feat: add hint to e tags

src/lib/draft-event.ts

@@ -1,4 +1,5 @@
 import { COMMENT_EVENT_KIND, PICTURE_EVENT_KIND } from '@/constants'
+import client from '@/services/client.service'
 import { TDraftEvent, TMailboxRelay, TRelaySet } from '@/types'
 import dayjs from 'dayjs'
 import { Event, kinds } from 'nostr-tools'
@@ -14,12 +15,14 @@ import {
 // https://github.com/nostr-protocol/nips/blob/master/25.md
 export function createReactionDraftEvent(event: Event): TDraftEvent {
   const tags = event.tags.filter((tag) => tag.length >= 2 && ['e', 'p'].includes(tag[0]))
-  tags.push(['e', event.id])
+
+  const hint = client.getEventHint(event.id)
+  tags.push(['e', event.id, hint, event.pubkey])
   tags.push(['p', event.pubkey])
   tags.push(['k', event.kind.toString()])
 
   if (isReplaceable(event.kind)) {
-    tags.push(['a', getEventCoordinate(event)])
+    tags.push(hint ? ['a', getEventCoordinate(event), hint] : ['a', getEventCoordinate(event)])
   }
 
   return {
@@ -33,7 +36,7 @@ export function createReactionDraftEvent(event: Event): TDraftEvent {
 // https://github.com/nostr-protocol/nips/blob/master/18.md
 export function createRepostDraftEvent(event: Event): TDraftEvent {
   const tags = [
-    ['e', event.id], // TODO: url
+    ['e', event.id, client.getEventHint(event.id), event.pubkey],
     ['p', event.pubkey]
   ]
 
@@ -60,16 +63,16 @@ export async function createShortTextNoteDraftEvent(
 
   const tags = pubkeys
     .map((pubkey) => ['p', pubkey])
-    .concat(otherRelatedEventIds.map((eventId) => ['e', eventId]))
-    .concat(quoteEventIds.map((eventId) => ['q', eventId, '', 'mention']))
+    .concat(otherRelatedEventIds.map((eventId) => ['e', eventId, client.getEventHint(eventId)]))
+    .concat(quoteEventIds.map((eventId) => ['q', eventId, client.getEventHint(eventId)]))
     .concat(hashtags.map((hashtag) => ['t', hashtag]))
 
   if (rootEventId) {
-    tags.push(['e', rootEventId, '', 'root'])
+    tags.push(['e', rootEventId, client.getEventHint(rootEventId), 'root'])
   }
 
   if (parentEventId) {
-    tags.push(['e', parentEventId, '', 'reply'])
+    tags.push(['e', parentEventId, client.getEventHint(parentEventId), 'reply'])
   }
 
   const { images } = extractImagesFromContent(content)
@@ -124,7 +127,7 @@ export async function createPictureNoteDraftEvent(
   const tags = pictureInfos
     .map((info) => ['imeta', ...info.tags.map(([n, v]) => `${n} ${v}`)])
     .concat(pubkeys.map((pubkey) => ['p', pubkey]))
-    .concat(quoteEventIds.map((eventId) => ['q', eventId]))
+    .concat(quoteEventIds.map((eventId) => ['q', eventId, client.getEventHint(eventId)]))
     .concat(hashtags.map((hashtag) => ['t', hashtag]))
 
   if (options.addClientTag) {
@@ -165,15 +168,15 @@ export async function createCommentDraftEvent(
   const hashtags = extractHashtags(content)
 
   const tags = [
-    ['E', rootEventId],
+    ['E', rootEventId, client.getEventHint(rootEventId), rootEventPubkey],
     ['K', rootEventKind.toString()],
     ['P', rootEventPubkey],
-    ['e', parentEventId],
+    ['e', parentEventId, client.getEventHint(parentEventId), parentEventPubkey],
     ['k', parentEventKind.toString()],
     ['p', parentEventPubkey]
   ]
     .concat(pubkeys.map((pubkey) => ['p', pubkey]))
-    .concat(quoteEventIds.map((eventId) => ['q', eventId]))
+    .concat(quoteEventIds.map((eventId) => ['q', eventId, client.getEventHint(eventId)]))
     .concat(hashtags.map((hashtag) => ['t', hashtag]))
 
   const { images } = extractImagesFromContent(content)

src/lib/url.ts

@@ -31,6 +31,47 @@ export function simplifyUrl(url: string): string {
   return url.replace('wss://', '').replace('ws://', '').replace(/\/$/, '')
 }
 
+export function isLocalNetworkUrl(urlString: string): boolean {
+  try {
+    const url = new URL(urlString)
+    const hostname = url.hostname
+
+    // Check if it's localhost
+    if (hostname === 'localhost' || hostname === '::1') {
+      return true
+    }
+
+    // Check if it's an IPv4 local network address
+    const ipv4Match = hostname.match(/^(\d+)\.(\d+)\.(\d+)\.(\d+)$/)
+    if (ipv4Match) {
+      const [, a, b, c, d] = ipv4Match.map(Number)
+      return (
+        a === 10 ||
+        (a === 172 && b >= 16 && b <= 31) ||
+        (a === 192 && b === 168) ||
+        (a === 127 && b === 0 && c === 0 && d === 1)
+      )
+    }
+
+    // Check if it's an IPv6 address
+    if (hostname.includes(':')) {
+      if (hostname === '::1') {
+        return true // IPv6 loopback address
+      }
+      if (hostname.startsWith('fe80:')) {
+        return true // Link-local address
+      }
+      if (hostname.startsWith('fc') || hostname.startsWith('fd')) {
+        return true // Unique local address (ULA)
+      }
+    }
+
+    return false
+  } catch {
+    return false // Return false for invalid URLs
+  }
+}
+
 export function isImage(url: string) {
   try {
     const imageExtensions = ['.jpg', '.jpeg', '.png', '.gif', '.webp', '.heic', '.svg']

src/services/client.service.ts

@@ -2,6 +2,7 @@ import { BIG_RELAY_URLS } from '@/constants'
 import { getProfileFromProfileEvent, getRelayListFromRelayListEvent } from '@/lib/event'
 import { formatPubkey, userIdToPubkey } from '@/lib/pubkey'
 import { extractPubkeysFromEventTags } from '@/lib/tag'
+import { isLocalNetworkUrl } from '@/lib/url'
 import { TDraftEvent, TProfile, TRelayInfo, TRelayList } from '@/types'
 import { sha256 } from '@noble/hashes/sha2'
 import DataLoader from 'dataloader'
@@ -559,6 +560,11 @@ class ClientService extends EventTarget {
     return this.getSeenEventRelays(eventId).map((relay) => relay.url)
   }
 
+  getEventHint(eventId: string) {
+    const relayUrls = this.getSeenEventRelayUrls(eventId)
+    return relayUrls.find((url) => !isLocalNetworkUrl(url)) ?? ''
+  }
+
   trackEventSeenOn(eventId: string, relay: AbstractRelay) {
     let set = this.pool.seenOn.get(eventId)
     if (!set) {