automatically run received events through the filters they should pass (double-check the work made by the relay).

filter.js

@@ -0,0 +1,26 @@
+export function matchFilter(filter, event) {
+  if (filter.id && event.id !== filter.id) return false
+  if (filter.kind && event.kind !== filter.kind) return false
+  if (filter.author && event.pubkey !== filter.author) return false
+  if (filter.authors && filter.author.indexOf(event.pubkey) === -1) return false
+  if (
+    filter['#e'] &&
+    event.tags.find(([t, v]) => t === 'e' && v === filter['#e']) === null
+  )
+    return false
+  if (
+    filter['#p'] &&
+    event.tags.find(([t, v]) => t === 'p' && v === filter['#p']) === null
+  )
+    return false
+  if (filter.since && event.created_at <= filter.since) return false
+
+  return true
+}
+
+export function matchFilters(filters, event) {
+  for (let i = 0; i < filters.length; i++) {
+    if (matchFilter(filters[i], event)) return true
+  }
+  return false
+}

index.js

@@ -7,6 +7,7 @@ import {
   serializeEvent,
   getEventHash
 } from './event'
+import {matchFilter, matchFilters} from './filter'
 import {makeRandom32, sha256, getPublicKey} from './utils'
 
 export {
@@ -19,5 +20,7 @@ export {
   makeRandom32,
   sha256,
   getPublicKey,
-  getBlankEvent
+  getBlankEvent,
+  matchFilter,
+  matchFilters
 }

package.json

@@ -1,6 +1,6 @@
 {
   "name": "nostr-tools",
-  "version": "0.9.1",
+  "version": "0.10.1",
   "description": "Tools for making a Nostr client.",
   "repository": {
     "type": "git",

relay.js

@@ -1,6 +1,7 @@
 import 'websocket-polyfill'
 
 import {verifySignature} from './event'
+import {matchFilters} from './filter'
 
 export function normalizeRelayURL(url) {
   let [host, ...qs] = url.split('?')
@@ -88,10 +89,12 @@ export function relayConnect(url, onNotice) {
           let channel = data[1]
           let event = data[2]
 
-          if (await verifySignature(event)) {
-            if (channels[channel]) {
-              channels[channel](event)
-            }
+          if (
+            (await verifySignature(event)) &&
+            channels[channel] &&
+            matchFilters(openSubs[channel], event)
+          ) {
+            channels[channel](event)
           }
           return
         }