#!/bin/bash

# ###
# Supprimer un message Cesium+
# ###

[[ ! -f .env ]] && cp .env.template .env
source .env

REGEX_PUBKEYS="[a-zA-Z0-9]{42,44}"

# Help display
helpOpt() {
    echo -e "Cesium+ messages deleting
    Default: ID in interactive mode.
    Advice: Fill your .env file for more fun.
    Example: $0 <ID du message>

    \rOptions:
    -id,--id <ID du message>\tDelete the message with ID <id>.
    -k,--key <key>\t\tPath <key> to the pubsec keychain file of the issuer.
    -o,--outbox\t\t\tDelete outbox messages instead of inbox
    -h,--help\t\t\tDisplay this help"
}

# Parse options
declare -a args=($@)
for ((i=0; i<${#args[*]}; ++i))
do
    case ${args[$i]} in
		-o|--outbox) type=outbox;;
        -id|--id) id="${args[$i+1]}"
            [[ -z $id ]] && echo "Veuillez préciser un ID de message." && exit 1;;
        -k|--key) DUNIKEY="${args[$i+1]}"
            [[ -z $DUNIKEY ]] && echo "Veuillez préciser un fichier de trousseau." && exit 1;;
        -h|--help) helpOpt && exit 0;;
        *) [[ "${args[$i]}" == "-"* ]] && echo "Option inconnue." && exit 1;;
    esac
done

if [[ -z $DUNIKEY ]]; then
    read -p "Fichier de trousseau: " DUNIKEY
fi
issuer=$(./natools.py pk -f pubsec -k $DUNIKEY)

if [[ -z $type ]]; then
    type="inbox"
fi
[[ -z $id ]] && id=$1
if [[ -z $id ]]; then
    read -p "ID de message: " ID
fi

[[ -z $(grep -Eo $REGEX_PUBKEYS <<<$issuer) ]] && echo "Le format de la clé publique de l'émetteur est invalide." && exit 1

times=$(date -u +'%s')

# Fabrication du hash
hashBrut="{\"version\":2,\"index\":\"message\",\"type\":\"$type\",\"id\":\"$id\",\"issuer\":\"$issuer\",\"time\":$times}"
hash=$(echo -n "$hashBrut" | sha256sum | cut -d ' ' -f1 | awk '{ print toupper($0) }')

# Fabrication de la signature
signature=$(echo -n "$hash" | ./natools.py sign -f pubsec -k $DUNIKEY --noinc -O 64)

document="{\"hash\":\"$hash\",\"signature\":\"$signature\",${hashBrut:1}"
jq . <<<$document

# Envoi du document
curl -s -X POST "$POD/history/delete" -d "$document"
echo