Updated on 2026-08-14

app/src/main/java/com/tangem/wallet/BalanceValidator.java

@@ -0,0 +1,115 @@
+package com.tangem.wallet;
+
+import com.tangem.App;
+import com.tangem.card_common.data.TangemCard;
+
+public class BalanceValidator {
+    private String firstLine;
+    private String secondLine;
+    private int score;
+    private boolean hasPending;
+
+    public String getFirstLine() {
+        return firstLine;
+    }
+
+    public void setFirstLine(String value) {
+        firstLine = value;
+    }
+
+    public String getSecondLine(Boolean recommend) {
+        if (!recommend) return secondLine;
+        if (score > 89) {
+            return "Safe to accept. " + secondLine;
+        } else if (score > 74) {
+            return "Not fully safe to accept. " + secondLine;
+        } else if (score > 30) {
+            return "Not safe to accept. " + secondLine;
+        } else {
+            return "Do not accept! " + secondLine;
+        }
+    }
+
+    public void setSecondLine(String value) {
+        secondLine = value;
+    }
+
+    public void setScore(int score) {
+        this.score = score;
+    }
+
+    public int getColor() {
+        if( hasPending )
+        {
+            return R.color.primary_dark;
+        }
+        if (score > 89) {
+            return R.color.confirmed;
+        } else if (score > 74) {
+            return android.R.color.holo_orange_light;
+        } else if (score > 0) {
+            return android.R.color.holo_orange_dark;
+        } else {
+            return android.R.color.holo_red_light;
+        }
+    }
+
+    public void check(TangemContext ctx, Boolean attest) {
+        firstLine = "Verification failed";
+        secondLine = "";
+        TangemCard card = ctx.getCard();
+        CoinEngine engine = CoinEngineFactory.INSTANCE.create(ctx);
+
+        if (!engine.validateBalance(this)) return;
+
+        hasPending=App.pendingTransactionsStorage.hasTransactions(card);
+
+        if( hasPending )
+        {
+            firstLine = "Pending transaction...";
+            secondLine = "Swipe down to refresh";
+            return;
+        }
+
+        // Verify card?
+        if (attest) {
+
+            if (!card.isWalletPublicKeyValid()) {
+                score = 0;
+                firstLine = "Verification failed";
+                secondLine = "Wallet verification failed. Tap again.";
+                return;
+            }
+
+            if (card.isOnlineVerified() != null && !card.isOnlineVerified()) {
+                score = 0;
+                firstLine = "Not genuine banknote";
+                secondLine = "Tangem Attestation service says the banknote is not genuine.";
+                return;
+            }
+
+            if (card.isCodeConfirmed() != null && !card.isCodeConfirmed()) {
+                score = 0;
+                firstLine = "Not genuine banknote";
+                secondLine = "Firmware binary code verification failed";
+                return;
+            }
+
+            if (card.PIN2 == TangemCard.PIN2_Mode.CustomPIN2) {
+                score = 0;
+                firstLine = "Locked with PIN2";
+                secondLine = "Ask the holder to disable PIN2 before accepting";
+                return;
+            }
+
+            // rule 2.b
+            if (card.isOnlineVerified()) {
+                secondLine += "Verified note identity. ";
+            } else {
+                score = 80;
+                secondLine += "Card identity was not verified. Cannot reach Tangem attestation service. ";
+            }
+        }
+    }
+
+}