fix(js): consolidate url and account validators

web/utils/validators.ts

@@ -1,7 +1,93 @@
-// eslint-disable-next-line import/prefer-default-export
-export function validateAccount(account) {
-  const a = account.replace(/^@+/, '');
+// to use with <input type="url"> fields, as the default pattern only checks for `:`,
+export const DEFAULT_TEXTFIELD_URL_PATTERN = 'https?://.*';
+
+/**
+ * Determines if a URL is valid
+ * @param {string} url - A URL to validate.
+ * @param {string[]} validProtocols - An array of valid protocols. Defaults to web.
+ * @returns {boolean} - True if the URI is valid, false otherwise.
+ */
+export function isValidUrl(url: string, validProtocols: string[] = ['http:', 'https:']): boolean {
+  try {
+    const validationObject = new URL(url);
+
+    if (
+      validationObject.protocol === '' ||
+      validationObject.hostname === '' ||
+      !validProtocols.includes(validationObject.protocol)
+    ) {
+      return false;
+    }
+  } catch (e) {
+    return false;
+  }
+
+  return true;
+}
+
+/**
+ * Determines if an account is valid by checking for a protocol, username
+ * and server, delimited by a colon. For example: @username:example.com
+ * @param {string} account - An account to validate.
+ * @param {string} protocol - The protocol we expect the account to be using.
+ * @returns {boolean} - True if the account is valid, false otherwise.
+ */
+export function isValidAccount(account: string, protocol: string): boolean {
+  if (account.startsWith('@')) {
+    // eslint-disable-next-line no-param-reassign
+    account = account.slice(1);
+  }
+
+  const components = account.split(/:|@/);
+  const [service, user, host] = components;
+
+  if (service !== protocol) {
+    return false;
+  }
+
+  if (components.length !== 3 || !service || !user || !host) {
+    return false;
+  }
+
+  return true;
+}
+
+/**
+ * Determines if an account is valid by simply checking for a protocol, username
+ * and server, delimited by a colon. For example: @username:example.com
+ * @param {string} account - An account to validate. Example: @me:matrix.org
+ * @returns {boolean} - True if the account is valid, false otherwise.
+ */
+export function isValidMatrixAccount(account: string): boolean {
+  if (account.startsWith('matrix:')) {
+    // eslint-disable-next-line no-param-reassign
+    account = account.slice(7);
+  }
+
+  if (account.startsWith('@')) {
+    // eslint-disable-next-line no-param-reassign
+    account = account.slice(1);
+  }
+
+  const components = account.split(':');
+  const [user, host] = components;
+
+  if (components.length !== 2 || !user || !host) {
+    return false;
+  }
+
+  return true;
+}
+
+/**
+ * Determines if a fediverse account is valid.
+ * For example: @username@example.com
+ * @param {string} account - An account to validate.
+ * @returns {boolean} - True if the account is valid, false otherwise.
+ */
+export function isValidFediverseAccount(account: string): boolean {
+  const sanitized = account.replace(/^@+/, '');
   const regex =
     /^(([^<>()[\]\\.,;:\s@"]+(\.[^<>()[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
-  return regex.test(String(a).toLowerCase());
+  return regex.test(String(sanitized).toLowerCase());
 }