Refactors GiftWrap caching to delete encrypted text and reload the wrap if necessary.

- Changes host to a host stub to reduce memory use
- Only download GiftWraps form 2 days past the last EOSE

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

@@ -526,9 +526,15 @@ open class WrappedEvent(
     content: String,
     sig: HexKey,
 ) : Event(id, pubKey, createdAt, kind, tags, content, sig) {
-    @Transient var host: Event? = null // host event to broadcast when needed
+    @Transient var host: HostStub? = null // host event to broadcast when needed
 }
 
+class HostStub(
+    val id: HexKey,
+    val pubKey: HexKey,
+    val kind: Int,
+)
+
 @Immutable
 interface AddressableEvent {
     fun dTag(): String

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

@@ -38,6 +38,22 @@ class GiftWrapEvent(
 ) : Event(id, pubKey, createdAt, KIND, tags, content, sig) {
     @Transient private var cachedInnerEvent: Map<HexKey, Event?> = mapOf()
 
+    fun copyNoContent(): GiftWrapEvent {
+        val copy =
+            GiftWrapEvent(
+                id,
+                pubKey,
+                createdAt,
+                tags,
+                "",
+                sig,
+            )
+
+        copy.cachedInnerEvent = cachedInnerEvent
+
+        return copy
+    }
+
     override fun isContentEncoded() = true
 
     fun preCachedGift(signer: NostrSigner): Event? {
@@ -61,7 +77,7 @@ class GiftWrapEvent(
         }
         unwrap(signer) { gift ->
             if (gift is WrappedEvent) {
-                gift.host = this
+                gift.host = HostStub(this.id, this.pubKey, this.kind)
             }
             addToCache(signer.pubKey, gift)
 

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

@@ -39,6 +39,23 @@ class SealedGossipEvent(
 ) : WrappedEvent(id, pubKey, createdAt, KIND, tags, content, sig) {
     @Transient private var cachedInnerEvent: Map<HexKey, Event?> = mapOf()
 
+    fun copyNoContent(): SealedGossipEvent {
+        val copy =
+            SealedGossipEvent(
+                id,
+                pubKey,
+                createdAt,
+                tags,
+                "",
+                sig,
+            )
+
+        copy.cachedInnerEvent = cachedInnerEvent
+        copy.host = host
+
+        return copy
+    }
+
     override fun isContentEncoded() = true
 
     fun preCachedGossip(signer: NostrSigner): Event? {
@@ -64,7 +81,7 @@ class SealedGossipEvent(
         unseal(signer) { gossip ->
             val event = gossip.mergeWith(this)
             if (event is WrappedEvent) {
-                event.host = host ?: this
+                event.host = host ?: HostStub(this.id, this.pubKey, this.kind)
             }
             addToCache(signer.pubKey, event)
 

quartz/src/main/java/com/vitorpamplona/quartz/utils/TimeUtils.kt

@@ -51,6 +51,8 @@ object TimeUtils {
 
     fun eightHoursAgo() = now() - EIGHT_HOURS
 
+    fun twoDays() = ONE_DAY * 2
+
     fun oneWeekAgo() = now() - ONE_WEEK
 
     fun randomWithinAWeek() = System.currentTimeMillis() / 1000 - CryptoUtils.randomInt(ONE_WEEK)