chore: add nostr service

shared/src/commonMain/kotlin/su/reya/coop/Nostr.kt

@@ -0,0 +1,28 @@
+package su.reya.coop
+
+import rust.nostr.sdk.Client
+import rust.nostr.sdk.ClientBuilder
+import rust.nostr.sdk.ClientOptions
+import rust.nostr.sdk.NostrDatabase
+import rust.nostr.sdk.NostrGossip
+import rust.nostr.sdk.RelayUrl
+
+class Nostr {
+    var client: Client? = null
+        private set
+
+    fun init(dbPath: String) {
+        val lmdb = NostrDatabase.lmdb(dbPath)
+        val gossip = NostrGossip.inMemory()
+        val opts = ClientOptions().automaticAuthentication(false)
+
+        client = ClientBuilder().database(lmdb).gossip(gossip).opts(opts).build()
+    }
+
+    suspend fun connect() {
+        this.client?.addRelay(RelayUrl.parse("wss://relay.damus.io"))
+        this.client?.addRelay(RelayUrl.parse("wss://relay.primal.net"))
+        this.client?.addRelay(RelayUrl.parse("wss://user.kindpag.es"))
+        this.client?.connect()
+    }
+}