feat: govern legacy archive encryption

src/govoplan_campaign/backend/sending/execution.py

@@ -9,6 +9,10 @@ from pydantic import BaseModel, ConfigDict
 from sqlalchemy.orm import Session
 
 from govoplan_campaign.backend.db.models import Campaign, CampaignJob, CampaignVersion, JobValidationStatus
+from govoplan_campaign.backend.archive_encryption import (
+    CampaignArchiveEncryptionError,
+    assert_archive_encryption_allowed,
+)
 from govoplan_campaign.backend.campaign.models import (
     DeliveryChannelPolicy,
     DeliveryConfig,
@@ -22,8 +26,8 @@ from govoplan_campaign.backend.campaign.mail_profile_boundary import (
 from govoplan_campaign.backend.integrations import MailProfileError, files_integration, mail_integration
 from govoplan_campaign.backend.path_security import CampaignPathSecurityError, assert_server_safe_campaign_paths
 
-SNAPSHOT_VERSION = "8"
-SUPPORTED_SNAPSHOT_VERSIONS = {"6", "7", SNAPSHOT_VERSION}
+SNAPSHOT_VERSION = "9"
+SUPPORTED_SNAPSHOT_VERSIONS = {"6", "7", "8", SNAPSHOT_VERSION}
 
 
 class ExecutionSnapshotError(RuntimeError):
@@ -57,6 +61,7 @@ class ExecutionSnapshot(BaseModel):
     queueable_job_count: int = 0
     job_manifest_sha256: str | None = None
     effective_policy_sha256: str | None = None
+    archive_encryption: dict[str, Any] | None = None
     smtp_transport_revision: str | None = None
     imap_transport_revision: str | None = None
     uses_mail: bool = True
@@ -263,6 +268,7 @@ def create_execution_snapshot(
     imap_credential_id: str | None = None,
     jobs: Iterable[CampaignJob] = (),
     build_summary: dict[str, Any] | None = None,
+    archive_encryption: dict[str, Any] | None = None,
 ) -> tuple[dict[str, Any], str]:
     raw_json = version.raw_json if isinstance(version.raw_json, dict) else {}
     job_list = list(jobs)
@@ -311,6 +317,7 @@ def create_execution_snapshot(
             delivery,
             snapshot_version=SNAPSHOT_VERSION,
         ),
+        archive_encryption=archive_encryption,
         smtp_transport_revision=smtp_transport_revision,
         imap_transport_revision=imap_transport_revision,
         uses_mail=uses_mail,
@@ -355,6 +362,39 @@ def _assert_snapshot_matches_persisted_inputs(
             "Revalidate and rebuild the campaign before delivery."
         )
 
+    campaign = session.get(Campaign, version.campaign_id)
+    if campaign is None:
+        raise ExecutionSnapshotError("Execution snapshot Campaign no longer exists")
+    try:
+        current_archive_policy = assert_archive_encryption_allowed(
+            session,
+            campaign,
+            raw_json,
+        )
+    except CampaignArchiveEncryptionError as exc:
+        raise ExecutionSnapshotError(str(exc)) from exc
+    archive_snapshot = snapshot.archive_encryption
+    configured_archives = (
+        ((raw_json.get("attachments") or {}).get("zip") or {}).get("archives")
+        if isinstance(raw_json.get("attachments"), dict)
+        else None
+    )
+    if configured_archives and not isinstance(archive_snapshot, dict):
+        raise ExecutionSnapshotError(
+            "Execution snapshot has no governed archive-encryption evidence; rebuild before delivery."
+        )
+    if isinstance(archive_snapshot, dict):
+        frozen_policy = archive_snapshot.get("policy")
+        frozen_hash = (
+            frozen_policy.get("policy_hash")
+            if isinstance(frozen_policy, dict)
+            else None
+        )
+        if frozen_hash != current_archive_policy.policy_hash:
+            raise ExecutionSnapshotError(
+                "The effective archive-encryption policy changed after build. Revalidate and rebuild before delivery."
+            )
+
     if effect_job is not None:
         if effect_job.campaign_version_id != version.id:
             raise ExecutionSnapshotError("Campaign job does not belong to the snapshotted version")
@@ -494,6 +534,12 @@ def ensure_execution_snapshot(
         delivery=config.delivery,
         jobs=jobs,
         build_summary=version.build_summary if isinstance(version.build_summary, dict) else {},
+        archive_encryption=(
+            version.build_summary.get("archive_encryption")
+            if isinstance(version.build_summary, dict)
+            and isinstance(version.build_summary.get("archive_encryption"), dict)
+            else None
+        ),
     )
     version.execution_snapshot = payload
     version.execution_snapshot_hash = digest