EMailed label return generation (alpha)

app/return_labels.py

@@ -0,0 +1,22 @@
+"""
+The emailed-return-label SKUs (SH007 for Signify, OK012 for Oak Street)
+mark a ticket as a different kind of request entirely: not an outbound
+kit, but a return label to be created and emailed to a client who
+already has product to send back. See app/services/shipstation_send.py
+for the label-creation side of this.
+"""
+from __future__ import annotations
+
+from app import config
+from app.status_rules import parse_status_list
+
+
+def get_emailed_label_skus() -> set[str]:
+    return parse_status_list(
+        config.get("EMAILED_LABEL_SKUS", config.DEFAULT_EMAILED_LABEL_SKUS)
+    )
+
+
+def is_emailed_label_order(skus: list[str]) -> bool:
+    emailed_skus = get_emailed_label_skus()
+    return any((sku or "").strip().lower() in emailed_skus for sku in skus or [])