Green cert data update (#61)

Author: oleksandrsarapulovgl

decoder/src/main/java/dgca/verifier/app/decoder/cbor/CborService.kt

@@ -25,14 +25,20 @@ package dgca.verifier.app.decoder.cbor
 import dgca.verifier.app.decoder.model.GreenCertificate
 import dgca.verifier.app.decoder.model.VerificationResult
 import java.time.ZonedDateTime
+import java.util.*
 
 data class GreenCertificateData(
     val issuingCountry: String?,
     val hcertJson: String,
     val greenCertificate: GreenCertificate,
     val issuedAt: ZonedDateTime,
     val expirationTime: ZonedDateTime
-)
+) {
+    fun getNormalizedIssuingCountry(): String =
+        (if (this.issuingCountry?.isNotBlank() == true) this.issuingCountry else this.greenCertificate.getIssuingCountry()).toLowerCase(
+            Locale.ROOT
+        )
+}
 
 /**
  * Decodes input as a CBOR structure