index.js

const express = require("express")
const app = express()
const port = 8000
const hre = require("hardhat");
const {exec} = require("child_process");

app.use(express.json());

const cmd = async (command) => {
    return new Promise(async (resolve, reject) => {
        const process = await exec(command);
        let result = {}
        process.stdout.on("data", data => {
            result = data.split("MD5=")[1]
        })
        // process.stderr.on("data", reject)
        process.on("exit", () => resolve(result))
    })
}

app.post("/api/v1/mint", async (req, res) => {
    const body = req.body
    const Musicd = await hre.ethers.getContractFactory("Musicd");
    try {
        if (body.path && body.principal) {
            const checksum = await cmd(`ffmpeg -i \"${body.path}\" -map 0:a -codec copy -hide_banner -loglevel warning -f md5 -`)
            const block = await Musicd.deploy(checksum.replace("\n", ""), body.principal);
            await block.deployed();
            res.json({id: block.address})
        } else {
            res.json({error: "Missing parameters"})
        }
    } catch (e) {
        console.error(e)
    }
})

app.listen(port, () => {
    console.log(`Fasttrak Network listening on port ${port}`)
})