#!/usr/bin/env bash
#-------------------------------------------------------------------------------------------------------------
# Copyright (c) Microsoft Corporation. All rights reserved.
# Licensed under the MIT License. See https://go.microsoft.com/fwlink/?linkid=2090316 for license information.
#-------------------------------------------------------------------------------------------------------------
#
# Docs: https://github.com/microsoft/vscode-dev-containers/blob/main/script-library/docs/awscli.md
# Maintainer: The VS Code and Codespaces Teams
#
# Syntax: ./awscli-debian.sh [AWS CLI version]

set -e

AWSCLI_VERSION=${1:-"latest"}
AWSCLI_GPG_KEY=FB5DB77FD5C118B80511ADA8A6310ACC4672475C
AWSCLI_GPG_KEY_MATERIAL="-----BEGIN PGP PUBLIC KEY BLOCK-----

mQINBF2Cr7UBEADJZHcgusOJl7ENSyumXh85z0TRV0xJorM2B/JL0kHOyigQluUG
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YLZATHZKTJyiqA==
=vYOk
-----END PGP PUBLIC KEY BLOCK-----"

if [ "$(id -u)" -ne 0 ]; then
    echo -e 'Script must be run as root. Use sudo, su, or add "USER root" to your Dockerfile before running this script.'
    exit 1
fi

# Get central common setting
get_common_setting() {
    if [ "${common_settings_file_loaded}" != "true" ]; then
        curl -sfL "https://aka.ms/vscode-dev-containers/script-library/settings.env" 2>/dev/null -o /tmp/vsdc-settings.env || echo "Could not download settings file. Skipping."
        common_settings_file_loaded=true
    fi
    if [ -f "/tmp/vsdc-settings.env" ]; then
        local multi_line=""
        if [ "$2" = "true" ]; then multi_line="-z"; fi
        local result="$(grep ${multi_line} -oP "$1=\"?\K[^\"]+" /tmp/vsdc-settings.env | tr -d '\0')"
        if [ ! -z "${result}" ]; then declare -g $1="${result}"; fi
    fi
    echo "$1=${!1}"
}

# Function to run apt-get if needed
apt_get_update_if_needed()
{
    if [ ! -d "/var/lib/apt/lists" ] || [ "$(ls /var/lib/apt/lists/ | wc -l)" = "0" ]; then
        echo "Running apt-get update..."
        apt-get update
    else
        echo "Skipping apt-get update."
    fi
}

# Checks if packages are installed and installs them if not
check_packages() {
    if ! dpkg -s "$@" > /dev/null 2>&1; then
        apt_get_update_if_needed
        apt-get -y install --no-install-recommends "$@"
    fi
}

export DEBIAN_FRONTEND=noninteractive

check_packages curl ca-certificates gnupg2 dirmngr unzip

verify_aws_cli_gpg_signature() {
    local filePath=$1
    local sigFilePath=$2

    get_common_setting AWSCLI_GPG_KEY
    get_common_setting AWSCLI_GPG_KEY_MATERIAL true
    local awsGpgKeyring=aws-cli-public-key.gpg

    echo "${AWSCLI_GPG_KEY_MATERIAL}" | gpg --dearmor > "./${awsGpgKeyring}"
    gpg --batch --quiet --no-default-keyring --keyring "./${awsGpgKeyring}" --verify "${sigFilePath}" "${filePath}"
    local status=$?

    rm "./${awsGpgKeyring}"

    return ${status}
}

install() {
    local scriptZipFile=awscli.zip
    local scriptSigFile=awscli.sig

    # See Linux install docs at https://docs.aws.amazon.com/cli/latest/userguide/getting-started-install.html
    if [ "${AWSCLI_VERSION}" != "latest" ]; then
        local versionStr=-${AWSCLI_VERSION}
    fi
    architecture=$(dpkg --print-architecture)
    case "${architecture}" in
        amd64) architectureStr=x86_64 ;;
        arm64) architectureStr=aarch64 ;;
        *)
            echo "AWS CLI does not support machine architecture '$architecture'. Please use an x86-64 or ARM64 machine."
            exit 1
    esac
    local scriptUrl=https://awscli.amazonaws.com/awscli-exe-linux-${architectureStr}${versionStr}.zip
    curl "${scriptUrl}" -o "${scriptZipFile}"
    curl "${scriptUrl}.sig" -o "${scriptSigFile}"

    verify_aws_cli_gpg_signature "$scriptZipFile" "$scriptSigFile"
    if (( $? > 0 )); then
        echo "Could not verify GPG signature of AWS CLI install script. Make sure you provided a valid version."
        exit 1
    fi

    unzip "${scriptZipFile}"
    ./aws/install

    rm -rf ./aws
}

echo "(*) Installing AWS CLI..."

install

echo "Done!"