nip19 parsing.

src/main/scala/Parser.scala

@@ -0,0 +1,33 @@
+import io.circe.parser.*
+import cats.syntax.all.*
+import scoin.*
+import snow.*
+
+import Components.*
+
+object Parser {
+  def parseInput(input: String): Either[
+    String,
+    Event | PrivateKey | AddressPointer | EventPointer | ProfilePointer
+  ] =
+    NIP19.decode(input) match {
+      case Right(pp: ProfilePointer)   => Right(pp)
+      case Right(evp: EventPointer)    => Right(evp)
+      case Right(sk: PrivateKey)       => Right(sk)
+      case Right(addr: AddressPointer) => Right(addr)
+      case Left(_) =>
+        parse(input) match {
+          case Left(err: io.circe.ParsingFailure) =>
+            Left("not valid JSON or NIP-19 code")
+          case Right(json) =>
+            json
+              .as[Event]
+              .leftMap { err =>
+                err.pathToRootString match {
+                  case None       => s"decoding ${err.pathToRootString}"
+                  case Some(path) => s"field $path is missing or wrong"
+                }
+              }
+        }
+    }
+}