Trim strings added to persistent snoozed notification storage.

Fix: 258422365
Test: atest NotificationManagerServiceTest SnoozeHelperTest; Also tested the reproduction steps in b/258422365#comment6 manually to check that the issue doesn't happen anymore.
Change-Id: I5a2823f10053ea8c83c612a567d6d4f1b6af23e7

services/core/java/com/android/server/notification/SnoozeHelper.java

@@ -59,6 +59,9 @@ public final class SnoozeHelper {
 
     static final int CONCURRENT_SNOOZE_LIMIT = 500;
 
+    // A safe size for strings to be put in persistent storage, to avoid breaking the XML write.
+    static final int MAX_STRING_LENGTH = 1000;
+
     protected static final String XML_TAG_NAME = "snoozed-notifications";
 
     private static final String XML_SNOOZED_NOTIFICATION = "notification";
@@ -200,7 +203,7 @@ public final class SnoozeHelper {
         scheduleRepost(key, duration);
         Long activateAt = System.currentTimeMillis() + duration;
         synchronized (mLock) {
-            mPersistedSnoozedNotifications.put(key, activateAt);
+            mPersistedSnoozedNotifications.put(getTrimmedString(key), activateAt);
         }
     }
 
@@ -210,7 +213,10 @@ public final class SnoozeHelper {
     protected void snooze(NotificationRecord record, String contextId) {
         if (contextId != null) {
             synchronized (mLock) {
-                mPersistedSnoozedNotificationsWithContext.put(record.getKey(), contextId);
+                mPersistedSnoozedNotificationsWithContext.put(
+                        getTrimmedString(record.getKey()),
+                        getTrimmedString(contextId)
+                );
             }
         }
         snooze(record);
@@ -225,6 +231,13 @@ public final class SnoozeHelper {
         }
     }
 
+    private String getTrimmedString(String key) {
+        if (key != null && key.length() > MAX_STRING_LENGTH) {
+            return key.substring(0, MAX_STRING_LENGTH);
+        }
+        return key;
+    }
+
     protected boolean cancel(int userId, String pkg, String tag, int id) {
         synchronized (mLock) {
             final Set<Map.Entry<String, NotificationRecord>> records =
@@ -293,10 +306,12 @@ public final class SnoozeHelper {
     }
 
     protected void repost(String key, int userId, boolean muteOnReturn) {
+        final String trimmedKey = getTrimmedString(key);
+
         NotificationRecord record;
         synchronized (mLock) {
-            mPersistedSnoozedNotifications.remove(key);
+            mPersistedSnoozedNotifications.remove(trimmedKey);
-            mPersistedSnoozedNotificationsWithContext.remove(key);
+            mPersistedSnoozedNotificationsWithContext.remove(trimmedKey);
             record = mSnoozedNotifications.remove(key);
         }
 

services/tests/uiservicestests/src/com/android/server/notification/SnoozeHelperTest.java

@@ -233,6 +233,37 @@ public class SnoozeHelperTest extends UiServiceTestCase {
         assertEquals("key2", captor2.getValue().getIntent().getStringExtra(EXTRA_KEY));
     }
 
+    @Test
+    public void testScheduleRepostsForLongTagPersistedNotification() throws Exception {
+        String longTag = "A".repeat(66000);
+        NotificationRecord r = getNotificationRecord("pkg", 1, longTag, UserHandle.SYSTEM);
+        mSnoozeHelper.snooze(r, 0);
+
+        // We store the full key in temp storage.
+        ArgumentCaptor<PendingIntent> captor = ArgumentCaptor.forClass(PendingIntent.class);
+        verify(mAm).setExactAndAllowWhileIdle(anyInt(), anyLong(), captor.capture());
+        assertEquals(66010, captor.getValue().getIntent().getStringExtra(EXTRA_KEY).length());
+
+        TypedXmlSerializer serializer = Xml.newFastSerializer();
+        ByteArrayOutputStream baos = new ByteArrayOutputStream();
+        serializer.setOutput(new BufferedOutputStream(baos), "utf-8");
+        serializer.startDocument(null, true);
+        mSnoozeHelper.writeXml(serializer);
+        serializer.endDocument();
+        serializer.flush();
+
+        TypedXmlPullParser parser = Xml.newFastPullParser();
+        parser.setInput(new BufferedInputStream(
+                new ByteArrayInputStream(baos.toByteArray())), "utf-8");
+        mSnoozeHelper.readXml(parser, 4);
+
+        mSnoozeHelper.scheduleRepostsForPersistedNotifications(5);
+
+        // We trim the key in persistent storage.
+        verify(mAm, times(2)).setExactAndAllowWhileIdle(anyInt(), anyLong(), captor.capture());
+        assertEquals(1000, captor.getValue().getIntent().getStringExtra(EXTRA_KEY).length());
+    }
+
     @Test
     public void testSnoozeForTime() throws Exception {
         NotificationRecord r = getNotificationRecord("pkg", 1, "one", UserHandle.SYSTEM);