Added Policy-Option to mint/burn with Time(Slot)-Limit

New Option added to script 10_genPolicy.sh which allows users to generate Tokens in a limited TimeWindow -> Fixed amount of Tokens. Policy is automatically invalid after a given Time-Period (Slots)

Author: gitmachtl

cardano/testnet/10_genPolicy.sh

@@ -10,15 +10,30 @@
 #       cardanonode     Path to the cardano-node executable
 . "$(dirname "$0")"/00_common.sh
 
-if [[ $# -eq 1 && ! $1 == "" ]]; then policyName=$1; else echo "ERROR - Usage: $0 <PolicyName>"; exit 2; fi
+case $# in
+
+  1|2 ) policyName=$1;;
+
+  * ) cat >&2 <<EOF
+Usage:    $(basename $0) <PolicyName> [Optional valid xxx Slots, Policy invalid after xxx Slots (default=unlimited)]
+
+
+Example:  $(basename $0) assets/mypolicy 600
+
+          This would generate Policy 'mypolicy' in the folder 'assets' limited to 600 Slots (600 Seconds) from now.
+          No Token minting or burning would be possible after that time, starting now!
+
+EOF
+  exit 1;; esac
+
+if [[ $# -eq 2 && $2 -gt 0 ]]; then validBefore=$(( $(get_currentTip) + ${2} )); else validBefore="unlimited"; fi
 
 #warnings
 if [ -f "${policyName}.policy.vkey" ]; then echo -e "\e[35mWARNING - ${policyName}.policy.vkey already present, delete it or use another name !\e[0m"; exit 2; fi
 if [ -f "${policyName}.policy.skey" ]; then echo -e "\e[35mWARNING - ${policyName}.policy.skey already present, delete it or use another name !\e[0m"; exit 2; fi
 if [ -f "${policyName}.policy.script" ]; then echo -e "\e[35mWARNING - ${policyName}.policy.script already present, delete it or use another name !\e[0m"; exit 2; fi
 if [ -f "${policyName}.policy.id" ]; then echo -e "\e[35mWARNING - ${policyName}.policy.id already present, delete it or use another name !\e[0m"; exit 2; fi
 
-
 #Check if the destination directory for the policy exists, if not, try to make it
 policyDirName="$(dirname ${policyName})"; policyDirName=${policyDirName/#.\//};
 if [ ! -d "${policyDirName}" ]; then mkdir -p ${policyDirName}; checkError "$?"; fi
@@ -36,7 +51,18 @@ cat ${policyName}.policy.skey | jq
 echo
 
 policyKeyHASH=$(${cardanocli} address key-hash --payment-verification-key-file ${policyName}.policy.vkey)
-echo "{ \"keyHash\": \"${policyKeyHASH}\", \"type\": \"sig\" }" > ${policyName}.policy.script
+
+currentTip=$(get_currentTip)
+echo -e "\e[0mCurrent Slot-Height:\e[32m ${currentTip} \e[0m"
+echo -e "\e[0mPolicy valid before Slot-Height:\e[33m ${validBefore}\e[0m"
+echo
+
+#Write out an unlimited SigningScript or a limited one
+if [[ "${validBefore}" == "unlimited" ]]; then
+					  echo "{ \"keyHash\": \"${policyKeyHASH}\", \"type\": \"sig\" }" > ${policyName}.policy.script
+					  else
+					  echo "{ \"type\": \"all\", \"scripts\": [ { \"slot\": ${validBefore}, \"type\": \"before\" }, { \"keyHash\": \"${policyKeyHASH}\", \"type\": \"sig\" } ] }" > ${policyName}.policy.script
+fi
 echo -e "\e[0mPolicy-Script: \e[32m ${policyName}.policy.script \e[90m"
 file_lock ${policyName}.policy.script
 cat ${policyName}.policy.script | jq

cardano/testnet/11a_mintAsset.sh

@@ -55,15 +55,20 @@ fi
 rxcnt="1"
 
 echo -e "\e[0mMinting Asset \e[32m${assetMintAmount} '${assetMintName}'\e[0m with Policy \e[32m'${policyName}'\e[0m:"
-echo
 
 #get live values
 currentTip=$(get_currentTip)
-ttl=$(get_currentTTL)
-currentEPOCH=$(get_currentEpoch)
 
+#set timetolife (inherent hereafter) to the currentTTL or to the value set in the policy.script for the "before" slot (limited policy lifespan)
+ttlFromScript=$(cat ${policyName}.policy.script | jq -r ".scripts[] | select(.type == \"before\") | .slot" 2> /dev/null || echo "unlimited")
+if [[ ! ${ttlFromScript} == "unlimited" ]]; then ttl=${ttlFromScript}; else ttl=$(get_currentTTL); fi
+echo
+echo -e "\e[0mPolicy valid before Slot-Height:\e[33m ${ttlFromScript}\e[0m"
+echo
 echo -e "\e[0mCurrent Slot-Height:\e[32m ${currentTip} \e[0m(setting TTL[invalid_hereafter] to ${ttl})"
 echo
+if [[ ${ttl} -le ${currentTip} ]]; then echo -e "\e[35mError - Your given Policy has expired, you cannot use it anymore!\e[0m\n"; exit 2; fi
+
 
 sendFromAddr=$(cat ${fromAddr}.addr)
 sendToAddr=${sendFromAddr}
@@ -214,7 +219,7 @@ if ask "\e[33mDoes this look good for you, continue ?" N; then
 			        if [ ! -f "${assetFileName}" ]; then echo "{}" > ${assetFileName}; fi #generate an empty json if no file present
 			        oldValue=$(jq -r ".minted" ${assetFileName})
 			        newValue=$(( ${oldValue} + ${assetMintAmount} ))
-			        assetFileJSON=$( jq ". += {minted: ${newValue}, name: \"${assetMintName}\", policyID: \"${policyID}\", lastUpdate: \"$(date)\", lastAction: \"mint ${assetMintAmount}\"}" < ${assetFileName})
+			        assetFileJSON=$( jq ". += {minted: ${newValue}, name: \"${assetMintName}\", policyID: \"${policyID}\", policyValidBeforeSlot: \"${ttlFromScript}\", lastUpdate: \"$(date)\", lastAction: \"mint ${assetMintAmount}\"}" < ${assetFileName})
 
 			        file_unlock ${assetFileName}
 			        echo -e "${assetFileJSON}" > ${assetFileName}
@@ -247,7 +252,7 @@ if ask "\e[33mDoes this look good for you, continue ?" N; then
 			                                if [ ! -f "${assetFileName}" ]; then echo "{}" > ${assetFileName}; fi #generate an empty json if no file present
 			                                oldValue=$(jq -r ".minted" ${assetFileName})
 			                                newValue=$(( ${oldValue} + ${assetMintAmount} ))
-			                                assetFileJSON=$( jq ". += {minted: ${newValue}, name: \"${assetMintName}\", policyID: \"${policyID}\", lastUpdate: \"$(date)\", lastAction: \"mint ${assetMintAmount}\"}" < ${assetFileName})
+			                                assetFileJSON=$( jq ". += {minted: ${newValue}, name: \"${assetMintName}\", policyID: \"${policyID}\", policyValidBeforeSlot: \"${ttlFromScript}\", lastUpdate: \"$(date)\", lastAction: \"mint ${assetMintAmount}\"}" < ${assetFileName})
 
 			                                file_unlock ${assetFileName}
 			                                echo -e "${assetFileJSON}" > ${assetFileName}

cardano/testnet/11b_burnAsset.sh

@@ -56,15 +56,20 @@ fi
 rxcnt="1"
 
 echo -e "\e[0mBurning Asset \e[32m${assetBurnAmount} '${assetBurnName}'\e[0m with Policy \e[32m'${policyName}'\e[0m:"
-echo
 
 #get live values
 currentTip=$(get_currentTip)
-ttl=$(get_currentTTL)
-currentEPOCH=$(get_currentEpoch)
 
+#set timetolife (inherent hereafter) to the currentTTL or to the value set in the policy.script for the "before" slot (limited policy lifespan)
+ttlFromScript=$(cat ${policyName}.policy.script | jq -r ".scripts[] | select(.type == \"before\") | .slot" 2> /dev/null || echo "unlimited")
+if [[ ! ${ttlFromScript} == "unlimited" ]]; then ttl=${ttlFromScript}; else ttl=$(get_currentTTL); fi
+echo
+echo -e "\e[0mPolicy valid before Slot-Height:\e[33m ${ttlFromScript}\e[0m"
+echo
 echo -e "\e[0mCurrent Slot-Height:\e[32m ${currentTip} \e[0m(setting TTL[invalid_hereafter] to ${ttl})"
 echo
+if [[ ${ttl} -le ${currentTip} ]]; then echo -e "\e[35mError - Your given Policy has expired, you cannot use it anymore!\e[0m\n"; exit 2; fi
+
 
 sendFromAddr=$(cat ${fromAddr}.addr)
 sendToAddr=${sendFromAddr}