Django dynamic Image dimension validator

image_dimension_dynamic_validator.py

""""
When you wanna validate dynamically different image size in Django forms and model forms

""""

# settings.py
DEFAULT_THUMBNAILS_DIMENSION = (
    os.getenv('THUMBNAIL_WIDTH_PX', 300), os.getenv('THUMBNAIL_HEIGHT_PX', 300)
)

# validators.py

# Factory funciton alternative
from django.core.files.images import get_image_dimensions
def validate_image_max_dimension(image_width=None, image_pixel=None):
"""
This is a factory validation and the default dimesion
could be defined by settings with DEFAULT_THUMBNAILS_DIMENSION
or by var env THUMBNAIL_WIDTH_PX and THUMBNAIL_HEIGHT_PX
"""
    def _validate_image_dimension(value):
        if not image_width and not image_pixel:
            width_pixel, height_pixel = settings.DEFAULT_THUMBNAILS_DIMENSION
        else:
            width_pixel = image_width
            height_pixel = image_pixel
        width, height = get_image_dimensions(value)
        if width > width_pixel and height > height_pixel:
            message = u'Max dimension: {} x {} pixels'.format(
                width_pixel, height_pixel
            )
            raise ValidationError(message)
    return _validate_image_dimension

  
# Class alternative
from django.core.files.images import get_image_dimensions

class ValidateImageMaxDimension:
"""
This is a base class and the default dimesion
could be defined by settings with DEFAULT_THUMBNAILS_DIMENSION
or by var env THUMBNAIL_WIDTH_PX and THUMBNAIL_HEIGHT_PX
"""
    width_pixel = None
    height_pixel = None

    def __init__(self, width=None, height=None):
        if width and height:
            self.width_pixel = width
            self.height_pixel = height
        else:
            self.width_pixel, self.height_pixel = settings.DEFAULT_THUMBNAILS_DIMENSION

    def __call__(self, value):
        width, height = get_image_dimensions(value)
        if width > self.width_pixel and height > self.height_pixel:
            message = u'Max dimension: {} x {} pixels'.format(
                self.width_pixel, self.height_pixel
            )
            raise ValidationError(messag)
            


#forms.py
from django import forms
from validators import validate_image_max_dimension, ValidateImageMaxDimension

class Myform(forms.ModelForm):
  image_1 = forms.ImageField(
        validators=[
            validate_image_max_dimension(),
        ],
    )
    image_2 = forms.ImageField(
        validators=[
            ValidateImageMaxDimension(width=600, height=600),
        ],
    )

imported get_image_dimensions from django

typo fixed