USB: Add API and dialog for apps to request permissions for USB devices and accessories

New APIs:

UsbManager.hasPermission returns true if the caller has permission
for the given device or accessory

UsbManager.requestPermission poses a dialog to allow the user to give the caller
permission for the device or accessory.
Result is returned via a PendingIntent.
No dialog is displayed if the caller already has permission.

Also moved UsbResolverActivity to SystemUI package

BUG: 4069037

Change-Id: I93be769501a8776b49ac26e468af19f8fa2114c9

2 files changed, 265 insertions, 0 deletions

diff --git a/packages/SystemUI/src/com/android/systemui/usb/UsbPermissionActivity.java b/packages/SystemUI/src/com/android/systemui/usb/UsbPermissionActivity.java
new file mode 100644
index 0000000..92c6d3d
--- /dev/null
+++ b/packages/SystemUI/src/com/android/systemui/usb/UsbPermissionActivity.java
@@ -0,0 +1,164 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.systemui.usb;
+
+import android.app.Activity;
+import android.app.AlertDialog;
+import android.app.PendingIntent;
+import android.content.Context;
+import android.content.DialogInterface;
+import android.content.Intent;
+import android.content.pm.ApplicationInfo;
+import android.content.pm.PackageManager;
+import android.hardware.usb.IUsbManager;
+import android.hardware.usb.UsbDevice;
+import android.hardware.usb.UsbAccessory;
+import android.hardware.usb.UsbManager;
+import android.os.Bundle;
+import android.os.IBinder;
+import android.os.RemoteException;
+import android.os.ServiceManager;
+import android.util.Log;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.widget.CheckBox;
+import android.widget.CompoundButton;
+import android.widget.TextView;
+
+import com.android.internal.app.AlertActivity;
+import com.android.internal.app.AlertController;
+
+import com.android.systemui.R;
+
+public class UsbPermissionActivity extends AlertActivity
+        implements DialogInterface.OnClickListener, CheckBox.OnCheckedChangeListener {
+
+    private static final String TAG = "UsbPermissionActivity";
+
+    private CheckBox mAlwaysCheck;
+    private TextView mClearDefaultHint;
+    private UsbDevice mDevice;
+    private UsbAccessory mAccessory;
+    private PendingIntent mPendingIntent;
+    private String mPackageName;
+    private int mUid;
+    private boolean mPermissionGranted;
+
+    @Override
+    public void onCreate(Bundle icicle) {
+        super.onCreate(icicle);
+
+       Intent intent = getIntent();
+        mDevice = (UsbDevice)intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);
+        mAccessory = (UsbAccessory)intent.getParcelableExtra(UsbManager.EXTRA_ACCESSORY);
+        mPendingIntent = (PendingIntent)intent.getParcelableExtra(Intent.EXTRA_INTENT);
+        mUid = intent.getIntExtra("uid", 0);
+        mPackageName = intent.getStringExtra("package");
+
+        PackageManager packageManager = getPackageManager();
+        ApplicationInfo aInfo;
+        try {
+            aInfo = packageManager.getApplicationInfo(mPackageName, 0);
+        } catch (PackageManager.NameNotFoundException e) {
+            Log.e(TAG, "unable to look up package name", e);
+            finish();
+            return;
+        }
+        String appName = aInfo.loadLabel(packageManager).toString();
+
+        final AlertController.AlertParams ap = mAlertParams;
+        ap.mIcon = aInfo.loadIcon(packageManager);
+        ap.mTitle = appName;
+        if (mDevice == null) {
+            ap.mMessage = getString(R.string.usb_accessory_permission_prompt, appName);
+        } else {
+            ap.mMessage = getString(R.string.usb_device_permission_prompt, appName);
+        }
+        ap.mPositiveButtonText = getString(com.android.internal.R.string.ok);
+        ap.mNegativeButtonText = getString(com.android.internal.R.string.cancel);
+        ap.mPositiveButtonListener = this;
+        ap.mNegativeButtonListener = this;
+
+        // add "always use" checkbox
+        LayoutInflater inflater = (LayoutInflater)getSystemService(
+                Context.LAYOUT_INFLATER_SERVICE);
+        ap.mView = inflater.inflate(com.android.internal.R.layout.always_use_checkbox, null);
+        mAlwaysCheck = (CheckBox)ap.mView.findViewById(com.android.internal.R.id.alwaysUse);
+        mAlwaysCheck.setText(com.android.internal.R.string.alwaysUse);
+        mAlwaysCheck.setOnCheckedChangeListener(this);
+        mClearDefaultHint = (TextView)ap.mView.findViewById(
+                                                    com.android.internal.R.id.clearDefaultHint);
+        mClearDefaultHint.setVisibility(View.GONE);
+
+        setupAlert();
+
+    }
+
+    @Override
+    public void onDestroy() {
+        IBinder b = ServiceManager.getService(USB_SERVICE);
+        IUsbManager service = IUsbManager.Stub.asInterface(b);
+
+        // send response via pending intent
+        Intent intent = new Intent();
+        try {
+            if (mDevice != null) {
+                intent.putExtra(UsbManager.EXTRA_DEVICE, mDevice);
+                if (mPermissionGranted) {
+                    service.grantDevicePermission(mDevice, mUid);
+                    if (mAlwaysCheck.isChecked()) {
+                        service.setDevicePackage(mDevice, mPackageName);
+                    }
+                }
+            }
+            if (mAccessory != null) {
+                intent.putExtra(UsbManager.EXTRA_ACCESSORY, mAccessory);
+                if (mPermissionGranted) {
+                    service.grantAccessoryPermission(mAccessory, mUid);
+                    if (mAlwaysCheck.isChecked()) {
+                        service.setAccessoryPackage(mAccessory, mPackageName);
+                    }
+                }
+            }
+            intent.putExtra(UsbManager.EXTRA_PERMISSION_GRANTED, mPermissionGranted);
+            mPendingIntent.send(this, 0, intent);
+        } catch (PendingIntent.CanceledException e) {
+            Log.w(TAG, "PendingIntent was cancelled");
+        } catch (RemoteException e) {
+            Log.e(TAG, "IUsbService connection failed", e);
+        }
+
+        super.onDestroy();
+    }
+
+    public void onClick(DialogInterface dialog, int which) {
+        if (which == AlertDialog.BUTTON_POSITIVE) {
+            mPermissionGranted = true;
+        }
+        finish();
+    }
+
+    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
+        if (mClearDefaultHint == null) return;
+
+        if(isChecked) {
+            mClearDefaultHint.setVisibility(View.VISIBLE);
+        } else {
+            mClearDefaultHint.setVisibility(View.GONE);
+        }
+    }
+}
diff --git a/packages/SystemUI/src/com/android/systemui/usb/UsbResolverActivity.java b/packages/SystemUI/src/com/android/systemui/usb/UsbResolverActivity.java
new file mode 100644
index 0000000..1d7f70f
--- /dev/null
+++ b/packages/SystemUI/src/com/android/systemui/usb/UsbResolverActivity.java
@@ -0,0 +1,101 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.systemui.usb;
+
+import com.android.internal.app.ResolverActivity;
+
+import android.content.ActivityNotFoundException;
+import android.content.Intent;
+import android.content.pm.ResolveInfo;
+import android.hardware.usb.IUsbManager;
+import android.hardware.usb.UsbAccessory;
+import android.hardware.usb.UsbDevice;
+import android.hardware.usb.UsbManager;
+import android.os.Bundle;
+import android.os.IBinder;
+import android.os.Parcelable;
+import android.os.RemoteException;
+import android.os.ServiceManager;
+import android.util.Log;
+
+import java.util.ArrayList;
+
+/* Activity for choosing an application for a USB device or accessory */
+public class UsbResolverActivity extends ResolverActivity {
+    public static final String TAG = "UsbResolverActivity";
+    public static final String EXTRA_RESOLVE_INFOS = "rlist";
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        Intent intent = getIntent();
+        Parcelable targetParcelable = intent.getParcelableExtra(Intent.EXTRA_INTENT);
+        if (!(targetParcelable instanceof Intent)) {
+            Log.w("UsbResolverActivity", "Target is not an intent: " + targetParcelable);
+            finish();
+            return;
+        }
+        Intent target = (Intent)targetParcelable;
+        ArrayList<ResolveInfo> rList = intent.getParcelableArrayListExtra(EXTRA_RESOLVE_INFOS);
+        CharSequence title = getResources().getText(com.android.internal.R.string.chooseUsbActivity);
+        super.onCreate(savedInstanceState, target, title, null, rList,
+                true, /* Set alwaysUseOption to true to enable "always use this app" checkbox. */
+                true  /* Set alwaysChoose to display activity when only one choice is available.
+                         This is necessary because this activity is needed for the user to allow
+                         the application permission to access the device */
+                );
+    }
+
+    protected void onIntentSelected(ResolveInfo ri, Intent intent, boolean alwaysCheck) {
+        try {
+            IBinder b = ServiceManager.getService(USB_SERVICE);
+            IUsbManager service = IUsbManager.Stub.asInterface(b);
+            int uid = ri.activityInfo.applicationInfo.uid;
+            String action = intent.getAction();
+
+            if (UsbManager.ACTION_USB_DEVICE_ATTACHED.equals(action)) {
+                UsbDevice device = (UsbDevice)intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);
+                // grant permission for the device
+                service.grantDevicePermission(device, uid);
+                // set or clear default setting
+                if (alwaysCheck) {
+                    service.setDevicePackage(device, ri.activityInfo.packageName);
+                } else {
+                    service.setDevicePackage(device, null);
+                }
+            } else if (UsbManager.ACTION_USB_ACCESSORY_ATTACHED.equals(action)) {
+                UsbAccessory accessory = (UsbAccessory)intent.getParcelableExtra(
+                        UsbManager.EXTRA_ACCESSORY);
+                // grant permission for the accessory
+                service.grantAccessoryPermission(accessory, uid);
+                // set or clear default setting
+                if (alwaysCheck) {
+                    service.setAccessoryPackage(accessory, ri.activityInfo.packageName);
+                } else {
+                    service.setAccessoryPackage(accessory, null);
+                }
+            }
+
+            try {
+                startActivity(intent);
+            } catch (ActivityNotFoundException e) {
+                Log.e(TAG, "startActivity failed", e);
+            }
+        } catch (RemoteException e) {
+            Log.e(TAG, "onIntentSelected failed", e);
+        }
+    }
+}