某个网站提供免费的SS服务器,不过隔几分钟就会更换密码。本意就是让用户体验下服务，之后来包月。本来就想着探索下怎么用python来写个爬网站，正好试试怎么自动抓到密码，避免每次都手动操作。不是要钻人家空子，只是好玩而已，我还是很乐意付费的。
做法很简单，该网站页面既显示密码，又提供gui-config下载，拿到之后替换本地的config，自动重启下SS即可。

代码：

#update ss with free bw node
import urllib.request, urllib.parse
import os.path
import json
import sched
import time

schedule = sched.scheduler ( time.time, time.sleep )  

def getLoginCookies():

    cookie = "本地"
    return cookie

def getPage(url, headers):
    req = urllib.request.Request(url, headers=headers)
    response = urllib.request.urlopen(req)
    html_bytes = response.read()
    html_string = html_bytes.decode('utf-8')
    return html_string,html_bytes

def getHttpHeaders(cookie):
    headers = {}
    headers['Cookie'] = cookie
    headers['User-Agent']='Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.101 Safari/537.36'
    return headers

def getJsonHeaders(cookie):
    headers = getHttpHeaders(cookie)
    headers['Content-Type']='application/json'
    return headers
    
def getFreeBwNodePage(cookie):
    headers = getJsonHeaders(cookie)
    url = 'https://www.我不写出来.com/ucenter/?act=free_nodes_export'
    content = getPage(url, headers)
    return content

def modify_free_config(config,dest):
    x0 = json.loads(config)
    destfile = os.path.join(dest, 'gui-config.json')
    
    f = open(destfile, 'rt')
    x1 = json.loads(f.read())
    f.close()
    x1['configs'][0]['password'] = x0['configs'][0]['password']
    print('NewPassword:{0}'.format(x0['configs'][0]['password']))

    f = open(destfile, 'wt')
    f.write(json.dumps(x1))
    f.close()

def stop_program(procname):
    os.system('TASKKILL /F /IM {0}*'.format(procname))

def start_program(progpath):
    os.startfile(progpath)  

def refreshSS():
    ssroot = r'sspath'
    ssname = 'ssname'
    cookie = getLoginCookies()
    print('get cookie:{0}'.format(cookie))
    
    content = getFreeBwNodePage(cookie)
    print('get bw node:{0}'.format(content[0]))
    
    stop_program('Shadow')
    modify_free_config(content[0], ssroot)
    start_program(os.path.join(ssroot,ssname))
    print('SS config refreshed')

def scheduledRefreshSS():
    M1 = 60
    M3 = M1 * 3
    schedule.enter(M3,0,refreshSS)
    schedule.run()

if __name__ == '__main__':
    refreshSS()
    scheduledRefreshSS()