Support for Wallet Connect Api

app/src/main/java/com/vitorpamplona/amethyst/LocalPreferences.kt

@@ -8,6 +8,7 @@ import com.google.gson.reflect.TypeToken
 import com.vitorpamplona.amethyst.model.Account
 import com.vitorpamplona.amethyst.model.RelaySetupInfo
 import com.vitorpamplona.amethyst.model.toByteArray
+import com.vitorpamplona.amethyst.service.model.Contact
 import com.vitorpamplona.amethyst.service.model.ContactListEvent
 import com.vitorpamplona.amethyst.service.model.Event
 import com.vitorpamplona.amethyst.service.model.Event.Companion.getRefinedEvent
@@ -46,6 +47,7 @@ private object PrefKeys {
     const val LANGUAGE_PREFS = "languagePreferences"
     const val TRANSLATE_TO = "translateTo"
     const val ZAP_AMOUNTS = "zapAmounts"
+    const val ZAP_PAYMENT_REQUEST_SERVER = "zapPaymentServer"
     const val LATEST_CONTACT_LIST = "latestContactList"
     const val HIDE_DELETE_REQUEST_DIALOG = "hide_delete_request_dialog"
     const val HIDE_BLOCK_ALERT_DIALOG = "hide_block_alert_dialog"
@@ -183,6 +185,7 @@ object LocalPreferences {
             putString(PrefKeys.LANGUAGE_PREFS, gson.toJson(account.languagePreferences))
             putString(PrefKeys.TRANSLATE_TO, account.translateTo)
             putString(PrefKeys.ZAP_AMOUNTS, gson.toJson(account.zapAmountChoices))
+            putString(PrefKeys.ZAP_PAYMENT_REQUEST_SERVER, gson.toJson(account.zapPaymentRequest))
             putString(PrefKeys.LATEST_CONTACT_LIST, Event.gson.toJson(account.backupContactList))
             putBoolean(PrefKeys.HIDE_DELETE_REQUEST_DIALOG, account.hideDeleteRequestDialog)
             putBoolean(PrefKeys.HIDE_BLOCK_ALERT_DIALOG, account.hideBlockAlertDialog)
@@ -210,6 +213,15 @@ object LocalPreferences {
                 object : TypeToken<List<Long>>() {}.type
             ) ?: listOf(500L, 1000L, 5000L)
 
+            val zapPaymentRequestServer = try {
+                getString(PrefKeys.ZAP_PAYMENT_REQUEST_SERVER, null)?.let {
+                    gson.fromJson(it, Contact::class.java)
+                }
+            } catch (e: Throwable) {
+                e.printStackTrace()
+                null
+            }
+
             val latestContactList = try {
                 getString(PrefKeys.LATEST_CONTACT_LIST, null)?.let {
                     Event.gson.fromJson(it, Event::class.java)
@@ -244,6 +256,7 @@ object LocalPreferences {
                 languagePreferences,
                 translateTo,
                 zapAmountChoices,
+                zapPaymentRequestServer,
                 hideDeleteRequestDialog,
                 hideBlockAlertDialog,
                 latestContactList

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

@@ -11,6 +11,7 @@ import com.vitorpamplona.amethyst.service.model.Contact
 import com.vitorpamplona.amethyst.service.model.ContactListEvent
 import com.vitorpamplona.amethyst.service.model.DeletionEvent
 import com.vitorpamplona.amethyst.service.model.IdentityClaim
+import com.vitorpamplona.amethyst.service.model.LnZapPaymentRequestEvent
 import com.vitorpamplona.amethyst.service.model.LnZapRequestEvent
 import com.vitorpamplona.amethyst.service.model.MetadataEvent
 import com.vitorpamplona.amethyst.service.model.PrivateDmEvent
@@ -60,6 +61,7 @@ class Account(
     var languagePreferences: Map<String, String> = mapOf(),
     var translateTo: String = Locale.getDefault().language,
     var zapAmountChoices: List<Long> = listOf(500L, 1000L, 5000L),
+    var zapPaymentRequest: Contact? = null,
     var hideDeleteRequestDialog: Boolean = false,
     var hideBlockAlertDialog: Boolean = false,
     var backupContactList: ContactListEvent? = null
@@ -164,6 +166,20 @@ class Account(
         return null
     }
 
+    fun hasWalletConnectSetup(): Boolean {
+        return zapPaymentRequest != null
+    }
+
+    fun sendZapPaymentRequestFor(lnInvoice: String) {
+        if (!isWriteable()) return
+
+        zapPaymentRequest?.let {
+            val event = LnZapPaymentRequestEvent.create(lnInvoice, it.pubKeyHex, loggedIn.privKey!!)
+
+            Client.send(event, it.relayUri)
+        }
+    }
+
     fun createZapRequestFor(user: User): LnZapRequestEvent? {
         return createZapRequestFor(user.pubkeyHex)
     }
@@ -559,6 +575,12 @@ class Account(
         saveable.invalidateData()
     }
 
+    fun changeZapPaymentRequest(newServer: Contact?) {
+        zapPaymentRequest = newServer
+        live.invalidateData()
+        saveable.invalidateData()
+    }
+
     fun sendChangeChannel(name: String, about: String, picture: String, channel: Channel) {
         if (!isWriteable()) return
 

app/src/main/java/com/vitorpamplona/amethyst/service/Nip47.kt

@@ -0,0 +1,31 @@
+package com.vitorpamplona.amethyst.ui.note
+
+import android.net.Uri
+import com.vitorpamplona.amethyst.model.decodePublicKey
+import com.vitorpamplona.amethyst.model.toHexKey
+import com.vitorpamplona.amethyst.service.model.Contact
+
+// Rename to the corect nip number when ready.
+object Nip47 {
+    fun parse(uri: String): Contact? {
+        // nostrwalletconnect://b889ff5b1513b641e2a139f661a661364979c5beee91842f8f0ef42ab558e9d4?relay=wss%3A%2F%2Frelay.damus.io&metadata=%7B%22name%22%3A%22Example%22%7D
+
+        val url = Uri.parse(uri)
+
+        if (url.scheme != "nostrwalletconnect") {
+            throw IllegalArgumentException("Not a Wallet Connect QR Code")
+        }
+
+        val pubkey = url.host ?: throw IllegalArgumentException("Hostname cannot be null")
+
+        val pubkeyHex = try {
+            decodePublicKey(pubkey).toHexKey()
+        } catch (e: Exception) {
+            throw IllegalArgumentException("Hostname is not a valid Nostr Pubkey")
+        }
+
+        val relay = url.getQueryParameter("relay")
+
+        return Contact(pubkeyHex, relay)
+    }
+}

app/src/main/java/com/vitorpamplona/amethyst/service/model/Event.kt

@@ -193,6 +193,7 @@ open class Event(
             DeletionEvent.kind -> DeletionEvent(id, pubKey, createdAt, tags, content, sig)
 
             LnZapEvent.kind -> LnZapEvent(id, pubKey, createdAt, tags, content, sig)
+            LnZapPaymentRequestEvent.kind -> LnZapPaymentRequestEvent(id, pubKey, createdAt, tags, content, sig)
             LnZapRequestEvent.kind -> LnZapRequestEvent(id, pubKey, createdAt, tags, content, sig)
             LongTextNoteEvent.kind -> LongTextNoteEvent(id, pubKey, createdAt, tags, content, sig)
             MetadataEvent.kind -> MetadataEvent(id, pubKey, createdAt, tags, content, sig)

app/src/main/java/com/vitorpamplona/amethyst/service/model/LnZapPaymentRequestEvent.kt

@@ -0,0 +1,55 @@
+package com.vitorpamplona.amethyst.service.model
+
+import android.util.Log
+import com.vitorpamplona.amethyst.model.HexKey
+import com.vitorpamplona.amethyst.model.toByteArray
+import com.vitorpamplona.amethyst.model.toHexKey
+import nostr.postr.Utils
+import java.util.Date
+
+class LnZapPaymentRequestEvent(
+    id: HexKey,
+    pubKey: HexKey,
+    createdAt: Long,
+    tags: List<List<String>>,
+    content: String,
+    sig: HexKey
+) : Event(id, pubKey, createdAt, kind, tags, content, sig) {
+
+    fun lnInvoice(privKey: ByteArray): String? {
+        return try {
+            val sharedSecret = Utils.getSharedSecret(privKey, pubKey.toByteArray())
+
+            return Utils.decrypt(content, sharedSecret)
+        } catch (e: Exception) {
+            Log.w("BookmarkList", "Error decrypting the message ${e.message}")
+            null
+        }
+    }
+
+    companion object {
+        const val kind = 23194
+
+        fun create(
+            lnInvoice: String,
+            walletServicePubkey: String,
+            privateKey: ByteArray,
+            createdAt: Long = Date().time / 1000
+        ): LnZapPaymentRequestEvent {
+            val pubKey = Utils.pubkeyCreate(privateKey)
+
+            val content = Utils.encrypt(
+                lnInvoice,
+                privateKey,
+                walletServicePubkey.toByteArray()
+            )
+
+            val tags = mutableListOf<List<String>>()
+            tags.add(listOf("p", walletServicePubkey))
+
+            val id = generateId(pubKey.toHexKey(), createdAt, kind, tags, content)
+            val sig = Utils.sign(id, privateKey)
+            return LnZapPaymentRequestEvent(id.toHexKey(), pubKey.toHexKey(), createdAt, tags, content, sig.toHexKey())
+        }
+    }
+}

app/src/main/java/com/vitorpamplona/amethyst/service/relays/Client.kt

@@ -64,8 +64,24 @@ object Client : RelayPool.Listener {
         RelayPool.sendFilterOnlyIfDisconnected()
     }
 
-    fun send(signedEvent: EventInterface) {
-        RelayPool.send(signedEvent)
+    fun send(signedEvent: EventInterface, relay: String? = null) {
+        if (relay == null) {
+            RelayPool.send(signedEvent)
+        } else {
+            val useConnectedRelay = relays.filter { it.url == relay }
+
+            if (useConnectedRelay.isNotEmpty()) {
+                useConnectedRelay.forEach {
+                    it.send(signedEvent)
+                }
+            } else {
+                /** temporary connection */
+                Relay(relay, false, true, emptySet()).requestAndWatch() {
+                    it.send(signedEvent)
+                    it.disconnect()
+                }
+            }
+        }
     }
 
     fun close(subscriptionId: String) {

app/src/main/java/com/vitorpamplona/amethyst/service/relays/Relay.kt

@@ -53,6 +53,16 @@ class Relay(
 
     @Synchronized
     fun requestAndWatch() {
+        requestAndWatch {
+            // Sends everything.
+            Client.allSubscriptions().forEach {
+                sendFilter(requestId = it)
+            }
+        }
+    }
+
+    @Synchronized
+    fun requestAndWatch(onConnected: (Relay) -> Unit) {
         if (socket != null) return
 
         try {
@@ -65,12 +75,9 @@ class Relay(
                 override fun onOpen(webSocket: WebSocket, response: Response) {
                     isReady = true
                     ping = response.receivedResponseAtMillis - response.sentRequestAtMillis
-
                     // Log.w("Relay", "Relay OnOpen, Loading All subscriptions $url")
-                    // Sends everything.
-                    Client.allSubscriptions().forEach {
-                        sendFilter(requestId = it)
-                    }
+                    onConnected(this@Relay)
+
                     listeners.forEach { it.onRelayStateChange(this@Relay, Type.CONNECT, null) }
                 }
 

app/src/main/java/com/vitorpamplona/amethyst/ui/note/ReactionsRow.kt

@@ -1,29 +1,23 @@
 package com.vitorpamplona.amethyst.ui.note
 
 import android.widget.Toast
-import androidx.compose.animation.animateContentSize
 import androidx.compose.foundation.ExperimentalFoundationApi
 import androidx.compose.foundation.combinedClickable
 import androidx.compose.foundation.interaction.MutableInteractionSource
 import androidx.compose.foundation.layout.Arrangement
-import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.ExperimentalLayoutApi
 import androidx.compose.foundation.layout.FlowRow
 import androidx.compose.foundation.layout.Row
-import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.shape.RoundedCornerShape
-import androidx.compose.foundation.text.KeyboardOptions
 import androidx.compose.material.Button
 import androidx.compose.material.ButtonDefaults
 import androidx.compose.material.Icon
 import androidx.compose.material.IconButton
 import androidx.compose.material.MaterialTheme
-import androidx.compose.material.OutlinedTextField
-import androidx.compose.material.Surface
 import androidx.compose.material.Text
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.Bolt
@@ -47,27 +41,17 @@ import androidx.compose.ui.platform.LocalUriHandler
 import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.semantics.Role
-import androidx.compose.ui.text.input.KeyboardCapitalization
-import androidx.compose.ui.text.input.KeyboardType
-import androidx.compose.ui.text.input.TextFieldValue
 import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.unit.IntOffset
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
-import androidx.compose.ui.window.Dialog
-import androidx.compose.ui.window.DialogProperties
 import androidx.compose.ui.window.Popup
-import androidx.lifecycle.ViewModel
-import androidx.lifecycle.viewmodel.compose.viewModel
 import coil.compose.AsyncImage
 import coil.request.CachePolicy
 import coil.request.ImageRequest
 import com.vitorpamplona.amethyst.R
-import com.vitorpamplona.amethyst.model.Account
 import com.vitorpamplona.amethyst.model.Note
-import com.vitorpamplona.amethyst.ui.actions.CloseButton
 import com.vitorpamplona.amethyst.ui.actions.NewPostView
-import com.vitorpamplona.amethyst.ui.actions.SaveButton
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.AccountViewModel
 import com.vitorpamplona.amethyst.ui.theme.BitcoinOrange
 import kotlinx.coroutines.Dispatchers
@@ -546,153 +530,6 @@ fun ZapAmountChoicePopup(baseNote: Note, accountViewModel: AccountViewModel, onD
     }
 }
 
-class UpdateZapAmountViewModel : ViewModel() {
-    private var account: Account? = null
-
-    var nextAmount by mutableStateOf(TextFieldValue(""))
-    var amountSet by mutableStateOf(listOf<Long>())
-
-    fun load(account: Account) {
-        this.account = account
-        this.amountSet = account.zapAmountChoices
-    }
-
-    fun toListOfAmounts(commaSeparatedAmounts: String): List<Long> {
-        return commaSeparatedAmounts.split(",").map { it.trim().toLongOrNull() ?: 0 }
-    }
-
-    fun addAmount() {
-        val newValue = nextAmount.text.trim().toLongOrNull()
-        if (newValue != null) {
-            amountSet = amountSet + newValue
-        }
-
-        nextAmount = TextFieldValue("")
-    }
-
-    fun removeAmount(amount: Long) {
-        amountSet = amountSet - amount
-    }
-
-    fun sendPost() {
-        account?.changeZapAmounts(amountSet)
-        nextAmount = TextFieldValue("")
-    }
-
-    fun cancel() {
-        nextAmount = TextFieldValue("")
-    }
-
-    fun hasChanged(): Boolean {
-        return amountSet != account?.zapAmountChoices
-    }
-}
-
-@OptIn(ExperimentalLayoutApi::class)
-@Composable
-fun UpdateZapAmountDialog(onClose: () -> Unit, account: Account) {
-    val postViewModel: UpdateZapAmountViewModel = viewModel()
-
-    // initialize focus reference to be able to request focus programmatically
-//    val keyboardController = LocalSoftwareKeyboardController.current
-
-    LaunchedEffect(account) {
-        postViewModel.load(account)
-    }
-
-    Dialog(
-        onDismissRequest = { onClose() },
-        properties = DialogProperties(
-            dismissOnClickOutside = false,
-            usePlatformDefaultWidth = false
-        )
-    ) {
-        Surface() {
-            Column(modifier = Modifier.padding(10.dp)) {
-                Row(
-                    modifier = Modifier.fillMaxWidth(),
-                    horizontalArrangement = Arrangement.SpaceBetween,
-                    verticalAlignment = Alignment.CenterVertically
-                ) {
-                    CloseButton(onCancel = {
-                        postViewModel.cancel()
-                        onClose()
-                    })
-
-                    SaveButton(
-                        onPost = {
-                            postViewModel.sendPost()
-                            onClose()
-                        },
-                        isActive = postViewModel.hasChanged()
-                    )
-                }
-
-                Spacer(modifier = Modifier.height(10.dp))
-
-                Row(modifier = Modifier.fillMaxWidth()) {
-                    Column(modifier = Modifier.animateContentSize()) {
-                        FlowRow(modifier = Modifier.fillMaxWidth(), horizontalArrangement = Arrangement.Center) {
-                            postViewModel.amountSet.forEach { amountInSats ->
-                                Button(
-                                    modifier = Modifier.padding(horizontal = 3.dp),
-                                    shape = RoundedCornerShape(20.dp),
-                                    colors = ButtonDefaults
-                                        .buttonColors(
-                                            backgroundColor = MaterialTheme.colors.primary
-                                        ),
-                                    onClick = {
-                                        postViewModel.removeAmount(amountInSats)
-                                    }
-                                ) {
-                                    Text("⚡ ${showAmount(amountInSats.toBigDecimal().setScale(1))} ✖", color = Color.White, textAlign = TextAlign.Center)
-                                }
-                            }
-                        }
-                    }
-                }
-
-                Spacer(modifier = Modifier.height(10.dp))
-
-                Row(modifier = Modifier.fillMaxWidth(), verticalAlignment = Alignment.CenterVertically) {
-                    OutlinedTextField(
-                        label = { Text(text = stringResource(R.string.new_amount_in_sats)) },
-                        value = postViewModel.nextAmount,
-                        onValueChange = {
-                            postViewModel.nextAmount = it
-                        },
-                        keyboardOptions = KeyboardOptions.Default.copy(
-                            capitalization = KeyboardCapitalization.None,
-                            keyboardType = KeyboardType.Number
-                        ),
-                        placeholder = {
-                            Text(
-                                text = "100, 1000, 5000",
-                                color = MaterialTheme.colors.onSurface.copy(alpha = 0.32f)
-                            )
-                        },
-                        singleLine = true,
-                        modifier = Modifier
-                            .padding(end = 10.dp)
-                            .weight(1f)
-                    )
-
-                    Button(
-                        onClick = { postViewModel.addAmount() },
-                        shape = RoundedCornerShape(20.dp),
-                        colors = ButtonDefaults
-                            .buttonColors(
-                                backgroundColor = MaterialTheme.colors.primary
-                            )
-                    ) {
-                        Text(text = stringResource(R.string.add), color = Color.White)
-                    }
-                }
-            }
-        }
-    }
-}
-
 fun showCount(count: Int?): String {
     if (count == null) return ""
     if (count == 0) return ""

app/src/main/java/com/vitorpamplona/amethyst/ui/note/UpdateZapAmountDialog.kt

@@ -0,0 +1,318 @@
+package com.vitorpamplona.amethyst.ui.note
+
+import android.widget.Toast
+import androidx.compose.animation.animateContentSize
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.ExperimentalLayoutApi
+import androidx.compose.foundation.layout.FlowRow
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.foundation.text.KeyboardOptions
+import androidx.compose.material.Button
+import androidx.compose.material.ButtonDefaults
+import androidx.compose.material.Divider
+import androidx.compose.material.Icon
+import androidx.compose.material.IconButton
+import androidx.compose.material.MaterialTheme
+import androidx.compose.material.OutlinedTextField
+import androidx.compose.material.Surface
+import androidx.compose.material.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.painterResource
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.text.input.KeyboardCapitalization
+import androidx.compose.ui.text.input.KeyboardType
+import androidx.compose.ui.text.input.TextFieldValue
+import androidx.compose.ui.text.style.TextAlign
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.window.Dialog
+import androidx.compose.ui.window.DialogProperties
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewmodel.compose.viewModel
+import com.vitorpamplona.amethyst.R
+import com.vitorpamplona.amethyst.model.Account
+import com.vitorpamplona.amethyst.service.model.Contact
+import com.vitorpamplona.amethyst.ui.actions.CloseButton
+import com.vitorpamplona.amethyst.ui.actions.SaveButton
+import com.vitorpamplona.amethyst.ui.qrcode.SimpleQrCodeScanner
+import kotlinx.coroutines.launch
+
+class UpdateZapAmountViewModel : ViewModel() {
+    private var account: Account? = null
+
+    var nextAmount by mutableStateOf(TextFieldValue(""))
+    var amountSet by mutableStateOf(listOf<Long>())
+    var walletConnectRelay by mutableStateOf(TextFieldValue(""))
+    var walletConnectPubkey by mutableStateOf(TextFieldValue(""))
+
+    fun load(account: Account) {
+        this.account = account
+        this.amountSet = account.zapAmountChoices
+        this.walletConnectPubkey = account.zapPaymentRequest?.pubKeyHex?.let { TextFieldValue(it) } ?: TextFieldValue("")
+        this.walletConnectRelay = account.zapPaymentRequest?.relayUri?.let { TextFieldValue(it) } ?: TextFieldValue("")
+    }
+
+    fun toListOfAmounts(commaSeparatedAmounts: String): List<Long> {
+        return commaSeparatedAmounts.split(",").map { it.trim().toLongOrNull() ?: 0 }
+    }
+
+    fun addAmount() {
+        val newValue = nextAmount.text.trim().toLongOrNull()
+        if (newValue != null) {
+            amountSet = amountSet + newValue
+        }
+
+        nextAmount = TextFieldValue("")
+    }
+
+    fun removeAmount(amount: Long) {
+        amountSet = amountSet - amount
+    }
+
+    fun sendPost() {
+        account?.changeZapAmounts(amountSet)
+
+        if (walletConnectRelay.text.isNotBlank() && walletConnectPubkey.text.isNotBlank()) {
+            account?.changeZapPaymentRequest(Contact(walletConnectPubkey.text, walletConnectRelay.text))
+        } else {
+            account?.changeZapPaymentRequest(null)
+        }
+
+        nextAmount = TextFieldValue("")
+    }
+
+    fun cancel() {
+        nextAmount = TextFieldValue("")
+    }
+
+    fun hasChanged(): Boolean {
+        return (
+            amountSet != account?.zapAmountChoices ||
+                walletConnectPubkey.text != (account?.zapPaymentRequest?.pubKeyHex ?: "") ||
+                walletConnectRelay.text != (account?.zapPaymentRequest?.relayUri ?: "")
+            )
+    }
+}
+
+@OptIn(ExperimentalLayoutApi::class)
+@Composable
+fun UpdateZapAmountDialog(onClose: () -> Unit, account: Account) {
+    val context = LocalContext.current
+    val scope = rememberCoroutineScope()
+    val postViewModel: UpdateZapAmountViewModel = viewModel()
+
+    LaunchedEffect(account) {
+        postViewModel.load(account)
+    }
+
+    Dialog(
+        onDismissRequest = { onClose() },
+        properties = DialogProperties(
+            dismissOnClickOutside = false,
+            usePlatformDefaultWidth = false
+        )
+    ) {
+        Surface() {
+            Column(modifier = Modifier.padding(10.dp)) {
+                Row(
+                    modifier = Modifier.fillMaxWidth(),
+                    horizontalArrangement = Arrangement.SpaceBetween,
+                    verticalAlignment = Alignment.CenterVertically
+                ) {
+                    CloseButton(onCancel = {
+                        postViewModel.cancel()
+                        onClose()
+                    })
+
+                    SaveButton(
+                        onPost = {
+                            postViewModel.sendPost()
+                            onClose()
+                        },
+                        isActive = postViewModel.hasChanged()
+                    )
+                }
+
+                Spacer(modifier = Modifier.height(10.dp))
+
+                Row(modifier = Modifier.fillMaxWidth()) {
+                    Column(modifier = Modifier.animateContentSize()) {
+                        FlowRow(
+                            modifier = Modifier.fillMaxWidth(),
+                            horizontalArrangement = Arrangement.Center
+                        ) {
+                            postViewModel.amountSet.forEach { amountInSats ->
+                                Button(
+                                    modifier = Modifier.padding(horizontal = 3.dp),
+                                    shape = RoundedCornerShape(20.dp),
+                                    colors = ButtonDefaults.buttonColors(
+                                        backgroundColor = MaterialTheme.colors.primary
+                                    ),
+                                    onClick = {
+                                        postViewModel.removeAmount(amountInSats)
+                                    }
+                                ) {
+                                    Text(
+                                        "⚡ ${showAmount(amountInSats.toBigDecimal().setScale(1))} ✖",
+                                        color = Color.White,
+                                        textAlign = TextAlign.Center
+                                    )
+                                }
+                            }
+                        }
+                    }
+                }
+
+                Spacer(modifier = Modifier.height(10.dp))
+
+                Row(
+                    modifier = Modifier
+                        .fillMaxWidth()
+                        .padding(vertical = 5.dp),
+                    verticalAlignment = Alignment.CenterVertically
+                ) {
+                    OutlinedTextField(
+                        label = { Text(text = stringResource(R.string.new_amount_in_sats)) },
+                        value = postViewModel.nextAmount,
+                        onValueChange = {
+                            postViewModel.nextAmount = it
+                        },
+                        keyboardOptions = KeyboardOptions.Default.copy(
+                            capitalization = KeyboardCapitalization.None,
+                            keyboardType = KeyboardType.Number
+                        ),
+                        placeholder = {
+                            Text(
+                                text = "100, 1000, 5000",
+                                color = MaterialTheme.colors.onSurface.copy(alpha = 0.32f)
+                            )
+                        },
+                        singleLine = true,
+                        modifier = Modifier
+                            .padding(end = 10.dp)
+                            .weight(1f)
+                    )
+
+                    Button(
+                        onClick = { postViewModel.addAmount() },
+                        shape = RoundedCornerShape(20.dp),
+                        colors = ButtonDefaults.buttonColors(
+                            backgroundColor = MaterialTheme.colors.primary
+                        )
+                    ) {
+                        Text(text = stringResource(R.string.add), color = Color.White)
+                    }
+                }
+
+                Divider(
+                    modifier = Modifier.padding(vertical = 10.dp),
+                    thickness = 0.25.dp
+                )
+
+                var qrScanning by remember { mutableStateOf(false) }
+
+                Row(
+                    modifier = Modifier
+                        .fillMaxWidth()
+                        .padding(vertical = 5.dp),
+                    verticalAlignment = Alignment.CenterVertically
+                ) {
+                    Text(stringResource(id = R.string.wallet_connect_service), Modifier.weight(1f))
+                    IconButton(onClick = {
+                        qrScanning = true
+                    }) {
+                        Icon(
+                            painter = painterResource(R.drawable.ic_qrcode),
+                            null,
+                            modifier = Modifier.size(24.dp),
+                            tint = MaterialTheme.colors.primary
+                        )
+                    }
+                }
+
+                if (qrScanning) {
+                    SimpleQrCodeScanner {
+                        qrScanning = false
+                        if (!it.isNullOrEmpty()) {
+                            try {
+                                val contact = Nip47.parse(it)
+                                if (contact != null) {
+                                    postViewModel.walletConnectPubkey = TextFieldValue(contact.pubKeyHex)
+                                    postViewModel.walletConnectRelay = TextFieldValue(contact.relayUri ?: "")
+                                }
+                            } catch (e: IllegalArgumentException) {
+                                scope.launch {
+                                    Toast.makeText(context, e.message, Toast.LENGTH_SHORT).show()
+                                }
+                            }
+                        }
+                    }
+                }
+
+                Row(
+                    modifier = Modifier
+                        .fillMaxWidth()
+                        .padding(vertical = 5.dp),
+                    verticalAlignment = Alignment.CenterVertically
+                ) {
+                    OutlinedTextField(
+                        label = { Text(text = stringResource(R.string.wallet_connect_service_pubkey)) },
+                        value = postViewModel.walletConnectPubkey,
+                        onValueChange = {
+                            postViewModel.walletConnectPubkey = it
+                        },
+                        keyboardOptions = KeyboardOptions.Default.copy(
+                            capitalization = KeyboardCapitalization.None
+                        ),
+                        placeholder = {
+                            Text(
+                                text = "npub, hex",
+                                color = MaterialTheme.colors.onSurface.copy(alpha = 0.32f)
+                            )
+                        },
+                        singleLine = true,
+                        modifier = Modifier.weight(1f)
+                    )
+                }
+
+                Row(
+                    modifier = Modifier
+                        .fillMaxWidth()
+                        .padding(vertical = 5.dp),
+                    verticalAlignment = Alignment.CenterVertically
+                ) {
+                    OutlinedTextField(
+                        label = { Text(text = stringResource(R.string.wallet_connect_service_relay)) },
+                        modifier = Modifier.weight(1f),
+                        value = postViewModel.walletConnectRelay,
+                        onValueChange = { postViewModel.walletConnectRelay = it },
+                        placeholder = {
+                            Text(
+                                text = "relay.server.com",
+                                color = MaterialTheme.colors.onSurface.copy(alpha = 0.32f),
+                                maxLines = 1
+                            )
+                        },
+                        singleLine = true
+                    )
+                }
+            }
+        }
+    }
+}

app/src/main/java/com/vitorpamplona/amethyst/ui/qrcode/QrCodeScanner.kt

@@ -12,10 +12,8 @@ import com.vitorpamplona.amethyst.R
 import com.vitorpamplona.amethyst.service.nip19.Nip19
 
 @Composable
-fun QrCodeScanner(onScan: (String?) -> Unit) {
-    val lifecycleOwner = LocalLifecycleOwner.current
-
-    val parseQrResult = { it: String ->
+fun NIP19QrCodeScanner(onScan: (String?) -> Unit) {
+    SimpleQrCodeScanner {
         try {
             val nip19 = Nip19.uriToRoute(it)
             val startingPage = when (nip19?.type) {
@@ -34,11 +32,16 @@ fun QrCodeScanner(onScan: (String?) -> Unit) {
             onScan(null)
         }
     }
+}
+
+@Composable
+fun SimpleQrCodeScanner(onScan: (String?) -> Unit) {
+    val lifecycleOwner = LocalLifecycleOwner.current
 
     val qrLauncher =
         rememberLauncherForActivityResult(ScanContract()) {
             if (it.contents != null) {
-                parseQrResult(it.contents)
+                onScan(it.contents)
             } else {
                 onScan(null)
             }

app/src/main/java/com/vitorpamplona/amethyst/ui/qrcode/ShowQRDialog.kt

@@ -37,7 +37,7 @@ import com.vitorpamplona.amethyst.model.User
 import com.vitorpamplona.amethyst.ui.actions.CloseButton
 import com.vitorpamplona.amethyst.ui.components.ResizeImage
 import com.vitorpamplona.amethyst.ui.components.RobohashAsyncImageProxy
-import com.vitorpamplona.amethyst.ui.qrcode.QrCodeScanner
+import com.vitorpamplona.amethyst.ui.qrcode.NIP19QrCodeScanner
 
 @Composable
 fun ShowQRDialog(user: User, onScan: (String) -> Unit, onClose: () -> Unit) {
@@ -135,7 +135,7 @@ fun ShowQRDialog(user: User, onScan: (String) -> Unit, onClose: () -> Unit) {
                             }
                         }
                     } else {
-                        QrCodeScanner {
+                        NIP19QrCodeScanner {
                             if (it.isNullOrEmpty()) {
                                 presenting = true
                             } else {

app/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/AccountViewModel.kt

@@ -64,9 +64,13 @@ class AccountViewModel(private val account: Account) : ViewModel() {
             message,
             zapRequest?.toJson(),
             onSuccess = {
-                runCatching {
-                    val intent = Intent(Intent.ACTION_VIEW, Uri.parse("lightning:$it"))
-                    ContextCompat.startActivity(context, intent, null)
+                if (account.hasWalletConnectSetup()) {
+                    account.sendZapPaymentRequestFor(it)
+                } else {
+                    runCatching {
+                        val intent = Intent(Intent.ACTION_VIEW, Uri.parse("lightning:$it"))
+                        ContextCompat.startActivity(context, intent, null)
+                    }
                 }
             },
             onError = onError

app/src/main/res/values/strings.xml

@@ -251,10 +251,12 @@
     <string name="bookmarks">Bookmarks</string>
     <string name="private_bookmarks">Private Bookmarks</string>
     <string name="public_bookmarks">Public Bookmarks</string>
-
     <string name="add_to_private_bookmarks">Add to Private Bookmarks</string>
     <string name="add_to_public_bookmarks">Add to Public Bookmarks</string>
-
     <string name="remove_from_private_bookmarks">Remove from Private Bookmarks</string>
     <string name="remove_from_public_bookmarks">Remove from Public Bookmarks</string>
+
+    <string name="wallet_connect_service">Wallet Connect Service</string>
+    <string name="wallet_connect_service_pubkey">Wallet Connect Pubkey</string>
+    <string name="wallet_connect_service_relay">Wallet Connect Relay</string>
 </resources>