fix: change page reload and account switch logic (#2975)

plugins/0.setup-users.ts

@@ -5,6 +5,7 @@ import { STORAGE_KEY_USERS } from '~/constants'
 const mock = process.mock
 
 export default defineNuxtPlugin({
+  enforce: 'pre',
   parallel: import.meta.server,
   async setup() {
     const users = useUsers()
@@ -24,11 +25,87 @@ export default defineNuxtPlugin({
     if (import.meta.server) {
       users.value = defaultUsers
     }
-    if (import.meta.client) {
-      await useAsyncIDBKeyval<UserLogin[]>(STORAGE_KEY_USERS, defaultUsers, { deep: true }, users)
-    }
 
     if (removeUsersOnLocalStorage)
       globalThis.localStorage.removeItem(STORAGE_KEY_USERS)
+
+    let callback = noop
+
+    // when multiple tabs: we need to reload window when sign in, switch account or sign out
+    if (import.meta.client) {
+      // prevent reloading on the first visit
+      const initialLoad = ref(true)
+
+      callback = () => (initialLoad.value = false)
+
+      const { readIDB } = await useAsyncIDBKeyval<UserLogin[]>(STORAGE_KEY_USERS, defaultUsers, users)
+
+      function reload() {
+        setTimeout(() => {
+          window.location.reload()
+        }, 0)
+      }
+
+      debouncedWatch(
+        () => [currentUserHandle.value, users.value.length] as const,
+        async ([handle, currentUsers], old) => {
+          if (initialLoad.value) {
+            return
+          }
+
+          const oldHandle = old?.[0]
+
+          // read database users: it is not reactive
+          const dbUsers = await readIDB()
+
+          const numberOfUsers = dbUsers?.length || 0
+
+          // sign in or sign out
+          if (currentUsers !== numberOfUsers) {
+            reload()
+            return
+          }
+
+          let sameAcct: boolean
+          // 1. detect account switching
+          if (oldHandle) {
+            sameAcct = handle === oldHandle
+          }
+          else {
+            const acct = currentUser.value?.account?.acct
+            // 2. detect sign-in?
+            sameAcct = !acct || acct === handle
+          }
+
+          if (!sameAcct) {
+            reload()
+          }
+        },
+        { debounce: 450, flush: 'post', immediate: true },
+      )
+    }
+
+    const { params, query } = useRoute()
+
+    publicServer.value = params.server as string || useRuntimeConfig().public.defaultServer
+
+    const masto = createMasto()
+    const user = (typeof query.server === 'string' && typeof query.token === 'string')
+      ? {
+          server: query.server,
+          token: query.token,
+          vapidKey: typeof query.vapid_key === 'string' ? query.vapid_key : undefined,
+        }
+      : (currentUser.value || { server: publicServer.value })
+
+    if (import.meta.client) {
+      loginTo(masto, user).finally(callback)
+    }
+
+    return {
+      provide: {
+        masto,
+      },
+    }
   },
 })