Class: NotPwnedValidator

Inherits:
ActiveModel::EachValidator
  • Object
show all
Defined in:
lib/pwned/not_pwned_validator.rb

Overview

An ActiveModel validator to check passwords against the Pwned Passwords API.

Examples:

Validate a password on a User model with the default options.

class User < ApplicationRecord
  validates :password, not_pwned: true
end

Validate a password on a User model with a custom error message.

class User < ApplicationRecord
  validates :password, not_pwned: { message: "has been pwned %{count} times" }
end

Validate a password on a User model that allows the password to have been breached once.

class User < ApplicationRecord
  validates :password, not_pwned: { threshold: 1 }
end

Validate a password on a User model, handling API errors in various ways

class User < ApplicationRecord
  # The record is marked as invalid on network errors
  # (error message "could not be verified against the past data breaches".)
  validates :password, not_pwned: { on_error: :invalid }

  # The record is marked as invalid on network errors with custom error.
  validates :password, not_pwned: { on_error: :invalid, error_message: "might be pwned" }

  # An error is raised on network errors.
  # This means that `record.valid?` will raise `Pwned::Error`.
  # Not recommended to use in production.
  validates :password, not_pwned: { on_error: :raise_error }

  # Call custom proc on error. For example, capture errors in Sentry,
  # but do not mark the record as invalid.
  validates :password, not_pwned: {
    on_error: ->(record, error) { Raven.capture_exception(error) }
  }
end

Since:

  • 1.2.0

Direct Known Subclasses

PwnedValidator

Constant Summary collapse

DEFAULT_ON_ERROR =

The default behaviour of this validator in the case of an API failure. The default will mean that if the API fails the object will not be marked invalid.

Since:

  • 1.2.0

:valid
DEFAULT_THRESHOLD =

The default threshold for whether a breach is considered pwned. The default is 0, so any password that appears in a breach will mark the record as invalid.

Since:

  • 1.2.0

0

Instance Method Summary collapse

Instance Method Details

#validate_each(record, attribute, value) ⇒ Object

Validates the value against the Pwned Passwords API. If the pwned_count is higher than the optional threshold then the record is marked as invalid.

In the case of an API error the validator will either mark the record as valid or invalid. Alternatively it will run an associated proc or re-raise the original error.

The validation will short circuit and return with no errors added if the password is blank. The Pwned::Password initializer expects the password to be a string and will throw a TypeError if it is nil. Also, technically the empty string is not a password that is reported to be found in data breaches, so returns false, short circuiting that using value.blank? saves us a trip to the API.

Parameters:

  • record (ActiveModel::Validations) —

    The object being validated

  • attribute (Symbol) —

    The attribute on the record that is currently being validated.

  • value (String) —

    The value of the attribute on the record that is the subject of the validation

Since:

  • 1.2.0



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# File 'lib/pwned/not_pwned_validator.rb', line 77

def validate_each(record, attribute, value)
  return if value.blank?
  begin
    pwned_check = Pwned::Password.new(value, request_options)
    if pwned_check.pwned_count > threshold
      record.errors.add(attribute, :not_pwned, options.merge(count: pwned_check.pwned_count))
    end
  rescue Pwned::Error => error
    case on_error
    when :invalid
      record.errors.add(attribute, :pwned_error, options.merge(message: options[:error_message]))
    when :valid
      # Do nothing, consider the record valid
    when Proc
      on_error.call(record, error)
    else
      raise
    end
  end
end