@atlaskit/editor-core/src/renderer/utils.ts

A package contains Atlassian editor core functionality

const whitelistedURLPatterns = [
  /^https?:\/\//im,
  /^ftps?:\/\//im,
  /^\//im,
  /^mailto:/im,
  /^skype:/im,
  /^callto:/im,
  /^facetime:/im,
  /^git:/im,
  /^irc6?:/im,
  /^news:/im,
  /^nntp:/im,
  /^feed:/im,
  /^cvs:/im,
  /^svn:/im,
  /^mvn:/im,
  /^ssh:/im,
  /^scp:\/\//im,
  /^sftp:\/\//im,
  /^itms:/im,
  /^notes:/im,
  /^smb:/im,
  /^hipchat:\/\//im,
  /^sourcetree:/im,
  /^urn:/im,
  /^tel:/im,
  /^xmpp:/im,
  /^telnet:/im,
  /^vnc:/im,
  /^rdp:/im,
  /^whatsapp:/im,
  /^slack:/im,
  /^sips?:/im,
  /^magnet:/im,
];

export const isSafeUrl = (url: string): boolean => {
  return whitelistedURLPatterns.some(p => p.test(url.trim()) === true);
};