fix(DIDCommWrapper): Crash when body is empty string (#124)

atala-prism-sdk/src/commonMain/kotlin/io/iohk/atala/prism/walletsdk/castor/CastorImpl.kt

@@ -28,7 +28,12 @@ import kotlin.jvm.Throws
  * or a more traditional system requiring secure and private identity management, Castor provides the tools and features
  * you need to easily create, manage, and resolve DIDs.
  */
-class CastorImpl(val apollo: Apollo, private val logger: PrismLogger = PrismLoggerImpl(LogComponent.CASTOR)) : Castor {
+class CastorImpl
+@JvmOverloads
+constructor(
+    val apollo: Apollo,
+    private val logger: PrismLogger = PrismLoggerImpl(LogComponent.CASTOR)
+) : Castor {
     var resolvers: Array<DIDResolver> = arrayOf(
         PeerDIDResolver(),
         LongFormPrismDIDResolver(this.apollo)

atala-prism-sdk/src/commonMain/kotlin/io/iohk/atala/prism/walletsdk/castor/shared/CastorShared.kt

@@ -318,7 +318,7 @@ internal class CastorShared {
                         )
                     )
                 )
-                throw CastorError.InitialStateOfDIDChanged()
+                throw CastorError.InitialStateOfDIDChanged(e.message)
             }
 
             val servicesProperty = DIDDocument.Services(services.toTypedArray())

atala-prism-sdk/src/commonMain/kotlin/io/iohk/atala/prism/walletsdk/domain/models/Errors.kt

@@ -390,8 +390,8 @@ constructor(
      *
      * @see CastorError
      */
-    class InitialStateOfDIDChanged : CastorError(
-        "While trying to resolve Prism DID state changed making it invalid"
+    class InitialStateOfDIDChanged(message: String? = null) : CastorError(
+        "While trying to resolve Prism DID state changed making it invalid. $message"
     ) {
         override val code: Int
             get() = 26

atala-prism-sdk/src/commonMain/kotlin/io/iohk/atala/prism/walletsdk/mercury/MercuryImpl.kt

@@ -49,7 +49,9 @@ interface DIDCommProtocol {
  * decentralized system requiring trusted peer-to-peer connections, Mercury provides the tools and features you need to
  * establish, manage, and secure your communications easily.
  */
-class MercuryImpl(
+class MercuryImpl
+@JvmOverloads
+constructor(
     private val castor: Castor,
     private val protocol: DIDCommProtocol,
     private val api: Api,

atala-prism-sdk/src/commonMain/kotlin/io/iohk/atala/prism/walletsdk/mercury/resolvers/DIDCommWrapper.kt

@@ -143,8 +143,12 @@ class DIDCommWrapper(castor: Castor, pluto: Pluto, apollo: Apollo) : DIDCommProt
     override fun packEncrypted(message: Message): String {
         val toString = message.to.toString()
 
-        val element = Json.parseToJsonElement(message.body)
-        val map = jsonObjectToMap(element)
+        val element: JsonElement = if (message.body.isBlank() || message.body.isEmpty()) {
+            Json.parseToJsonElement("{}")
+        } else {
+            Json.parseToJsonElement(message.body)
+        }
+        val map: Map<String, Any?> = jsonObjectToMap(element)
 
         val didCommMsg = org.didcommx.didcomm.message.Message(
             id = message.id,