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python-blog/attachments/models.py

107 lines
3.3 KiB
Python

import json
import tempfile
from pathlib import Path
import requests
from django.conf import settings
from django.core.files import File
from django.db import models
from django.db.models.fields.files import FieldFile
from PIL import Image
from articles.utils import build_full_absolute_url
class AbsoluteUrlFieldFile(FieldFile):
def get_full_absolute_url(self, request):
return build_full_absolute_url(request, self.url)
class AbsoluteUrlFileField(models.FileField):
attr_class = AbsoluteUrlFieldFile
class AttachmentManager(models.Manager):
def get_open_graph_image(self):
return self.filter(open_graph_image=True).first()
class Attachment(models.Model):
description = models.CharField(max_length=500)
original_file = AbsoluteUrlFileField()
processed_file = AbsoluteUrlFileField(blank=True, null=True)
open_graph_image = models.BooleanField(blank=True, default=False)
objects = AttachmentManager()
class Meta:
ordering = ["description"]
def __str__(self):
return f"{self.description} ({self.original_file.name})"
def save(self, *args, **kwargs):
if self.processed_file:
return super().save(*args, **kwargs)
if self.id is None:
super().save(*args, **kwargs)
try:
Image.open(self.original_file.path)
except IOError:
return super().save(*args, **kwargs)
# Submit job to shortpixel
base_data = {
"key": settings.SHORTPIXEL_API_KEY,
"plugin_version": "gabno",
"wait": 20,
}
post_data = {
"lossy": 1,
"resize": 3,
"resize_width": 640,
"resize_height": 10000,
"keep_exif": 1,
"file_paths": json.dumps(
[f"{self.original_file.name}:{self.original_file.path}"]
),
}
data = {**base_data, **post_data}
url = "https://api.shortpixel.com/v2/post-reducer.php"
with open(self.original_file.path, "rb") as original_file:
response = requests.post(
url=url, data=data, files={self.original_file.name: original_file}
)
res = response.json()
res_data = res[0]
# Loop until it's done
post_data = {
"key": settings.SHORTPIXEL_API_KEY,
"plugin_version": "gabno",
"wait": 20,
"file_urls": json.dumps([res_data["OriginalURL"]]),
}
check_data = {**base_data, **post_data}
while res_data["Status"]["Code"] == "1":
response = requests.post(url=url, data=check_data)
res_data = response.json()[0]
# Download image
current_path = Path(self.original_file.path)
temp_dir = Path(tempfile.mkdtemp())
temp_path = temp_dir / (current_path.stem + "-processed" + current_path.suffix)
img = requests.get(res_data["LossyURL"], stream=True)
with open(temp_path, "wb") as temp_file:
for chunk in img:
temp_file.write(chunk)
# Link it to our model
with open(temp_path, "rb") as output_file:
f = File(output_file)
self.processed_file.save(temp_path.name, f, save=False)
temp_path.unlink()
temp_dir.rmdir()
return super().save(*args, **kwargs)