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import timeout_decorator |
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from django.db import models |
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from django.core.exceptions import ValidationError |
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from django.core.validators import RegexValidator |
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from jsonfield import JSONField |
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import re # regex |
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from django.core.validators import validate_email |
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def get_validator_by_name(name): |
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""" |
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For given validator name, returns associated functions array: |
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validator = { validate_fields: vf, validate_input: vi } |
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Where: |
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- vf(fields) |
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Raises a ValidationError if given fields are not valid for this validator |
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- vi(fields, user_input) |
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Throws a ValidationError if given input is not valid for this validator |
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Returns None if there is no validator matching that name. |
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""" |
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# Validators functions |
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def text_validate_fields(fields): |
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# TODO: Is it safe to call re.compile with user input ? Possible infinite loops ... ? |
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try: |
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re.compile(fields['regex']) |
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except re.error: |
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raise ValidationError(fields['message'] + " (invalid Regex syntax)") |
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# Protection against Evil Regex. Only 50ms to evaluate regex - should be enough. |
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@timeout_decorator.timeout(0.05, use_signals=False) |
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def regex_check_timeout(regex, error_message, input): |
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try: |
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RegexValidator(regex, error_message)(input) |
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except re.error: # Should not happen ... |
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raise ValidationError("Invalid validator for this field.") |
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def text_validate_input(fields, input): |
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if (fields['regex']): |
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try: |
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regex_check_timeout(fields['regex'], fields['message'], input) |
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except timeout_decorator.TimeoutError: |
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raise ValidationError(fields['message']) |
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# Validators map |
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validators_map = { |
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Validator.VALIDATOR_NONE: { |
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'validate_fields': lambda f: True, |
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'validate_input': lambda f,i: True, |
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}, |
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Validator.VALIDATOR_TEXT: { |
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'validate_fields': text_validate_fields, |
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'validate_input': text_validate_input |
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}, |
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# TODO: Register validators here |
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} |
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# Find matching validator |
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try: |
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return validators_map[name] |
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except KeyError: |
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return None |
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def validate_validator_fields(validator, fields): |
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v = get_validator_by_name(validator) |
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v['validate_fields'](fields) |
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def are_validator_fields_valid(validator, fields): |
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try: |
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validate_validator_fields(validator, fields) |
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return True |
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except ValidationError: |
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return False |
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def validate_validator_input(validator, validator_values, value): |
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v = get_validator_by_name(validator) |
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v['validate_input'](validator_values, value) |
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def is_validator_input_valid(validator, validator_values, value): |
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try: |
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validate_validator_input(validator, validator_values, value) |
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return True |
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except ValidationError: |
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return False |
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class Validator(models.Model): |
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class Meta: |
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pass |
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VALIDATOR_TEXT = 'text' |
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VALIDATOR_NONE = 'none' |
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VALIDATOR_HTML_CHOICES = ( |
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(VALIDATOR_TEXT, 'Text'), |
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(VALIDATOR_NONE, 'None') |
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) |
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# Displayed validator name |
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display_name = models.CharField(max_length=255) |
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# HTML name (<input type="html_name">) |
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html_name = models.CharField(max_length=255, |
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choices=VALIDATOR_HTML_CHOICES, |
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default=VALIDATOR_NONE, |
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primary_key=True) |
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# Serialized JSON array (fieldName => fieldDescription) |
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values = JSONField() |
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def __str__(self): |
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return "Validator \"%s\" (\"%s\" with values=\"%s\")" % (self.display_name, self.html_name, self.values) |
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def validate_fields(self, fields): |
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return validate_validator_fields(self.html_name, fields) |
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def validate_input(self, validator_values, client_input): |
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return validate_validator_input(self.html_name, validator_values, client_input) |
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ProjetSigma /
backend
