openchain-sdk-yxl-ts/lib/common/ctp.js

OpenChain SDK for browser

// CTP (Contract Token Protocol) implementation

export const ctp = {
  v10: `'use strict';let globalAttribute={};function globalAttributeKey(){return'global_attribute';}function loadGlobalAttribute(){if(Object.keys(globalAttribute).length===0){let value=storageLoad(globalAttributeKey());assert(value!==false,'Get global attribute from metadata failed.');globalAttribute=JSON.parse(value);}}function storeGlobalAttribute(){let value=JSON.stringify(globalAttribute);storageStore(globalAttributeKey(),value);}function powerOfBase10(exponent){let i=0;let power=1;while(i<exponent){power=power*10;i=i+1;}return power;}function makeBalanceKey(address){return'balance_'+address;}function makeAllowanceKey(owner,spender){return'allow_'+owner+'_to_'+spender;}function valueCheck(value){if(value.startsWith('-')||value==='0'){return false;}return true;}function approve(spender,value){assert(addressCheck(spender)===true,'Arg-spender is not a valid address.');assert(stoI64Check(value)===true,'Arg-value must be alphanumeric.');assert(valueCheck(value)===true,'Arg-value must be positive number.');let key=makeAllowanceKey(sender,spender);storageStore(key,value);tlog('approve',sender,spender,value);return true;}function allowance(owner,spender){assert(addressCheck(owner)===true,'Arg-owner is not a valid address.');assert(addressCheck(spender)===true,'Arg-spender is not a valid address.');let key=makeAllowanceKey(owner,spender);let value=storageLoad(key);assert(value!==false,'Get allowance '+owner+' to '+spender+' from metadata failed.');return value;}function transfer(to,value){assert(addressCheck(to)===true,'Arg-to is not a valid address.');assert(stoI64Check(value)===true,'Arg-value must be alphanumeric.');assert(valueCheck(value)===true,'Arg-value must be positive number.');if(sender===to){tlog('transfer',sender,to,value);return true;}let senderKey=makeBalanceKey(sender);let senderValue=storageLoad(senderKey);assert(senderValue!==false,'Get balance of '+sender+' from metadata failed.');assert(int64Compare(senderValue,value)>=0,'Balance:'+senderValue+' of sender:'+sender+' < transfer value:'+value+'.');let toKey=makeBalanceKey(to);let toValue=storageLoad(toKey);toValue=(toValue===false)?value:int64Add(toValue,value);storageStore(toKey,toValue);senderValue=int64Sub(senderValue,value);storageStore(senderKey,senderValue);tlog('transfer',sender,to,value);return true;}function assign(to,value){assert(addressCheck(to)===true,'Arg-to is not a valid address.');assert(stoI64Check(value)===true,'Arg-value must be alphanumeric.');assert(valueCheck(value)===true,'Arg-value must be positive number.');if(thisAddress===to){tlog('assign',to,value);return true;}loadGlobalAttribute();assert(sender===globalAttribute.contractOwner,sender+' has no permission to assign contract balance.');assert(int64Compare(globalAttribute.balance,value)>=0,'Balance of contract:'+globalAttribute.balance+' < assign value:'+value+'.');let toKey=makeBalanceKey(to);let toValue=storageLoad(toKey);toValue=(toValue===false)?value:int64Add(toValue,value);storageStore(toKey,toValue);globalAttribute.balance=int64Sub(globalAttribute.balance,value);storeGlobalAttribute();tlog('assign',to,value);return true;}function transferFrom(from,to,value){assert(addressCheck(from)===true,'Arg-from is not a valid address.');assert(addressCheck(to)===true,'Arg-to is not a valid address.');assert(stoI64Check(value)===true,'Arg-value must be alphanumeric.');assert(valueCheck(value)===true,'Arg-value must be positive number.');if(from===to){tlog('transferFrom',sender,from,to,value);return true;}let fromKey=makeBalanceKey(from);let fromValue=storageLoad(fromKey);assert(fromValue!==false,'Get value failed, maybe '+from+' has no value.');assert(int64Compare(fromValue,value)>=0,from+' balance:'+fromValue+' < transfer value:'+value+'.');let allowValue=allowance(from,sender);assert(int64Compare(allowValue,value)>=0,'Allowance value:'+allowValue+' < transfer value:'+value+' from '+from+' to '+to+'.');let toKey=makeBalanceKey(to);let toValue=storageLoad(toKey);toValue=(toValue===false)?value:int64Add(toValue,value);storageStore(toKey,toValue);fromValue=int64Sub(fromValue,value);storageStore(fromKey,fromValue);let allowKey=makeAllowanceKey(from,sender);allowValue=int64Sub(allowValue,value);storageStore(allowKey,allowValue);tlog('transferFrom',sender,from,to,value);return true;}function changeOwner(address){assert(addressCheck(address)===true,'Arg-address is not a valid address.');loadGlobalAttribute();assert(sender===globalAttribute.contractOwner,sender+' has no permission to modify contract ownership.');globalAttribute.contractOwner=address;storeGlobalAttribute();tlog('changeOwner',sender,address);}function name(){return globalAttribute.name;}function symbol(){return globalAttribute.symbol;}function decimals(){return globalAttribute.decimals;}function totalSupply(){return globalAttribute.totalSupply;}function ctp(){return globalAttribute.ctp;}function contractInfo(){return globalAttribute;}function balanceOf(address){assert(addressCheck(address)===true,'Arg-address is not a valid address.');if(address===globalAttribute.contractOwner||address===thisAddress){return globalAttribute.balance;}let key=makeBalanceKey(address);let value=storageLoad(key);assert(value!==false,'Get balance of '+address+' from metadata failed.');return value;}function init(input_str){let input=JSON.parse(input_str);assert(stoI64Check(input.params.supply)===true&&typeof input.params.name==='string'&&typeof input.params.symbol==='string'&&typeof input.params.decimals==='number','Args check failed.');globalAttribute.ctp='1.0';globalAttribute.name=input.params.name;globalAttribute.symbol=input.params.symbol;globalAttribute.decimals=input.params.decimals;globalAttribute.totalSupply=int64Mul(input.params.supply,powerOfBase10(globalAttribute.decimals));globalAttribute.contractOwner=sender;globalAttribute.balance=globalAttribute.totalSupply;storageStore(globalAttributeKey(),JSON.stringify(globalAttribute));}function main(input_str){let input=JSON.parse(input_str);if(input.method==='transfer'){transfer(input.params.to,input.params.value);}else if(input.method==='transferFrom'){transferFrom(input.params.from,input.params.to,input.params.value);}else if(input.method==='approve'){approve(input.params.spender,input.params.value);}else if(input.method==='assign'){assign(input.params.to,input.params.value);}else if(input.method==='changeOwner'){changeOwner(input.params.address);}else{throw'<unidentified operation type>';}}function query(input_str){loadGlobalAttribute();let result={};let input=JSON.parse(input_str);if(input.method==='name'){result.name=name();}else if(input.method==='symbol'){result.symbol=symbol();}else if(input.method==='decimals'){result.decimals=decimals();}else if(input.method==='totalSupply'){result.totalSupply=totalSupply();}else if(input.method==='ctp'){result.ctp=ctp();}else if(input.method==='contractInfo'){result.contractInfo=contractInfo();}else if(input.method==='balanceOf'){result.balance=balanceOf(input.params.address);}else if(input.method==='allowance'){result.allowance=allowance(input.params.owner,input.params.spender);}else{throw'<unidentified operation type>';}log(result);return JSON.stringify(result);}`
};

export default ctp;