#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @File  : core.py
# @Author: becivells
#@Contact : becivells@gmail.com
# @Date  : 2017/10/19
#@Software : PyCharm
# @Desc  :

import re
import tempfile
import subprocess
from config import repo
from config import EXEC_WHITE_LIST
from config import PATH_WHITE_LIST
def runcmd(cmd,path):
    out_temp = tempfile.SpooledTemporaryFile(max_size=10 * 1000)
    try:
        fileno = out_temp.fileno()
        p = subprocess.Popen(cmd, shell=True,cwd=path, stdout=fileno, stderr=fileno)
        p.wait()
        out_temp.seek(0)
        return out_temp.read()
    except Exception as e:
        return str(e)
    finally:
        if out_temp:
            out_temp.close()

def allow_exec(cmd):
    '''
    白名单函数允许指定命令运行并且限制长度
    :param cmd:
    :return:
    '''
    cmd = ' '.join(cmd.split()) #移除多余空格

    if len(cmd) > 100: #限制长度
        return False

    for whitecmd in EXEC_WHITE_LIST:
        result = re.findall(whitecmd,cmd)

        if result and cmd == result[0]:
            return True

    return False

def allow_path(path):
    '''
    限制路径
    :param path:
    :return:
    '''
    path = path.strip()
    for whitepath in PATH_WHITE_LIST:
        result = re.findall(whitepath,path)

        if result and path == result[0]:
            return True

    return False

def getrepo():
    '''
    更新配置文件
    :return:
    '''
    return repo