uploadRoute.js

const ipfsAPI = require('ipfs-api');
const fs = require('fs');
const ipfs = ipfsAPI('localhost', '5001');
var date = new Date();
var express = require('express');
var mongodb = require('mongodb').MongoClient;

var Web3 = require('web3');
var Contract = require('truffle-contract');
var path = require('path');

var provider = new Web3.providers.HttpProvider("http://localhost:8545");

// SAT Contract
var SATContractJSON = require(path.join(__dirname, 'build/contracts/product.json'));
var SATContract = Contract(SATContractJSON);
SATContract.setProvider(provider);

var uploadRouter = express.Router();
var u_router = function(web3) {
    uploadRouter.route("/")
        .post(function(req, res) {
            // if (Object.keys(req.files).length == 0) {
            //     return res.status(400).send('No files were uploaded.');
            // }

            // // The name of the input field (i.e. "sampleFile") is used to retrieve the uploaded file
            // let sampleFile = req.files.file;

            // var fname = req.files.file.name;
            // var pathname = 'public/static/' + fname;
            // // Use the mv() method to place the file somewhere on your server
            // sampleFile.mv(pathname, function(err) {
            //     if (err)
            //         return res.status(500).send(err);

            //     let testFile = fs.readFileSync(pathname);
            //     let testBuffer = new Buffer.from(testFile);

            //     // console.log(web3);

            //     ipfs.files.add(testBuffer, function(err, file) {
            //         if (err) {
            //             console.log(err);
            //         } else {
            //             // console.log(req);
            //             const url = 'mongodb://localhost:27017';
            //             mongodb.connect(url, { useNewUrlParser: true }, function(err, client) {
            //                 console.log("Successfully connected to database.");

            //                 const db = client.db('NodeDemoWebApp');
            //                 // const Users = db.collection('Users');
            //                 const Submissions = db.collection('Submissions');

            //                 Submissions.insertOne({ owner: req.user._id, hash: file[0].hash, timestamp: new Date(Date.now()).toISOString(), status: 'Pending', domain: req.body.domain }, function(err, result) {
            //                     if (err == undefined) {
            //                         console.log("Successfully uploaded File");

            //                         SATContract.deployed().then(function(instance) {
            //                             web3.personal.unlockAccount(req.user.address, req.user.pwd);
            //                             return instance.transfer(web3.eth.accounts[0], 100, { from: req.user.address, gas: 100000 });

            //                         }).then(function(result) {
            //                             console.log("This is SAT contract");
            //                             console.log(result.toString());

            //                         }).catch(function(error) {
            //                             console.log(error);
            //                         });

            //                         MainContract.deployed().then(function(instance) {
            //                             web3.personal.unlockAccount(web3.eth.accounts[0], "Pink#4119");
            //                             return instance.newSubmission(req.user.address, file[0].hash, { from: web3.eth.accounts[0], gas: 100000 });

            //                         }).then(function(result) {
            //                             console.log("This is main contract")
            //                             console.log(result.toString());

            //                         }).catch(function(error) {
            //                             console.log(error);
            //                         });

            //                     } else console.log(err);
            //                 });
            //             });
            //         }
            //         res.redirect("/p");
            //     });
            // });
            console.log("Bhai ho");
            SATContract.deployed().then(function(instance) {
                return instance.returnHello.call();
            }).then(function(result) {
                console.log(result.toString());
                bal = result.toString();

            }, function(error) {
                console.log(error);
            });
        });
    return uploadRouter;
}
// console.log("Bhai ho");
// SATContract.deployed().then(function(instance) {
//     return instance.returnHello.call();
// }).then(function(result) {
//     console.log(result.toString());
//     bal = result.toString();

// }, function(error) {
//     console.log(error);
// });
module.exports = u_router;