follow button

src/element/async-button.tsx

@@ -2,7 +2,8 @@ import "./async-button.css";
 import { useState } from "react";
 import Spinner from "element/spinner";
 
-interface AsyncButtonProps extends React.ButtonHTMLAttributes<HTMLButtonElement> {
+interface AsyncButtonProps
+  extends React.ButtonHTMLAttributes<HTMLButtonElement> {
   disabled?: boolean;
   onClick(e: React.MouseEvent): Promise<void> | void;
   children?: React.ReactNode;
@@ -28,8 +29,15 @@ export default function AsyncButton(props: AsyncButtonProps) {
   }
 
   return (
-    <button type="button" disabled={loading || props.disabled} {...props} onClick={handle}>
-      <span style={{ visibility: loading ? "hidden" : "visible" }}>{props.children}</span>
+    <button
+      type="button"
+      disabled={loading || props.disabled}
+      {...props}
+      onClick={handle}
+    >
+      <span style={{ visibility: loading ? "hidden" : "visible" }}>
+        {props.children}
+      </span>
       {loading && (
         <span className="spinner-wrapper">
           <Spinner />

src/element/follow-button.tsx

@@ -1,4 +1,66 @@
-// todo
-export function FollowButton({ pubkey }: { pubkey: string }) {
-  return <button className="btn btn-primary">Follow</button>;
+import { EventKind, EventPublisher } from "@snort/system";
+import { useLogin } from "hooks/login";
+import useFollows from "hooks/follows";
+import AsyncButton from "element/async-button";
+import { System } from "index";
+
+export function LoggedInFollowButton({
+  loggedIn,
+  pubkey,
+}: {
+  loggedIn: string;
+  pubkey: string;
+}) {
+  const { contacts, relays } = useFollows(loggedIn, true);
+  const isFollowing = contacts.find((t) => t.at(1) === pubkey);
+
+  async function unfollow() {
+    const pub = await EventPublisher.nip7();
+    if (pub) {
+      const ev = await pub.generic((eb) => {
+        eb.kind(EventKind.ContactList).content(JSON.stringify(relays));
+        for (const c of contacts) {
+          if (c.at(1) !== pubkey) {
+            eb.tag(c);
+          }
+        }
+        return eb;
+      });
+      console.debug(ev);
+      System.BroadcastEvent(ev);
+    }
+  }
+
+  async function follow() {
+    const pub = await EventPublisher.nip7();
+    if (pub) {
+      const ev = await pub.generic((eb) => {
+        eb.kind(EventKind.ContactList).content(JSON.stringify(relays));
+        for (const tag of contacts) {
+          eb.tag(tag);
+        }
+        eb.tag(["p", pubkey]);
+        return eb;
+      });
+      console.debug(ev);
+      System.BroadcastEvent(ev);
+    }
+  }
+
+  return (
+    <AsyncButton
+      type="button"
+      className="btn btn-primary"
+      onClick={isFollowing ? unfollow : follow}
+    >
+      {isFollowing ? "Unfollow" : "Follow"}
+    </AsyncButton>
+  );
+}
+
+export function FollowButton({ pubkey }: { pubkey: string }) {
+  const login = useLogin();
+  return login?.pubkey ? (
+    <LoggedInFollowButton loggedIn={login.pubkey} pubkey={pubkey} />
+  ) : null;
 }

src/hooks/follows.ts

@@ -0,0 +1,28 @@
+import { useMemo } from "react";
+import { EventKind, ReplaceableNoteStore, RequestBuilder } from "@snort/system";
+import { useRequestBuilder } from "@snort/system-react";
+import { System } from "index";
+
+export default function useFollows(pubkey: string, leaveOpen = false) {
+  const sub = useMemo(() => {
+    const b = new RequestBuilder(`follows:${pubkey.slice(0, 12)}`);
+    b.withOptions({
+      leaveOpen,
+    })
+      .withFilter()
+      .authors([pubkey])
+      .kinds([EventKind.ContactList]);
+    return b;
+  }, [pubkey, leaveOpen]);
+
+  const { data } = useRequestBuilder<ReplaceableNoteStore>(
+    System,
+    ReplaceableNoteStore,
+    sub
+  );
+
+  const contacts = (data?.tags ?? []).filter((t) => t.at(0) === "p");
+  const relays = JSON.parse(data?.content ?? "{}");
+
+  return { contacts, relays };
+}

src/pages/profile-page.tsx

@@ -13,6 +13,7 @@ import { Profile } from "element/profile";
 import { Icon } from "element/icon";
 import { SendZapsDialog } from "element/send-zap";
 import { VideoTile } from "element/video-tile";
+import { FollowButton } from "element/follow-button";
 import { useProfile } from "hooks/profile";
 import useTopZappers from "hooks/top-zappers";
 import { Text } from "element/text";
@@ -81,8 +82,6 @@ export function ProfilePage() {
     }
   }
 
-  // todo: follow
-
   return (
     <div className="profile-page">
       <div className="profile-container">
@@ -125,6 +124,7 @@ export function ProfilePage() {
                 targetName={profile?.name || link.id}
               />
             )}
+            <FollowButton pubkey={link.id} />
           </div>
           <div className="profile-information">
             {profile?.name && <h1 className="name">{profile.name}</h1>}