Feature/app checkout

CHANGELOG.md

@@ -7,6 +7,7 @@ to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## Next Release
 
+- Add checkout to app, lock mechanism to server and change server api to accept bulk requests [#86](https://github.com/cryptimeleon/incentive-system/pull/86)
 - Extract client-side pseudorandomness and include promotionId to PRF input [#76](https://github.com/cryptimeleon/incentive-system/pull/76)
 - Add streak and VIP promotion, polishing of the promotion api [71](https://github.com/cryptimeleon/incentive-system/pull/71)
 - Integrate promotions to app, ui updates, and project refactoring [#70](https://github.com/cryptimeleon/incentive-system/pull/70)

android/app/build.gradle

@@ -5,6 +5,7 @@ plugins {
     id 'kotlin-kapt' // Without this databinding does not work correctly
     id 'dagger.hilt.android.plugin'
     id 'kotlin-parcelize'
+    id 'org.jetbrains.kotlin.plugin.serialization' version "$kotlin_version"
 }
 
 
@@ -77,6 +78,10 @@ dependencies {
     implementation "androidx.navigation:navigation-fragment-ktx:$nav_version"
     implementation "androidx.navigation:navigation-ui-ktx:$nav_version"
 
+    // Nice kotlin serialization with polymorphism
+    implementation "org.jetbrains.kotlinx:kotlinx-serialization-core:1.3.2"
+    implementation "org.jetbrains.kotlinx:kotlinx-serialization-json:1.3.2"
+
     // Support for activityViewModel to allow shared view models
     implementation "androidx.activity:activity-ktx:$activity_version"
     implementation "androidx.fragment:fragment-ktx:$fragment_version"

android/app/src/main/java/org/cryptimeleon/incentive/app/NavGraph.kt

@@ -15,7 +15,9 @@ import androidx.navigation.compose.NavHost
 import androidx.navigation.compose.composable
 import org.cryptimeleon.incentive.app.ui.basket.BasketUi
 import org.cryptimeleon.incentive.app.ui.benchmark.BenchmarkUi
+import org.cryptimeleon.incentive.app.ui.checkout.CheckoutUi
 import org.cryptimeleon.incentive.app.ui.dashboard.Dashboard
+import org.cryptimeleon.incentive.app.ui.rewards.RewardsUi
 import org.cryptimeleon.incentive.app.ui.scan.ScanScreen
 import org.cryptimeleon.incentive.app.ui.settings.Settings
 import org.cryptimeleon.incentive.app.ui.setup.SetupUi
@@ -25,6 +27,8 @@ object MainDestination {
     const val DASHBOARD_ROUTE = "dashboard"
     const val SCANNER_ROUTE = "scanner"
     const val BASKET_ROUTE = "basket"
+    const val REWARDS_ROUTE = "rewards"
+    const val CHECKOUT_ROUTE = "checkout"
     const val SETTINGS_ROUTE = "settings"
     const val BENCHMARK_ROUTE = "benchmark"
 }
@@ -75,9 +79,16 @@ fun NavGraph(
         composable(MainDestination.BASKET_ROUTE) {
             BasketUi(
                 actions.openSettings,
-                actions.openBenchmark
+                actions.openBenchmark,
+                actions.openRewards
             )
         }
+        composable(MainDestination.REWARDS_ROUTE) {
+            RewardsUi(actions.openCheckout)
+        }
+        composable(MainDestination.CHECKOUT_ROUTE) {
+            CheckoutUi(actions.navigateToDashboard)
+        }
         composable(MainDestination.SETTINGS_ROUTE) { Settings(actions.onExitSettings) }
         composable(MainDestination.BENCHMARK_ROUTE) { BenchmarkUi(actions.onExitBenchmark) }
     }
@@ -103,6 +114,18 @@ class MainActions(navController: NavHostController) {
     val openBenchmark: () -> Unit = {
         navController.navigate(MainDestination.BENCHMARK_ROUTE)
     }
+
+    val openCheckout: () -> Unit = {
+        navController.navigate(MainDestination.CHECKOUT_ROUTE)
+    }
+
+    val openRewards: () -> Unit = {
+        navController.navigate(MainDestination.REWARDS_ROUTE)
+    }
+
+    val navigateToDashboard: () -> Unit = {
+        navController.navigate(MainDestination.DASHBOARD_ROUTE)
+    }
 }
 
 /**

android/app/src/main/java/org/cryptimeleon/incentive/app/data/BasketRepository.kt

@@ -8,12 +8,12 @@ import org.cryptimeleon.incentive.app.data.database.basket.BasketItemEntity
 import org.cryptimeleon.incentive.app.data.database.basket.ShoppingItemEntity
 import org.cryptimeleon.incentive.app.data.network.BasketApiService
 import org.cryptimeleon.incentive.app.data.network.NetworkBasketItem
-import org.cryptimeleon.incentive.app.data.network.NetworkPayBody
 import org.cryptimeleon.incentive.app.data.network.NetworkShoppingItem
 import org.cryptimeleon.incentive.app.domain.IBasketRepository
 import org.cryptimeleon.incentive.app.domain.model.Basket
 import org.cryptimeleon.incentive.app.domain.model.BasketItem
 import org.cryptimeleon.incentive.app.domain.model.ShoppingItem
+import timber.log.Timber
 
 class BasketRepository(
     private val basketApiService: BasketApiService,
@@ -134,20 +134,18 @@ class BasketRepository(
         if (basket != null) {
             basketApiService.deleteBasket(basket.basketId)
         }
+        basketDao.deleteAllBasketItems()
         return createNewBasket()
     }
 
-    override suspend fun payCurrentBasket(): Boolean {
-        val basket = basket.first() ?: return false
+    override suspend fun payCurrentBasket() {
+        val basket = basket.first()
 
         // Pay basket
         val payResponse =
-            basketApiService.payBasket(NetworkPayBody(basket.basketId, basket.value))
-        return if (payResponse.isSuccessful) {
-            discardCurrentBasket()
-            true
-        } else {
-            false
+            basketApiService.payBasket(basket!!.basketId)
+        if (!payResponse.isSuccessful) {
+            Timber.e(payResponse.raw().toString())
         }
     }
 

android/app/src/main/java/org/cryptimeleon/incentive/app/data/CryptoRepository.kt

@@ -5,13 +5,14 @@ import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.flow.flowOn
 import kotlinx.coroutines.flow.map
-import org.cryptimeleon.craco.sig.sps.eq.SPSEQSignature
 import org.cryptimeleon.incentive.app.data.database.crypto.CryptoDao
 import org.cryptimeleon.incentive.app.data.database.crypto.CryptoMaterialEntity
 import org.cryptimeleon.incentive.app.data.database.crypto.CryptoTokenEntity
 import org.cryptimeleon.incentive.app.data.network.CryptoApiService
 import org.cryptimeleon.incentive.app.data.network.InfoApiService
 import org.cryptimeleon.incentive.app.domain.ICryptoRepository
+import org.cryptimeleon.incentive.app.domain.model.BulkRequestDto
+import org.cryptimeleon.incentive.app.domain.model.BulkResponseDto
 import org.cryptimeleon.incentive.app.domain.model.CryptoMaterial
 import org.cryptimeleon.incentive.crypto.IncentiveSystem
 import org.cryptimeleon.incentive.crypto.model.IncentivePublicParameters
@@ -23,9 +24,7 @@ import org.cryptimeleon.incentive.crypto.model.keys.user.UserPublicKey
 import org.cryptimeleon.incentive.crypto.model.keys.user.UserSecretKey
 import org.cryptimeleon.incentive.crypto.model.messages.JoinResponse
 import org.cryptimeleon.math.serialization.converter.JSONConverter
-import org.cryptimeleon.math.structures.cartesian.Vector
 import timber.log.Timber
-import java.math.BigInteger
 import java.util.*
 
 /**
@@ -62,17 +61,18 @@ class CryptoRepository(
         val userKeyPair = cryptoMaterial.ukp
         val incentiveSystem = IncentiveSystem(pp)
 
-        val joinRequest = incentiveSystem.generateJoinRequest(providerPublicKey, userKeyPair, promotionParameters)
+        val joinRequest =
+            incentiveSystem.generateJoinRequest(providerPublicKey, userKeyPair, promotionParameters)
         val joinResponse = cryptoApiService.runIssueJoin(
             jsonConverter.serialize(joinRequest.representation),
             promotionParameters.promotionId.toString(),
             jsonConverter.serialize(userKeyPair.pk.representation)
         )
 
         if (!joinResponse.isSuccessful) {
+            Timber.e(joinResponse.raw().toString())
             throw RuntimeException(
-                "Join Response not successful: " + joinResponse.code() + "\n" + joinResponse.errorBody()!!
-                    .string()
+                "Join not successful"
             )
         }
 
@@ -89,45 +89,33 @@ class CryptoRepository(
         }
     }
 
-    override suspend fun runCreditEarn(
+    override suspend fun sendTokenUpdatesBatch(
         basketId: UUID,
-        promotionParameters: PromotionParameters,
-        basketValue: Int
+        bulkRequestDto: BulkRequestDto
     ) {
-        val cryptoMaterial = cryptoMaterial.first()!!
-        val token = tokens.first().find { it.promotionId == promotionParameters.promotionId }
-        val pp = cryptoMaterial.pp
-        val providerPublicKey = cryptoMaterial.ppk
-        val userKeyPair = cryptoMaterial.ukp
-        val incentiveSystem = IncentiveSystem(pp)
-
-        val earnRequest =
-            incentiveSystem.generateEarnRequest(token, providerPublicKey, userKeyPair)
-        val earnResponse = cryptoApiService.runCreditEarn(
-            basketId,
-            promotionParameters.promotionId.toInt(),
-            jsonConverter.serialize(earnRequest.representation)
-        )
+        val response = cryptoApiService.sendTokenUpdatesBatch(basketId, bulkRequestDto)
+        if (!response.isSuccessful) {
+            Timber.e(response.raw().toString())
+            throw RuntimeException(response.errorBody().toString())
+        }
+    }
 
-        Timber.i("Earn response $earnResponse")
+    override suspend fun retrieveTokenUpdatesResults(basketId: UUID): BulkResponseDto {
+        val response = cryptoApiService.retrieveTokenUpdatesResults(basketId)
+        if (!response.isSuccessful || response.body() == null) {
+            Timber.e(response.raw().toString())
+            throw RuntimeException(response.errorBody().toString())
+        }
+        return response.body()!!
+    }
 
-        // The basket service computes the value in the backend, so no need to send it over the wire
-        val newToken = incentiveSystem.handleEarnRequestResponse(
-            promotionParameters,
-            earnRequest,
-            SPSEQSignature(
-                jsonConverter.deserialize(earnResponse.body()),
-                pp.bg.g1,
-                pp.bg.g2
-            ),
-            Vector.of(BigInteger.valueOf(basketValue.toLong())),
-            token,
-            providerPublicKey,
-            userKeyPair
+    override suspend fun putToken(promotionParameters: PromotionParameters, token: Token) {
+        cryptoDao.insertToken(
+            CryptoTokenEntity(
+                promotionParameters.promotionId.toInt(),
+                jsonConverter.serialize(token.representation)
+            )
         )
-
-        cryptoDao.insertToken(toCryptoTokenEntity(newToken))
-        Timber.i("Added new token $newToken to database")
     }
 
     override suspend fun refreshCryptoMaterial(): Boolean {

android/app/src/main/java/org/cryptimeleon/incentive/app/data/PromotionRepository.kt

@@ -6,11 +6,15 @@ import kotlinx.coroutines.flow.flowOn
 import kotlinx.coroutines.flow.map
 import org.cryptimeleon.incentive.app.data.database.promotion.PromotionDao
 import org.cryptimeleon.incentive.app.data.database.promotion.PromotionEntity
+import org.cryptimeleon.incentive.app.data.database.promotion.TokenUpdateUserChoiceEntity
 import org.cryptimeleon.incentive.app.data.network.PromotionApiService
 import org.cryptimeleon.incentive.app.domain.IPromotionRepository
+import org.cryptimeleon.incentive.app.domain.model.PromotionUserUpdateChoice
+import org.cryptimeleon.incentive.app.domain.model.UserUpdateChoice
 import org.cryptimeleon.incentive.promotion.Promotion
 import org.cryptimeleon.math.serialization.RepresentableRepresentation
 import org.cryptimeleon.math.serialization.converter.JSONConverter
+import java.math.BigInteger
 
 class PromotionRepository(
     private val promotionApiService: PromotionApiService,
@@ -27,6 +31,17 @@ class PromotionRepository(
             }
         }.flowOn(Dispatchers.IO)
 
+    override val userUpdateChoices: Flow<List<PromotionUserUpdateChoice>> =
+        promotionDao.observerUserTokenUpdateChoices()
+            .map { userUpdateChoiceEntities: List<TokenUpdateUserChoiceEntity> ->
+                userUpdateChoiceEntities.map {
+                    PromotionUserUpdateChoice(
+                        it.promotionId,
+                        it.userUpdateChoice
+                    )
+                }
+            }.flowOn(Dispatchers.IO)
+
     override suspend fun reloadPromotions() {
         val promotionsResponse = promotionApiService.getPromotions()
         if (promotionsResponse.isSuccessful) {
@@ -43,4 +58,8 @@ class PromotionRepository(
             throw RuntimeException("Could not load promotions!")
         }
     }
+
+    override suspend fun putUserUpdateChoice(promotionId: BigInteger, choice: UserUpdateChoice) {
+        promotionDao.putUserTokenUpdateChoice(TokenUpdateUserChoiceEntity(promotionId, choice))
+    }
 }

android/app/src/main/java/org/cryptimeleon/incentive/app/data/database/BigIntegerConverter.kt

@@ -0,0 +1,17 @@
+package org.cryptimeleon.incentive.app.data.database
+
+import androidx.room.TypeConverter
+import com.google.gson.Gson
+import java.math.BigInteger
+
+class BigIntegerConverter {
+    companion object {
+        @JvmStatic
+        @TypeConverter
+        fun fromBigInteger(b: BigInteger): String = Gson().toJson(b)
+
+        @JvmStatic
+        @TypeConverter
+        fun toBigInteger(s: String): BigInteger = Gson().fromJson(s, BigInteger::class.java)
+    }
+}

android/app/src/main/java/org/cryptimeleon/incentive/app/data/database/promotion/PromotionDao.kt

@@ -13,4 +13,10 @@ interface PromotionDao {
 
     @Insert(onConflict = OnConflictStrategy.REPLACE)
     fun insertPromotions(promotionEntities: List<PromotionEntity>)
-}
+
+    @Query("SELECT * FROM `token-update-user-choices`")
+    fun observerUserTokenUpdateChoices(): Flow<List<TokenUpdateUserChoiceEntity>>
+
+    @Insert(onConflict = OnConflictStrategy.REPLACE)
+    fun putUserTokenUpdateChoice(tokenUpdateUserChoiceEntity: TokenUpdateUserChoiceEntity)
+}

android/app/src/main/java/org/cryptimeleon/incentive/app/data/database/promotion/PromotionDatabase.kt

@@ -4,10 +4,10 @@ import androidx.room.Database
 import androidx.room.RoomDatabase
 
 @Database(
-    entities = [PromotionEntity::class],
+    entities = [PromotionEntity::class, TokenUpdateUserChoiceEntity::class],
     version = 1,
     exportSchema = false
 )
 abstract class PromotionDatabase : RoomDatabase() {
     abstract fun promotionDatabaseDao(): PromotionDao
-}
+}

android/app/src/main/java/org/cryptimeleon/incentive/app/data/database/promotion/TokenUpdateUserChoiceEntity.kt

@@ -0,0 +1,37 @@
+package org.cryptimeleon.incentive.app.data.database.promotion
+
+import androidx.room.Entity
+import androidx.room.PrimaryKey
+import androidx.room.TypeConverter
+import androidx.room.TypeConverters
+import kotlinx.serialization.decodeFromString
+import kotlinx.serialization.encodeToString
+import kotlinx.serialization.json.Json
+import org.cryptimeleon.incentive.app.data.database.BigIntegerConverter
+import org.cryptimeleon.incentive.app.domain.model.UserUpdateChoice
+import org.cryptimeleon.incentive.app.domain.model.module
+import java.math.BigInteger
+
+private val json = Json { serializersModule = module }
+
+@TypeConverters(value = [TokenUpdateUserChoiceEntity.UserUpdateChoiceConverter::class, BigIntegerConverter::class])
+@Entity(tableName = "token-update-user-choices")
+data class TokenUpdateUserChoiceEntity(
+    @PrimaryKey
+    val promotionId: BigInteger,
+    val userUpdateChoice: UserUpdateChoice
+) {
+    // Converter for storing the choices in the room database
+    class UserUpdateChoiceConverter {
+        companion object {
+            @JvmStatic
+            @TypeConverter
+            fun fromChoice(userUpdateChoice: UserUpdateChoice): String =
+                json.encodeToString(userUpdateChoice)
+
+            @JvmStatic
+            @TypeConverter
+            fun toChoice(s: String): UserUpdateChoice = json.decodeFromString(s,)
+        }
+    }
+}

android/app/src/main/java/org/cryptimeleon/incentive/app/data/network/BasketApiService.kt

@@ -40,7 +40,7 @@ interface BasketApiService {
 
     // This endpoint is for developing only and will be replaced by some payment process in the future
     @POST("basket/pay-dev")
-    suspend fun payBasket(@Body networkPayBody: NetworkPayBody): Response<Unit>
+    suspend fun payBasket(@Header("basket-id") basketId: UUID): Response<Unit>
 
     @GET("basket")
     suspend fun getBasketContent(@Header("basketId") basketId: UUID): Response<NetworkBasket>