import {RouterContext} from 'koa-router'
import path from 'path'
import {decrypt} from './strCrypto'

/**
 * @param possiblePath 可能是路径 也可能是路名加密后的串, 即文件id
 */
export default function (ctx: RouterContext, possiblePath: string): string {
  const root = ctx.legoOption.root

  if (!possiblePath.includes(path.sep)) {
    possiblePath = decrypt(possiblePath)
  }

  if (path.isAbsolute(possiblePath)) {
    return possiblePath
  }

  return path.resolve(root, possiblePath)
}