from os import path as os_path from secrets import token_urlsafe from django_prometheus.models import ExportModelOperationsMixin from django.db import models from django.core.files.uploadedfile import InMemoryUploadedFile from django.contrib.auth.models import User from monero.address import address from PIL import Image, ExifTags from io import BytesIO from core.monero import AuctionDaemon from core.validators import address_is_valid_monero class Item(ExportModelOperationsMixin('item'), models.Model): owner = models.ForeignKey(User, related_name='owner', on_delete=models.CASCADE) name = models.CharField(max_length=100) list_date = models.DateTimeField(auto_now_add=True) last_updated = models.DateTimeField(auto_now=True) description = models.TextField(max_length=500) ask_price_xmr = models.FloatField() available = models.BooleanField(default=True) payout_address = models.CharField(max_length=100, validators=[address_is_valid_monero]) whereabouts = models.CharField(max_length=100) def __str__(self): return f"{self.id} - {self.owner} - {self.name}" class ItemImage(ExportModelOperationsMixin('item_image'), models.Model): item = models.ForeignKey(Item, related_name='images', on_delete=models.CASCADE) image = models.ImageField(upload_to='%Y/%m/%d') thumbnail = models.ImageField(upload_to='%Y/%m/%d') def save(self, *args, **kwargs): self.correct_image() super(ItemImage, self).save(*args, **kwargs) def correct_image(self): try: # Open image and set some variables img = Image.open(self.image) img_format = img.format max_size = (800, 800) thumb_size = (150, 150) file_ext = os_path.splitext(self.image.name)[1] random_str = token_urlsafe(12) img_name = f'{self.item.id}-{random_str}.%s{file_ext}' img_bytes = BytesIO() thumb_bytes = BytesIO() # If image contains exif check for orientation and rotate for orientation in ExifTags.TAGS.keys(): if ExifTags.TAGS[orientation] == 'Orientation': img_exif = img._getexif() if img_exif: if orientation in img_exif: image_orientation = img_exif[orientation] if image_orientation == 3: img = img.rotate(180, expand=True) if image_orientation == 6: img = img.rotate(-90, expand=True) if image_orientation == 8: img = img.rotate(90, expand=True) # Store a copy of the image for thumbnail thumb = img.copy() # TODO - task this and just present page without until it's done # Correct the image size to safe maximums img.thumbnail(max_size, Image.ANTIALIAS) img.save(img_bytes, format=img_format, quality=80) self.image = InMemoryUploadedFile( img_bytes, 'ImageField', img_name % 'full', self.image.file.content_type, img.size, self.image.file.charset ) # Create thumbnail from image thumb.thumbnail(thumb_size, Image.ANTIALIAS) thumb.save(thumb_bytes, format=img_format, quality=80) self.thumbnail = InMemoryUploadedFile( thumb_bytes, 'ImageField', img_name % 'thumbnail', self.image.file.content_type, img.size, self.image.file.charset ) thumb.close() img.close() except: raise Exception('Unable to correct image size') def __str__(self): return f'{self.id} - {self.item.name} - {self.id}'