Add LNURL writers (#4927)

app-commons/src/main/scala/org/bitcoins/commons/serializers/JsonWriters.scala

@@ -16,6 +16,7 @@ import org.bitcoins.core.wallet.fee.SatoshisPerVirtualByte
 import org.bitcoins.crypto._
 import play.api.libs.json._
 
+import java.net.URL
 import scala.collection.mutable
 
 // for mapWrites below
@@ -23,6 +24,8 @@ import scala.language.implicitConversions
 
 object JsonWriters {
 
+  implicit val urlWrites: Writes[URL] = (url: URL) => JsString(url.toString)
+
   implicit object HashTypeWrites extends Writes[HashType] {
 
     override def writes(hash: HashType): JsValue =

lnurl/src/main/scala/org/bitcoins/lnurl/LnURLClient.scala

@@ -73,21 +73,20 @@ class LnURLClient(proxyParams: Option[Socks5ProxyParams])(implicit
   def getInvoice(
       pay: LnURLPayResponse,
       amount: LnCurrencyUnit): Future[LnInvoice] = {
-    getInvoice(pay, amount.toSatoshis)
-  }
-
-  def getInvoice(
-      pay: LnURLPayResponse,
-      amount: MilliSatoshis): Future[LnInvoice] = {
-    getInvoice(pay, amount.toSatoshis)
+    getInvoice(pay, amount.toMSat)
   }
 
   def getInvoice(
       pay: LnURLPayResponse,
       amount: CurrencyUnit): Future[LnInvoice] = {
-    val msats = MilliSatoshis(amount)
+    getInvoice(pay, MilliSatoshis(amount))
+  }
+
+  def getInvoice(
+      pay: LnURLPayResponse,
+      amount: MilliSatoshis): Future[LnInvoice] = {
     val symbol = if (pay.callback.toString.contains("?")) "&" else "?"
-    val url = s"${pay.callback}${symbol}amount=${msats.toLong}"
+    val url = s"${pay.callback}${symbol}amount=${amount.toLong}"
     sendRequestAndParse[LnURLPayInvoice](Get(url)).map(_.pr)
   }
 

lnurl/src/main/scala/org/bitcoins/lnurl/json/LnURLJsonModels.scala

@@ -4,6 +4,7 @@ import org.bitcoins.core.protocol.ln.currency.MilliSatoshis
 import org.bitcoins.lnurl.json.LnURLTag._
 import play.api.libs.json._
 import org.bitcoins.commons.serializers.JsonReaders._
+import org.bitcoins.commons.serializers.JsonWriters._
 import org.bitcoins.core.protocol.ln.LnInvoice
 
 import java.net._
@@ -22,6 +23,9 @@ object LnURLJsonModels {
 
   implicit val LnURLStatusReads: Reads[LnURLStatus] = Json.reads[LnURLStatus]
 
+  implicit val LnURLStatusWrites: OWrites[LnURLStatus] =
+    Json.writes[LnURLStatus]
+
   case class LnURLSuccessAction(
       tag: SuccessActionTag,
       message: Option[String],
@@ -33,6 +37,9 @@ object LnURLJsonModels {
   implicit val LnURLSuccessActionReads: Reads[LnURLSuccessAction] =
     Json.reads[LnURLSuccessAction]
 
+  implicit val LnURLSuccessActionWrites: OWrites[LnURLSuccessAction] =
+    Json.writes[LnURLSuccessAction]
+
   case class LnURLPayResponse(
       callback: URL,
       maxSendable: MilliSatoshis,
@@ -46,6 +53,10 @@ object LnURLJsonModels {
   implicit val LnURLPayResponseReads: Reads[LnURLPayResponse] =
     Json.reads[LnURLPayResponse]
 
+  implicit val LnURLPayResponseWrites: OWrites[LnURLPayResponse] = { o =>
+    Json.writes[LnURLPayResponse].writes(o) ++ Json.obj("tag" -> "payRequest")
+  }
+
   case class LnURLPayInvoice(
       pr: LnInvoice,
       successAction: Option[LnURLSuccessAction])
@@ -54,6 +65,11 @@ object LnURLJsonModels {
   implicit val LnURLPayInvoiceReads: Reads[LnURLPayInvoice] =
     Json.reads[LnURLPayInvoice]
 
+  implicit val LnURLPayInvoiceWrites: OWrites[LnURLPayInvoice] = { o =>
+    Json.writes[LnURLPayInvoice].writes(o) ++ Json.obj(
+      "routes" -> JsArray.empty)
+  }
+
   case class LnURLWithdrawResponse(
       callback: URL,
       k1: String,
@@ -67,6 +83,12 @@ object LnURLJsonModels {
   implicit val LnURLWithdrawResponseReads: Reads[LnURLWithdrawResponse] =
     Json.reads[LnURLWithdrawResponse]
 
+  implicit val LnURLWithdrawResponseWrites: OWrites[LnURLWithdrawResponse] = {
+    o =>
+      Json.writes[LnURLWithdrawResponse].writes(o) ++ Json.obj(
+        "tag" -> "withdrawRequest")
+  }
+
   implicit val LnURLResponseReads: Reads[LnURLResponse] = {
     case other @ (JsNull | _: JsBoolean | JsNumber(_) | JsString(_) | JsArray(
           _)) =>