Java tutorial
/* * Copyright (C) 2015 Dominik Schrmann <dominik@dominikschuermann.de> * * This program 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 of the License, or * (at your option) any later version. * * This program 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 this program. If not, see <http://www.gnu.org/licenses/>. */ package org.sufficientlysecure.keychain.gm; import android.accessibilityservice.AccessibilityService; import android.annotation.SuppressLint; import android.content.Context; import android.content.Intent; import android.graphics.PixelFormat; import android.graphics.Point; import android.graphics.Rect; import android.net.Uri; import android.support.annotation.Nullable; import android.support.v4.view.ViewCompat; import android.text.TextUtils; import android.util.Log; import android.util.TypedValue; import android.view.ContextThemeWrapper; import android.view.Display; import android.view.Gravity; import android.view.LayoutInflater; import android.view.View; import android.view.WindowManager; import android.view.accessibility.AccessibilityEvent; import android.view.accessibility.AccessibilityNodeInfo; import android.widget.Button; import android.widget.FrameLayout; import android.widget.ImageButton; import org.sufficientlysecure.keychain.intents.OpenKeychainIntents; import java.io.IOException; import java.io.OutputStream; import java.util.ArrayList; public class GmAccessibilityService extends AccessibilityService { private static final String WEB_VIEW_CLASS_NAME = "android.webkit.WebView"; private static final String VIEW_CLASS_NAME = "android.view.View"; private static final String BEGIN_PGP_MESSAGE = "-----BEGIN PGP MESSAGE-----"; private static final String END_PGP_MESSAGE = "-----END PGP MESSAGE-----"; private static final int CHECKSUM_LENGTH = 5; private WindowManager mWindowManager; private FrameLayout mOverlay; /** * {@inheritDoc} */ @Override public void onServiceConnected() { if (mWindowManager == null) { mWindowManager = (WindowManager) getSystemService(WINDOW_SERVICE); } } @Override public void onAccessibilityEvent(AccessibilityEvent event) { if (!(AccessibilityEvent.TYPE_WINDOW_CONTENT_CHANGED == event.getEventType())) { return; } Log.d(Constants.TAG, "TYPE_WINDOW_CONTENT_CHANGED"); // This AccessibilityNodeInfo represents the view that fired the // AccessibilityEvent. The following code will use it to traverse the // view hierarchy, using this node as a starting point. // // NOTE: Every method that returns an AccessibilityNodeInfo may return null, // because the explored window is in another process and the // corresponding View might be gone by the time your request reaches the // view hierarchy. // AccessibilityNodeInfo source = event.getSource(); // TODO: start with "com.google.android.gm:id/conversation" ? AccessibilityNodeInfo source = getRootInActiveWindow(); if (source == null) { return; } closeOverlay(); ArrayList<AccessibilityNodeInfo> pgpNodes = new ArrayList<>(); findPgpNodeInfo(source, pgpNodes); for (final AccessibilityNodeInfo node : pgpNodes) { Log.d(Constants.TAG, "node=" + node); drawOverlay(node, new View.OnClickListener() { @Override public void onClick(View v) { decryptWithOpenKeychain(node); } }); } } private void decryptWithOpenKeychain(AccessibilityNodeInfo node) { closeOverlay(); try { Uri dateUri = readToTempFile(fixContentDescription(node)); Intent i = new Intent(OpenKeychainIntents.DECRYPT_DATA); i.setPackage(Constants.OPEN_KEYCHAIN_PACKAGE_NAME); i.setData(dateUri); i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TOP); startActivity(i); } catch (IOException e) { Log.e(Constants.TAG, "read to temp failed!", e); } } @Nullable public Uri readToTempFile(String text) throws IOException { Uri tempFile = TemporaryStorageProvider.createFile(this); OutputStream outStream = getContentResolver().openOutputStream(tempFile); if (outStream == null) { return null; } outStream.write(text.getBytes()); outStream.close(); return tempFile; } private String fixContentDescription(AccessibilityNodeInfo node) { String content = node.getContentDescription().toString(); // NOTE: Unfortunately, line breaks are missing from content description, thus // we are reformatting now: // TODO: get charset from header? // find "hQ", start of pgp message (0x80 byte) and remove everything before content = content.replaceFirst(".*hQ", "hQ"); StringBuilder builder = new StringBuilder(content); // re-add -----BEGIN PGP MESSAGE----- String header = BEGIN_PGP_MESSAGE + "\n\n"; builder.insert(0, header); int indexOfEnd = builder.lastIndexOf(END_PGP_MESSAGE); // TODO: check if END pgp message is really inside string! if not -> gmail has cut it! builder.insert(indexOfEnd, "\n"); int i = indexOfEnd - CHECKSUM_LENGTH; builder.insert(i, "\n"); // split into 65 character chunks int currentIndex = header.length() + 64; while (currentIndex < indexOfEnd) { builder.insert(currentIndex, "\n"); currentIndex += 65; // stop where checksum starts indexOfEnd = builder.lastIndexOf(END_PGP_MESSAGE) - CHECKSUM_LENGTH - 2; } content = builder.toString(); if (Constants.DEBUG) { // split for long messages for (String line : content.split("\n")) { Log.d(Constants.TAG, line); } } return content; } @SuppressLint("RtlHardcoded") private void drawOverlay(AccessibilityNodeInfo node, View.OnClickListener onClickListener) { mOverlay = new FrameLayout(this); // must be encapsulated into FrameLayout for animation FrameLayout mAnimatedChild = new FrameLayout(this); LayoutInflater systemInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE); final Context contextThemeWrapper = new ContextThemeWrapper(this, R.style.FixedBottomSheetTheme); LayoutInflater inflater = systemInflater.cloneInContext(contextThemeWrapper); View child = inflater.inflate(R.layout.fixed_bottom_sheet, null); mAnimatedChild.addView(child); Button b = (Button) child.findViewById(R.id.fixed_bottom_sheet_button); b.setText(R.string.decrypt_with_openkeychain); b.setOnClickListener(onClickListener); ImageButton close = (ImageButton) child.findViewById(R.id.fixed_bottom_sheet_close); close.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { closeOverlay(); } }); Rect webviewRect = new Rect(); node.getBoundsInScreen(webviewRect); Display display = mWindowManager.getDefaultDisplay(); Rect displayRect = new Rect(); display.getRectSize(displayRect); int xpos = webviewRect.left; int ypos = webviewRect.top - getStatusBarHeight() < getToolbarHeight() ? getToolbarHeight() : webviewRect.top - getStatusBarHeight(); int width = webviewRect.width(); int height = webviewRect.bottom < displayRect.height() ? webviewRect.bottom - getToolbarHeight() - getStatusBarHeight() : displayRect.height() - ypos - getStatusBarHeight(); WindowManager.LayoutParams params = new WindowManager.LayoutParams(width, height, xpos, ypos, WindowManager.LayoutParams.TYPE_SYSTEM_ALERT, WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE | WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL, PixelFormat.TRANSLUCENT); params.gravity = Gravity.TOP | Gravity.LEFT; params.windowAnimations = R.style.OverlayAnimation; mWindowManager.addView(mOverlay, params); mOverlay.addView(mAnimatedChild); } public int getToolbarHeight() { TypedValue tv = new TypedValue(); getTheme().resolveAttribute(android.R.attr.actionBarSize, tv, true); return getResources().getDimensionPixelSize(tv.resourceId); } public int getStatusBarHeight() { int result = 0; int resourceId = getResources().getIdentifier("status_bar_height", "dimen", "android"); if (resourceId > 0) { result = getResources().getDimensionPixelSize(resourceId); } return result; } private void findPgpNodeInfo(AccessibilityNodeInfo parent, ArrayList<AccessibilityNodeInfo> pgpNodes) { for (int i = 0; i < parent.getChildCount(); i++) { AccessibilityNodeInfo currentChild = parent.getChild(i); /* WebView |- WebView |- View |- View |- View */ if (WEB_VIEW_CLASS_NAME.equals(parent.getClassName()) && VIEW_CLASS_NAME.equals(currentChild.getClassName()) && !TextUtils.isEmpty(currentChild.getContentDescription()) && currentChild.getContentDescription().toString().startsWith(BEGIN_PGP_MESSAGE)) { pgpNodes.add(currentChild); } else { // recursive traversal findPgpNodeInfo(currentChild, pgpNodes); currentChild.recycle(); } } } /** * {@inheritDoc} */ @Override public void onInterrupt() { /* do nothing */ } /** * {@inheritDoc} */ @Override public void onDestroy() { super.onDestroy(); closeOverlay(); } private void closeOverlay() { if (mOverlay != null && ViewCompat.isAttachedToWindow(mOverlay)) { mWindowManager.removeView(mOverlay); mOverlay = null; } } }