add support for private zaps

app/src/main/java/com/vitorpamplona/amethyst/model/Account.kt

@@ -461,6 +461,21 @@ class Account(
                             AmberUtils.content
                         )
                     }
+
+                    LnZapEvent.ZapType.PRIVATE -> {
+                        val unsignedEvent = LnZapRequestEvent.createPrivateZap(
+                            event,
+                            userProfile().latestContactList?.relays()?.keys?.ifEmpty { null }
+                                ?: localRelays.map { it.url }.toSet(),
+                            keyPair.pubKey.toHexKey(),
+                            pollOption,
+                            message
+                        )
+                        AmberUtils.content = ""
+                        AmberUtils.openAmber(unsignedEvent)
+                        if (AmberUtils.content.isBlank()) return null
+                        return Event.fromJson(AmberUtils.content) as LnZapRequestEvent
+                    }
                     else -> null
                 }
             } else {
@@ -485,21 +500,30 @@ class Account(
     fun isNIP47Author(pubkeyHex: String?): Boolean {
         val privKey = zapPaymentRequest?.secret?.hexToByteArray() ?: keyPair.privKey
 
-        if (privKey == null) return false
+        if (privKey == null && !loginWithAmber) return false
 
+        if (privKey != null) {
             val pubKey = CryptoUtils.pubkeyCreate(privKey).toHexKey()
             return (pubKey == pubkeyHex)
         }
 
+        return (keyPair.pubKey.toHexKey() == pubkeyHex)
+    }
+
     fun decryptZapPaymentResponseEvent(zapResponseEvent: LnZapPaymentResponseEvent): Response? {
         val myNip47 = zapPaymentRequest ?: return null
 
         val privKey = myNip47.secret?.hexToByteArray() ?: keyPair.privKey
         val pubKey = myNip47.pubKeyHex.hexToByteArray()
 
-        if (privKey == null) return null
+        if (privKey == null && !loginWithAmber) return null
 
-        return zapResponseEvent.response(privKey, pubKey)
+        if (privKey != null) return zapResponseEvent.response(privKey, pubKey)
+
+        Log.d("zaps", "decrypt with amber")
+        AmberUtils.decrypt(zapResponseEvent.content, pubKey.toHexKey(), zapResponseEvent.id)
+        if (AmberUtils.content.isBlank()) return null
+        return zapResponseEvent.response(AmberUtils.content)
     }
 
     fun calculateIfNoteWasZappedByAccount(zappedNote: Note?): Boolean {
@@ -2546,12 +2570,21 @@ class Account(
         if (loginWithAmber && event is LnZapRequestEvent && event.isPrivateZap()) {
             val decryptedContent = AmberUtils.cachedDecryptedContent[event.id]
             if (decryptedContent != null) {
-                return Event.fromJson(decryptedContent)
+                return try {
+                    Event.fromJson(decryptedContent)
+                } catch (e: Exception) {
+                    null
+                }
             }
             AmberUtils.decryptZapEvent(event)
             if (AmberUtils.content.isBlank()) return null
+            if (AmberUtils.content == "Could not decrypt the message") return null
             AmberUtils.cachedDecryptedContent[event.id] = AmberUtils.content
-            return Event.fromJson(AmberUtils.content)
+            return try {
+                Event.fromJson(AmberUtils.content)
+            } catch (e: Exception) {
+                null
+            }
         }
 
         return if (event is LnZapRequestEvent && loggedInPrivateKey != null && event.isPrivateZap()) {

app/src/main/java/com/vitorpamplona/amethyst/service/AmberUtils.kt

@@ -105,7 +105,6 @@ object AmberUtils {
     }
 
     fun decryptZapEvent(event: LnZapRequestEvent) {
-        if (content.isBlank()) {
         isActivityRunning = true
         openAmber(
             event.toJson(),
@@ -119,4 +118,3 @@ object AmberUtils {
         }
     }
 }
-}

app/src/main/java/com/vitorpamplona/amethyst/service/notifications/EventNotificationConsumer.kt

@@ -34,14 +34,43 @@ class EventNotificationConsumer(private val applicationContext: Context) {
         // Test with all logged in accounts
         LocalPreferences.allSavedAccounts().forEach {
             val acc = LocalPreferences.loadFromEncryptedStorage(it.npub)
-            if (acc != null && acc.keyPair.privKey != null) {
+            if (acc != null && (acc.keyPair.privKey != null || acc.loginWithAmber)) {
                 consumeIfMatchesAccount(event, acc)
             }
         }
     }
 
     private suspend fun consumeIfMatchesAccount(pushWrappedEvent: GiftWrapEvent, account: Account) {
-        val key = account.keyPair.privKey ?: return
+        val key = account.keyPair.privKey
+        if (account.loginWithAmber) {
+            var cached = AmberUtils.cachedDecryptedContent[pushWrappedEvent.id]
+            if (cached == null) {
+                AmberUtils.content = ""
+                AmberUtils.decrypt(
+                    pushWrappedEvent.content,
+                    pushWrappedEvent.pubKey,
+                    pushWrappedEvent.id,
+                    SignerType.NIP44_DECRYPT
+                )
+                cached = AmberUtils.cachedDecryptedContent[pushWrappedEvent.id] ?: ""
+            }
+            pushWrappedEvent.unwrap(cached)?.let { notificationEvent ->
+                if (!LocalCache.justVerify(notificationEvent)) return // invalid event
+                if (LocalCache.notes[notificationEvent.id] != null) return // already processed
+
+                LocalCache.justConsume(notificationEvent, null)
+
+                unwrapAndConsume(notificationEvent, account)?.let { innerEvent ->
+                    if (innerEvent is PrivateDmEvent) {
+                        notify(innerEvent, account)
+                    } else if (innerEvent is LnZapEvent) {
+                        notify(innerEvent, account)
+                    } else if (innerEvent is ChatMessageEvent) {
+                        notify(innerEvent, account)
+                    }
+                }
+            }
+        } else if (key != null) {
             pushWrappedEvent.unwrap(key)?.let { notificationEvent ->
                 if (!LocalCache.justVerify(notificationEvent)) return // invalid event
                 if (LocalCache.notes[notificationEvent.id] != null) return // already processed
@@ -59,6 +88,7 @@ class EventNotificationConsumer(private val applicationContext: Context) {
                 }
             }
         }
+    }
 
     private fun unwrapAndConsume(event: Event, account: Account): Event? {
         if (!LocalCache.justVerify(event)) return null
@@ -71,6 +101,8 @@ class EventNotificationConsumer(private val applicationContext: Context) {
                         unwrapAndConsume(it, account)
                     }
                 } else if (account.loginWithAmber) {
+                    var cached = AmberUtils.cachedDecryptedContent[event.id]
+                    if (cached == null) {
                         AmberUtils.content = ""
                         AmberUtils.decrypt(
                             event.content,
@@ -78,9 +110,11 @@ class EventNotificationConsumer(private val applicationContext: Context) {
                             event.id,
                             SignerType.NIP44_DECRYPT
                         )
-                    val decryptedContent = AmberUtils.cachedDecryptedContent[event.id] ?: ""
+                        cached = AmberUtils.cachedDecryptedContent[event.id] ?: ""
-                    if (decryptedContent.isNotBlank()) {
+                    }
-                        event.cachedGift(account.keyPair.pubKey, decryptedContent)?.let {
+
+                    if (cached.isNotBlank()) {
+                        event.cachedGift(account.keyPair.pubKey, cached)?.let {
                             LocalCache.justConsume(it, null)
                             it
                         }
@@ -100,6 +134,8 @@ class EventNotificationConsumer(private val applicationContext: Context) {
                         it
                     }
                 } else if (account.loginWithAmber) {
+                    var cached = AmberUtils.cachedDecryptedContent[event.id]
+                    if (cached == null) {
                         AmberUtils.content = ""
                         AmberUtils.decrypt(
                             event.content,
@@ -107,9 +143,10 @@ class EventNotificationConsumer(private val applicationContext: Context) {
                             event.id,
                             SignerType.NIP44_DECRYPT
                         )
-                    val decryptedContent = AmberUtils.cachedDecryptedContent[event.id] ?: ""
+                        cached = AmberUtils.cachedDecryptedContent[event.id] ?: ""
-                    if (decryptedContent.isNotBlank()) {
+                    }
-                        event.cachedGossip(account.keyPair.pubKey, decryptedContent)?.let {
+                    if (cached.isNotBlank()) {
+                        event.cachedGossip(account.keyPair.pubKey, cached)?.let {
                             LocalCache.justConsume(it, null)
                             it
                         }

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

@@ -61,6 +61,22 @@ class LnZapPaymentResponseEvent(
         }
     }
 
+    fun response(decryptedContent: String): Response? {
+        if (response != null) response
+
+        return try {
+            if (content.isNotEmpty()) {
+                response = mapper.readValue(decryptedContent, Response::class.java)
+                response
+            } else {
+                null
+            }
+        } catch (e: Exception) {
+            Log.w("LnZapPaymentResponseEvent", "Can't parse content as a payment response: $content", e)
+            null
+        }
+    }
+
     companion object {
         const val kind = 23195
     }

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

@@ -123,6 +123,32 @@ class LnZapRequestEvent(
             return LnZapRequestEvent(id.toHexKey(), pubKey, createdAt, tags, message, "")
         }
 
+        fun createPrivateZap(
+            originalNote: EventInterface,
+            relays: Set<String>,
+            pubKey: HexKey,
+            pollOption: Int?,
+            message: String,
+            createdAt: Long = TimeUtils.now()
+        ): LnZapRequestEvent {
+            val content = message
+            var tags = listOf(
+                listOf("e", originalNote.id()),
+                listOf("p", originalNote.pubKey()),
+                listOf("relays") + relays
+            )
+            if (originalNote is AddressableEvent) {
+                tags = tags + listOf(listOf("a", originalNote.address().toTag()))
+            }
+            if (pollOption != null && pollOption >= 0) {
+                tags = tags + listOf(listOf(POLL_OPTION, pollOption.toString()))
+            }
+
+            tags = tags + listOf(listOf("anon", ""))
+
+            return LnZapRequestEvent("", pubKey, createdAt, tags, content, "")
+        }
+
         fun createAnonymous(
             originalNote: EventInterface,
             relays: Set<String>,