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@tochimclaren
Forked from emilio-rst/validators.py
Created August 6, 2019 14:46
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Django validate image dimensions
# coding: utf-8
from django.core.exceptions import ValidationError
from django.core.files.images import get_image_dimensions
from django.utils.translation import ugettext_lazy as _
from django.utils.deconstruct import deconstructible
@deconstructible
class ImageDimensionsValidator:
"""ImageField dimensions validator."""
def __init__(self, width=None, height=None, min_width=None, max_width=None,
min_height=None, max_height=None):
"""
Constructor
Args:
width (int): exact width
height (int): exact height
min_width (int): minimum width
min_height (int): minimum height
max_width (int): maximum width
max_height (int): maximum height
"""
self.width = width
self.height = height
self.min_width = min_width
self.max_width = max_width
self.min_height = min_height
self.max_height = max_height
def __call__(self, image):
w, h = get_image_dimensions(image)
if self.width is not None and w != self.width:
raise ValidationError(_('%s width must be %dpx.') % (image.field.verbose_name.title(), self.width, ))
if self.height is not None and h != self.height:
raise ValidationError(_('%s height must be %dpx.') % (image.field.verbose_name.title(), self.height, ))
if self.min_width is not None and w < self.min_width:
raise ValidationError(_('%s minimum width must be %dpx.') % (image.field.verbose_name.title(), self.min_width, ))
if self.min_height is not None and h < self.min_height:
raise ValidationError(_('%s minimum height must be %dpx.') % (image.field.verbose_name.title(), self.min_height, ))
if self.max_width is not None and w > self.max_width:
raise ValidationError(_('%s maximum width must be %dpx.') % (image.field.verbose_name.title(), self.max_width, ))
if self.max_height is not None and h > self.max_height:
raise ValidationError(_('%s maximum height must be %dpx.') % (image.field.verbose_name.title(), self.max_height, ))
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