android/packageinstaller/PackageInstallerActivity.java

/*
**
** Copyright 2007, 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.packageinstaller;

import android.app.Activity;
import android.app.ActivityManagerNative;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnCancelListener;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.pm.ApplicationInfo;
import android.content.pm.ManifestDigest;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.content.pm.PackageParser;
import android.content.pm.PackageUserState;
import android.content.pm.VerificationParams;
import android.net.Uri;
import android.os.Bundle;
import android.provider.Settings;
import android.support.v4.view.ViewPager;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AppSecurityPermissions;
import android.widget.Button;
import android.widget.TabHost;
import android.widget.TextView;

import java.io.File;

/*
 * This activity is launched when a new application is installed via side loading
 * The package is first parsed and the user is notified of parse errors via a dialog.
 * If the package is successfully parsed, the user is notified to turn on the install unknown
 * applications setting. A memory check is made at this point and the user is notified of out
 * of memory conditions if any. If the package is already existing on the device,
 * a confirmation dialog (to replace the existing package) is presented to the user.
 * Based on the user response the package is then installed by launching InstallAppConfirm
 * sub activity. All state transitions are handled in this activity
 */
public class PackageInstallerActivity extends Activity implements OnCancelListener, OnClickListener {
    private static final String TAG = "PackageInstaller";
    private Uri mPackageURI;
    private Uri mOriginatingURI;
    private Uri mReferrerURI;
    private int mOriginatingUid = VerificationParams.NO_UID;
    private ManifestDigest mPkgDigest;

    private boolean localLOGV = false;
    PackageManager mPm;
    PackageInfo mPkgInfo;
    ApplicationInfo mSourceInfo;

    // ApplicationInfo object primarily used for already existing applications
    private ApplicationInfo mAppInfo = null;

    // View for install progress
    View mInstallConfirm;
    // Buttons to indicate user acceptance
    private Button mOk;
    private Button mCancel;
    CaffeinatedScrollView mScrollView = null;
    private boolean mOkCanInstall = false;

    static final String PREFS_ALLOWED_SOURCES = "allowed_sources";

    // Dialog identifiers used in showDialog
    private static final int DLG_BASE = 0;
    private static final int DLG_UNKNOWN_APPS = DLG_BASE + 1;
    private static final int DLG_PACKAGE_ERROR = DLG_BASE + 2;
    private static final int DLG_OUT_OF_SPACE = DLG_BASE + 3;
    private static final int DLG_INSTALL_ERROR = DLG_BASE + 4;
    private static final int DLG_ALLOW_SOURCE = DLG_BASE + 5;

    private void startInstallConfirm() {
        TabHost tabHost = (TabHost)findViewById(android.R.id.tabhost);
        tabHost.setup();
        ViewPager viewPager = (ViewPager)findViewById(R.id.pager);
        TabsAdapter adapter = new TabsAdapter(this, tabHost, viewPager);

        boolean permVisible = false;
        mScrollView = null;
        mOkCanInstall = false;
        int msg = 0;
        if (mPkgInfo != null) {
            AppSecurityPermissions perms = new AppSecurityPermissions(this, mPkgInfo);
            final int NP = perms.getPermissionCount(AppSecurityPermissions.WHICH_PERSONAL);
            final int ND = perms.getPermissionCount(AppSecurityPermissions.WHICH_DEVICE);
            if (mAppInfo != null) {
                msg = (mAppInfo.flags & ApplicationInfo.FLAG_SYSTEM) != 0
                        ? R.string.install_confirm_question_update_system
                        : R.string.install_confirm_question_update;
                mScrollView = new CaffeinatedScrollView(this);
                mScrollView.setFillViewport(true);
                if (perms.getPermissionCount(AppSecurityPermissions.WHICH_NEW) > 0) {
                    permVisible = true;
                    mScrollView.addView(perms.getPermissionsView(
                            AppSecurityPermissions.WHICH_NEW));
                } else {
                    LayoutInflater inflater = (LayoutInflater)getSystemService(
                            Context.LAYOUT_INFLATER_SERVICE);
                    TextView label = (TextView)inflater.inflate(R.layout.label, null);
                    label.setText(R.string.no_new_perms);
                    mScrollView.addView(label);
                }
                adapter.addTab(tabHost.newTabSpec("new").setIndicator(
                        getText(R.string.newPerms)), mScrollView);
            } else  {
                findViewById(R.id.tabscontainer).setVisibility(View.GONE);
                findViewById(R.id.divider).setVisibility(View.VISIBLE);
            }
            if (NP > 0 || ND > 0) {
                permVisible = true;
                LayoutInflater inflater = (LayoutInflater)getSystemService(
                        Context.LAYOUT_INFLATER_SERVICE);
                View root = inflater.inflate(R.layout.permissions_list, null);
                if (mScrollView == null) {
                    mScrollView = (CaffeinatedScrollView)root.findViewById(R.id.scrollview);
                }
                if (NP > 0) {
                    ((ViewGroup)root.findViewById(R.id.privacylist)).addView(
                            perms.getPermissionsView(AppSecurityPermissions.WHICH_PERSONAL));
                } else {
                    root.findViewById(R.id.privacylist).setVisibility(View.GONE);
                }
                if (ND > 0) {
                    ((ViewGroup)root.findViewById(R.id.devicelist)).addView(
                            perms.getPermissionsView(AppSecurityPermissions.WHICH_DEVICE));
                } else {
                    root.findViewById(R.id.devicelist).setVisibility(View.GONE);
                }
                adapter.addTab(tabHost.newTabSpec("all").setIndicator(
                        getText(R.string.allPerms)), root);
            }
        }
        if (!permVisible) {
            if (mAppInfo != null) {
                // This is an update to an application, but there are no
                // permissions at all.
                msg = (mAppInfo.flags & ApplicationInfo.FLAG_SYSTEM) != 0
                        ? R.string.install_confirm_question_update_system_no_perms
                        : R.string.install_confirm_question_update_no_perms;
            } else {
                // This is a new application with no permissions.
                msg = R.string.install_confirm_question_no_perms;
            }
            tabHost.setVisibility(View.GONE);
            findViewById(R.id.filler).setVisibility(View.VISIBLE);
            findViewById(R.id.divider).setVisibility(View.GONE);
            mScrollView = null;
        }
        if (msg != 0) {
            ((TextView)findViewById(R.id.install_confirm_question)).setText(msg);
        }
        mInstallConfirm.setVisibility(View.VISIBLE);
        mOk = (Button)findViewById(R.id.ok_button);
        mCancel = (Button)findViewById(R.id.cancel_button);
        mOk.setOnClickListener(this);
        mCancel.setOnClickListener(this);
        if (mScrollView == null) {
            // There is nothing to scroll view, so the ok button is immediately
            // set to install.
            mOk.setText(R.string.install);
            mOkCanInstall = true;
        } else {
            mScrollView.setFullScrollAction(new Runnable() {
                @Override
                public void run() {
                    mOk.setText(R.string.install);
                    mOkCanInstall = true;
                }
            });
        }
    }

    private void showDialogInner(int id) {
        // TODO better fix for this? Remove dialog so that it gets created again
        removeDialog(id);
        showDialog(id);
    }

    @Override
    public Dialog onCreateDialog(int id, Bundle bundle) {
        switch (id) {
        case DLG_UNKNOWN_APPS:
            return new AlertDialog.Builder(this)
                    .setTitle(R.string.unknown_apps_dlg_title)
                    .setMessage(R.string.unknown_apps_dlg_text)
                    .setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int which) {
                            Log.i(TAG, "Finishing off activity so that user can navigate to settings manually");
                            finish();
                        }})
                    .setPositiveButton(R.string.settings, new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int which) {
                            Log.i(TAG, "Launching settings");
                            launchSettingsAppAndFinish();
                        }
                    })
                    .setOnCancelListener(this)
                    .create();
        case DLG_PACKAGE_ERROR :
            return new AlertDialog.Builder(this)
                    .setTitle(R.string.Parse_error_dlg_title)
                    .setMessage(R.string.Parse_error_dlg_text)
                    .setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int which) {
                            finish();
                        }
                    })
                    .setOnCancelListener(this)
                    .create();
        case DLG_OUT_OF_SPACE:
            // Guaranteed not to be null. will default to package name if not set by app
            CharSequence appTitle = mPm.getApplicationLabel(mPkgInfo.applicationInfo);
            String dlgText = getString(R.string.out_of_space_dlg_text,
                    appTitle.toString());
            return new AlertDialog.Builder(this)
                    .setTitle(R.string.out_of_space_dlg_title)
                    .setMessage(dlgText)
                    .setPositiveButton(R.string.manage_applications, new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int which) {
                            //launch manage applications
                            Intent intent = new Intent("android.intent.action.MANAGE_PACKAGE_STORAGE");
                            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                            startActivity(intent);
                            finish();
                        }
                    })
                    .setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int which) {
                            Log.i(TAG, "Canceling installation");
                            finish();
                        }
                  })
                  .setOnCancelListener(this)
                  .create();
        case DLG_INSTALL_ERROR :
            // Guaranteed not to be null. will default to package name if not set by app
            CharSequence appTitle1 = mPm.getApplicationLabel(mPkgInfo.applicationInfo);
            String dlgText1 = getString(R.string.install_failed_msg,
                    appTitle1.toString());
            return new AlertDialog.Builder(this)
                    .setTitle(R.string.install_failed)
                    .setNeutralButton(R.string.ok, new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int which) {
                            finish();
                        }
                    })
                    .setMessage(dlgText1)
                    .setOnCancelListener(this)
                    .create();
        case DLG_ALLOW_SOURCE:
            CharSequence appTitle2 = mPm.getApplicationLabel(mSourceInfo);
            String dlgText2 = getString(R.string.allow_source_dlg_text,
                    appTitle2.toString());
            return new AlertDialog.Builder(this)
                    .setTitle(R.string.allow_source_dlg_title)
                    .setMessage(dlgText2)
                    .setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int which) {
                            setResult(RESULT_CANCELED);
                            finish();
                        }})
                    .setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int which) {
                            SharedPreferences prefs = getSharedPreferences(PREFS_ALLOWED_SOURCES,
                                    Context.MODE_PRIVATE);
                            prefs.edit().putBoolean(mSourceInfo.packageName, true).apply();
                            startInstallConfirm();
                        }
                    })
                    .setOnCancelListener(this)
                    .create();
       }
       return null;
   }

    private void launchSettingsAppAndFinish() {
        // Create an intent to launch SettingsTwo activity
        Intent launchSettingsIntent = new Intent(Settings.ACTION_SECURITY_SETTINGS);
        launchSettingsIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        startActivity(launchSettingsIntent);
        finish();
    }

    private boolean isInstallingUnknownAppsAllowed() {
        return Settings.Global.getInt(getContentResolver(),
            Settings.Global.INSTALL_NON_MARKET_APPS, 0) > 0;
    }

    private void initiateInstall() {
        String pkgName = mPkgInfo.packageName;
        // Check if there is already a package on the device with this name
        // but it has been renamed to something else.
        String[] oldName = mPm.canonicalToCurrentPackageNames(new String[] { pkgName });
        if (oldName != null && oldName.length > 0 && oldName[0] != null) {
            pkgName = oldName[0];
            mPkgInfo.packageName = pkgName;
            mPkgInfo.applicationInfo.packageName = pkgName;
        }
        // Check if package is already installed. display confirmation dialog if replacing pkg
        try {
            // This is a little convoluted because we want to get all uninstalled
            // apps, but this may include apps with just data, and if it is just
            // data we still want to count it as "installed".
            mAppInfo = mPm.getApplicationInfo(pkgName,
                    PackageManager.GET_UNINSTALLED_PACKAGES);
            if ((mAppInfo.flags&ApplicationInfo.FLAG_INSTALLED) == 0) {
                mAppInfo = null;
            }
        } catch (NameNotFoundException e) {
            mAppInfo = null;
        }
        startInstallConfirm();
    }

    void setPmResult(int pmResult) {
        Intent result = new Intent();
        result.putExtra(Intent.EXTRA_INSTALL_RESULT, pmResult);
        setResult(pmResult == PackageManager.INSTALL_SUCCEEDED
                ? RESULT_OK : RESULT_FIRST_USER, result);
    }

    @Override
    protected void onCreate(Bundle icicle) {
        super.onCreate(icicle);

        // get intent information
        final Intent intent = getIntent();
        mPackageURI = intent.getData();
        mOriginatingURI = intent.getParcelableExtra(Intent.EXTRA_ORIGINATING_URI);
        mReferrerURI = intent.getParcelableExtra(Intent.EXTRA_REFERRER);
        mPm = getPackageManager();

        final String scheme = mPackageURI.getScheme();
        if (scheme != null && !"file".equals(scheme) && !"package".equals(scheme)) {
            Log.w(TAG, "Unsupported scheme " + scheme);
            setPmResult(PackageManager.INSTALL_FAILED_INVALID_URI);
            return;
        }

        final PackageUtil.AppSnippet as;
        if ("package".equals(mPackageURI.getScheme())) {
            try {
                mPkgInfo = mPm.getPackageInfo(mPackageURI.getSchemeSpecificPart(),
                        PackageManager.GET_PERMISSIONS | PackageManager.GET_UNINSTALLED_PACKAGES);
            } catch (NameNotFoundException e) {
            }
            if (mPkgInfo == null) {
                Log.w(TAG, "Requested package " + mPackageURI.getScheme()
                        + " not available. Discontinuing installation");
                showDialogInner(DLG_PACKAGE_ERROR);
                setPmResult(PackageManager.INSTALL_FAILED_INVALID_APK);
                return;
            }
            as = new PackageUtil.AppSnippet(mPm.getApplicationLabel(mPkgInfo.applicationInfo),
                    mPm.getApplicationIcon(mPkgInfo.applicationInfo));
        } else {
            final File sourceFile = new File(mPackageURI.getPath());
            PackageParser.Package parsed = PackageUtil.getPackageInfo(sourceFile);

            // Check for parse errors
            if (parsed == null) {
                Log.w(TAG, "Parse error when parsing manifest. Discontinuing installation");
                showDialogInner(DLG_PACKAGE_ERROR);
                setPmResult(PackageManager.INSTALL_FAILED_INVALID_APK);
                return;
            }
            mPkgInfo = PackageParser.generatePackageInfo(parsed, null,
                    PackageManager.GET_PERMISSIONS, 0, 0, null,
                    new PackageUserState());
            mPkgDigest = parsed.manifestDigest;
            as = PackageUtil.getAppSnippet(this, mPkgInfo.applicationInfo, sourceFile);
        }

        //set view
        setContentView(R.layout.install_start);
        mInstallConfirm = findViewById(R.id.install_confirm_panel);
        mInstallConfirm.setVisibility(View.INVISIBLE);
        PackageUtil.initSnippetForNewApp(this, as, R.id.app_snippet);

        mOriginatingUid = getOriginatingUid(intent);

        // Deal with install source.
        String callerPackage = getCallingPackage();
        if (callerPackage != null && intent.getBooleanExtra(
                Intent.EXTRA_NOT_UNKNOWN_SOURCE, false)) {
            try {
                mSourceInfo = mPm.getApplicationInfo(callerPackage, 0);
                if (mSourceInfo != null) {
                    if ((mSourceInfo.flags&ApplicationInfo.FLAG_SYSTEM) != 0) {
                        // System apps don't need to be approved.
                        initiateInstall();
                        return;
                    }
                    /* for now this is disabled, since the user would need to
                     * have enabled the global "unknown sources" setting in the
                     * first place in order to get here.
                    SharedPreferences prefs = getSharedPreferences(PREFS_ALLOWED_SOURCES,
                            Context.MODE_PRIVATE);
                    if (prefs.getBoolean(mSourceInfo.packageName, false)) {
                        // User has already allowed this one.
                        initiateInstall();
                        return;
                    }
                    //ask user to enable setting first
                    showDialogInner(DLG_ALLOW_SOURCE);
                    return;
                     */
                }
            } catch (NameNotFoundException e) {
            }
        }

        // Check unknown sources.
        if (!isInstallingUnknownAppsAllowed()) {
            //ask user to enable setting first
            showDialogInner(DLG_UNKNOWN_APPS);
            return;
        }
        initiateInstall();
    }

    /** Get the ApplicationInfo for the calling package, if available */
    private ApplicationInfo getSourceInfo() {
        String callingPackage = getCallingPackage();
        if (callingPackage != null) {
            try {
                return mPm.getApplicationInfo(callingPackage, 0);
            } catch (NameNotFoundException ex) {
                // ignore
            }
        }
        return null;
    }


    /** Get the originating uid if possible, or VerificationParams.NO_UID if not available */
    private int getOriginatingUid(Intent intent) {
        // The originating uid from the intent. We only trust/use this if it comes from a
        // system application
        int uidFromIntent = intent.getIntExtra(Intent.EXTRA_ORIGINATING_UID,
                VerificationParams.NO_UID);

        // Get the source info from the calling package, if available. This will be the
        // definitive calling package, but it only works if the intent was started using
        // startActivityForResult,
        ApplicationInfo sourceInfo = getSourceInfo();
        if (sourceInfo != null) {
            if (uidFromIntent != VerificationParams.NO_UID &&
                    (mSourceInfo.flags & ApplicationInfo.FLAG_SYSTEM) != 0) {
                return uidFromIntent;

            }
            // We either didn't get a uid in the intent, or we don't trust it. Use the
            // uid of the calling package instead.
            return sourceInfo.uid;
        }

        // We couldn't get the specific calling package. Let's get the uid instead
        int callingUid;
        try {
            callingUid = ActivityManagerNative.getDefault()
                    .getLaunchedFromUid(getActivityToken());
        } catch (android.os.RemoteException ex) {
            Log.w(TAG, "Could not determine the launching uid.");
            // nothing else we can do
            return VerificationParams.NO_UID;
        }

        // If we got a uid from the intent, we need to verify that the caller is a
        // system package before we use it
        if (uidFromIntent != VerificationParams.NO_UID) {
            String[] callingPackages = mPm.getPackagesForUid(callingUid);
            if (callingPackages != null) {
                for (String packageName: callingPackages) {
                    try {
                        ApplicationInfo applicationInfo =
                                mPm.getApplicationInfo(packageName, 0);

                        if ((applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) != 0) {
                            return uidFromIntent;
                        }
                    } catch (NameNotFoundException ex) {
                        // ignore it, and try the next package
                    }
                }
            }
        }
        // We either didn't get a uid from the intent, or we don't trust it. Use the
        // calling uid instead.
        return callingUid;
    }

    // Generic handling when pressing back key
    public void onCancel(DialogInterface dialog) {
        finish();
    }

    public void onClick(View v) {
        if(v == mOk) {
            if (mOkCanInstall || mScrollView == null) {
                // Start subactivity to actually install the application
                Intent newIntent = new Intent();
                newIntent.putExtra(PackageUtil.INTENT_ATTR_APPLICATION_INFO,
                        mPkgInfo.applicationInfo);
                newIntent.setData(mPackageURI);
                newIntent.setClass(this, InstallAppProgress.class);
                newIntent.putExtra(InstallAppProgress.EXTRA_MANIFEST_DIGEST, mPkgDigest);
                String installerPackageName = getIntent().getStringExtra(
                        Intent.EXTRA_INSTALLER_PACKAGE_NAME);
                if (mOriginatingURI != null) {
                    newIntent.putExtra(Intent.EXTRA_ORIGINATING_URI, mOriginatingURI);
                }
                if (mReferrerURI != null) {
                    newIntent.putExtra(Intent.EXTRA_REFERRER, mReferrerURI);
                }
                if (mOriginatingUid != VerificationParams.NO_UID) {
                    newIntent.putExtra(Intent.EXTRA_ORIGINATING_UID, mOriginatingUid);
                }
                if (installerPackageName != null) {
                    newIntent.putExtra(Intent.EXTRA_INSTALLER_PACKAGE_NAME,
                            installerPackageName);
                }
                if (getIntent().getBooleanExtra(Intent.EXTRA_RETURN_RESULT, false)) {
                    newIntent.putExtra(Intent.EXTRA_RETURN_RESULT, true);
                    newIntent.addFlags(Intent.FLAG_ACTIVITY_FORWARD_RESULT);
                }
                if(localLOGV) Log.i(TAG, "downloaded app uri="+mPackageURI);
                startActivity(newIntent);
                finish();
            } else {
                mScrollView.pageScroll(View.FOCUS_DOWN);
            }
        } else if(v == mCancel) {
            // Cancel and finish
            setResult(RESULT_CANCELED);
            finish();
        }
    }
}