Offline Digital Euro

app/build.gradle

@@ -126,6 +126,7 @@ dependencies {
     implementation project(':atomic-swap')
     implementation project(':literaturedao')
     implementation project(':detoks')
+    implementation project(':offlinedigitaleuro')
     api(project(':common')) {
         exclude group: 'net.java.dev.jna'
     }

app/src/main/AndroidManifest.xml

@@ -127,6 +127,11 @@
             android:parentActivityName=".ui.dashboard.DashboardActivity"
             android:theme="@style/Fullscreen" />
 
+        <activity
+            android:name="nl.tudelft.trustchain.offlinedigitaleuro.MainActivityOfflineDigitalEuro"
+            android:parentActivityName=".ui.dashboard.DashboardActivity"
+            android:theme="@style/Theme.PeerChat" />
+
         <activity
             android:name="nl.tudelft.trustchain.valuetransfer.ValueTransferMainActivity"
             android:exported="true"

app/src/main/java/nl/tudelft/trustchain/app/AppDefinition.kt

@@ -21,6 +21,7 @@ import nl.tudelft.trustchain.trader.ui.TrustChainTraderActivity
 import nl.tudelft.trustchain.valuetransfer.ValueTransferMainActivity
 import nl.tudelft.trustchain.voting.VotingActivity
 import nl.tudelft.trustchain.detoks.DeToksActivity
+import nl.tudelft.trustchain.offlinedigitaleuro.MainActivityOfflineDigitalEuro
 
 enum class AppDefinition(
     @DrawableRes val icon: Int,
@@ -36,6 +37,13 @@ enum class AppDefinition(
         DeToksActivity::class.java,
         true,
     ),
+    OFFLINE_MONEY(
+        R.drawable.ic_offline_money,
+        "Offline Digital Euro",
+        R.color.black,
+        MainActivityOfflineDigitalEuro::class.java,
+        true,
+    ),
     EIGHTEEN_PLUS(
         R.drawable.ic_18_plus,
         "18+",

app/src/main/java/nl/tudelft/trustchain/app/AppLoader.kt

@@ -73,6 +73,7 @@ class AppLoader(
         val PREFERRED_APPS = stringSetPreferencesKey("preferred_apps")
         val DEFAULT_APPS = setOf(
             AppDefinition.DETOKS.appName,
+            AppDefinition.OFFLINE_MONEY.appName,
             AppDefinition.VALUETRANSFER.appName,
             AppDefinition.MUSIC_DAO.appName,
             AppDefinition.EIGHTEEN_PLUS.appName

common/src/main/res/drawable/ic_offline_money.xml

@@ -0,0 +1,36 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="83dp"
+    android:height="83dp"
+    android:viewportWidth="83"
+    android:viewportHeight="83">
+  <path
+      android:pathData="M1.5,41.5a40,40 0,1 0,80 0a40,40 0,1 0,-80 0z"
+      android:strokeWidth="3"
+      android:fillColor="#00000000"
+      android:strokeColor="#ffff00"/>
+  <path
+      android:pathData="M6.5,41.5a35,35 0,1 0,70 0a35,35 0,1 0,-70 0z"
+      android:strokeWidth="3"
+      android:fillColor="#00000000"
+      android:strokeColor="#ffff00"/>
+  <path
+      android:pathData="M41.5,61.75L37.45,57.7C39.7,55.5 43.3,55.5 45.55,57.7ZM49.72,53.65C47.54,51.46 44.59,50.23 41.5,50.23C38.41,50.23 35.46,51.46 33.28,53.65L29.23,49.49C36.01,42.72 46.99,42.72 53.77,49.49ZM57.93,45.44C53.59,41.06 47.67,38.59 41.5,38.59C35.33,38.59 29.41,41.06 25.07,45.44L21.13,41.21C32.41,30.04 50.59,30.04 61.87,41.21ZM66.03,37.16C52.48,23.63 30.52,23.63 16.97,37.16L12.86,33.11C20.46,25.52 30.76,21.25 41.5,21.25C52.24,21.25 62.54,25.52 70.14,33.11Z"
+      android:strokeWidth="2"
+      android:fillColor="#00000000"
+      android:strokeColor="#0080f0"/>
+  <path
+      android:pathData="M4,41.5a37.5,37.5 0,1 0,75 0a37.5,37.5 0,1 0,-75 0z"
+      android:strokeWidth="3"
+      android:fillColor="#00000000"
+      android:strokeColor="#ffff00"/>
+  <path
+      android:pathData="M36.5,66.5L36.5,16.5"
+      android:strokeWidth="2"
+      android:fillColor="#00000000"
+      android:strokeColor="#007fff"/>
+  <path
+      android:pathData="M46.5,66.5L46.5,16.5"
+      android:strokeWidth="2"
+      android:fillColor="#00000000"
+      android:strokeColor="#007fff"/>
+</vector>

offlinedigitaleuro/.gitignore

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

offlinedigitaleuro/build.gradle

@@ -0,0 +1,87 @@
+apply plugin: 'com.android.library'
+apply plugin: 'kotlin-android'
+apply plugin: 'kotlin-android-extensions'
+apply plugin: 'kotlin-kapt'
+
+android {
+    compileSdk 33
+
+    defaultConfig {
+        minSdkVersion 22
+        targetSdkVersion 33
+
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+        consumerProguardFiles "consumer-rules.pro"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+
+    buildFeatures {
+        viewBinding = true
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+    namespace 'nl.tudelft.trustchain.offlinedigitaleuro'
+}
+
+dependencies {
+
+    implementation project(':common')
+
+    implementation fileTree(dir: "libs", include: ["*.jar"])
+    implementation 'androidx.core:core-ktx:1.9.0'
+    implementation 'androidx.appcompat:appcompat:1.2.0'
+
+    implementation 'androidx.legacy:legacy-support-v4:1.0.0'
+
+    implementation 'androidx.navigation:navigation-fragment-ktx:2.3.0'
+    implementation 'androidx.navigation:navigation-ui-ktx:2.3.0'
+    implementation 'androidx.constraintlayout:constraintlayout:2.0.1'
+    implementation 'androidx.recyclerview:recyclerview:1.1.0'
+    implementation "androidx.room:room-runtime:$room_version"
+
+    implementation "androidx.lifecycle:lifecycle-runtime:$lifecycle_version"
+    implementation "androidx.lifecycle:lifecycle-common-java8:$lifecycle_version"
+    implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:$lifecycle_version"
+    implementation "androidx.lifecycle:lifecycle-livedata-ktx:$lifecycle_version"
+
+    implementation 'com.github.MattSkala:recyclerview-itemadapter:0.4'
+
+    // Material
+    implementation 'com.google.android.material:material:1.1.0'
+    implementation 'com.getbase:floatingactionbutton:1.10.1'
+
+    // Kotlin
+    implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
+    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:$coroutines_version"
+    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:$coroutines_version"
+    implementation "org.jetbrains.kotlin:kotlin-reflect:$kotlin_version"
+
+    // Logging
+    implementation 'io.github.microutils:kotlin-logging:1.7.7'
+
+    testImplementation 'junit:junit:4.12'
+
+    androidTestImplementation 'androidx.test.ext:junit:1.1.5'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1'
+
+
+    implementation 'androidx.room:room-common:2.5.0'
+    implementation 'androidx.room:room-ktx:2.5.0'
+    kapt "androidx.room:room-compiler:2.5.0"
+    implementation "androidx.activity:activity-ktx:1.6.1"
+    implementation "androidx.fragment:fragment-ktx:1.5.5"
+    annotationProcessor "android.arch.persistence.room:compiler:1.1.1"
+    implementation "androidx.room:room-runtime:2.5.0"
+
+    annotationProcessor "androidx.room:room-compiler:$room_version"
+
+    implementation 'com.github.travijuu:numberpicker:1.0.7'
+}

offlinedigitaleuro/proguard-rules.pro

@@ -0,0 +1,21 @@
+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

offlinedigitaleuro/src/androidTest/java/nl/tudelft/trustchain/offlinedigitaleuro/ExampleInstrumentedTest.kt

@@ -0,0 +1,24 @@
+package nl.tudelft.trustchain.offlinedigitaleuro
+
+import androidx.test.platform.app.InstrumentationRegistry
+import androidx.test.ext.junit.runners.AndroidJUnit4
+
+import org.junit.Test
+import org.junit.runner.RunWith
+
+import org.junit.Assert.*
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+@RunWith(AndroidJUnit4::class)
+class ExampleInstrumentedTest {
+    @Test
+    fun useAppContext() {
+        // Context of the app under test.
+        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
+        assertEquals("nl.tudelft.trustchain.offlinemoney", appContext.packageName)
+    }
+}

offlinedigitaleuro/src/main/AndroidManifest.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <application>
+        <activity android:name=".MainActivityOfflineDigitalEuro" />
+    </application>
+
+</manifest>

offlinedigitaleuro/src/main/java/nl/tudelft/trustchain/offlinedigitaleuro/MainActivityOfflineDigitalEuro.kt

@@ -0,0 +1,10 @@
+package nl.tudelft.trustchain.offlinedigitaleuro
+
+import nl.tudelft.trustchain.common.BaseActivity
+
+class MainActivityOfflineDigitalEuro() : BaseActivity() {
+    override val navigationGraph = R.navigation.nav_graph_offlinedigitaleuro
+    override val bottomNavigationMenu = R.menu.offlinedigitaleuro_menu
+}
+
+

offlinedigitaleuro/src/main/java/nl/tudelft/trustchain/offlinedigitaleuro/db/OfflineDigitalEuroRoomDatabase.kt

@@ -0,0 +1,36 @@
+package nl.tudelft.trustchain.offlinedigitaleuro.db
+
+import android.content.Context
+import androidx.room.Database
+import androidx.room.Room
+import androidx.room.RoomDatabase
+
+// Annotates class to be a Room Database with a table (entity) of the Word class
+
+@Database(entities = [UserData::class, Transactions::class, Token::class, WebOfTrust::class], version = 1, exportSchema = false)
+abstract class OfflineDigitalEuroRoomDatabase : RoomDatabase() {
+    abstract fun userDao(): UserDao
+    abstract fun transactionsDao(): TransactionsDao
+    abstract fun tokensDao(): TokensDao
+    abstract fun webOfTrustDao(): WebOfTrustDAO
+
+    companion object {
+        @Volatile
+        private var INSTANCE: OfflineDigitalEuroRoomDatabase? = null
+        fun getDatabase(context: Context): OfflineDigitalEuroRoomDatabase {
+            return INSTANCE ?: synchronized(this) {
+                val instance = Room.databaseBuilder(
+                    context.applicationContext,
+                    OfflineDigitalEuroRoomDatabase::class.java,
+                    "item_database"
+                )
+                    .fallbackToDestructiveMigration()
+                    .allowMainThreadQueries()
+                    .build()
+                INSTANCE = instance
+                return instance
+            }
+        }
+    }
+
+}

offlinedigitaleuro/src/main/java/nl/tudelft/trustchain/offlinedigitaleuro/db/Tokens.kt

@@ -0,0 +1,43 @@
+package nl.tudelft.trustchain.offlinedigitaleuro.db
+
+import androidx.room.*
+
+
+@Entity(tableName = "tokens_table")
+class Token(
+    @PrimaryKey() var token_id: String,
+    @ColumnInfo(name = "token_value") var token_value: Double,
+    @ColumnInfo(name = "token_data") var token_data: ByteArray,
+)
+
+
+@Dao
+interface TokensDao {
+    // Retrieve all tokens in database
+    @Query("SELECT * FROM tokens_table ORDER BY token_value")
+    fun getAllTokens() : Array<Token>
+
+    // Get all token_types from from database
+    @Query("SELECT * FROM tokens_table WHERE token_value = :token_value")
+    fun getAllTokensOfValue(token_value: Double) : Array<Token>
+
+    // Get an amount of token_types from from database
+    @Query("SELECT * FROM tokens_table WHERE token_value = :token_value LIMIT :count")
+    fun getCountOfTokensOfValue(token_value: Double, count: Int) : Array<Token>
+
+    // get how many tokens are of a certain value from database
+    @Query("SELECT COUNT(*) FROM tokens_table WHERE token_value = :token_value")
+    fun getCountTokensOfValue(token_value: Double) : Int
+
+    @Query("SELECT * FROM tokens_table WHERE token_id = :token_id")
+    fun getSpecificToken(token_id: String) : Array<Token>
+
+    // Insert transactions into the database
+    @Insert
+    suspend fun insertToken(tokens: Token)
+
+    // Delete transactions
+    @Query("DELETE FROM tokens_table WHERE token_id = :token_id")
+    fun deleteToken(token_id: String)
+
+}

offlinedigitaleuro/src/main/java/nl/tudelft/trustchain/offlinedigitaleuro/db/Transactions.kt

@@ -0,0 +1,33 @@
+package nl.tudelft.trustchain.offlinedigitaleuro.db
+
+import androidx.room.*
+
+
+@Entity(tableName = "transactions_table")
+class Transactions(
+    @PrimaryKey(autoGenerate = true) var id: Int = 0,
+    @ColumnInfo(name = "transaction_datetime") var transaction_datetime: String,
+    @ColumnInfo(name = "public_key") var public_key: String,
+    @ColumnInfo(name = "amount") var amount: Double,
+    @ColumnInfo(name = "verified") var verified: Boolean,
+)
+
+
+@Dao
+interface TransactionsDao {
+    // Get all transactions from database
+    @Query("SELECT * FROM transactions_table")
+    fun getTransactionData(): List<Transactions>
+
+    // Insert transactions into the database
+    @Insert
+    suspend fun insertTransaction(transactions: Transactions)
+
+    // Delete transactions
+    @Delete
+    suspend fun deleteTransactionData(transactions: Transactions)
+
+//    @Query("DELETE FROM transactions_table")
+//    suspend fun deleteTransactionData()
+
+}

offlinedigitaleuro/src/main/java/nl/tudelft/trustchain/offlinedigitaleuro/db/UserData.kt

@@ -0,0 +1,27 @@
+package nl.tudelft.trustchain.offlinedigitaleuro.db
+
+import androidx.room.*
+
+@Entity(tableName = "userdata_table")
+data class UserData(
+    @PrimaryKey(autoGenerate = true) val id: Int = 0,
+    @ColumnInfo(name = "username") val username: String,
+    @ColumnInfo(name = "public_key") val public_key: String,
+    @ColumnInfo(name = "private_key") val private_key: String,
+)
+
+@Dao
+interface UserDao {
+
+    @Query("SELECT * FROM userdata_table")
+    fun getUserData(): List<UserData>
+
+    @Insert
+    suspend fun insertUser(userData: UserData)
+
+    @Update
+    suspend fun updateUser(userData: UserData)
+
+    @Delete
+    suspend fun deleteUserData(userData: UserData)
+}