Create NexusTokenContract.js

blockchain_integration/pi_network/pi-network-interoperability/bridge-contracts/nexus-smart-chain/NexusTokenContract.js

@@ -0,0 +1,47 @@
+const Web3 = require('web3');
+const Ethers = require('ethers');
+
+class NexusTokenContract {
+  constructor(nexusTokenContractAddress, providerUrl) {
+    this.nexusTokenContractAddress = nexusTokenContractAddress;
+    this.web3 = new Web3(new Web3.providers.HttpProvider(providerUrl));
+    this.ethersProvider = new Ethers.providers.JsonRpcProvider(providerUrl);
+  }
+
+  async transfer(recipientAddress, amount) {
+    const txCount = await this.web3.eth.getTransactionCount(this.nexusTokenContractAddress);
+    const tx = {
+      from: this.nexusTokenContractAddress,
+      to: recipientAddress,
+      value: amount,
+      gas: '20000',
+      gasPrice: '20',
+      nonce: txCount
+    };
+    const signedTx = await this.ethersProvider.signTransaction(tx, '0x1234567890abcdef');
+    await this.ethersProvider.sendTransaction(signedTx);
+  }
+
+  async approve(spenderAddress, amount) {
+    const txCount = await this.web3.eth.getTransactionCount(this.nexusTokenContractAddress);
+    const tx = {
+      from: this.nexusTokenContractAddress,
+      to: spenderAddress,
+      value: amount,
+      gas: '20000',
+      gasPrice: '20',
+      nonce: txCount
+    };
+    const signedTx = await this.ethersProvider.signTransaction(tx, '0x1234567890abcdef');
+    await this.ethersProvider.sendTransaction(signedTx);
+  }
+
+  async balanceOf(address) {
+    return this.web3.eth.call({
+      to: this.nexusTokenContractAddress,
+      data: `0x70a08231000000000000000000000000${address.slice(2)}`
+    });
+  }
+}
+
+module.exports = NexusTokenContract;