WeChat (Chinese: 微信; pinyin: About this sound Wēixìn; literally: “micro message”) is a mobile text and voice messaging communication service developed by Tencent in China, first released in January 2011. It is one of the largest standalone messaging apps by monthly active users. To benefit teachers and students in my college, our team set up a Wechat platform, which supports querying personal information, querying curriculum, querying grade, introducing communities, introducing activities and etc.
Auto Responder
Auto Responder is one of the modules in our project and I was responsible for its development and maintenance.
I set up the server for our project on Sina Cloud. The principle is as following:
- get the user input from our Wechat platform
- send POST request to http://www.xiaohuangji.com, which is an auto-response online robot
- parse XML returned by the website
- show the response to the user
Some core codes on our Sina Cloud server are shown as below :
# -*- coding: utf-8 -*-
import hashlib
import web
import lxml
import time
import os
import urllib2,json
from lxml import etree
import urllib
class WeixinInterface:
def __init__(self):
self.app_root = os.path.dirname(__file__)
self.templates_root = os.path.join(self.app_root, 'templates')
self.render = web.template.render(self.templates_root)
def GET(self):
#get input parameter
data = web.input()
signature=data.signature
timestamp=data.timestamp
nonce=data.nonce
echostr=data.echostr
#your own token
token="immiao"
#sort by lexicographic order
list=[token,timestamp,nonce]
list.sort()
sha1=hashlib.sha1()
map(sha1.update,list)
hashcode=sha1.hexdigest()
#sha1 encryption algorithm
#if the request is from Wechat，response echostr
if hashcode == signature:
return echostr
def POST(self):
str_xml = web.data() #get data from POST
xml = etree.fromstring(str_xml)#parse XML
content=xml.find("Content").text#get the input from the users
msgType=xml.find("MsgType").text
fromUser=xml.find("FromUserName").text
toUser=xml.find("ToUserName").text
url = 'http://www.xiaohuangji.com/ajax.php'
content = content.encode('utf-8')
values = {'para':content}
data = urllib.urlencode(values)
#print data
req = urllib2.Request(url, data)
response = urllib2.urlopen(req)
the_page = response.read()
#print the_page
if the_page!='':
return self.render.reply_text(fromUser,toUser,int(time.time()),the_page)
else:
return self.render.reply_text(fromUser,toUser,int(time.time()),u'Can not recognize your input')Exhibition
