+ Press n or j to go to the next uncovered block, b, p or k for the previous block. +
+ +| File | ++ | Statements | ++ | Branches | ++ | Functions | ++ | Lines | ++ |
|---|---|---|---|---|---|---|---|---|---|
| index.js | +
+
+ |
+ 90.62% | +29/32 | +83.33% | +10/12 | +100% | +3/3 | +90.62% | +29/32 | +
+ Press n or j to go to the next uncovered block, b, p or k for the previous block. +
+ +| 1 +2 +3 +4 +5 +6 +7 +8 +9 +10 +11 +12 +13 +14 +15 +16 +17 +18 +19 +20 +21 +22 +23 +24 +25 +26 +27 +28 +29 +30 +31 +32 +33 +34 +35 +36 +37 +38 +39 +40 +41 +42 +43 +44 +45 +46 +47 +48 +49 +50 +51 +52 +53 +54 +55 +56 +57 | 1x +1x +1x +1x + +1x +1x + +1x + + + + + +1x +1x +1x +1x + + +1x +5x +5x +2x + + +3x +3x +3x +3x +1x + + +2x +2x + +2x +1x + +1x +1x +1x + + + + + + + + +4x + + + + +1x + | const express = require("express");
+const app = express();
+const cors = require("cors");
+const { ethers } = require("ethers");
+
+app.use(cors());
+app.use(express.json());
+
+const balances = {
+ "0x459940270370F1710d7955bF4b599298CbaB1783": 100,
+ "0x1aE9C871e288131414879Aa02550dB90394c4432": 50,
+ "0xD2Bf0137B23d128285a827f3077Db708736b2025": 75,
+};
+
+app.get("/balance/:address", (req, res) => {
+ const { address } = req.params;
+ const balance = balances[address] || 0;
+ res.send({ balance });
+});
+
+app.post("/send", (req, res) => {
+ const { sender, recipient, amount, signature, message } = req.body;
+ if (!signature || !message) {
+ return res.status(400).send({ message: "Signature or message not provided." });
+ }
+
+ try {
+ const utils = ethers.utils;
+ const recoveredAddress = utils.verifyMessage(message, signature);
+ if (recoveredAddress.toLowerCase() !== sender.toLowerCase()) {
+ return res.status(403).send({ message: "Signature verification failed." });
+ }
+
+ setInitialBalance(sender);
+ setInitialBalance(recipient);
+
+ if (balances[sender] < amount) {
+ res.status(400).send({ message: "Not enough funds!" });
+ } else {
+ balances[sender] -= amount;
+ balances[recipient] += amount;
+ res.send({ balance: balances[sender] });
+ }
+ } catch (error) {
+ console.error("Error recovering address from signature:", error);
+ res.status(500).send({ message: "Internal Server Error." });
+ }
+});
+
+function setInitialBalance(address) {
+ Iif (!balances[address]) {
+ balances[address] = 0;
+ }
+}
+
+module.exports = app;
+ |