Google Forms monitor

Google Forms monitor

.gitignore

.envrc
gotcha.*.html

gfmon.sh

#! /usr/bin/env bash
#
# Run in WSL. Wait for Google Form to become public, then open it in Chrome.
#
set -e #x
shopt -s nullglob

FORM_TITLE=''

CHROME_PROFILE='Default'
# override this as needed
#CHROME_PROFILE='Profile 1'

main() {
    chk_env

    set_chrome_path
    if [[ ! -x "$CHROME" ]]
    then
        echo "ERROR: Couldn't find Chrome.exe."
        exit 1
    fi >&2

    while printf -v clock '%(%H:%M)T'
    do  head_form "$GOOGLE_FORM_ID"
        case "$clock" in
            09:[345]*) ;;
            09:2[56789]) ;;
            09:2*) sleep 1 ;;
            *) sleep 5 ;;
        esac
    done
}

chk_env() {
    if ! [[ "$GOOGLE_FORM_ID" ]]
    then
        local envfile
        for envfile in .env*
        do if [[ -r "$envfile" && ! -d "$envfile" ]]
        then source $envfile
        fi done
        if ! [[ "$GOOGLE_FORM_ID" ]]
        then
            echo "ERROR: Missing GOOGLE_FORM_ID environment variable."
            exit 1
        fi >&2
    fi
    if ! hash curl xmllint
    then
        echo "ERROR: Please install curl and xmllint."
        exit 1
    fi >&2
}

set_chrome_path() {
    local HKLM_Win="HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows"
    local HKLM_chrome="$HKLM_Win\CurrentVersion\App Paths\chrome.exe"
    local chrome_path=$(reg.exe query "$HKLM_chrome" /ve)
    chrome_path="${chrome_path##*REG_SZ}"
    read -rd$'\r' chrome_path <<<"$chrome_path"
    local drive_letter="${chrome_path:0:1}"
    chrome_path="/mnt/${drive_letter,,}${chrome_path:2}"
    CHROME="${chrome_path//\\//}"
}

head_form() {
    local id="$1"
    local form="https://docs.google.com/forms/d/e/$id/viewform"
    local head=$(curl --silent --head "$form")
    local line1="${head%% $'\r\n'*}"
    local status="${line1#* }"
    local now
    printf -v now "%(%Y-%m-%dT%H:%M:%S)T"

    case "$status" in

        200)
            curl --silent --location "$form" >gotcha.$now.html &
            echo -e "$now GO!\n$head"
            "$CHROME" --profile-directory="$CHROME_PROFILE" \
              --new-window "$form"
            exit 0 ;;

        302)
            local location
            if [[ $head =~ location:\ ([^$'\r']+) ]]
            then
                location="${BASH_REMATCH[1]}"
            fi
            if [[ -z "$FORM_TITLE" ]]
            # only look this up once
            then FORM_TITLE=$(get_html_title "$location")
            fi
            echo "$now $location ($FORM_TITLE)"
            ;;

        404)
            echo -e "$now Form Not Found: $form\n$head"
            exit 1 ;;

        *)
            echo -e "$now\n$head"
            ;;
    esac
}

get_html_title() {
    curl --silent "$1" |xmllint --html \
      --xpath '/html/head/title/text()' \
      - 2>/dev/null
}

main "$@"
exit 0