non-custodial liquid wallets

4 files changed, 134 insertions, 62 deletions

diff --git a/routes/liquid/broadcast.js b/routes/liquid/broadcast.js
new file mode 100644
index 00000000..e3709597
--- /dev/null
+++ b/routes/liquid/broadcast.js
@@ -0,0 +1,36 @@
+module.exports = ah(async (req, res) => {
+  try {
+    const { user } = req;
+    let hash = await lq.sendRawTransaction(req.body.tx);
+
+    if (user) {
+      let { account } = user;
+      let payment = await db.Payment.create({
+        ...req.body.payment,
+        hash,
+        amount: -req.body.payment.amount,
+        tip: 0,
+        account_id: account.id,
+        user_id: user.id,
+        rate: app.get("rates")[user.currency],
+        currency: user.currency,
+        confirmed: true,
+        received: false,
+        network: "LBTC",
+      });
+
+      account.balance += payment.amount - payment.fee;
+      await account.save();
+
+      payment = payment.get({ plain: true });
+      payment.account = account.get({ plain: true });
+      emit(user.username, "payment", payment);
+      emit(user.username, "account", payment.account);
+      res.send(payment);
+    } else {
+      res.send(result);
+    }
+  } catch (e) {
+    res.status(500).send(e.message);
+  }
+});
diff --git a/routes/liquid/fee.js b/routes/liquid/fee.js
index 77a9ce17..acf28160 100644
--- a/routes/liquid/fee.js
+++ b/routes/liquid/fee.js
@@ -1,8 +1,20 @@
+const buildTx = require("../../lib/buildliquidtx");
+
 module.exports = ah(async (req, res) => {
   let { user } = req;
   let { address, asset, amount, feeRate } = req.body;
   let tx, fee;
 
+  if (user.account.pubkey) {
+    try {
+      let psbt = await buildTx({ address, asset, amount, feeRate, user });
+      return res.send(psbt);
+    } catch(e) {
+      throw e;
+      return res.status(500).send(e.message);
+    } 
+  }
+
   let invoice = await db.Invoice.findOne({
     where: { address },
     include: {
@@ -13,8 +25,11 @@ module.exports = ah(async (req, res) => {
   });
 
   if (invoice) {
-    emit(user.username, "to", invoice.user);
-    return res.end();
+    let { ismine } = await lq.getAddressInfo(address);
+    if (ismine) {
+      emit(user.username, "to", invoice.user);
+      return res.end();
+    }
   }
 
   try {
diff --git a/routes/liquid/receive.js b/routes/liquid/receive.js
index 3fe235a6..325e6783 100644
--- a/routes/liquid/receive.js
+++ b/routes/liquid/receive.js
@@ -1,7 +1,53 @@
 const axios = require("axios");
+const reverse = require("buffer-reverse");
 const zmq = require("zeromq");
 const { Op } = require("sequelize");
+const { fromBase58 } = require("bip32");
+const bitcoin = require("bitcoinjs-lib");
 const elements = require("elementsjs-lib");
+const liquid = require("liquidjs-lib");
+
+const network =
+  liquid.networks[
+    config.liquid.network === "mainnet" ? "liquid" : config.liquid.network
+  ];
+
+const getAccount = async (params, pending) => {
+  let account = await db.Account.findOne({
+    where: params
+  });
+
+  if (account) return account;
+
+  let { asset } = params;
+  let name = asset.substr(0, 6);
+  let domain = "";
+  let ticker = asset.substr(0, 3).toUpperCase();
+  let precision = 8;
+
+  const assets = (await axios.get("https://assets.blockstream.info/")).data;
+
+  if (assets[asset]) {
+    ({ domain, ticker, precision, name } = assets[asset]);
+  } else {
+    const existing = await db.Account.findOne({
+      where: {
+        asset,
+      },
+      order: [["id", "ASC"]],
+      limit: 1,
+    });
+
+    if (existing) {
+      ({ domain, ticker, precision, name } = existing);
+    }
+  }
+
+  params = { ...params, ...{ domain, ticker, precision, name } };
+  params.balance = 0;
+  params.pending = pending;
+  return db.Account.create(params);
+};
 
 const zmqRawBlock = zmq.socket("sub");
 zmqRawBlock.connect(config.liquid.zmqrawblock);
@@ -26,77 +72,50 @@ zmqRawTx.on("message", async (topic, message, sequence) => {
       const value = toSats(o.value);
       const address = o.scriptPubKey.addresses[0];
 
-      if (Object.keys(addresses).includes(address)) {
+      if (
+        Object.keys(addresses).includes(address) &&
+        !change.includes(address)
+      ) {
         let user = await getUser(addresses[address]);
 
-        let confirmed = 0;
+        let invoice = await db.Invoice.findOne({
+          where: {
+            address,
+            user_id: user.id,
+            network: "LBTC",
+          },
+          order: [["id", "DESC"]],
+          include: {
+            model: db.Account,
+            as: "account",
+          },
+        });
 
-        let params = {
-          user_id: user.id,
-          asset,
-        };
+        if (!invoice) return;
 
-        let account = await db.Account.findOne({
-          where: params,
-        });
+        let confirmed = 0;
 
-        if (account) {
+        let { account } = invoice;
+
+        if (account.asset === asset) {
           account.pending += value;
           await account.save();
         } else {
-          let name = asset.substr(0, 6);
-          let domain = '';
-          let ticker = asset.substr(0, 3).toUpperCase();
-          let precision = 8;
-
-          const assets = (await axios.get("https://assets.blockstream.info/"))
-            .data;
-
-          if (assets[asset]) {
-            ({ domain, ticker, precision, name } = assets[asset]);
-          } else {
-            const existing = await db.Account.findOne({
-              where: {
-                asset,
-              },
-              order: [["id", "ASC"]],
-              limit: 1,
-            });
-
-            if (existing) {
-              ({ domain, ticker, precision, name } = existing);
-            }
-          }
-
-          params = { ...params, ...{ domain, ticker, precision, name } };
-          params.balance = 0;
-          params.pending = value;
-          account = await db.Account.create(params);
+          if (!account) account = await getAccount(
+            {
+              user_id: user.id,
+              asset,
+              pubkey: account.pubkey,
+            },
+            value
+          );
         }
 
         if (config.liquid.walletpass)
           await lq.walletPassphrase(config.liquid.walletpass, 300);
 
-        user.confidential = await lq.getNewAddress();
-        user.liquid = (
-          await lq.getAddressInfo(user.confidential)
-        ).unconfidential;
-
         await user.save();
 
-        addresses[user.liquid] = user.username;
-
-        let invoice;
-        if (asset === config.liquid.btcasset) {
-          invoice = await db.Invoice.findOne({
-            where: {
-              user_id: user.id,
-              network: "LBTC",
-            },
-            order: [["id", "DESC"]],
-          });
-        }
-
         const currency = invoice ? invoice.currency : user.currency;
         const rate = invoice ? invoice.rate : app.get("rates")[user.currency];
         const tip = invoice ? invoice.tip : 0;
@@ -123,7 +142,7 @@ zmqRawTx.on("message", async (topic, message, sequence) => {
 
         emit(user.username, "payment", payment);
         emit(user.username, "account", account);
-        l.info("liquid detected", user.username, asset, value);
+        l.info("liquid detected", address, user.username, asset, value);
         notify(user, `${value} SAT payment detected`);
       }
     })
@@ -218,6 +237,7 @@ zmqRawBlock.on("message", async (topic, message, sequence) => {
 });
 
 setInterval(async () => {
+  //  throw new Error("boom");
   try {
     const arr = Object.keys(queue);
 
diff --git a/routes/liquid/send.js b/routes/liquid/send.js
index 1d12db30..7f7e1cb5 100644
--- a/routes/liquid/send.js
+++ b/routes/liquid/send.js
@@ -39,8 +39,9 @@ module.exports = ah(async (req, res) => {
     await db.transaction(async (transaction) => {
       for (let i = 0; i < assets.length; i++) {
         let asset = assets[i];
-        let total = totals[asset];
-        if (change[asset]) total -= change[asset];
+        let amount = totals[asset];
+        if (change[asset]) amount -= change[asset];
+        let total = amount;
         if (asset === config.liquid.btcasset) total += fee;
 
         l.info("creating liquid payment", user.username, asset, total, fee);
@@ -67,7 +68,7 @@ module.exports = ah(async (req, res) => {
         await account.save({ transaction });
 
         let payment = {
-          amount: -total,
+          amount: -amount,
           account_id: account.id,
           fee,
           memo,