src/components/AppBar/AppBar.tsx

@@ -17,7 +17,11 @@ import Username from '../username'
 
 import { Link, useNavigate } from 'react-router-dom'
 import { MetadataController, NostrController } from '../../controllers'
-import { appPublicRoutes, getProfileRoute } from '../../routes'
+import {
+  appPublicRoutes,
+  appPrivateRoutes,
+  getProfileRoute
+} from '../../routes'
 import {
   clearAuthToken,
   clearState,
@@ -160,6 +164,16 @@ export const AppBar = () => {
                 >
                   Profile
                 </MenuItem>
+                <MenuItem
+                  onClick={() => {
+                    navigate(appPrivateRoutes.relays)
+                  }}
+                  sx={{
+                    justifyContent: 'center'
+                  }}
+                >
+                  Relays
+                </MenuItem>
                 <Link
                   to={appPublicRoutes.help}
                   target="_blank"

src/controllers/AuthController.ts

@@ -1,13 +1,18 @@
 import { EventTemplate } from 'nostr-tools'
 import { MetadataController, NostrController } from '.'
-import { setAuthState, setMetadataEvent } from '../store/actions'
+import {
+  setAuthState,
+  setMetadataEvent,
+  setRelayMapAction
+} from '../store/actions'
 import store from '../store/store'
 import {
   base64DecodeAuthToken,
   base64EncodeSignedEvent,
   getAuthToken,
   getVisitedLink,
-  saveAuthToken
+  saveAuthToken,
+  compareObjects
 } from '../utils'
 import { appPrivateRoutes } from '../routes'
 import { SignedEvent } from '../types'
@@ -30,7 +35,7 @@ export class AuthController {
    * @returns url to redirect if authentication successfull
    * or error if otherwise
    */
-  async authenticateAndFindMetadata(pubkey: string) {
+  async authAndGetMetadataAndRelaysMap(pubkey: string) {
     const emptyMetadata = this.metadataController.getEmptyMetadataEvent()
 
     this.metadataController
@@ -69,6 +74,27 @@ export class AuthController {
       })
     )
 
+    const relaysState = store.getState().relays
+
+    if (relaysState) {
+      // Relays state is defined and there is no need to await for the latest relay map
+      this.nostrController.getRelayMap(pubkey).then((relayMap) => {
+        if (!compareObjects(relaysState?.map, relayMap)) {
+          store.dispatch(setRelayMapAction(relayMap.map))
+        }
+      })
+    } else {
+      // Relays state is not defined, await for the latest relay map
+      const relayMap = await this.nostrController.getRelayMap(pubkey)
+
+      if (Object.keys(relayMap).length < 1) {
+        // Navigate user to relays page
+        return Promise.resolve(appPrivateRoutes.relays)
+      }
+
+      store.dispatch(setRelayMapAction(relayMap.map))
+    }
+
     const visitedLink = getVisitedLink()
 
     if (visitedLink) {

src/controllers/NostrController.ts

@@ -10,19 +10,22 @@ import {
   EventTemplate,
   SimplePool,
   UnsignedEvent,
+  Filter,
   finalizeEvent,
   nip04,
-  nip19
+  nip19,
+  kinds
 } from 'nostr-tools'
 import { EventEmitter } from 'tseep'
 import { updateNsecbunkerPubkey } from '../store/actions'
 import { AuthState, LoginMethods } from '../store/auth/types'
 import store from '../store/store'
-import { SignedEvent } from '../types'
+import { SignedEvent, RelayMap } from '../types'
 import { getNsecBunkerDelegatedKey, verifySignedEvent } from '../utils'
 
 export class NostrController extends EventEmitter {
   private static instance: NostrController
+  private specialMetadataRelay = 'wss://purplepag.es'
 
   private bunkerNDK: NDK | undefined
   private remoteSigner: NDKNip46Signer | undefined
@@ -216,12 +219,16 @@ export class NostrController extends EventEmitter {
 
     if (publishedRelays.length === 0) {
       const failedPublishes: any[] = []
+      const fallbackRejectionReason =
+        'Attempt to publish an event has been rejected with unknown reason.'
 
       results.forEach((res, index) => {
         if (res.status === 'rejected') {
           failedPublishes.push({
             relay: relays[index],
-            error: res.reason.message
+            error: res.reason
+              ? res.reason.message || fallbackRejectionReason
+              : fallbackRejectionReason
           })
         }
       })
@@ -374,4 +381,108 @@ export class NostrController extends EventEmitter {
   generateDelegatedKey = (): string => {
     return NDKPrivateKeySigner.generate().privateKey!
   }
+
+  /**
+   * Provides relay map.
+   * @param npub - user's npub
+   * @returns - promise that resolves into relay map and a timestamp when it has been updated.
+   */
+  getRelayMap = async (
+    npub: string
+  ): Promise<{ map: RelayMap; mapUpdated: number }> => {
+    const mostPopularRelays = import.meta.env.VITE_MOST_POPULAR_RELAYS
+    const hardcodedPopularRelays = (mostPopularRelays || '').split(' ')
+    const popularRelayURIs = [
+      this.specialMetadataRelay,
+      ...hardcodedPopularRelays
+    ]
+
+    const pool = new SimplePool()
+
+    // More info about this kind of event available https://github.com/nostr-protocol/nips/blob/master/65.md
+    const eventFilter: Filter = {
+      kinds: [kinds.RelayList],
+      authors: [npub]
+    }
+
+    const event = await pool.get(popularRelayURIs, eventFilter).catch((err) => {
+      return Promise.reject(err)
+    })
+
+    if (event) {
+      // Handle founded 10002 event
+      const relaysMap: RelayMap = {}
+
+      // 'r' stands for 'relay'
+      const relayTags = event.tags.filter((tag) => tag[0] === 'r')
+
+      relayTags.forEach((tag) => {
+        const uri = tag[1]
+        const relayType = tag[2]
+
+        // if 3rd element of relay tag is undefined, relay is WRITE and READ
+        relaysMap[uri] = {
+          write: relayType ? relayType === 'write' : true,
+          read: relayType ? relayType === 'read' : true
+        }
+      })
+
+      return Promise.resolve({ map: relaysMap, mapUpdated: event.created_at })
+    } else {
+      return Promise.reject('User relays were not found.')
+    }
+  }
+
+  /**
+   * Publishes relay map.
+   * @param relayMap - relay map.
+   * @param npub - user's npub.
+   * @returns - promise that resolves into a string representing publishing result.
+   */
+  publishRelayMap = async (
+    relayMap: RelayMap,
+    npub: string
+  ): Promise<string> => {
+    const timestamp = Math.floor(Date.now() / 1000)
+    const relayURIs = Object.keys(relayMap)
+
+    // More info about this kind of event available https://github.com/nostr-protocol/nips/blob/master/65.md
+    const tags: string[][] = relayURIs.map((relayURI) =>
+      [
+        'r',
+        relayURI,
+        relayMap[relayURI].read && relayMap[relayURI].write
+          ? ''
+          : relayMap[relayURI].write
+            ? 'write'
+            : 'read'
+      ].filter((value) => value !== '')
+    )
+
+    const newRelayMapEvent: UnsignedEvent = {
+      kind: kinds.RelayList,
+      tags,
+      content: '',
+      pubkey: npub,
+      created_at: timestamp
+    }
+
+    const signedEvent = await this.signEvent(newRelayMapEvent)
+
+    let relaysToPublish = relayURIs
+
+    // If relay map is empty, use most popular relay URIs
+    if (!relaysToPublish.length) {
+      const mostPopularRelays = import.meta.env.VITE_MOST_POPULAR_RELAYS
+      const hardcodedPopularRelays = (mostPopularRelays || '').split(' ')
+
+      relaysToPublish = [this.specialMetadataRelay, ...hardcodedPopularRelays]
+    }
+
+    await this.publishEvent(signedEvent, relaysToPublish)
+
+    return Promise.resolve(
+      `Relay Map published on: ${relaysToPublish.join('\n')}`
+    )
+  }
 }

src/hooks/index.ts

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

src/hooks/store.ts

@@ -0,0 +1,6 @@
+import { useDispatch, useSelector } from 'react-redux'
+import type { Dispatch, RootState } from '../store/store'
+
+// Use instead of plain `useDispatch` and `useSelector`
+export const useAppDispatch = useDispatch.withTypes<Dispatch>()
+export const useAppSelector = useSelector.withTypes<RootState>()

src/main.tsx

@@ -15,7 +15,8 @@ store.subscribe(
     saveState({
       auth: store.getState().auth,
       metadata: store.getState().metadata,
-      userRobotImage: store.getState().userRobotImage
+      userRobotImage: store.getState().userRobotImage,
+      relays: store.getState().relays
     })
   }, 1000)
 )

src/pages/login/index.tsx

@@ -79,7 +79,7 @@ export const Login = () => {
 
         setLoadingSpinnerDesc('Authenticating and finding metadata')
         const redirectPath =
-          await authController.authenticateAndFindMetadata(pubkey)
+          await authController.authAndGetMetadataAndRelaysMap(pubkey)
 
         navigateAfterLogin(redirectPath)
       })
@@ -118,7 +118,7 @@ export const Login = () => {
     setLoadingSpinnerDesc('Authenticating and finding metadata')
 
     const redirectPath = await authController
-      .authenticateAndFindMetadata(publickey)
+      .authAndGetMetadataAndRelaysMap(publickey)
       .catch((err) => {
         toast.error('Error occurred in authentication: ' + err)
         return null
@@ -213,7 +213,7 @@ export const Login = () => {
         setLoadingSpinnerDesc('Authenticating and finding metadata')
 
         const redirectPath = await authController
-          .authenticateAndFindMetadata(pubkey!)
+          .authAndGetMetadataAndRelaysMap(pubkey!)
           .catch((err) => {
             toast.error('Error occurred in authentication: ' + err)
             return null
@@ -273,7 +273,7 @@ export const Login = () => {
         setLoadingSpinnerDesc('Authenticating and finding metadata')
 
         const redirectPath = await authController
-          .authenticateAndFindMetadata(pubkey!)
+          .authAndGetMetadataAndRelaysMap(pubkey!)
           .catch((err) => {
             toast.error('Error occurred in authentication: ' + err)
             return null

src/pages/relays/index.tsx

@@ -0,0 +1,234 @@
+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 } from '../../types'
+import LogoutIcon from '@mui/icons-material/Logout'
+import { useAppSelector, useAppDispatch } from '../../hooks'
+import { compareObjects } from '../../utils'
+import { setRelayMapAction } from '../../store/actions'
+import { toast } from 'react-toastify'
+
+export const RelaysPage = () => {
+  const nostrController = NostrController.getInstance()
+
+  const relaysState = useAppSelector((state) => state.relays)
+  const usersPubkey = useAppSelector((state) => state.auth?.usersPubkey)
+
+  const dispatch = useAppDispatch()
+
+  const [newRelayURI, setNewRelayURI] = useState<string>()
+  const [newRelayURIerror, setNewRelayURIerror] = useState<string>()
+  const [relayMap, setRelayMap] = useState<RelayMap | undefined>(
+    relaysState?.map
+  )
+
+  useEffect(() => {
+    let isMounted = false
+
+    const fetchData = async () => {
+      if (usersPubkey) {
+        isMounted = true
+
+        // call async func to fetch relay map
+        const newRelayMap = await nostrController.getRelayMap(usersPubkey)
+
+        // handle fetched relay map
+        if (isMounted) {
+          if (
+            !relaysState?.mapUpdated ||
+            newRelayMap.mapUpdated > relaysState?.mapUpdated
+          )
+            if (
+              !relaysState?.map ||
+              !compareObjects(relaysState.map, newRelayMap)
+            ) {
+              setRelayMap(newRelayMap.map)
+
+              dispatch(setRelayMapAction(newRelayMap.map))
+            }
+        }
+      }
+    }
+
+    // Publishing relay map can take some time.
+    // This is why data fetch should happen only if relay map was received more than 5 minutes ago.
+    if (
+      usersPubkey &&
+      (!relaysState?.mapUpdated ||
+        Date.now() - relaysState?.mapUpdated > 5 * 60 * 1000) // 5 minutes
+    ) {
+      fetchData()
+    }
+
+    // cleanup func
+    return () => {
+      isMounted = false
+    }
+  }, [dispatch, usersPubkey, relaysState, nostrController])
+
+  useEffect(() => {
+    // Display notification if an empty relay map has been received
+    if (relayMap && Object.keys(relayMap).length === 0) {
+      relayRequirementWarning()
+    }
+  }, [relayMap])
+
+  const relayRequirementWarning = () =>
+    toast.warning('At least one write relay is needed for SIGit to work.')
+
+  const handleLeaveRelay = async (relay: string) => {
+    if (relayMap) {
+      if (Object.keys(relayMap).length === 1) {
+        relayRequirementWarning()
+      } else {
+        const relayMapCopy = JSON.parse(JSON.stringify(relayMap))
+        // Remove relay from relay map
+        delete relayMapCopy[relay]
+
+        setRelayMap(relayMapCopy)
+
+        dispatch(setRelayMapAction(relayMapCopy))
+
+        if (usersPubkey) {
+          // Publish updated relay map.
+          const relayMapPublishingRes = await nostrController
+            .publishRelayMap(relayMapCopy, usersPubkey)
+            .catch((err) => handlePublishRelayMapError(err))
+
+          if (relayMapPublishingRes) toast.success(relayMapPublishingRes)
+        }
+      }
+    }
+  }
+
+  const handlePublishRelayMapError = (err: any) => {
+    const errorPrefix = 'Error while publishing Relay Map'
+
+    if (Array.isArray(err)) {
+      err.forEach((errorObj: { relay: string; error: string }) => {
+        toast.error(
+          `${errorPrefix} to ${errorObj.relay}. Error: ${errorObj.error || 'Unknown'}`
+        )
+      })
+    } else {
+      toast.error(`${errorPrefix}. Error: ${err.message || 'Unknown'}`)
+    }
+  }
+
+  const handleRelayWriteChange = async (
+    relay: string,
+    event: React.ChangeEvent<HTMLInputElement>
+  ) => {
+    if (relayMap && relayMap[relay]) {
+      if (
+        !event.target.checked &&
+        Object.keys(relayMap).filter((relay) => relayMap[relay].write)
+          .length === 1
+      ) {
+        relayRequirementWarning()
+      } else {
+        const relayMapCopy = JSON.parse(JSON.stringify(relayMap))
+        relayMapCopy[relay].write = event.target.checked
+
+        setRelayMap(relayMapCopy)
+
+        dispatch(setRelayMapAction(relayMapCopy))
+
+        if (usersPubkey) {
+          // Publish updated relay map
+          const relayMapPublishingRes = await nostrController
+            .publishRelayMap(relayMapCopy, usersPubkey)
+            .catch((err) => handlePublishRelayMapError(err))
+
+          if (relayMapPublishingRes) toast.success(relayMapPublishingRes)
+        }
+      }
+    }
+  }
+
+  const handleTextFieldChange = async () => {
+    // Check if new relay URI is a valid string
+    if (
+      newRelayURI &&
+      !/^wss:\/\/[-a-zA-Z0-9@:%._\\+~#=]{1,256}\.[a-zA-Z0-9()]{1,6}/.test(
+        newRelayURI
+      )
+    ) {
+      setNewRelayURIerror(
+        'New relay URI is not valid. Example of valid relay URI: wss://sigit.relay.io'
+      )
+    } else if (newRelayURI) {
+      const relayMapCopy = JSON.parse(JSON.stringify(relayMap))
+
+      relayMapCopy[newRelayURI.trim()] = { write: true, read: true }
+
+      setRelayMap(relayMapCopy)
+      setNewRelayURI('')
+
+      dispatch(setRelayMapAction(relayMapCopy))
+
+      if (usersPubkey) {
+        // Publish updated relay map
+        const relayMapPublishingRes = await nostrController
+          .publishRelayMap(relayMapCopy, usersPubkey)
+          .catch((err) => handlePublishRelayMapError(err))
+
+        if (relayMapPublishingRes) toast.success(relayMapPublishingRes)
+      }
+    }
+  }
+
+  return (
+    <Box className={styles.container}>
+      <Box>
+        <TextField
+          label="Add new relay"
+          value={newRelayURI}
+          onBlur={() => handleTextFieldChange()}
+          onChange={(e) => setNewRelayURI(e.target.value)}
+          helperText={newRelayURIerror}
+          error={!!newRelayURIerror}
+          placeholder="wss://"
+          className={styles.relayURItextfield}
+        />
+      </Box>
+      <Box className={styles.sectionTitle}>
+        <RouterIcon className={styles.sectionIcon} />
+        <span>YOUR RELAYS</span>
+      </Box>
+      {relayMap && (
+        <Box className={styles.relaysContainer}>
+          {Object.keys(relayMap).map((relay, i) => (
+            <Box className={styles.relay} key={`relay_${i}`}>
+              <List>
+                <ListItem>
+                  <ListItemText primary={relay} />
+                  <Box
+                    className={styles.leaveRelayContainer}
+                    onClick={() => handleLeaveRelay(relay)}
+                  >
+                    <LogoutIcon />
+                    <span>Leave</span>
+                  </Box>
+                </ListItem>
+                <Divider className={styles.relayDivider} />
+                <ListItem>
+                  <ListItemText primary="Publish to this relay?" />
+                  <Switch
+                    checked={relayMap[relay].write}
+                    onChange={(event) => handleRelayWriteChange(relay, event)}
+                  />
+                </ListItem>
+              </List>
+            </Box>
+          ))}
+        </Box>
+      )}
+    </Box>
+  )
+}

src/pages/relays/style.module.scss

@@ -0,0 +1,47 @@
+@import '../../colors.scss';
+
+.container {
+  margin-top: 25px;
+
+  .relayURItextfield {
+    width: 100%;
+  }
+
+  .sectionIcon {
+    font-size: 30px;
+  }
+
+  .sectionTitle {
+    margin-top: 35px;
+    margin-bottom: 10px;
+    display: flex;
+    flex-direction: row;
+    gap: 5px;
+    font-size: 1.5rem;
+    line-height: 2rem;
+    font-weight: 600;
+  }
+
+  .relaysContainer {
+    display: flex;
+    flex-direction: column;
+    gap: 15px;
+  }
+
+  .relay {
+    border: 1px solid rgba(0, 0, 0, 0.12);
+    border-radius: 4px;
+
+    .relayDivider {
+      margin-left: 10px;
+      margin-right: 10px;
+    }
+
+    .leaveRelayContainer {
+      display: flex;
+      flex-direction: row;
+      gap: 10px;
+      cursor: pointer;
+    }
+  }
+}

src/routes/index.tsx

@@ -6,12 +6,14 @@ import { ProfilePage } from '../pages/profile'
 import { hexToNpub } from '../utils'
 import { SignPage } from '../pages/sign'
 import { VerifyPage } from '../pages/verify'
+import { RelaysPage } from '../pages/relays'
 
 export const appPrivateRoutes = {
   homePage: '/',
   create: '/create',
   sign: '/sign',
-  verify: '/verify'
+  verify: '/verify',
+  relays: '/relays'
 }
 
 export const appPublicRoutes = {
@@ -57,5 +59,9 @@ export const privateRoutes = [
   {
     path: appPrivateRoutes.verify,
     element: <VerifyPage />
+  },
+  {
+    path: appPrivateRoutes.relays,
+    element: <RelaysPage />
   }
 ]

src/store/actionTypes.ts

@@ -9,3 +9,5 @@ export const UPDATE_NSECBUNKER_RELAYS = 'UPDATE_NSECBUNKER_RELAYS'
 export const SET_METADATA_EVENT = 'SET_METADATA_EVENT'
 
 export const SET_USER_ROBOT_IMAGE = 'SET_USER_ROBOT_IMAGE'
+
+export const SET_RELAY_MAP = 'SET_RELAY_MAP'

src/store/actions.ts

@@ -3,6 +3,7 @@ import { State } from './rootReducer'
 
 export * from './auth/action'
 export * from './metadata/action'
+export * from './relays/action'
 
 export const restoreState = (payload: State) => {
   return {

src/store/relays/action.ts

@@ -0,0 +1,8 @@
+import * as ActionTypes from '../actionTypes'
+import { SetRelayMapAction } from './types'
+import { RelayMap } from '../../types'
+
+export const setRelayMapAction = (payload: RelayMap): SetRelayMapAction => ({
+  type: ActionTypes.SET_RELAY_MAP,
+  payload
+})

src/store/relays/reducer.ts

@@ -0,0 +1,22 @@
+import * as ActionTypes from '../actionTypes'
+import { RelaysDispatchTypes, RelaysState } from './types'
+
+const initialState: RelaysState | null = null
+
+const reducer = (
+  state = initialState,
+  action: RelaysDispatchTypes
+): RelaysState | null => {
+  switch (action.type) {
+    case ActionTypes.SET_RELAY_MAP:
+      return { map: action.payload, mapUpdated: Date.now() }
+
+    case ActionTypes.RESTORE_STATE:
+      return action.payload.relays
+
+    default:
+      return state
+  }
+}
+
+export default reducer

src/store/relays/types.ts

@@ -0,0 +1,12 @@
+import * as ActionTypes from '../actionTypes'
+import { RestoreState } from '../actions'
+import { RelayMap } from '../../types'
+
+export type RelaysState = { map: RelayMap; mapUpdated: number }
+
+export interface SetRelayMapAction {
+  type: typeof ActionTypes.SET_RELAY_MAP
+  payload: RelayMap
+}
+
+export type RelaysDispatchTypes = SetRelayMapAction | RestoreState

src/store/rootReducer.ts

@@ -4,15 +4,19 @@ import authReducer from './auth/reducer'
 import { AuthState } from './auth/types'
 import metadataReducer from './metadata/reducer'
 import userRobotImageReducer from './userRobotImage/reducer'
+import { RelaysState } from './relays/types'
+import relaysReducer from './relays/reducer'
 
 export interface State {
   auth: AuthState
   metadata?: Event
   userRobotImage?: string
+  relays: RelaysState
 }
 
 export default combineReducers({
   auth: authReducer,
   metadata: metadataReducer,
-  userRobotImage: userRobotImageReducer
+  userRobotImage: userRobotImageReducer,
+  relays: relaysReducer
 })

src/store/store.ts

@@ -1,8 +1,11 @@
 import { configureStore } from '@reduxjs/toolkit'
 import rootReducer from './rootReducer'
 
-const store = configureStore({ reducer: rootReducer })
+const store = configureStore({
+  reducer: rootReducer
+})
 
 export default store
 
 export type Dispatch = typeof store.dispatch
+export type RootState = ReturnType<typeof store.getState>

src/types/nostr.ts

@@ -17,3 +17,10 @@ export interface NostrJoiningBlock {
   block: number
   encodedEventPointer: string
 }
+
+export type RelayMap = {
+  [key: string]: {
+    read: boolean
+    write: boolean
+  }
+}

src/utils/index.ts

@@ -5,3 +5,4 @@ export * from './misc'
 export * from './nostr'
 export * from './string'
 export * from './zip'
+export * from './utils'

src/utils/utils.ts

@@ -0,0 +1,13 @@
+export const compareObjects = (
+  obj1: object | null | undefined,
+  obj2: object | null | undefined
+): boolean => {
+  if (Array.isArray(obj1) && Array.isArray(obj2)) {
+    const obj1Copy = [...obj1].sort()
+    const obj2Copy = [...obj2].sort()
+
+    return JSON.stringify(obj1Copy) === JSON.stringify(obj2Copy)
+  }
+
+  return JSON.stringify(obj1) === JSON.stringify(obj2)
+}