Decrypt push notifications

NotificationExtension/Info.plist

@@ -0,0 +1,22 @@
+<?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>TuskerInfo</key>
+	<dict>
+		<key>PushProxyHost</key>
+		<string>$(TUSKER_PUSH_PROXY_HOST)</string>
+		<key>PushProxyScheme</key>
+		<string>$(TUSKER_PUSH_PROXY_SCHEME)</string>
+		<key>SentryDSN</key>
+		<string>$(SENTRY_DSN)</string>
+	</dict>
+	<key>NSExtension</key>
+	<dict>
+		<key>NSExtensionPointIdentifier</key>
+		<string>com.apple.usernotifications.service</string>
+		<key>NSExtensionPrincipalClass</key>
+		<string>$(PRODUCT_MODULE_NAME).NotificationService</string>
+	</dict>
+</dict>
+</plist>

NotificationExtension/NotificationExtension.entitlements

@@ -0,0 +1,14 @@
+<?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.$(BUNDLE_ID_PREFIX).Tusker</string>
+	</array>
+	<key>com.apple.security.network.client</key>
+	<true/>
+</dict>
+</plist>

NotificationExtension/NotificationService.swift

@@ -0,0 +1,150 @@
+//
+//  NotificationService.swift
+//  NotificationExtension
+//
+//  Created by Shadowfacts on 4/9/24.
+//  Copyright © 2024 Shadowfacts. All rights reserved.
+//
+
+import UserNotifications
+import UserAccounts
+import PushNotifications
+import CryptoKit
+import OSLog
+import Pachyderm
+
+private let logger = Logger(subsystem: Bundle.main.bundleIdentifier!, category: "NotificationService")
+
+class NotificationService: UNNotificationServiceExtension {
+
+    override func didReceive(_ request: UNNotificationRequest, withContentHandler contentHandler: @escaping (UNNotificationContent) -> Void) {
+        guard let mutableContent = request.content.mutableCopy() as? UNMutableNotificationContent else {
+            contentHandler(request.content)
+            return
+        }
+        
+        guard request.content.userInfo["v"] as? Int == 1,
+              let accountID = request.content.userInfo["ctx"] as? String,
+              let account = UserAccountsManager.shared.getAccount(id: accountID),
+              let subscription = getSubscription(account: account),
+              let encryptedBody = (request.content.userInfo["data"] as? String).flatMap({ Data(base64Encoded: $0) }),
+              let salt = (request.content.userInfo["salt"] as? String).flatMap(decodeBase64URL(_:)),
+              let serverPublicKeyData = (request.content.userInfo["pk"] as? String).flatMap(decodeBase64URL(_:)) else {
+            logger.error("Missing info from push notification")
+            contentHandler(request.content)
+            return
+        }
+        
+        guard let body = decryptNotification(subscription: subscription, serverPublicKeyData: serverPublicKeyData, salt: salt, encryptedBody: encryptedBody) else {
+            contentHandler(request.content)
+            return
+        }
+
+        let withoutPadding = body.dropFirst(2)
+        
+        let notification: PushNotification
+        do {
+            notification = try JSONDecoder().decode(PushNotification.self, from: withoutPadding)
+        } catch {
+            logger.error("Unable to decode push payload: \(String(describing: error))")
+            contentHandler(request.content)
+            return
+        }
+        
+        mutableContent.title = notification.title
+        mutableContent.body = notification.body
+        
+        contentHandler(mutableContent)
+    }
+    
+    override func serviceExtensionTimeWillExpire() {
+    }
+    
+    private func getSubscription(account: UserAccountInfo) -> PushNotifications.PushSubscription? {
+        DispatchQueue.main.sync {
+            // this is necessary because of a swift bug: https://github.com/apple/swift/pull/72507
+            MainActor.runUnsafely {
+                PushManager.shared.pushSubscription(account: account)
+            }
+        }
+    }
+    
+    private func decryptNotification(subscription: PushNotifications.PushSubscription, serverPublicKeyData: Data, salt: Data, encryptedBody: Data) -> Data? {
+        // See https://github.com/ClearlyClaire/webpush/blob/f14a4d52e201128b1b00245d11b6de80d6cfdcd9/lib/webpush/encryption.rb
+        
+        var context = Data()
+        context.append(0)
+        let clientPublicKey = subscription.secretKey.publicKey.x963Representation
+        let clientPublicKeyLength = UInt16(clientPublicKey.count)
+        context.append(UInt8((clientPublicKeyLength >> 8) & 0xFF))
+        context.append(UInt8(clientPublicKeyLength & 0xFF))
+        context.append(clientPublicKey)
+        let serverPublicKeyLength = UInt16(serverPublicKeyData.count)
+        context.append(UInt8((serverPublicKeyLength >> 8) & 0xFF))
+        context.append(UInt8(serverPublicKeyLength & 0xFF))
+        context.append(serverPublicKeyData)
+        
+        func info(encoding: String) -> Data {
+            var info = Data("Content-Encoding: \(encoding)\0P-256".utf8)
+            info.append(context)
+            return info
+        }
+
+        let sharedSecret: SharedSecret
+        do {
+            let serverPublicKey = try P256.KeyAgreement.PublicKey(x963Representation: serverPublicKeyData)
+            sharedSecret = try subscription.secretKey.sharedSecretFromKeyAgreement(with: serverPublicKey)
+        } catch {
+            logger.error("Error getting shared secret: \(String(describing: error))")
+            return nil
+        }
+        
+        let sharedInfo = Data("Content-Encoding: auth\0".utf8)
+        let pseudoRandomKey = sharedSecret.hkdfDerivedSymmetricKey(using: SHA256.self, salt: subscription.authSecret, sharedInfo: sharedInfo, outputByteCount: 32)
+        let contentEncryptionKeyInfo = info(encoding: "aesgcm")
+        let contentEncryptionKey = HKDF<SHA256>.deriveKey(inputKeyMaterial: pseudoRandomKey, salt: salt, info: contentEncryptionKeyInfo, outputByteCount: 16)
+        let nonceInfo = info(encoding: "nonce")
+        let nonce = HKDF<SHA256>.deriveKey(inputKeyMaterial: pseudoRandomKey, salt: salt, info: nonceInfo, outputByteCount: 12)
+        
+        let nonceAndEncryptedBody = nonce.withUnsafeBytes { noncePtr in
+            var data = Data(buffer: noncePtr.bindMemory(to: UInt8.self))
+            data.append(encryptedBody)
+            return data
+        }
+        do {
+            let sealedBox = try AES.GCM.SealedBox(combined: nonceAndEncryptedBody)
+            let decrypted = try AES.GCM.open(sealedBox, using: contentEncryptionKey)
+            return decrypted
+        } catch {
+            logger.error("Error decrypting push: \(String(describing: error))")
+            return nil
+        }
+    }
+
+}
+
+extension MainActor {
+    @_unavailableFromAsync
+    @available(macOS, obsoleted: 14.0)
+    @available(iOS, obsoleted: 17.0)
+    @available(watchOS, obsoleted: 10.0)
+    @available(tvOS, obsoleted: 17.0)
+    static func runUnsafely<T>(_ body: @MainActor () throws -> T) rethrows -> T {
+        if #available(macOS 14.0, iOS 17.0, watchOS 10.0, tvOS 17.0, *) {
+            return try MainActor.assumeIsolated(body)
+        }
+        
+        dispatchPrecondition(condition: .onQueue(.main))
+        return try withoutActuallyEscaping(body) { fn in
+            try unsafeBitCast(fn, to: (() throws -> T).self)()
+        }
+    }
+}
+
+private func decodeBase64URL(_ s: String) -> Data? {
+    var str = s.replacingOccurrences(of: "-", with: "+").replacingOccurrences(of: "_", with: "/")
+    if str.count % 4 != 0 {
+        str.append(String(repeating: "=", count: 4 - str.count % 4))
+    }
+    return Data(base64Encoded: str)
+}

Packages/Pachyderm/Sources/Pachyderm/Model/PushNotification.swift

@@ -0,0 +1,46 @@
+//
+//  PushNotification.swift
+//  Pachyderm
+//
+//  Created by Shadowfacts on 4/9/24.
+//
+
+import Foundation
+import WebURL
+
+public struct PushNotification: Decodable {
+    public let accessToken: String
+    public let preferredLocale: String
+    public let notificationID: String
+    public let notificationType: Notification.Kind
+    public let icon: WebURL
+    public let title: String
+    public let body: String
+    
+    public init(from decoder: any Decoder) throws {
+        let container = try decoder.container(keyedBy: CodingKeys.self)
+        self.accessToken = try container.decode(String.self, forKey: .accessToken)
+        self.preferredLocale = try container.decode(String.self, forKey: .preferredLocale)
+        // this should be a string, but mastodon encodes it as a json number
+        if let s = try? container.decode(String.self, forKey: .notificationID) {
+            self.notificationID = s
+        } else {
+            let i = try container.decode(Int.self, forKey: .notificationID)
+            self.notificationID = i.description
+        }
+        self.notificationType = try container.decode(Notification.Kind.self, forKey: .notificationType)
+        self.icon = try container.decode(WebURL.self, forKey: .icon)
+        self.title = try container.decode(String.self, forKey: .title)
+        self.body = try container.decode(String.self, forKey: .body)
+    }
+    
+    private enum CodingKeys: String, CodingKey {
+        case accessToken = "access_token"
+        case preferredLocale = "preferred_locale"
+        case notificationID = "notification_id"
+        case notificationType = "notification_type"
+        case icon
+        case title
+        case body
+    }
+}

ShareExtension/ShareExtension.entitlements

@@ -6,7 +6,7 @@
 	<true/>
 	<key>com.apple.security.application-groups</key>
 	<array>
-		<string>group.space.vaccor.Tusker</string>
+		<string>group.$(BUNDLE_ID_PREFIX).Tusker</string>
 	</array>
 	<key>com.apple.security.network.client</key>
 	<true/>

Tusker.xcodeproj/project.pbxproj

@@ -95,6 +95,12 @@
 		D630C3C82BC43AFD00208903 /* PushNotifications in Frameworks */ = {isa = PBXBuildFile; productRef = D630C3C72BC43AFD00208903 /* PushNotifications */; };
 		D630C3CA2BC59FF500208903 /* MastodonController+Push.swift in Sources */ = {isa = PBXBuildFile; fileRef = D630C3C92BC59FF500208903 /* MastodonController+Push.swift */; };
 		D630C3CC2BC5FD4600208903 /* GetAuthorizationTokenService.swift in Sources */ = {isa = PBXBuildFile; fileRef = D630C3CB2BC5FD4600208903 /* GetAuthorizationTokenService.swift */; };
+		D630C3D42BC61B6100208903 /* NotificationService.swift in Sources */ = {isa = PBXBuildFile; fileRef = D630C3D32BC61B6100208903 /* NotificationService.swift */; };
+		D630C3D82BC61B6100208903 /* NotificationExtension.appex in Embed Foundation Extensions */ = {isa = PBXBuildFile; fileRef = D630C3D12BC61B6000208903 /* NotificationExtension.appex */; platformFilters = (ios, maccatalyst, ); settings = {ATTRIBUTES = (RemoveHeadersOnCopy, ); }; };
+		D630C3DF2BC61C4900208903 /* PushNotifications in Frameworks */ = {isa = PBXBuildFile; productRef = D630C3DE2BC61C4900208903 /* PushNotifications */; };
+		D630C3E12BC61C6700208903 /* UserAccounts in Frameworks */ = {isa = PBXBuildFile; productRef = D630C3E02BC61C6700208903 /* UserAccounts */; };
+		D630C3E52BC6313400208903 /* Pachyderm in Frameworks */ = {isa = PBXBuildFile; productRef = D630C3E42BC6313400208903 /* Pachyderm */; };
+		D630C3E72BC6313F00208903 /* WebURLFoundationExtras in Frameworks */ = {isa = PBXBuildFile; productRef = D630C3E62BC6313F00208903 /* WebURLFoundationExtras */; };
 		D6311C5025B3765B00B27539 /* ImageDataCache.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6311C4F25B3765B00B27539 /* ImageDataCache.swift */; };
 		D6333B372137838300CE884A /* AttributedString+Helpers.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6333B362137838300CE884A /* AttributedString+Helpers.swift */; };
 		D6333B792139AEFD00CE884A /* Date+TimeAgo.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6333B782139AEFD00CE884A /* Date+TimeAgo.swift */; };
@@ -359,6 +365,13 @@
 /* End PBXBuildFile section */
 
 /* Begin PBXContainerItemProxy section */
+		D630C3D62BC61B6100208903 /* PBXContainerItemProxy */ = {
+			isa = PBXContainerItemProxy;
+			containerPortal = D6D4DDC4212518A000E1C4BB /* Project object */;
+			proxyType = 1;
+			remoteGlobalIDString = D630C3D02BC61B6000208903;
+			remoteInfo = NotificationExtension;
+		};
 		D6A4531B29EF64BA00032932 /* PBXContainerItemProxy */ = {
 			isa = PBXContainerItemProxy;
 			containerPortal = D6D4DDC4212518A000E1C4BB /* Project object */;
@@ -397,6 +410,7 @@
 			dstSubfolderSpec = 13;
 			files = (
 				D6A4531D29EF64BA00032932 /* ShareExtension.appex in Embed Foundation Extensions */,
+				D630C3D82BC61B6100208903 /* NotificationExtension.appex in Embed Foundation Extensions */,
 				D6E343B4265AAD6B00C4AA01 /* OpenInTusker.appex in Embed Foundation Extensions */,
 			);
 			name = "Embed Foundation Extensions";
@@ -501,6 +515,10 @@
 		D62FF04723D7CDD700909D6E /* AttributedStringHelperTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AttributedStringHelperTests.swift; sourceTree = "<group>"; };
 		D630C3C92BC59FF500208903 /* MastodonController+Push.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "MastodonController+Push.swift"; sourceTree = "<group>"; };
 		D630C3CB2BC5FD4600208903 /* GetAuthorizationTokenService.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = GetAuthorizationTokenService.swift; sourceTree = "<group>"; };
+		D630C3D12BC61B6000208903 /* NotificationExtension.appex */ = {isa = PBXFileReference; explicitFileType = "wrapper.app-extension"; includeInIndex = 0; path = NotificationExtension.appex; sourceTree = BUILT_PRODUCTS_DIR; };
+		D630C3D32BC61B6100208903 /* NotificationService.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = NotificationService.swift; sourceTree = "<group>"; };
+		D630C3D52BC61B6100208903 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
+		D630C3D92BC61B6100208903 /* NotificationExtension.entitlements */ = {isa = PBXFileReference; lastKnownFileType = text.plist.entitlements; path = NotificationExtension.entitlements; sourceTree = "<group>"; };
 		D6311C4F25B3765B00B27539 /* ImageDataCache.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ImageDataCache.swift; sourceTree = "<group>"; };
 		D6333B362137838300CE884A /* AttributedString+Helpers.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "AttributedString+Helpers.swift"; sourceTree = "<group>"; };
 		D6333B782139AEFD00CE884A /* Date+TimeAgo.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "Date+TimeAgo.swift"; sourceTree = "<group>"; };
@@ -778,6 +796,17 @@
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
+		D630C3CE2BC61B6000208903 /* Frameworks */ = {
+			isa = PBXFrameworksBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				D630C3E52BC6313400208903 /* Pachyderm in Frameworks */,
+				D630C3E72BC6313F00208903 /* WebURLFoundationExtras in Frameworks */,
+				D630C3DF2BC61C4900208903 /* PushNotifications in Frameworks */,
+				D630C3E12BC61C6700208903 /* UserAccounts in Frameworks */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
 		D6A4531029EF64BA00032932 /* Frameworks */ = {
 			isa = PBXFrameworksBuildPhase;
 			buildActionMask = 2147483647;
@@ -970,6 +999,16 @@
 			path = Shortcuts;
 			sourceTree = "<group>";
 		};
+		D630C3D22BC61B6100208903 /* NotificationExtension */ = {
+			isa = PBXGroup;
+			children = (
+				D630C3D92BC61B6100208903 /* NotificationExtension.entitlements */,
+				D630C3D32BC61B6100208903 /* NotificationService.swift */,
+				D630C3D52BC61B6100208903 /* Info.plist */,
+			);
+			path = NotificationExtension;
+			sourceTree = "<group>";
+		};
 		D6370B9924421FE00092A7FF /* CoreData */ = {
 			isa = PBXGroup;
 			children = (
@@ -1489,6 +1528,7 @@
 				D6D4DDEE212518A200E1C4BB /* TuskerUITests */,
 				D6E343A9265AAD6B00C4AA01 /* OpenInTusker */,
 				D6A4531429EF64BA00032932 /* ShareExtension */,
+				D630C3D22BC61B6100208903 /* NotificationExtension */,
 				D6D4DDCD212518A000E1C4BB /* Products */,
 				D65A37F221472F300087646E /* Frameworks */,
 			);
@@ -1502,6 +1542,7 @@
 				D6D4DDEB212518A200E1C4BB /* TuskerUITests.xctest */,
 				D6E343A8265AAD6B00C4AA01 /* OpenInTusker.appex */,
 				D6A4531329EF64BA00032932 /* ShareExtension.appex */,
+				D630C3D12BC61B6000208903 /* NotificationExtension.appex */,
 			);
 			name = Products;
 			sourceTree = "<group>";
@@ -1678,6 +1719,29 @@
 /* End PBXGroup section */
 
 /* Begin PBXNativeTarget section */
+		D630C3D02BC61B6000208903 /* NotificationExtension */ = {
+			isa = PBXNativeTarget;
+			buildConfigurationList = D630C3DA2BC61B6100208903 /* Build configuration list for PBXNativeTarget "NotificationExtension" */;
+			buildPhases = (
+				D630C3CD2BC61B6000208903 /* Sources */,
+				D630C3CE2BC61B6000208903 /* Frameworks */,
+				D630C3CF2BC61B6000208903 /* Resources */,
+			);
+			buildRules = (
+			);
+			dependencies = (
+			);
+			name = NotificationExtension;
+			packageProductDependencies = (
+				D630C3DE2BC61C4900208903 /* PushNotifications */,
+				D630C3E02BC61C6700208903 /* UserAccounts */,
+				D630C3E42BC6313400208903 /* Pachyderm */,
+				D630C3E62BC6313F00208903 /* WebURLFoundationExtras */,
+			);
+			productName = NotificationExtension;
+			productReference = D630C3D12BC61B6000208903 /* NotificationExtension.appex */;
+			productType = "com.apple.product-type.app-extension";
+		};
 		D6A4531229EF64BA00032932 /* ShareExtension */ = {
 			isa = PBXNativeTarget;
 			buildConfigurationList = D6A4532229EF64BA00032932 /* Build configuration list for PBXNativeTarget "ShareExtension" */;
@@ -1719,6 +1783,7 @@
 			dependencies = (
 				D6E343B3265AAD6B00C4AA01 /* PBXTargetDependency */,
 				D6A4531C29EF64BA00032932 /* PBXTargetDependency */,
+				D630C3D72BC61B6100208903 /* PBXTargetDependency */,
 			);
 			name = Tusker;
 			packageProductDependencies = (
@@ -1804,10 +1869,13 @@
 			isa = PBXProject;
 			attributes = {
 				BuildIndependentTargetsInParallel = YES;
-				LastSwiftUpdateCheck = 1430;
+				LastSwiftUpdateCheck = 1530;
 				LastUpgradeCheck = 1500;
 				ORGANIZATIONNAME = Shadowfacts;
 				TargetAttributes = {
+					D630C3D02BC61B6000208903 = {
+						CreatedOnToolsVersion = 15.3;
+					};
 					D6A4531229EF64BA00032932 = {
 						CreatedOnToolsVersion = 14.3;
 					};
@@ -1860,11 +1928,19 @@
 				D6D4DDEA212518A200E1C4BB /* TuskerUITests */,
 				D6E343A7265AAD6B00C4AA01 /* OpenInTusker */,
 				D6A4531229EF64BA00032932 /* ShareExtension */,
+				D630C3D02BC61B6000208903 /* NotificationExtension */,
 			);
 		};
 /* End PBXProject section */
 
 /* Begin PBXResourcesBuildPhase section */
+		D630C3CF2BC61B6000208903 /* Resources */ = {
+			isa = PBXResourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
 		D6A4531129EF64BA00032932 /* Resources */ = {
 			isa = PBXResourcesBuildPhase;
 			buildActionMask = 2147483647;
@@ -1965,6 +2041,14 @@
 /* End PBXShellScriptBuildPhase section */
 
 /* Begin PBXSourcesBuildPhase section */
+		D630C3CD2BC61B6000208903 /* Sources */ = {
+			isa = PBXSourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				D630C3D42BC61B6100208903 /* NotificationService.swift in Sources */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
 		D6A4530F29EF64BA00032932 /* Sources */ = {
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
@@ -2312,6 +2396,11 @@
 /* End PBXSourcesBuildPhase section */
 
 /* Begin PBXTargetDependency section */
+		D630C3D72BC61B6100208903 /* PBXTargetDependency */ = {
+			isa = PBXTargetDependency;
+			target = D630C3D02BC61B6000208903 /* NotificationExtension */;
+			targetProxy = D630C3D62BC61B6100208903 /* PBXContainerItemProxy */;
+		};
 		D6A4531C29EF64BA00032932 /* PBXTargetDependency */ = {
 			isa = PBXTargetDependency;
 			target = D6A4531229EF64BA00032932 /* ShareExtension */;
@@ -2370,6 +2459,100 @@
 /* End PBXVariantGroup section */
 
 /* Begin XCBuildConfiguration section */
+		D630C3DB2BC61B6100208903 /* Debug */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_GENERATE_SWIFT_ASSET_SYMBOL_EXTENSIONS = YES;
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++20";
+				CODE_SIGN_ENTITLEMENTS = NotificationExtension/NotificationExtension.entitlements;
+				CODE_SIGN_IDENTITY = "iPhone Developer";
+				CODE_SIGN_STYLE = Automatic;
+				ENABLE_USER_SCRIPT_SANDBOXING = YES;
+				GCC_C_LANGUAGE_STANDARD = gnu17;
+				GENERATE_INFOPLIST_FILE = YES;
+				INFOPLIST_FILE = NotificationExtension/Info.plist;
+				INFOPLIST_KEY_CFBundleDisplayName = NotificationExtension;
+				INFOPLIST_KEY_NSHumanReadableCopyright = "Copyright © 2024 Shadowfacts. All rights reserved.";
+				IPHONEOS_DEPLOYMENT_TARGET = 15.0;
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+					"@executable_path/../../Frameworks",
+				);
+				LOCALIZATION_PREFERS_STRING_CATALOGS = YES;
+				PRODUCT_BUNDLE_IDENTIFIER = space.vaccor.Tusker.NotificationExtension;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SKIP_INSTALL = YES;
+				SUPPORTS_MACCATALYST = YES;
+				SWIFT_ACTIVE_COMPILATION_CONDITIONS = "DEBUG $(inherited)";
+				SWIFT_EMIT_LOC_STRINGS = YES;
+				SWIFT_VERSION = 5.0;
+				TARGETED_DEVICE_FAMILY = "1,2";
+			};
+			name = Debug;
+		};
+		D630C3DC2BC61B6100208903 /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_GENERATE_SWIFT_ASSET_SYMBOL_EXTENSIONS = YES;
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++20";
+				CODE_SIGN_ENTITLEMENTS = NotificationExtension/NotificationExtension.entitlements;
+				CODE_SIGN_IDENTITY = "iPhone Developer";
+				CODE_SIGN_STYLE = Automatic;
+				ENABLE_USER_SCRIPT_SANDBOXING = YES;
+				GCC_C_LANGUAGE_STANDARD = gnu17;
+				GENERATE_INFOPLIST_FILE = YES;
+				INFOPLIST_FILE = NotificationExtension/Info.plist;
+				INFOPLIST_KEY_CFBundleDisplayName = NotificationExtension;
+				INFOPLIST_KEY_NSHumanReadableCopyright = "Copyright © 2024 Shadowfacts. All rights reserved.";
+				IPHONEOS_DEPLOYMENT_TARGET = 15.0;
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+					"@executable_path/../../Frameworks",
+				);
+				LOCALIZATION_PREFERS_STRING_CATALOGS = YES;
+				PRODUCT_BUNDLE_IDENTIFIER = space.vaccor.Tusker.NotificationExtension;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SKIP_INSTALL = YES;
+				SUPPORTS_MACCATALYST = YES;
+				SWIFT_EMIT_LOC_STRINGS = YES;
+				SWIFT_VERSION = 5.0;
+				TARGETED_DEVICE_FAMILY = "1,2";
+			};
+			name = Release;
+		};
+		D630C3DD2BC61B6100208903 /* Dist */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_GENERATE_SWIFT_ASSET_SYMBOL_EXTENSIONS = YES;
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++20";
+				CODE_SIGN_ENTITLEMENTS = NotificationExtension/NotificationExtension.entitlements;
+				CODE_SIGN_IDENTITY = "iPhone Developer";
+				CODE_SIGN_STYLE = Automatic;
+				ENABLE_USER_SCRIPT_SANDBOXING = YES;
+				GCC_C_LANGUAGE_STANDARD = gnu17;
+				GENERATE_INFOPLIST_FILE = YES;
+				INFOPLIST_FILE = NotificationExtension/Info.plist;
+				INFOPLIST_KEY_CFBundleDisplayName = NotificationExtension;
+				INFOPLIST_KEY_NSHumanReadableCopyright = "Copyright © 2024 Shadowfacts. All rights reserved.";
+				IPHONEOS_DEPLOYMENT_TARGET = 15.0;
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+					"@executable_path/../../Frameworks",
+				);
+				LOCALIZATION_PREFERS_STRING_CATALOGS = YES;
+				PRODUCT_BUNDLE_IDENTIFIER = space.vaccor.Tusker.NotificationExtension;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SKIP_INSTALL = YES;
+				SUPPORTS_MACCATALYST = YES;
+				SWIFT_EMIT_LOC_STRINGS = YES;
+				SWIFT_VERSION = 5.0;
+				TARGETED_DEVICE_FAMILY = "1,2";
+			};
+			name = Dist;
+		};
 		D63CC705290ECE77000E19DE /* Dist */ = {
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = D63CC703290EC472000E19DE /* Dist.xcconfig */;
@@ -2934,6 +3117,16 @@
 /* End XCBuildConfiguration section */
 
 /* Begin XCConfigurationList section */
+		D630C3DA2BC61B6100208903 /* Build configuration list for PBXNativeTarget "NotificationExtension" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				D630C3DB2BC61B6100208903 /* Debug */,
+				D630C3DC2BC61B6100208903 /* Release */,
+				D630C3DD2BC61B6100208903 /* Dist */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
 		D6A4532229EF64BA00032932 /* Build configuration list for PBXNativeTarget "ShareExtension" */ = {
 			isa = XCConfigurationList;
 			buildConfigurations = (
@@ -3045,6 +3238,23 @@
 			isa = XCSwiftPackageProductDependency;
 			productName = PushNotifications;
 		};
+		D630C3DE2BC61C4900208903 /* PushNotifications */ = {
+			isa = XCSwiftPackageProductDependency;
+			productName = PushNotifications;
+		};
+		D630C3E02BC61C6700208903 /* UserAccounts */ = {
+			isa = XCSwiftPackageProductDependency;
+			productName = UserAccounts;
+		};
+		D630C3E42BC6313400208903 /* Pachyderm */ = {
+			isa = XCSwiftPackageProductDependency;
+			productName = Pachyderm;
+		};
+		D630C3E62BC6313F00208903 /* WebURLFoundationExtras */ = {
+			isa = XCSwiftPackageProductDependency;
+			package = D6676CA127A8D0020052936B /* XCRemoteSwiftPackageReference "swift-url" */;
+			productName = WebURLFoundationExtras;
+		};
 		D635237029B78A7D009ED5E7 /* TuskerComponents */ = {
 			isa = XCSwiftPackageProductDependency;
 			productName = TuskerComponents;

Tusker/Extensions/MainActor+Unsafe.swift

@@ -47,6 +47,10 @@ public extension MainActor {
     ///
     /// It will crash if run on any non-main thread.
     @_unavailableFromAsync
+    @available(macOS, obsoleted: 14.0)
+    @available(iOS, obsoleted: 17.0)
+    @available(watchOS, obsoleted: 10.0)
+    @available(tvOS, obsoleted: 17.0)
     static func runUnsafely<T>(_ body: @MainActor () throws -> T) rethrows -> T {
         if #available(macOS 14.0, iOS 17.0, watchOS 10.0, tvOS 17.0, *) {
             return try MainActor.assumeIsolated(body)