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