feat(admission): add group VPN exceptions

packages/auth/src/index.ts

@@ -115,6 +115,24 @@ export function resolveEffectiveGroup<T>(explicitGroup: T | null, defaultGroup:
   return explicitGroup ?? defaultGroup;
 }
 
+export function isGameNetworkAllowed(
+  classification: "unknown" | "clear" | "vpn" | "proxy" | "hosting" | "tor",
+  anonymizedNetworksAllowed: boolean,
+) {
+  return anonymizedNetworksAllowed || !["vpn", "proxy", "tor"].includes(classification);
+}
+
+export function gameAdmissionDenialReason(
+  group: { accessEnabled: boolean; anonymizedNetworksAllowed: boolean } | null,
+  classification: "unknown" | "clear" | "vpn" | "proxy" | "hosting" | "tor",
+) {
+  if (!group?.accessEnabled) return "group_access_disabled" as const;
+  if (!isGameNetworkAllowed(classification, group.anonymizedNetworksAllowed)) {
+    return "anonymized_network_disallowed" as const;
+  }
+  return null;
+}
+
 export function verifyHashedToken(providedToken: string, expectedHash: string) {
   const provided = Buffer.from(hashToken(providedToken), "utf8");
   const expected = Buffer.from(expectedHash, "utf8");