Allow creating invoices with description hash (#3966)

lnd-rpc-test/src/test/scala/org/bitcoins/lnd/rpc/LndRpcClientTest.scala

@@ -5,6 +5,7 @@ import org.bitcoins.core.currency.Satoshis
 import org.bitcoins.core.protocol.ln.LnInvoice
 import org.bitcoins.core.protocol.ln.currency._
 import org.bitcoins.core.protocol.script.P2WPKHWitnessSPKV0
+import org.bitcoins.crypto.CryptoUtil
 import org.bitcoins.testkit.fixtures.LndFixture
 
 import scala.concurrent.Future
@@ -31,6 +32,21 @@ class LndRpcClientTest extends LndFixture {
     }
   }
 
+  it must "create an invoice using a description hash" in { lnd =>
+    val memo = "this is my memo"
+    val hash = CryptoUtil.sha256(memo)
+    val amount = Satoshis(1000)
+
+    for {
+      invoiceResult <- lnd.addInvoice(hash, amount, 1000)
+    } yield {
+      val invoice = invoiceResult.invoice
+
+      assert(invoice.lnTags.descriptionHash.exists(_.hash == hash))
+      assert(invoice.amount.map(_.toSatoshis).contains(amount))
+    }
+  }
+
   it must "create an invoice using msats" in { lnd =>
     val memo = "this is my memo"
     val amount = MilliSatoshis(1000)

lnd-rpc/src/main/scala/org/bitcoins/lnd/rpc/LndRpcClient.scala

@@ -195,6 +195,18 @@ class LndRpcClient(val instance: LndInstance, binaryOpt: Option[File] = None)(
     addInvoice(invoice)
   }
 
+  def addInvoice(
+      descriptionHash: Sha256Digest,
+      value: Satoshis,
+      expiry: Long): Future[AddInvoiceResult] = {
+    val invoice: Invoice =
+      Invoice(value = value.toLong,
+              expiry = expiry,
+              descriptionHash = descriptionHash.bytes)
+
+    addInvoice(invoice)
+  }
+
   def addInvoice(
       memo: String,
       value: MilliSatoshis,
@@ -205,6 +217,18 @@ class LndRpcClient(val instance: LndInstance, binaryOpt: Option[File] = None)(
     addInvoice(invoice)
   }
 
+  def addInvoice(
+      descriptionHash: Sha256Digest,
+      value: MilliSatoshis,
+      expiry: Long): Future[AddInvoiceResult] = {
+    val invoice: Invoice =
+      Invoice(valueMsat = value.toLong,
+              expiry = expiry,
+              descriptionHash = descriptionHash.bytes)
+
+    addInvoice(invoice)
+  }
+
   def addInvoice(invoice: Invoice): Future[AddInvoiceResult] = {
     logger.trace("lnd calling addinvoice")