working rss feed to nostr publish

node_modules/nostr-tools/lib/esm/nip26.js

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+// nip26.ts
+import { schnorr as schnorr2 } from "@noble/curves/secp256k1";
+import { bytesToHex as bytesToHex2 } from "@noble/hashes/utils";
+import { sha256 } from "@noble/hashes/sha256";
+
+// utils.ts
+var utf8Decoder = new TextDecoder("utf-8");
+var utf8Encoder = new TextEncoder();
+
+// keys.ts
+import { schnorr } from "@noble/curves/secp256k1";
+import { bytesToHex } from "@noble/hashes/utils";
+function getPublicKey(privateKey) {
+  return bytesToHex(schnorr.getPublicKey(privateKey));
+}
+
+// nip26.ts
+function createDelegation(privateKey, parameters) {
+  let conditions = [];
+  if ((parameters.kind || -1) >= 0)
+    conditions.push(`kind=${parameters.kind}`);
+  if (parameters.until)
+    conditions.push(`created_at<${parameters.until}`);
+  if (parameters.since)
+    conditions.push(`created_at>${parameters.since}`);
+  let cond = conditions.join("&");
+  if (cond === "")
+    throw new Error("refusing to create a delegation without any conditions");
+  let sighash = sha256(utf8Encoder.encode(`nostr:delegation:${parameters.pubkey}:${cond}`));
+  let sig = bytesToHex2(schnorr2.sign(sighash, privateKey));
+  return {
+    from: getPublicKey(privateKey),
+    to: parameters.pubkey,
+    cond,
+    sig
+  };
+}
+function getDelegator(event) {
+  let tag = event.tags.find((tag2) => tag2[0] === "delegation" && tag2.length >= 4);
+  if (!tag)
+    return null;
+  let pubkey = tag[1];
+  let cond = tag[2];
+  let sig = tag[3];
+  let conditions = cond.split("&");
+  for (let i = 0; i < conditions.length; i++) {
+    let [key, operator, value] = conditions[i].split(/\b/);
+    if (key === "kind" && operator === "=" && event.kind === parseInt(value))
+      continue;
+    else if (key === "created_at" && operator === "<" && event.created_at < parseInt(value))
+      continue;
+    else if (key === "created_at" && operator === ">" && event.created_at > parseInt(value))
+      continue;
+    else
+      return null;
+  }
+  let sighash = sha256(utf8Encoder.encode(`nostr:delegation:${event.pubkey}:${cond}`));
+  if (!schnorr2.verify(sig, sighash, pubkey))
+    return null;
+  return pubkey;
+}
+export {
+  createDelegation,
+  getDelegator
+};