From 0bf630c39fe290ea2718eab7a0759d978c736ef9 Mon Sep 17 00:00:00 2001
From: Adam Soltys <adam@coinos.io>
Date: Tue, 26 Nov 2024 13:08:08 -0800
Subject: bip21 and socket fixes

---
 src/lib/bip21.ts | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)
 create mode 100644 src/lib/bip21.ts

(limited to 'src/lib/bip21.ts')

diff --git a/src/lib/bip21.ts b/src/lib/bip21.ts
new file mode 100644
index 00000000..2642afab
--- /dev/null
+++ b/src/lib/bip21.ts
@@ -0,0 +1,48 @@
+export function decode(uri, allowedSchemes = ["bitcoin", "liquidnetwork"]) {
+	// Determine the scheme from the URI
+	const split = uri.indexOf(":");
+	if (split === -1) {
+		throw new Error("Invalid URI: Missing scheme");
+	}
+
+	const urnScheme = uri.slice(0, split).toLowerCase();
+	if (!allowedSchemes.includes(urnScheme)) {
+		throw new Error(`Invalid scheme: ${urnScheme}`);
+	}
+
+	// Extract address and query string
+	const queryStart = uri.indexOf("?");
+	const address = uri.slice(
+		split + 1,
+		queryStart === -1 ? undefined : queryStart,
+	);
+	const query = queryStart === -1 ? "" : uri.slice(queryStart + 1);
+	const options = Object.fromEntries(new URLSearchParams(query));
+
+	const n = Number(options?.amount);
+	if (!Number.isFinite(n)) throw new Error("Invalid amount");
+	if (n < 0) throw new Error("Invalid amount");
+
+	return { scheme: urnScheme, address, options };
+}
+
+export function encode(
+	address,
+	options = { amount: "" },
+	urnScheme = "bitcoin",
+) {
+	if (!address || typeof address !== "string") {
+		throw new TypeError("Invalid address");
+	}
+
+	if (!["bitcoin", "liquidnetwork"].includes(urnScheme)) {
+		throw new Error(`Unsupported scheme: ${urnScheme}`);
+	}
+
+	const n = Number(options?.amount);
+	if (!Number.isFinite(n)) throw new Error("Invalid amount");
+	if (n < 0) throw new Error("Invalid amount");
+
+	const query = new URLSearchParams(options).toString();
+	return `${urnScheme}:${address}${query ? `?${query}` : ""}`;
+}
-- 
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