Add remove_remote_user_preview_images command

bookwyrm/management/commands/remove_remote_user_preview_images.py

@@ -0,0 +1,40 @@
+""" Generate preview images """
+from django.core.management.base import BaseCommand
+from django.db.models import Q
+
+from bookwyrm import models, preview_images
+
+
+# pylint: disable=line-too-long
+class Command(BaseCommand):
+    """Remove preview images for remote users"""
+
+    help = "Remove preview images for remote users"
+
+    # pylint: disable=no-self-use,unused-argument
+    def handle(self, *args, **options):
+        """generate preview images"""
+        self.stdout.write(
+            "   | Hello! I will be removing preview images from remote users."
+        )
+        self.stdout.write(
+            "🧑‍🚒 ⎨ This might take quite long if your instance has a lot of remote users."
+        )
+        self.stdout.write("   | ✧ Thank you for your patience ✧")
+
+        users = models.User.objects.filter(local=False).exclude(Q(preview_image='')|Q(preview_image=None))
+
+        if len(users) > 0:
+            self.stdout.write(
+                f"   → Remote user preview images ({len(users)}): ", ending=""
+            )
+            for user in users:
+                preview_images.remove_user_preview_image_task.delay(user.id)
+                self.stdout.write(".", ending="")
+            self.stdout.write(" OK 🖼")
+        else:
+            self.stdout.write(
+                f"   | There was no remote users with preview images."
+            )
+
+        self.stdout.write("🧑‍🚒 ⎨ I’m all done! ✧ Enjoy ✧")