From 9400d765f07f57adb775518c5b66d8001893a7c4 Mon Sep 17 00:00:00 2001
From: Torsten Grote <t@grobox.de>
Date: Thu, 2 Jul 2020 16:09:07 -0300
Subject: [wallet] Try to connect to open Wi-Fi

if included in fragment of scanned/opened taler:// URI
---
 .idea/dictionaries/user.xml                        |  1 +
 wallet/src/main/AndroidManifest.xml                |  3 ++
 .../src/main/java/net/taler/wallet/MainActivity.kt |  6 +++
 wallet/src/main/java/net/taler/wallet/Utils.kt     | 63 ++++++++++++++++++++++
 wallet/src/main/res/values/strings.xml             |  2 +
 5 files changed, 75 insertions(+)

diff --git a/.idea/dictionaries/user.xml b/.idea/dictionaries/user.xml
index 0609fdc..1bcab63 100644
--- a/.idea/dictionaries/user.xml
+++ b/.idea/dictionaries/user.xml
@@ -9,6 +9,7 @@
       <w>markwon</w>
       <w>servicedesc</w>
       <w>snackbar</w>
+      <w>ssid</w>
       <w>taler</w>
       <w>testkudos</w>
     </words>
diff --git a/wallet/src/main/AndroidManifest.xml b/wallet/src/main/AndroidManifest.xml
index 5d86a77..e2a79da 100644
--- a/wallet/src/main/AndroidManifest.xml
+++ b/wallet/src/main/AndroidManifest.xml
@@ -18,6 +18,9 @@
     xmlns:tools="http://schemas.android.com/tools"
     package="net.taler.wallet">
 
+    <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
+    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
+    <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
     <uses-permission android:name="android.permission.NFC" />
 
     <uses-feature
diff --git a/wallet/src/main/java/net/taler/wallet/MainActivity.kt b/wallet/src/main/java/net/taler/wallet/MainActivity.kt
index 2eeb4fd..786e40e 100644
--- a/wallet/src/main/java/net/taler/wallet/MainActivity.kt
+++ b/wallet/src/main/java/net/taler/wallet/MainActivity.kt
@@ -22,6 +22,7 @@ import android.content.Context
 import android.content.Intent
 import android.content.Intent.ACTION_VIEW
 import android.content.IntentFilter
+import android.net.Uri
 import android.os.Bundle
 import android.util.Log
 import android.view.MenuItem
@@ -48,6 +49,7 @@ import com.google.zxing.integration.android.IntentIntegrator
 import com.google.zxing.integration.android.IntentIntegrator.parseActivityResult
 import kotlinx.android.synthetic.main.activity_main.*
 import kotlinx.android.synthetic.main.app_bar_main.*
+import net.taler.common.isOnline
 import net.taler.wallet.BuildConfig.VERSION_CODE
 import net.taler.wallet.BuildConfig.VERSION_NAME
 import net.taler.wallet.HostCardEmulatorService.Companion.HTTP_TUNNEL_RESPONSE
@@ -144,6 +146,10 @@ class MainActivity : AppCompatActivity(), OnNavigationItemSelectedListener,
     }
 
     private fun handleTalerUri(url: String, from: String) {
+        val uri = Uri.parse(url)
+        if (uri.fragment != null && !isOnline()) {
+            connectToWifi(this, uri.fragment!!)
+        }
         when {
             url.toLowerCase(ROOT).startsWith("taler://pay/") -> {
                 Log.v(TAG, "navigating!")
diff --git a/wallet/src/main/java/net/taler/wallet/Utils.kt b/wallet/src/main/java/net/taler/wallet/Utils.kt
index b41a202..e299245 100644
--- a/wallet/src/main/java/net/taler/wallet/Utils.kt
+++ b/wallet/src/main/java/net/taler/wallet/Utils.kt
@@ -17,6 +17,18 @@
 package net.taler.wallet
 
 import android.app.Activity
+import android.content.Context
+import android.net.ConnectivityManager
+import android.net.ConnectivityManager.NetworkCallback
+import android.net.NetworkCapabilities
+import android.net.NetworkRequest
+import android.net.wifi.WifiConfiguration
+import android.net.wifi.WifiManager
+import android.net.wifi.WifiNetworkSpecifier
+import android.os.Build.VERSION.SDK_INT
+import android.widget.Toast
+import android.widget.Toast.LENGTH_LONG
+import androidx.annotation.RequiresApi
 import com.google.zxing.integration.android.IntentIntegrator
 
 fun scanQrCode(activity: Activity) {
@@ -27,6 +39,57 @@ fun scanQrCode(activity: Activity) {
     }.initiateScan(listOf(IntentIntegrator.QR_CODE))
 }
 
+fun connectToWifi(context: Context, ssid: String) {
+    if (SDK_INT >= 29) {
+        connectToWifi29(context, ssid)
+    } else {
+        connectToWifiDeprecated(context, ssid)
+    }
+}
+
+@RequiresApi(29)
+private fun connectToWifi29(context: Context, ssid: String) {
+    val wifiManager = context.getSystemService(WifiManager::class.java)
+    if (wifiManager?.isWifiEnabled == false) {
+        // we are not allowed to enable the WiFi anymore, so show at least a hint about it
+        Toast.makeText(context, R.string.wifi_disabled_error, LENGTH_LONG).show()
+    }
+
+    val specifier = WifiNetworkSpecifier.Builder()
+        .setSsid(ssid)
+        .build()
+    val request = NetworkRequest.Builder()
+        .addTransportType(NetworkCapabilities.TRANSPORT_WIFI)
+        .setNetworkSpecifier(specifier)
+        .build()
+    val connectivityManager = context.getSystemService(ConnectivityManager::class.java)
+    connectivityManager?.requestNetwork(request, NetworkCallback())
+}
+
+@Suppress("DEPRECATION")
+private fun connectToWifiDeprecated(context: Context, ssid: String) {
+    context.getSystemService(WifiManager::class.java)?.apply {
+        if (!isWifiEnabled) {
+            val enabledResult = setWifiEnabled(true)
+            while (enabledResult && !isWifiEnabled) Thread.sleep(25)
+        }
+        val wifiConfig = WifiConfiguration().apply {
+            SSID = "\"$ssid\""
+            allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE)
+        }
+        addNetwork(wifiConfig).let { netId ->
+            if (netId == -1) {
+                val str = context.getString(R.string.wifi_connect_error, ssid)
+                Toast.makeText(context, str, LENGTH_LONG).show()
+            } else {
+                disconnect()
+                enableNetwork(netId, true)
+                reconnect()
+            }
+        }
+    }
+}
+
 fun cleanExchange(exchange: String) = exchange.let {
     if (it.startsWith("https://")) it.substring(8) else it
 }.trimEnd('/')
diff --git a/wallet/src/main/res/values/strings.xml b/wallet/src/main/res/values/strings.xml
index c856345..fec5948 100644
--- a/wallet/src/main/res/values/strings.xml
+++ b/wallet/src/main/res/values/strings.xml
@@ -155,5 +155,7 @@ GNU Taler is immune against many types of fraud, such as phishing of credit card
     <string name="refund_success">Refund received</string>
 
     <string name="tip_title">Tip</string>
+    <string name="wifi_disabled_error">Turn on Wi-Fi to get free Wi-Fi</string>
+    <string name="wifi_connect_error">Could not connect to free Wi-Fi: %s</string>
 
 </resources>
-- 
cgit v1.2.3