add hacky zap implementation

src/components/note/note-reactions-modal.tsx

@@ -17,7 +17,7 @@ import { UserLink } from "../user-link";
 import moment from "moment";
 import { convertTimestampToDate } from "../../helpers/date";
 import { DislikeIcon, LikeIcon } from "../icons";
-import { parseZapNote } from "../../helpers/nip57";
+import { parseZapNote } from "../../helpers/nip-57";
 import { readableAmountInSats } from "../../helpers/bolt11";
 import useEventReactions from "../../hooks/use-event-reactions";
 import useEventZaps from "../../hooks/use-event-zaps";

src/components/note/note-zap-button.tsx

@@ -1,22 +1,127 @@
-import { Button, ButtonProps } from "@chakra-ui/react";
+import { Button, ButtonProps, useToast } from "@chakra-ui/react";
-import { readableAmountInSats } from "../../helpers/bolt11";
+import { makeZapRequest } from "nostr-tools/nip57";
-import { totalZaps } from "../../helpers/nip57";
+import { useMemo, useRef, useState } from "react";
+import { random } from "../../helpers/array";
+import { parsePaymentRequest, readableAmountInSats } from "../../helpers/bolt11";
+import { parseZapNote, totalZaps } from "../../helpers/nip-57";
+import { useCurrentAccount } from "../../hooks/use-current-account";
 import useEventZaps from "../../hooks/use-event-zaps";
 import { useUserMetadata } from "../../hooks/use-user-metadata";
+import { useSigningContext } from "../../providers/signing-provider";
+import clientRelaysService from "../../services/client-relays";
+import { getEventRelays } from "../../services/event-relays";
+import eventZapsService from "../../services/event-zaps";
+import lnurlMetadataService from "../../services/lnurl-metadata";
 import { NostrEvent } from "../../types/nostr-event";
 import { LightningIcon } from "../icons";
 
 export default function NoteZapButton({ note, ...props }: { note: NostrEvent } & Omit<ButtonProps, "children">) {
+  const { requestSignature } = useSigningContext();
+  const account = useCurrentAccount();
   const metadata = useUserMetadata(note.pubkey);
-  const zaps = useEventZaps(note.id, [], true) ?? [];
+  const zaps = useEventZaps(note.id) ?? [];
+  const parsedZaps = useMemo(() => {
+    const parsed = [];
+    for (const zap of zaps) {
+      try {
+        parsed.push(parseZapNote(zap));
+      } catch (e) {}
+    }
+    return parsed;
+  }, [zaps]);
+  const toast = useToast();
+
+  const [loading, setLoading] = useState(false);
+  const timeout = useRef(0);
+  const zapAmount = useRef(0);
+
+  const hasZapped = parsedZaps.some((zapRequest) => zapRequest.request.pubkey === account.pubkey);
+  const tipAddress = metadata?.lud06 ?? metadata?.lud16;
+
+  const handleClick = () => {
+    if (!tipAddress) return;
+    if (timeout.current) {
+      window.clearTimeout(timeout.current);
+    }
+    zapAmount.current += 21;
+    timeout.current = window.setTimeout(async () => {
+      setLoading(true);
+      try {
+        const eventRelays = getEventRelays(note.id).value;
+        const readRelays = clientRelaysService.getReadUrls();
+        const lnurlMetadata = await lnurlMetadataService.requestMetadata(tipAddress);
+        const amount = zapAmount.current * 1000;
+
+        if (lnurlMetadata && lnurlMetadata.allowsNostr && lnurlMetadata.nostrPubkey) {
+          const zapRequest = makeZapRequest({
+            profile: note.pubkey,
+            event: note.id,
+            // pick a random relay from the event and one of our read relays
+            relays: [random(eventRelays), random(readRelays)],
+            amount,
+            comment: "",
+          });
+
+          const signed = await requestSignature(zapRequest);
+          if (signed) {
+            if (amount > lnurlMetadata.maxSendable) throw new Error("amount to large");
+            if (amount < lnurlMetadata.minSendable) throw new Error("amount to small");
+
+            const url = new URL(lnurlMetadata.callback);
+            url.searchParams.append("amount", String(zapAmount.current * 1000));
+            url.searchParams.append("nostr", JSON.stringify(signed));
+
+            const { pr: payRequest } = await fetch(url).then((res) => res.json());
+            if (payRequest as string) {
+              const parsed = parsePaymentRequest(payRequest);
+              if (parsed.amount !== amount) throw new Error("incorrect amount");
+
+              if (window.webln) {
+                await window.webln.enable();
+                await window.webln.sendPayment(payRequest);
+
+                // fetch the zaps again
+                eventZapsService.requestZaps(note.id, readRelays, true);
+              } else {
+                window.addEventListener(
+                  "focus",
+                  () => {
+                    // when the window regains focus, fetch the zaps again
+                    eventZapsService.requestZaps(note.id, readRelays, true);
+                  },
+                  { once: true }
+                );
+                window.open("lightning:" + payRequest);
+              }
+            }
+          }
+        } else {
+          // show standard tipping
+        }
+      } catch (e) {
+        if (e instanceof Error) {
+          console.log(e);
+          toast({
+            status: "error",
+            description: e.message,
+          });
+        }
+      }
+      zapAmount.current = 0;
+      setLoading(false);
+    }, 1500);
+  };
 
   return (
     <Button
       leftIcon={<LightningIcon color="yellow.500" />}
       aria-label="Zap Note"
       title="Zap Note"
+      colorScheme={hasZapped ? "brand" : undefined}
       {...props}
-      isDisabled
+      isLoading={loading}
+      onClick={handleClick}
+      isDisabled={!tipAddress}
     >
       {readableAmountInSats(totalZaps(zaps), false)}
     </Button>

src/helpers/bech32.ts

@@ -6,7 +6,7 @@ export function encodeText(prefix: string, text: string) {
 }
 
 export function decodeText(encoded: string) {
-  const decoded = bech32.decode(encoded);
+  const decoded = bech32.decode(encoded, 256);
   const text = new TextDecoder().decode(new Uint8Array(bech32.fromWords(decoded.words)));
   return {
     text,

src/helpers/lnurl.ts

@@ -8,3 +8,22 @@ export function isLNURL(lnurl: string) {
     return false;
   }
 }
+
+export function parseLub16Address(address: string) {
+  let [name, domain] = address.split("@");
+  if (!name || !domain) return;
+  return `https://${domain}/.well-known/lnurlp/${name}`;
+}
+
+export function parseLNURL(lnurl: string) {
+  const { text, prefix } = decodeText(lnurl);
+
+  return prefix === "lnurl" ? text : undefined;
+}
+
+export function getLudEndpoint(addressOrLNURL: string) {
+  if (addressOrLNURL.includes("@")) {
+    return parseLub16Address(addressOrLNURL);
+  }
+  return parseLNURL(addressOrLNURL);
+}

src/helpers/nip-57.ts

@@ -73,6 +73,7 @@ export function parseZapNote(event: NostrEvent) {
   const eventId = zapRequest.tags.find(isETag)?.[1];
 
   return {
+    zap: event,
     request: zapRequest,
     payment,
     eventId,

src/services/lnurl-metadata.ts

@@ -0,0 +1,49 @@
+import { getLudEndpoint } from "../helpers/lnurl";
+
+type LNURLPMetadata = {
+  callback: string;
+  maxSendable: number;
+  minSendable: number;
+  metadata: string;
+  commentAllowed?: number;
+  tag: "payRequest";
+  allowsNostr?: true;
+  nostrPubkey?: string;
+};
+type LNURLError = {
+  status: "error";
+  message: string;
+};
+
+class LNURLMetadataService {
+  private metadata = new Map<string, LNURLPMetadata>();
+  private pending = new Map<string, Promise<LNURLPMetadata | undefined>>();
+
+  private async fetchMetadata(addressOrLNURL: string) {
+    const url = getLudEndpoint(addressOrLNURL);
+    if (!url) return;
+    try {
+      const metadata = await fetch(url).then((res) => res.json() as Promise<LNURLError | LNURLPMetadata>);
+      if ((metadata as LNURLPMetadata).tag === "payRequest") {
+        return metadata as LNURLPMetadata;
+      }
+    } catch (e) {}
+    this.pending.delete(addressOrLNURL);
+  }
+
+  async requestMetadata(addressOrLNURL: string, alwaysFetch = false) {
+    if (this.metadata.has(addressOrLNURL) && !alwaysFetch) {
+      return this.metadata.get(addressOrLNURL);
+    }
+    if (this.pending.has(addressOrLNURL)) {
+      return this.pending.get(addressOrLNURL);
+    }
+    const promise = this.fetchMetadata(addressOrLNURL);
+    this.pending.set(addressOrLNURL, promise);
+    return await promise;
+  }
+}
+
+const lnurlMetadataService = new LNURLMetadataService();
+
+export default lnurlMetadataService;

src/views/home/popular.tsx

@@ -6,7 +6,7 @@ import { useAppTitle } from "../../hooks/use-app-title";
 import { useReadRelayUrls } from "../../hooks/use-client-relays";
 import { useThrottle } from "react-use";
 import { Kind } from "nostr-tools";
-import { parseZapNote } from "../../helpers/nip57";
+import { parseZapNote } from "../../helpers/nip-57";
 import { NoteLink } from "../../components/note-link";
 
 export default function PopularTab() {

src/views/user/zaps.tsx

@@ -7,7 +7,7 @@ import { UserAvatarLink } from "../../components/user-avatar-link";
 import { UserLink } from "../../components/user-link";
 import { readableAmountInSats } from "../../helpers/bolt11";
 import { convertTimestampToDate } from "../../helpers/date";
-import { isProfileZap, parseZapNote } from "../../helpers/nip57";
+import { isProfileZap, parseZapNote } from "../../helpers/nip-57";
 import { useReadRelayUrls } from "../../hooks/use-client-relays";
 import { useTimelineLoader } from "../../hooks/use-timeline-loader";
 import { NostrEvent } from "../../types/nostr-event";