step.sh

#!/bin/bash
#set -ex

#=======================================
# Validations
#=======================================

validateApkName(){
    if [[ -z "${apk_name// }" ]]; then
        apk_name="universal"
    fi
    apk_name="${apk_name//.apk}"
} 

#=======================================
# Main
#=======================================

#step_path="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
temp_path=$PWD

echo "building universal apk path"
echo "Getting app bundle from ${aab_path}"
echo "Signing with ${keystore_url} key and alias ${keystore_alias}"
validateApkName
echo "apk name ${apk_name}"

bundletool="${temp_path}/bundletool.jar"
keystore="${temp_path}/keystore.jks"
source="https://github.com/google/bundletool/releases/download/0.8.0/bundletool-all-0.8.0.jar"

# Building
aab_output_path="${temp_path}/output/bundle"
aab_output="${aab_output_path}/${apk_name}.apks"
apk_output_path="${temp_path}/output/apk"
apk_output="${apk_output_path}/${apk_name}.apk"

mkdir -p "${aab_output_path}" &
mkdir -p "${apk_output_path}" &
wait

echo "Downloading keystore"
curl -o "keystore.jks" "${keystore_url}" 
wait

echo "Downloading bundle tool"
wget -nv "${source}" --output-document="${bundletool}" &
wait

echo "Extracting bundle apks"
exec java -jar "${bundletool}" build-apks --bundle="${aab_path}" --output="${aab_output}" --mode=universal --ks=${keystore} --ks-pass=pass:"${keystore_password}" --ks-key-alias="${keystore_alias}" --key-pass=pass:"${keystore_alias_password}" &
wait
echo "APK created in ${apk_output_path}"
exec unzip ${aab_output} -d ${apk_output_path} &
wait

# rename universal.apk to the given name
mv ${apk_output_path}/universal.apk ${apk_output} &
wait

# move the apk to the alternative output path
if [[ -n "${apk_output_dir// }" ]]; then
        mv ${apk_output} ${apk_output_dir}/${apk_name}.apk &
        apk_output="${apk_output_dir}/${apk_name}.apk"
        apk_output_path="${apk_output_dir}"
fi
wait

envman add --key BITRISE_APK_PATH --value ${apk_output}
envman add --key BITRISE_APK_DIR --value ${apk_output_path}

exit 0