#!/bin/bash
PROGRAM="$(basename $0)"
source $AK_LIBDIR/_ak_log
source $AK_LIBDIR/_ak_ipfs
source $AK_LIBDIR/_ak_gpg

if [ ! -d $AK_WORKDIR/ipfs ]
then
    mkdir $AK_WORKDIR/ipfs
fi

if [ ! -z $1 ] && [ ! -z $2 ]
then
    echo -n "$1" | grep -e 'Qm.\{44\}' >/dev/null
    if [ $? -ne 0 ]
    then
        _ak_log_error "Invalid hash format for $1"
        exit 1
    fi
    _ak_ipfs_cat $1 > /dev/null
    if [ $? -ne 0 ]
    then
        _ak_log_error "Error while reading $1"
        exit 1
    fi
    _ak_ipfs_cat $1 | jq -M > /dev/null
    if [ $? -ne 0 ]
    then
        _ak_log_error "Error while parsing JSON for $1"
        exit 1
    fi
    _ak_ipfs_cat $1 | jq | grep ipfs > /dev/null
    if [ $? -ne 0 ]
    then
        _ak_log_error "Error while extracting data from JSON for $1"
        exit 1
    fi
    DATA="$(_ak_ipfs_cat $1 | jq | grep ipfs | sed -e 's/"ipfs": "//g; s/[",]//g; s/ //g')"
    if [ $? -ne 0 ]
    then
        _ak_log_error "Error while extracting data from JSON for $1"
        exit 1
    fi
    _ak_ipfs_cat $1 | jq | grep detach > /dev/null
    if [ $? -ne 0 ]
    then
        _ak_log_error "Error while extracting data from JSON for $1"
        exit 1
    fi
    DETACH="$(_ak_ipfs_cat $1 | jq | grep detach | sed -e 's/"detach": "//g; s/[",]//g; s/ //g')"
    if [ $? -ne 0 ]
    then
        _ak_log_error "Error while extracting data from JSON for $1"
        exit 1
    fi
    echo -n "$2" | grep -e 'Qm.\{44\}' >/dev/null
    if [ $? -ne 0 ]
    then
        _ak_log_error "Invalid hash format for $2"
        exit 1
    fi
    gpg="$2"
    _ak_ipfs_get $gpg > /dev/null 2>&1
    if [ $? -ne 0 ]
    then
    _ak_log_error "Could not get GPG key: $gpg"
    exit 1
    fi
    _ak_gpg_key_import_from_file $gpg > /dev/null 2>&1
    if [ $? -ne 0 ]
    then
        _ak_log_error "Could not import GPG key: $gpg"
        exit 1
    fi
    _ak_ipfs_get $DETACH > /dev/null 2>&1
    if [ $? -ne 0 ]
    then
        _ak_log_error "Error while getting signature: $DETACH for data: $DATA"
        exit 1
    fi
    mv $DETACH $DATA.asc
    _ak_log_info "Block signature downloaded"
    _ak_ipfs_get $DATA > /dev/null 2>&1
    if [ $? -ne 0 ]
    then
        _ak_log_error "Error while getting data: $DATA"
        exit 1
    fi
    _ak_log_info "Data downloaded: $DATA"
    _ak_gpg_verify_signature $DATA.asc $DATA > /dev/null 2>&1
    if [ $? -ne 0 ]
    then
        _ak_log_error "Error while verifying signature for $DATA"
        exit 1
    fi
    mv $DATA $AK_WORKDIR/ipfs
    _ak_log_info "Block signature verified"
    echo -n '"data":"'$1'","'$1'":'$(_ak_ipfs_cat $1|jq -M -c)','
    exit 0
else
    echo "Usage: $PROGRAM HASH GPG"
    exit 1
fi