From 4aafb19f7e8b3a8b1f537b318700adc0f5da906c Mon Sep 17 00:00:00 2001
From: Alejandro Gomez <alejandro@strike.me>
Date: Wed, 28 Jun 2023 10:21:03 +0200
Subject: [PATCH 1/2] feat: mentions

---
 src/element/avatar.tsx     | 17 +++++++
 src/element/hypertext.tsx  | 25 +++++++++++
 src/element/live-chat.css  |  4 ++
 src/element/mention.tsx    | 20 +++++++++
 src/element/nostr-link.tsx | 16 +++++++
 src/element/text.tsx       | 90 +++++++++++++++++++++++++++++++++-----
 src/element/textarea.css   | 14 ++++--
 src/element/textarea.tsx   | 33 +++++++++++++-
 src/utils.ts               | 46 ++++++++++++++++---
 9 files changed, 243 insertions(+), 22 deletions(-)
 create mode 100644 src/element/avatar.tsx
 create mode 100644 src/element/hypertext.tsx
 create mode 100644 src/element/mention.tsx
 create mode 100644 src/element/nostr-link.tsx

diff --git a/src/element/avatar.tsx b/src/element/avatar.tsx
new file mode 100644
index 0000000..1d95a12
--- /dev/null
+++ b/src/element/avatar.tsx
@@ -0,0 +1,17 @@
+import { MetadataCache } from "@snort/system";
+
+export function Avatar({
+  user,
+  avatarClassname,
+}: {
+  user: MetadataCache;
+  avatarClassname: string;
+}) {
+  return (
+    <img
+      className={avatarClassname}
+      alt={user?.name || user?.pubkey}
+      src={user?.picture ?? ""}
+    />
+  );
+}
diff --git a/src/element/hypertext.tsx b/src/element/hypertext.tsx
new file mode 100644
index 0000000..f7b5e46
--- /dev/null
+++ b/src/element/hypertext.tsx
@@ -0,0 +1,25 @@
+import { NostrLink } from "./nostr-link";
+
+interface HyperTextProps {
+  link: string;
+}
+
+export function HyperText({ link }: HyperTextProps) {
+  try {
+    const url = new URL(link);
+    if (url.protocol === "nostr:" || url.protocol === "web+nostr:") {
+      return <NostrLink link={link} />;
+    } else {
+      <a href={link} target="_blank" rel="noreferrer">
+        {link}
+      </a>;
+    }
+  } catch {
+    // Ignore the error.
+  }
+  return (
+    <a href={link} target="_blank" rel="noreferrer">
+      {link}
+    </a>
+  );
+}
diff --git a/src/element/live-chat.css b/src/element/live-chat.css
index abef9de..f517141 100644
--- a/src/element/live-chat.css
+++ b/src/element/live-chat.css
@@ -105,6 +105,10 @@
   color: #F838D9;
 }
 
+.live-chat .message a {
+  color: #F838D9;
+}
+
 .live-chat .profile img {
   width: 24px;
   height: 24px;
diff --git a/src/element/mention.tsx b/src/element/mention.tsx
new file mode 100644
index 0000000..b54ff0c
--- /dev/null
+++ b/src/element/mention.tsx
@@ -0,0 +1,20 @@
+import { useUserProfile } from "@snort/system-react";
+import { System } from "index";
+
+interface MentionProps {
+  pubkey: string;
+  relays?: string[];
+}
+
+export function Mention({ pubkey, relays }: MentionProps) {
+  const user = useUserProfile(System, pubkey);
+  return (
+    <a
+      href={`https://snort.social/p/${pubkey}`}
+      target="_blank"
+      rel="noreferrer"
+    >
+      {user?.name || pubkey}
+    </a>
+  );
+}
diff --git a/src/element/nostr-link.tsx b/src/element/nostr-link.tsx
new file mode 100644
index 0000000..a96f33e
--- /dev/null
+++ b/src/element/nostr-link.tsx
@@ -0,0 +1,16 @@
+import { NostrPrefix, tryParseNostrLink } from "@snort/system";
+import { Mention } from "./mention";
+
+export function NostrLink({ link }: { link: string }) {
+  const nav = tryParseNostrLink(link);
+  if (
+    nav?.type === NostrPrefix.PublicKey ||
+    nav?.type === NostrPrefix.Profile
+  ) {
+    return <Mention pubkey={nav.id} relays={nav.relays} />;
+  } else {
+    <a href={link} target="_blank" rel="noreferrer" className="ext">
+      {link}
+    </a>;
+  }
+}
diff --git a/src/element/text.tsx b/src/element/text.tsx
index d2f8c00..6f6f25e 100644
--- a/src/element/text.tsx
+++ b/src/element/text.tsx
@@ -1,14 +1,84 @@
-import { useMemo } from "react";
-import { TaggedRawEvent } from "@snort/system";
-import { type EmojiTag, Emojify } from "./emoji";
+import { useMemo, type ReactNode } from "react";
+import { TaggedRawEvent, validateNostrLink } from "@snort/system";
+import { splitByUrl } from "utils";
+import { Emoji } from "./emoji";
+import { HyperText } from "./hypertext";
+
+type Fragment = string | ReactNode;
+
+function transformText(fragments: Fragment[], tags: string[][]) {
+  return extractLinks(extractEmoji(fragments, tags));
+}
+
+function extractEmoji(fragments: Fragment[], tags: string[][]) {
+  return fragments
+    .map((f) => {
+      if (typeof f === "string") {
+        return f.split(/:([a-zA-Z_-]):/g).map((i) => {
+          const t = tags.find((a) => a[0] === "emoji" && a[1] === i);
+          if (t) {
+            return <Emoji name={t[1]} url={t[2]} />;
+          } else {
+            return i;
+          }
+        });
+      }
+      return f;
+    })
+    .flat();
+}
+
+function extractLinks(fragments: Fragment[]) {
+  return fragments
+    .map((f) => {
+      if (typeof f === "string") {
+        return splitByUrl(f).map((a) => {
+          const validateLink = () => {
+            const normalizedStr = a.toLowerCase();
+
+            if (
+              normalizedStr.startsWith("web+nostr:") ||
+              normalizedStr.startsWith("nostr:")
+            ) {
+              return validateNostrLink(normalizedStr);
+            }
+
+            return (
+              normalizedStr.startsWith("http:") ||
+              normalizedStr.startsWith("https:") ||
+              normalizedStr.startsWith("magnet:")
+            );
+          };
+
+          if (validateLink()) {
+            if (!a.startsWith("nostr:")) {
+              return (
+                <a
+                  href={a}
+                  onClick={(e) => e.stopPropagation()}
+                  target="_blank"
+                  rel="noreferrer"
+                  className="ext"
+                >
+                  {a}
+                </a>
+              );
+            }
+            return <HyperText link={a} />;
+          }
+          return a;
+        });
+      }
+      return f;
+    })
+    .flat();
+}
 
 export function Text({ ev }: { ev: TaggedRawEvent }) {
-  const emojis = useMemo(() => {
-    return ev.tags.filter((t) => t.at(0) === "emoji").map((t) => t as EmojiTag);
+  // todo: RTL langugage support
+  const element = useMemo(() => {
+    return <span>{transformText([ev.content], ev.tags)}</span>;
   }, [ev]);
-  return (
-    <span>
-      <Emojify content={ev.content} emoji={emojis} />
-    </span>
-  );
+
+  return <>{element}</>;
 }
diff --git a/src/element/textarea.css b/src/element/textarea.css
index 7614ab5..fd7d919 100644
--- a/src/element/textarea.css
+++ b/src/element/textarea.css
@@ -13,21 +13,27 @@
   background: #F838D9;
 }
 
-.emoji-item {
+.emoji-item, .user-item {
   color: white;
   background: #171717;
   display: flex;
   flex-direction: row;
+  gap: 8px;
   align-items: center;
   font-size: 16px;
   padding: 10px;
 }
 
-.emoji-item:hover {
+.emoji-item:hover, .user-item:hover {
   color: #171717;
   background: white;
 }
 
-.emoji-item .emoji-image {
-  margin: 0 8px;
+.user-image {
+  width: 21px;
+  height: 21px;
+  border-radius: 100%;
+}
+
+.user-details {
 }
diff --git a/src/element/textarea.tsx b/src/element/textarea.tsx
index 344b778..49921d3 100644
--- a/src/element/textarea.tsx
+++ b/src/element/textarea.tsx
@@ -1,10 +1,14 @@
 import "./textarea.css";
+import type { KeyboardEvent, ChangeEvent } from "react";
 import ReactTextareaAutocomplete from "@webscopeio/react-textarea-autocomplete";
 import "@webscopeio/react-textarea-autocomplete/style.css";
-import type { KeyboardEvent, ChangeEvent } from "react";
-import { Emoji, type EmojiTag } from "./emoji";
 import uniqWith from "lodash/uniqWith";
 import isEqual from "lodash/isEqual";
+import { MetadataCache, NostrPrefix } from "@snort/system";
+import { System } from "index";
+import { Emoji, type EmojiTag } from "./emoji";
+import { Avatar } from "element/avatar";
+import { hexToBech32 } from "utils";
 
 interface EmojiItemProps {
   name: string;
@@ -22,6 +26,16 @@ const EmojiItem = ({ entity: { name, url } }: { entity: EmojiItemProps }) => {
   );
 };
 
+const UserItem = (metadata: MetadataCache) => {
+  const { pubkey, display_name, nip05, ...rest } = metadata;
+  return (
+    <div key={pubkey} className="user-item">
+      <Avatar avatarClassname="user-image" user={metadata} />
+      <div className="user-details">{display_name || rest.name}</div>
+    </div>
+  );
+};
+
 interface TextareaProps {
   emojis: EmojiTag[];
   value: string;
@@ -30,6 +44,11 @@ interface TextareaProps {
 }
 
 export function Textarea({ emojis, ...props }: TextareaProps) {
+  const userDataProvider = async (token: string) => {
+    // @ts-expect-error: Property 'search'
+    return System.ProfileLoader.Cache.search(token);
+  };
+
   const emojiDataProvider = async (token: string) => {
     const results = emojis
       .map((t) => {
@@ -41,12 +60,22 @@ export function Textarea({ emojis, ...props }: TextareaProps) {
       .filter(({ name }) => name.toLowerCase().includes(token.toLowerCase()));
     return uniqWith(results, isEqual).slice(0, 5);
   };
+
   const trigger = {
     ":": {
       dataProvider: emojiDataProvider,
       component: EmojiItem,
       output: (item: EmojiItemProps) => `:${item.name}:`,
     },
+    "@": {
+      afterWhitespace: true,
+      dataProvider: userDataProvider,
+      component: (props: { entity: MetadataCache }) => (
+        <UserItem {...props.entity} />
+      ),
+      output: (item: { pubkey: string }) =>
+        `@${hexToBech32(NostrPrefix.PublicKey, item.pubkey)}`,
+    },
   };
 
   return (
diff --git a/src/utils.ts b/src/utils.ts
index 11ce148..2aaa0a8 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -1,8 +1,42 @@
-import { NostrEvent } from "@snort/system";
+import { NostrEvent, NostrPrefix, encodeTLV } from "@snort/system";
+import * as utils from "@noble/curves/abstract/utils";
+import { bech32 } from "@scure/base";
 
 export function findTag(e: NostrEvent | undefined, tag: string) {
-    const maybeTag = e?.tags.find(evTag => {
-        return evTag[0] === tag;
-    });
-    return maybeTag && maybeTag[1];
-}
\ No newline at end of file
+  const maybeTag = e?.tags.find((evTag) => {
+    return evTag[0] === tag;
+  });
+  return maybeTag && maybeTag[1];
+}
+
+/**
+ * Convert hex to bech32
+ */
+export function hexToBech32(hrp: string, hex?: string) {
+  if (typeof hex !== "string" || hex.length === 0 || hex.length % 2 !== 0) {
+    return "";
+  }
+
+  try {
+    if (
+      hrp === NostrPrefix.Note ||
+      hrp === NostrPrefix.PrivateKey ||
+      hrp === NostrPrefix.PublicKey
+    ) {
+      const buf = utils.hexToBytes(hex);
+      return bech32.encode(hrp, bech32.toWords(buf));
+    } else {
+      return encodeTLV(hrp as NostrPrefix, hex);
+    }
+  } catch (e) {
+    console.warn("Invalid hex", hex, e);
+    return "";
+  }
+}
+
+export function splitByUrl(str: string) {
+  const urlRegex =
+    /((?:http|ftp|https|nostr|web\+nostr|magnet):\/?\/?(?:[\w+?.\w+])+(?:[a-zA-Z0-9~!@#$%^&*()_\-=+\\/?.:;',]*)?(?:[-A-Za-z0-9+&@#/%=~()_|]))/i;
+
+  return str.split(urlRegex);
+}
-- 
2.45.2


From a3c486d9e4f6bda3a5a787a5e3c6db7c6b4ffcfc Mon Sep 17 00:00:00 2001
From: Alejandro Gomez <alejandro@strike.me>
Date: Wed, 28 Jun 2023 11:09:12 +0200
Subject: [PATCH 2/2] fix: don't add duplicate emoji tags

---
 src/element/live-chat.tsx | 16 +++++++++++-----
 src/element/text.tsx      |  2 +-
 2 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/src/element/live-chat.tsx b/src/element/live-chat.tsx
index 2aa6691..ece4367 100644
--- a/src/element/live-chat.tsx
+++ b/src/element/live-chat.tsx
@@ -186,20 +186,26 @@ function WriteMessage({ link }: { link: NostrLink }) {
   async function sendChatMessage() {
     const pub = await EventPublisher.nip7();
     if (chat.length > 1) {
-      let messageEmojis: string[][] = [];
+      let emojiNames = new Set();
+
       for (const name of names) {
         if (chat.includes(`:${name}:`)) {
-          const e = emojis.find((t) => t.at(1) === name);
-          messageEmojis.push(e as string[]);
+          emojiNames.add(name);
         }
       }
+
       const reply = await pub?.generic((eb) => {
+        const emoji = [...emojiNames].map((name) =>
+          emojis.find((e) => e.at(1) === name)
+        );
         eb.kind(1311 as EventKind)
           .content(chat)
           .tag(["a", `${link.kind}:${link.author}:${link.id}`, "", "root"])
           .processContent();
-        for (const e of messageEmojis) {
-          eb.tag(e);
+        for (const e of emoji) {
+          if (e) {
+            eb.tag(e);
+          }
         }
         return eb;
       });
diff --git a/src/element/text.tsx b/src/element/text.tsx
index 6f6f25e..e722d55 100644
--- a/src/element/text.tsx
+++ b/src/element/text.tsx
@@ -14,7 +14,7 @@ function extractEmoji(fragments: Fragment[], tags: string[][]) {
   return fragments
     .map((f) => {
       if (typeof f === "string") {
-        return f.split(/:([a-zA-Z_-]):/g).map((i) => {
+        return f.split(/:([\w-]+):/g).map((i) => {
           const t = tags.find((a) => a[0] === "emoji" && a[1] === i);
           if (t) {
             return <Emoji name={t[1]} url={t[2]} />;
-- 
2.45.2