[SR] Add beforeSendReplay callback

CHANGELOG.md

@@ -6,6 +6,7 @@
 
 - Android 15: Add support for 16KB page sizes ([#3620](https://github.com/getsentry/sentry-java/pull/3620))
   - See https://developer.android.com/guide/practices/page-sizes for more details
+- Session Replay: Add `beforeSendReplay` callback ([#3855](https://github.com/getsentry/sentry-java/pull/3855))
 
 ### Fixes
 

sentry/api/sentry.api

@@ -2372,6 +2372,7 @@ public class io/sentry/SentryOptions {
 	public fun getBeforeEmitMetricCallback ()Lio/sentry/SentryOptions$BeforeEmitMetricCallback;
 	public fun getBeforeEnvelopeCallback ()Lio/sentry/SentryOptions$BeforeEnvelopeCallback;
 	public fun getBeforeSend ()Lio/sentry/SentryOptions$BeforeSendCallback;
+	public fun getBeforeSendReplay ()Lio/sentry/SentryOptions$BeforeSendReplayCallback;
 	public fun getBeforeSendTransaction ()Lio/sentry/SentryOptions$BeforeSendTransactionCallback;
 	public fun getBundleIds ()Ljava/util/Set;
 	public fun getCacheDirPath ()Ljava/lang/String;
@@ -2487,6 +2488,7 @@ public class io/sentry/SentryOptions {
 	public fun setBeforeEmitMetricCallback (Lio/sentry/SentryOptions$BeforeEmitMetricCallback;)V
 	public fun setBeforeEnvelopeCallback (Lio/sentry/SentryOptions$BeforeEnvelopeCallback;)V
 	public fun setBeforeSend (Lio/sentry/SentryOptions$BeforeSendCallback;)V
+	public fun setBeforeSendReplay (Lio/sentry/SentryOptions$BeforeSendReplayCallback;)V
 	public fun setBeforeSendTransaction (Lio/sentry/SentryOptions$BeforeSendTransactionCallback;)V
 	public fun setCacheDirPath (Ljava/lang/String;)V
 	public fun setConnectionStatusProvider (Lio/sentry/IConnectionStatusProvider;)V
@@ -2593,6 +2595,10 @@ public abstract interface class io/sentry/SentryOptions$BeforeSendCallback {
 	public abstract fun execute (Lio/sentry/SentryEvent;Lio/sentry/Hint;)Lio/sentry/SentryEvent;
 }
 
+public abstract interface class io/sentry/SentryOptions$BeforeSendReplayCallback {
+	public abstract fun execute (Lio/sentry/SentryReplayEvent;Lio/sentry/Hint;)Lio/sentry/SentryReplayEvent;
+}
+
 public abstract interface class io/sentry/SentryOptions$BeforeSendTransactionCallback {
 	public abstract fun execute (Lio/sentry/protocol/SentryTransaction;Lio/sentry/Hint;)Lio/sentry/protocol/SentryTransaction;
 }

sentry/src/main/java/io/sentry/SentryClient.java

@@ -285,8 +285,18 @@ private void finalizeTransaction(final @NotNull IScope scope, final @NotNull Hin
 
     event = processReplayEvent(event, hint, options.getEventProcessors());
 
+    if (event != null) {
+      event = executeBeforeSendReplay(event, hint);
+
+      if (event == null) {
+        options.getLogger().log(SentryLevel.DEBUG, "Event was dropped by beforeSendReplay");
+        options
+            .getClientReportRecorder()
+            .recordLostEvent(DiscardReason.BEFORE_SEND, DataCategory.Replay);
+      }
+    }
+
     if (event == null) {
-      options.getLogger().log(SentryLevel.DEBUG, "Replay was dropped by Event processors.");
       return SentryId.EMPTY_ID;
     }
 
@@ -1126,6 +1136,27 @@ private void sortBreadcrumbsByDate(
     return transaction;
   }
 
+  private @Nullable SentryReplayEvent executeBeforeSendReplay(
+      @NotNull SentryReplayEvent event, final @NotNull Hint hint) {
+    final SentryOptions.BeforeSendReplayCallback beforeSendReplay = options.getBeforeSendReplay();
+    if (beforeSendReplay != null) {
+      try {
+        event = beforeSendReplay.execute(event, hint);
+      } catch (Throwable e) {
+        options
+            .getLogger()
+            .log(
+                SentryLevel.ERROR,
+                "The BeforeSendReplay callback threw an exception. It will be added as breadcrumb and continue.",
+                e);
+
+        // drop event in case of an error in beforeSend due to PII concerns
+        event = null;
+      }
+    }
+    return event;
+  }
+
   @Override
   public void close() {
     close(false);

sentry/src/main/java/io/sentry/SentryOptions.java

@@ -150,6 +150,12 @@ public class SentryOptions {
    */
   private @Nullable BeforeSendTransactionCallback beforeSendTransaction;
 
+  /**
+   * This function is called with an SDK specific replay object and can return a modified replay
+   * object or nothing to skip reporting the replay
+   */
+  private @Nullable BeforeSendReplayCallback beforeSendReplay;
+
   /**
    * This function is called with an SDK specific breadcrumb object before the breadcrumb is added
    * to the scope. When nothing is returned from the function, the breadcrumb is dropped
@@ -761,6 +767,24 @@ public void setBeforeSendTransaction(
     this.beforeSendTransaction = beforeSendTransaction;
   }
 
+  /**
+   * Returns the BeforeSendReplay callback
+   *
+   * @return the beforeSend callback or null if not set
+   */
+  public @Nullable BeforeSendReplayCallback getBeforeSendReplay() {
+    return beforeSendReplay;
+  }
+
+  /**
+   * Sets the beforeSendReplay callback
+   *
+   * @param beforeSendReplay the beforeSend callback
+   */
+  public void setBeforeSendReplay(@Nullable BeforeSendReplayCallback beforeSendReplay) {
+    this.beforeSendReplay = beforeSendReplay;
+  }
+
   /**
    * Returns the beforeBreadcrumb callback
    *
@@ -2493,6 +2517,23 @@ public interface BeforeSendTransactionCallback {
     SentryTransaction execute(@NotNull SentryTransaction transaction, @NotNull Hint hint);
   }
 
+  /** The BeforeSendReplay callback */
+  public interface BeforeSendReplayCallback {
+
+    /**
+     * Mutate or drop a replay event before being sent. Note that there might be many replay events
+     * for a single replay (i.e. segments), you can check {@link SentryReplayEvent#getReplayId()} to
+     * identify that the segments belong to the same replay.
+     *
+     * @param event the event
+     * @param hint the hint, contains {@link ReplayRecording}, can be accessed via {@link
+     *     Hint#getReplayRecording()}
+     * @return the original event or the mutated event or null if event was dropped
+     */
+    @Nullable
+    SentryReplayEvent execute(@NotNull SentryReplayEvent event, @NotNull Hint hint);
+  }
+
   /** The BeforeBreadcrumb callback */
   public interface BeforeBreadcrumbCallback {
 

sentry/src/test/java/io/sentry/SentryClientTest.kt

@@ -2800,6 +2800,68 @@ class SentryClientTest {
         assertFalse(called)
     }
 
+    @Test
+    fun `when beforeSendReplay is set, callback is invoked`() {
+        var invoked = false
+        fixture.sentryOptions.setBeforeSendReplay { replay: SentryReplayEvent, _: Hint -> invoked = true; replay }
+
+        fixture.getSut().captureReplayEvent(SentryReplayEvent(), Scope(fixture.sentryOptions), Hint())
+
+        assertTrue(invoked)
+    }
+
+    @Test
+    fun `when beforeSendReplay returns null, event is dropped`() {
+        fixture.sentryOptions.setBeforeSendReplay { replay: SentryReplayEvent, _: Hint -> null }
+
+        fixture.getSut().captureReplayEvent(SentryReplayEvent(), Scope(fixture.sentryOptions), Hint())
+
+        verify(fixture.transport, never()).send(any(), anyOrNull())
+
+        assertClientReport(
+            fixture.sentryOptions.clientReportRecorder,
+            listOf(
+                DiscardedEvent(DiscardReason.BEFORE_SEND.reason, DataCategory.Replay.category, 1)
+            )
+        )
+    }
+
+    @Test
+    fun `when beforeSendReplay returns new instance, new instance is sent`() {
+        val expected = SentryReplayEvent().apply { tags = mapOf("test" to "test") }
+        fixture.sentryOptions.setBeforeSendReplay { _, _ -> expected }
+
+        fixture.getSut().captureReplayEvent(SentryReplayEvent(), Scope(fixture.sentryOptions), Hint())
+
+        verify(fixture.transport).send(
+            check {
+                val replay = getReplayFromData(it.items.first().data)
+                assertEquals("test", replay!!.tags!!["test"])
+            },
+            anyOrNull()
+        )
+        verifyNoMoreInteractions(fixture.transport)
+    }
+
+    @Test
+    fun `when beforeSendReplay throws an exception, replay is dropped`() {
+        val exception = Exception("test")
+
+        exception.stackTrace.toString()
+        fixture.sentryOptions.setBeforeSendReplay { _, _ -> throw exception }
+
+        val id = fixture.getSut().captureReplayEvent(SentryReplayEvent(), Scope(fixture.sentryOptions), Hint())
+
+        assertEquals(SentryId.EMPTY_ID, id)
+
+        assertClientReport(
+            fixture.sentryOptions.clientReportRecorder,
+            listOf(
+                DiscardedEvent(DiscardReason.BEFORE_SEND.reason, DataCategory.Replay.category, 1)
+            )
+        )
+    }
+
     private fun givenScopeWithStartedSession(errored: Boolean = false, crashed: Boolean = false): IScope {
         val scope = createScope(fixture.sentryOptions)
         scope.startSession()
@@ -2977,6 +3039,25 @@ class SentryClientTest {
         )!!
     }
 
+    private fun getReplayFromData(data: ByteArray): SentryReplayEvent? {
+        val unpacker = MessagePack.newDefaultUnpacker(data)
+        val mapSize = unpacker.unpackMapHeader()
+        for (i in 0 until mapSize) {
+            val key = unpacker.unpackString()
+            when (key) {
+                SentryItemType.ReplayEvent.itemType -> {
+                    val replayEventLength = unpacker.unpackBinaryHeader()
+                    val replayEventBytes = unpacker.readPayload(replayEventLength)
+                    return fixture.sentryOptions.serializer.deserialize(
+                        InputStreamReader(replayEventBytes.inputStream()),
+                        SentryReplayEvent::class.java
+                    )!!
+                }
+            }
+        }
+        return null
+    }
+
     private fun verifyAttachmentsInEnvelope(eventId: SentryId?) {
         verify(fixture.transport).send(
             check { actual ->