refactor(zalouser): extract policy and message helpers

extensions/zalouser/src/group-policy.ts

@@ -0,0 +1,78 @@
+import type { ZalouserGroupConfig } from "./types.js";
+
+type ZalouserGroups = Record<string, ZalouserGroupConfig>;
+
+function toGroupCandidate(value?: string | null): string {
+  return value?.trim() ?? "";
+}
+
+export function normalizeZalouserGroupSlug(raw?: string | null): string {
+  const trimmed = raw?.trim().toLowerCase() ?? "";
+  if (!trimmed) {
+    return "";
+  }
+  return trimmed
+    .replace(/^#/, "")
+    .replace(/[^a-z0-9]+/g, "-")
+    .replace(/^-+|-+$/g, "");
+}
+
+export function buildZalouserGroupCandidates(params: {
+  groupId?: string | null;
+  groupChannel?: string | null;
+  groupName?: string | null;
+  includeGroupIdAlias?: boolean;
+  includeWildcard?: boolean;
+}): string[] {
+  const seen = new Set<string>();
+  const out: string[] = [];
+  const push = (value?: string | null) => {
+    const normalized = toGroupCandidate(value);
+    if (!normalized || seen.has(normalized)) {
+      return;
+    }
+    seen.add(normalized);
+    out.push(normalized);
+  };
+
+  const groupId = toGroupCandidate(params.groupId);
+  const groupChannel = toGroupCandidate(params.groupChannel);
+  const groupName = toGroupCandidate(params.groupName);
+
+  push(groupId);
+  if (params.includeGroupIdAlias === true && groupId) {
+    push(`group:${groupId}`);
+  }
+  push(groupChannel);
+  push(groupName);
+  if (groupName) {
+    push(normalizeZalouserGroupSlug(groupName));
+  }
+  if (params.includeWildcard !== false) {
+    push("*");
+  }
+  return out;
+}
+
+export function findZalouserGroupEntry(
+  groups: ZalouserGroups | undefined,
+  candidates: string[],
+): ZalouserGroupConfig | undefined {
+  if (!groups) {
+    return undefined;
+  }
+  for (const candidate of candidates) {
+    const entry = groups[candidate];
+    if (entry) {
+      return entry;
+    }
+  }
+  return undefined;
+}
+
+export function isZalouserGroupEntryAllowed(entry: ZalouserGroupConfig | undefined): boolean {
+  if (!entry) {
+    return false;
+  }
+  return entry.allow !== false && entry.enabled !== false;
+}