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Password Strength Meter

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  1. PASSWORD STRENGTH METER (jquery)
  2. /**
  3. * Evaluate the strength of a user's password.
  4. *
  5. * Returns the estimated strength and the relevant output message.
  6. */
  7. Drupal.evaluatePasswordStrength = function(value) {
  8.   var strength = "", msg = "", translate = Drupal.settings.password;
  9.   var hasLetters = value.match(/[a-zA-Z]+/);
  10.   var hasNumbers = value.match(/[0-9]+/);
  11.   var hasPunctuation = value.match(/[^a-zA-Z0-9]+/);
  12.   var hasCasing = value.match(/[a-z]+.*[A-Z]+|[A-Z]+.*[a-z]+/);
  13.   // Check if the password is blank.
  14.   if (!value.length) {
  15.     strength = "";
  16.     msg = "";
  17.   }
  18.   // Check if length is less than 6 characters.
  19.   else if (value.length < 6) {
  20.     strength = "low";
  21.     msg = translate.tooShort;
  22.   }
  23.   // Check if password is the same as the username (convert both to lowercase).
  24.   else if (value.toLowerCase() == translate.username.toLowerCase()) {
  25.     strength  = "low";
  26.     msg = translate.sameAsUsername;
  27.   }
  28.   // Check if it contains letters, numbers, punctuation, and upper/lower case.
  29.   else if (hasLetters && hasNumbers && hasPunctuation && hasCasing) {
  30.     strength = "high";
  31.   }
  32.   // Password is not secure enough so construct the medium-strength message.
  33.   else {
  34.     // Extremely bad passwords still count as low.
  35.     var count = (hasLetters ? 1 : 0) + (hasNumbers ? 1 : 0) + (hasPunctuation ? 1 : 0) + (hasCasing ? 1 : 0);
  36.     strength = count > 1 ? "medium" : "low";
  37.     msg = [];
  38.     if (!hasLetters || !hasCasing) {
  39.       msg.push(translate.addLetters);
  40.     }
  41.     if (!hasNumbers) {
  42.       msg.push(translate.addNumbers);
  43.     }
  44.     if (!hasPunctuation) {
  45.       msg.push(translate.addPunctuation);
  46.     }
  47.     msg = translate.needsMoreVariation +"<ul><li>"+ msg.join("</li><li>") +"</li></ul>";
  48.   }
  49.   return { strength: strength, message: msg };
  50. };

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