Updated on 2026-08-14

domain/card/src/main/kotlin/com/tangem/domain/card/BackupValidator.kt

@@ -0,0 +1,46 @@
+package com.tangem.domain.card
+
+import com.tangem.common.card.EllipticCurve
+import com.tangem.domain.card.configs.CardConfig
+import com.tangem.domain.models.scan.CardDTO
+
+object BackupValidator {
+
+    fun isValidFull(cardDTO: CardDTO): Boolean {
+        return validateBackupStatus(cardDTO) && validateCurves(cardDTO)
+    }
+
+    fun isValidBackupStatus(cardDTO: CardDTO): Boolean {
+        return validateBackupStatus(cardDTO)
+    }
+
+    private fun validateCurves(cardDTO: CardDTO): Boolean {
+        val config = CardConfig.createConfig(cardDTO)
+        // / Since the curve `bls12381_G2_AUG` was added later into first generation of wallets,
+        // we cannot determine whether this curve is missing due to an error or because the user
+        // did not want to recreate the wallet.
+        val expectedCurves = config.mandatoryCurves
+            .filterNot { it == EllipticCurve.Bls12381G2Aug }
+        val curves = cardDTO.wallets.map { it.curve }
+        for (expectedCurve in expectedCurves) {
+            val cardCurvesCount = curves.count { it == expectedCurve }
+
+            // missing curve
+            if (cardCurvesCount == 0) {
+                return false
+            }
+
+            // duplicated curve
+            if (cardCurvesCount > 1) {
+                return false
+            }
+        }
+        return true
+    }
+
+    private fun validateBackupStatus(cardDTO: CardDTO): Boolean {
+        val backupStatus = cardDTO.backupStatus
+        backupStatus ?: return true // for card with null backup status, validation should always returns true
+        return backupStatus !is CardDTO.BackupStatus.CardLinked
+    }
+}