Copy archive meta in update task

fimfarchive/tasks/update.py

@@ -24,6 +24,7 @@ Update task.
 
 import os
 import time
+from copy import deepcopy
 from typing import Optional
 
 from fimfarchive.exceptions import InvalidStoryError
@@ -172,6 +173,29 @@ class UpdateTask(SignalSender):
         else:
             raise ValueError("Unsupported story flavor.")
 
+    def copy_archive_meta(
+            self,
+            old: Optional[Story],
+            new: Optional[Story],
+            ) -> None:
+        """
+        Copies archive meta from old story to new.
+
+        Args:
+            old: The story to copy from.
+            new: The story to copy to.
+
+        Raises:
+            ValueError: If new story already contains archive meta.
+        """
+        try:
+            if 'archive' in new.meta:
+                raise ValueError("New story contains archive meta.")
+
+            new.meta['archive'] = deepcopy(old.meta['archive'])
+        except (AttributeError, InvalidStoryError, KeyError):
+            return
+
     def update(self, key: int) -> Optional[Story]:
         """
         Updates the specified story.
@@ -184,6 +208,8 @@ class UpdateTask(SignalSender):
         """
         old = self.fetch(self.fimfarchive, key)
         new = self.fetch(self.fimfiction, key)
+
+        self.copy_archive_meta(old, new)
         selected = self.select(old, new)
 
         if selected and UpdateStatus.REVIVED in selected.flavors:

tests/tasks/test_update.py

@@ -22,6 +22,7 @@ Update task tests.
 #
 
 
+from typing import Dict
 from unittest.mock import MagicMock, call, patch
 
 import pytest
@@ -45,7 +46,7 @@ class DummyFetcher(Fetcher):
         """
         Constructor.
         """
-        self.stories = dict()
+        self.stories: Dict[int, Story] = dict()
 
     def add(self, key, date, flavors=()):
         """
@@ -111,6 +112,13 @@ class TestUpdateTask:
         """
         return MagicMock()
 
+    @pytest.fixture
+    def archive(self):
+        """
+        Returns an archive meta dictionary.
+        """
+        return {'key': 'value'}
+
     @pytest.fixture
     def task(self, fimfarchive, fimfiction, selector, stamper, tmpdir):
         """
@@ -199,25 +207,31 @@ class TestUpdateTask:
 
         self.verify_fetch(task, target, UpdateStatus.CREATED)
 
-    def test_revived_story(self, task, fimfarchive, fimfiction):
+    def test_revived_story(self, task, fimfarchive, fimfiction, archive):
         """
         Tests updating for a revived story.
         """
         target = fimfarchive.add(key=1, date=1)
         other = fimfiction.add(key=1, date=1)
+        target.meta['archive'] = archive
 
         target.merge = MagicMock(return_value=target)
         self.verify_fetch(task, target, UpdateStatus.REVIVED)
         target.merge.assert_called_once_with(meta=other.meta)
+        assert other.meta['archive'] is not archive
+        assert other.meta['archive'] == archive
 
-    def test_updated_story(self, task, fimfarchive, fimfiction):
+    def test_updated_story(self, task, fimfarchive, fimfiction, archive):
         """
         Tests updating for an updated story.
         """
-        fimfarchive.add(key=1, date=0)
+        other = fimfarchive.add(key=1, date=0)
         target = fimfiction.add(key=1, date=1)
+        other.meta['archive'] = archive
 
         self.verify_fetch(task, target, UpdateStatus.UPDATED)
+        assert target.meta['archive'] is not archive
+        assert target.meta['archive'] == archive
 
     def test_deleted_story(self, task, fimfarchive):
         """
@@ -317,6 +331,17 @@ class TestUpdateTask:
         with pytest.raises(ValueError):
             task.write(story)
 
+    def test_remote_archive(self, task, fimfarchive, fimfiction, archive):
+        """
+        Tests `ValueError` is raised if Fimfiction returns archive meta.
+        """
+        old = fimfarchive.add(key=1, date=0)
+        new = fimfiction.add(key=1, date=1)
+        new.meta['archive'] = archive
+
+        with pytest.raises(ValueError):
+            task.copy_archive_meta(old, new)
+
 
 class TestRefetchingUpdateTask(TestUpdateTask):
     """