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PhabricatorCommonPasswords.php
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			<?php

			/**
			* Check if a password is extremely common. Preventing use of the most common
			* passwords is an attempt to mitigate slow botnet attacks against an entire
			* userbase. See T4143 for discussion.
			*
			* @task common Checking Common Passwords
			*/
			final class PhabricatorCommonPasswords extends Phobject {


			/* -( Checking Common Passwords )------------------------------------------ */


			/**
			* Check if a password is extremely common.
			*
			* @param string $password Password to test.
			* @return bool True if the password is pathologically weak.
			*
			* @task common
			*/
			public static function isCommonPassword($password) {
			static $list;
			if ($list === null) {
			$list = self::loadWordlist();
			}

			return isset($list[strtolower($password)]);
			}


			/**
			* Load the common password wordlist.
			*
			* @return map<string, bool> Map of common passwords.
			*
			* @task common
			*/
			private static function loadWordlist() {
			$root = dirname(phutil_get_library_root('phabricator'));
			$file = $root.'/externals/wordlist/password.lst';
			$data = Filesystem::readFile($file);

			$words = phutil_split_lines($data, $retain_endings = false);

			$map = array();
			foreach ($words as $key => $word) {
			// The wordlist file has some comments at the top, strip those out.
			if (preg_match('/^#!comment:/', $word)) {
			continue;
			}
			$map[strtolower($word)] = true;
			}

			// Add in some application-specific passwords.
			$map += array(
			'phabricator' => true,
			'phab' => true,
			'devtools' => true,
			'differential' => true,
			'codereview' => true,
			'review' => true,
			);

			return $map;
			}

			}