#!/bin/bash
PROGRAM="$(basename $0)"
logit(){
	logthis "<$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
	ipfs --timeout=10s cat $1 > /dev/null
	if [ "$?" -ne 0 ]
	then
		logit "[ERROR]" "Error while reading $1"
		exit 1
	fi
	ipfs --timeout=10s cat $1 | json_pp > /dev/null
	if [ "$?" -ne 0 ]
	then
		logit "[ERROR]" "Error while parsing JSON for $1"
		exit 1
	fi
	ipfs --timeout=10s cat $1 | jq | grep ipfs > /dev/null
	if [ "$?" -ne 0 ]
	then
		logit "[ERROR]" "Error while extracting data from JSON for $1"
		exit 1
	fi
	DATA="$(ipfs --timeout=10s 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
	ipfs --timeout=10s cat $1 | jq | grep detach > /dev/null
	if [ "$?" -ne 0 ]
	then
		logit "[ERROR]" "Error while extracting data from JSON for $1"
		exit 1
	fi
	DETACH="$(ipfs --timeout=10s 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"
    ipfs --timeout=10s get $gpg > /dev/null 2>&1
    if [ "$?" -ne 0 ]
    then
	logit "[ERROR]" "Could not get GPG key: $gpg"
	exit 1
    fi
    gpg2 --import $gpg > /dev/null 2>&1
    if [ "$?" -ne 0 ]
    then
		logit "[ERROR]" "Could not import GPG key: $gpg"
		exit 1
	fi
	ipfs --timeout=10s 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"
	ipfs --timeout=10s 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 --verify $DATA.asc $DATA > /dev/null 2>&1
	if [ "$?" -ne 0 ]
	then
		logit "[ERROR]" "Error while verifying signature for $DATA"
		exit 1
	fi
	logit "[INFO]" "Block signature verified"
    echo -n '"'$1'":{"ipfs":"'$DATA'","detach":"'$DETACH'"},'
	exit 0
else
	echo "Usage: $PROGRAM HASH GPG"
	exit 1
fi