wpadebug: Add support for QR Code scanning and display via zxing

Enhance wpadebug application to support scanning and displaying of QR
codes. This depends on a third-party source: zxing
(https://github.com/zxing/zxing).

Shell command to launch scanner/viewer via wpadebug is:
>adb root
>adb shell

Scanner:
>am start -n w1.fi.wpadebug/w1.fi.wpadebug.QrCodeScannerActivity
Viewer:
>am start -n w1.fi.wpadebug/w1.fi.wpadebug.QrCodeDisplayActivity

QR code string input/output file would be generated in
'/sdcard/wpadebug_qrdata.txt' in the device.

Signed-off-by: Jouni Malinen <jouni@codeaurora.org>

wpadebug/AndroidManifest.xml

@@ -8,6 +8,7 @@
     <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
     <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
     <uses-permission android:name="android.permission.INTERNET" />
+	<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
     <application android:label="wpadebug">
         <activity android:name="w1.fi.wpadebug.MainActivity"
                   android:label="wpadebug">
@@ -45,6 +46,14 @@
 		  android:label="Credential"
 		  android:parentActivityName="w1.fi.wpadebug.WpaCredActivity">
 	</activity>
+	<activity android:name="w1.fi.wpadebug.QrCodeScannerActivity"
+		  android:label="QR Code Reader"
+		  android:parentActivityName="w1.fi.wpadebug.MainActivity">
+	</activity>
+	<activity android:name="w1.fi.wpadebug.QrCodeDisplayActivity"
+		  android:label="QR Code Display"
+		  android:parentActivityName="w1.fi.wpadebug.MainActivity">
+	</activity>
 	<activity android:name="w1.fi.wpadebug.WpaWebViewActivity"
 		  android:label="WebView"
 		  android:launchMode="singleTop"

wpadebug/README

@@ -20,6 +20,19 @@ Build
 -----
 
 - Install Android SDK and build tools
+
+wpadebug depends on zxing core to launch QR code display/scanning.
+To build zxing core:
+
+- mkdir hostap/wpadebug/libs # target for the jar file
+- Install maven tool
+- clone latest zxing code [git clone https://github.com/zxing/zxing.git]
+- cd zxing/core
+- run: mvn install -DskipTests
+- copy target/core-*.*.*-SNAPSHOT.jar to hostap/wpadebug/libs
+
+To build wpadebug application:
+
 - update project target if desired; for example:
   android list targets
   android update project --target 1 --path $PWD

wpadebug/res/layout/qrcode.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+	android:orientation="vertical"
+	android:layout_width="match_parent"
+	android:layout_height="match_parent"
+	android:gravity="center_horizontal">
+	<ImageView
+		android:id="@+id/qrCode"
+		android:layout_width="350dp"
+		android:layout_height="350dp"
+		android:layout_marginTop="20dp"
+		/>
+</LinearLayout>

wpadebug/src/w1/fi/wpadebug/QrCodeDisplayActivity.java

@@ -0,0 +1,109 @@
+/*
+ * wpadebug - wpa_supplicant and Wi-Fi debugging app for Android
+ * Copyright (c) 2018, The Linux Foundation
+ *
+ * This software may be distributed under the terms of the BSD license.
+ * See README for more details.
+ */
+
+package w1.fi.wpadebug;
+
+import android.app.Activity;
+import android.graphics.Bitmap;
+import android.os.Bundle;
+import android.text.TextUtils;
+import android.util.Log;
+import android.widget.ImageView;
+
+import com.google.zxing.BarcodeFormat;
+import com.google.zxing.MultiFormatWriter;
+import com.google.zxing.WriterException;
+import com.google.zxing.common.BitMatrix;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.io.InputStreamReader;
+
+public class QrCodeDisplayActivity extends Activity {
+
+    private static final String TAG = "wpadebug";
+    private static final String FILE_NAME = "wpadebug_qrdata.txt";
+    private ImageView imageView;
+
+    // Below set of configs are used for QR code display window
+    private final static int WHITE = 0xFFFFFFFF;
+    private final static int BLACK = 0xFF000000;
+    private final static int WIDTH = 400;
+    private final static int HEIGHT = 400;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        // create imageview for this and attach to this activity.
+        setContentView(R.layout.qrcode);
+        imageView = (ImageView) findViewById(R.id.qrCode);
+        String str = readFromFile(FILE_NAME);
+
+        //Encode and launch qrcode now
+        try {
+            Bitmap bitmap = (TextUtils.isEmpty(str)) ? null : encodeAsBitmap(str);
+            if (bitmap != null) {
+                imageView.setImageBitmap(bitmap);
+            } else {
+                Log.e(TAG, "Failed to generate bitmap for uri=" + str);
+                finish();
+            }
+        } catch (WriterException e) {
+            e.printStackTrace();
+            finish();
+        }
+    }
+
+    private Bitmap encodeAsBitmap(String str) throws WriterException {
+        BitMatrix result;
+        try {
+            result = new MultiFormatWriter().encode(str, BarcodeFormat.QR_CODE, WIDTH, HEIGHT, null);
+        } catch (IllegalArgumentException iae) {
+            // Unsupported format
+            return null;
+        }
+
+        int width = result.getWidth();
+        int height = result.getHeight();
+        int[] pixels = new int[width * height];
+        for (int y = 0; y < height; y++) {
+            int offset = y * width;
+            for (int x = 0; x < width; x++) {
+                pixels[offset + x] = result.get(x, y) ? BLACK : WHITE;
+            }
+        }
+
+        Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
+        bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
+        return bitmap;
+    }
+
+    private String readFromFile(String filePath) {
+        try {
+            FileInputStream fis = new FileInputStream(new File("/sdcard", filePath));
+            BufferedReader br = new BufferedReader(new InputStreamReader(fis, "UTF-8"));
+            StringBuilder sb = new StringBuilder();
+            String line;
+            while(( line = br.readLine()) != null ) {
+                sb.append( line );
+                sb.append( '\n' );
+            }
+            return sb.toString();
+        }
+        catch (FileNotFoundException e) {
+            Log.e(TAG, "File not found: " + e.toString());
+        } catch (IOException e) {
+            Log.e(TAG, "Can not read file: " + e.toString());
+        }
+
+        return null;
+    }
+}

wpadebug/src/w1/fi/wpadebug/QrCodeScannerActivity.java

@@ -0,0 +1,75 @@
+/*
+ * wpadebug - wpa_supplicant and Wi-Fi debugging app for Android
+ * Copyright (c) 2018, The Linux Foundation
+ *
+ * This software may be distributed under the terms of the BSD license.
+ * See README for more details.
+ */
+
+package w1.fi.wpadebug;
+
+import android.app.Activity;
+import android.content.ActivityNotFoundException;
+import android.content.Intent;
+import android.os.Bundle;
+import android.util.Log;
+import android.widget.Toast;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.OutputStreamWriter;
+
+public class QrCodeScannerActivity extends Activity {
+
+    private static final String TAG = "wpadebug";
+    private static final String RESULT = "SCAN_RESULT";
+    private static final String FILE_NAME = "wpadebug_qrdata.txt";
+    private static final String ACTION = "com.google.zxing.client.android.SCAN";
+
+    private static final int QRCODE = 1;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        Intent intent = new Intent();
+        intent.setAction(ACTION);
+        try {
+            startActivityForResult(intent, QRCODE);
+        } catch (ActivityNotFoundException e) {
+            Log.e(TAG, "No QR code scanner found with name=" + ACTION);
+            Toast.makeText(QrCodeScannerActivity.this, "QR code scanner not found", Toast.LENGTH_SHORT).show();
+            finish();
+        }
+    }
+
+    @Override
+    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
+        if (requestCode == QRCODE && resultCode == RESULT_OK) {
+            writeToFile(data.getStringExtra(RESULT));
+            finish();
+        }
+    }
+
+    public void writeToFile(String data)
+    {
+        File file = new File("/sdcard", FILE_NAME);
+        try
+        {
+            file.createNewFile();
+            FileOutputStream fOut = new FileOutputStream(file);
+            OutputStreamWriter myOutWriter = new OutputStreamWriter(fOut);
+            myOutWriter.append(data);
+
+            myOutWriter.close();
+
+            fOut.flush();
+            fOut.close();
+        }
+        catch (IOException e)
+        {
+            Log.e(TAG, "File write failed: " + e.toString());
+        }
+    }
+}