Validate IBC client update proposal

validate_ibc_client_update_proposal.sh

#!/bin/bash

# needs the given block height states available on the reference chain (RPC)

PROP_ID=$1
HOST_CHAIN_LCD=$2
REF_CHAIN_RPC=$3

COL_RED='\033[0;31m'
COL_GREEN='\033[0;32m'
COL_NC='\033[0m'

echo "running validate_ibc_client_update_proposal.sh..."
HELP=false
while getopts ":h" option ; do
	case $option in
        h) HELP=true                                        ;;
        \?) echo "Invalid option -$OPTARG" >&2 && HELP=true ;;
	esac
done

# check input, remove trailing slashes
if [ -z "$1" ] || [ -z "$2" ] || [ -z "$3" ] ; then
    HELP=true;
fi
if [[ "${HOST_CHAIN_LCD: -1}" == "/" ]] ; then
    HOST_CHAIN_LCD="${HOST_CHAIN_LCD::-1}"
fi
if [[ "${REF_CHAIN_RPC: -1}" == "/" ]] ; then
    REF_CHAIN_RPC="${REF_CHAIN_RPC::-1}"
fi

if $HELP ; then
    echo 'Usage: ./validate_ibc_client_update_proposal.sh <PROPOSAL_ID> <HOST_CHAIN_REST_ENDPOINT> <REFERENCE_CHAIN_RPC_ENDPOINT>
-h        print help message' 
    exit
fi

check_endpoints() {
    TEST_LCD=$(curl -s --connect-timeout 3 $HOST_CHAIN_LCD)
    if [ -z "$TEST_LCD" ] ; then
        echo "error fetching HOST_CHAIN_REST_ENDPOINT: $HOST_CHAIN_LCD" >&2 
        exit 1        
    fi
    TEST_RPC=$(curl -s --connect-timeout 3 $REF_CHAIN_RPC)
    if [ -z "$TEST_RPC" ] ; then
        echo "error fetching REFERENCE_CHAIN_RPC_ENDPOINT: $REF_CHAIN_RPC" >&2 
        exit 1
    fi
}

fetch_prop_data() {
    PROP_DATA=$(curl --connect-timeout 3 -s $HOST_CHAIN_LCD/cosmos/gov/v1beta1/proposals/$PROP_ID) 
    TITLE=$(echo $PROP_DATA | jq -r '.proposal.content.title')
    if [ ! -z "$TITLE" ] ; then 
        SUBJ_CLIENT_ID=$(echo $PROP_DATA | jq -r '.proposal.content.subject_client_id')
        SUBS_CLIENT_ID=$(echo $PROP_DATA | jq -r '.proposal.content.substitute_client_id')
    else
        echo "error fetching proposal, check proposal ID: $PROP_ID" >&2 
        exit 1        
    fi
}

fetch_client_states() {
    echo "fetching ibc client states..."
    SUBJ_CLIENT_HEIGHT=$(curl --connect-timeout 3 -s $HOST_CHAIN_LCD/ibc/core/client/v1/client_states/$SUBJ_CLIENT_ID | jq -r '.client_state.latest_height.revision_height') 
    SUBJ_CLIENT_REVNUM=$(curl --connect-timeout 3 -s $HOST_CHAIN_LCD/ibc/core/client/v1/client_states/$SUBJ_CLIENT_ID | jq -r '.client_state.latest_height.revision_number') 
    SUBJ_CLIENT_VALSET_NEXTHASH=$(curl --connect-timeout 3 -s $HOST_CHAIN_LCD/ibc/core/client/v1/consensus_states/$SUBJ_CLIENT_ID/revision/$SUBJ_CLIENT_REVNUM/height/$SUBJ_CLIENT_HEIGHT | jq -r '.consensus_state.next_validators_hash') 

    SUBS_CLIENT_HEIGHT=$(curl --connect-timeout 3 -s $HOST_CHAIN_LCD/ibc/core/client/v1/client_states/$SUBS_CLIENT_ID | jq -r '.client_state.latest_height.revision_height')
    SUBS_CLIENT_REVNUM=$(curl --connect-timeout 3 -s $HOST_CHAIN_LCD/ibc/core/client/v1/client_states/$SUBS_CLIENT_ID | jq -r '.client_state.latest_height.revision_number') 
    SUBS_CLIENT_VALSET_NEXTHASH=$(curl --connect-timeout 3 -s $HOST_CHAIN_LCD/ibc/core/client/v1/consensus_states/$SUBS_CLIENT_ID/revision/$SUBS_CLIENT_REVNUM/height/$SUBS_CLIENT_HEIGHT | jq -r '.consensus_state.next_validators_hash') 
}

fetch_valsets() {
    echo "fetching block data on reference chain..."
    REF_SUBJ_CLIENT_VALSET_NEXTHASH=$(curl --connect-timeout 3 -s $REF_CHAIN_RPC'/block?height='$SUBJ_CLIENT_HEIGHT | jq -r '.result.block.header.next_validators_hash')
    REF_SUBS_CLIENT_VALSET_NEXTHASH=$(curl --connect-timeout 3 -s $REF_CHAIN_RPC'/block?height='$SUBS_CLIENT_HEIGHT | jq -r '.result.block.header.next_validators_hash')
}


print_results() {
    echo "----------------------------------"
    echo "title: $TITLE"
    echo ">>> subject client id: $SUBJ_CLIENT_ID - last revision: $SUBJ_CLIENT_REVNUM height: $SUBJ_CLIENT_HEIGHT"
    echo "host: $SUBJ_CLIENT_VALSET_NEXTHASH | reference: $REF_SUBJ_CLIENT_VALSET_NEXTHASH"
    echo "<<< substit client id: $SUBS_CLIENT_ID - last revision: $SUBS_CLIENT_REVNUM height: $SUBS_CLIENT_HEIGHT"
    echo "host: $SUBS_CLIENT_VALSET_NEXTHASH | reference: $REF_SUBS_CLIENT_VALSET_NEXTHASH"
    echo "----------------------------------"
}

validate_hashes() {
    VAL_SUBJ_CLIENT=$(diff -s <(echo $SUBJ_CLIENT_VALSET_NEXTHASH) <(echo $REF_SUBJ_CLIENT_VALSET_NEXTHASH))
    VAL_SUBS_CLIENT=$(diff -s <(echo $SUBS_CLIENT_VALSET_NEXTHASH) <(echo $REF_SUBS_CLIENT_VALSET_NEXTHASH))
    if [[ $VAL_SUBJ_CLIENT == *"are identical"* ]] ; then
        echo -e "${COL_GREEN}\U2705 subject client valid! ${COL_NC}"
    else
        echo -e "${COL_RED}\U274C subject client NOT VALID! \U274C ${COL_NC}"
    fi
    if [[ $VAL_SUBS_CLIENT == *"are identical"* ]] ; then
        echo -e "${COL_GREEN}\U2705 substitute client valid! ${COL_NC}"
    else
        echo -e "${COL_RED}\U274C substitute client NOT VALID! \U274C ${COL_NC}"
    fi
}

main() {
    check_endpoints
    fetch_prop_data
    fetch_client_states
    fetch_valsets
    print_results
    validate_hashes
}

main