THU Electricity Balance

electricity_balance.zsh

#!/bin/zsh
set -e

_USERNAME="<your username at myhome.tsinghua.edu.cn>"
_PASSWORD="<your password at myhome.tsinghua.edu.cn>"

tmp=$(curl -fsSL http://myhome.tsinghua.edu.cn/web_netweb_user/noLogin.aspx | grep VIEWSTATE)
viewstate=$(echo $tmp | head -n 1 | sed 's/.*value="\(.*\)".*/\1/g')
viewstategen=$(echo $tmp | tail -n 1 | sed 's/.*value="\(.*\)".*/\1/g')
test -n "$viewstate"
test -n "$viewstategen"

tmp=$(curl -v --location 'http://myhome.tsinghua.edu.cn/web_netweb_user/noLogin.aspx' --form "__VIEWSTATE=\"$viewstate\"" --form "__VIEWSTATEGENERATOR=\"$viewstategen\"" --form "net_Default_LoginCtrl1\$txtUserName=\"$_USERNAME\"" --form "net_Default_LoginCtrl1\$txtPassword=\"$_PASSWORD\"" --form 'net_Default_LoginCtrl1$btnLogin="%B5%C7++%C2%BC"' 2>&1 >/dev/null | grep ASP.NET_SessionId)
sess_id=$(echo $tmp | /bin/sed 's/.*SessionId=\(.*\); path.*/\1/g')
test -n "$sess_id"

tmp=$(curl -fsSL -b "ASP.NET_SessionId=$sess_id" http://myhome.tsinghua.edu.cn/web_Netweb_List/Netweb_Home_electricity_Detail.aspx)
raw_time=$(echo $tmp | grep Netweb_Home_electricity_DetailCtrl1_lbltime | sed 's?.*Red">\(.*\)</font.*?\1?g' )
test -n "$raw_time"
ts=$(date -d $raw_time +%s)000000000
balance=$(echo $tmp | grep Netweb_Home_electricity_DetailCtrl1_lblele | sed 's?.*Red">\(.*\)</font.*?\1?g' )
test -n "$balance"
echo electricity_balance value=$balance $ts

Updates can be found here.