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Highly flexible, no magic input validation library

Project description

pycerberus is a framework to check user data thoroughly so that you can protect your application from malicious (or just garbled) input data.

  • Remove stupid code which converts input values: After values are validated, you can work with real Python types instead of strings - e.g. 42 instead of ‘42’, convert database IDs to model objects transparently.

  • Implement custom validation rules: Writing custom validators is straightforward, everything is well documented and pycerberus only uses very little Python magic.

  • Focus on your value-adding application code: Save time by implementing every input validation rule only once, but 100% right instead of implementing a dozen different half-baked solutions.

  • Ready for global business: i18n support (based on GNU gettext) is built in, adding custom translations is easy.

  • Tune it for your needs: You can implement custom behavior in your validators, e.g. fetch translations from a database instead of using gettext or define custom translations for built-in validators.

  • Use it wherever you like: pycerberus is used in a SMTP server, trac macros as well as web applications - there are no dependencies on a specific context like web development.


0.6 (24.11.2014)

  • stop using 2to3 for Python 3 compatibility and use exactly the same source for all Python versions.

  • drop support for Python 2.4 and 2.5

  • bug fix: detect validator message keys correctly also when messages are specified during validator initialization

0.5 (05.08.2013)

  • ‘allow_additional_parameters’ can now be specified in the schema constructor directly as well as a parameter for a declarative schema

  • new ForEach validator to validate a list of items with the same validator

  • InvalidDataErrors can return a list of errors using ‘.errors()’.

  • added ‘min_length’, ‘max_length’ parameters when instantiating a StringValidator

  • All validator messages can be overridden during instantiation by specifying messages attribute,

  • new OneOf validator to validate that a value is in a given list of allowed values

  • added constructor parameter ‘filter_unvalidated_parameters’ (default True) for SchemaValidators to pass unvalidated parameters instead of removing them

  • InvalidDataErrors can “unpack” their errors so that an ordinary dict is used as container for sub-errors (instead of another InvalidDataError with an error_dict)

  • new BooleanCheckbox validator to validate typical HTML checkboxes

  • new API method for all validators: ‘.copy()’ returns a clone of the validator

  • new MatchingFields form validator (typically used to verify a password confirmation field)

  • new AgreeToConditionsCheckbox validator which works like a BooleanCheckbox but enforces a trueish value

  • EmailAddressValidator accepts also ‘-’ and ‘+’ characters in local part

API changes:

  • BaseValidator.error() is deprecated now as the name does not really reflect that the method also raised the exception. I added a new method named ‘.raise_error()’ which behaves exactly like the old .error() method. In addition there is a new method ‘.exception()’ which only creates an exception instance.

  • IntegerValidator now treats ‘’ and None as empty

  • BaseValidator.to_string() changed to BaseValidator.revert_conversion() which reflects the actual purpose better. Validators are not required to return a string anymore.

0.4.2 (05.05.2011)

  • More fixes for source distribution because of missing files in tar.gz

0.4.1 (16.04.2011)

  • Fix source distribution ( were not included)

0.4 (13.04.2011)

  • pycerberus now supports Python 3!

  • Fix installation/egg generation without babel

  • Added a schema which can parse positional parameters from a string into a dict before processing the data like a normal schema would do

0.3.3 (04.07.2010)

  • Fix installation issue: pycerberus is actually not zip-safe

0.3.2 (05.06.2010)

  • Fix egg file generation: Include all necessary packages in eggs

  • added babel support to

  • updated pot file and completed German translation

  • fix exception if translations for preferred locale are not available (fall back to english messages)

0.3.1 (07.04.2010)

  • Fixed bug due to duplicated message in DomainNameValidator/EmailAddressValidator

  • Validator can now strip inputs (False by default)

  • StringValidator now also treats ‘’ as empty value (as well as None)

0.3 (27.03.2010)

  • Python 2.3 compatibility

  • Schema can raise error if unknown items are processed

  • Basic domain name validator

  • Basic email address validator

0.2 (16.03.2010)

  • You now can declare custom messages as a class-level dict

  • Added interface to retrieve error details from InvalidDataErrors

  • Added validation schemas to validate a set of values (typically a web form). Schemas can also inherit from other schemas to avoid code duplication.

  • Validators try to make thread-safety violations obvious

  • Nicer API to retrieve error details from an InvalidDataError

0.1 (30.01.2010)

  • initial release

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