diff --git a/.gitignore b/.gitignore index e3459f6b..359b42d2 100644 --- a/.gitignore +++ b/.gitignore @@ -2,3 +2,4 @@ dist .cache !.gitignore *.lock +node_modules/ diff --git a/client/index.html b/client/index.html index e79f672c..ebe9a5cd 100644 --- a/client/index.html +++ b/client/index.html @@ -3,7 +3,15 @@

Your Wallet

- + +
+ 0 +
+
+ +
+

Your Wallet

+
0
diff --git a/client/index.js b/client/index.js index c8088cdb..7188d9c4 100644 --- a/client/index.js +++ b/client/index.js @@ -1,4 +1,6 @@ import "./index.scss"; +const EC = require('elliptic').ec; +var ec = new EC('secp256k1'); const server = "http://localhost:3042"; @@ -7,7 +9,6 @@ document.getElementById("exchange-address").addEventListener('input', ({ target: document.getElementById("balance").innerHTML = 0; return; } - fetch(`${server}/balance/${value}`).then((response) => { return response.json(); }).then(({ balance }) => { @@ -15,13 +16,32 @@ document.getElementById("exchange-address").addEventListener('input', ({ target: }); }); +// I don't understand how this element doesn't have exactly the same behavior +// as the one above, except using a private key. I have a hunch +// this has to do with the decimal/hex export thing, maybe. +document.getElementById("exchange-key").addEventListener('input', ({ target: {value} }) => { + if(value === "") { + document.getElementById("balance").innerHTML = 0; + return; + } + const key = ec.keyFromPrivate(value); + const addr = key.getPublic().encode('hex').slice(-40); + + fetch(`${server}/balance/${addr}`).then((response) => { + return response.json(); + }).then(({ balance }) => { + document.getElementById("balance").innerHTML = balance; + }); +}); + document.getElementById("transfer-amount").addEventListener('click', () => { - const sender = document.getElementById("exchange-address").value; + const sender = document.getElementById("exchange-key").addr; const amount = document.getElementById("send-amount").value; const recipient = document.getElementById("recipient").value; + const signature = document.getElementById("exchange-key").key.sign(`${sender}${amount}${recipient}`); const body = JSON.stringify({ - sender, amount, recipient + sender, amount, recipient, signature }); const request = new Request(`${server}/send`, { method: 'POST', body }); diff --git a/package-lock.json b/package-lock.json new file mode 100644 index 00000000..ff6de5b0 --- /dev/null +++ b/package-lock.json @@ -0,0 +1,581 @@ +{ + "name": "exchange", + "version": "1.0.0", + "lockfileVersion": 1, + "requires": true, + "dependencies": { + "accepts": { + "version": "1.3.7", + "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.7.tgz", + "integrity": "sha512-Il80Qs2WjYlJIBNzNkK6KYqlVMTbZLXgHx2oT0pU/fjRHyEp+PEfEPY0R3WCwAGVOtauxh1hOxNgIf5bv7dQpA==", + "requires": { + "mime-types": "~2.1.24", + "negotiator": "0.6.2" + } + }, + "anymatch": { + "version": "3.1.1", + "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-3.1.1.tgz", + "integrity": "sha512-mM8522psRCqzV+6LhomX5wgp25YVibjh8Wj23I5RPkPppSVSjyKD2A2mBJmWGa+KN7f2D6LNh9jkBCeyLktzjg==", + "dev": true, + "requires": { + "normalize-path": 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"parceljs": "0.0.1" } } diff --git a/server/index.js b/server/index.js index 6da22c6d..68f6ed83 100644 --- a/server/index.js +++ b/server/index.js @@ -2,16 +2,49 @@ const express = require('express'); const app = express(); const cors = require('cors'); const port = 3042; +const EC = require('elliptic').ec; // localhost can have cross origin errors // depending on the browser you use! app.use(cors()); app.use(express.json()); +// Create and initialize EC context +// (better do it once and reuse it) +var ec = new EC('secp256k1'); + +// Generate keys +var key1 = ec.genKeyPair(); +var key2 = ec.genKeyPair(); +var key3 = ec.genKeyPair(); + +const pub1 = key1.getPublic().encode('hex').slice(-40); +const pub2 = key2.getPublic().encode('hex').slice(-40); +const pub3 = key3.getPublic().encode('hex').slice(-40); + +console.log({ + address: pub1.toString(), + privateKey: key1.getPrivate().toString(16), + publicX: key1.getPublic().x.toString(16), + publicY: key1.getPublic().y.toString(16), +}); +console.log({ + address: pub2.toString(16), + privateKey: key2.getPrivate().toString(16), + publicX: key2.getPublic().x.toString(16), + publicY: key2.getPublic().y.toString(16), +}); +console.log({ + address: pub3.toString(16), + privateKey: key3.getPrivate().toString(16), + publicX: key3.getPublic().x.toString(16), + publicY: key3.getPublic().y.toString(16), +}); + const balances = { - "1": 100, - "2": 50, - "3": 75, + [pub1]: 101, + [pub2]: 102, + [pub3]: 103, } app.get('/balance/:address', (req, res) => { @@ -21,10 +54,16 @@ app.get('/balance/:address', (req, res) => { }); app.post('/send', (req, res) => { - const {sender, recipient, amount} = req.body; - balances[sender] -= amount; - balances[recipient] = (balances[recipient] || 0) + +amount; - res.send({ balance: balances[sender] }); + const {sender, amount, recipient, signature} = req.body; + // here is where we need to check that the message is signed with the private key of the msg sender. + if ( + sender.verify(`${sender}${amount}${recipient}`) + ) { + balances[sender] -= amount; + balances[recipient] = (balances[recipient] || 0) + +amount; + res.send({ balance: balances[sender] }); + } + else { res.send("some kind of error message") } }); app.listen(port, () => {