electribot.sh

#!/bin/sh

# Capture: http://www.cpcelc.pku.edu.cn/phone/socket.php?apistr=XXXXX
OPERID="XXXXXXXXXXXXXXXXXXXXX"
# Reading Log
READING_LOG="/tmp/eletribot.log"
LOW_THRESHOLD=10
# Serverchan sendkey https://sct.ftqq.com/
SCKEY="YYYYYYYYYYYYYYYYYYYYYYY"

get_reading() {
    PAYLOAD_STR=$(printf 'apistr={"operType":"BGRJ2018_CXDBSY_BY","operFlag":300023,"OperID":"%s"}' "$OPERID")
    FLOAT_VAL=$(curl -Gs http://www.cpcelc.pku.edu.cn/phone/socket.php \
        --data-urlencode "$PAYLOAD_STR" \
        | grep -oE "([0-9]{1,3}\.)[0-9]{1,3}" \
        | head -n 1)
    if [ -z "$FLOAT_VAL" ]; then
        echo "Failed to get reading"
        exit 1
    fi
    printf "%.0f" "$FLOAT_VAL"
}

get_date_iso() {
    date -u +"%Y-%m-%dT%H:%M:%SZ"
}

send_sc_message() {
    if [ -z "$1" ] || [ -z "$2" ]; then
        echo "Missing message or title: message=$1 title=$2"
        return 1
    fi
    curl -Gs "https://sc.ftqq.com/$SCKEY.send" \
        -X POST \
        -H 'Content-Type: application/x-www-form-urlencoded' \
        --data-urlencode "$(printf 'title=%s' "$1")" \
        --data-urlencode "$(printf 'desp=%s' "$2")"
}

READING=$(get_reading)
echo "Current reading: $READING"
echo "$(get_date_iso) $READING" >> "$READING_LOG"
if [ -z "$READING" ]; then
    echo "Failed to get reading"
    exit 1
fi

TITLE=$(printf '电量剩余%s度' "$READING")
if [ -f "$READING_LOG" ]; then
    MESSAGE="最近三次读数："
    MESSAGE="$MESSAGE $(printf '%s\n' "$(tail -n 3 "$READING_LOG")")"
else
    touch "$READING_LOG"
    MESSAGE="没有近期记录"
fi

if [ "$READING" -lt "$LOW_THRESHOLD" ]; then
    TITLE="【尽快充电】$TITLE"
    MESSAGE="购电：http://www.cpcelc.pku.edu.cn/phone/mainpage.php
$MESSAGE"
fi

echo "$TITLE" "$MESSAGE"
send_sc_message "$TITLE" "$MESSAGE"