Merge pull request 'feat: added caching using browsers built in index db' (#96) from issue-69 into staging

Reviewed-on: https://git.sigit.io/sig/it/pulls/96
Reviewed-by: Leonardo Davinci <m@noreply.git.sigit.io>

package-lock.json

@@ -21,6 +21,7 @@
         "crypto-js": "^4.2.0",
         "dnd-core": "16.0.1",
         "file-saver": "2.0.5",
+        "idb": "8.0.0",
         "jszip": "3.10.1",
         "lodash": "4.17.21",
         "mui-file-input": "4.0.4",
@@ -50,7 +51,8 @@
         "prettier": "3.2.5",
         "ts-css-modules-vite-plugin": "1.0.20",
         "typescript": "^5.2.2",
-        "vite": "^5.1.4"
+        "vite": "^5.1.4",
+        "vite-tsconfig-paths": "4.3.2"
       }
     },
     "node_modules/@aashutoshrathi/word-wrap": {
@@ -3554,6 +3556,12 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/globrex": {
+      "version": "0.1.2",
+      "resolved": "https://registry.npmjs.org/globrex/-/globrex-0.1.2.tgz",
+      "integrity": "sha512-uHJgbwAMwNFf5mLst7IWLNg14x1CkeqglJb/K3doi4dw6q2IvAAmM/Y81kevy83wP+Sst+nutFTYOGg3d1lsxg==",
+      "dev": true
+    },
     "node_modules/graphemer": {
       "version": "1.4.0",
       "resolved": "https://registry.npmjs.org/graphemer/-/graphemer-1.4.0.tgz",
@@ -3592,6 +3600,11 @@
       "resolved": "https://registry.npmjs.org/react-is/-/react-is-16.13.1.tgz",
       "integrity": "sha512-24e6ynE2H+OKt4kqsOvNd8kBpV65zoxbA4BVsEOB3ARVWQki/DHzaUoC5KuON/BiccDaCCTZBuOcfZs70kR8bQ=="
     },
+    "node_modules/idb": {
+      "version": "8.0.0",
+      "resolved": "https://registry.npmjs.org/idb/-/idb-8.0.0.tgz",
+      "integrity": "sha512-l//qvlAKGmQO31Qn7xdzagVPPaHTxXx199MhrAFuVBTPqydcPYBWjkrbv4Y0ktB+GmWOiwHl237UUOrLmQxLvw=="
+    },
     "node_modules/ignore": {
       "version": "5.3.1",
       "resolved": "https://registry.npmjs.org/ignore/-/ignore-5.3.1.tgz",
@@ -4992,6 +5005,26 @@
         }
       }
     },
+    "node_modules/tsconfck": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/tsconfck/-/tsconfck-3.1.0.tgz",
+      "integrity": "sha512-CMjc5zMnyAjcS9sPLytrbFmj89st2g+JYtY/c02ug4Q+CZaAtCgbyviI0n1YvjZE/pzoc6FbNsINS13DOL1B9w==",
+      "dev": true,
+      "bin": {
+        "tsconfck": "bin/tsconfck.js"
+      },
+      "engines": {
+        "node": "^18 || >=20"
+      },
+      "peerDependencies": {
+        "typescript": "^5.0.0"
+      },
+      "peerDependenciesMeta": {
+        "typescript": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/tseep": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/tseep/-/tseep-1.2.1.tgz",
@@ -5197,6 +5230,25 @@
         }
       }
     },
+    "node_modules/vite-tsconfig-paths": {
+      "version": "4.3.2",
+      "resolved": "https://registry.npmjs.org/vite-tsconfig-paths/-/vite-tsconfig-paths-4.3.2.tgz",
+      "integrity": "sha512-0Vd/a6po6Q+86rPlntHye7F31zA2URZMbH8M3saAZ/xR9QoGN/L21bxEGfXdWmFdNkqPpRdxFT7nmNe12e9/uA==",
+      "dev": true,
+      "dependencies": {
+        "debug": "^4.1.1",
+        "globrex": "^0.1.2",
+        "tsconfck": "^3.0.3"
+      },
+      "peerDependencies": {
+        "vite": "*"
+      },
+      "peerDependenciesMeta": {
+        "vite": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/web-streams-polyfill": {
       "version": "3.3.3",
       "resolved": "https://registry.npmjs.org/web-streams-polyfill/-/web-streams-polyfill-3.3.3.tgz",

package.json

@@ -27,6 +27,7 @@
     "crypto-js": "^4.2.0",
     "dnd-core": "16.0.1",
     "file-saver": "2.0.5",
+    "idb": "8.0.0",
     "jszip": "3.10.1",
     "lodash": "4.17.21",
     "mui-file-input": "4.0.4",
@@ -56,6 +57,7 @@
     "prettier": "3.2.5",
     "ts-css-modules-vite-plugin": "1.0.20",
     "typescript": "^5.2.2",
-    "vite": "^5.1.4"
+    "vite": "^5.1.4",
+    "vite-tsconfig-paths": "4.3.2"
   }
 }

src/components/AppBar/AppBar.tsx

@@ -28,6 +28,7 @@ import {
 } from '../../routes'
 import {
   clearAuthToken,
+  hexToNpub,
   saveNsecBunkerDelegatedKey,
   shorten
 } from '../../utils'
@@ -60,13 +61,17 @@ export const AppBar = () => {
           setUserAvatar(picture || userRobotImage)
         }
 
-        setUsername(shorten(display_name || name || '', 7))
+        const npub = authState.usersPubkey
+          ? hexToNpub(authState.usersPubkey)
+          : ''
+
+        setUsername(shorten(display_name || name || npub, 7))
       } else {
         setUserAvatar(userRobotImage || '')
         setUsername('')
       }
     }
-  }, [metadataState, userRobotImage])
+  }, [metadataState, userRobotImage, authState.usersPubkey])
 
   const handleOpenUserMenu = (event: React.MouseEvent<HTMLElement>) => {
     setAnchorElUser(event.currentTarget)
@@ -172,13 +177,13 @@ export const AppBar = () => {
                   onClick={() => {
                     setAnchorElUser(null)
 
-                    navigate(appPrivateRoutes.relays)
+                    navigate(appPrivateRoutes.settings)
                   }}
                   sx={{
                     justifyContent: 'center'
                   }}
                 >
-                  Relays
+                  Settings
                 </MenuItem>
                 <Link
                   to={appPublicRoutes.source}

src/controllers/MetadataController.ts

@@ -14,71 +14,130 @@ import { NostrController } from '.'
 import { toast } from 'react-toastify'
 import { queryNip05 } from '../utils'
 import NDK, { NDKEvent, NDKSubscription } from '@nostr-dev-kit/ndk'
+import { EventEmitter } from 'tseep'
+import { localCache } from '../services'
 
-export class MetadataController {
+export class MetadataController extends EventEmitter {
   private nostrController: NostrController
   private specialMetadataRelay = 'wss://purplepag.es'
 
   constructor() {
+    super()
     this.nostrController = NostrController.getInstance()
   }
 
-  public getEmptyMetadataEvent = (): Event => {
-    return {
-      content: '',
-      created_at: new Date().valueOf(),
-      id: '',
-      kind: 0,
-      pubkey: '',
-      sig: '',
-      tags: []
-    }
-  }
-
-  public findMetadata = async (hexKey: string) => {
+  /**
+   * Asynchronously checks for more recent metadata events authored by a specific key.
+   * If a more recent metadata event is found, it is handled and returned.
+   * If no more recent event is found, the current event is returned.
+   * @param hexKey The hexadecimal key of the author to filter metadata events.
+   * @param currentEvent The current metadata event, if any, to compare with newer events.
+   * @returns A promise resolving to the most recent metadata event found, or null if none is found.
+   */
+  private async checkForMoreRecentMetadata(
+    hexKey: string,
+    currentEvent: Event | null
+  ): Promise<Event | null> {
+    // Define the event filter to only include metadata events authored by the given key
     const eventFilter: Filter = {
-      kinds: [kinds.Metadata],
-      authors: [hexKey]
+      kinds: [kinds.Metadata], // Only metadata events
+      authors: [hexKey] // Authored by the specified key
     }
 
     const pool = new SimplePool()
 
+    // Try to get the metadata event from a special relay (wss://purplepag.es)
     const metadataEvent = await pool
       .get([this.specialMetadataRelay], eventFilter)
       .catch((err) => {
-        console.error(err)
-        return null
+        console.error(err) // Log any errors
+        return null // Return null if an error occurs
       })
 
+    // If a valid metadata event is found from the special relay
     if (
       metadataEvent &&
-      validateEvent(metadataEvent) &&
-      verifyEvent(metadataEvent)
+      validateEvent(metadataEvent) && // Validate the event
+      verifyEvent(metadataEvent) // Verify the event's authenticity
     ) {
-      return metadataEvent
+      // If there's no current event or the new metadata event is more recent
+      if (!currentEvent || metadataEvent.created_at > currentEvent.created_at) {
+        // Handle the new metadata event
+        this.handleNewMetadataEvent(metadataEvent)
+        return metadataEvent
+      }
     }
 
+    // If no valid metadata event is found from the special relay, get the most popular relays
     const mostPopularRelays = await this.nostrController.getMostPopularRelays()
 
+    // Query the most popular relays for metadata events
     const events = await pool
       .querySync(mostPopularRelays, eventFilter)
       .catch((err) => {
-        console.error(err)
-
-        return null
+        console.error(err) // Log any errors
+        return null // Return null if an error occurs
       })
 
+    // If events are found from the popular relays
     if (events && events.length) {
-      events.sort((a, b) => b.created_at - a.created_at)
+      events.sort((a, b) => b.created_at - a.created_at) // Sort events by creation date (descending)
 
+      // Iterate through the events
       for (const event of events) {
-        if (validateEvent(event) && verifyEvent(event)) {
+        // If the event is valid, authentic, and more recent than the current event
+        if (
+          validateEvent(event) &&
+          verifyEvent(event) &&
+          (!currentEvent || event.created_at > currentEvent.created_at)
+        ) {
+          // Handle the new metadata event
+          this.handleNewMetadataEvent(event)
           return event
         }
       }
     }
 
-    throw new Error('Mo metadata found.')
+    return currentEvent // Return the current event if no newer event is found
+  }
+
+  /**
+   * Handle new metadata events and emit them to subscribers
+   */
+  private async handleNewMetadataEvent(event: VerifiedEvent) {
+    // update the event in local cache
+    localCache.addUserMetadata(event)
+    // Emit the event to subscribers.
+    this.emit(event.pubkey, event.kind, event)
+  }
+
+  /**
+   * Finds metadata for a given hexadecimal key.
+   *
+   * @param hexKey - The hexadecimal key to search for metadata.
+   * @returns A promise that resolves to the metadata event.
+   */
+  public findMetadata = async (hexKey: string): Promise<Event | null> => {
+    // Attempt to retrieve the metadata event from the local cache
+    const cachedMetadataEvent = await localCache.getUserMetadata(hexKey)
+
+    // If cached metadata is found, check its validity
+    if (cachedMetadataEvent) {
+      const oneDayInMS = 24 * 60 * 60 * 1000 // Number of milliseconds in one day
+
+      // Check if the cached metadata is older than one day
+      if (Date.now() - cachedMetadataEvent.cachedAt > oneDayInMS) {
+        // If older than one day, find the metadata from relays in background
+
+        this.checkForMoreRecentMetadata(hexKey, cachedMetadataEvent.event)
+      }
+
+      // Return the cached metadata event
+      return cachedMetadataEvent.event
+    }
+
+    // If no cached metadata is found, retrieve it from relays
+    return this.checkForMoreRecentMetadata(hexKey, null)
   }
 
   public findRelayListMetadata = async (hexKey: string) => {
@@ -142,7 +201,7 @@ export class MetadataController {
     throw new Error('No relay list metadata found.')
   }
 
-  public extractProfileMetadataContent = (event: VerifiedEvent) => {
+  public extractProfileMetadataContent = (event: Event) => {
     try {
       if (!event.content) return {}
       return JSON.parse(event.content) as ProfileMetadata
@@ -175,6 +234,7 @@ export class MetadataController {
       .publishEvent(signedMetadataEvent, [this.specialMetadataRelay])
       .then((relays) => {
         toast.success(`Metadata event published on: ${relays.join('\n')}`)
+        this.handleNewMetadataEvent(signedMetadataEvent as VerifiedEvent)
       })
       .catch((err) => {
         toast.error(err.message)
@@ -193,6 +253,8 @@ export class MetadataController {
       userRelays.push(...relaySet.write)
     } else {
       const metadata = await this.findMetadata(hexKey)
+      if (!metadata) return null
+
       const metadataContent = this.extractProfileMetadataContent(metadata)
 
       if (metadataContent?.nip05) {
@@ -306,4 +368,16 @@ export class MetadataController {
   }
 
   public validate = (event: Event) => validateEvent(event) && verifyEvent(event)
+
+  public getEmptyMetadataEvent = (): Event => {
+    return {
+      content: '',
+      created_at: new Date().valueOf(),
+      id: '',
+      kind: 0,
+      pubkey: '',
+      sig: '',
+      tags: []
+    }
+  }
 }

src/layouts/Main.tsx

@@ -18,8 +18,7 @@ import { MetadataController, NostrController } from '../controllers'
 import { LoginMethods } from '../store/auth/types'
 import { setUserRobotImage } from '../store/userRobotImage/action'
 import { State } from '../store/rootReducer'
-
-const metadataController = new MetadataController()
+import { Event, kinds } from 'nostr-tools'
 
 export const MainLayout = () => {
   const dispatch: Dispatch = useDispatch()
@@ -27,6 +26,8 @@ export const MainLayout = () => {
   const authState = useSelector((state: State) => state.auth)
 
   useEffect(() => {
+    const metadataController = new MetadataController()
+
     const logout = () => {
       dispatch(
         setAuthState({
@@ -68,6 +69,20 @@ export const MainLayout = () => {
             nostrController.createNsecBunkerSigner(usersPubkey)
           })
         }
+
+        const handleMetadataEvent = (event: Event) => {
+          dispatch(setMetadataEvent(event))
+        }
+
+        metadataController.on(usersPubkey, (kind: number, event: Event) => {
+          if (kind === kinds.Metadata) {
+            handleMetadataEvent(event)
+          }
+        })
+
+        metadataController.findMetadata(usersPubkey).then((metadataEvent) => {
+          if (metadataEvent) handleMetadataEvent(metadataEvent)
+        })
       }
     }
 

src/pages/create/index.tsx

@@ -35,6 +35,7 @@ import {
   generateEncryptionKey,
   getHash,
   hexToNpub,
+  isOnline,
   npubToHex,
   queryNip05,
   sendDM,
@@ -49,6 +50,7 @@ import type { Identifier, XYCoord } from 'dnd-core'
 import { useDrag, useDrop } from 'react-dnd'
 import saveAs from 'file-saver'
 import CopyModal from '../../components/copyModal'
+import { Event, kinds } from 'nostr-tools'
 
 export const CreatePage = () => {
   const navigate = useNavigate()
@@ -337,7 +339,7 @@ export const CreatePage = () => {
 
     const blob = new Blob([encryptedArrayBuffer])
 
-    if (navigator.onLine) {
+    if (await isOnline()) {
       setIsLoading(true)
       setLoadingSpinnerDesc('Uploading zip file to file storage.')
       const fileUrl = await uploadToFileStorage(blob, nostrController)
@@ -517,16 +519,26 @@ const DisplayUser = ({
       if (!(user.pubkey in metadata)) {
         const metadataController = new MetadataController()
 
+        const handleMetadataEvent = (event: Event) => {
+          const metadataContent =
+            metadataController.extractProfileMetadataContent(event)
+          if (metadataContent)
+            setMetadata((prev) => ({
+              ...prev,
+              [user.pubkey]: metadataContent
+            }))
+        }
+
+        metadataController.on(user.pubkey, (kind: number, event: Event) => {
+          if (kind === kinds.Metadata) {
+            handleMetadataEvent(event)
+          }
+        })
+
         metadataController
           .findMetadata(user.pubkey)
           .then((metadataEvent) => {
-            const metadataContent =
-              metadataController.extractProfileMetadataContent(metadataEvent)
-            if (metadataContent)
-              setMetadata((prev) => ({
-                ...prev,
-                [user.pubkey]: metadataContent
-              }))
+            if (metadataEvent) handleMetadataEvent(metadataEvent)
           })
           .catch((err) => {
             console.error(

src/pages/profile/index.tsx

@@ -2,7 +2,7 @@ import ContentCopyIcon from '@mui/icons-material/ContentCopy'
 import EditIcon from '@mui/icons-material/Edit'
 import { Box, IconButton, SxProps, Theme, Typography } from '@mui/material'
 import { truncate } from 'lodash'
-import { VerifiedEvent, nip19 } from 'nostr-tools'
+import { Event, VerifiedEvent, kinds, nip19 } from 'nostr-tools'
 import { useEffect, useMemo, useState } from 'react'
 import { useSelector } from 'react-redux'
 import { Link, useNavigate, useParams } from 'react-router-dom'
@@ -75,6 +75,20 @@ export const ProfilePage = () => {
 
     if (pubkey) {
       const getMetadata = async (pubkey: string) => {
+        const handleMetadataEvent = (event: Event) => {
+          const metadataContent =
+            metadataController.extractProfileMetadataContent(event)
+          if (metadataContent) {
+            setProfileMetadata(metadataContent)
+          }
+        }
+
+        metadataController.on(pubkey, (kind: number, event: Event) => {
+          if (kind === kinds.Metadata) {
+            handleMetadataEvent(event)
+          }
+        })
+
         const metadataEvent = await metadataController
           .findMetadata(pubkey)
           .catch((err) => {
@@ -82,13 +96,7 @@ export const ProfilePage = () => {
             return null
           })
 
-        if (metadataEvent) {
-          const metadataContent =
-            metadataController.extractProfileMetadataContent(metadataEvent)
-          if (metadataContent) {
-            setProfileMetadata(metadataContent)
-          }
-        }
+        if (metadataEvent) handleMetadataEvent(metadataEvent)
 
         setIsLoading(false)
       }

src/pages/settings/Settings.tsx

@@ -0,0 +1,96 @@
+import AccountCircleIcon from '@mui/icons-material/AccountCircle'
+import ArrowForwardIosIcon from '@mui/icons-material/ArrowForwardIos'
+import CachedIcon from '@mui/icons-material/Cached'
+import RouterIcon from '@mui/icons-material/Router'
+import { useTheme } from '@mui/material'
+import List from '@mui/material/List'
+import ListItemButton from '@mui/material/ListItemButton'
+import ListItemIcon from '@mui/material/ListItemIcon'
+import ListItemText from '@mui/material/ListItemText'
+import ListSubheader from '@mui/material/ListSubheader'
+import { useSelector } from 'react-redux'
+import { useNavigate } from 'react-router-dom'
+import { appPrivateRoutes, getProfileSettingsRoute } from '../../routes'
+import { State } from '../../store/rootReducer'
+
+export const SettingsPage = () => {
+  const theme = useTheme()
+
+  const navigate = useNavigate()
+  const usersPubkey = useSelector((state: State) => state.auth.usersPubkey)
+
+  const listItem = (label: string, disabled = false) => {
+    return (
+      <>
+        <ListItemText
+          primary={label}
+          sx={{
+            color: theme.palette.text.primary
+          }}
+        />
+
+        {!disabled && (
+          <ArrowForwardIosIcon
+            style={{
+              color: theme.palette.action.active,
+              marginRight: -10
+            }}
+          />
+        )}
+      </>
+    )
+  }
+
+  return (
+    <List
+      sx={{
+        width: '100%',
+        bgcolor: 'background.paper',
+        marginTop: 2
+      }}
+      subheader={
+        <ListSubheader
+          sx={{
+            fontSize: '1.5rem',
+            borderBottom: '0.5px solid',
+            paddingBottom: 2,
+            paddingTop: 2
+          }}
+        >
+          Settings
+        </ListSubheader>
+      }
+    >
+      <ListItemButton
+        onClick={() => {
+          navigate(getProfileSettingsRoute(usersPubkey!))
+        }}
+      >
+        <ListItemIcon>
+          <AccountCircleIcon />
+        </ListItemIcon>
+        {listItem('Profile')}
+      </ListItemButton>
+      <ListItemButton
+        onClick={() => {
+          navigate(appPrivateRoutes.relays)
+        }}
+      >
+        <ListItemIcon>
+          <RouterIcon />
+        </ListItemIcon>
+        {listItem('Relays')}
+      </ListItemButton>
+      <ListItemButton
+        onClick={() => {
+          navigate(appPrivateRoutes.cacheSettings)
+        }}
+      >
+        <ListItemIcon>
+          <CachedIcon />
+        </ListItemIcon>
+        {listItem('Local Cache')}
+      </ListItemButton>
+    </List>
+  )
+}

src/pages/settings/cache/index.tsx

@@ -0,0 +1,96 @@
+import ClearIcon from '@mui/icons-material/Clear'
+import InputIcon from '@mui/icons-material/Input'
+import IosShareIcon from '@mui/icons-material/IosShare'
+import {
+  List,
+  ListItemButton,
+  ListItemIcon,
+  ListItemText,
+  ListSubheader,
+  useTheme
+} from '@mui/material'
+import { useState } from 'react'
+import { toast } from 'react-toastify'
+import { localCache } from '../../../services'
+import { LoadingSpinner } from '../../../components/LoadingSpinner'
+
+export const CacheSettingsPage = () => {
+  const theme = useTheme()
+
+  const [isLoading, setIsLoading] = useState(false)
+  const [loadingSpinnerDesc, setLoadingSpinnerDesc] = useState('')
+
+  const handleClearData = async () => {
+    setIsLoading(true)
+    setLoadingSpinnerDesc('Clearing cache data')
+    localCache
+      .clearCacheData()
+      .then(() => {
+        toast.success('cleared cached data')
+      })
+      .catch((err) => {
+        console.log('An error occurred in clearing cache data', err)
+        toast.error(err.message || 'An error occurred in clearing cache data')
+      })
+      .finally(() => {
+        setIsLoading(false)
+      })
+  }
+
+  const listItem = (label: string) => {
+    return (
+      <ListItemText
+        primary={label}
+        sx={{
+          color: theme.palette.text.primary
+        }}
+      />
+    )
+  }
+
+  return (
+    <>
+      {isLoading && <LoadingSpinner desc={loadingSpinnerDesc} />}
+      <List
+        sx={{
+          width: '100%',
+          bgcolor: 'background.paper',
+          marginTop: 2
+        }}
+        subheader={
+          <ListSubheader
+            sx={{
+              fontSize: '1.5rem',
+              borderBottom: '0.5px solid',
+              paddingBottom: 2,
+              paddingTop: 2
+            }}
+          >
+            Cache Setting
+          </ListSubheader>
+        }
+      >
+        <ListItemButton disabled>
+          <ListItemIcon>
+            <IosShareIcon />
+          </ListItemIcon>
+          {listItem('Export (coming soon)')}
+        </ListItemButton>
+
+        <ListItemButton disabled>
+          <ListItemIcon>
+            <InputIcon />
+          </ListItemIcon>
+          {listItem('Import (coming soon)')}
+        </ListItemButton>
+
+        <ListItemButton onClick={handleClearData}>
+          <ListItemIcon>
+            <ClearIcon sx={{ color: theme.palette.error.main }} />
+          </ListItemIcon>
+          {listItem('Clear Cache')}
+        </ListItemButton>
+      </List>
+    </>
+  )
+}

src/pages/settings/profile/index.tsx

@@ -11,7 +11,7 @@ import {
   Typography,
   useTheme
 } from '@mui/material'
-import { UnsignedEvent, nip19, kinds, VerifiedEvent } from 'nostr-tools'
+import { UnsignedEvent, nip19, kinds, VerifiedEvent, Event } from 'nostr-tools'
 import { useEffect, useMemo, useRef, useState } from 'react'
 import { Link, useParams } from 'react-router-dom'
 import { toast } from 'react-toastify'
@@ -95,6 +95,20 @@ export const ProfileSettingsPage = () => {
 
     if (pubkey) {
       const getMetadata = async (pubkey: string) => {
+        const handleMetadataEvent = (event: Event) => {
+          const metadataContent =
+            metadataController.extractProfileMetadataContent(event)
+          if (metadataContent) {
+            setProfileMetadata(metadataContent)
+          }
+        }
+
+        metadataController.on(pubkey, (kind: number, event: Event) => {
+          if (kind === kinds.Metadata) {
+            handleMetadataEvent(event)
+          }
+        })
+
         const metadataEvent = await metadataController
           .findMetadata(pubkey)
           .catch((err) => {
@@ -102,13 +116,7 @@ export const ProfileSettingsPage = () => {
             return null
           })
 
-        if (metadataEvent) {
-          const metadataContent =
-            metadataController.extractProfileMetadataContent(metadataEvent)
-          if (metadataContent) {
-            setProfileMetadata(metadataContent)
-          }
-        }
+        if (metadataEvent) handleMetadataEvent(metadataEvent)
 
         setIsLoading(false)
       }

src/pages/settings/relays/index.tsx

@@ -1,37 +1,36 @@
-import { useEffect, useState } from 'react'
-import { Box, List, ListItem, TextField } from '@mui/material'
-import RouterIcon from '@mui/icons-material/Router'
-import styles from './style.module.scss'
-import Switch from '@mui/material/Switch'
-import ListItemText from '@mui/material/ListItemText'
-import Divider from '@mui/material/Divider'
-import { NostrController } from '../../controllers'
-import {
-  RelayMap,
-  RelayInfoObject,
-  RelayFee,
-  RelayConnectionState
-} from '../../types'
+import ContentCopyIcon from '@mui/icons-material/ContentCopy'
+import ElectricBoltIcon from '@mui/icons-material/ElectricBolt'
+import KeyboardArrowDownIcon from '@mui/icons-material/KeyboardArrowDown'
+import KeyboardArrowUpIcon from '@mui/icons-material/KeyboardArrowUp'
 import LogoutIcon from '@mui/icons-material/Logout'
-import { useAppSelector, useAppDispatch } from '../../hooks'
-import {
-  compareObjects,
-  shorten,
-  hexToNpub,
-  capitalizeFirstLetter
-} from '../../utils'
+import RouterIcon from '@mui/icons-material/Router'
+import { Box, List, ListItem, TextField, Tooltip } from '@mui/material'
+import Button from '@mui/material/Button'
+import Divider from '@mui/material/Divider'
+import InputAdornment from '@mui/material/InputAdornment'
+import ListItemText from '@mui/material/ListItemText'
+import Switch from '@mui/material/Switch'
+import { useEffect, useState } from 'react'
+import { toast } from 'react-toastify'
+import { NostrController } from '../../../controllers'
+import { useAppDispatch, useAppSelector } from '../../../hooks'
 import {
   setRelayMapAction,
   setRelayMapUpdatedAction
-} from '../../store/actions'
-import { toast } from 'react-toastify'
-import KeyboardArrowDownIcon from '@mui/icons-material/KeyboardArrowDown'
-import KeyboardArrowUpIcon from '@mui/icons-material/KeyboardArrowUp'
-import ContentCopyIcon from '@mui/icons-material/ContentCopy'
-import ElectricBoltIcon from '@mui/icons-material/ElectricBolt'
-import { Tooltip } from '@mui/material'
-import InputAdornment from '@mui/material/InputAdornment'
-import Button from '@mui/material/Button'
+} from '../../../store/actions'
+import {
+  RelayConnectionState,
+  RelayFee,
+  RelayInfoObject,
+  RelayMap
+} from '../../../types'
+import {
+  capitalizeFirstLetter,
+  compareObjects,
+  hexToNpub,
+  shorten
+} from '../../../utils'
+import styles from './style.module.scss'
 
 export const RelaysPage = () => {
   const nostrController = NostrController.getInstance()

src/pages/settings/relays/style.module.scss

@@ -1,4 +1,4 @@
-@import '../../colors.scss';
+@import '../../../colors.scss';
 
 .container {
   margin-top: 25px;

src/pages/sign/index.tsx

@@ -20,7 +20,7 @@ import saveAs from 'file-saver'
 import JSZip from 'jszip'
 import _ from 'lodash'
 import { MuiFileInput } from 'mui-file-input'
-import { Event, verifyEvent } from 'nostr-tools'
+import { Event, kinds, verifyEvent } from 'nostr-tools'
 import { useEffect, useState } from 'react'
 import { useSelector } from 'react-redux'
 import { useNavigate, useSearchParams } from 'react-router-dom'
@@ -50,7 +50,8 @@ import {
   sendDM,
   shorten,
   signEventForMetaFile,
-  uploadToFileStorage
+  uploadToFileStorage,
+  isOnline
 } from '../../utils'
 import styles from './style.module.scss'
 import {
@@ -433,7 +434,7 @@ export const SignPage = () => {
 
     const blob = new Blob([encryptedArrayBuffer])
 
-    if (navigator.onLine) {
+    if (await isOnline()) {
       setLoadingSpinnerDesc('Uploading zip file to file storage.')
       const fileUrl = await uploadToFileStorage(blob, nostrController)
         .then((url) => {
@@ -846,17 +847,27 @@ const DisplayMeta = ({
 
     hexKeys.forEach((key) => {
       if (!(key in metadata)) {
+        const handleMetadataEvent = (event: Event) => {
+          const metadataContent =
+            metadataController.extractProfileMetadataContent(event)
+
+          if (metadataContent)
+            setMetadata((prev) => ({
+              ...prev,
+              [key]: metadataContent
+            }))
+        }
+
+        metadataController.on(key, (kind: number, event: Event) => {
+          if (kind === kinds.Metadata) {
+            handleMetadataEvent(event)
+          }
+        })
+
         metadataController
           .findMetadata(key)
           .then((metadataEvent) => {
-            const metadataContent =
-              metadataController.extractProfileMetadataContent(metadataEvent)
-
-            if (metadataContent)
-              setMetadata((prev) => ({
-                ...prev,
-                [key]: metadataContent
-              }))
+            if (metadataEvent) handleMetadataEvent(metadataEvent)
           })
           .catch((err) => {
             console.error(`error occurred in finding metadata for: ${key}`, err)
@@ -902,7 +913,9 @@ const DisplayMeta = ({
             <UserComponent
               pubkey={submittedBy}
               name={
-                profile?.display_name || profile?.name || shorten(submittedBy)
+                profile?.display_name ||
+                profile?.name ||
+                shorten(hexToNpub(submittedBy))
               }
               image={profile?.picture}
             />

src/pages/verify/index.tsx

@@ -10,7 +10,7 @@ import {
 } from '@mui/material'
 import JSZip from 'jszip'
 import { MuiFileInput } from 'mui-file-input'
-import { Event, verifyEvent } from 'nostr-tools'
+import { Event, kinds, verifyEvent } from 'nostr-tools'
 import { useEffect, useState } from 'react'
 import { toast } from 'react-toastify'
 import { LoadingSpinner } from '../../components/LoadingSpinner'
@@ -107,16 +107,26 @@ export const VerifyPage = () => {
         const pubkey = npubToHex(user)!
 
         if (!(pubkey in metadata)) {
+          const handleMetadataEvent = (event: Event) => {
+            const metadataContent =
+              metadataController.extractProfileMetadataContent(event)
+            if (metadataContent)
+              setMetadata((prev) => ({
+                ...prev,
+                [pubkey]: metadataContent
+              }))
+          }
+
+          metadataController.on(pubkey, (kind: number, event: Event) => {
+            if (kind === kinds.Metadata) {
+              handleMetadataEvent(event)
+            }
+          })
+
           metadataController
             .findMetadata(pubkey)
             .then((metadataEvent) => {
-              const metadataContent =
-                metadataController.extractProfileMetadataContent(metadataEvent)
-              if (metadataContent)
-                setMetadata((prev) => ({
-                  ...prev,
-                  [pubkey]: metadataContent
-                }))
+              if (metadataEvent) handleMetadataEvent(metadataEvent)
             })
             .catch((err) => {
               console.error(

src/routes/index.tsx

@@ -1,21 +1,25 @@
-import { HomePage } from '../pages/home'
 import { CreatePage } from '../pages/create'
+import { HomePage } from '../pages/home'
 import { LandingPage } from '../pages/landing/LandingPage'
 import { Login } from '../pages/login'
 import { ProfilePage } from '../pages/profile'
-import { hexToNpub } from '../utils'
+import { SettingsPage } from '../pages/settings/Settings'
+import { CacheSettingsPage } from '../pages/settings/cache'
+import { ProfileSettingsPage } from '../pages/settings/profile'
+import { RelaysPage } from '../pages/settings/relays'
 import { SignPage } from '../pages/sign'
 import { VerifyPage } from '../pages/verify'
-import { ProfileSettingsPage } from '../pages/settings/profile'
-import { RelaysPage } from '../pages/relays'
+import { hexToNpub } from '../utils'
 
 export const appPrivateRoutes = {
   homePage: '/',
   create: '/create',
   sign: '/sign',
   verify: '/verify',
+  settings: '/settings',
   profileSettings: '/settings/profile/:npub',
-  relays: '/relays'
+  cacheSettings: '/settings/cache',
+  relays: '/settings/relays'
 }
 
 export const appPublicRoutes = {
@@ -65,10 +69,18 @@ export const privateRoutes = [
     path: appPrivateRoutes.verify,
     element: <VerifyPage />
   },
+  {
+    path: appPrivateRoutes.settings,
+    element: <SettingsPage />
+  },
   {
     path: appPrivateRoutes.profileSettings,
     element: <ProfileSettingsPage />
   },
+  {
+    path: appPrivateRoutes.cacheSettings,
+    element: <CacheSettingsPage />
+  },
   {
     path: appPrivateRoutes.relays,
     element: <RelaysPage />

src/services/cache/index.ts

@@ -0,0 +1,63 @@
+import { IDBPDatabase, openDB } from 'idb'
+import { Event } from 'nostr-tools'
+import { CachedMetadataEvent } from '../../types'
+import { SchemaV1 } from './schema'
+
+class LocalCache {
+  // Static property to hold the single instance of LocalCache
+  private static instance: LocalCache | null = null
+  private db!: IDBPDatabase<SchemaV1>
+
+  // Private constructor to prevent direct instantiation
+  private constructor() {}
+
+  // Method to initialize the database
+  private async init() {
+    this.db = await openDB<SchemaV1>('sigit-cache', 1, {
+      upgrade(db) {
+        db.createObjectStore('userMetadata', { keyPath: 'event.pubkey' })
+      }
+    })
+  }
+
+  // Static method to get the single instance of LocalCache
+  public static async getInstance(): Promise<LocalCache> {
+    // If the instance doesn't exist, create it
+    if (!LocalCache.instance) {
+      LocalCache.instance = new LocalCache()
+      await LocalCache.instance.init()
+    }
+    // Return the single instance of LocalCache
+    return LocalCache.instance
+  }
+
+  // Method to add user metadata
+  public async addUserMetadata(event: Event) {
+    await this.db.put('userMetadata', { event, cachedAt: Date.now() })
+  }
+
+  // Method to get user metadata by key
+  public async getUserMetadata(
+    key: string
+  ): Promise<CachedMetadataEvent | null> {
+    const data = await this.db.get('userMetadata', key)
+    return data || null
+  }
+
+  // Method to delete user metadata by key
+  public async deleteUserMetadata(key: string) {
+    await this.db.delete('userMetadata', key)
+  }
+
+  // Method to clear cache data
+  public async clearCacheData() {
+    // Clear the 'userMetadata' store in the IndexedDB database
+    await this.db.clear('userMetadata')
+
+    // Reload the current page to ensure any cached data is reset
+    window.location.reload()
+  }
+}
+
+// Export the single instance of LocalCache
+export const localCache = await LocalCache.getInstance()

src/services/cache/schema.ts

@@ -0,0 +1,9 @@
+import { DBSchema } from 'idb'
+import { CachedMetadataEvent } from '../../types'
+
+export interface SchemaV1 extends DBSchema {
+  userMetadata: {
+    key: string
+    value: CachedMetadataEvent
+  }
+}

src/services/index.ts

@@ -0,0 +1 @@
+export * from './cache'

src/types/cache.ts

@@ -0,0 +1,6 @@
+import { Event } from 'nostr-tools'
+
+export interface CachedMetadataEvent {
+  event: Event
+  cachedAt: number
+}

src/types/index.ts

@@ -1,5 +1,6 @@
+export * from './cache'
 export * from './core'
 export * from './nostr'
 export * from './profile'
-export * from './zip'
 export * from './relay'
+export * from './zip'

src/utils/utils.ts

@@ -11,3 +11,41 @@ export const compareObjects = (
 
   return JSON.stringify(obj1) === JSON.stringify(obj2)
 }
+
+// Function to check if the system is online by making a network request
+export const isOnline = async () => {
+  // First, check the navigator's online status
+  if (!navigator.onLine) return false // If navigator reports offline, return false
+
+  /**
+   * If navigator.onLine is true, it can be false positive.
+   * In other words, navigator.onLine being true does not necessarily mean that there is a working internet connection.
+   * Most implementations seem to only be checking if there's a connected network adapter.
+   * There are a number of circumstances where that's the case, but the internet is still unreachable. For example:
+   * The user is only connected to an internal network
+   * The user is inside a virtual machine, and the virtual network adapter is connected, but the host system is offline
+   * The user uses a VPN which has installed a virtual network adapter that is always connected
+   *
+   * To overcome the above problem we'll have to make a http request
+   */
+
+  try {
+    // Define a URL to check the online status
+    const url = 'https://www.google.com'
+
+    // Make a HEAD request to the URL with 'no-cors' mode
+    // This mode is used to handle opaque responses which do not expose their content
+    const response = await fetch(url, { method: 'HEAD', mode: 'no-cors' })
+
+    // Check if the response is OK or if the response type is 'opaque'
+    // An 'opaque' response type means that the request succeeded but the response content is not available
+    if (response.ok || response.type === 'opaque') {
+      return true // If the request is successful, return true
+    } else {
+      return false // If the request fails, return false
+    }
+  } catch (error) {
+    // Catch any errors that occur during the fetch request
+    return false // If an error occurs, return false
+  }
+}

tsconfig.json

@@ -1,8 +1,8 @@
 {
   "compilerOptions": {
-    "target": "ES2020",
+    "target": "ES2022", // Updated to ES2022 for better top-level await support
     "useDefineForClassFields": true,
-    "lib": ["ES2020", "DOM", "DOM.Iterable"],
+    "lib": ["ES2022", "DOM", "DOM.Iterable"], // Updated to ES2022
     "module": "ESNext",
     "skipLibCheck": true,
 

vite.config.ts

@@ -1,7 +1,10 @@
 import { defineConfig } from 'vite'
 import react from '@vitejs/plugin-react'
+import tsconfigPaths from 'vite-tsconfig-paths'
 
-// https://vitejs.dev/config/
 export default defineConfig({
-  plugins: [react()],
+  plugins: [react(), tsconfigPaths()],
+  build: {
+    target: 'ES2022'
+  }
 })