feat(push): capture a launch intent the SDK was installed too late to read

.changeset/push-open-late-install.md

@@ -0,0 +1,8 @@
+---
+'posthog': minor
+'posthog-android': minor
+'posthog-server': patch
+'posthog-android-surveys-compose': patch
+---
+
+Add `PostHogAndroid.capturePushNotificationOpened(intent)` to capture `$push_notification_opened` for a launch intent the SDK was installed too late to read.

posthog-android/api/posthog-android.api

@@ -11,6 +11,7 @@ public final class com/posthog/android/PostHogAndroid {
 }
 
 public final class com/posthog/android/PostHogAndroid$Companion {
+	public final fun capturePushNotificationOpened (Landroid/content/Intent;)V
 	public final fun setup (Landroid/content/Context;Lcom/posthog/android/PostHogAndroidConfig;)V
 	public final fun with (Landroid/content/Context;Lcom/posthog/android/PostHogAndroidConfig;)Lcom/posthog/PostHogInterface;
 }

posthog-android/src/main/java/com/posthog/android/PostHogAndroid.kt

@@ -2,9 +2,11 @@ package com.posthog.android
 
 import android.app.Application
 import android.content.Context
+import android.content.Intent
 import android.os.Build
 import com.posthog.PostHog
 import com.posthog.PostHogInterface
+import com.posthog.PostHogVisibleForTesting
 import com.posthog.android.errortracking.PostHogNativeCrashIntegration
 import com.posthog.android.internal.MainHandler
 import com.posthog.android.internal.PostHogActivityLifecycleCallbackIntegration
@@ -41,6 +43,54 @@ public class PostHogAndroid private constructor() {
     public companion object {
         private val lock = Any()
 
+        /**
+         * Retained so a host can hand the SDK a launch intent after setup; see
+         * [capturePushNotificationOpened]. Never cleared in production — a `close()` leaves the last
+         * config here.
+         */
+        @Volatile
+        private var androidConfig: PostHogAndroidConfig? = null
+
+        @PostHogVisibleForTesting
+        internal fun resetAndroidConfig() {
+            androidConfig = null
+        }
+
+        /**
+         * Captures `$push_notification_opened` for a notification tap carried on [intent].
+         *
+         * The SDK reads the tray intent when the launch Activity is created. A host that configures
+         * PostHog from its own runtime — Flutter and React Native reach `setup()` from Dart/JS, after
+         * the launch Activity has already created, started and resumed — installs too late to see that
+         * callback, and should pass the Activity's intent here instead.
+         *
+         * Deduped by `google.message_id`, so calling it alongside the automatic path cannot
+         * double-count, including across a process-death restore: on this path recently opened ids are
+         * remembered on disk, because a caller with no `savedInstanceState` cannot otherwise tell a
+         * restore — which hands the Activity back its original intent — from a real second tap. The
+         * cost of that trade is that a genuine second tap of the *same* notification after a process
+         * restart reads as a restore and is dropped, until that id ages out of the remembered set.
+         *
+         * No-op when [intent] is null or carries no push id, when `capturePushNotificationOpened` is
+         * disabled, or before [setup]. Events go to the shared instance, so a host that only called
+         * [with] is not served.
+         *
+         * Covers launch intents only. A warm-start tap arrives through `Activity.onNewIntent`, which
+         * nothing here observes — pass that intent in yourself.
+         */
+        public fun capturePushNotificationOpened(intent: Intent?) {
+            val config = androidConfig ?: return
+            if (!config.capturePushNotificationOpened) return
+            val pushIntent = intent ?: return
+
+            PostHogActivityLifecycleCallbackIntegration.capturePushNotificationOpened(
+                intent = pushIntent,
+                postHog = PostHog,
+                config = config,
+                usePersistedDedupe = true,
+            )
+        }
+
         /**
          * Sets up the SDK and stores it as the global singleton.
          *
@@ -55,6 +105,11 @@ public class PostHogAndroid private constructor() {
                 setAndroidConfig(context.appContext(), config)
 
                 PostHog.setup(config)
+
+                // Only setup() arms the manual entry point: with() builds a secondary instance whose
+                // config must not decide the gate, or the preferences file, for events that are
+                // delivered to the shared one.
+                androidConfig = config
             }
         }
 

posthog-android/src/main/java/com/posthog/android/internal/PostHogActivityLifecycleCallbackIntegration.kt

@@ -3,10 +3,13 @@ package com.posthog.android.internal
 import android.app.Activity
 import android.app.Application
 import android.app.Application.ActivityLifecycleCallbacks
+import android.content.Intent
 import android.os.Bundle
 import com.posthog.PostHogIntegration
 import com.posthog.PostHogInterface
+import com.posthog.PostHogVisibleForTesting
 import com.posthog.android.PostHogAndroidConfig
+import com.posthog.internal.PostHogPreferences.Companion.PUSH_OPENED_MESSAGE_IDS
 import java.util.concurrent.atomic.AtomicBoolean
 
 /**
@@ -21,13 +24,116 @@ internal class PostHogActivityLifecycleCallbackIntegration(
     private var postHog: PostHogInterface? = null
     private var ownsInstallation = false
 
-    @Volatile
-    private var lastHandledPushMessageId: String? = null
-
-    private companion object {
+    internal companion object {
         private val integrationInstalled = AtomicBoolean(false)
 
         private const val GOOGLE_MESSAGE_ID = "google.message_id"
+
+        /** Only the launch intent is redelivered after a process death, so a warm tap must not
+         * displace it. */
+        private const val PUSH_ID_HISTORY = 5
+        private const val PUSH_ID_SEPARATOR = "\n"
+
+        private val pushDedupeLock = Any()
+
+        /**
+         * Process-wide on purpose: a tap must not be re-captured after a `close()`/`setup()` cycle,
+         * and the static entry point has no integration instance to hang this on.
+         */
+        private var lastHandledPushMessageId: String? = null
+
+        @PostHogVisibleForTesting
+        internal fun resetPushDedupe() {
+            synchronized(pushDedupeLock) { lastHandledPushMessageId = null }
+        }
+
+        /**
+         * Captures `$push_notification_opened` for a tray tap carried on [intent], deduped by
+         * `google.message_id`. Title/body aren't in the tray intent (only the `posthog` JSON extra is).
+         *
+         * [usePersistedDedupe] additionally remembers the id on disk, so the dedupe outlives the
+         * process. Only callers with no restore signal need that: `onActivityCreated` has
+         * `savedInstanceState`, which is strictly better because it separates a restore from a genuine
+         * second tap of the same notification — a persisted id cannot tell those apart, and would drop
+         * the real one. Keeping the write behind the same flag means only hosts that opt in ever
+         * write this key.
+         */
+        internal fun capturePushNotificationOpened(
+            intent: Intent,
+            postHog: PostHogInterface?,
+            config: PostHogAndroidConfig,
+            usePersistedDedupe: Boolean = false,
+        ) {
+            // Reading extras unmarshals the whole Bundle; a launch intent carrying a
+            // Serializable/Parcelable extra whose class isn't on this app's classloader throws
+            // BadParcelableException here. An uncaught throw would surface in a framework callback or
+            // in host code, either way crashing the app.
+            try {
+                val target = postHog ?: return
+                // Marking an id the SDK will refuse to send would burn it for good, and an opt-in later
+                // in the session could never recover it.
+                if (target.isOptOut()) return
+
+                val messageId = intent.getStringExtra(GOOGLE_MESSAGE_ID) ?: return
+
+                // Check and mark under one lock: a second caller for the same id must not slip
+                // through while this one is still delivering.
+                val payload =
+                    synchronized(pushDedupeLock) {
+                        val persistedIds =
+                            if (usePersistedDedupe) persistedPushIds(config) else emptyList()
+                        if (messageId == lastHandledPushMessageId || messageId in persistedIds) {
+                            lastHandledPushMessageId = messageId
+                            // The automatic path marks memory only. Persisting on the way out of a hit
+                            // keeps a later restore — where that path is gated by savedInstanceState —
+                            // from capturing the same tap a second time.
+                            if (usePersistedDedupe && messageId !in persistedIds) {
+                                rememberPushId(config, messageId)
+                            }
+                            return
+                        }
+                        // Read the risky full Bundle first: if toMap() throws, the id stays unmarked so
+                        // a later activity (e.g. a trampoline) with a clean Bundle can retry.
+                        val extras = intent.extras?.toMap()
+                        lastHandledPushMessageId = messageId
+                        if (usePersistedDedupe) {
+                            rememberPushId(config, messageId)
+                        }
+                        extras
+                    }
+
+                target.capturePushNotificationOpened(
+                    title = null,
+                    body = null,
+                    payload = payload,
+                )
+            } catch (e: Throwable) {
+                config.logger.log("Failed to capture push notification opened: $e.")
+            }
+        }
+
+        private fun persistedPushIds(config: PostHogAndroidConfig): List<String> =
+            (config.cachePreferences?.getValue(PUSH_OPENED_MESSAGE_IDS) as? String)
+                ?.split(PUSH_ID_SEPARATOR)
+                ?.filter { it.isNotEmpty() }
+                ?: emptyList()
+
+        private fun rememberPushId(
+            config: PostHogAndroidConfig,
+            messageId: String,
+        ) {
+            val ids = (listOf(messageId) + persistedPushIds(config)).distinct().take(PUSH_ID_HISTORY)
+            config.cachePreferences?.setValue(PUSH_OPENED_MESSAGE_IDS, ids.joinToString(PUSH_ID_SEPARATOR))
+        }
+
+        private fun Bundle.toMap(): Map<String, Any?> {
+            val map = mutableMapOf<String, Any?>()
+            for (key in keySet()) {
+                @Suppress("DEPRECATION")
+                map[key] = get(key)
+            }
+            return map
+        }
     }
 
     override fun onActivityCreated(
@@ -66,45 +172,9 @@ internal class PostHogActivityLifecycleCallbackIntegration(
         }
     }
 
-    /**
-     * Captures `$push_notification_opened` for a cold-start tray tap, detected via the launch intent's
-     * `google.message_id`. Title/body aren't in the tray intent (only the `posthog` JSON extra is);
-     * warm-start `onNewIntent` and foreground data messages need the manual API. The message-id guard
-     * dedupes repeat reads within a process; the caller gates on a fresh launch to skip recreations.
-     */
     private fun capturePushNotificationOpenedIfNeeded(activity: Activity) {
         val intent = activity.intent ?: return
-        // Reading extras unmarshals the whole Bundle; a launch intent carrying a Serializable/Parcelable
-        // extra whose class isn't on this app's classloader throws BadParcelableException here. This runs
-        // inside the framework onActivityCreated callback, so an uncaught throw crashes the host app.
-        try {
-            val messageId = intent.getStringExtra(GOOGLE_MESSAGE_ID) ?: return
-
-            if (messageId == lastHandledPushMessageId) {
-                return
-            }
-            // Read the risky full Bundle before marking handled: if toMap() throws, the id must
-            // stay unmarked so a later activity (e.g. a trampoline) with a clean Bundle can retry.
-            val payload = intent.extras?.toMap()
-            lastHandledPushMessageId = messageId
-
-            postHog?.capturePushNotificationOpened(
-                title = null,
-                body = null,
-                payload = payload,
-            )
-        } catch (e: Throwable) {
-            config.logger.log("Failed to capture push notification opened: $e.")
-        }
-    }
-
-    private fun Bundle.toMap(): Map<String, Any?> {
-        val map = mutableMapOf<String, Any?>()
-        for (key in keySet()) {
-            @Suppress("DEPRECATION")
-            map[key] = get(key)
-        }
-        return map
+        capturePushNotificationOpened(intent, postHog, config)
     }
 
     override fun onActivityStarted(activity: Activity) {

posthog-android/src/test/java/com/posthog/android/PostHogAndroidTest.kt

@@ -1,6 +1,7 @@
 package com.posthog.android
 
 import android.content.Context
+import android.content.Intent
 import androidx.test.ext.junit.runners.AndroidJUnit4
 import com.posthog.PostHog
 import com.posthog.android.errortracking.PostHogNativeCrashIntegration
@@ -14,7 +15,9 @@ import com.posthog.android.internal.PostHogLifecycleObserverIntegration
 import com.posthog.android.internal.PostHogPushSubscriptionIntegration
 import com.posthog.android.internal.PostHogSharedPreferences
 import com.posthog.internal.PostHogLogger
+import com.posthog.internal.PostHogMemoryPreferences
 import com.posthog.internal.PostHogNetworkStatus
+import com.posthog.internal.PostHogPreferences.Companion.PUSH_OPENED_MESSAGE_IDS
 import org.junit.Rule
 import org.junit.rules.TemporaryFolder
 import org.junit.runner.RunWith
@@ -38,6 +41,9 @@ internal class PostHogAndroidTest {
     @BeforeTest
     fun `set up`() {
         PostHog.close()
+        // androidConfig is a never-cleared process-wide static; without this the manual push entry
+        // stays armed from whichever test ran last.
+        PostHogAndroid.resetAndroidConfig()
     }
 
     @AfterTest
@@ -59,6 +65,39 @@ internal class PostHogAndroidTest {
         assertTrue(logger.messages.any { it.contains("PostHog SDK is disabled because the API key is required") })
     }
 
+    @Test
+    fun `the manual entry is inert before setup and while the feature is disabled`() {
+        mockContextAppStart(context, tmpDir)
+        val intent = Intent().putExtra("google.message_id", "manual-entry")
+
+        // Before setup(): no config, so nothing is armed and nothing is persisted.
+        PostHogAndroid.capturePushNotificationOpened(intent)
+
+        val config = PostHogAndroidConfig(API_KEY).apply { capturePushNotificationOpened = false }
+        PostHogAndroid.setup(context, config)
+        // Armed now, but the feature is disabled, so still nothing.
+        PostHogAndroid.capturePushNotificationOpened(intent)
+
+        assertNull(config.cachePreferences?.getValue(PUSH_OPENED_MESSAGE_IDS))
+    }
+
+    @Test
+    fun `with after setup must not redirect the manual entry to the secondary project`() {
+        mockContextAppStart(context, tmpDir)
+        val primaryPrefs = PostHogMemoryPreferences()
+        val secondaryPrefs = PostHogMemoryPreferences()
+
+        PostHogAndroid.setup(context, PostHogAndroidConfig(API_KEY).apply { cachePreferences = primaryPrefs })
+        PostHogAndroid.with(context, PostHogAndroidConfig(API_KEY_2).apply { cachePreferences = secondaryPrefs })
+
+        PostHogAndroid.capturePushNotificationOpened(Intent().putExtra("google.message_id", "probe"))
+
+        // The event goes to the shared instance, so the dedupe id must land in its preferences —
+        // never in the secondary project's file.
+        assertEquals("probe", primaryPrefs.getValue(PUSH_OPENED_MESSAGE_IDS))
+        assertNull(secondaryPrefs.getValue(PUSH_OPENED_MESSAGE_IDS))
+    }
+
     @Test
     fun `sets Android Logger if System logger`() {
         val config = PostHogAndroidConfig(API_KEY)

posthog-android/src/test/java/com/posthog/android/Utils.kt

@@ -25,6 +25,7 @@ import org.mockito.kotlin.mock
 import org.mockito.kotlin.whenever
 
 public const val API_KEY: String = "_6SG-F7I1vCuZ-HdJL3VZQqjBlaSb1_20hDPwqMNnGI"
+public const val API_KEY_2: String = "_6SG-F7I1vCuZ-HdJL3VZQqjBlaSb1_20hDPwqMNnG2"
 
 public fun mockActivityUri(
     uri: String,