Assert some monitored domains are available given a page title to be checked

assert_monitored_domains_are_available.sh

#!/usr/bin/env bash
set -Eeuo pipefail

source "${HOME}/.secrets.sh"

function convert_timestamp_to_date_in_selected_timezone() {
    local timestamp
    timestamp="${1}"

    if [ -z "${timestamp}" ]; then

        printf 'A %s is expected as %s (%s).%s' 'non-empty string' 'first argument' '(timestamp)' $'\n' 1>&2

        return 1

    fi

    date --date @${timestamp}
}
alias timestamp-to-date='convert_timestamp_to_date_in_selected_timezone'

function now() {
    date -Iminutes |
        sed -E 's/T/_/g' |
        sed -E 's/:/H/g' |
        sed -E 's/(\+.+)//g'
}
alias now='now'

function warn_about() {
    local message
    message="${1}"

    curl -q --silent --json '{"user": "'$SMS_SERVICE_PROVIDER_USER_ID'", "pass": "'$SMS_SERVICE_PROVIDER_PASSWORD'", "msg": "'${message}'"}' "${SMS_SERVICE_PROVIDER_ENDPOINT}"
}
alias warn-about='warn_about'

function warn_about_unavailable_service() {
    local message
    message="$(echo "${1} is down")"

    warn_about "${message}"
}
alias warn-about-unavailable-service='warn_about_unavailable_service'

function assert_title_at_domain_equals() {
    (
        export PATH="/opt/homebrew/bin:${PATH}"

        local domain="$1"
        local expected_title="$2"

        if [ -z "${expected_title}" ]; then

            printf 'A %s is expected as %s (%s).%s' 'non-empty string' 'second argument' 'title' $'\n'

            return 1

        fi

        local actual_title
        actual_title="$(curl -sL "${domain}" | htmlq title --text)"

        if [ -n "${DEBUG}" ]; then
            echo "Requested '${domain}'" 1>&2
            echo "Actual title is '${actual_title}'" 1>&2
        fi

        test "${actual_title}" = "${expected_title}"
        exit_code=$?

        if [ ${exit_code} -gt 0 ]; then

            return ${exit_code}

        fi

    )
}
alias assert-title-at-domain-equals='assert_title_at_domain_equals'

function assert_monitored_domain_is_available() {
    local exit_code

    local domain
    domain="${1}"

    local expected_title
    expected_title="${2}"

    assert_title_at_domain_equals "${domain}" "${expected_title}"

    exit_code=$?

    if [ $exit_code -gt 0 ]; then

        echo "${domain} is down 🙈."
        warn_about_unavailable_service "${domain}"

        return ${exit_code}

    else

        echo "${domain} is up and kicking 💁."

    fi
}
alias assert-monitored-domain-is-available='assert_monitored_domain_is_available'

function assert_monitored_domains_are_available() {
    printf 'Monitoring starts at %s.%s' "$(now)" $'\n'

    (assert_monitored_domain_is_available 'https://example.org' 'Example Domain')

    printf 'Monitoring ends at %s.%s' "$(now)" $'\n'
}
alias assert-monitored-domains-are-available='assert_monitored_domains_are_available'

set +Eeuo pipefail

# Copyright (C) 2024  Thierry Marianne <[email protected]> -- assert_monitored_domains_are_available.sh
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.