qml: add lnurl-pay comment feature

electrum/gui/qml/components/LnurlPayRequestDialog.qml

@@ -11,10 +11,9 @@ ElDialog {
     id: dialog
 
     title: qsTr('LNURL Payment request')
+    iconSource: '../../../icons/link.png'
 
-    // property var lnurlData
     property InvoiceParser invoiceParser
-    // property alias lnurlData: dialog.invoiceParser.lnurlData
 
     standardButtons: Dialog.Cancel
 
@@ -26,24 +25,30 @@ ElDialog {
 
     GridLayout {
         columns: 2
-        implicitWidth: parent.width
+
+        width: parent.width
 
         Label {
             text: qsTr('Provider')
+            color: Material.accentColor
         }
         Label {
             text: invoiceParser.lnurlData['domain']
         }
         Label {
             text: qsTr('Description')
+            color: Material.accentColor
         }
         Label {
             text: invoiceParser.lnurlData['metadata_plaintext']
+            Layout.fillWidth: true
+            wrapMode: Text.Wrap
         }
         Label {
             text: invoiceParser.lnurlData['min_sendable_sat'] == invoiceParser.lnurlData['max_sendable_sat']
                     ? qsTr('Amount')
                     : qsTr('Amount range')
+            color: Material.accentColor
         }
         Label {
             text: invoiceParser.lnurlData['min_sendable_sat'] == invoiceParser.lnurlData['max_sendable_sat']
@@ -53,12 +58,21 @@ ElDialog {
                     : invoiceParser.lnurlData['min_sendable_sat'] + ' < amount < ' + invoiceParser.lnurlData['max_sendable_sat']
         }
 
+        TextArea {
+            id: comment
+            Layout.columnSpan: 2
+            Layout.preferredWidth: parent.width
+            Layout.minimumHeight: 80
+            wrapMode: TextEdit.Wrap
+            placeholderText: qsTr('Enter an (optional) message for the receiver')
+        }
+
         Button {
             Layout.columnSpan: 2
             Layout.alignment: Qt.AlignHCenter
             text: qsTr('Proceed')
             onClicked: {
-                invoiceParser.lnurlGetInvoice(invoiceParser.lnurlData['min_sendable_sat'])
+                invoiceParser.lnurlGetInvoice(invoiceParser.lnurlData['min_sendable_sat'], comment.text)
                 dialog.close()
             }
         }

electrum/gui/qml/qeinvoice.py

@@ -450,21 +450,27 @@ class QEInvoiceParser(QEInvoice):
             'callback_url' : lnurldata.callback_url,
             'min_sendable_sat': lnurldata.min_sendable_sat,
             'max_sendable_sat': lnurldata.max_sendable_sat,
-            'metadata_plaintext': lnurldata.metadata_plaintext
+            'metadata_plaintext': lnurldata.metadata_plaintext,
+            'comment_allowed': lnurldata.comment_allowed
         }
         self.setValidLNURLPayRequest()
         self.lnurlRetrieved.emit()
 
     @pyqtSlot('quint64')
-    def lnurlGetInvoice(self, amount):
+    @pyqtSlot('quint64', str)
+    def lnurlGetInvoice(self, amount, comment=None):
         assert self._lnurlData
 
+        if self._lnurlData['comment_allowed'] == 0:
+            comment = None
+
         self._logger.debug(f'fetching callback url {self._lnurlData["callback_url"]}')
         def fetch_invoice_task():
             try:
-                coro = callback_lnurl(self._lnurlData['callback_url'], {
-                    'amount': amount * 1000 # msats
-                })
+                params = { 'amount': amount * 1000 }
+                if comment:
+                    params['comment'] = comment
+                coro = callback_lnurl(self._lnurlData['callback_url'], params)
                 fut = asyncio.run_coroutine_threadsafe(coro, self._wallet.wallet.network.asyncio_loop)
                 self.on_lnurl_invoice(fut.result())
             except Exception as e: