PyValitron

PyValitron is a light-weight python inputs validation library.

Installation

To install PyValitron run this command:

pip3 install pyvalitron

Usage

After installing the library, Read the following usage criteria:

Validate Values:

To validate a list of values:

from pyvalitron.form import Form

form = Form({
    'test_field1': {
        'value': 'Hello World',
        'validate': {
            'length_between': {
                'param': [1, 12],
                'error': 'Input lenght must be between 1 and 12 characters'
            }
        }
    },
    'test_field2': {
        'value': 'Hello World',
        'validate': {
            'length_between': {
                'param': [1, 9],
                'error': 'Input lenght must be between 1 and 9 characters'
            }
        }
    }
})
form.process()
errors = form.get_errors()
print(errors['test_field2'])   # Input lenght must be between 1 and 9 characters

Sanitize Values:

To sanitize a list of values:

from __future__ import print_function
from pyvalitron.form import Form


form = Form({
    'test_field': {
        'value': 'Hello& W"or"ld<br>.',
        'sanitize': {
            'escape': {}
        }
    }
})
form.process()
inputs = form.get_inputs()
print(inputs['test_field']) # {'is_exact': False, 'svalue': 'Hello&amp; W&quot;or&quot;ld&lt;br&gt;.', 'sanitize': {'escape': {}}, 'value': 'Hello& W"or"ld<br>.'}
print(inputs['test_field']['is_exact']) # False
print(inputs['test_field']['svalue']) # Hello&amp; W&quot;or&quot;ld&lt;br&gt;.
print(inputs['test_field']['value']) # Hello& W"or"ld<br>.

from __future__ import print_function
from pyvalitron.form import Form


form = Form({
    'test_field': {
        'value': 'Hello World.',
        'sanitize': {
            'escape': {}
        }
    }
})
form.process()
inputs = form.get_inputs()
print(inputs['test_field']) # {'is_exact': True, 'svalue': 'Hello World.', 'sanitize': {'escape': {}}, 'value': 'Hello World.'}
print(inputs['test_field']['is_exact']) # True
print(inputs['test_field']['svalue']) # Hello World.
print(inputs['test_field']['value']) # Hello World.

Validate & Sanitize Values:

To validate and sanitize a list of values:

from __future__ import print_function
from pyvalitron.form import Form


form = Form({
    'test_field': {
        'value': 'hello@clivern.com',
        'sanitize': {
            'escape': {}
        },
        'validate': {
            'email': {
                'error': 'Please provide a valid email.'
            }
        }
    }
})
form.process()
inputs = form.get_inputs()
errors = form.get_errors()
print(errors) # {'test_field': []}
print(errors['test_field']) # []
print(inputs['test_field']) # {'status': True, 'is_exact': True, 'value': 'hello@clivern.com', 'sanitize': {'escape': {}}, 'svalue': 'hello@clivern.com', 'validate': {'email': {'error': 'Please provide a valid email.'}}}
print(inputs['test_field']['status']) # True
print(inputs['test_field']['is_exact']) # True
print(inputs['test_field']['value']) # hello@clivern.com
print(inputs['test_field']['svalue']) # hello@clivern.com

from __future__ import print_function
from pyvalitron.form import Form


form = Form({
    'test_field': {
        'value': 'hello@cliv@ern.com',
        'sanitize': {
            'escape': {}
        },
        'validate': {
            'email': {
                'error': 'Please provide a valid email.'
            }
        }
    }
})
form.process()
inputs = form.get_inputs()
errors = form.get_errors()
print(errors) # {'test_field': ['Please provide a valid email.']}
print(errors['test_field']) # ['Please provide a valid email.']
print(inputs['test_field']) # {'status': False, 'is_exact': True, 'value': 'hello@cliv@ern.com', 'sanitize': {'escape': {}}, 'svalue': 'hello@cliv@ern.com', 'validate': {'email': {'error': 'Please provide a valid email.'}}}
print(inputs['test_field']['status']) # False
print(inputs['test_field']['is_exact']) # True
print(inputs['test_field']['value']) # hello@cliv@ern.com
print(inputs['test_field']['svalue']) # hello@cliv@ern.com

Using With Frameworks:

Flask Framework

from flask import Flask
from flask import request
from pyvalitron.form import Form


app = Flask(__name__)

@app.route("/")
def hello():
    form = Form({
        'test_field1': {
            'value': request.args.get('test_field1'),
            'validate': {
                'length_between': {
                    'param': [1, 12],
                    'error': 'Input lenght must be between 1 and 12 characters'
                }
            }
        },
        'test_field2': {
            'value': request.args.get('test_field2'),
            'validate': {
                'length_between': {
                    'param': [1, 9],
                    'error': 'Input lenght must be between 1 and 9 characters'
                }
            }
        }
    }, 'values')
    form.process()
    errors = form.get_errors()
    if 'Input lenght must be between 1 and 9 characters' in errors['test_field2']:
        return 'error'
    else:
        return 'success'

if __name__ == "__main__":
    app.run(debug=True)

Validators List:

Here is a list of all available validators:

• empty: Validate if input or a value is empty.
• not_empty: Validate if input or a value is not empty.
• length_between: Validate if input or a value length is between provided lengths. It requires two parameters [from_length, to_length] like [1, 13].
• min_length: Validate if input or a value min lenght is like provided one. It requires one parameter [min_length] like [1].
• max_length: Validate if input or a value max lenght is like provided one. It requires one parameter [max_length] like [12].
• exact_length: Validate if input or a value lenght is equal to provided one. It requires one parameter [exact_length] like [9].
• greater_than: Validate if input or a value is greater than provided one. It requires one parameter [number] like [5].
• greater_than_equal: Validate if input or a value is greater than or equal provided one. It requires one parameter [number] like [4].
• less_than: Validate if input or a value is less than provided one. It requires one parameter [number] like [5].
• less_than_equal: Validate if input or a value is less than or equal provided one. It requires one parameter [number] like [5].
• equal: Validate if input or a value is equal to provided one. It requires one parameter [number] like [5].
• same_as: Validate if input or a value is same as provided one. It requires one parameter [text] like ['Hello World']
• any_of: Validate if input or a value is any of the provided list. It requires one parameter [[options]] like [1,5,'text'].
• all_of: Validate if input or a value is all of the provided list. It requires one parameter [[options]] like [1,5,'text'].
• none_of: Validate if input or a value is none of the provided list. It requires one parameter [[options]] like [1,5,'text'].
• alpha: Validate if input or a value is alphabetical.
• alpha_numeric: Validate if input or a value is alphanumeric.
• digit: Validate if input or a value is digits.
• email: Validate if input or a value is email.
• emails: Validate if input or a value is a list of emails. It requires one parameter [separator] like [','].
• url: Validate if input or a value is a URL. It requires one parameter (a list of protocols) [[protocols]] like [['http', 'https']].
• ip: Validate if input or a value is IP. It requires one parameter (a list of formats) [[formats]] like ['ipv4']
• ipv4: Validate if input or a value is IPv4.
• uuid: Validate if input or a value is universally unique identifier (UUID)
• matches: Validate if input or a value matches provided regex. It requires one parameter [regex] like [r'^[_a-z0-9-]+$'].

Sanitizers List

Here is a list of all available sanitizers:

• strip: Strip the input value. It accepts one parameter [[chars]] like [[',', '.', '\s']].
• lstrip: Left strip the input value. It accepts one parameter [[chars]] like [[',', '.', '\s']].
• rstrip: Right strip the input value. It accepts one parameter [[chars]] like [[',', '.', '\s']].
• escape: Escape the input value to prevent evil scripts. It accepts one parameter (a list of chars to escape). currently it support these characters ['&', '"', '\'', '>', '<'].

Custom Validators

To define a new validator:

from pyvalitron.validator import Validator
from pyvalitron.form import Form


class MyValidator(Validator):

    def username(self):
        if not isinstance(self._input, (str)):
            return False
        current_input = self._input.strip()
        if len(current_input) > 5 and current_input.isalpha():
            return True
        return False

    def otherrule(self):
        return True

    #...and so one


form = Form()
form.add_validator(MyValidator())
form.add_inputs({
    'user_name': {
        'value': '',
        'validate': {
            'username': {
                'error': 'Invalid Username'
            }
        }
    }
})
form.process()
errors = form.get_errors() #{'user_name': ['Invalid Username']}

Custom Sanitizers

To define a new sanitizer:

from __future__ import print_function
from pyvalitron.sanitizer import Sanitizer
from pyvalitron.form import Form

class MySanitizer(Sanitizer):

    def clear_spaces(self):
        if not isinstance(self._input, (str)):
            self._sinput = str(self._input)
        else:
            self._sinput = self._input

        self._sinput = self._sinput.replace(" ", "")
        return self._sinput

    def lower_case(self):
        if not isinstance(self._input, (str)):
            self._sinput = str(self._input)
        else:
            self._sinput = self._input
        self._sinput = self._sinput.lower()
        return self._sinput

form = Form({
    'test_field': {
        'value': 'Hello World',
        'sanitize': {
            'clear_spaces':{},
            'lower_case': {}
        }
    }
}, 'values')
form.add_sanitizer(MySanitizer())
form.process()
inputs = form.get_inputs()
print(inputs['test_field']['svalue']) #helloworld

Misc

Changelog

Version 1.1.3:

Fix issue with validation extensions.

Version 1.1.2:

Fix import issues.

Version 1.1.1:

New Validation Rules.
Add python lint check.

Version 1.0.0:

Initial Release.

Acknowledgements

© 2019, Silverback. Released under MIT License.

PyValitron is authored and maintained by @silverbackhq.