refactor(whatsapp): share target resolver

src/whatsapp/resolve-outbound-target.ts

@@ -0,0 +1,53 @@
+import { missingTargetError } from "../infra/outbound/target-errors.js";
+import { isWhatsAppGroupJid, normalizeWhatsAppTarget } from "./normalize.js";
+
+export type WhatsAppOutboundTargetResolution =
+  | { ok: true; to: string }
+  | { ok: false; error: Error };
+
+export function resolveWhatsAppOutboundTarget(params: {
+  to: string | null | undefined;
+  allowFrom: Array<string | number> | null | undefined;
+  mode: string | null | undefined;
+}): WhatsAppOutboundTargetResolution {
+  const trimmed = params.to?.trim() ?? "";
+  const allowListRaw = (params.allowFrom ?? [])
+    .map((entry) => String(entry).trim())
+    .filter(Boolean);
+  const hasWildcard = allowListRaw.includes("*");
+  const allowList = allowListRaw
+    .filter((entry) => entry !== "*")
+    .map((entry) => normalizeWhatsAppTarget(entry))
+    .filter((entry): entry is string => Boolean(entry));
+
+  if (trimmed) {
+    const normalizedTo = normalizeWhatsAppTarget(trimmed);
+    if (!normalizedTo) {
+      return {
+        ok: false,
+        error: missingTargetError("WhatsApp", "<E.164|group JID>"),
+      };
+    }
+    if (isWhatsAppGroupJid(normalizedTo)) {
+      return { ok: true, to: normalizedTo };
+    }
+    if (params.mode === "implicit" || params.mode === "heartbeat") {
+      if (hasWildcard || allowList.length === 0) {
+        return { ok: true, to: normalizedTo };
+      }
+      if (allowList.includes(normalizedTo)) {
+        return { ok: true, to: normalizedTo };
+      }
+      return {
+        ok: false,
+        error: missingTargetError("WhatsApp", "<E.164|group JID>"),
+      };
+    }
+    return { ok: true, to: normalizedTo };
+  }
+
+  return {
+    ok: false,
+    error: missingTargetError("WhatsApp", "<E.164|group JID>"),
+  };
+}