A bash script to download chrome extension files from Chrome Web Store

getcrx.sh

#!/usr/bin/env bash
# A bash script to download chrome extension files from Chrome Web Store
# 30.12.2018, https://github.com/bitst0rm
# 23.07.2022 https://github.com/nicoandmee

# extensions.zip contains URLs to download

if [ ! -f ./extensions.txt ]; then
    echo "Missing extensions.txt file."
    echo "extensions.txt should contain newline delimited list of webstore links."
    exit 1
fi

# Pretty print
print () {
    if [ "$2" == "error" ] ; then
        COLOR="7;91m" # light red
    elif [ "$2" == "success" ] ; then
        COLOR="7;92m" # light green
    elif [ "$2" == "warning" ] ; then
        COLOR="7;33m" # yellow
    elif [ "$2" == "info" ] ; then
        COLOR="7;94m" # light blue
    else
        COLOR="0m" # colorless
    fi

    STARTCOLOR="\\e[$COLOR"
    ENDCOLOR="\\e[0m"

    printf "$STARTCOLOR%b$ENDCOLOR" "$1\\n"
}

case "$(uname -s)" in
    Linux*)     os=linux;;
    Darwin*)    os=mac;;
    *)          os=win;;
esac

case "$(uname -m)" in
    armv*)      arch=arm
                os_arch=arm
                nacl_arch=arm;;
    *64)        arch=x64
                os_arch=x86_64
                nacl_arch=x86-64;;
    *)          arch=x32
                os_arch=x86_32
                nacl_arch=x86-32;;
esac

c=0
while IFS='' read -r target || [ -n "${target}" ]; do
      # Check if it's a valid Chrome Web Store URL
    if [[ "$target" =~ ^https?://chrome\.google\.com/webstore/detail/ ]]; then
        # Check if the given URL exists
        if curl -sfI "$target" -o /dev/null; then
            ((c++))
            # Parse the extension ID of the given URL
            id=${target##*/}
            id=${id%\?*}
            # Parse the name of the extension from Chrome Web Store
            name=$(curl -s "$target" | sed -n 's/.*<meta property="og:title" content="\([^"]*\).*/\1/p')
            # Parse the version of the extension from HTTP headers
            # Tip: Use "chrome://net-internals/" to sniff the download url
            url='https://clients2.google.com/service/update2/crx?response=redirect'
            url+="&os=${os}"
            url+="&arch=${arch}"
            url+="&os_arch=${os_arch}"
            url+="&nacl_arch=${nacl_arch}"
            url+="&prod=chromiumcrx"
            url+="&prodchannel="
            url+="&prodversion=103.0.5060.114"
            url+="&lang=en"
            url+="&acceptformat=crx2,crx3"
            url+="&x=id%3D${id}%26installsource%3Dondemand%26uc"

            version=$(curl -sIL "$url" | sed -n 's/location:*//p' | sed -e 's/.*extension_\(.*\).crx/\1/')
            # Clean up filename
            file=$(echo "${name}_${version}.crx" | tr -s ' ' '-' | tr -d '\r\n' | sed -e 's/&amp;/\&/g' -e 's/[\/:*?"<>|]/_/g')
            # Download the extension file with corrected filename
            print "[${c}] Downloading ${file} ..." "success"
            curl -L "${url}" -o "${file}"
            # Unzip it for convenience
            print "[${c}] Unpacking ${file} ..." "info"
            dir="${file%.*}"
            unzip -o -q "${file}" -d "$dir"
            rm -f "${file}"
            # Beautify any html|css|js files
            print "[${c}] Beautifying source ..." "info"
            fd . "$dir" -e js -e json -e html -x js-beautify -r

        else
            print "[WARNING] URL does not exist: $target" "warning"
        fi
    else
        print "[WARNING] invalid URL: $target" "warning"
    fi
    print "\n"
done < ./extensions.txt