From a54c628c7778f9aafaea76286da3cc53390e7534 Mon Sep 17 00:00:00 2001
From: Kieran <kieran@harkin.me>
Date: Sun, 17 Mar 2024 19:09:30 +0000
Subject: [PATCH] feat: lnurl handler

---
 .gitignore                               |  3 +-
 functions/.well-known/lnurlp/[handle].ts | 48 ++++++++++++++++++++++++
 tsconfig.json                            |  1 +
 3 files changed, 51 insertions(+), 1 deletion(-)
 create mode 100644 functions/.well-known/lnurlp/[handle].ts

diff --git a/.gitignore b/.gitignore
index b251c5f..ec2ecb6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -31,4 +31,5 @@ yarn-error.log*
 !.yarn/sdks
 !.yarn/versions
 
-dev-dist/
\ No newline at end of file
+dev-dist/
+.wranger/
\ No newline at end of file
diff --git a/functions/.well-known/lnurlp/[handle].ts b/functions/.well-known/lnurlp/[handle].ts
new file mode 100644
index 0000000..67a9cca
--- /dev/null
+++ b/functions/.well-known/lnurlp/[handle].ts
@@ -0,0 +1,48 @@
+interface Env { }
+
+interface NostrJson {
+    names: Record<string, string>;
+    relays?: Record<string, Array<string>>;
+    nip46?: Record<string, Array<string>>;
+}
+
+async function fetchNip05Pubkey(name: string, domain: string, timeout = 2_000): Promise<string | undefined> {
+    if (!name || !domain) {
+        return undefined;
+    }
+    try {
+        const res = await fetch(`https://${domain}/.well-known/nostr.json?name=${encodeURIComponent(name)}`, {
+            signal: AbortSignal.timeout(timeout),
+        });
+        const data: NostrJson = await res.json();
+        const match = Object.keys(data.names).find(n => {
+            return n.toLowerCase() === name.toLowerCase();
+        });
+        return match ? data.names[match] : undefined;
+    } catch {
+        // ignored
+    }
+    return undefined;
+}
+
+export const onRequest: PagesFunction<Env> = async context => {
+    const handle = context.params.handle as string | undefined;
+    let pubkey = handle;
+    if (handle && handle.length !== 64) {
+        const nip5 = await fetchNip05Pubkey(handle, "zap.stream");
+        if (nip5) {
+            pubkey = nip5;
+        }
+    }
+
+    const response = await fetch(`https://api.zap.stream/.well-known/lnurlp/${pubkey}`);
+    const results = await response.text();
+    const responseHeaders = Object.fromEntries(response.headers.entries());
+    return new Response(results, {
+        headers: {
+            ...responseHeaders,
+            "access-control-allow-origin": "*",
+            "cache-control": "no-store"
+        }
+    });
+}
\ No newline at end of file
diff --git a/tsconfig.json b/tsconfig.json
index 59f38c1..9f4fe8a 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -24,5 +24,6 @@
     }
   },
   "include": ["src"],
+  "exclude": ["functions/**/*"],
   "references": [{ "path": "./tsconfig.node.json" }]
 }