#!/usr/bin/env bash

set -e
export LC_CTYPE=C
export LC_ALL=C

bw_logout() {
    bw logout &>/dev/null || true
}

# environment variables
# BW_AUTH_METHOD=${BW_AUTH_METHOD:-"password"}
BW_AUTH_METHOD=${BW_AUTH_METHOD:-"apikey"}
BW_CLIENT_ID=${BW_CLIENT_ID:-"fake_client_id"}
BW_APIKEY=${BW_APIKEY:-"fake_apikey"}

BW_ACCOUNT=${BW_ACCOUNT:-"fake_account"}
BW_PASS=${BW_PASS:-"fake_password"}
BW_FILENAME_PREFIX=${BW_FILENAME_PREFIX:-"bitwarden_vault_export_"}
BW_TIMESTAMP=${BW_TIMESTAMP:-"+%Y-%m-%d %H:%M:%S"}
BW_EXPORT_FOLDER=${BW_EXPORT_FOLDER:-"/export"}
BW_FOLDER_STRUCTURE=${BW_FOLDER_STRUCTURE:-"+%Y/%m"}
BW_PASSWORD_ENCODE=${BW_PASSWORD_ENCODE:-"base64"}
BW_OPENSSL_OPTIONS=${BW_OPENSSL_OPTIONS:-"-aes-256-cbc -pbkdf2 -iter 100000"}
BW_ENCRYPTION_PASS=${BW_ENCRYPTION_PASS:-"$BW_PASS"}

# construct internal variables
BW_INTERNAL_TIMESTAMP=$(date "$BW_TIMESTAMP")
BW_INTERNAL_PASSWORD="$BW_PASS"
BW_INTERNAL_ENCRYPTION_PASS="$BW_ENCRYPTION_PASS"
BW_INTERNAL_API_KEY="$BW_APIKEY"
BW_INTERNAL_FOLDER_STRUCTURE="$BW_EXPORT_FOLDER"
BW_ENC_OUTPUT_FILE="$BW_FILENAME_PREFIX$BW_INTERNAL_TIMESTAMP.enc"
if [ -n "$BW_FOLDER_STRUCTURE" ]; then
    BW_INTERNAL_FOLDER_STRUCTURE="$BW_INTERNAL_FOLDER_STRUCTURE/$(date "$BW_FOLDER_STRUCTURE")"
    mkdir -p "$BW_INTERNAL_FOLDER_STRUCTURE"
    BW_ENC_OUTPUT_FILE="$BW_INTERNAL_FOLDER_STRUCTURE/$BW_ENC_OUTPUT_FILE"
fi

# we need to control the session so we're making sure to logout if we are logged in
bw_logout

case $BW_PASSWORD_ENCODE in

"base64")
    BW_INTERNAL_PASSWORD=$(echo "$BW_INTERNAL_PASSWORD" | base64 -d)
    BW_INTERNAL_ENCRYPTION_PASS=$(echo "$BW_INTERNAL_ENCRYPTION_PASS" | base64 -d)
    BW_INTERNAL_API_KEY=$(echo "$BW_INTERNAL_API_KEY" | base64 -d)
    ;;
"none" | "plain")
    echo "using un-encoded password."
    ;;

*)
    echo "unrecognized encoding method. Aborting."
    exit 1
    ;;
esac

#login
case $BW_AUTH_METHOD in

"password")
    BW_SESSION=$(bw login "$BW_ACCOUNT" "$BW_INTERNAL_PASSWORD" --raw)
    ;;
"apikey")

    export BW_CLIENT_ID=$BW_CLIENT_ID
    export BW_INTERNAL_API_KEY=$BW_INTERNAL_API_KEY
    expect >/dev/null <<'EOF'
        spawn bw login --apikey
        expect "client_id:"
        send "$env(BW_CLIENT_ID)\n" 
        expect "client_secret:"
        send "$env(BW_INTERNAL_API_KEY)\n" 
        expect eof
EOF

    BW_SESSION=$(bw unlock --raw "$BW_INTERNAL_PASSWORD")
    ;;
*)
    echo "unrecognized authorization method."
    exit 1
    ;;
esac

# commands
echo "Exporting to \"$BW_ENC_OUTPUT_FILE\""
bw --raw --session "$BW_SESSION" export --format json | openssl enc $BW_OPENSSL_OPTIONS -k "$BW_INTERNAL_ENCRYPTION_PASS" -out "$BW_ENC_OUTPUT_FILE"
bw_logout

# make sure none of these are available later
unset BW_CLIENT_ID
unset BW_APIKEY
unset BW_INTERNAL_API_KEY
unset BW_SESSION
unset BW_ACCOUNT
unset BW_PASS
unset BW_INTERNAL_PASSWORD
unset BW_ENCRYPTION_PASS
unset BW_INTERNAL_ENCRYPTION_PASS