From bd2906a887f22c415f9b194481607660db2216f6 Mon Sep 17 00:00:00 2001
From: Nikita Mikhailov <nikita.s.mikhailov@gmail.com>
Date: Mon, 4 Apr 2016 00:33:59 +0600
Subject: OTG: Add usb device manager prototype

---
 .../keychain/javacard/UsbConnectionManager.java    | 135 +++++++++++++++++++++
 1 file changed, 135 insertions(+)
 create mode 100644 OpenKeychain/src/main/java/org/sufficientlysecure/keychain/javacard/UsbConnectionManager.java

(limited to 'OpenKeychain/src/main/java/org/sufficientlysecure/keychain/javacard/UsbConnectionManager.java')

diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/javacard/UsbConnectionManager.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/javacard/UsbConnectionManager.java
new file mode 100644
index 000000000..d140c771c
--- /dev/null
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/javacard/UsbConnectionManager.java
@@ -0,0 +1,135 @@
+package org.sufficientlysecure.keychain.javacard;
+
+import android.app.Activity;
+import android.app.PendingIntent;
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.hardware.usb.UsbDevice;
+import android.hardware.usb.UsbManager;
+
+import org.sufficientlysecure.keychain.Constants;
+import org.sufficientlysecure.keychain.util.Log;
+
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.Semaphore;
+
+public class UsbConnectionManager {
+    private static final String LOG_TAG = UsbConnectionManager.class.getName();
+    private static final String ACTION_USB_PERMISSION = Constants.PACKAGE_NAME + ".USB_PERMITSSION";
+
+    private Activity mActivity;
+    private OnDiscoveredUsbDeviceListener mListener;
+    private final Semaphore mRunning = new Semaphore(1);
+    private final Set<UsbDevice> mProcessedDevices = Collections.newSetFromMap(new ConcurrentHashMap<UsbDevice, Boolean>());
+
+    /**
+     * Receives broadcast when a supported USB device is attached, detached or
+     * when a permission to communicate to the device has been granted.
+     */
+    private final BroadcastReceiver mUsbReceiver = new BroadcastReceiver() {
+        @Override
+        public void onReceive(Context context, Intent intent) {
+            String action = intent.getAction();
+            UsbDevice usbDevice = (UsbDevice) intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);
+            String deviceName = usbDevice.getDeviceName();
+
+            if (ACTION_USB_PERMISSION.equals(action)) {
+                boolean permission = intent.getBooleanExtra(UsbManager.EXTRA_PERMISSION_GRANTED,
+                        false);
+                Log.d(LOG_TAG, "ACTION_USB_PERMISSION: " + permission + " Device: " + deviceName);
+
+                interceptIntent(intent);
+
+                context.unregisterReceiver(mUsbReceiver);
+            }
+        }
+    };
+
+    private final Thread mWatchThread = new Thread() {
+        @Override
+        public void run() {
+            final UsbManager usbManager = (UsbManager) mActivity.getSystemService(Context.USB_SERVICE);
+
+            while (true) {
+                mRunning.acquireUninterruptibly();
+                mRunning.release();
+
+                //
+
+                final UsbDevice device = getDevice(usbManager);
+                if (device != null && !mProcessedDevices.contains(device)) {
+                    mProcessedDevices.add(device);
+
+                    final Intent intent = new Intent(ACTION_USB_PERMISSION);
+
+                    IntentFilter filter = new IntentFilter();
+                    filter.addAction(ACTION_USB_PERMISSION);
+                    mActivity.registerReceiver(mUsbReceiver, filter);
+
+                    usbManager.requestPermission(device, PendingIntent.getBroadcast(mActivity, 0, intent, 0));
+                }
+
+                try {
+                    sleep(1000);
+                } catch (InterruptedException ignored) {
+                }
+            }
+        }
+    };
+
+    public UsbConnectionManager(final Activity activity, final OnDiscoveredUsbDeviceListener listener) {
+        this.mActivity = activity;
+        this.mListener = listener;
+        mRunning.acquireUninterruptibly();
+        mWatchThread.start();
+    }
+
+    public void startListeningForDevices() {
+        mRunning.release();
+    }
+
+    public void stopListeningForDevices() {
+        mRunning.acquireUninterruptibly();
+    }
+
+    public void interceptIntent(final Intent intent) {
+        if (intent == null || intent.getAction() == null) return;
+        switch (intent.getAction()) {
+            case UsbManager.ACTION_USB_DEVICE_ATTACHED: {
+                final UsbManager usbManager = (UsbManager) mActivity.getSystemService(Context.USB_SERVICE);
+                final UsbDevice device = intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);
+                Intent usbI = new Intent(mActivity, getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP | Intent.FLAG_ACTIVITY_CLEAR_TOP);
+                usbI.setAction(ACTION_USB_PERMISSION);
+                usbI.putExtra(UsbManager.EXTRA_DEVICE, device);
+                PendingIntent pi = PendingIntent.getActivity(mActivity, 0, usbI, PendingIntent.FLAG_CANCEL_CURRENT);
+                usbManager.requestPermission(device, pi);
+                break;
+            }
+            case ACTION_USB_PERMISSION: {
+                UsbDevice device = intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);
+                if (device != null)
+                    mListener.usbDeviceDiscovered(device);
+                break;
+            }
+            default:
+                break;
+        }
+    }
+
+    private static UsbDevice getDevice(UsbManager manager) {
+        HashMap<String, UsbDevice> deviceList = manager.getDeviceList();
+        for (UsbDevice device : deviceList.values()) {
+            Log.d(LOG_TAG, device.getDeviceName() + " " + device.getDeviceId());
+            if (device.getVendorId() == 0x1050 && device.getProductId() == 0x0112) {
+                Log.d(LOG_TAG, device.getDeviceName() + " OK");
+                return device;
+            }
+        }
+        return null;
+    }
+}
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