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prevent crash loop after rapid install/uninstall cycling

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If you quickly cycle between installing an app and uninstalling it, then
`app.installedApk` will still be null when AppDetails2.startUninstall()
calls InstallerService.uninstall().  It is better to crash earlier here,
before the Intent is sent with a null APK, because InstallerService is set
to receive Sticky Intents.  That means they will automatically be resent
by the system until they successfully complete.
This commit is contained in:
Hans-Christoph Steiner 2018-06-27 14:16:15 +02:00
parent ea166fbc81
commit 519101a8a4
1 changed files with 24 additions and 3 deletions
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27
app/src/main/java/org/fdroid/fdroid/installer/InstallerService.java
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@ -32,6 +32,7 @@ import org.fdroid.fdroid.data.Apk;
import java.io.File;
import java.io.FileFilter;
import java.util.Objects;
/**
* This service handles the install process of apk files and
@ -63,6 +64,9 @@ public class InstallerService extends JobIntentService {
@Override
protected void onHandleWork(@NonNull Intent intent) {
final Apk apk = intent.getParcelableExtra(Installer.EXTRA_APK);
if (apk == null) {
return;
}
Installer installer = InstallerFactory.create(this, apk);
if (ACTION_INSTALL.equals(intent.getAction())) {
@ -98,12 +102,17 @@ public class InstallerService extends JobIntentService {
}
/**
* Install an apk from {@link Uri}
* Install an apk from {@link Uri}.
* <p>
* This does not include the same level of input validation as
* {@link #uninstall(Context, Apk)} since this is called in one place where
* the input has already been validated.
*
* @param context this app's {@link Context}
* @param localApkUri {@link Uri} pointing to (downloaded) local apk file
* @param downloadUri {@link Uri} where the apk has been downloaded from
* @param apk apk object of app that should be installed
* @see #uninstall(Context, Apk)
*/
public static void install(Context context, Uri localApkUri, Uri downloadUri, Apk apk) {
Intent intent = new Intent(context, InstallerService.class);
@ -115,12 +124,24 @@ public class InstallerService extends JobIntentService {
}
/**
* Uninstall an app
* Uninstall an app. {@link Objects#requireNonNull(Object)} is used to
* enforce the {@code @NonNull} requirement, since that annotation alone
* is not enough to catch all possible nulls.
* <p>
* If you quickly cycle between installing an app and uninstalling it, then
* {@link org.fdroid.fdroid.data.App#installedApk} will still be null when
* {@link org.fdroid.fdroid.AppDetails2#startUninstall()} calls
* this method. It is better to crash earlier here, before the {@link Intent}
* is sent with a null {@link Apk} instance since this service is set to
* receive Sticky Intents. That means they will automatically be resent
* by the system until they successfully complete. If an {@code Intent}
* with a null {@code Apk} is sent, it'll crash.
*
* @param context this app's {@link Context}
* @param apk {@link Apk} instance of the app that will be uninstalled
*/
public static void uninstall(Context context, Apk apk) {
public static void uninstall(Context context, @NonNull Apk apk) {
Objects.requireNonNull(apk);
Intent intent = new Intent(context, InstallerService.class);
intent.setAction(ACTION_UNINSTALL);
intent.putExtra(Installer.EXTRA_APK, apk);