68 lines
2.3 KiB
Python
68 lines
2.3 KiB
Python
from django import forms
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from django.conf import settings
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from django.contrib.admin.widgets import AdminFileWidget
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from django.core.validators import FileExtensionValidator
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from django.db import models
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from django.forms import FileInput, widgets
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from common.validators import MaxFilesizeValidator, readableToInt
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MAX_UPLOAD_SIZE = '312 KB'
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class ImageFileWidget(widgets.ClearableFileInput):
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template_name = 'forms/img-with-preview.html'
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def get_context(self, name, value, attrs):
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context = super().get_context(name, value, attrs)
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context['MEDIA_URL'] = settings.MEDIA_URL
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return context
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class ImgField(forms.FileField):
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widget = ImageFileWidget
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default_validators = [
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FileExtensionValidator(['jpg', 'jpeg', 'png']),
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MaxFilesizeValidator(MAX_UPLOAD_SIZE),
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]
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def widget_attrs(self, widget):
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attrs = super().widget_attrs(widget)
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if isinstance(widget, FileInput) and 'accept' not in widget.attrs:
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attrs.setdefault('accept', 'image/png,image/jpeg') # image/*
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if isinstance(widget, ImageFileWidget):
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attrs.update({
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'data-upload-limit': readableToInt(MAX_UPLOAD_SIZE),
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'data-upload-limit-str': MAX_UPLOAD_SIZE,
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'onchange': 'validate_upload_limit(this)',
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})
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return attrs
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class FileWithImagePreview(models.FileField): # use ImageField to omit Pillow
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__del_image_on_save = False
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def formfield(self, **kwargs):
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if kwargs['widget'] is AdminFileWidget:
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# Override admin widget. Defined by ImgField anyway
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del kwargs['widget']
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return super().formfield(**{'form_class': ImgField, **kwargs})
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def save_form_data(self, instance, data):
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if data is False:
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self.__del_image_on_save = True
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super().save_form_data(instance, data)
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def pre_save(self, model_instance, add):
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if self.__del_image_on_save:
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self.__del_image_on_save = False
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self.deletePreviousImage(model_instance)
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return super().pre_save(model_instance, add)
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def deletePreviousImage(self, instance: models.Model):
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if not instance.pk:
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return
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prev = instance.__class__.objects.get(pk=instance.pk)
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imgField = getattr(prev, self.attname)
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imgField.delete(save=False)
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