CGI script to extract the client's currently used wifi access point from the Unifi Controller's RESTful API

myap.cgi

#!/bin/bash

# https://ubntwiki.com/products/software/unifi-controller/api

UNIFI_BASE="https://localhost:8443"
UNIFI_USER="readonly"
UNIFI_PASS="password"

echo "content-type: text/plain; charset=utf-8"
echo "Refresh: 10"
echo ""

COOKIEJAR=$(mktemp)
CURLTMP=$(mktemp)
function cleanup() {
        rm "$COOKIEJAR"
        rm "$CURLTMP"
}
trap cleanup EXIT

function test_success () {
        RC=$(jshon -e "meta" -e "rc" -u -F "$CURLTMP")
        if [[ "$RC" != "ok" ]]
        then
                echo "API Error:"
                jshon -e "meta" -F "$CURLTMP"
                exit 1
        fi
}

# Log in to controller
LOGIN_JSON="{\"username\":\"$UNIFI_USER\",\"password\":\"$UNIFI_PASS\"}"
curl --silent --insecure --cookie-jar "$COOKIEJAR" \
        --data "$LOGIN_JSON" "$UNIFI_BASE/api/login" > "$CURLTMP"
test_success

# Get list of access points
curl --silent --insecure --cookie "$COOKIEJAR" --cookie-jar "$COOKIEJAR" \
        --data "$LOGIN_JSON" "$UNIFI_BASE/api/s/default/stat/device" > "$CURLTMP"
test_success

# Map AP ethernet address to AP name
declare -A ACCESS_POINT
OBJECT_COUNT=$(jshon -e "data" -l -F "$CURLTMP")
for ((OBJECT_INDEX=0;OBJECT_INDEX<OBJECT_COUNT;OBJECT_INDEX++))
do
        THIS_NAME=$(jshon -e "data" -e $OBJECT_INDEX -e "name" -u -F "$CURLTMP")
        THIS_MAC=$(jshon -e "data" -e $OBJECT_INDEX -e "mac" -u -F "$CURLTMP")
        ACCESS_POINT["$THIS_MAC"]="$THIS_NAME"
done

# Get list of connected stations
curl --silent --insecure --cookie "$COOKIEJAR" --cookie-jar "$COOKIEJAR" \
        "$UNIFI_BASE/api/s/default/stat/sta" > "$CURLTMP"
test_success

# Walk the list of connected stations until IP address matches
OBJECT_COUNT=$(jshon -e "data" -l -F "$CURLTMP")
for ((OBJECT_INDEX=0;OBJECT_INDEX<OBJECT_COUNT;OBJECT_INDEX++))
do
        THIS_IPADDRESS=$(jshon -e "data" -e $OBJECT_INDEX -e "ip" -u -F "$CURLTMP")
        if [[ "$REMOTE_ADDR" == "$THIS_IPADDRESS" ]]
        then
                # Print details to browser
                THIS_HOSTNAME=$(jshon -e "data" -e $OBJECT_INDEX -e "hostname" -u -F "$CURLTMP")
                THIS_ACCESSPOINT=$(jshon -e "data" -e $OBJECT_INDEX -e "ap_mac" -u -F "$CURLTMP")
                printf "%s\n%s\n%s\n" "$THIS_HOSTNAME" "$THIS_IPADDRESS" "${ACCESS_POINT["$THIS_ACCESSPOINT"]}"
                break
        fi
done