Tweak the import/export system to handle encryption choices better

Now when you export a document, the `storage_type` value is always
`unencrypted` (since that's what it is when it's exported anyway), and
the flag is set by the importing script instead, based on the existence
of a `PAPERLESS_PASSPHRASE` environment variable, indicating that
encryption is enabled.

src/documents/management/commands/document_exporter.py

@@ -55,7 +55,12 @@ class Command(Renderable, BaseCommand):
         documents = Document.objects.all()
         document_map = {d.pk: d for d in documents}
         manifest = json.loads(serializers.serialize("json", documents))
-        for document_dict in manifest:
+
+        for index, document_dict in enumerate(manifest):
+
+            # Force output to unencrypted as that will be the current state.
+            # The importer will make the decision to encrypt or not.
+            manifest[index]["fields"]["storage_type"] = Document.STORAGE_TYPE_UNENCRYPTED  # NOQA: E501
 
             document = document_map[document_dict["pk"]]
 

src/documents/management/commands/document_importer.py

@@ -94,7 +94,7 @@ class Command(Renderable, BaseCommand):
             document_path = os.path.join(self.source, doc_file)
             thumbnail_path = os.path.join(self.source, thumb_file)
 
-            if document.storage_type == Document.STORAGE_TYPE_GPG:
+            if settings.PASSPHRASE:
 
                 with open(document_path, "rb") as unencrypted:
                     with open(document.source_path, "wb") as encrypted:
@@ -112,3 +112,15 @@ class Command(Renderable, BaseCommand):
 
                 shutil.copy(document_path, document.source_path)
                 shutil.copy(thumbnail_path, document.thumbnail_path)
+
+        # Reset the storage type to whatever we've used while importing
+
+        storage_type = Document.STORAGE_TYPE_UNENCRYPTED
+        if settings.PASSPHRASE:
+            storage_type = Document.STORAGE_TYPE_GPG
+
+        Document.objects.filter(
+            pk__in=[r["pk"] for r in self.manifest]
+        ).update(
+            storage_type=storage_type
+        )