[wallet] show list of known exchanges in settings

11 files changed, 328 insertions, 1 deletions

diff --git a/wallet/src/main/java/net/taler/wallet/MainActivity.kt b/wallet/src/main/java/net/taler/wallet/MainActivity.kt
index 786e40e..a048446 100644
--- a/wallet/src/main/java/net/taler/wallet/MainActivity.kt
+++ b/wallet/src/main/java/net/taler/wallet/MainActivity.kt
@@ -222,6 +222,7 @@ class MainActivity : AppCompatActivity(), OnNavigationItemSelectedListener,
     ): Boolean {
         when (pref.key) {
             "pref_backup" -> nav.navigate(R.id.action_nav_settings_to_nav_settings_backup)
+            "pref_exchanges" -> nav.navigate(R.id.action_nav_settings_to_nav_settings_exchanges)
         }
         return true
     }
diff --git a/wallet/src/main/java/net/taler/wallet/MainViewModel.kt b/wallet/src/main/java/net/taler/wallet/MainViewModel.kt
index c69c31c..46f5021 100644
--- a/wallet/src/main/java/net/taler/wallet/MainViewModel.kt
+++ b/wallet/src/main/java/net/taler/wallet/MainViewModel.kt
@@ -33,6 +33,7 @@ import net.taler.common.assertUiThread
 import net.taler.common.toEvent
 import net.taler.wallet.backend.WalletBackendApi
 import net.taler.wallet.balances.BalanceItem
+import net.taler.wallet.exchanges.ExchangeManager
 import net.taler.wallet.history.DevHistoryManager
 import net.taler.wallet.payment.PaymentManager
 import net.taler.wallet.pending.PendingOperationsManager
@@ -102,6 +103,7 @@ class MainViewModel(val app: Application) : AndroidViewModel(app) {
     val transactionManager: TransactionManager =
         TransactionManager(walletBackendApi, viewModelScope, mapper)
     val refundManager = RefundManager(walletBackendApi)
+    val exchangeManager: ExchangeManager = ExchangeManager(walletBackendApi, mapper)
 
     private val mTransactionsEvent = MutableLiveData<Event<String>>()
     val transactionsEvent: LiveData<Event<String>> = mTransactionsEvent
diff --git a/wallet/src/main/java/net/taler/wallet/exchanges/ExchangeAdapter.kt b/wallet/src/main/java/net/taler/wallet/exchanges/ExchangeAdapter.kt
new file mode 100644
index 0000000..f53ce46
--- /dev/null
+++ b/wallet/src/main/java/net/taler/wallet/exchanges/ExchangeAdapter.kt
@@ -0,0 +1,66 @@
+/*
+ * This file is part of GNU Taler
+ * (C) 2020 Taler Systems S.A.
+ *
+ * GNU Taler is free software; you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation; either version 3, or (at your option) any later version.
+ *
+ * GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ * A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+package net.taler.wallet.exchanges
+
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.TextView
+import androidx.recyclerview.widget.RecyclerView
+import net.taler.wallet.R
+import net.taler.wallet.cleanExchange
+import net.taler.wallet.exchanges.ExchangeAdapter.ExchangeItemViewHolder
+
+data class ExchangeItem(
+    val exchangeBaseUrl: String,
+    val currency: String,
+    val paytoUris: List<String>
+)
+
+internal class ExchangeAdapter : RecyclerView.Adapter<ExchangeItemViewHolder>() {
+
+    private val items = ArrayList<ExchangeItem>()
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ExchangeItemViewHolder {
+        val view = LayoutInflater.from(parent.context)
+            .inflate(R.layout.list_item_exchange, parent, false)
+        return ExchangeItemViewHolder(view)
+    }
+
+    override fun getItemCount() = items.size
+
+    override fun onBindViewHolder(holder: ExchangeItemViewHolder, position: Int) {
+        holder.bind(items[position])
+    }
+
+    fun update(newItems: List<ExchangeItem>) {
+        items.clear()
+        items.addAll(newItems)
+        notifyDataSetChanged()
+    }
+
+    internal inner class ExchangeItemViewHolder(v: View) : RecyclerView.ViewHolder(v) {
+        private val context = v.context
+        private val urlView: TextView = v.findViewById(R.id.urlView)
+        private val currencyView: TextView = v.findViewById(R.id.currencyView)
+        fun bind(item: ExchangeItem) {
+            urlView.text = cleanExchange(item.exchangeBaseUrl)
+            currencyView.text = context.getString(R.string.exchange_list_currency, item.currency)
+        }
+    }
+
+}
diff --git a/wallet/src/main/java/net/taler/wallet/exchanges/ExchangeListFragment.kt b/wallet/src/main/java/net/taler/wallet/exchanges/ExchangeListFragment.kt
new file mode 100644
index 0000000..9d0c493
--- /dev/null
+++ b/wallet/src/main/java/net/taler/wallet/exchanges/ExchangeListFragment.kt
@@ -0,0 +1,68 @@
+/*
+ * This file is part of GNU Taler
+ * (C) 2020 Taler Systems S.A.
+ *
+ * GNU Taler is free software; you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation; either version 3, or (at your option) any later version.
+ *
+ * GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ * A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+package net.taler.wallet.exchanges
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.fragment.app.Fragment
+import androidx.fragment.app.activityViewModels
+import androidx.lifecycle.Observer
+import androidx.recyclerview.widget.DividerItemDecoration
+import androidx.recyclerview.widget.LinearLayoutManager
+import kotlinx.android.synthetic.main.fragment_exchange_list.*
+import net.taler.common.fadeIn
+import net.taler.common.fadeOut
+import net.taler.wallet.MainViewModel
+import net.taler.wallet.R
+
+class ExchangeListFragment : Fragment() {
+
+    private val model: MainViewModel by activityViewModels()
+    private val exchangeManager by lazy { model.exchangeManager }
+    private val exchangeAdapter by lazy { ExchangeAdapter() }
+
+    override fun onCreateView(
+        inflater: LayoutInflater, container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        return inflater.inflate(R.layout.fragment_exchange_list, container, false)
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        list.apply {
+            adapter = exchangeAdapter
+            addItemDecoration(DividerItemDecoration(context, LinearLayoutManager.VERTICAL))
+        }
+
+        exchangeManager.progress.observe(viewLifecycleOwner, Observer { show ->
+            if (show) progressBar.fadeIn() else progressBar.fadeOut()
+        })
+        exchangeManager.exchanges.observe(viewLifecycleOwner, Observer { exchanges ->
+            exchangeAdapter.update(exchanges)
+            if (exchanges.isEmpty()) {
+                emptyState.fadeIn()
+                list.fadeOut()
+            } else {
+                emptyState.fadeOut()
+                list.fadeIn()
+            }
+        })
+    }
+
+}
diff --git a/wallet/src/main/java/net/taler/wallet/exchanges/ExchangeManager.kt b/wallet/src/main/java/net/taler/wallet/exchanges/ExchangeManager.kt
new file mode 100644
index 0000000..fe8ac76
--- /dev/null
+++ b/wallet/src/main/java/net/taler/wallet/exchanges/ExchangeManager.kt
@@ -0,0 +1,65 @@
+/*
+ * This file is part of GNU Taler
+ * (C) 2020 Taler Systems S.A.
+ *
+ * GNU Taler is free software; you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation; either version 3, or (at your option) any later version.
+ *
+ * GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ * A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+package net.taler.wallet.exchanges
+
+import android.util.Log
+import androidx.lifecycle.LiveData
+import androidx.lifecycle.MutableLiveData
+import com.fasterxml.jackson.databind.ObjectMapper
+import com.fasterxml.jackson.module.kotlin.readValue
+import net.taler.wallet.TAG
+import net.taler.wallet.backend.WalletBackendApi
+import org.json.JSONObject
+
+class ExchangeManager(
+    private val walletBackendApi: WalletBackendApi,
+    private val mapper: ObjectMapper
+) {
+
+    private val mProgress = MutableLiveData<Boolean>()
+    val progress: LiveData<Boolean> = mProgress
+
+    private val mExchanges = MutableLiveData<List<ExchangeItem>>()
+    val exchanges: LiveData<List<ExchangeItem>> get() = list()
+
+    fun add(exchangeUrl: String) {
+        val args = JSONObject().apply { put("exchangeBaseUrl", exchangeUrl) }
+        walletBackendApi.sendRequest("addExchange", args) { isError, result ->
+            if (isError) {
+                Log.e(TAG, "add Error: $result")
+            } else {
+                Log.e(TAG, "add Success: $result")
+            }
+        }
+    }
+
+    private fun list(): LiveData<List<ExchangeItem>> {
+        mProgress.value = true
+        walletBackendApi.sendRequest("listExchanges", JSONObject()) { isError, result ->
+            if (isError) {
+                throw AssertionError("Wallet core failed to return exchanges!")
+            } else {
+                val exchanges: List<ExchangeItem> = mapper.readValue(result.getString("exchanges"))
+                Log.e(TAG, "list Success: $exchanges")
+                mProgress.value = false
+                mExchanges.value = exchanges
+            }
+        }
+        return mExchanges
+    }
+
+}
diff --git a/wallet/src/main/java/net/taler/wallet/transactions/TransactionManager.kt b/wallet/src/main/java/net/taler/wallet/transactions/TransactionManager.kt
index 882b29b..d8204b6 100644
--- a/wallet/src/main/java/net/taler/wallet/transactions/TransactionManager.kt
+++ b/wallet/src/main/java/net/taler/wallet/transactions/TransactionManager.kt
@@ -28,7 +28,8 @@ import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
 import net.taler.wallet.backend.WalletBackendApi
 import org.json.JSONObject
-import java.util.*
+import java.util.HashMap
+import java.util.LinkedList
 
 sealed class TransactionsResult {
     object Error : TransactionsResult()
@@ -72,6 +73,7 @@ class TransactionManager(
         walletBackendApi.sendRequest("getTransactions", request) { isError, result ->
             if (isError) {
                 liveData.postValue(TransactionsResult.Error)
+                mProgress.postValue(false)
             } else {
                 val currencyToUpdate = if (searchQuery == null) currency else null
                 scope.launch(Dispatchers.Default) {
diff --git a/wallet/src/main/res/layout/fragment_exchange_list.xml b/wallet/src/main/res/layout/fragment_exchange_list.xml
new file mode 100644
index 0000000..e08901e
--- /dev/null
+++ b/wallet/src/main/res/layout/fragment_exchange_list.xml
@@ -0,0 +1,52 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ This file is part of GNU Taler
+  ~ (C) 2020 Taler Systems S.A.
+  ~
+  ~ GNU Taler is free software; you can redistribute it and/or modify it under the
+  ~ terms of the GNU General Public License as published by the Free Software
+  ~ Foundation; either version 3, or (at your option) any later version.
+  ~
+  ~ GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
+  ~ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+  ~ A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with
+  ~ GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+  -->
+
+<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <androidx.recyclerview.widget.RecyclerView
+        android:id="@+id/list"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:scrollbars="vertical"
+        android:visibility="invisible"
+        app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
+        tools:listitem="@layout/list_item_history"
+        tools:visibility="visible" />
+
+    <TextView
+        android:id="@+id/emptyState"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:gravity="center"
+        android:text="@string/exchange_list_empty"
+        android:visibility="invisible"
+        tools:visibility="visible" />
+
+    <ProgressBar
+        android:id="@+id/progressBar"
+        style="?android:progressBarStyleLarge"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:visibility="invisible"
+        tools:visibility="visible" />
+
+</androidx.coordinatorlayout.widget.CoordinatorLayout>
diff --git a/wallet/src/main/res/layout/list_item_exchange.xml b/wallet/src/main/res/layout/list_item_exchange.xml
new file mode 100644
index 0000000..4c646fe
--- /dev/null
+++ b/wallet/src/main/res/layout/list_item_exchange.xml
@@ -0,0 +1,50 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ This file is part of GNU Taler
+  ~ (C) 2020 Taler Systems S.A.
+  ~
+  ~ GNU Taler is free software; you can redistribute it and/or modify it under the
+  ~ terms of the GNU General Public License as published by the Free Software
+  ~ Foundation; either version 3, or (at your option) any later version.
+  ~
+  ~ GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
+  ~ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+  ~ A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with
+  ~ GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+  -->
+
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:background="@drawable/selectable_background"
+    android:foreground="?attr/selectableItemBackground"
+    android:padding="16dp">
+
+    <TextView
+        android:id="@+id/urlView"
+        style="@style/TransactionTitle"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginEnd="8dp"
+        android:textSize="18sp"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        tools:text="exchange.test.taler.net" />
+
+    <TextView
+        android:id="@+id/currencyView"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="8dp"
+        android:layout_marginEnd="8dp"
+        android:textSize="14sp"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="@+id/urlView"
+        app:layout_constraintTop_toBottomOf="@+id/urlView"
+        tools:text="@string/exchange_list_currency" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>
diff --git a/wallet/src/main/res/navigation/nav_graph.xml b/wallet/src/main/res/navigation/nav_graph.xml
index 51dcaba..7019597 100644
--- a/wallet/src/main/res/navigation/nav_graph.xml
+++ b/wallet/src/main/res/navigation/nav_graph.xml
@@ -59,11 +59,19 @@
         android:name="net.taler.wallet.settings.SettingsFragment"
         android:label="@string/menu_settings">
         <action
+            android:id="@+id/action_nav_settings_to_nav_settings_exchanges"
+            app:destination="@id/nav_settings_exchanges" />
+        <action
             android:id="@+id/action_nav_settings_to_nav_settings_backup"
             app:destination="@id/nav_settings_backup" />
     </fragment>
 
     <fragment
+        android:id="@+id/nav_settings_exchanges"
+        android:name="net.taler.wallet.exchanges.ExchangeListFragment"
+        android:label="@string/exchange_list_title"/>
+
+    <fragment
         android:id="@+id/nav_settings_backup"
         android:name="net.taler.wallet.settings.BackupSettingsFragment"
         android:label="@string/nav_settings_backup"/>
diff --git a/wallet/src/main/res/values/strings.xml b/wallet/src/main/res/values/strings.xml
index fec5948..79a3630 100644
--- a/wallet/src/main/res/values/strings.xml
+++ b/wallet/src/main/res/values/strings.xml
@@ -112,6 +112,12 @@ GNU Taler is immune against many types of fraud, such as phishing of credit card
     <string name="withdraw_error_title">Withdrawal Error</string>
     <string name="withdraw_error_message">Withdrawing is currently not possible. Please try again later!</string>
 
+    <string name="exchange_settings_title">Exchanges</string>
+    <string name="exchange_settings_summary">Manage list of exchanges known to this wallet</string>
+    <string name="exchange_list_title">Exchanges</string>
+    <string name="exchange_list_empty">No exchanges known\n\nAdd one manually or withdraw digital cash!</string>
+    <string name="exchange_list_currency">Currency: %s</string>
+
     <string name="exchange_fee_withdrawal_fee_label">Withdrawal Fee:</string>
     <string name="exchange_fee_overhead_label">Rounding Loss:</string>
     <string name="exchange_fee_coin_expiration_label">Earliest Coin Expiry:</string>
diff --git a/wallet/src/main/res/xml/settings_main.xml b/wallet/src/main/res/xml/settings_main.xml
index 4defc08..4c2f149 100644
--- a/wallet/src/main/res/xml/settings_main.xml
+++ b/wallet/src/main/res/xml/settings_main.xml
@@ -18,6 +18,13 @@
     xmlns:tools="http://schemas.android.com/tools">
 
     <Preference
+        app:fragment="net.taler.wallet.exchanges.ExchangeListFragment"
+        app:icon="@drawable/ic_account_balance"
+        app:key="pref_exchanges"
+        app:summary="@string/exchange_settings_summary"
+        app:title="@string/exchange_settings_title" />
+
+    <Preference
         app:fragment="net.taler.wallet.settings.BackupSettingsFragment"
         app:icon="@drawable/ic_baseline_backup"
         app:isPreferenceVisible="false"