Merge pull request #7975 from TacoTheDank/updateCheckerRewrite

Migrate app update checker to AndroidX Work

app/build.gradle

@@ -220,6 +220,7 @@ dependencies {
     // https://developer.android.com/jetpack/androidx/releases/viewpager2#1.1.0-alpha01
     implementation 'androidx.viewpager2:viewpager2:1.1.0-beta01'
     implementation 'androidx.webkit:webkit:1.4.0'
+    implementation 'androidx.work:work-runtime:2.7.1'
     implementation 'com.google.android.material:material:1.4.0'
 
 /** Third-party libraries **/

app/src/main/AndroidManifest.xml

@@ -381,9 +381,6 @@
         <service
             android:name=".RouterActivity$FetcherService"
             android:exported="false" />
-        <service
-            android:name=".CheckForNewAppVersion"
-            android:exported="false" />
 
         <!-- opting out of sending metrics to Google in Android System WebView -->
         <meta-data android:name="android.webkit.WebView.MetricsOptOut" android:value="true" />

app/src/main/java/org/schabi/newpipe/CheckForNewAppVersion.java

@@ -1,264 +0,0 @@
-package org.schabi.newpipe;
-
-import android.app.Application;
-import android.app.IntentService;
-import android.app.PendingIntent;
-import android.content.Intent;
-import android.content.SharedPreferences;
-import android.content.pm.PackageManager;
-import android.content.pm.Signature;
-import android.net.Uri;
-import android.util.Log;
-
-import androidx.annotation.NonNull;
-import androidx.annotation.Nullable;
-import androidx.core.app.NotificationCompat;
-import androidx.core.app.NotificationManagerCompat;
-import androidx.core.content.pm.PackageInfoCompat;
-import androidx.preference.PreferenceManager;
-
-import com.grack.nanojson.JsonObject;
-import com.grack.nanojson.JsonParser;
-import com.grack.nanojson.JsonParserException;
-
-import org.schabi.newpipe.error.ErrorInfo;
-import org.schabi.newpipe.error.ErrorUtil;
-import org.schabi.newpipe.error.UserAction;
-import org.schabi.newpipe.extractor.downloader.Response;
-import org.schabi.newpipe.extractor.exceptions.ReCaptchaException;
-
-import java.io.ByteArrayInputStream;
-import java.io.IOException;
-import java.io.InputStream;
-import java.security.MessageDigest;
-import java.security.NoSuchAlgorithmException;
-import java.security.cert.CertificateEncodingException;
-import java.security.cert.CertificateException;
-import java.security.cert.CertificateFactory;
-import java.security.cert.X509Certificate;
-import java.util.List;
-
-public final class CheckForNewAppVersion extends IntentService {
-    public CheckForNewAppVersion() {
-        super("CheckForNewAppVersion");
-    }
-
-    private static final boolean DEBUG = MainActivity.DEBUG;
-    private static final String TAG = CheckForNewAppVersion.class.getSimpleName();
-
-    // Public key of the certificate that is used in NewPipe release versions
-    private static final String RELEASE_CERT_PUBLIC_KEY_SHA1
-            = "B0:2E:90:7C:1C:D6:FC:57:C3:35:F0:88:D0:8F:50:5F:94:E4:D2:15";
-    private static final String NEWPIPE_API_URL = "https://newpipe.net/api/data.json";
-
-    /**
-     * Method to get the APK's SHA1 key. See https://stackoverflow.com/questions/9293019/#22506133.
-     *
-     * @param application The application
-     * @return String with the APK's SHA1 fingerprint in hexadecimal
-     */
-    @NonNull
-    private static String getCertificateSHA1Fingerprint(@NonNull final Application application) {
-        final List<Signature> signatures;
-        try {
-            signatures = PackageInfoCompat.getSignatures(application.getPackageManager(),
-                    application.getPackageName());
-        } catch (final PackageManager.NameNotFoundException e) {
-            ErrorUtil.createNotification(application, new ErrorInfo(e,
-                    UserAction.CHECK_FOR_NEW_APP_VERSION, "Could not find package info"));
-            return "";
-        }
-        if (signatures.isEmpty()) {
-            return "";
-        }
-
-        final X509Certificate c;
-        try {
-            final byte[] cert = signatures.get(0).toByteArray();
-            final InputStream input = new ByteArrayInputStream(cert);
-            final CertificateFactory cf = CertificateFactory.getInstance("X509");
-            c = (X509Certificate) cf.generateCertificate(input);
-        } catch (final CertificateException e) {
-            ErrorUtil.createNotification(application, new ErrorInfo(e,
-                    UserAction.CHECK_FOR_NEW_APP_VERSION, "Certificate error"));
-            return "";
-        }
-
-        try {
-            final MessageDigest md = MessageDigest.getInstance("SHA1");
-            final byte[] publicKey = md.digest(c.getEncoded());
-            return byte2HexFormatted(publicKey);
-        } catch (NoSuchAlgorithmException | CertificateEncodingException e) {
-            ErrorUtil.createNotification(application, new ErrorInfo(e,
-                    UserAction.CHECK_FOR_NEW_APP_VERSION, "Could not retrieve SHA1 key"));
-            return "";
-        }
-    }
-
-    private static String byte2HexFormatted(final byte[] arr) {
-        final StringBuilder str = new StringBuilder(arr.length * 2);
-
-        for (int i = 0; i < arr.length; i++) {
-            String h = Integer.toHexString(arr[i]);
-            final int l = h.length();
-            if (l == 1) {
-                h = "0" + h;
-            }
-            if (l > 2) {
-                h = h.substring(l - 2, l);
-            }
-            str.append(h.toUpperCase());
-            if (i < (arr.length - 1)) {
-                str.append(':');
-            }
-        }
-        return str.toString();
-    }
-
-    /**
-     * Method to compare the current and latest available app version.
-     * If a newer version is available, we show the update notification.
-     *
-     * @param application    The application
-     * @param versionName    Name of new version
-     * @param apkLocationUrl Url with the new apk
-     * @param versionCode    Code of new version
-     */
-    private static void compareAppVersionAndShowNotification(@NonNull final Application application,
-                                                             final String versionName,
-                                                             final String apkLocationUrl,
-                                                             final int versionCode) {
-        if (BuildConfig.VERSION_CODE >= versionCode) {
-            return;
-        }
-
-        // A pending intent to open the apk location url in the browser.
-        final Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(apkLocationUrl));
-        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
-        final PendingIntent pendingIntent
-                = PendingIntent.getActivity(application, 0, intent, 0);
-
-        final String channelId = application
-                .getString(R.string.app_update_notification_channel_id);
-        final NotificationCompat.Builder notificationBuilder
-                = new NotificationCompat.Builder(application, channelId)
-                .setSmallIcon(R.drawable.ic_newpipe_update)
-                .setVisibility(NotificationCompat.VISIBILITY_PUBLIC)
-                .setContentIntent(pendingIntent)
-                .setAutoCancel(true)
-                .setContentTitle(application
-                        .getString(R.string.app_update_notification_content_title))
-                .setContentText(application
-                        .getString(R.string.app_update_notification_content_text)
-                        + " " + versionName);
-
-        final NotificationManagerCompat notificationManager
-                = NotificationManagerCompat.from(application);
-        notificationManager.notify(2000, notificationBuilder.build());
-    }
-
-    public static boolean isReleaseApk(@NonNull final App app) {
-        return getCertificateSHA1Fingerprint(app).equals(RELEASE_CERT_PUBLIC_KEY_SHA1);
-    }
-
-    private void checkNewVersion() throws IOException, ReCaptchaException {
-        final App app = App.getApp();
-
-        final SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(app);
-        final NewVersionManager manager = new NewVersionManager();
-
-        // Check if the current apk is a github one or not.
-        if (!isReleaseApk(app)) {
-            return;
-        }
-
-        // Check if the last request has happened a certain time ago
-        // to reduce the number of API requests.
-        final long expiry = prefs.getLong(app.getString(R.string.update_expiry_key), 0);
-        if (!manager.isExpired(expiry)) {
-            return;
-        }
-
-        // Make a network request to get latest NewPipe data.
-        final Response response = DownloaderImpl.getInstance().get(NEWPIPE_API_URL);
-        handleResponse(response, manager, prefs, app);
-    }
-
-    private void handleResponse(@NonNull final Response response,
-                                @NonNull final NewVersionManager manager,
-                                @NonNull final SharedPreferences prefs,
-                                @NonNull final App app) {
-        try {
-            // Store a timestamp which needs to be exceeded,
-            // before a new request to the API is made.
-            final long newExpiry = manager
-                    .coerceExpiry(response.getHeader("expires"));
-            prefs.edit()
-                    .putLong(app.getString(R.string.update_expiry_key), newExpiry)
-                    .apply();
-        } catch (final Exception e) {
-            if (DEBUG) {
-                Log.w(TAG, "Could not extract and save new expiry date", e);
-            }
-        }
-
-        // Parse the json from the response.
-        try {
-
-            final JsonObject githubStableObject = JsonParser.object()
-                    .from(response.responseBody()).getObject("flavors")
-                    .getObject("github").getObject("stable");
-
-            final String versionName = githubStableObject
-                    .getString("version");
-            final int versionCode = githubStableObject
-                    .getInt("version_code");
-            final String apkLocationUrl = githubStableObject
-                    .getString("apk");
-
-            compareAppVersionAndShowNotification(app, versionName,
-                    apkLocationUrl, versionCode);
-        } catch (final JsonParserException e) {
-            // Most likely something is wrong in data received from NEWPIPE_API_URL.
-            // Do not alarm user and fail silently.
-            if (DEBUG) {
-                Log.w(TAG, "Could not get NewPipe API: invalid json", e);
-            }
-        }
-    }
-
-    /**
-     * Start a new service which
-     * checks if all conditions for performing a version check are met,
-     * fetches the API endpoint {@link #NEWPIPE_API_URL} containing info
-     * about the latest NewPipe version
-     * and displays a notification about ana available update.
-     * <br>
-     * Following conditions need to be met, before data is request from the server:
-     * <ul>
-     * <li> The app is signed with the correct signing key (by TeamNewPipe / schabi).
-     * If the signing key differs from the one used upstream, the update cannot be installed.</li>
-     * <li>The user enabled searching for and notifying about updates in the settings.</li>
-     * <li>The app did not recently check for updates.
-     * We do not want to make unnecessary connections and DOS our servers.</li>
-     * </ul>
-     * <b>Must not be executed</b> when the app is in background.
-     */
-    public static void startNewVersionCheckService() {
-        final Intent intent = new Intent(App.getApp().getApplicationContext(),
-                CheckForNewAppVersion.class);
-        App.getApp().startService(intent);
-    }
-
-    @Override
-    protected void onHandleIntent(@Nullable final Intent intent) {
-        try {
-            checkNewVersion();
-        } catch (final IOException e) {
-            Log.w(TAG, "Could not fetch NewPipe API: probably network problem", e);
-        } catch (final ReCaptchaException e) {
-            Log.e(TAG, "ReCaptchaException should never happen here.", e);
-        }
-
-    }
-}

app/src/main/java/org/schabi/newpipe/MainActivity.java

@@ -20,7 +20,6 @@
 
 package org.schabi.newpipe;
 
-import static org.schabi.newpipe.CheckForNewAppVersion.startNewVersionCheckService;
 import static org.schabi.newpipe.util.Localization.assureCorrectAppLanguage;
 
 import android.content.BroadcastReceiver;
@@ -174,10 +173,9 @@ public class MainActivity extends AppCompatActivity {
         final SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(app);
 
         if (prefs.getBoolean(app.getString(R.string.update_app_key), true)) {
-            // Start the service which is checking all conditions
+            // Start the worker which is checking all conditions
             // and eventually searching for a new version.
-            // The service searching for a new NewPipe version must not be started in background.
+            NewVersionWorker.enqueueNewVersionCheckingWork(app);
-            startNewVersionCheckService();
         }
     }
 

app/src/main/java/org/schabi/newpipe/NewVersionManager.kt

@@ -1,28 +0,0 @@
-package org.schabi.newpipe
-
-import java.time.Instant
-import java.time.ZonedDateTime
-import java.time.format.DateTimeFormatter
-
-class NewVersionManager {
-
-    fun isExpired(expiry: Long): Boolean {
-        return Instant.ofEpochSecond(expiry).isBefore(Instant.now())
-    }
-
-    /**
-     * Coerce expiry date time in between 6 hours and 72 hours from now
-     *
-     * @return Epoch second of expiry date time
-     */
-    fun coerceExpiry(expiryString: String?): Long {
-        val now = ZonedDateTime.now()
-        return expiryString?.let {
-
-            var expiry = ZonedDateTime.from(DateTimeFormatter.RFC_1123_DATE_TIME.parse(expiryString))
-            expiry = maxOf(expiry, now.plusHours(6))
-            expiry = minOf(expiry, now.plusHours(72))
-            expiry.toEpochSecond()
-        } ?: now.plusHours(6).toEpochSecond()
-    }
-}

app/src/main/java/org/schabi/newpipe/NewVersionWorker.kt

@@ -0,0 +1,163 @@
+package org.schabi.newpipe
+
+import android.app.PendingIntent
+import android.content.Context
+import android.content.Intent
+import android.util.Log
+import androidx.core.app.NotificationCompat
+import androidx.core.app.NotificationManagerCompat
+import androidx.core.content.edit
+import androidx.core.net.toUri
+import androidx.preference.PreferenceManager
+import androidx.work.OneTimeWorkRequest
+import androidx.work.WorkManager
+import androidx.work.WorkRequest
+import androidx.work.Worker
+import androidx.work.WorkerParameters
+import com.grack.nanojson.JsonParser
+import com.grack.nanojson.JsonParserException
+import org.schabi.newpipe.extractor.downloader.Response
+import org.schabi.newpipe.extractor.exceptions.ReCaptchaException
+import org.schabi.newpipe.util.ReleaseVersionUtil.coerceUpdateCheckExpiry
+import org.schabi.newpipe.util.ReleaseVersionUtil.isLastUpdateCheckExpired
+import org.schabi.newpipe.util.ReleaseVersionUtil.isReleaseApk
+import java.io.IOException
+
+class NewVersionWorker(
+    context: Context,
+    workerParams: WorkerParameters
+) : Worker(context, workerParams) {
+
+    /**
+     * Method to compare the current and latest available app version.
+     * If a newer version is available, we show the update notification.
+     *
+     * @param versionName    Name of new version
+     * @param apkLocationUrl Url with the new apk
+     * @param versionCode    Code of new version
+     */
+    private fun compareAppVersionAndShowNotification(
+        versionName: String,
+        apkLocationUrl: String?,
+        versionCode: Int
+    ) {
+        if (BuildConfig.VERSION_CODE >= versionCode) {
+            return
+        }
+        val app = App.getApp()
+
+        // A pending intent to open the apk location url in the browser.
+        val intent = Intent(Intent.ACTION_VIEW, apkLocationUrl?.toUri())
+        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+        val pendingIntent = PendingIntent.getActivity(app, 0, intent, 0)
+        val channelId = app.getString(R.string.app_update_notification_channel_id)
+        val notificationBuilder = NotificationCompat.Builder(app, channelId)
+            .setSmallIcon(R.drawable.ic_newpipe_update)
+            .setVisibility(NotificationCompat.VISIBILITY_PUBLIC)
+            .setContentIntent(pendingIntent)
+            .setAutoCancel(true)
+            .setContentTitle(app.getString(R.string.app_update_notification_content_title))
+            .setContentText(
+                app.getString(R.string.app_update_notification_content_text) +
+                    " " + versionName
+            )
+        val notificationManager = NotificationManagerCompat.from(app)
+        notificationManager.notify(2000, notificationBuilder.build())
+    }
+
+    @Throws(IOException::class, ReCaptchaException::class)
+    private fun checkNewVersion() {
+        // Check if the current apk is a github one or not.
+        if (!isReleaseApk()) {
+            return
+        }
+
+        val prefs = PreferenceManager.getDefaultSharedPreferences(applicationContext)
+        // Check if the last request has happened a certain time ago
+        // to reduce the number of API requests.
+        val expiry = prefs.getLong(applicationContext.getString(R.string.update_expiry_key), 0)
+        if (!isLastUpdateCheckExpired(expiry)) {
+            return
+        }
+
+        // Make a network request to get latest NewPipe data.
+        val response = DownloaderImpl.getInstance().get(NEWPIPE_API_URL)
+        handleResponse(response)
+    }
+
+    private fun handleResponse(response: Response) {
+        val prefs = PreferenceManager.getDefaultSharedPreferences(applicationContext)
+        try {
+            // Store a timestamp which needs to be exceeded,
+            // before a new request to the API is made.
+            val newExpiry = coerceUpdateCheckExpiry(response.getHeader("expires"))
+            prefs.edit {
+                putLong(applicationContext.getString(R.string.update_expiry_key), newExpiry)
+            }
+        } catch (e: Exception) {
+            if (DEBUG) {
+                Log.w(TAG, "Could not extract and save new expiry date", e)
+            }
+        }
+
+        // Parse the json from the response.
+        try {
+            val githubStableObject = JsonParser.`object`()
+                .from(response.responseBody()).getObject("flavors")
+                .getObject("github").getObject("stable")
+
+            val versionName = githubStableObject.getString("version")
+            val versionCode = githubStableObject.getInt("version_code")
+            val apkLocationUrl = githubStableObject.getString("apk")
+            compareAppVersionAndShowNotification(versionName, apkLocationUrl, versionCode)
+        } catch (e: JsonParserException) {
+            // Most likely something is wrong in data received from NEWPIPE_API_URL.
+            // Do not alarm user and fail silently.
+            if (DEBUG) {
+                Log.w(TAG, "Could not get NewPipe API: invalid json", e)
+            }
+        }
+    }
+
+    override fun doWork(): Result {
+        try {
+            checkNewVersion()
+        } catch (e: IOException) {
+            Log.w(TAG, "Could not fetch NewPipe API: probably network problem", e)
+            return Result.failure()
+        } catch (e: ReCaptchaException) {
+            Log.e(TAG, "ReCaptchaException should never happen here.", e)
+            return Result.failure()
+        }
+        return Result.success()
+    }
+
+    companion object {
+        private val DEBUG = MainActivity.DEBUG
+        private val TAG = NewVersionWorker::class.java.simpleName
+        private const val NEWPIPE_API_URL = "https://newpipe.net/api/data.json"
+
+        /**
+         * Start a new worker which
+         * checks if all conditions for performing a version check are met,
+         * fetches the API endpoint [.NEWPIPE_API_URL] containing info
+         * about the latest NewPipe version
+         * and displays a notification about ana available update.
+         * <br></br>
+         * Following conditions need to be met, before data is request from the server:
+         *
+         *  *  The app is signed with the correct signing key (by TeamNewPipe / schabi).
+         * If the signing key differs from the one used upstream, the update cannot be installed.
+         *  * The user enabled searching for and notifying about updates in the settings.
+         *  * The app did not recently check for updates.
+         * We do not want to make unnecessary connections and DOS our servers.
+         *
+         */
+        @JvmStatic
+        fun enqueueNewVersionCheckingWork(context: Context) {
+            val workRequest: WorkRequest =
+                OneTimeWorkRequest.Builder(NewVersionWorker::class.java).build()
+            WorkManager.getInstance(context).enqueue(workRequest)
+        }
+    }
+}

app/src/main/java/org/schabi/newpipe/settings/MainSettingsFragment.java

@@ -7,10 +7,9 @@ import android.view.MenuItem;
 
 import androidx.annotation.NonNull;
 
-import org.schabi.newpipe.App;
-import org.schabi.newpipe.CheckForNewAppVersion;
 import org.schabi.newpipe.MainActivity;
 import org.schabi.newpipe.R;
+import org.schabi.newpipe.util.ReleaseVersionUtil;
 
 public class MainSettingsFragment extends BasePreferenceFragment {
     public static final boolean DEBUG = MainActivity.DEBUG;
@@ -24,7 +23,7 @@ public class MainSettingsFragment extends BasePreferenceFragment {
         setHasOptionsMenu(true); // Otherwise onCreateOptionsMenu is not called
 
         // Check if the app is updatable
-        if (!CheckForNewAppVersion.isReleaseApk(App.getApp())) {
+        if (!ReleaseVersionUtil.isReleaseApk()) {
             getPreferenceScreen().removePreference(
                     findPreference(getString(R.string.update_pref_screen_key)));
 

app/src/main/java/org/schabi/newpipe/settings/SettingsActivity.java

@@ -23,8 +23,6 @@ import androidx.preference.PreferenceFragmentCompat;
 
 import com.jakewharton.rxbinding4.widget.RxTextView;
 
-import org.schabi.newpipe.App;
-import org.schabi.newpipe.CheckForNewAppVersion;
 import org.schabi.newpipe.MainActivity;
 import org.schabi.newpipe.R;
 import org.schabi.newpipe.databinding.SettingsLayoutBinding;
@@ -37,6 +35,7 @@ import org.schabi.newpipe.settings.preferencesearch.PreferenceSearchResultListen
 import org.schabi.newpipe.settings.preferencesearch.PreferenceSearcher;
 import org.schabi.newpipe.util.DeviceUtils;
 import org.schabi.newpipe.util.KeyboardUtil;
+import org.schabi.newpipe.util.ReleaseVersionUtil;
 import org.schabi.newpipe.util.ThemeHelper;
 import org.schabi.newpipe.views.FocusOverlayView;
 
@@ -267,7 +266,7 @@ public class SettingsActivity extends AppCompatActivity implements
      */
     private void ensureSearchRepresentsApplicationState() {
         // Check if the update settings are available
-        if (!CheckForNewAppVersion.isReleaseApk(App.getApp())) {
+        if (!ReleaseVersionUtil.isReleaseApk()) {
             SettingsResourceRegistry.getInstance()
                     .getEntryByPreferencesResId(R.xml.update_settings)
                     .setSearchable(false);

app/src/main/java/org/schabi/newpipe/settings/UpdateSettingsFragment.java

@@ -1,12 +1,11 @@
 package org.schabi.newpipe.settings;
 
-import static org.schabi.newpipe.CheckForNewAppVersion.startNewVersionCheckService;
-
 import android.os.Bundle;
 import android.widget.Toast;
 
 import androidx.preference.Preference;
 
+import org.schabi.newpipe.NewVersionWorker;
 import org.schabi.newpipe.R;
 
 public class UpdateSettingsFragment extends BasePreferenceFragment {
@@ -33,7 +32,7 @@ public class UpdateSettingsFragment extends BasePreferenceFragment {
         // Reset the expire time. This is necessary to check for an update immediately.
         defaultPreferences.edit()
                 .putLong(getString(R.string.update_expiry_key), 0).apply();
-        startNewVersionCheckService();
+        NewVersionWorker.enqueueNewVersionCheckingWork(getContext());
     }
 
     @Override

app/src/main/java/org/schabi/newpipe/util/ReleaseVersionUtil.kt

@@ -0,0 +1,116 @@
+package org.schabi.newpipe.util
+
+import android.content.pm.PackageManager
+import android.content.pm.Signature
+import androidx.core.content.pm.PackageInfoCompat
+import org.schabi.newpipe.App
+import org.schabi.newpipe.error.ErrorInfo
+import org.schabi.newpipe.error.ErrorUtil.Companion.createNotification
+import org.schabi.newpipe.error.UserAction
+import java.io.ByteArrayInputStream
+import java.io.InputStream
+import java.security.MessageDigest
+import java.security.NoSuchAlgorithmException
+import java.security.cert.CertificateEncodingException
+import java.security.cert.CertificateException
+import java.security.cert.CertificateFactory
+import java.security.cert.X509Certificate
+import java.time.Instant
+import java.time.ZonedDateTime
+import java.time.format.DateTimeFormatter
+
+object ReleaseVersionUtil {
+    // Public key of the certificate that is used in NewPipe release versions
+    private const val RELEASE_CERT_PUBLIC_KEY_SHA1 =
+        "B0:2E:90:7C:1C:D6:FC:57:C3:35:F0:88:D0:8F:50:5F:94:E4:D2:15"
+
+    @JvmStatic
+    fun isReleaseApk(): Boolean {
+        return certificateSHA1Fingerprint == RELEASE_CERT_PUBLIC_KEY_SHA1
+    }
+
+    /**
+     * Method to get the APK's SHA1 key. See https://stackoverflow.com/questions/9293019/#22506133.
+     *
+     * @return String with the APK's SHA1 fingerprint in hexadecimal
+     */
+    private val certificateSHA1Fingerprint: String
+        get() {
+            val app = App.getApp()
+            val signatures: List<Signature> = try {
+                PackageInfoCompat.getSignatures(app.packageManager, app.packageName)
+            } catch (e: PackageManager.NameNotFoundException) {
+                showRequestError(app, e, "Could not find package info")
+                return ""
+            }
+            if (signatures.isEmpty()) {
+                return ""
+            }
+            val x509cert = try {
+                val cert = signatures[0].toByteArray()
+                val input: InputStream = ByteArrayInputStream(cert)
+                val cf = CertificateFactory.getInstance("X509")
+                cf.generateCertificate(input) as X509Certificate
+            } catch (e: CertificateException) {
+                showRequestError(app, e, "Certificate error")
+                return ""
+            }
+
+            return try {
+                val md = MessageDigest.getInstance("SHA1")
+                val publicKey = md.digest(x509cert.encoded)
+                byte2HexFormatted(publicKey)
+            } catch (e: NoSuchAlgorithmException) {
+                showRequestError(app, e, "Could not retrieve SHA1 key")
+                ""
+            } catch (e: CertificateEncodingException) {
+                showRequestError(app, e, "Could not retrieve SHA1 key")
+                ""
+            }
+        }
+
+    private fun byte2HexFormatted(arr: ByteArray): String {
+        val str = StringBuilder(arr.size * 2)
+        for (i in arr.indices) {
+            var h = Integer.toHexString(arr[i].toInt())
+            val l = h.length
+            if (l == 1) {
+                h = "0$h"
+            }
+            if (l > 2) {
+                h = h.substring(l - 2, l)
+            }
+            str.append(h.uppercase())
+            if (i < arr.size - 1) {
+                str.append(':')
+            }
+        }
+        return str.toString()
+    }
+
+    private fun showRequestError(app: App, e: Exception, request: String) {
+        createNotification(
+            app, ErrorInfo(e, UserAction.CHECK_FOR_NEW_APP_VERSION, request)
+        )
+    }
+
+    fun isLastUpdateCheckExpired(expiry: Long): Boolean {
+        return Instant.ofEpochSecond(expiry).isBefore(Instant.now())
+    }
+
+    /**
+     * Coerce expiry date time in between 6 hours and 72 hours from now
+     *
+     * @return Epoch second of expiry date time
+     */
+    fun coerceUpdateCheckExpiry(expiryString: String?): Long {
+        val now = ZonedDateTime.now()
+        return expiryString?.let {
+            var expiry =
+                ZonedDateTime.from(DateTimeFormatter.RFC_1123_DATE_TIME.parse(expiryString))
+            expiry = maxOf(expiry, now.plusHours(6))
+            expiry = minOf(expiry, now.plusHours(72))
+            expiry.toEpochSecond()
+        } ?: now.plusHours(6).toEpochSecond()
+    }
+}

app/src/test/java/org/schabi/newpipe/NewVersionManagerTest.kt

@@ -2,8 +2,9 @@ package org.schabi.newpipe
 
 import org.junit.Assert.assertFalse
 import org.junit.Assert.assertTrue
-import org.junit.Before
 import org.junit.Test
+import org.schabi.newpipe.util.ReleaseVersionUtil.coerceUpdateCheckExpiry
+import org.schabi.newpipe.util.ReleaseVersionUtil.isLastUpdateCheckExpired
 import java.time.Instant
 import java.time.ZoneId
 import java.time.format.DateTimeFormatter
@@ -11,18 +12,11 @@ import kotlin.math.abs
 
 class NewVersionManagerTest {
 
-    private lateinit var manager: NewVersionManager
-
-    @Before
-    fun setup() {
-        manager = NewVersionManager()
-    }
-
     @Test
     fun `Expiry is reached`() {
         val oneHourEarlier = Instant.now().atZone(ZoneId.of("GMT")).minusHours(1)
 
-        val expired = manager.isExpired(oneHourEarlier.toEpochSecond())
+        val expired = isLastUpdateCheckExpired(oneHourEarlier.toEpochSecond())
 
         assertTrue(expired)
     }
@@ -31,7 +25,7 @@ class NewVersionManagerTest {
     fun `Expiry is not reached`() {
         val oneHourLater = Instant.now().atZone(ZoneId.of("GMT")).plusHours(1)
 
-        val expired = manager.isExpired(oneHourLater.toEpochSecond())
+        val expired = isLastUpdateCheckExpired(oneHourLater.toEpochSecond())
 
         assertFalse(expired)
     }
@@ -47,7 +41,7 @@ class NewVersionManagerTest {
     fun `Expiry must be returned as is because it is inside the acceptable range of 6-72 hours`() {
         val sixHoursLater = Instant.now().atZone(ZoneId.of("GMT")).plusHours(6)
 
-        val coerced = manager.coerceExpiry(DateTimeFormatter.RFC_1123_DATE_TIME.format(sixHoursLater))
+        val coerced = coerceUpdateCheckExpiry(DateTimeFormatter.RFC_1123_DATE_TIME.format(sixHoursLater))
 
         assertNearlyEqual(sixHoursLater.toEpochSecond(), coerced)
     }
@@ -56,7 +50,7 @@ class NewVersionManagerTest {
     fun `Expiry must be increased to 6 hours if below`() {
         val tooLow = Instant.now().atZone(ZoneId.of("GMT")).plusHours(5)
 
-        val coerced = manager.coerceExpiry(DateTimeFormatter.RFC_1123_DATE_TIME.format(tooLow))
+        val coerced = coerceUpdateCheckExpiry(DateTimeFormatter.RFC_1123_DATE_TIME.format(tooLow))
 
         assertNearlyEqual(tooLow.plusHours(1).toEpochSecond(), coerced)
     }
@@ -65,7 +59,7 @@ class NewVersionManagerTest {
     fun `Expiry must be decreased to 72 hours if above`() {
         val tooHigh = Instant.now().atZone(ZoneId.of("GMT")).plusHours(73)
 
-        val coerced = manager.coerceExpiry(DateTimeFormatter.RFC_1123_DATE_TIME.format(tooHigh))
+        val coerced = coerceUpdateCheckExpiry(DateTimeFormatter.RFC_1123_DATE_TIME.format(tooHigh))
 
         assertNearlyEqual(tooHigh.minusHours(1).toEpochSecond(), coerced)
     }