Add created_datetime to schema1 format

image/docker/schema1.py

@@ -11,6 +11,8 @@ import logging
 from collections import namedtuple, OrderedDict
 from datetime import datetime
 
+import dateutil.parser
+
 from jsonschema import validate as validate_schema, ValidationError
 
 from jwkest.jws import SIGNER_ALGS, keyrep
@@ -268,6 +270,18 @@ class DockerSchema1Manifest(ManifestInterface):
   def leaf_layer(self):
     return self.layers[-1]
 
+  @property
+  def created_datetime(self):
+    created_datetime_str = self.leaf_layer.v1_metadata.created
+    if created_datetime_str is None:
+      return None
+
+    try:
+      return dateutil.parser.parse(created_datetime_str).replace(tzinfo=None)
+    except:
+      # parse raises different exceptions, so we cannot use a specific kind of handler here.
+      return None
+
   @property
   def layers(self):
     if self._layers is None:

image/docker/test/test_schema1.py

@@ -78,6 +78,7 @@ def test_valid_manifest():
   assert manifest.layers[1].v1_metadata.parent_image_id == 'anotherid'
 
   assert manifest.leaf_layer == manifest.layers[1]
+  assert manifest.created_datetime is None
 
 
 def test_validate_manifest():
@@ -88,6 +89,7 @@ def test_validate_manifest():
   manifest = DockerSchema1Manifest(manifest_bytes, validate=True)
   digest = manifest.digest
   assert digest == 'sha256:b5dc4f63fdbd64f34f2314c0747ef81008f9fcddce4edfc3fd0e8ec8b358d571'
+  assert manifest.created_datetime
 
 
 def test_validate_manifest_with_unicode():
@@ -98,6 +100,7 @@ def test_validate_manifest_with_unicode():
   manifest = DockerSchema1Manifest(manifest_bytes, validate=True)
   digest = manifest.digest
   assert digest == 'sha256:815ecf45716a96b19d54d911e6ace91f78bab26ca0dd299645d9995dacd9f1ef'
+  assert manifest.created_datetime
 
 
 def test_validate_manifest_with_unicode_encoded():
@@ -108,3 +111,4 @@ def test_validate_manifest_with_unicode_encoded():
   manifest = DockerSchema1Manifest.for_latin1_bytes(manifest_bytes, validate=True)
   digest = manifest.digest
   assert digest == 'sha256:dde3714ce7e23edc6413aa85c0b42792e4f2f79e9ea36afc154d63ff3d04e86c'
+  assert manifest.created_datetime