refactor: dedupe shared helpers across ui/gateway/extensions

src/channels/allowlist-match.ts

@@ -21,3 +21,32 @@ export function formatAllowlistMatchMeta(
 ): string {
   return `matchKey=${match?.matchKey ?? "none"} matchSource=${match?.matchSource ?? "none"}`;
 }
+
+export function resolveAllowlistMatchSimple(params: {
+  allowFrom: Array<string | number>;
+  senderId: string;
+  senderName?: string | null;
+}): AllowlistMatch<"wildcard" | "id" | "name"> {
+  const allowFrom = params.allowFrom
+    .map((entry) => String(entry).trim().toLowerCase())
+    .filter(Boolean);
+
+  if (allowFrom.length === 0) {
+    return { allowed: false };
+  }
+  if (allowFrom.includes("*")) {
+    return { allowed: true, matchKey: "*", matchSource: "wildcard" };
+  }
+
+  const senderId = params.senderId.toLowerCase();
+  if (allowFrom.includes(senderId)) {
+    return { allowed: true, matchKey: senderId, matchSource: "id" };
+  }
+
+  const senderName = params.senderName?.toLowerCase();
+  if (senderName && allowFrom.includes(senderName)) {
+    return { allowed: true, matchKey: senderName, matchSource: "name" };
+  }
+
+  return { allowed: false };
+}