Add iOS Share Extension support

- Create share extension to handle shared content from other apps
- Support sharing text, URLs, and prepare for future image support
- Use app groups for data sharing between extension and main app
- Add URL scheme handling for app communication
- Add entitlements for app groups
- Display system message when content is shared
- Update project configuration to include share extension

bitchat/BitchatApp.swift

@@ -26,6 +26,14 @@ struct BitchatApp: App {
                 .environmentObject(chatViewModel)
                 .onAppear {
                     NotificationDelegate.shared.chatViewModel = chatViewModel
+                    #if os(iOS)
+                    appDelegate.chatViewModel = chatViewModel
+                    #endif
+                    // Check for shared content
+                    checkForSharedContent()
+                }
+                .onOpenURL { url in
+                    handleURL(url)
                 }
         }
         #if os(macOS)
@@ -33,10 +41,57 @@ struct BitchatApp: App {
         .windowResizability(.contentSize)
         #endif
     }
+    
+    private func handleURL(_ url: URL) {
+        if url.scheme == "bitchat" && url.host == "share" {
+            // Handle shared content
+            checkForSharedContent()
+        }
+    }
+    
+    private func checkForSharedContent() {
+        // Check app group for shared content from extension
+        guard let userDefaults = UserDefaults(suiteName: "group.chat.bitchat"),
+              let sharedContent = userDefaults.string(forKey: "sharedContent"),
+              let sharedDate = userDefaults.object(forKey: "sharedContentDate") as? Date else {
+            return
+        }
+        
+        // Only process if shared within last 30 seconds
+        if Date().timeIntervalSince(sharedDate) < 30 {
+            let contentType = userDefaults.string(forKey: "sharedContentType") ?? "text"
+            
+            // Clear the shared content
+            userDefaults.removeObject(forKey: "sharedContent")
+            userDefaults.removeObject(forKey: "sharedContentType")
+            userDefaults.removeObject(forKey: "sharedContentDate")
+            userDefaults.synchronize()
+            
+            // Show notification about shared content
+            DispatchQueue.main.async {
+                // Add system message about sharing
+                let systemMessage = BitchatMessage(
+                    sender: "system",
+                    content: "preparing to share \(contentType)...",
+                    timestamp: Date(),
+                    isRelay: false
+                )
+                self.chatViewModel.messages.append(systemMessage)
+            }
+            
+            // Send the shared content after a short delay
+            DispatchQueue.main.asyncAfter(deadline: .now() + 1.0) {
+                let prefix = contentType == "url" ? "Shared link: " : ""
+                self.chatViewModel.sendMessage(prefix + sharedContent)
+            }
+        }
+    }
 }
 
 #if os(iOS)
 class AppDelegate: NSObject, UIApplicationDelegate {
+    weak var chatViewModel: ChatViewModel?
+    
     func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
         return true
     }

bitchat/Info.plist

@@ -40,5 +40,16 @@
 	<array>
 		<string>UIInterfaceOrientationPortrait</string>
 	</array>
+	<key>CFBundleURLTypes</key>
+	<array>
+		<dict>
+			<key>CFBundleURLSchemes</key>
+			<array>
+				<string>bitchat</string>
+			</array>
+			<key>CFBundleURLName</key>
+			<string>chat.bitchat</string>
+		</dict>
+	</array>
 </dict>
 </plist>

bitchat/bitchat.entitlements

@@ -0,0 +1,12 @@
+<?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.app-sandbox</key>
+	<true/>
+	<key>com.apple.security.application-groups</key>
+	<array>
+		<string>group.chat.bitchat</string>
+	</array>
+</dict>
+</plist>

bitchatShareExtension/Info.plist

@@ -0,0 +1,43 @@
+<?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>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleDisplayName</key>
+	<string>bitchat</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>$(PRODUCT_BUNDLE_PACKAGE_TYPE)</string>
+	<key>CFBundleShortVersionString</key>
+	<string>$(MARKETING_VERSION)</string>
+	<key>CFBundleVersion</key>
+	<string>$(CURRENT_PROJECT_VERSION)</string>
+	<key>NSExtension</key>
+	<dict>
+		<key>NSExtensionAttributes</key>
+		<dict>
+			<key>NSExtensionActivationRule</key>
+			<dict>
+				<key>NSExtensionActivationSupportsText</key>
+				<true/>
+				<key>NSExtensionActivationSupportsWebURLWithMaxCount</key>
+				<integer>1</integer>
+				<key>NSExtensionActivationSupportsImageWithMaxCount</key>
+				<integer>1</integer>
+			</dict>
+		</dict>
+		<key>NSExtensionPrincipalClass</key>
+		<string>$(PRODUCT_MODULE_NAME).ShareViewController</string>
+		<key>NSExtensionPointIdentifier</key>
+		<string>com.apple.share-services</string>
+	</dict>
+</dict>
+</plist>

bitchatShareExtension/ShareViewController.swift

@@ -0,0 +1,122 @@
+//
+// ShareViewController.swift
+// bitchatShareExtension
+//
+// This is free and unencumbered software released into the public domain.
+// For more information, see <https://unlicense.org>
+//
+
+import UIKit
+import Social
+import UniformTypeIdentifiers
+
+class ShareViewController: SLComposeServiceViewController {
+    
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        // Set placeholder text
+        placeholder = "Share to bitchat..."
+        // Set character limit (optional)
+        charactersRemaining = 500
+    }
+    
+    override func isContentValid() -> Bool {
+        // Validate that we have text content or attachments
+        if let text = contentText, !text.isEmpty {
+            return true
+        }
+        // Check if we have attachments
+        if let item = extensionContext?.inputItems.first as? NSExtensionItem,
+           let attachments = item.attachments,
+           !attachments.isEmpty {
+            return true
+        }
+        return false
+    }
+    
+    override func didSelectPost() {
+        // Get the shared content
+        guard let extensionItem = extensionContext?.inputItems.first as? NSExtensionItem else {
+            self.extensionContext?.completeRequest(returningItems: nil, completionHandler: nil)
+            return
+        }
+        
+        // Process different types of shared content
+        for itemProvider in extensionItem.attachments ?? [] {
+            if itemProvider.hasItemConformingToTypeIdentifier(UTType.plainText.identifier) {
+                itemProvider.loadItem(forTypeIdentifier: UTType.plainText.identifier, options: nil) { [weak self] (item, error) in
+                    if let text = item as? String {
+                        self?.handleSharedText(text)
+                    }
+                }
+            } else if itemProvider.hasItemConformingToTypeIdentifier(UTType.url.identifier) {
+                itemProvider.loadItem(forTypeIdentifier: UTType.url.identifier, options: nil) { [weak self] (item, error) in
+                    if let url = item as? URL {
+                        self?.handleSharedURL(url)
+                    }
+                }
+            } else if itemProvider.hasItemConformingToTypeIdentifier(UTType.image.identifier) {
+                itemProvider.loadItem(forTypeIdentifier: UTType.image.identifier, options: nil) { [weak self] (item, error) in
+                    if let image = item as? UIImage {
+                        self?.handleSharedImage(image)
+                    } else if let data = item as? Data {
+                        if let image = UIImage(data: data) {
+                            self?.handleSharedImage(image)
+                        }
+                    }
+                }
+            }
+        }
+        
+        // If we have content text, share it
+        if let text = contentText, !text.isEmpty {
+            handleSharedText(text)
+        }
+        
+        // Complete the share action
+        self.extensionContext?.completeRequest(returningItems: nil, completionHandler: nil)
+    }
+    
+    override func configurationItems() -> [Any]! {
+        // No configuration items needed
+        return []
+    }
+    
+    // MARK: - Helper Methods
+    
+    private func handleSharedText(_ text: String) {
+        // Save to shared user defaults to pass to main app
+        saveToSharedDefaults(content: text, type: "text")
+        openMainApp()
+    }
+    
+    private func handleSharedURL(_ url: URL) {
+        // Convert URL to text and share
+        let text = url.absoluteString
+        saveToSharedDefaults(content: text, type: "url")
+        openMainApp()
+    }
+    
+    private func handleSharedImage(_ image: UIImage) {
+        // For now, we'll just notify that image sharing isn't supported
+        // In the future, we could implement image sharing via the mesh
+        saveToSharedDefaults(content: "Image sharing coming soon!", type: "image")
+        openMainApp()
+    }
+    
+    private func saveToSharedDefaults(content: String, type: String) {
+        // Use app groups to share data between extension and main app
+        if let userDefaults = UserDefaults(suiteName: "group.chat.bitchat") {
+            userDefaults.set(content, forKey: "sharedContent")
+            userDefaults.set(type, forKey: "sharedContentType")
+            userDefaults.set(Date(), forKey: "sharedContentDate")
+            userDefaults.synchronize()
+        }
+    }
+    
+    private func openMainApp() {
+        // Note: Share extensions cannot directly open the containing app
+        // The user will need to tap on the notification or manually open the app
+        // to see the shared content
+    }
+}

bitchatShareExtension/bitchatShareExtension.entitlements

@@ -0,0 +1,12 @@
+<?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.app-sandbox</key>
+	<true/>
+	<key>com.apple.security.application-groups</key>
+	<array>
+		<string>group.chat.bitchat</string>
+	</array>
+</dict>
+</plist>

project.yml

@@ -47,6 +47,32 @@ targets:
       CODE_SIGNING_ALLOWED: YES
       ASSETCATALOG_COMPILER_APPICON_NAME: AppIcon
       ASSETCATALOG_COMPILER_INCLUDE_ALL_APPICON_ASSETS: YES
+      CODE_SIGN_ENTITLEMENTS: bitchat/bitchat.entitlements
+    dependencies:
+      - target: bitchatShareExtension
+        platformFilter: ios
+        embed: true
+        
+  bitchatShareExtension:
+    type: app-extension
+    platform: iOS
+    sources:
+      - bitchatShareExtension
+    info:
+      path: bitchatShareExtension/Info.plist
+      properties:
+        CFBundleDisplayName: bitchat
+        CFBundleShortVersionString: $(MARKETING_VERSION)
+        CFBundleVersion: $(CURRENT_PROJECT_VERSION)
+    settings:
+      PRODUCT_BUNDLE_IDENTIFIER: chat.bitchat.ShareExtension
+      INFOPLIST_FILE: bitchatShareExtension/Info.plist
+      SWIFT_VERSION: 5.0
+      IPHONEOS_DEPLOYMENT_TARGET: 16.0
+      CODE_SIGN_STYLE: Automatic
+      CODE_SIGNING_REQUIRED: YES
+      CODE_SIGNING_ALLOWED: YES
+      CODE_SIGN_ENTITLEMENTS: bitchatShareExtension/bitchatShareExtension.entitlements
 
   bitchatTests_iOS:
     type: bundle.unit-test