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import mimetypes
from os.path import splitext
from django.core.exceptions import ValidationError
from django.core.files.images import get_image_dimensions
from django.template.defaultfilters import filesizeformat
from django.utils.deconstruct import deconstructible
from django.utils.translation import ugettext_lazy as _
@deconstructible
class ImageDimensionsValidator:
"""
ImageField dimensions validator.
from https://gist.github.com/emilio-rst/4f81ea2718736a6aaf9bdb64d5f2ea6c
"""
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(_("Width must be %dpx.") % (self.width,))
if self.height is not None and h != self.height:
raise ValidationError(_("Height must be %dpx.") % (self.height,))
if self.min_width is not None and w < self.min_width:
raise ValidationError(_("Minimum width must be %dpx.") % (self.min_width,))
if self.min_height is not None and h < self.min_height:
raise ValidationError(
_("Minimum height must be %dpx.") % (self.min_height,)
)
if self.max_width is not None and w > self.max_width:
raise ValidationError(_("Maximum width must be %dpx.") % (self.max_width,))
if self.max_height is not None and h > self.max_height:
raise ValidationError(
_("Maximum height must be %dpx.") % (self.max_height,)
)
@deconstructible
class FileValidator(object):
"""
Taken from https://gist.github.com/jrosebr1/2140738
Validator for files, checking the size, extension and mimetype.
Initialization parameters:
allowed_extensions: iterable with allowed file extensions
ie. ('txt', 'doc')
allowd_mimetypes: iterable with allowed mimetypes
ie. ('image/png', )
min_size: minimum number of bytes allowed
ie. 100
max_size: maximum number of bytes allowed
ie. 24*1024*1024 for 24 MB
Usage example::
MyModel(models.Model):
myfile = FileField(validators=FileValidator(max_size=24*1024*1024), ...)
"""
extension_message = _(
"Extension '%(extension)s' not allowed. Allowed extensions are: '%(allowed_extensions)s.'"
)
mime_message = _(
"MIME type '%(mimetype)s' is not valid. Allowed types are: %(allowed_mimetypes)s."
)
min_size_message = _(
"The current file %(size)s, which is too small. The minumum file size is %(allowed_size)s."
)
max_size_message = _(
"The current file %(size)s, which is too large. The maximum file size is %(allowed_size)s."
)
def __init__(self, *args, **kwargs):
self.allowed_extensions = kwargs.pop("allowed_extensions", None)
self.allowed_mimetypes = kwargs.pop("allowed_mimetypes", None)
self.min_size = kwargs.pop("min_size", 0)
self.max_size = kwargs.pop("max_size", None)
def __call__(self, value):
"""
Check the extension, content type and file size.
"""
# Check the extension
ext = splitext(value.name)[1][1:].lower()
if self.allowed_extensions and ext not in self.allowed_extensions:
message = self.extension_message % {
"extension": ext,
"allowed_extensions": ", ".join(self.allowed_extensions),
}
raise ValidationError(message)
# Check the content type
mimetype = mimetypes.guess_type(value.name)[0]
if self.allowed_mimetypes and mimetype not in self.allowed_mimetypes:
message = self.mime_message % {
"mimetype": mimetype,
"allowed_mimetypes": ", ".join(self.allowed_mimetypes),
}
raise ValidationError(message)
# Check the file size
filesize = len(value)
if self.max_size and filesize > self.max_size:
message = self.max_size_message % {
"size": filesizeformat(filesize),
"allowed_size": filesizeformat(self.max_size),
}
raise ValidationError(message)
elif filesize < self.min_size:
message = self.min_size_message % {
"size": filesizeformat(filesize),
"allowed_size": filesizeformat(self.min_size),
}
raise ValidationError(message)