Use shortpixel to compress and resize images

attachments/models.py

@@ -1,6 +1,9 @@
+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 PIL import Image
@@ -15,24 +18,63 @@ class Attachment(models.Model):
         if self.processed_file:
             return super().save(*args, **kwargs)
 
+        if self.id is None:
+            super().save(*args, **kwargs)
         try:
             image = Image.open(self.original_file.path)
         except IOError:
-            return self.save(*args, **kwargs)
-        max_width = 640
-        if image.width > max_width:
-            ratio = image.height / image.width
-            height = round(max_width * ratio)
-            output = image.resize((max_width, height))
-        else:
-            output = image.copy()
-        current_path = Path(image.filename)
+            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,
+            "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 + "-resized" + current_path.suffix)
-        output.save(temp_path)
+        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)

blog/settings.py

@@ -70,6 +70,7 @@ INSTALLED_APPS = [
     "articles",
     "attachments",
     "anymail",
+    "django_cleanup.apps.CleanupConfig",
 ]
 
 MIDDLEWARE = [
@@ -175,3 +176,5 @@ BLOG = {
     "description": "My take on tech-related subjects (but not only)",
     "base_url": os.getenv("BLOG_BASE_URL", "https://gabnotes.org/"),
 }
+
+SHORTPIXEL_API_KEY = os.getenv("SHORTPIXEL_API_KEY")

requirements.txt

@@ -4,3 +4,5 @@ gunicorn==20.0.4
 Pygments==2.6.1
 django-anymail[mailgun]==7.2.1
 pillow==7.2.0
+django-cleanup==5.0.0
+requests==2.24.0