feat: add get session id (#134)

CHANGELOG.md

@@ -1,4 +1,5 @@
 ## Next
+  - feat: add getter for current session identifier ([#134](https://github.com/PostHog/posthog-flutter/pull/134))
 
 ## 4.8.0
 

android/src/main/kotlin/com/posthog/flutter/PosthogFlutterPlugin.kt

@@ -156,6 +156,9 @@ class PosthogFlutterPlugin :
             "isSessionReplayActive" -> {
                 result.success(isSessionReplayActive())
             }
+            "getSessionId" -> {
+                getSessionId(result)
+            }
             else -> {
                 result.notImplemented()
             }
@@ -500,6 +503,15 @@ class PosthogFlutterPlugin :
         }
     }
 
+    private fun getSessionId(result: Result) {
+        try {
+            val sessionId = PostHog.getSessionId()
+            result.success(sessionId?.toString())
+        } catch (e: Throwable) {
+            result.error("PosthogFlutterException", e.localizedMessage, null)
+        }
+    }
+
     // Call the `completion` closure if cast to map value with `key` and type `T` is successful.
     @Suppress("UNCHECKED_CAST")
     private fun <T> Map<String, Any>.getIfNotNull(

example/web/index.html

@@ -41,7 +41,7 @@
   <script src="flutter.js" defer></script>
   <script>
     !function(t,e){var o,n,p,r;e.__SV||(window.posthog=e,e._i=[],e.init=function(i,s,a){function g(t,e){var o=e.split(".");2==o.length&&(t=t[o[0]],e=o[1]),t[e]=function(){t.push([e].concat(Array.prototype.slice.call(arguments,0)))}}(p=t.createElement("script")).type="text/javascript",p.async=!0,p.src=s.api_host+"/static/array.js",(r=t.getElementsByTagName("script")[0]).parentNode.insertBefore(p,r);var u=e;for(void 0!==a?u=e[a]=[]:a="posthog",u.people=u.people||[],u.toString=function(t){var e="posthog";return"posthog"!==a&&(e+="."+a),t||(e+=" (stub)"),e},u.people.toString=function(){return u.toString(1)+".people (stub)"},o="capture identify alias people.set people.set_once set_config register register_once unregister opt_out_capturing has_opted_out_capturing opt_in_capturing reset isFeatureEnabled onFeatureFlags getFeatureFlag getFeatureFlagPayload reloadFeatureFlags group updateEarlyAccessFeatureEnrollment getEarlyAccessFeatures getActiveMatchingSurveys getSurveys onSessionId".split(" "),n=0;n<o.length;n++)g(u,o[n]);e._i.push([i,s,a])},e.__SV=1)}(document,window.posthog||[]);
-    posthog.init('phc_pQ70jJhZKHRvDIL5ruOErnPy6xiAiWCqlL4ayELj4X8', {api_host: 'https://us.i.posthog.com'})
+    posthog.init('phc_QFbR1y41s5sxnNTZoyKG2NJo2RlsCIWkUfdpawgb40D', {api_host: 'https://us.i.posthog.com'})
   </script>
 </head>
 

ios/Classes/PosthogFlutterPlugin.swift

@@ -170,6 +170,8 @@ public class PosthogFlutterPlugin: NSObject, FlutterPlugin {
             sendFullSnapshot(call, result: result)
         case "isSessionReplayActive":
             isSessionReplayActive(result: result)
+        case "getSessionId":
+            getSessionId(result: result)
         default:
             result(FlutterMethodNotImplemented)
         }
@@ -499,6 +501,10 @@ public class PosthogFlutterPlugin: NSObject, FlutterPlugin {
         result(nil)
     }
 
+    private func getSessionId(result: @escaping FlutterResult) {
+        result(PostHogSDK.shared.getSessionId())
+    }
+
     // Return bad Arguments error
     private func _badArgumentError(_ result: @escaping FlutterResult) {
         result(FlutterError(

lib/posthog_flutter_web.dart

@@ -3,6 +3,7 @@
 // package as the core of your plugin.
 // ignore: avoid_web_libraries_in_flutter
 import 'dart:js';
+
 import 'package:flutter/services.dart';
 import 'package:flutter_web_plugins/flutter_web_plugins.dart';
 

lib/src/posthog.dart

@@ -125,5 +125,7 @@ class Posthog {
     return _posthog.close();
   }
 
+  Future<String?> getSessionId() => _posthog.getSessionId();
+
   Posthog._internal();
 }

lib/src/posthog_flutter_io.dart

@@ -229,4 +229,15 @@ class PosthogFlutterIO extends PosthogFlutterPlatformInterface {
       printIfDebug('Exeption on close: $exception');
     }
   }
+
+  @override
+  Future<String?> getSessionId() async {
+    try {
+      final sessionId = await _methodChannel.invokeMethod('getSessionId');
+      return sessionId;
+    } on PlatformException catch (exception) {
+      printIfDebug('Exception on getSessionId: $exception');
+      return null;
+    }
+  }
 }

lib/src/posthog_flutter_platform_interface.dart

@@ -120,5 +120,9 @@ abstract class PosthogFlutterPlatformInterface extends PlatformInterface {
     throw UnimplementedError('close() has not been implemented.');
   }
 
+  Future<String?> getSessionId() async {
+    throw UnimplementedError('getSessionId() not implemented');
+  }
+
   // TODO: missing capture with more parameters
 }

lib/src/posthog_flutter_web_handler.dart

@@ -43,6 +43,7 @@ Future<dynamic> handleWebMethodCall(MethodCall call, JsObject context) async {
       break;
     case 'distinctId':
       final distinctId = analytics.callMethod('get_distinct_id');
+
       return distinctId;
     case 'reset':
       analytics.callMethod('reset');
@@ -54,8 +55,9 @@ Future<dynamic> handleWebMethodCall(MethodCall call, JsObject context) async {
       break;
     case 'isFeatureEnabled':
       final isFeatureEnabled = analytics.callMethod('isFeatureEnabled', [
-        call.arguments['key'],
-      ]);
+            call.arguments['key'],
+          ]) as bool? ??
+          false;
       return isFeatureEnabled;
     case 'group':
       analytics.callMethod('group', [
@@ -94,6 +96,12 @@ Future<dynamic> handleWebMethodCall(MethodCall call, JsObject context) async {
         call.arguments['key'],
       ]);
       break;
+    case 'getSessionId':
+      final sessionId = analytics.callMethod('get_session_id') as String?;
+
+      if (sessionId?.isEmpty == true) return null;
+
+      return sessionId;
     case 'flush':
       // not supported on Web
       // analytics.callMethod('flush');