+function checkHost(host: string, matches: (string | RegExp)[]): boolean {
+  for (let i = 0; i < matches.length; i++) {
+    let match: string | RegExp = matches[i];
+    if (host === match || ((match instanceof RegExp) && match.test(host))) {
+      return true;
+    }
+  }
+  return false;
+}
+
+export default function isURL(url: string, options: isURLOptions): boolean {
+  if (!url || url.length >= 2083 || /[\s<>]/.test(url)) {
+    return false;
+  }
+  if (url.indexOf("mailto:") === 0) {
+    return false;
+  }
+  options = merge(options, defaultURLOptions);
+  let protocol: string,
+    auth: string,
+    host: string,
+    hostname: string,
+    port: number,
+    port_str: string | null,
+    split: string[],
+    ipv6: string | null;
+
+  split = url.split("#");
+  url = split.shift()!;
+
+  split = url.split("?");
+  url = split.shift()!;
+
+  split = url.split("://");
+  if (split.length > 1) {
+    protocol = split.shift()!.toLowerCase();
+    if (
+      options.require_valid_protocol &&
+      options.protocols!.indexOf(protocol) === -1
+    ) {
+      return false;
+    }
+  } else if (options.require_protocol) {
+    return false;
+  } else if (url.substr(0, 2) === "//") {
+    if (!options.allow_protocol_relative_urls) {
+      return false;
+    }
+    split[0] = url.substr(2);
+  }
+  url = split.join("://");
+
+  if (url === "") {
+    return false;
+  }
+
+  split = url.split("/");
+  url = split.shift()!;
+
+  if (url === "" && !options.require_host) {
+    return true;
+  }
+
+  split = url.split("@");
+  if (split.length > 1) {
+    if (options.disallow_auth) {
+      return false;
+    }
+    auth = split.shift()!;
+    if (auth.indexOf(":") >= 0 && auth.split(":").length > 2) {
+      return false;
+    }
+  }
+  hostname = split.join("@");
+
+  port_str = null;
+  ipv6 = null;
+  const ipv6_match = hostname.match(wrapped_ipv6);
+  if (ipv6_match) {
+    host = "";
+    ipv6 = ipv6_match[1];
+    port_str = ipv6_match[2] || null;
+  } else {
+    split = hostname.split(":");
+    host = split.shift()!;
+    if (split.length) {
+      port_str = split.join(":");
+    }
+  }
+
+  if (port_str !== null) {
+    port = parseInt(port_str, 10);
+    if (!/^[0-9]+$/.test(port_str) || port <= 0 || port > 65535) {
+      return false;
+    }
+  }
+
+  if (!isIP(host) && !isFQDN(host, options) && (!ipv6 || !isIP(ipv6, 6))) {
+    return false;
+  }
+
+  host = (host || ipv6)!;
+
+  if (
+    options.host_whitelist!.length > 0 &&
+    !checkHost(host, options.host_whitelist!)
+  ) {
+    return false;
+  }
+  if (
+    options.host_blacklist!.length > 0 &&
+    checkHost(host, options.host_blacklist!)
+  ) {
+    return false;
+  }
+
+  return true;
+}