#!/bin/bash
set -e

unix_seconds=$(date +%s)
key_path="$PWD/private_ed25519_${unix_seconds}"
signature_tag="file-integrity"
out_dir="$PWD/out"
inner_dir="$out_dir/contents"

mkdir -p "$inner_dir"

checkcode () {
    local retcode
    if [ -z "$1" ]; then
        echo -e "\n\e[31mERROR!\033[0m checkcode missing return code parameter\n"
        exit 1
    else
        retcode=$1
    fi

    if [ $retcode -ne 0 ]; then
        echo -e "\e[31mERROR!\033[0m Response Code: $retcode"
    else
        printf '\e[1;32mOK!\e[0m\n'
    fi
}

printf "ssh-keygen: makin new key "
ssh-keygen -t ed25519 -f "$key_path" -C "anonymous@local"
checkcode $?
printf "ssh-keygen: creating out/anonymous_signer"
echo "anonymous@local namespaces=\"$signature_tag\" $(cat "${key_path}.pub")" > "$out_dir/anonymous_signer"
checkcode $?

printf "random: adding 1/2 random blocks of data to inner archive"
dd if=/dev/urandom of="$inner_dir/.$RANDOM" bs=1M count=1 status=progress
checkcode $?
printf "random: adding 2/3 random blocks of data to outer archive"
dd if=/dev/urandom of="$out_dir/.$RANDOM" bs=1M count=1 status=progress
checkcode $?

printf "7z: compressing inner volume"
7z a "$out_dir/contents.7z" "$inner_dir"
checkcode $?

printf "ssh: signing out/contents.7z"
ssh-keygen -Y sign -f "$key_path" -n "$signature_tag" "$out_dir/contents.7z"
checkcode $?

printf "sha512: generating sha512 checksums of files in out/ "
(cd "$out_dir" && sha512sum * | tee checksums.sha512)
checkcode $?

echo "Enter attribution passphrase:"
read -r -s attribution_passphrase
echo
echo "Enter attribution passphrase again:"
read -r -s attribution_passphrase_check
if [[ "$attribution_passphrase" != "$attribution_passphrase_check" ]]; then
    echo -e "\n\n\033[0;31mAttribution passphrases do not match! Exiting!\033[0m\n\n" >&2
    exit 1
else
    echo -e "attribution_passphrase: \033[0;32mOK!\033[0m"
fi
unset attribution_passphrase_check
{
    printf '%s' "$attribution_passphrase"
    cat "$out_dir/contents.7z"
} | sha512sum | awk '{print $1}' | tee "$out_dir/attribution.sha512"

printf "deleting $inner_dir"
rm -rf "$inner_dir"
checkcode $?

printf "sanity checking"
# todo: test verify shit
checkcode $?

printf "7z archiving outer dir"
7z a "./out.7z" "$out_dir"
checkcode $?