Adds private outbox relays to save Draft events.

quartz/src/main/java/com/vitorpamplona/quartz/events/EventFactory.kt

@@ -124,6 +124,7 @@ class EventFactory {
             PinListEvent.KIND -> PinListEvent(id, pubKey, createdAt, tags, content, sig)
             PollNoteEvent.KIND -> PollNoteEvent(id, pubKey, createdAt, tags, content, sig)
             PrivateDmEvent.KIND -> PrivateDmEvent(id, pubKey, createdAt, tags, content, sig)
+            PrivateOutboxRelayListEvent.KIND -> PrivateOutboxRelayListEvent(id, pubKey, createdAt, tags, content, sig)
             ReactionEvent.KIND -> ReactionEvent(id, pubKey, createdAt, tags, content, sig)
             RecommendRelayEvent.KIND -> RecommendRelayEvent(id, pubKey, createdAt, tags, content, sig)
             RelayAuthEvent.KIND -> RelayAuthEvent(id, pubKey, createdAt, tags, content, sig)

quartz/src/main/java/com/vitorpamplona/quartz/events/PrivateOutboxRelayListEvent.kt

@@ -0,0 +1,169 @@
+/**
+ * Copyright (c) 2024 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.quartz.events
+
+import android.util.Log
+import androidx.compose.runtime.Immutable
+import com.fasterxml.jackson.module.kotlin.readValue
+import com.vitorpamplona.quartz.encoders.ATag
+import com.vitorpamplona.quartz.encoders.HexKey
+import com.vitorpamplona.quartz.signers.NostrSigner
+import com.vitorpamplona.quartz.utils.TimeUtils
+
+@Immutable
+class PrivateOutboxRelayListEvent(
+    id: HexKey,
+    pubKey: HexKey,
+    createdAt: Long,
+    tags: Array<Array<String>>,
+    content: String,
+    sig: HexKey,
+) : BaseAddressableEvent(id, pubKey, createdAt, KIND, tags, content, sig) {
+    @Transient private var privateTagsCache: Array<Array<String>>? = null
+
+    override fun dTag() = FIXED_D_TAG
+
+    fun relays(): List<String>? {
+        return tags.mapNotNull {
+            if (it.size > 1 && it[0] == "relay") {
+                it[1]
+            } else {
+                null
+            }
+        }.plus(
+            privateTagsCache?.mapNotNull {
+                if (it.size > 1 && it[0] == "relay") {
+                    it[1]
+                } else {
+                    null
+                }
+            } ?: emptyList(),
+        ).ifEmpty { null }
+    }
+
+    fun cachedPrivateTags(): Array<Array<String>>? {
+        return privateTagsCache
+    }
+
+    fun privateTags(
+        signer: NostrSigner,
+        onReady: (Array<Array<String>>) -> Unit,
+    ) {
+        if (content.isEmpty()) {
+            onReady(emptyArray())
+            return
+        }
+
+        privateTagsCache?.let {
+            onReady(it)
+            return
+        }
+
+        try {
+            signer.nip44Decrypt(content, pubKey) {
+                privateTagsCache = mapper.readValue<Array<Array<String>>>(it)
+                privateTagsCache?.let { onReady(it) }
+            }
+        } catch (e: Throwable) {
+            Log.w("GeneralList", "Error parsing the JSON ${e.message}")
+        }
+    }
+
+    companion object {
+        const val KIND = 10013
+        const val FIXED_D_TAG = ""
+        val TAGS = arrayOf(arrayOf("alt", "Relay list to store private content from this author"))
+
+        fun createAddressATag(pubKey: HexKey): ATag {
+            return ATag(KIND, pubKey, FIXED_D_TAG, null)
+        }
+
+        fun createAddressTag(pubKey: HexKey): String {
+            return ATag.assembleATag(KIND, pubKey, FIXED_D_TAG)
+        }
+
+        fun encryptTags(
+            privateTags: Array<Array<String>>? = null,
+            signer: NostrSigner,
+            onReady: (String) -> Unit,
+        ) {
+            val msg = mapper.writeValueAsString(privateTags)
+
+            signer.nip44Encrypt(
+                msg,
+                signer.pubKey,
+                onReady,
+            )
+        }
+
+        fun createTagArray(relays: List<String>): Array<Array<String>> {
+            return relays.map {
+                arrayOf("relay", it)
+            }.toTypedArray()
+        }
+
+        fun updateRelayList(
+            earlierVersion: PrivateOutboxRelayListEvent,
+            relays: List<String>,
+            signer: NostrSigner,
+            createdAt: Long = TimeUtils.now(),
+            onReady: (PrivateOutboxRelayListEvent) -> Unit,
+        ) {
+            val tags =
+                earlierVersion.privateTagsCache?.filter { it[0] != "relay" }?.plus(
+                    relays.map {
+                        arrayOf("relay", it)
+                    },
+                )?.toTypedArray() ?: emptyArray()
+
+            encryptTags(tags, signer) {
+                signer.sign<PrivateOutboxRelayListEvent>(createdAt, KIND, TAGS, it) {
+                    it.privateTagsCache = tags
+                    onReady(it)
+                }
+            }
+        }
+
+        fun createFromScratch(
+            relays: List<String>,
+            signer: NostrSigner,
+            createdAt: Long = TimeUtils.now(),
+            onReady: (PrivateOutboxRelayListEvent) -> Unit,
+        ) {
+            create(relays, signer, createdAt, onReady)
+        }
+
+        fun create(
+            relays: List<String>,
+            signer: NostrSigner,
+            createdAt: Long = TimeUtils.now(),
+            onReady: (PrivateOutboxRelayListEvent) -> Unit,
+        ) {
+            val privateTagArray = createTagArray(relays)
+            encryptTags(privateTagArray, signer) { privateTags ->
+                signer.sign<PrivateOutboxRelayListEvent>(createdAt, KIND, TAGS, privateTags) {
+                    it.privateTagsCache = privateTagArray
+                    onReady(it)
+                }
+            }
+        }
+    }
+}