Replace custom OpenPGP packet parsing with pysequoia

pulpcore/app/models/openpgp.py

@@ -3,8 +3,9 @@
 from aiohttp.web_response import Response
 from django.db import models
 from django.utils import timezone
+from pysequoia import Cert
+
 from pulpcore.app.models import AutoAddObjPermsMixin, Content, Distribution, Repository
-from pulpcore.app.openpgp import wrap_armor
 from pulpcore.app.util import get_domain_pk, gpg_verify
 
 
@@ -61,7 +62,7 @@ def represent(self, repository_version=None):
             data += public_subkey.packet()
             for signature in public_subkey.openpgp_signatures.filter(**content_filter):
                 data += signature.packet()
-        return wrap_armor(data)
+        return str(Cert.from_bytes(data)).strip()
 
     class Meta:
         default_related_name = "%(app_label)s_%(model_name)s"
@@ -127,11 +128,11 @@ class OpenPGPSignature(_OpenPGPContent):
 
     sha256 = models.CharField(max_length=128)
     signature_type = models.PositiveSmallIntegerField()
-    created = models.DateTimeField()  # 2
-    expiration_time = models.DurationField(null=True)  # 3
-    key_expiration_time = models.DurationField(null=True)  # 9
-    issuer = models.CharField(max_length=16, null=True)  # 16
-    signers_user_id = models.CharField(null=True)  # 28
+    created = models.DateTimeField()
+    expiration_time = models.DurationField(null=True)
+    key_expiration_time = models.DurationField(null=True)
+    issuer = models.CharField(max_length=16, null=True)
+    signers_user_id = models.CharField(null=True)
     signed_content = models.ForeignKey(
         Content, related_name="openpgp_signatures", on_delete=models.PROTECT
     )