initial

ios/ImageNotification/ImageNotification.entitlements

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>aps-environment</key>
+	<string>development</string>
+</dict>
+</plist>

ios/ImageNotification/Info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>NSExtension</key>
+	<dict>
+		<key>NSExtensionPointIdentifier</key>
+		<string>com.apple.usernotifications.service</string>
+		<key>NSExtensionPrincipalClass</key>
+		<string>NotificationService</string>
+	</dict>
+</dict>
+</plist>

ios/ImageNotification/NotificationService.h

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+//
+//  NotificationService.h
+//  ImageNotification
+//
+//  Created by Nils Weber on 04.02.22.
+//
+
+#import <UserNotifications/UserNotifications.h>
+
+@interface NotificationService : UNNotificationServiceExtension
+
+@end

ios/ImageNotification/NotificationService.m

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+//
+//  NotificationService.m
+//  ImageNotification
+//
+//  Created by Nils Weber on 04.02.22.
+//
+
+#import "NotificationService.h"
+#import "FirebaseMessaging.h"
+
+@interface NotificationService ()
+
+@property (nonatomic, strong) void (^contentHandler)(UNNotificationContent *contentToDeliver);
+@property (nonatomic, strong) UNMutableNotificationContent *bestAttemptContent;
+
+@end
+
+@implementation NotificationService
+
+- (void)didReceiveNotificationRequest:(UNNotificationRequest *)request withContentHandler:(void (^)(UNNotificationContent * _Nonnull))contentHandler {
+    self.contentHandler = contentHandler;
+    self.bestAttemptContent = [request.content mutableCopy];
+    
+    [[FIRMessaging extensionHelper] populateNotificationContent:self.bestAttemptContent withContentHandler:contentHandler];
+}
+
+- (void)serviceExtensionTimeWillExpire {
+    // Called just before the extension will be terminated by the system.
+    // Use this as an opportunity to deliver your "best attempt" at modified content, otherwise the original push payload will be used.
+    self.contentHandler(self.bestAttemptContent);
+}
+
+@end