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/*
* Copyright (C) 2010 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.browser;
import android.app.Activity;
import android.content.ActivityNotFoundException;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.database.Cursor;
import android.net.Uri;
import android.os.AsyncTask;
import android.provider.Browser;
import android.util.Log;
import android.webkit.WebView;
import java.net.URISyntaxException;
import java.util.List;
import java.util.regex.Matcher;
/**
*
*/
public class UrlHandler {
static final String RLZ_PROVIDER = "com.google.android.partnersetup.rlzappprovider";
static final Uri RLZ_PROVIDER_URI = Uri.parse("content://" + RLZ_PROVIDER + "/");
// Use in overrideUrlLoading
/* package */ final static String SCHEME_WTAI = "wtai://wp/";
/* package */ final static String SCHEME_WTAI_MC = "wtai://wp/mc;";
/* package */ final static String SCHEME_WTAI_SD = "wtai://wp/sd;";
/* package */ final static String SCHEME_WTAI_AP = "wtai://wp/ap;";
Controller mController;
Activity mActivity;
private Boolean mIsProviderPresent = null;
private Uri mRlzUri = null;
public UrlHandler(Controller controller) {
mController = controller;
mActivity = mController.getActivity();
}
boolean shouldOverrideUrlLoading(Tab tab, WebView view, String url) {
if (view.isPrivateBrowsingEnabled()) {
// Don't allow urls to leave the browser app when in
// private browsing mode
return false;
}
if (url.startsWith(SCHEME_WTAI)) {
// wtai://wp/mc;number
// number=string(phone-number)
if (url.startsWith(SCHEME_WTAI_MC)) {
Intent intent = new Intent(Intent.ACTION_VIEW,
Uri.parse(WebView.SCHEME_TEL +
url.substring(SCHEME_WTAI_MC.length())));
mActivity.startActivity(intent);
// before leaving BrowserActivity, close the empty child tab.
// If a new tab is created through JavaScript open to load this
// url, we would like to close it as we will load this url in a
// different Activity.
mController.closeEmptyTab();
return true;
}
// wtai://wp/sd;dtmf
// dtmf=string(dialstring)
if (url.startsWith(SCHEME_WTAI_SD)) {
// TODO: only send when there is active voice connection
return false;
}
// wtai://wp/ap;number;name
// number=string(phone-number)
// name=string
if (url.startsWith(SCHEME_WTAI_AP)) {
// TODO
return false;
}
}
// The "about:" schemes are internal to the browser; don't want these to
// be dispatched to other apps.
if (url.startsWith("about:")) {
return false;
}
// If this is a Google search, attempt to add an RLZ string
// (if one isn't already present).
if (rlzProviderPresent()) {
Uri siteUri = Uri.parse(url);
if (needsRlzString(siteUri)) {
// Need to look up the RLZ info from a database, so do it in an
// AsyncTask. Although we are not overriding the URL load synchronously,
// we guarantee that we will handle this URL load after the task executes,
// so it's safe to just return true to WebCore now to stop its own loading.
new RLZTask(tab, siteUri, view).execute();
return true;
}
}
if (startActivityForUrl(tab, url)) {
return true;
}
if (handleMenuClick(tab, url)) {
return true;
}
return false;
}
boolean startActivityForUrl(Tab tab, String url) {
Intent intent;
// perform generic parsing of the URI to turn it into an Intent.
try {
intent = Intent.parseUri(url, Intent.URI_INTENT_SCHEME);
} catch (URISyntaxException ex) {
Log.w("Browser", "Bad URI " + url + ": " + ex.getMessage());
return false;
}
// check whether the intent can be resolved. If not, we will see
// whether we can download it from the Market.
if (mActivity.getPackageManager().resolveActivity(intent, 0) == null) {
String packagename = intent.getPackage();
if (packagename != null) {
intent = new Intent(Intent.ACTION_VIEW, Uri
.parse("market://search?q=pname:" + packagename));
intent.addCategory(Intent.CATEGORY_BROWSABLE);
mActivity.startActivity(intent);
// before leaving BrowserActivity, close the empty child tab.
// If a new tab is created through JavaScript open to load this
// url, we would like to close it as we will load this url in a
// different Activity.
mController.closeEmptyTab();
return true;
} else {
return false;
}
}
// sanitize the Intent, ensuring web pages can not bypass browser
// security (only access to BROWSABLE activities).
intent.addCategory(Intent.CATEGORY_BROWSABLE);
intent.setComponent(null);
// Re-use the existing tab if the intent comes back to us
if (tab != null) {
if (tab.getAppId() == null) {
tab.setAppId(mActivity.getPackageName() + "-" + tab.getId());
}
intent.putExtra(Browser.EXTRA_APPLICATION_ID, tab.getAppId());
}
// Make sure webkit can handle it internally before checking for specialized
// handlers. If webkit can't handle it internally, we need to call
// startActivityIfNeeded
Matcher m = UrlUtils.ACCEPTED_URI_SCHEMA.matcher(url);
if (m.matches() && !isSpecializedHandlerAvailable(intent)) {
return false;
}
try {
intent.putExtra(BrowserActivity.EXTRA_DISABLE_URL_OVERRIDE, true);
if (mActivity.startActivityIfNeeded(intent, -1)) {
// before leaving BrowserActivity, close the empty child tab.
// If a new tab is created through JavaScript open to load this
// url, we would like to close it as we will load this url in a
// different Activity.
mController.closeEmptyTab();
return true;
}
} catch (ActivityNotFoundException ex) {
// ignore the error. If no application can handle the URL,
// eg about:blank, assume the browser can handle it.
}
return false;
}
/**
* Search for intent handlers that are specific to this URL
* aka, specialized apps like google maps or youtube
*/
private boolean isSpecializedHandlerAvailable(Intent intent) {
PackageManager pm = mActivity.getPackageManager();
List<ResolveInfo> handlers = pm.queryIntentActivities(intent,
PackageManager.GET_RESOLVED_FILTER);
if (handlers == null || handlers.size() == 0) {
return false;
}
for (ResolveInfo resolveInfo : handlers) {
IntentFilter filter = resolveInfo.filter;
if (filter == null) {
// No intent filter matches this intent?
// Error on the side of staying in the browser, ignore
continue;
}
if (filter.countDataAuthorities() == 0 && filter.countDataPaths() == 0) {
// Generic handler, skip
continue;
}
return true;
}
return false;
}
// In case a physical keyboard is attached, handle clicks with the menu key
// depressed by opening in a new tab
boolean handleMenuClick(Tab tab, String url) {
if (mController.isMenuDown()) {
mController.openTab(url,
(tab != null) && tab.isPrivateBrowsingEnabled(),
!BrowserSettings.getInstance().openInBackground(), true);
mActivity.closeOptionsMenu();
return true;
}
return false;
}
// TODO: Move this class into Tab, where it can be properly stopped upon
// closure of the tab
private class RLZTask extends AsyncTask<Void, Void, String> {
private Tab mTab;
private Uri mSiteUri;
private WebView mWebView;
public RLZTask(Tab tab, Uri uri, WebView webView) {
mTab = tab;
mSiteUri = uri;
mWebView = webView;
}
protected String doInBackground(Void... unused) {
String result = mSiteUri.toString();
Cursor cur = null;
try {
cur = mActivity.getContentResolver()
.query(getRlzUri(), null, null, null, null);
if (cur != null && cur.moveToFirst() && !cur.isNull(0)) {
result = mSiteUri.buildUpon()
.appendQueryParameter("rlz", cur.getString(0))
.build().toString();
}
} finally {
if (cur != null) {
cur.close();
}
}
return result;
}
protected void onPostExecute(String result) {
// abort if we left browser already
if (mController.isActivityPaused()) return;
// Make sure the Tab was not closed while handling the task
if (mController.getTabControl().getTabPosition(mTab) != -1) {
// If the Activity Manager is not invoked, load the URL directly
if (!startActivityForUrl(mTab, result)) {
if (!handleMenuClick(mTab, result)) {
mController.loadUrl(mTab, result);
}
}
}
}
}
// Determine whether the RLZ provider is present on the system.
private boolean rlzProviderPresent() {
if (mIsProviderPresent == null) {
PackageManager pm = mActivity.getPackageManager();
mIsProviderPresent = pm.resolveContentProvider(RLZ_PROVIDER, 0) != null;
}
return mIsProviderPresent;
}
// Retrieve the RLZ access point string and cache the URI used to
// retrieve RLZ values.
private Uri getRlzUri() {
if (mRlzUri == null) {
String ap = mActivity.getResources()
.getString(R.string.rlz_access_point);
mRlzUri = Uri.withAppendedPath(RLZ_PROVIDER_URI, ap);
}
return mRlzUri;
}
// Determine if this URI appears to be for a Google search
// and does not have an RLZ parameter.
// Taken largely from Chrome source, src/chrome/browser/google_url_tracker.cc
private static boolean needsRlzString(Uri uri) {
String scheme = uri.getScheme();
if (("http".equals(scheme) || "https".equals(scheme)) &&
(uri.getQueryParameter("q") != null) &&
(uri.getQueryParameter("rlz") == null)) {
String host = uri.getHost();
if (host == null) {
return false;
}
String[] hostComponents = host.split("\\.");
if (hostComponents.length < 2) {
return false;
}
int googleComponent = hostComponents.length - 2;
String component = hostComponents[googleComponent];
if (!"google".equals(component)) {
if (hostComponents.length < 3 ||
(!"co".equals(component) && !"com".equals(component))) {
return false;
}
googleComponent = hostComponents.length - 3;
if (!"google".equals(hostComponents[googleComponent])) {
return false;
}
}
// Google corp network handling.
if (googleComponent > 0 && "corp".equals(
hostComponents[googleComponent - 1])) {
return false;
}
return true;
}
return false;
}
}