Add signer action extension with shared keychain and data store

YetiSignerAction/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>NSExtensionAttributes</key>
+		<dict>
+			<key>NSExtensionActivationRule</key>
+			<dict>
+				<key>NSExtensionActivationSupportsText</key>
+				<true/>
+			</dict>
+			<key>NSExtensionServiceAllowsFinderPreviewItem</key>
+			<true/>
+			<key>NSExtensionServiceAllowsTouchBarItem</key>
+			<true/>
+			<key>NSExtensionServiceFinderPreviewIconName</key>
+			<string>NSActionTemplate</string>
+			<key>NSExtensionServiceTouchBarBezelColorName</key>
+			<string>TouchBarBezel</string>
+			<key>NSExtensionServiceTouchBarIconName</key>
+			<string>NSActionTemplate</string>
+		</dict>
+		<key>NSExtensionPrincipalClass</key>
+		<string>YetiSignerAction.YetiSignerActionViewController</string>
+		<key>NSExtensionPointIdentifier</key>
+		<string>com.apple.ui-services</string>
+	</dict>
+</dict>
+</plist>

YetiSignerAction/Media.xcassets/Contents.json

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+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

YetiSignerAction/Media.xcassets/TouchBarBezel.colorset/Contents.json

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+{
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  },
+  "colors" : [
+    {
+      "idiom" : "mac",
+      "color" : {
+        "reference" : "systemPurpleColor"
+      }
+    }
+  ]
+}

YetiSignerAction/YetiSignerAction.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>com.apple.security.application-groups</key>
+	<array>
+		<string>group.xyz.tyiu.Yeti</string>
+	</array>
+	<key>keychain-access-groups</key>
+	<array>
+		<string>$(AppIdentifierPrefix)xyz.tyiu.Yeti.SharedKeychain</string>
+	</array>
+</dict>
+</plist>

YetiSignerAction/YetiSignerActionView.swift

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+//
+//  YetiSignerActionView.swift
+//  YetiSignerAction
+//
+//  Created by Terry Yiu on 1/26/25.
+//
+
+import NostrSDK
+import SwiftUI
+
+struct YetiSignerActionView: View {
+    @State private var text: String
+    @State private var result: String = ""
+
+    init(text: String) {
+        self.text = text
+    }
+
+    var body: some View {
+        EmptyView()
+            .onAppear {
+                do {
+                    try sign()
+                    done()
+                } catch {
+                    result = error.localizedDescription
+                }
+            }
+    }
+
+    func sign() throws {
+        let data = Data(text.utf8)
+        let unsignedNostrEvent = try JSONDecoder().decode(NostrEvent.self, from: data)
+        let pubkey = unsignedNostrEvent.pubkey
+        if let publicKey = PublicKey(hex: pubkey),
+           let keypair = PrivateKeySecureStorage.shared.keypair(for: publicKey) {
+            let signedNostrEvent = try NostrEvent.Builder(nostrEvent: unsignedNostrEvent)
+                .build(signedBy: keypair)
+
+            let encodedSignedEvent = try JSONEncoder().encode(signedNostrEvent)
+            let encodedSignedEventString = String(data: encodedSignedEvent, encoding: .utf8)!
+
+            self.result = encodedSignedEventString
+        }
+    }
+
+    func done() {
+        NotificationCenter.default.post(name: NSNotification.Name("done"), object: result)
+    }
+}
+
+#Preview {
+    YetiSignerActionView(text: "Hello, world!")
+}

YetiSignerAction/YetiSignerActionViewController.swift

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+//
+//  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)
+            }
+        }
+    }
+
+}