Add expires message header (#61)

The header is time in milliseconds to expire the message.

Author: emilyzheng

src/pubtools/sign/signers/msgsigner.py

@@ -214,6 +214,7 @@ def _construct_headers(
             "owner_id": self.creator,
             "mtype": sig_type.value,
             "source": "metadata",
+            "expires": self.timeout * self.retries * 1000,
         }
         if extra_attrs:
             headers.update(extra_attrs)

tests/test_msg_batch_signer.py

@@ -261,6 +261,7 @@ def test_create_msg_batch_message(f_config_msg_batch_signer_ok):
                     headers={
                         "service": "pubtools-sign",
                         "environment": "prod",
+                        "expires": 3000,
                         "owner_id": "pubtools-sign-test",
                         "mtype": "batch",
                         "source": "metadata",

tests/test_msg_signer.py

@@ -489,6 +489,7 @@ def test__construct_headers(f_config_msg_signer_ok):
             assert ret == {
                 "service": "pubtools-sign",
                 "environment": "prod",
+                "expires": 3000,
                 "owner_id": "pubtools-sign-test",
                 "mtype": SignRequestType.CONTAINER,
                 "source": "metadata",
@@ -522,6 +523,7 @@ def test_create_msg_message(f_config_msg_signer_ok):
                         "service": "pubtools-sign",
                         "environment": "prod",
                         "owner_id": "pubtools-sign-test",
+                        "expires": 3000,
                         "mtype": SignRequestType.CONTAINER,
                         "source": "metadata",
                     },
@@ -544,6 +546,7 @@ def test_create_msg_message(f_config_msg_signer_ok):
                         "service": "pubtools-sign",
                         "environment": "prod",
                         "owner_id": "pubtools-sign-test",
+                        "expires": 3000,
                         "mtype": SignRequestType.CLEARSIGN,
                         "source": "metadata",
                     },