ref(billing): Add quota_config_mapping for proto/sentry QuotaConfig conversion

src/sentry/billing/platform/services/quota_config_mapping.py

@@ -0,0 +1,53 @@
+from __future__ import annotations
+
+from sentry_protos.billing.v1.quota_config_pb2 import QuotaConfig as ProtoQuotaConfig
+from sentry_protos.billing.v1.quota_config_pb2 import QuotaScope as ProtoQuotaScope
+
+from sentry.billing.platform.services.category_mapping import (
+    proto_to_sentry_category,
+    sentry_to_proto_category,
+)
+from sentry.constants import DataCategory
+from sentry.quotas.base import QuotaConfig, QuotaScope
+
+
+def sentry_to_proto_quota_config(quota: QuotaConfig) -> ProtoQuotaConfig:
+    """Convert a sentry QuotaConfig to its proto equivalent."""
+    kwargs: dict = {
+        "id": quota.id or "",
+        "categories": sorted(sentry_to_proto_category(int(c)) for c in quota.categories),
+        "scope": ProtoQuotaScope.ValueType(int(quota.scope))
+        if quota.scope is not None
+        else ProtoQuotaScope.QUOTA_SCOPE_UNSPECIFIED,
+    }
+    if quota.scope_id is not None:
+        kwargs["scope_id"] = quota.scope_id
+    if quota.limit is not None:
+        kwargs["limit"] = quota.limit
+    if quota.window is not None:
+        kwargs["window"] = quota.window
+    if quota.reason_code is not None:
+        kwargs["reason_code"] = quota.reason_code
+
+    return ProtoQuotaConfig(**kwargs)
+
+
+def proto_to_sentry_quota_config(proto_quota: ProtoQuotaConfig) -> QuotaConfig:
+    """Convert a proto QuotaConfig to its sentry equivalent."""
+    categories = [DataCategory(proto_to_sentry_category(c)) for c in proto_quota.categories]
+
+    scope = (
+        QuotaScope(proto_quota.scope)
+        if proto_quota.scope != ProtoQuotaScope.QUOTA_SCOPE_UNSPECIFIED
+        else QuotaScope.ORGANIZATION
+    )
+
+    return QuotaConfig(
+        id=proto_quota.id or None,
+        categories=categories,
+        scope=scope,
+        scope_id=proto_quota.scope_id if proto_quota.HasField("scope_id") else None,
+        limit=proto_quota.limit if proto_quota.HasField("limit") else None,
+        window=proto_quota.window if proto_quota.HasField("window") else None,
+        reason_code=proto_quota.reason_code if proto_quota.HasField("reason_code") else None,
+    )