From a2b7b13b7199b1ed130fa5165471ac8296c4447c Mon Sep 17 00:00:00 2001
From: userAdityaa <aditya.chaudhary1558@gmail.com>
Date: Fri, 29 May 2026 18:08:23 +0530
Subject: [PATCH] feat: sync checked read state to Dufflepud for cross-device
 badges

---
 src/app/util/notifications.ts | 111 ++++++++++++++++++++++++++++++++--
 src/routes/+layout.svelte     |   3 +
 2 files changed, 110 insertions(+), 4 deletions(-)

diff --git a/src/app/util/notifications.ts b/src/app/util/notifications.ts
index 0bc5cb3c..a3b9b781 100644
--- a/src/app/util/notifications.ts
+++ b/src/app/util/notifications.ts
@@ -1,11 +1,11 @@
 import {derived, get, writable} from "svelte/store"
 import {Badge} from "@capawesome/capacitor-badge"
 import {synced, throttled, withGetter} from "@welshman/store"
-import {pubkey, tracker, repository, relaysByUrl} from "@welshman/app"
-import {assoc, prop, first, identity, groupBy, now} from "@welshman/lib"
-import type {TrustedEvent} from "@welshman/util"
+import {pubkey, signer, tracker, repository, relaysByUrl} from "@welshman/app"
+import {assoc, prop, first, identity, groupBy, now, throttle} from "@welshman/lib"
+import type {SignedEvent, TrustedEvent} from "@welshman/util"
 import {deriveEventsByIdByUrl} from "@welshman/store"
-import {sortEventsDesc, getTagValue, MESSAGE} from "@welshman/util"
+import {sortEventsDesc, getTagValue, MESSAGE, makeEvent} from "@welshman/util"
 import {makeSpacePath, makeRoomPath, makeSpaceChatPath, makeChatPath} from "@app/util/routes"
 import {
   CONTENT_KINDS,
@@ -15,6 +15,8 @@ import {
   getSpaceUrlsFromGroupList,
   makeCommentFilter,
   hasNip29,
+  dufflepud,
+  DUFFLEPUD_URL,
 } from "@app/core/state"
 import {kv} from "@app/core/storage"
 import {page} from "$app/stores"
@@ -76,6 +78,107 @@ export const syncChecked = () => {
   })
 }
 
+const HTTP_AUTH = 27235
+const CHECKED_KV_KEY = "checked"
+const NIP98_MAX_AGE = 23 * 60 * 60
+
+let nip98Auth: SignedEvent | undefined
+
+const nip98Header = async () => {
+  const $signer = signer.get()
+
+  if (!$signer) {
+    return undefined
+  }
+
+  if (!nip98Auth || now() - nip98Auth.created_at > NIP98_MAX_AGE) {
+    nip98Auth = await $signer.sign(
+      makeEvent(HTTP_AUTH, {content: "", tags: [["u", DUFFLEPUD_URL]]}),
+    )
+  }
+
+  return `Nostr ${btoa(JSON.stringify(nip98Auth))}`
+}
+
+const pullCheckedRemote = async () => {
+  const authorization = await nip98Header()
+
+  if (!authorization) {
+    return
+  }
+
+  try {
+    const res = await fetch(dufflepud(`kv/${CHECKED_KV_KEY}`), {headers: {authorization}})
+
+    if (res.status === 404) {
+      return
+    }
+
+    if (!res.ok) {
+      return
+    }
+
+    const remote = JSON.parse(await res.text()) as Record<string, number>
+
+    checked.update($checked => {
+      for (const [path, ts] of Object.entries(remote)) {
+        if (ts > ($checked[path] || 0)) {
+          $checked[path] = ts
+        }
+      }
+
+      return $checked
+    })
+  } catch {
+    // pass
+  }
+}
+
+const pushCheckedRemote = throttle(3000, async () => {
+  const authorization = await nip98Header()
+
+  if (!authorization) {
+    return
+  }
+
+  try {
+    await fetch(dufflepud(`kv/${CHECKED_KV_KEY}`), {
+      method: "POST",
+      headers: {authorization},
+      body: JSON.stringify(checked.get()),
+    })
+  } catch {
+    // pass
+  }
+})
+
+export const syncCheckedRemote = () => {
+  let ready = false
+
+  const unsubscribePubkey = pubkey.subscribe($pubkey => {
+    ready = false
+    nip98Auth = undefined
+
+    if ($pubkey) {
+      pullCheckedRemote().then(() => {
+        ready = true
+        pushCheckedRemote()
+      })
+    }
+  })
+
+  const unsubscribeChecked = checked.subscribe(() => {
+    if (ready && pubkey.get()) {
+      pushCheckedRemote()
+    }
+  })
+
+  return () => {
+    unsubscribePubkey()
+    unsubscribeChecked()
+  }
+}
+
 // Derived notifications state
 
 export const allNotifications = derived(
diff --git a/src/routes/+layout.svelte b/src/routes/+layout.svelte
index 42b3f197..a855b2b3 100644
--- a/src/routes/+layout.svelte
+++ b/src/routes/+layout.svelte
@@ -174,6 +174,9 @@
     // Subscribe to page history to update checked state
     unsubscribers.push(notifications.syncChecked())
 
+    // Sync checked state across devices
+    unsubscribers.push(notifications.syncCheckedRemote())
+
     // Initialize background notifications
     unsubscribers.push(notifications.Push.sync())