Downloads a chrome extension matching ExtensionID to ~/src/chrome-webstore-{ExtensionID}

chrome-webstore-dl.sh

#!/usr/bin/env bash
#
# Quinn Comendant <quinn@strangecode.com>
# 29 Sep 2017 16:09:21


#
# Functions
#

function usage() {
    echo "Usage: $(basename "$0") ExtensionID

Downloads a chrome extension matching ExtensionID
";
    exit 1;
}

function err {
    MSG="$1";
    IFS='';
    echo "$MSG" 1>&2
    exit 1;
}

function debug {
    MSG=$1;
    [[ -n $VERBOSE ]] && echo "$MSG" 1>&2
}

function prompt {
    MSG=$1;
    if [[ -n $ALWAYSYES ]]; then
        echo "$MSG (auto-continuing…)";
    else
        read -rp "$MSG [y/N]: " YN;
        case $YN in
        (y|Y);;
        (*) err "Nokay, exiting.";;
        esac
    fi
}


#
# Main
#

# Display help if run without arguments.
[[ $# == 0 ]] && usage && exit 0;

[[ $# != 1 ]] && echo "Invalid arguments. Run with no args for help." && exit 1;

extensionid=$1;
prodversion=$("$HOME/Applications/Google Chrome.app/Contents/MacOS/Google Chrome" --version | f3);
[[ -z $prodversion ]] && err "Failed to get Chrome version";

# Make dir in ~/src
tmpdir="$(mktemp -d "$HOME/src/chrome-webstore-${extensionid}")" || err "Download folder already exists";
trap 'rm -rf "$tmpdir"' INT HUP TERM;
cd "$tmpdir" || err "Failed to cd to $tmpdir";
# curl -Lo "${extensionid}.zip" "https://clients2.google.com/service/update2/crx?response=redirect&prodversion=60.0.3112.113&x=id%3D${extensionid}%26uc";
curl -Lo "${extensionid}.zip" "https://clients2.google.com/service/update2/crx?response=redirect&prodversion=${prodversion}&acceptformat=crx2,crx3&x=id%3D${extensionid}%26uc";
if [[ 0 != $? || ! -s "${extensionid}.zip" ]]; then
	err "Failed to download";
fi
unzip "${extensionid}.zip";
rm "${extensionid}.zip";
echo "Download complete: ~/src/chrome-webstore-${extensionid}";