Add signer action extension with shared keychain and data store

YetiSignerAction/YetiSignerActionViewController.swift

@@ -0,0 +1,81 @@
+//
+//  YetiSignerActionViewController.swift
+//  YetiSignerAction
+//
+//  Created by Terry Yiu on 1/26/25.
+//
+
+//import MobileCoreServices
+import SwiftUI
+import UIKit
+import UniformTypeIdentifiers
+
+class YetiSignerActionViewController: UIViewController {
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+
+        guard
+            let extensionItem = extensionContext?.inputItems.first as? NSExtensionItem,
+            let itemProvider = extensionItem.attachments?.first
+        else {
+            done()
+            return
+        }
+
+
+        let textDataType = UTType.plainText.identifier
+        guard itemProvider.hasItemConformingToTypeIdentifier(textDataType) else {
+            done()
+            return
+        }
+
+        itemProvider.loadItem(forTypeIdentifier: textDataType , options: nil) { (providedText, error) in
+            if let error {
+                self.done(signedEvent: error.localizedDescription)
+                return
+            }
+
+            if let text = providedText as? String {
+                DispatchQueue.main.async {
+                    let contentView = UIHostingController(rootView: YetiSignerActionView(text: text))
+                    self.addChild(contentView)
+                    self.view.addSubview(contentView.view)
+
+                    // set up constraints
+                    contentView.view.translatesAutoresizingMaskIntoConstraints = false
+                    contentView.view.topAnchor.constraint(equalTo: self.view.topAnchor).isActive = true
+                    contentView.view.bottomAnchor.constraint (equalTo: self.view.bottomAnchor).isActive = true
+                    contentView.view.leftAnchor.constraint(equalTo: self.view.leftAnchor).isActive = true
+                    contentView.view.rightAnchor.constraint (equalTo: self.view.rightAnchor).isActive = true
+                }
+            } else {
+                self.done()
+                return
+            }
+        }
+
+        NotificationCenter.default.addObserver(forName: NSNotification.Name("done"), object: nil, queue: nil) { notification in
+            DispatchQueue.main.async {
+                self.done(signedEvent: notification.object as? String)
+            }
+        }
+    }
+
+    func done(signedEvent: String? = nil) {
+        if let extensionContext = self.extensionContext {
+            if let signedEvent {
+                let itemProvider = NSItemProvider(
+                    item: signedEvent as NSSecureCoding?,
+                    typeIdentifier: UTType.text.identifier
+                )
+                let extensionItem = NSExtensionItem()
+                extensionItem.attachments = [itemProvider]
+                extensionContext.completeRequest(returningItems: [extensionItem], completionHandler: nil)
+            } else {
+                extensionContext.completeRequest(returningItems: [], completionHandler: nil)
+            }
+        }
+    }
+
+}