Function resolveTarget

shift/shift.ts:722–744

(
  client: TelegramClient,
  targetInput: string,
  currentChatId: number
)

  try {
    const numericId = parseInt(targetInput);
    if (!isNaN(numericId)) {
      return await client.getEntity(numericId);
    }
  } catch (error) {
    // Fall through to username
  }

  return await client.getEntity(targetInput);
}

async function isCircularForward(
  sourceId: number,
  targetId: number
): Promise<{ isCircular: boolean; message: string }> {
  if (sourceId === targetId) {
    return { isCircular: true, message: "不能设置自己到自己的转发规则" };
  }

  const visited = new Set([sourceId]);
  let currentId = targetId;

  for (let i = 0; i < 20; i++) {
    if (visited.has(currentId)) {
      return { isCircular: true, message: `检测到间接循环：${currentId}` };
    }