Updated on 2026-08-14

domain/card/.gitignore

@@ -0,0 +1 @@
+/build

domain/card/build.gradle.kts

@@ -0,0 +1,18 @@
+plugins {
+    alias(deps.plugins.kotlin.jvm)
+    alias(deps.plugins.kotlin.kapt)
+    id("configuration")
+}
+
+dependencies {
+    implementation(project(":domain:core"))
+    // TODO: Remove after new card scan result was implemented
+    implementation(project(":domain:models"))
+
+    implementation(deps.tangem.card.core)
+
+    implementation(deps.hilt.core)
+    kapt(deps.hilt.kapt)
+
+    implementation(deps.moshi.kotlin)
+}

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

@@ -0,0 +1,14 @@
+package com.tangem.domain.card
+
+import com.tangem.common.core.TangemSdkError
+
+// TODO: May be add new error types
+sealed class ScanCardException : Exception() {
+    object WrongCardId : ScanCardException()
+
+    object UserCancelled : ScanCardException()
+
+    open class ChainException : ScanCardException()
+
+    class SdkException(override val cause: TangemSdkError) : ScanCardException()
+}

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

@@ -0,0 +1,76 @@
+package com.tangem.domain.card
+
+import arrow.core.EitherNel
+import arrow.core.flatMap
+import arrow.core.toEitherNel
+import com.tangem.TangemSdk
+import com.tangem.common.core.CardIdDisplayFormat
+import com.tangem.domain.card.model.ScanCardParams
+import com.tangem.domain.card.repository.ScanCardRepository
+import com.tangem.domain.core.chain.ChainProcessor
+import com.tangem.domain.models.scan.ProductType
+import com.tangem.domain.models.scan.ScanResponse
+import javax.inject.Inject
+
+/**
+ * Use case responsible for scanning a card and returning a [ScanResponse] object.
+ * @property scanCardRepository A repository object implementing [ScanCardRepository] interface.
+ * @property tangemSdk An instance of [TangemSdk] to configure the display format of the card ID.
+ * @constructor Create a new instance of [ScanCardUseCase] with the given dependencies.
+ */
+class ScanCardUseCase @Inject internal constructor(
+    private val scanCardRepository: ScanCardRepository,
+    private val tangemSdk: TangemSdk,
+) {
+
+    /**
+     * A [ChainProcessor] object to launch the after-scan chains.
+     */
+    private val scanChainProcessor by lazy {
+        ChainProcessor<ScanCardException.ChainException, ScanResponse>()
+    }
+
+    /**
+     * Scan a card and return a [ScanResponse] object.
+     * @param params An instance of [ScanCardParams] to configure the scan process.
+     * @return A [EitherNel] object with either a non-empty list of [ScanCardException] or a [ScanResponse].
+     */
+    suspend operator fun invoke(params: ScanCardParams = ScanCardParams()): EitherNel<ScanCardException, ScanResponse> {
+        resetCardIdDisplayFormat()
+        scanChainProcessor.addChains(*params.afterScanChains)
+
+        return scanCardRepository.scanCard(
+            cardId = params.cardId,
+            allowRequestAccessCodeFromRepository = params.allowRequestAccessCodeFromRepository,
+        )
+            .onRight { scanResponse ->
+                updateCardIdDisplayFormat(scanResponse.productType)
+            }
+            .toEitherNel()
+            .flatMap { scanResponse ->
+                scanChainProcessor.launchChains(initial = scanResponse)
+            }
+    }
+
+    /**
+     * Reset the card ID display format to [CardIdDisplayFormat.Full].
+     */
+    private fun resetCardIdDisplayFormat() {
+        tangemSdk.config.cardIdDisplayFormat = CardIdDisplayFormat.Full
+    }
+
+    /**
+     * Update the card ID display format according to the [ProductType] of the scanned card.
+     * @param productType The [ProductType] of the scanned card.
+     */
+    private fun updateCardIdDisplayFormat(productType: ProductType) {
+        tangemSdk.config.cardIdDisplayFormat = when (productType) {
+            ProductType.Twins -> CardIdDisplayFormat.LastLuhn(numbers = 4)
+            ProductType.SaltPay -> CardIdDisplayFormat.None
+            ProductType.Note,
+            ProductType.Wallet,
+            ProductType.Start2Coin,
+            -> CardIdDisplayFormat.Full
+        }
+    }
+}

domain/card/src/main/kotlin/com/tangem/domain/card/di/CardDomainModule.kt

@@ -0,0 +1,18 @@
+package com.tangem.domain.card.di
+
+import com.tangem.TangemSdk
+import com.tangem.domain.card.ScanCardUseCase
+import com.tangem.domain.card.repository.ScanCardRepository
+import dagger.Module
+import dagger.Provides
+import dagger.hilt.InstallIn
+import dagger.hilt.components.SingletonComponent
+
+@Module
+@InstallIn(SingletonComponent::class)
+class CardDomainModule {
+
+    @Provides
+    fun provideScanCardUseCase(scanCardRepository: ScanCardRepository, tangemSdk: TangemSdk) =
+        ScanCardUseCase(scanCardRepository, tangemSdk)
+}

domain/card/src/main/kotlin/com/tangem/domain/card/model/ScanCardParams.kt

@@ -0,0 +1,21 @@
+package com.tangem.domain.card.model
+
+import com.tangem.domain.card.ScanCardException
+import com.tangem.domain.core.chain.Chain
+import com.tangem.domain.models.scan.ScanResponse
+
+/**
+ * Represents the parameters to be used during a card scanning operation.
+ *
+ * @property cardId an optional card ID to scan. If null, can scan any card present.
+ * Defaults to null.
+ * @property allowRequestAccessCodeFromRepository whether to prompt the user for an access code if needed.
+ * Defaults to false.
+ * @property afterScanChains An array of chains that should be executed after a successful card scan operation.
+ * Defaults to an empty array.
+ */
+class ScanCardParams(
+    val cardId: String? = null,
+    val allowRequestAccessCodeFromRepository: Boolean = false,
+    val afterScanChains: Array<out Chain<ScanCardException.ChainException, ScanResponse>> = emptyArray(),
+)

domain/card/src/main/kotlin/com/tangem/domain/card/repository/ScanCardRepository.kt

@@ -0,0 +1,24 @@
+package com.tangem.domain.card.repository
+
+import arrow.core.Either
+import com.tangem.domain.card.ScanCardException
+import com.tangem.domain.models.scan.ScanResponse
+
+/**
+ * A repository for scanning a card.
+ */
+interface ScanCardRepository {
+
+    /**
+     * Scans the card with the given [cardId] and returns a [ScanResponse]. If [allowRequestAccessCodeFromRepository]
+     * is true, the repository may prompt the user for an access code.
+     *
+     * @param cardId an optional card ID to scan. If null, the repository should scan any card present.
+     * @param allowRequestAccessCodeFromRepository whether to prompt the user for an access code if needed.
+     * @return an [Either] that contains a [ScanCardException] in case of an error or a [ScanResponse].
+     */
+    suspend fun scanCard(
+        cardId: String?,
+        allowRequestAccessCodeFromRepository: Boolean,
+    ): Either<ScanCardException, ScanResponse>
+}

domain/core/src/main/kotlin/com/tangem/domain/core/chain/Chain.kt

@@ -1,7 +1,19 @@
 package com.tangem.domain.core.chain
 
 import arrow.core.Either
+import arrow.core.EitherNel
 
+/**
+ * A chain in the [ChainProcessor] class for processing a chain of operations with the ability to handle errors.
+ * @param E the type of error
+ * @param R the type of result
+ */
 interface Chain<E, R> {
-    suspend operator fun invoke(previousChainResult: Either<E, R>): Either<E, R>
+
+    /**
+     * Invokes the chain with the previous chain result as input and returns an [Either] result.
+     * @param previousChainResult the previous chain result as an [EitherNel]
+     * @return the result of the chain processing as an [Either]
+     */
+    suspend operator fun invoke(previousChainResult: EitherNel<E, R>): Either<E, R>
 }

domain/core/src/main/kotlin/com/tangem/domain/core/chain/ChainProcessor.kt

@@ -1,28 +1,63 @@
 package com.tangem.domain.core.chain
 
 import arrow.core.Either
+import arrow.core.EitherNel
+import arrow.core.left
+import arrow.core.nel
+import arrow.core.right
+import arrow.core.toEitherNel
 
+/**
+ * A class for processing a chain of operations with the ability to handle errors.
+ * @param E the type of error
+ * @param R the type of result
+ */
 class ChainProcessor<E, R> {
+
+    /**
+     * The list of chains to be executed in order.
+     */
     private val chains: MutableList<Chain<E, R>> = mutableListOf()
 
+    /**
+     * Adds chains to the existing list of chains to be executed.
+     * @param chains the chains to be added to the list
+     */
     fun addChains(vararg chains: Chain<E, R>) {
         this.chains.addAll(chains)
     }
 
-    suspend fun launchChains(initial: R, returnOnFirstError: Boolean = true): Either<E, R> {
+    /**
-        return launchChains(initial = Either.Right(initial), returnOnFirstError)
+     * Launches the chains with the given initial value as input.
-    }
+     * @param initial the initial value to start the chain processing.
-
+     * @param accumulateExceptions determines whether to accumulate exceptions or break on first exception.
-    private suspend fun launchChains(initial: Either<E, R>, returnOnFirstError: Boolean = true): Either<E, R> {
+     * Defaults to true.
-        var result = initial
+     * @return the result of the chain processing as an EitherNel, which is a disjunction that may contain multiple errors.
-
+     */
-        chains.forEach { chain ->
+    private suspend fun launchChains(initial: Either<E, R>, accumulateExceptions: Boolean = true): EitherNel<E, R> {
-            result = chain(result)
+        return chains.fold(initial.toEitherNel()) { previousChainResult, chain ->
-                .onRight {
+            chain.invoke(previousChainResult)
-                    if (returnOnFirstError) return result
+                .mapLeft { e ->
+                    previousChainResult.leftOrNull()?.plus(e)
+                        ?: e.nel()
+                }
+                .onLeft { e ->
+                    if (!accumulateExceptions) {
+                        return e.left()
+                    }
                 }
         }
+    }
 
-        return result
+    /**
+     * Launches the chains with the given initial value as input.
+     * This function is a convenience function that assumes the initial value does not contain any errors.
+     * @param initial the initial value to start the chain processing.
+     * @param accumulateExceptions determines whether to accumulate exceptions or break on first exception.
+     * Defaults to true.
+     * @return the result of the chain processing as an EitherNel, which is a disjunction that may contain multiple errors.
+     */
+    suspend fun launchChains(initial: R, accumulateExceptions: Boolean = true): EitherNel<E, R> {
+        return launchChains(initial.right(), accumulateExceptions)
     }
 }

settings.gradle.kts

@@ -64,4 +64,5 @@ include(":domain:models")
 include(":domain:legacy")
 
 include(":domain:core")
+include(":domain:card")
 // endregion Domain modules