From a7168a10f45c305a45d2e56db6fbfeef210f1b9b Mon Sep 17 00:00:00 2001
From: Adam Soltys <asoltys@gmail.com>
Date: Mon, 2 Aug 2021 02:05:28 -0700
Subject: silhouettes

---
 routes/assets.js      |  7 ++---
 routes/liquid/taxi.js | 74 +++++++++++++++++++++++++++++++++++++++++++++++++++
 routes/payments.js    |  1 +
 3 files changed, 79 insertions(+), 3 deletions(-)
 create mode 100644 routes/liquid/taxi.js

diff --git a/routes/assets.js b/routes/assets.js
index f99301ae..2494ee94 100644
--- a/routes/assets.js
+++ b/routes/assets.js
@@ -111,7 +111,7 @@ app.post(
 
       if (filename) contract.filename = filename;
 
-      l.info("attempting issuance", req.user.username, contract);
+      l.info("attempting issuance", req.user.username, contract, "address", address, "pubkey", pubkey);
 
       sha256.update(JSON.stringify(contract));
       const hash = sha256.digest("hex");
@@ -149,7 +149,7 @@ app.post(
       const srt = await lq.signRawTransactionWithWallet(brt);
       const allowed = (await lq.testMempoolAccept([srt.hex]))[0].allowed;
       fs.writeFileSync('tx', srt.hex);
-      if (!allowed) throw new Error();
+      if (!allowed) throw new Error("issuance rejected by mempool");
       const txid = await lq.sendRawTransaction(srt.hex);
 
       await db.transaction(async transaction => {
@@ -185,6 +185,7 @@ app.post(
         await account.reload({ transaction });
         emit(user.username, "account", account);
 
+        if (address) return;
         account = await db.Account.create(
           {
             asset,
@@ -271,7 +272,7 @@ app.post(
 
       res.send(issuances[txid]);
     } catch (e) {
-      l.error("asset issuance failed", e.message);
+      l.error("asset issuance failed", e.message, e.stack);
       res.status(500).send(e.message);
     }
   })
diff --git a/routes/liquid/taxi.js b/routes/liquid/taxi.js
new file mode 100644
index 00000000..3f450752
--- /dev/null
+++ b/routes/liquid/taxi.js
@@ -0,0 +1,74 @@
+const { ECPair, Psbt, payments, networks } = require("@asoltys/liquidjs-lib");
+const wretch = require("wretch");
+const fetch = require("node-fetch");
+wretch().polyfills({ fetch });
+const url = prod
+  ? "https://blockstream.info/liquid/api"
+  : "http://localhost:3002";
+const electrs = wretch().url(url);
+const network = networks.regtest;
+
+module.exports = ah(async (req, res) => {
+  let { user } = req;
+  let { psbt } = req.body;
+
+  let utxos = await electrs
+    .url(`/address/XLDLqkbbNKvgS9vhj3fQWPv1Y3UNoHEneZ/utxo`)
+    .get()
+    .json();
+  let tx = utxos.find(tx => tx.value >= 150);
+  let hex = await electrs
+    .url(`/tx/${tx.txid}/hex/`)
+    .get()
+    .text();
+
+  let redeemScript = payments.p2wpkh({
+    pubkey: Buffer.from(
+      "03c42e2b536630da346d8f225797406eb86700239d627101a61e26e6d544db072e",
+      "hex"
+    ),
+    network
+  }).output;
+
+  let p = Psbt.fromBase64(psbt)
+    .addInput({
+      hash: tx.txid,
+      index: tx.vout,
+      redeemScript,
+      nonWitnessUtxo: Buffer.from(hex, "hex")
+    })
+    .addOutput({
+      asset: network.assetHash,
+      nonce: Buffer.alloc(1, 0),
+      script: Buffer.alloc(0),
+      value: 150
+    })
+    .addOutput({
+      asset,
+      nonce: Buffer.alloc(1),
+      script: Address.toOutputScript(
+        "XLDLqkbbNKvgS9vhj3fQWPv1Y3UNoHEneZ",
+        network
+      ),
+      value: tx.value - 150
+    })
+    .signInput(
+      1,
+      ECPair.fromPrivateKey(
+        Buffer.from(
+          "6802b8dfed3733e3b147582810c431150444c026066796b808c36f7089d02773",
+          "hex"
+        )
+      )
+    );
+
+  try {
+    if ((user.username = "silhouettes")) {
+      res.send({ psbt: p.toBase64() });
+    } else {
+      throw new Error("taxi service only available to select customers");
+    }
+  } catch (e) {
+    return res.status(500).send(e);
+  }
+});
diff --git a/routes/payments.js b/routes/payments.js
index a4bae562..a749e333 100644
--- a/routes/payments.js
+++ b/routes/payments.js
@@ -142,6 +142,7 @@ ah(async () => {
     app.get("/liquid/generate", auth, require("./liquid/generate"));
     app.post("/liquid/fee", auth, require("./liquid/fee"));
     app.post("/liquid/send", auth, require("./liquid/send"));
+    app.post("/taxi", auth, require("./liquid/taxi"));
     require("./liquid/receive");
 
     setTimeout(async () => {
-- 
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