#!/bin/bash
PROGRAM="$(basename $0)"
if [ ! -d $AK_WORKDIR/ipfs ]
then
    mkdir $AK_WORKDIR/ipfs
fi
logit(){
	ak-logthis "$PROGRAM" "$1" "$2"
}
if [ ! -z "$1" ] && [ ! -z "$2" ]
then
	echo -n "$1" | grep -e 'Qm.\{44\}' >/dev/null
	if [ "$?" -ne 0 ]
	then
		logit "ERROR" "Invalid hash format for $1"
		exit 1
	fi
	ak-ipfs-cat $1 > /dev/null
	if [ "$?" -ne 0 ]
	then
		logit "ERROR" "Error while reading $1"
		exit 1
	fi
	ak-ipfs-cat $1 | jq -M > /dev/null
	if [ "$?" -ne 0 ]
	then
		logit "ERROR" "Error while parsing JSON for $1"
		exit 1
	fi
	ak-ipfs-cat $1 | jq | grep ipfs > /dev/null
	if [ "$?" -ne 0 ]
	then
		logit "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
		logit "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
		logit "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
		logit "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
	    logit "ERROR" "Invalid hash format for $2"
	    exit 1
	fi
    gpg="$2"
    ak-ipfs-get $gpg > /dev/null 2>&1
    if [ "$?" -ne 0 ]
    then
	logit "ERROR" "Could not get GPG key: $gpg"
	exit 1
    fi
    gpg2 --homedir $AK_GPGHOME --import $gpg > /dev/null 2>&1
    if [ "$?" -ne 0 ]
    then
		logit "ERROR" "Could not import GPG key: $gpg"
		exit 1
	fi
	ak-ipfs-get $DETACH > /dev/null 2>&1
	if [ "$?" -ne 0 ]
	then
		logit "ERROR" "Error while getting signature: $DETACH for data: $DATA"
		exit 1
	fi
	mv $DETACH $DATA.asc
	logit "INFO" "Block signature downloaded"
	ak-ipfs-get $DATA > /dev/null 2>&1
	if [ "$?" -ne 0 ]
	then
		logit "ERROR" "Error while getting data: $DATA"
		exit 1
	fi
	logit "INFO" "Data downloaded: $DATA"
	gpg2 --homedir $AK_GPGHOME --verify $DATA.asc $DATA > /dev/null 2>&1
	if [ "$?" -ne 0 ]
	then
		logit "ERROR" "Error while verifying signature for $DATA"
		exit 1
	fi
    mv $DATA $AK_WORKDIR/ipfs
	logit "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