refactor: pass nip5 to api
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@ -1,29 +1,7 @@
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interface Env {}
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import { bech32 } from "./bech32";
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import { fromHex } from "./hex";
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interface NostrJson {
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names: Record<string, string>;
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}
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const HOST = "snort.social";
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async function fetchNostrAddress(name: string, domain: string) {
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try {
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const res = await fetch(`https://${domain}/.well-known/nostr.json?name=${encodeURIComponent(name)}`, {
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signal: AbortSignal.timeout(1000),
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});
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const data: NostrJson = await res.json();
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const match = Object.keys(data.names).find(n => {
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return n.toLowerCase() === name.toLowerCase();
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});
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return match ? data.names[match] : undefined;
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} catch {
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// ignored
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}
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}
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export const onRequest: PagesFunction<Env> = async context => {
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const u = new URL(context.request.url);
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@ -38,12 +16,7 @@ export const onRequest: PagesFunction<Env> = async context => {
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try {
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let id = u.pathname.split("/").at(-1);
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if (!isEntityPath && nostrAddress) {
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const pubkey = await fetchNostrAddress(id, HOST);
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if (pubkey) {
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id = bech32.encode("npub", bech32.toWords(fromHex(pubkey)));
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} else {
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return next;
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}
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id = `${id}@${HOST}`;
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}
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const fetchApi = `http://nostr.api.v0l.io/api/v1/opengraph/${id}?canonical=${encodeURIComponent(
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`https://${HOST}/%s`,
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@ -1,198 +0,0 @@
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"use strict";
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const ALPHABET = "qpzry9x8gf2tvdw0s3jn54khce6mua7l";
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const ALPHABET_MAP: { [key: string]: number } = {};
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for (let z = 0; z < ALPHABET.length; z++) {
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const x = ALPHABET.charAt(z);
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ALPHABET_MAP[x] = z;
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}
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function polymodStep(pre: number): number {
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const b = pre >> 25;
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return (
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((pre & 0x1ffffff) << 5) ^
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(-((b >> 0) & 1) & 0x3b6a57b2) ^
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(-((b >> 1) & 1) & 0x26508e6d) ^
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(-((b >> 2) & 1) & 0x1ea119fa) ^
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(-((b >> 3) & 1) & 0x3d4233dd) ^
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(-((b >> 4) & 1) & 0x2a1462b3)
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);
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}
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function prefixChk(prefix: string): number | string {
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let chk = 1;
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for (let i = 0; i < prefix.length; ++i) {
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const c = prefix.charCodeAt(i);
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if (c < 33 || c > 126) return "Invalid prefix (" + prefix + ")";
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chk = polymodStep(chk) ^ (c >> 5);
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}
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chk = polymodStep(chk);
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for (let i = 0; i < prefix.length; ++i) {
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const v = prefix.charCodeAt(i);
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chk = polymodStep(chk) ^ (v & 0x1f);
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}
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return chk;
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}
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function convert(data: ArrayLike<number>, inBits: number, outBits: number, pad: true): number[];
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function convert(data: ArrayLike<number>, inBits: number, outBits: number, pad: false): number[] | string;
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function convert(data: ArrayLike<number>, inBits: number, outBits: number, pad: boolean): number[] | string {
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let value = 0;
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let bits = 0;
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const maxV = (1 << outBits) - 1;
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const result: number[] = [];
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for (let i = 0; i < data.length; ++i) {
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value = (value << inBits) | data[i];
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bits += inBits;
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while (bits >= outBits) {
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bits -= outBits;
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result.push((value >> bits) & maxV);
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}
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}
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if (pad) {
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if (bits > 0) {
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result.push((value << (outBits - bits)) & maxV);
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}
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} else {
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if (bits >= inBits) return "Excess padding";
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if ((value << (outBits - bits)) & maxV) return "Non-zero padding";
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}
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return result;
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}
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function toWords(bytes: ArrayLike<number>): number[] {
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return convert(bytes, 8, 5, true);
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}
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function fromWordsUnsafe(words: ArrayLike<number>): number[] | undefined {
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const res = convert(words, 5, 8, false);
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if (Array.isArray(res)) return res;
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}
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function fromWords(words: ArrayLike<number>): number[] {
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const res = convert(words, 5, 8, false);
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if (Array.isArray(res)) return res;
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throw new Error(res);
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}
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function getLibraryFromEncoding(encoding: "bech32" | "bech32m"): BechLib {
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let ENCODING_CONST: number;
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if (encoding === "bech32") {
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ENCODING_CONST = 1;
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} else {
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ENCODING_CONST = 0x2bc830a3;
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}
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function encode(prefix: string, words: ArrayLike<number>, LIMIT?: number): string {
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LIMIT = LIMIT || 90;
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if (prefix.length + 7 + words.length > LIMIT) throw new TypeError("Exceeds length limit");
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prefix = prefix.toLowerCase();
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// determine chk mod
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let chk = prefixChk(prefix);
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if (typeof chk === "string") throw new Error(chk);
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let result = prefix + "1";
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for (let i = 0; i < words.length; ++i) {
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const x = words[i];
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if (x >> 5 !== 0) throw new Error("Non 5-bit word");
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chk = polymodStep(chk) ^ x;
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result += ALPHABET.charAt(x);
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}
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for (let i = 0; i < 6; ++i) {
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chk = polymodStep(chk);
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}
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chk ^= ENCODING_CONST;
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for (let i = 0; i < 6; ++i) {
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const v = (chk >> ((5 - i) * 5)) & 0x1f;
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result += ALPHABET.charAt(v);
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}
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return result;
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}
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function __decode(str: string, LIMIT?: number): Decoded | string {
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LIMIT = LIMIT || 90;
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if (str.length < 8) return str + " too short";
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if (str.length > LIMIT) return "Exceeds length limit";
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// don't allow mixed case
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const lowered = str.toLowerCase();
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const uppered = str.toUpperCase();
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if (str !== lowered && str !== uppered) return "Mixed-case string " + str;
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str = lowered;
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const split = str.lastIndexOf("1");
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if (split === -1) return "No separator character for " + str;
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if (split === 0) return "Missing prefix for " + str;
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const prefix = str.slice(0, split);
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const wordChars = str.slice(split + 1);
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if (wordChars.length < 6) return "Data too short";
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let chk = prefixChk(prefix);
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if (typeof chk === "string") return chk;
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const words = [];
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for (let i = 0; i < wordChars.length; ++i) {
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const c = wordChars.charAt(i);
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const v = ALPHABET_MAP[c];
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if (v === undefined) return "Unknown character " + c;
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chk = polymodStep(chk) ^ v;
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// not in the checksum?
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if (i + 6 >= wordChars.length) continue;
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words.push(v);
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}
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if (chk !== ENCODING_CONST) return "Invalid checksum for " + str;
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return { prefix, words };
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}
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function decodeUnsafe(str: string, LIMIT?: number): Decoded | undefined {
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const res = __decode(str, LIMIT);
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if (typeof res === "object") return res;
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}
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function decode(str: string, LIMIT?: number): Decoded {
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const res = __decode(str, LIMIT);
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if (typeof res === "object") return res;
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throw new Error(res);
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}
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return {
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decodeUnsafe,
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decode,
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encode,
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toWords,
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fromWordsUnsafe,
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fromWords,
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};
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}
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export const bech32 = getLibraryFromEncoding("bech32");
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export const bech32m = getLibraryFromEncoding("bech32m");
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export interface Decoded {
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prefix: string;
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words: number[];
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}
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export interface BechLib {
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decodeUnsafe: (str: string, LIMIT?: number | undefined) => Decoded | undefined;
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decode: (str: string, LIMIT?: number | undefined) => Decoded;
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encode: (prefix: string, words: ArrayLike<number>, LIMIT?: number | undefined) => string;
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toWords: typeof toWords;
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fromWordsUnsafe: typeof fromWordsUnsafe;
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fromWords: typeof fromWords;
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}
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@ -1,30 +0,0 @@
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const SHORT_TO_HEX: { [key: number]: string } = {};
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const HEX_TO_SHORT: Record<string, number> = {};
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for (let i = 0; i < 256; i++) {
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let encodedByte = i.toString(16).toLowerCase();
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if (encodedByte.length === 1) {
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encodedByte = `0${encodedByte}`;
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}
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SHORT_TO_HEX[i] = encodedByte;
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HEX_TO_SHORT[encodedByte] = i;
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}
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export function fromHex(encoded: string): Uint8Array {
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if (encoded.length % 2 !== 0) {
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throw new Error("Hex encoded strings must have an even number length");
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}
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const out = new Uint8Array(encoded.length / 2);
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for (let i = 0; i < encoded.length; i += 2) {
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const encodedByte = encoded.slice(i, i + 2).toLowerCase();
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if (encodedByte in HEX_TO_SHORT) {
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out[i / 2] = HEX_TO_SHORT[encodedByte];
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} else {
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throw new Error(`Cannot decode unrecognized sequence ${encodedByte} as hexadecimal`);
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}
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}
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return out;
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}
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