useful-scripts/bin/citrix-update

#!/bin/bash

# name:     citrix-update
# summary:  Startup script: Downloads and installs "Citrix Workspace"
# params:   none

THISDIR="$(dirname "$(readlink -f "${0}")")"
# shellcheck disable=SC1091
. "${THISDIR}/.inc/common"

########
# INIT #
########
# find all download links on update page
# find corresponding checksums

needs_commands "xidel" "curl" || exit 1

echo -n "Downloading citrix update page ... " >&2
html_data="$(curl -sSfL 'https://www.citrix.com/downloads/workspace-app/linux/workspace-app-for-linux-latest.html')"
echo "OK!" >&2

# # XPath playground
# echo "${html_data}" | xidel - \
#   --silent \
#   --printed-node-format text \
#   --extract "links:=//div[contains(@class, 'ctx-dl-content')]//a[contains(@class, 'ctx-dl-link') and @rel]/@rel" \
#   --extract "csums:=//div[contains(@class, 'ctx-dl-content')]//ul[contains(@class, 'ctx-checksum-list')]/li[1]/text()"
# exit 0

# parse using XPath
declare -a links csums
eval "$( \
    echo "${html_data}" | xidel - \
      --silent \
      --output-format bash \
      --extract "links:=//div[contains(@class, 'ctx-dl-content')]//a[contains(@class, 'ctx-dl-link') and @rel]/@rel" \
      --extract "csums:=//div[contains(@class, 'ctx-dl-content')]//ul[contains(@class, 'ctx-checksum-list')]/li[1]/text()" \
)"

# ensure every link has a checksum
if [[ "${!links[*]}" != "${!csums[*]}" ]]; then
    echo "Links and Checksums don't match up!" >&2
    exit 1
fi

# postprocess data
declare -A citrix_data
for key in "${!links[@]}"; do
    link="${links["${key}"]}"

    # if link starts with "//" (no protocol), assume https
    if [[ "${link}" == "//"* ]]; then
        link="https:${link}"
    fi

    # extract checksum only (64 hex digits)
    csum="$(echo "${csums["${key}"]}" | grep -Eo "\<[[:xdigit:]]{64}\>")"

    citrix_data["${csum}"]="${link}"
done

# remove intermediate containers
unset links csums

#########
# FUNCS #
#########

find_links() { # $filename_regex
    local link_regex="://downloads\.citrix\.com/[[:digit:]]+/${1}\?__gda__=exp=[[:digit:]]+~acl=[^~]+~hmac=[[:digit:]a-f]{64}$"

    for key in "${!citrix_data[@]}"; do
        if echo "${citrix_data["${key}"]}" | grep -E "${link_regex}" &>/dev/null; then
            echo "${key} ${citrix_data["${key}"]}"
        fi
    done
}

find_links_deb() { # $name $arch
    case "${2}" in
        x86_64) local arch="amd64" ;;
        arm64) local arch="arm64" ;;
        *) local arch="${2}" ;;
    esac

    find_links "${1}_[[:digit:]\.]+_${arch}\.deb"
}

find_links_rpm() { # $name $flavor $arch
    find_links "${1}(:?-${2})?-[[:digit:]\.]+(:?-[[:digit:]]+)?.${3}\.rpm"
}

find_links_targz() { # $arch
    case "${1}" in
        x86_64) local arch="x64" ;;
        arm64) local arch="arm64" ;;
        *) local arch="${1}" ;;
    esac

    find_links "linux${arch}-[[:digit:]\.]+\.tar.gz"
}

# shellcheck disable=SC2155
list_all_links() {
    local debs="$(find_links_deb "[[:lower:]]+" "[[:alnum:]]+")"
    local debc="$(echo "${debs}" | wc -l)"
    echo "deb:"
    echo "${debs}"

    local rpms="$(find_links_rpm "[[:alpha:]]+" "[[:lower:]]+" "[[:alnum:]_]+")"
    local rpmc="$(echo "${rpms}" | wc -l)"
    echo "rpm:"
    echo "${rpms}"

    local tars="$(find_links_targz "[[:alnum:]]+")"
    local tarc="$(echo "${tars}" | wc -l)"
    echo "tar.gz:"
    echo "${tars}"

    local anys="$(find_links "[[:alnum:]\._-]+")"
    local anyc="$(echo "${anys}" | wc -l)"
    echo "any:"
    echo "${anys}"

    if [ $(( debc + rpmc + tarc )) -ne $(( anyc )) ]; then
        echo "Not all links matched!" >&2
        exit 1
    fi
}

install_deb() { # $name
    needs_commands "dpkg-query" "zenity" "notify-send" "gdebi-gtk" || return 1

    local arch
    arch="$(uname -m)"
    echo "Trying to install ${1} DEB for ${arch}" >&2

    local link
    if ! link="$(find_links_deb "${1}" "${arch}")"; then
        echo "No DEB found!" >&2
        return 1
    elif [ "$(echo "${link}" | wc -l)" -ne 1 ]; then
        echo "More than one DEB found!" >&2
        return 1
    fi

    local csum
    csum="$(echo "${link}" | cut -d' ' -f1)"
    link="$(echo "${link}" | cut -d' ' -f2)"

    local version_available
    version_available="$(echo "${link}" | sed -r 's/^.*\/[^_]+_([[:digit:]\.]+)_[^\.]+\.deb.*$/\1/')"

    local version_installed
    if version_installed="$(dpkg-query --show --showformat='${Version}\n' "${1}")" \
    && [ "${version_available}" = "${version_installed}" ]; then
        echo "Newest version already installed!" >&2
        notify-send \
          --app-name "citrix-update" \
          --icon "info" \
          "Citrix Update" \
          "Citrix \"${1}\": Newest version is installed!"
        sleep 2

        return 0
    fi

    if ! zenity \
      --question \
      --title="New Version Available" \
      --text="<span size=\"xx-large\">Citrix Upgrade Available!</span>\n\nInstall ${1} version <b>${version_available}</b> now?"; then
        echo "Installation of ${1} cancelled!" >&2
        return 0
    fi

    local destfile
    destfile="$(mktemp --tmpdir "XXXXX_${1}_${version_available}.deb")"
    
    if download_gui "${link}" "${destfile}" "${csum}"; then
        echo "Download for ${1} successful!" >&2
        gdebi-gtk "${destfile}"
    fi

    rm -f "${destfile}"
    echo "Cleaned up '${destfile}'" >&2
    return 0
}

########
# MAIN #
########

list_all_links > /dev/null

if has_command "apt"; then
    install_deb "icaclient" || exit 1
    install_deb "ctxusb" || exit 1
fi

exit 0