qml: let user enter lnurl6 amount

electrum/gui/qml/components/LnurlPayRequestDialog.qml

@@ -46,18 +46,27 @@ ElDialog {
                 Layout.fillWidth: true
                 wrapMode: Text.Wrap
             }
+
             Label {
-                text: invoiceParser.lnurlData['min_sendable_sat'] == invoiceParser.lnurlData['max_sendable_sat']
-                        ? qsTr('Amount')
-                        : qsTr('Amount range')
+                text: qsTr('Amount')
                 color: Material.accentColor
             }
+
+            BtcField {
+                id: amountBtc
+                text: Config.formatSats(invoiceParser.lnurlData['min_sendable_sat'])
+		enabled: invoiceParser.lnurlData['min_sendable_sat'] != invoiceParser.lnurlData['max_sendable_sat']
+                fiatfield: null
+                Layout.preferredWidth: parent.width /3
+		onTextAsSatsChanged: {
+                    invoiceParser.amountOverride = textAsSats
+                }
+            }
             Label {
+                Layout.columnSpan: 2
                 text: invoiceParser.lnurlData['min_sendable_sat'] == invoiceParser.lnurlData['max_sendable_sat']
-                        ? invoiceParser.lnurlData['min_sendable_sat'] == 0
-                            ? qsTr('Unspecified')
-                            : invoiceParser.lnurlData['min_sendable_sat']
-                        : invoiceParser.lnurlData['min_sendable_sat'] + ' < amount < ' + invoiceParser.lnurlData['max_sendable_sat']
+                        ? ''
+                        : qsTr('Amount must be between %1 and %2').arg(Config.formatSats(invoiceParser.lnurlData['min_sendable_sat'])).arg(Config.formatSats(invoiceParser.lnurlData['max_sendable_sat'])) + Config.baseUnit
             }
 
             TextArea {
@@ -86,7 +95,7 @@ ElDialog {
             icon.source: '../../icons/confirmed.png'
             enabled: valid
             onClicked: {
-                invoiceParser.lnurlGetInvoice(invoiceParser.lnurlData['min_sendable_sat'], comment.text)
+                invoiceParser.lnurlGetInvoice(comment.text)
                 dialog.close()
             }
         }

electrum/gui/qml/qeinvoice.py

@@ -552,6 +552,15 @@ class QEInvoiceParser(QEInvoice):
     def lnurlGetInvoice(self, amount, comment=None):
         assert self._lnurlData
 
+        amount = self.amountOverride.satsInt
+        if self.lnurlData['min_sendable_sat'] != 0:
+            try:
+                assert amount >= self.lnurlData['min_sendable_sat']
+                assert amount <= self.lnurlData['max_sendable_sat']
+            except:
+                self.lnurlError.emit('lnurl', _('Amount out of bounds'))
+                return
+
         if self._lnurlData['comment_allowed'] == 0:
             comment = None