Updated on 2026-08-14

app/src/main/java/com/tangem/tap/domain/walletconnect/BnbHelper.kt

@@ -12,69 +12,65 @@ import com.trustwallet.walletconnect.models.binance.WCBinanceTransferOrder
 import com.trustwallet.walletconnect.models.binance.tradeOrderSerializer
 import timber.log.Timber
 
-class BnbHelper {
-    companion object {
+object BnbHelper {
+    fun createMessageData(order: WCBinanceTransferOrder): BinanceMessageData.Transfer {
+        val input = order.msgs.first().inputs.first()
+        val output = order.msgs.first().inputs.first()
 
-        fun createMessageData(order: WCBinanceTransferOrder): BinanceMessageData.Transfer {
-            val input = order.msgs.first().inputs.first()
-            val output = order.msgs.first().inputs.first()
+        val currency =
+            input.coins.firstOrNull()?.denom ?: Blockchain.Binance
+        val amount = input.coins
+            .mapNotNull { if (it.denom == currency) it.amount else null }
+            .sum()
+            .toBigDecimal()
+            .movePointLeft(Blockchain.Binance.decimals())
+            .stripZeroPlainString()
 
-            val currency =
-                input.coins.firstOrNull()?.denom ?: Blockchain.Binance
-            val amount = input.coins
-                .mapNotNull { if (it.denom == currency) it.amount else null }
-                .sum()
-                .toBigDecimal()
-                .movePointLeft(Blockchain.Binance.decimals())
-                .stripZeroPlainString()
-
-            val gson = GsonBuilder()
-                .registerTypeAdapter(tradeOrderSerializer)
-                .serializeNulls()
-                .create()
-
-            return BinanceMessageData.Transfer(
-                outputAddress = output.address,
-                amount = amount,
-                address = input.address,
-                data = gson.toJson(order).toByteArray().calculateSha256()
-            )
-        }
-
-        fun createMessageData(order: WCBinanceTradeOrder): BinanceMessageData.Trade {
-            val address = order.msgs.first().sender
-
-            val tradeData = order.msgs.map {
-                val price = it.price.toBigDecimal()
-                    .movePointLeft(Blockchain.Binance.decimals())
-                    .stripTrailingZeros()
-                val quantity = it.quantity.toBigDecimal()
-                    .movePointLeft(Blockchain.Binance.decimals())
-                    .stripTrailingZeros()
-
-                val amount = price * quantity
-                val symbol = it.symbol.substringBefore("-")
-
-                TradeData(
-                    price = "$price ${Blockchain.Binance.currency}",
-                    quantity = "$quantity $symbol",
-                    amount = "$amount ${Blockchain.Binance.currency}",
-                    symbol = symbol
-                )
-            }
-            val gson = GsonBuilder()
-                .registerTypeAdapter(tradeOrderSerializer)
-                .serializeNulls()
-                .create()
-            val serialized = gson.toJson(order)
-            Timber.d(serialized)
-
-            return BinanceMessageData.Trade(
-                tradeData = tradeData,
-                address = address,
-                data = serialized.toByteArray().calculateSha256()
-            )
-        }
+        val gson = GsonBuilder()
+            .registerTypeAdapter(tradeOrderSerializer)
+            .serializeNulls()
+            .create()
 
+        return BinanceMessageData.Transfer(
+            outputAddress = output.address,
+            amount = amount,
+            address = input.address,
+            data = gson.toJson(order).toByteArray().calculateSha256(),
+        )
     }
-}
+
+    fun createMessageData(order: WCBinanceTradeOrder): BinanceMessageData.Trade {
+        val address = order.msgs.first().sender
+
+        val tradeData = order.msgs.map {
+            val price = it.price.toBigDecimal()
+                .movePointLeft(Blockchain.Binance.decimals())
+                .stripTrailingZeros()
+            val quantity = it.quantity.toBigDecimal()
+                .movePointLeft(Blockchain.Binance.decimals())
+                .stripTrailingZeros()
+
+            val amount = price * quantity
+            val symbol = it.symbol.substringBefore("-")
+
+            TradeData(
+                price = "$price ${Blockchain.Binance.currency}",
+                quantity = "$quantity $symbol",
+                amount = "$amount ${Blockchain.Binance.currency}",
+                symbol = symbol,
+            )
+        }
+        val gson = GsonBuilder()
+            .registerTypeAdapter(tradeOrderSerializer)
+            .serializeNulls()
+            .create()
+        val serialized = gson.toJson(order)
+        Timber.d(serialized)
+
+        return BinanceMessageData.Trade(
+            tradeData = tradeData,
+            address = address,
+            data = serialized.toByteArray().calculateSha256(),
+        )
+    }
+}

app/src/main/java/com/tangem/tap/domain/walletconnect/EthSignHelper.kt

@@ -9,50 +9,28 @@ import com.google.gson.JsonParser
 import com.google.gson.annotations.SerializedName
 import com.tangem.blockchain.common.Blockchain
 import com.trustwallet.walletconnect.JSONRPC_VERSION
-import com.trustwallet.walletconnect.models.ethereum.WCEthereumSignMessage
 
-class EthSignHelper {
-    companion object {
-        private val gson: Gson by lazy {
-            GsonBuilder()
-                .setPrettyPrinting()
-                .serializeNulls()
-                .create()
-        }
+object EthSignHelper {
+    private val gson: Gson by lazy {
+        GsonBuilder()
+            .setPrettyPrinting()
+            .serializeNulls()
+            .create()
+    }
 
-        fun parseCustomRequest(data: String): CustomJsonRpcRequest {
-            return gson.fromJson<CustomJsonRpcRequest>(data)
-        }
-
-        fun tryToParseEthTypedMessage(request: CustomJsonRpcRequest): WCEthereumSignMessage? {
-            return if (request.method == WCMethodExtended.ETH_SIGN_TYPE_DATA_V4) {
-                WCEthereumSignMessage(
-                    listOf(
-                        request.params[0].asString,
-                        request.params[1].asString,
-                    ),
-                    WCEthereumSignMessage.WCSignType.TYPED_MESSAGE
-                )
-            } else {
-                null
-            }
-        }
-
-        fun tryToParseEthTypedMessageString(message: String): String? {
-            return try {
-                val messageString = message
-                    .replace("\\", "")
-                    .removePrefix("\"")
-                    .removeSuffix("\"")
-                val messageJson = JsonParser().parse(messageString)
-                val filteredMap = gson.fromJson<Map<*,*>>(messageJson)
-                    .filterKeys { it == "domain" || it == "message"}
-
-                gson.toJson(filteredMap)
-            } catch (exception: Exception) {
-                null
-            }
+    fun tryToParseEthTypedMessageString(message: String): String? {
+        return try {
+            val messageString = message
+                .replace("\\", "")
+                .removePrefix("\"")
+                .removeSuffix("\"")
+            val messageJson = JsonParser().parse(messageString)
+            val filteredMap = gson.fromJson<Map<*, *>>(messageJson)
+                .filterKeys { it == "domain" || it == "message" }
 
+            gson.toJson(filteredMap)
+        } catch (exception: Exception) {
+            null
         }
     }
 }
@@ -61,7 +39,7 @@ data class CustomJsonRpcRequest(
     val id: Long,
     val jsonrpc: String = JSONRPC_VERSION,
     val method: WCMethodExtended?,
-    val params: JsonArray
+    val params: JsonArray,
 ) {
 
     fun blockchainFromChainId(): Blockchain? {

app/src/main/java/com/tangem/tap/domain/walletconnect/WalletConnectManager.kt

@@ -3,8 +3,8 @@ package com.tangem.tap.domain.walletconnect
 import com.tangem.blockchain.common.Blockchain
 import com.tangem.common.card.EllipticCurve
 import com.tangem.common.extensions.guard
-import com.tangem.domain.common.ScanResponse
 import com.tangem.core.analytics.Analytics
+import com.tangem.domain.common.ScanResponse
 import com.tangem.tap.common.analytics.events.WalletConnect
 import com.tangem.tap.common.extensions.dispatchOnMain
 import com.tangem.tap.common.redux.global.GlobalAction
@@ -43,6 +43,7 @@ import java.util.*
 import java.util.concurrent.TimeUnit
 import kotlin.collections.set
 
+@Suppress("LargeClass")
 class WalletConnectManager {
 
     private var cardId: String? = null
@@ -126,6 +127,7 @@ class WalletConnectManager {
         }
     }
 
+    @Suppress("MagicNumber")
     private fun setupConnectionTimeoutCheck(session: WCSession) {
         scope.launch {
             delay(20_000)
@@ -345,6 +347,7 @@ class WalletConnectManager {
         }
     }
 
+    @Suppress("LongMethod", "ComplexMethod")
     fun setListeners(client: WCClient) {
         client.onSessionRequest = { id: Long, peer: WCPeerMeta ->
             Timber.d("OnSessionRequest: $peer")
@@ -490,12 +493,11 @@ class WalletConnectManager {
     }
 
     companion object {
-        private val tangemPeerMeta =
-            WCPeerMeta(name = "Tangem Wallet", url = "https://tangem.com")
+        const val WC_SCHEME = "wc"
+
+        private val tangemPeerMeta = WCPeerMeta(name = "Tangem Wallet", url = "https://tangem.com")
 
         fun isCorrectWcUri(string: String): Boolean = WCSession.from(string) != null
-
-        const val WC_SCHEME = "wc"
     }
 }
 
@@ -521,6 +523,7 @@ data class WalletConnectActiveData(
     }
 }
 
+@Suppress("MagicNumber")
 class RetryInterceptor : Interceptor {
     override fun intercept(chain: Interceptor.Chain): Response {
         val request: Request = chain.request()

app/src/main/java/com/tangem/tap/domain/walletconnect/WalletConnectNetworkUtils.kt

@@ -3,46 +3,39 @@ package com.tangem.tap.domain.walletconnect
 import com.tangem.blockchain.common.Blockchain
 import com.trustwallet.walletconnect.models.WCPeerMeta
 
-class WalletConnectNetworkUtils {
-
-    companion object {
-
-        fun parseBlockchain(
-            chainId: Int?,
-            peer: WCPeerMeta,
-        ): Blockchain? {
-            return when {
-                peer.url.contains("pancakeswap.finance") -> {
-                    Blockchain.BSC
-                }
-                peer.url.contains("optimism") -> {
-                    Blockchain.Optimism
-                }
-                chainId != null -> {
-                    Blockchain.fromChainId(chainId)
-                }
-                peer.url.contains("matic.network") || peer.name == "Polygon" -> {
-                    Blockchain.Polygon
-                }
-                peer.url.contains("binance.org") || peer.name.contains("Binance") -> {
-                    if (peer.icons.firstOrNull()?.contains("testnet") == true) {
-                        Blockchain.BinanceTestnet
-                    } else {
-                        Blockchain.Binance
-                    }
-                }
-                peer.name.contains("BSC") -> {
-                    Blockchain.BSC
-                }
-                peer.url.contains("honeyswap.1hive.eth.limo") -> {
-                    // Check if something's changed after this bug report:
-                    // https://github.com/1Hive/honeyswap-interface/issues/83
-                    Blockchain.Gnosis
-                }
-                else -> {
-                    Blockchain.Ethereum
+object WalletConnectNetworkUtils {
+    fun parseBlockchain(chainId: Int?, peer: WCPeerMeta): Blockchain? {
+        return when {
+            peer.url.contains("pancakeswap.finance") -> {
+                Blockchain.BSC
+            }
+            peer.url.contains("optimism") -> {
+                Blockchain.Optimism
+            }
+            chainId != null -> {
+                Blockchain.fromChainId(chainId)
+            }
+            peer.url.contains("matic.network") || peer.name == "Polygon" -> {
+                Blockchain.Polygon
+            }
+            peer.url.contains("binance.org") || peer.name.contains("Binance") -> {
+                if (peer.icons.firstOrNull()?.contains("testnet") == true) {
+                    Blockchain.BinanceTestnet
+                } else {
+                    Blockchain.Binance
                 }
             }
+            peer.name.contains("BSC") -> {
+                Blockchain.BSC
+            }
+            peer.url.contains("honeyswap.1hive.eth.limo") -> {
+                // Check if something's changed after this bug report:
+                // https://github.com/1Hive/honeyswap-interface/issues/83
+                Blockchain.Gnosis
+            }
+            else -> {
+                Blockchain.Ethereum
+            }
         }
     }
 }

app/src/main/java/com/tangem/tap/domain/walletconnect/WalletConnectSdkHelper.kt

@@ -22,9 +22,9 @@ import com.tangem.common.core.TangemSdkError
 import com.tangem.common.extensions.hexToBytes
 import com.tangem.common.extensions.toDecompressedPublicKey
 import com.tangem.common.extensions.toHexString
+import com.tangem.core.analytics.Analytics
 import com.tangem.crypto.CryptoUtils
 import com.tangem.operations.sign.SignHashCommand
-import com.tangem.core.analytics.Analytics
 import com.tangem.tap.common.analytics.events.WalletConnect
 import com.tangem.tap.common.extensions.safeUpdate
 import com.tangem.tap.common.extensions.toFormattedString
@@ -48,6 +48,7 @@ import java.math.BigDecimal
 
 class WalletConnectSdkHelper {
 
+    @Suppress("MagicNumber")
     suspend fun prepareTransactionData(
         transaction: WCEthereumTransaction,
         session: WalletConnectSession,
@@ -101,7 +102,7 @@ class WalletConnectSdkHelper {
             gasAmount = fee.toFormattedString(decimals),
             totalAmount = total.toFormattedString(decimals),
             balance = balance.toFormattedString(decimals),
-            isEnoughFundsToSend = (balance - total) >= BigDecimal.ZERO,
+            isEnoughFundsToSend = balance - total >= BigDecimal.ZERO,
             session = session.session,
             id = id,
             type = type,