Import and refactor stuff from old UIKit project

.gitignore

@@ -1 +1,2 @@
 xcuserdata/
+*.xcodeproj/xcuserdata

.swiftlint.yml

@@ -0,0 +1,2 @@
+disabled_rules:
+  identifier_name

Development Assets/FakeKeychain.swift

@@ -0,0 +1,19 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import Foundation
+
+typealias FakeKeychain = [String: Data]
+
+extension FakeKeychain: KeychainType {
+    mutating func set(data: Data, forKey key: String) throws {
+        self[key] = data
+    }
+
+    mutating func deleteData(key: String) throws {
+        self[key] = nil
+    }
+
+    func getData(key: String) throws -> Data? {
+        self[key]
+    }
+}

Development Assets/HTTPStubs.swift

@@ -0,0 +1,16 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import Foundation
+
+struct HTTPStubs {
+    static func stub(
+        request: URLRequest,
+        target: HTTPTarget? = nil,
+        userInfo: [String: Any] = [:]) -> HTTPStub? {
+        guard let url = request.url else {
+            return nil
+        }
+
+        return (target as? Stubbing)?.stub(url: url)
+    }
+}

Development Assets/Mastodon API Stubs/AccessTokenEndpoint+Stubbing.swift

@@ -0,0 +1,19 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import Foundation
+
+extension AccessTokenEndpoint: Stubbing {
+    func dataString(url: URL) -> String? {
+        switch self {
+        case let .oauthToken(_, _, _, _, scopes, _):
+            return """
+            {
+              "access_token": "ACCESS_TOKEN_STUB_VALUE",
+              "token_type": "Bearer",
+              "scope": "\(scopes)",
+              "created_at": "\(Int(Date().timeIntervalSince1970))"
+            }
+            """
+        }
+    }
+}

Development Assets/Mastodon API Stubs/AppAuthorizationEndpoint+Stubbing.swift

@@ -0,0 +1,22 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import Foundation
+
+extension AppAuthorizationEndpoint: Stubbing {
+    func dataString(url: URL) -> String? {
+        switch self {
+        case let .apps(clientName, redirectURI, _, _):
+            return """
+            {
+              "id": "\(Int.random(in: 100000...999999))",
+              "name": "\(clientName)",
+              "website": null,
+              "redirect_uri": "\(redirectURI)",
+              "client_id": "AUTHORIZATION_CLIENT_ID_STUB_VALUE",
+              "client_secret": "AUTHORIZATION_CLIENT_SECRET_STUB_VALUE",
+              "vapid_key": "AUTHORIZATION_VAPID_KEY_STUB_VALUE"
+            }
+            """
+        }
+    }
+}

Development Assets/Mastodon API Stubs/MastodonTarget+Stubbing.swift

@@ -0,0 +1,21 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import Foundation
+
+extension MastodonTarget: Stubbing {
+    func stub(url: URL) -> HTTPStub? {
+        (endpoint as? Stubbing)?.stub(url: url)
+    }
+
+    func data(url: URL) -> Data? {
+        (endpoint as? Stubbing)?.data(url: url)
+    }
+
+    func dataString(url: URL) -> String? {
+        (endpoint as? Stubbing)?.dataString(url: url)
+    }
+
+    func statusCode(url: URL) -> Int? {
+        (endpoint as? Stubbing)?.statusCode(url: url)
+    }
+}

Development Assets/Stubbing.swift

@@ -0,0 +1,34 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import Foundation
+
+typealias HTTPStub = Result<(URLResponse, Data), Error>
+
+protocol Stubbing {
+    func stub(url: URL) -> HTTPStub?
+    func data(url: URL) -> Data?
+    func dataString(url: URL) -> String?
+    func statusCode(url: URL) -> Int?
+}
+
+extension Stubbing {
+    func stub(url: URL) -> HTTPStub? {
+        if let data = data(url: url),
+              let statusCode = statusCode(url: url),
+              let response = HTTPURLResponse(
+                url: url,
+                statusCode: statusCode,
+                httpVersion: nil,
+                headerFields: nil) {
+            return .success((response, data))
+        }
+
+        return nil
+    }
+
+    func data(url: URL) -> Data? {
+        dataString(url: url)?.data(using: .utf8)
+    }
+
+    func statusCode(url: URL) -> Int? { 200 }
+}

Development Assets/StubbingURLProtocol.swift

@@ -0,0 +1,42 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import Foundation
+
+class StubbingURLProtocol: URLProtocol {
+    private static var targetsForURLs = [URL: HTTPTarget]()
+
+    class func setTarget(_ target: HTTPTarget, forURL url: URL) {
+        targetsForURLs[url] = target
+    }
+
+    override class func canInit(with task: URLSessionTask) -> Bool {
+        true
+    }
+
+    override class func canInit(with request: URLRequest) -> Bool {
+        true
+    }
+
+    override class func canonicalRequest(for request: URLRequest) -> URLRequest {
+        request
+    }
+
+    override func startLoading() {
+        guard
+            let url = request.url,
+            let stub = HTTPStubs.stub(request: request, target: Self.targetsForURLs[url]) else {
+            preconditionFailure("Stub for request not found")
+        }
+
+        switch stub {
+        case let .success((response, data)):
+            client?.urlProtocol(self, didReceive: response, cacheStoragePolicy: .allowed)
+            client?.urlProtocol(self, didLoad: data)
+            client?.urlProtocolDidFinishLoading(self)
+        case let .failure(error):
+            client?.urlProtocol(self, didFailWithError: error)
+        }
+    }
+
+    override func stopLoading() {}
+}

Development Assets/StubbingWebAuthenticationSession.swift

@@ -0,0 +1,71 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import Foundation
+import AuthenticationServices
+
+class StubbingWebAuthenticationSession: WebAuthenticationSessionType {
+    let completionHandler: ASWebAuthenticationSession.CompletionHandler
+    let url: URL
+    let callbackURLScheme: String?
+    var presentationContextProvider: ASWebAuthenticationPresentationContextProviding?
+
+    required init(
+        url URL: URL,
+        callbackURLScheme: String?,
+        completionHandler: @escaping ASWebAuthenticationSession.CompletionHandler) {
+        self.url = URL
+        self.callbackURLScheme = callbackURLScheme
+        self.completionHandler = completionHandler
+    }
+
+    func start() -> Bool {
+        completionHandler(completionHandlerURL, completionHandlerError)
+
+        return true
+    }
+
+    var completionHandlerURL: URL? {
+        nil
+    }
+
+    var completionHandlerError: Error? {
+        nil
+    }
+}
+
+// swiftlint:disable type_name
+class SuccessfulStubbingWebAuthenticationSession: StubbingWebAuthenticationSession {
+// swiftlint:enable type_name
+    private let redirectURL: URL
+
+    required init(
+        url URL: URL,
+        callbackURLScheme: String?,
+        completionHandler: @escaping ASWebAuthenticationSession.CompletionHandler) {
+        redirectURL = Foundation.URL(
+            string: URLComponents(url: URL, resolvingAgainstBaseURL: true)!
+                .queryItems!.first(where: { $0.name == "redirect_uri" })!.value!)!
+        super.init(
+            url: URL,
+            callbackURLScheme: callbackURLScheme,
+            completionHandler: completionHandler)
+    }
+
+    override var completionHandlerURL: URL? {
+        var components = URLComponents(url: redirectURL, resolvingAgainstBaseURL: true)!
+        var queryItems = components.queryItems ?? []
+
+        queryItems.append(URLQueryItem(name: "code", value: UUID().uuidString))
+        components.queryItems = queryItems
+
+        return components.url
+    }
+}
+
+// swiftlint:disable type_name
+class CanceledLoginStubbingWebAuthenticationSession: StubbingWebAuthenticationSession {
+// swiftlint:enable type_name
+    override var completionHandlerError: Error? {
+        ASWebAuthenticationSessionError(.canceledLogin)
+    }
+}

Development Assets/URLSessionConfiguration+Extensions.swift

@@ -0,0 +1,13 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import Foundation
+
+extension URLSessionConfiguration {
+    static var stubbing: URLSessionConfiguration {
+        let configuration = Self.default
+
+        configuration.protocolClasses = [StubbingURLProtocol.self]
+
+        return configuration
+    }
+}

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@@ -3,52 +3,185 @@
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+				D0DC177324D0B58800A75C65 /* Keychain.swift */,
+				D0ED1BE224CFA84400B4899C /* MastodonError.swift */,
+				D0666A7124C6E0D300F3F04B /* Secrets.swift */,
 			);
-			path = "Tests macOS";
+			path = Model;
+			sourceTree = "<group>";
+		};
+		D0666A7924C7745A00F3F04B /* Frameworks */ = {
+			isa = PBXGroup;
+			children = (
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+			isa = PBXGroup;
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+			);
+			path = Localizations;
+			sourceTree = "<group>";
+		};
+		D0DB6EF024C5224F00D965FE /* Views */ = {
+			isa = PBXGroup;
+			children = (
+				D0DB6EF324C5228A00D965FE /* AddIdentityView.swift */,
+				D0BEC93A24C96FD500E864C4 /* ContentView.swift */,
+				D0BEC94924CA231200E864C4 /* TimelineView.swift */,
+			);
+			path = Views;
+			sourceTree = "<group>";
+		};
+		D0DB6EFA24C5730600D965FE /* Networking */ = {
+			isa = PBXGroup;
+			children = (
+				D0ED1BC624CF6CE300B4899C /* Mastodon API */,
+				D0ED1BC324CED54D00B4899C /* HTTPTarget.swift */,
+				D0ED1BC024CED48800B4899C /* HTTPClient.swift */,
+				D0666A5624C6C63400F3F04B /* MastodonDecoder.swift */,
+				D0666A5924C6C64100F3F04B /* MastodonEncoder.swift */,
+				D0ED1BB624CE47F400B4899C /* WebAuthenticationSession.swift */,
+			);
+			path = Networking;
+			sourceTree = "<group>";
+		};
+		D0DB6EFB24C658E400D965FE /* View Models */ = {
+			isa = PBXGroup;
+			children = (
+				D0DB6F0824C65AC000D965FE /* AddIdentityViewModel.swift */,
+				D0BEC93724C9632800E864C4 /* SceneViewModel.swift */,
+				D0BEC94624CA22C400E864C4 /* TimelineViewModel.swift */,
+			);
+			path = "View Models";
+			sourceTree = "<group>";
+		};
+		D0DB6F1624C665B400D965FE /* Extensions */ = {
+			isa = PBXGroup;
+			children = (
+				D0B23F0C24D210E90066F411 /* NSError+Extensions.swift */,
+				D0C963FD24CC3812003BD330 /* Publisher+Extensions.swift */,
+				D081A40424D0F1A8001B016E /* String+Extensions.swift */,
+				D065F53A24D3B33A00741304 /* View+Extensions.swift */,
+			);
+			path = Extensions;
+			sourceTree = "<group>";
+		};
+		D0DC174824CFF13700A75C65 /* Mastodon API Stubs */ = {
+			isa = PBXGroup;
+			children = (
+				D0DC175424D00F0A00A75C65 /* AccessTokenEndpoint+Stubbing.swift */,
+				D0DC174924CFF15F00A75C65 /* AppAuthorizationEndpoint+Stubbing.swift */,
+				D0DC175124D008E300A75C65 /* MastodonTarget+Stubbing.swift */,
+			);
+			path = "Mastodon API Stubs";
+			sourceTree = "<group>";
+		};
+		D0ED1B6C24CE0EED00B4899C /* View Models */ = {
+			isa = PBXGroup;
+			children = (
+				D0ED1B6D24CE100C00B4899C /* AddIdentityViewModelTests.swift */,
+			);
+			path = "View Models";
+			sourceTree = "<group>";
+		};
+		D0ED1BB224CE3A1600B4899C /* Development Assets */ = {
+			isa = PBXGroup;
+			children = (
+				D0DC177624D0CF2600A75C65 /* FakeKeychain.swift */,
+				D0DC175724D0130800A75C65 /* HTTPStubs.swift */,
+				D0DC174824CFF13700A75C65 /* Mastodon API Stubs */,
+				D0DC174C24CFF1F100A75C65 /* Stubbing.swift */,
+				D0DC174524CFEC2000A75C65 /* StubbingURLProtocol.swift */,
+				D074577624D29006004758DB /* StubbingWebAuthenticationSession.swift */,
+				D074577924D29366004758DB /* URLSessionConfiguration+Extensions.swift */,
+			);
+			path = "Development Assets";
+			sourceTree = "<group>";
+		};
+		D0ED1BC624CF6CE300B4899C /* Mastodon API */ = {
+			isa = PBXGroup;
+			children = (
+				D0ED1BDC24CF982600B4899C /* AccessTokenEndpoint.swift */,
+				D0ED1BDF24CF98FB00B4899C /* AccountEndpoint.swift */,
+				D0ED1BD924CF963E00B4899C /* AppAuthorizationEndpoint.swift */,
+				D065F53D24D3D20300741304 /* InstanceEndpoint.swift */,
+				D0DC175A24D0154F00A75C65 /* MastodonAPI.swift */,
+				D0ED1BCA24CF744200B4899C /* MastodonClient.swift */,
+				D0ED1BCD24CF768200B4899C /* MastodonEndpoint.swift */,
+				D0ED1BD024CF779B00B4899C /* MastodonTarget.swift */,
+			);
+			path = "Mastodon API";
 			sourceTree = "<group>";
 		};
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@@ -161,12 +416,17 @@
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 				D047FA8924C3E21200AF17C5 /* Frameworks */,
 				D047FA8A24C3E21200AF17C5 /* Resources */,
+				D0666A2E24C67E6700F3F04B /* ShellScript */,
 			);
 			buildRules = (
 			);
 			dependencies = (
 			);
 			name = "Metatext (iOS)";
+			packageProductDependencies = (
+				D0666A4824C6C1A300F3F04B /* GRDB */,
+				D0DC175E24D016EA00A75C65 /* Alamofire */,
+			);
 			productName = "Metatext (iOS)";
 			productReference = D047FA8C24C3E21200AF17C5 /* Metatext.app */;
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@@ -178,51 +438,41 @@
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 				D047FA9124C3E21200AF17C5 /* Frameworks */,
 				D047FA9224C3E21200AF17C5 /* Resources */,
+				D0666A2F24C67F1400F3F04B /* ShellScript */,
 			);
 			buildRules = (
 			);
 			dependencies = (
 			);
 			name = "Metatext (macOS)";
+			packageProductDependencies = (
+				D0666A7C24C7745A00F3F04B /* GRDB */,
+				D0DC176024D0171800A75C65 /* Alamofire */,
+			);
 			productName = "Metatext (macOS)";
 			productReference = D047FA9424C3E21200AF17C5 /* Metatext.app */;
 			productType = "com.apple.product-type.application";
 		};
-		D047FA9B24C3E21200AF17C5 /* Tests iOS */ = {
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-			buildConfigurationList = D047FABC24C3E21200AF17C5 /* Build configuration list for PBXNativeTarget "Tests iOS" */;
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 			buildPhases = (
-				D047FA9824C3E21200AF17C5 /* Sources */,
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-				D047FA9924C3E21200AF17C5 /* Frameworks */,
+				D0666A1E24C677B400F3F04B /* Frameworks */,
-				D047FA9A24C3E21200AF17C5 /* Resources */,
+				D0666A1F24C677B400F3F04B /* Resources */,
 			);
 			buildRules = (
 			);
 			dependencies = (
-				D047FA9E24C3E21200AF17C5 /* PBXTargetDependency */,
+				D0666A2724C677B400F3F04B /* PBXTargetDependency */,
 			);
-			name = "Tests iOS";
+			name = Tests;
-			productName = "Tests iOS";
+			packageProductDependencies = (
-			productReference = D047FA9C24C3E21200AF17C5 /* Tests iOS.xctest */;
+				D065F53824D37E5100741304 /* CombineExpectations */,
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-		};
-		D047FAA624C3E21200AF17C5 /* Tests macOS */ = {
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-				D047FAA424C3E21200AF17C5 /* Frameworks */,
-				D047FAA524C3E21200AF17C5 /* Resources */,
 			);
-			buildRules = (
+			productName = "Unit Tests";
-			);
+			productReference = D0666A2124C677B400F3F04B /* Tests.xctest */;
-			dependencies = (
+			productType = "com.apple.product-type.bundle.unit-test";
-				D047FAA924C3E21200AF17C5 /* PBXTargetDependency */,
-			);
-			name = "Tests macOS";
-			productName = "Tests macOS";
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@@ -240,14 +490,11 @@
 					D047FA9324C3E21200AF17C5 = {
 						CreatedOnToolsVersion = 12.0;
 					};
-					D047FA9B24C3E21200AF17C5 = {
+					D0666A2024C677B400F3F04B = {
 						CreatedOnToolsVersion = 12.0;
+						LastSwiftMigration = 1200;
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 					};
-					D047FAA624C3E21200AF17C5 = {
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@@ -259,14 +506,18 @@
 				Base,
 			);
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+			packageReferences = (
+				D0666A4724C6C1A300F3F04B /* XCRemoteSwiftPackageReference "GRDB" */,
+				D0DC175D24D016EA00A75C65 /* XCRemoteSwiftPackageReference "Alamofire" */,
+				D065F53724D37E5100741304 /* XCRemoteSwiftPackageReference "CombineExpectations" */,
+			);
 			productRefGroup = D047FA8D24C3E21200AF17C5 /* Products */;
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 			projectRoot = "";
 			targets = (
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 				D047FA9324C3E21200AF17C5 /* Metatext (macOS) */,
-				D047FA9B24C3E21200AF17C5 /* Tests iOS */,
+				D0666A2024C677B400F3F04B /* Tests */,
-				D047FAA624C3E21200AF17C5 /* Tests macOS */,
 			);
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 /* End PBXProject section */
@@ -277,6 +528,7 @@
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 			files = (
 				D047FAB224C3E21200AF17C5 /* Assets.xcassets in Resources */,
+				D06B491F24D3F7FE00642749 /* Localizable.strings in Resources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
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@@ -285,17 +537,11 @@
 			buildActionMask = 2147483647;
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 				D047FAB324C3E21200AF17C5 /* Assets.xcassets in Resources */,
+				D06B492024D3FB8000642749 /* Localizable.strings in Resources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
-		D047FA9A24C3E21200AF17C5 /* Resources */ = {
+		D0666A1F24C677B400F3F04B /* Resources */ = {
-			isa = PBXResourcesBuildPhase;
-			buildActionMask = 2147483647;
-			files = (
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-		D047FAA524C3E21200AF17C5 /* Resources */ = {
 			isa = PBXResourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
@@ -304,13 +550,95 @@
 		};
 /* End PBXResourcesBuildPhase section */
 
+/* Begin PBXShellScriptBuildPhase section */
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+			shellPath = /bin/sh;
+			shellScript = "if which swiftlint >/dev/null; then\n  swiftlint\nelse\n  echo \"warning: SwiftLint not installed, download from https://github.com/realm/SwiftLint\"\nfi\n";
+		};
+		D0666A2F24C67F1400F3F04B /* ShellScript */ = {
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+			shellPath = /bin/sh;
+			shellScript = "if which swiftlint >/dev/null; then\n  swiftlint\nelse\n  echo \"warning: SwiftLint not installed, download from https://github.com/realm/SwiftLint\"\nfi\n";
+		};
+/* End PBXShellScriptBuildPhase section */
+
 /* Begin PBXSourcesBuildPhase section */
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 			isa = PBXSourcesBuildPhase;
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 			files = (
-				D047FAB024C3E21200AF17C5 /* ContentView.swift in Sources */,
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 				D047FAAE24C3E21200AF17C5 /* MetatextApp.swift in Sources */,
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+				D0666A5724C6C63400F3F04B /* MastodonDecoder.swift in Sources */,
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+				D0DC177424D0B58800A75C65 /* Keychain.swift in Sources */,
+				D074577724D29006004758DB /* StubbingWebAuthenticationSession.swift in Sources */,
+				D0ED1BCE24CF768200B4899C /* MastodonEndpoint.swift in Sources */,
+				D074577A24D29366004758DB /* URLSessionConfiguration+Extensions.swift in Sources */,
+				D0ED1BB724CE47F400B4899C /* WebAuthenticationSession.swift in Sources */,
+				D0666A7224C6E0D300F3F04B /* Secrets.swift in Sources */,
+				D0BEC95124CA2B7E00E864C4 /* TabNavigation.swift in Sources */,
+				D0ED1BC424CED54D00B4899C /* HTTPTarget.swift in Sources */,
+				D0C963FE24CC3812003BD330 /* Publisher+Extensions.swift in Sources */,
+				D0DC175B24D0154F00A75C65 /* MastodonAPI.swift in Sources */,
+				D0ED1BD124CF779B00B4899C /* MastodonTarget.swift in Sources */,
+				D065F53E24D3D20300741304 /* InstanceEndpoint.swift in Sources */,
+				D0666A6F24C6DFB300F3F04B /* AccessToken.swift in Sources */,
+				D0ED1BCB24CF744200B4899C /* MastodonClient.swift in Sources */,
 			);
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 				D047FAAF24C3E21200AF17C5 /* MetatextApp.swift in Sources */,
+				D0BEC94824CA22C400E864C4 /* TimelineViewModel.swift in Sources */,
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+				D0ED1BDB24CF963E00B4899C /* AppAuthorizationEndpoint.swift in Sources */,
+				D0ED1BE424CFA84400B4899C /* MastodonError.swift in Sources */,
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-			buildActionMask = 2147483647;
-			files = (
-				D047FAAC24C3E21200AF17C5 /* Tests_macOS.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
 /* End PBXSourcesBuildPhase section */
 
 /* Begin PBXTargetDependency section */
-		D047FA9E24C3E21200AF17C5 /* PBXTargetDependency */ = {
+		D0666A2724C677B400F3F04B /* PBXTargetDependency */ = {
 			isa = PBXTargetDependency;
 			target = D047FA8B24C3E21200AF17C5 /* Metatext (iOS) */;
-			targetProxy = D047FA9D24C3E21200AF17C5 /* PBXContainerItemProxy */;
+			targetProxy = D0666A2624C677B400F3F04B /* PBXContainerItemProxy */;
-		};
-		D047FAA924C3E21200AF17C5 /* PBXTargetDependency */ = {
-			isa = PBXTargetDependency;
-			target = D047FA9324C3E21200AF17C5 /* Metatext (macOS) */;
-			targetProxy = D047FAA824C3E21200AF17C5 /* PBXContainerItemProxy */;
 		};
 /* End PBXTargetDependency section */
 
@@ -472,6 +832,7 @@
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
 				CODE_SIGN_STYLE = Automatic;
+				DEVELOPMENT_ASSET_PATHS = "Development\\ Assets";
 				DEVELOPMENT_TEAM = 82HL67AXQ2;
 				ENABLE_PREVIEWS = YES;
 				INFOPLIST_FILE = iOS/Info.plist;
@@ -494,6 +855,7 @@
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
 				CODE_SIGN_STYLE = Automatic;
+				DEVELOPMENT_ASSET_PATHS = "Development\\ Assets";
 				DEVELOPMENT_TEAM = 82HL67AXQ2;
 				ENABLE_PREVIEWS = YES;
 				INFOPLIST_FILE = iOS/Info.plist;
@@ -519,6 +881,7 @@
 				CODE_SIGN_ENTITLEMENTS = macOS/macOS.entitlements;
 				CODE_SIGN_STYLE = Automatic;
 				COMBINE_HIDPI_IMAGES = YES;
+				DEVELOPMENT_ASSET_PATHS = "Development\\ Assets";
 				DEVELOPMENT_TEAM = 82HL67AXQ2;
 				ENABLE_HARDENED_RUNTIME = YES;
 				ENABLE_PREVIEWS = YES;
@@ -543,6 +906,7 @@
 				CODE_SIGN_ENTITLEMENTS = macOS/macOS.entitlements;
 				CODE_SIGN_STYLE = Automatic;
 				COMBINE_HIDPI_IMAGES = YES;
+				DEVELOPMENT_ASSET_PATHS = "Development\\ Assets";
 				DEVELOPMENT_TEAM = 82HL67AXQ2;
 				ENABLE_HARDENED_RUNTIME = YES;
 				ENABLE_PREVIEWS = YES;
@@ -559,95 +923,54 @@
 			};
 			name = Release;
 		};
-		D047FABD24C3E21200AF17C5 /* Debug */ = {
+		D0666A2924C677B400F3F04B /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES = YES;
+				BUNDLE_LOADER = "$(TEST_HOST)";
+				CLANG_ENABLE_MODULES = YES;
 				CODE_SIGN_STYLE = Automatic;
 				DEVELOPMENT_TEAM = 82HL67AXQ2;
-				INFOPLIST_FILE = "Tests iOS/Info.plist";
+				INFOPLIST_FILE = Tests/Info.plist;
 				IPHONEOS_DEPLOYMENT_TARGET = 14.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
 					"@loader_path/Frameworks",
 				);
-				PRODUCT_BUNDLE_IDENTIFIER = "com.metabolist.Tests-iOS";
+				PRODUCT_BUNDLE_IDENTIFIER = "com.metabolist.Unit-Tests";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SDKROOT = iphoneos;
+				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
 				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
-				TEST_TARGET_NAME = "Metatext (iOS)";
+				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/Metatext.app/Metatext";
 			};
 			name = Debug;
 		};
-		D047FABE24C3E21200AF17C5 /* Release */ = {
+		D0666A2A24C677B400F3F04B /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES = YES;
+				BUNDLE_LOADER = "$(TEST_HOST)";
+				CLANG_ENABLE_MODULES = YES;
 				CODE_SIGN_STYLE = Automatic;
 				DEVELOPMENT_TEAM = 82HL67AXQ2;
-				INFOPLIST_FILE = "Tests iOS/Info.plist";
+				INFOPLIST_FILE = Tests/Info.plist;
 				IPHONEOS_DEPLOYMENT_TARGET = 14.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
 					"@loader_path/Frameworks",
 				);
-				PRODUCT_BUNDLE_IDENTIFIER = "com.metabolist.Tests-iOS";
+				PRODUCT_BUNDLE_IDENTIFIER = "com.metabolist.Unit-Tests";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SDKROOT = iphoneos;
 				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
-				TEST_TARGET_NAME = "Metatext (iOS)";
+				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/Metatext.app/Metatext";
 				VALIDATE_PRODUCT = YES;
 			};
 			name = Release;
 		};
-		D047FAC024C3E21200AF17C5 /* Debug */ = {
-			isa = XCBuildConfiguration;
-			buildSettings = {
-				ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES = YES;
-				CODE_SIGN_STYLE = Automatic;
-				COMBINE_HIDPI_IMAGES = YES;
-				DEVELOPMENT_TEAM = 82HL67AXQ2;
-				INFOPLIST_FILE = "Tests macOS/Info.plist";
-				LD_RUNPATH_SEARCH_PATHS = (
-					"$(inherited)",
-					"@executable_path/../Frameworks",
-					"@loader_path/../Frameworks",
-				);
-				MACOSX_DEPLOYMENT_TARGET = 10.16;
-				PRODUCT_BUNDLE_IDENTIFIER = "com.metabolist.Tests-macOS";
-				PRODUCT_NAME = "$(TARGET_NAME)";
-				SDKROOT = macosx;
-				SWIFT_VERSION = 5.0;
-				TEST_TARGET_NAME = "Metatext (macOS)";
-			};
-			name = Debug;
-		};
-		D047FAC124C3E21200AF17C5 /* Release */ = {
-			isa = XCBuildConfiguration;
-			buildSettings = {
-				ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES = YES;
-				CODE_SIGN_STYLE = Automatic;
-				COMBINE_HIDPI_IMAGES = YES;
-				DEVELOPMENT_TEAM = 82HL67AXQ2;
-				INFOPLIST_FILE = "Tests macOS/Info.plist";
-				LD_RUNPATH_SEARCH_PATHS = (
-					"$(inherited)",
-					"@executable_path/../Frameworks",
-					"@loader_path/../Frameworks",
-				);
-				MACOSX_DEPLOYMENT_TARGET = 10.16;
-				PRODUCT_BUNDLE_IDENTIFIER = "com.metabolist.Tests-macOS";
-				PRODUCT_NAME = "$(TARGET_NAME)";
-				SDKROOT = macosx;
-				SWIFT_VERSION = 5.0;
-				TEST_TARGET_NAME = "Metatext (macOS)";
-			};
-			name = Release;
-		};
 /* End XCBuildConfiguration section */
 
 /* Begin XCConfigurationList section */
@@ -678,25 +1001,71 @@
 			defaultConfigurationIsVisible = 0;
 			defaultConfigurationName = Release;
 		};
-		D047FABC24C3E21200AF17C5 /* Build configuration list for PBXNativeTarget "Tests iOS" */ = {
+		D0666A2824C677B400F3F04B /* Build configuration list for PBXNativeTarget "Tests" */ = {
 			isa = XCConfigurationList;
 			buildConfigurations = (
-				D047FABD24C3E21200AF17C5 /* Debug */,
+				D0666A2924C677B400F3F04B /* Debug */,
-				D047FABE24C3E21200AF17C5 /* Release */,
+				D0666A2A24C677B400F3F04B /* Release */,
-			);
-			defaultConfigurationIsVisible = 0;
-			defaultConfigurationName = Release;
-		};
-		D047FABF24C3E21200AF17C5 /* Build configuration list for PBXNativeTarget "Tests macOS" */ = {
-			isa = XCConfigurationList;
-			buildConfigurations = (
-				D047FAC024C3E21200AF17C5 /* Debug */,
-				D047FAC124C3E21200AF17C5 /* Release */,
 			);
 			defaultConfigurationIsVisible = 0;
 			defaultConfigurationName = Release;
 		};
 /* End XCConfigurationList section */
+
+/* Begin XCRemoteSwiftPackageReference section */
+		D065F53724D37E5100741304 /* XCRemoteSwiftPackageReference "CombineExpectations" */ = {
+			isa = XCRemoteSwiftPackageReference;
+			repositoryURL = "https://github.com/groue/CombineExpectations";
+			requirement = {
+				kind = upToNextMajorVersion;
+				minimumVersion = 0.5.0;
+			};
+		};
+		D0666A4724C6C1A300F3F04B /* XCRemoteSwiftPackageReference "GRDB" */ = {
+			isa = XCRemoteSwiftPackageReference;
+			repositoryURL = "https://github.com/groue/GRDB.swift";
+			requirement = {
+				kind = upToNextMajorVersion;
+				minimumVersion = "5.0.0-beta.10";
+			};
+		};
+		D0DC175D24D016EA00A75C65 /* XCRemoteSwiftPackageReference "Alamofire" */ = {
+			isa = XCRemoteSwiftPackageReference;
+			repositoryURL = "https://github.com/Alamofire/Alamofire";
+			requirement = {
+				kind = upToNextMajorVersion;
+				minimumVersion = 5.2.2;
+			};
+		};
+/* End XCRemoteSwiftPackageReference section */
+
+/* Begin XCSwiftPackageProductDependency section */
+		D065F53824D37E5100741304 /* CombineExpectations */ = {
+			isa = XCSwiftPackageProductDependency;
+			package = D065F53724D37E5100741304 /* XCRemoteSwiftPackageReference "CombineExpectations" */;
+			productName = CombineExpectations;
+		};
+		D0666A4824C6C1A300F3F04B /* GRDB */ = {
+			isa = XCSwiftPackageProductDependency;
+			package = D0666A4724C6C1A300F3F04B /* XCRemoteSwiftPackageReference "GRDB" */;
+			productName = GRDB;
+		};
+		D0666A7C24C7745A00F3F04B /* GRDB */ = {
+			isa = XCSwiftPackageProductDependency;
+			package = D0666A4724C6C1A300F3F04B /* XCRemoteSwiftPackageReference "GRDB" */;
+			productName = GRDB;
+		};
+		D0DC175E24D016EA00A75C65 /* Alamofire */ = {
+			isa = XCSwiftPackageProductDependency;
+			package = D0DC175D24D016EA00A75C65 /* XCRemoteSwiftPackageReference "Alamofire" */;
+			productName = Alamofire;
+		};
+		D0DC176024D0171800A75C65 /* Alamofire */ = {
+			isa = XCSwiftPackageProductDependency;
+			package = D0DC175D24D016EA00A75C65 /* XCRemoteSwiftPackageReference "Alamofire" */;
+			productName = Alamofire;
+		};
+/* End XCSwiftPackageProductDependency section */
 	};
 	rootObject = D047FA8024C3E21000AF17C5 /* Project object */;
 }

Metatext.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved

@@ -0,0 +1,34 @@
+{
+  "object": {
+    "pins": [
+      {
+        "package": "Alamofire",
+        "repositoryURL": "https://github.com/Alamofire/Alamofire",
+        "state": {
+          "branch": null,
+          "revision": "becd9a729a37bdbef5bc39dc3c702b99f9e3d046",
+          "version": "5.2.2"
+        }
+      },
+      {
+        "package": "CombineExpectations",
+        "repositoryURL": "https://github.com/groue/CombineExpectations",
+        "state": {
+          "branch": null,
+          "revision": "96d5604151c94b21fbca6877b237e80af9e821dd",
+          "version": "0.5.0"
+        }
+      },
+      {
+        "package": "GRDB",
+        "repositoryURL": "https://github.com/groue/GRDB.swift",
+        "state": {
+          "branch": null,
+          "revision": "ededd8668abd5a3c4c43cc9ebcfd611082b47f65",
+          "version": "5.0.0-beta.10"
+        }
+      }
+    ]
+  },
+  "version": 1
+}

Metatext.xcodeproj/xcshareddata/xcschemes/Metatext (iOS).xcscheme

@@ -0,0 +1,109 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "1200"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "D047FA8B24C3E21200AF17C5"
+               BuildableName = "Metatext.app"
+               BlueprintName = "Metatext (iOS)"
+               ReferencedContainer = "container:Metatext.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      codeCoverageEnabled = "YES">
+      <Testables>
+         <TestableReference
+            skipped = "NO">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "D047FA9B24C3E21200AF17C5"
+               BuildableName = "Tests iOS.xctest"
+               BlueprintName = "Tests iOS"
+               ReferencedContainer = "container:Metatext.xcodeproj">
+            </BuildableReference>
+         </TestableReference>
+         <TestableReference
+            skipped = "NO">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "D0666A0D24C6737800F3F04B"
+               BuildableName = "MetatextTests.xctest"
+               BlueprintName = "MetatextTests"
+               ReferencedContainer = "container:Metatext.xcodeproj">
+            </BuildableReference>
+         </TestableReference>
+         <TestableReference
+            skipped = "NO">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "D0666A2024C677B400F3F04B"
+               BuildableName = "Tests.xctest"
+               BlueprintName = "Tests"
+               ReferencedContainer = "container:Metatext.xcodeproj">
+            </BuildableReference>
+         </TestableReference>
+      </Testables>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "D047FA8B24C3E21200AF17C5"
+            BuildableName = "Metatext.app"
+            BlueprintName = "Metatext (iOS)"
+            ReferencedContainer = "container:Metatext.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Release"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "D047FA8B24C3E21200AF17C5"
+            BuildableName = "Metatext.app"
+            BlueprintName = "Metatext (iOS)"
+            ReferencedContainer = "container:Metatext.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>

Metatext.xcodeproj/xcuserdata/justin.xcuserdatad/xcschemes/xcschememanagement.plist

@@ -1,19 +0,0 @@
-<?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>SchemeUserState</key>
-	<dict>
-		<key>Metatext (iOS).xcscheme_^#shared#^_</key>
-		<dict>
-			<key>orderHint</key>
-			<integer>0</integer>
-		</dict>
-		<key>Metatext (macOS).xcscheme_^#shared#^_</key>
-		<dict>
-			<key>orderHint</key>
-			<integer>1</integer>
-		</dict>
-	</dict>
-</dict>
-</plist>

Shared/Extensions/NSError+Extensions.swift

@@ -0,0 +1,15 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import Foundation
+
+extension NSError {
+    convenience init(status: OSStatus) {
+        var userInfo: [String: Any]?
+
+        if let errorMessage = SecCopyErrorMessageString(status, nil) {
+            userInfo = [NSLocalizedDescriptionKey: errorMessage]
+        }
+
+        self.init(domain: NSOSStatusErrorDomain, code: Int(status), userInfo: userInfo)
+    }
+}

Shared/Extensions/Publisher+Extensions.swift

@@ -0,0 +1,19 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import Foundation
+import Combine
+
+extension Publisher {
+    func assignErrorsToAlertItem<Root>(
+        to keyPath: ReferenceWritableKeyPath<Root, AlertItem?>,
+        on object: Root) -> AnyPublisher<Output, Never> {
+        self.catch { error -> AnyPublisher<Output, Never> in
+            DispatchQueue.main.async {
+                object[keyPath: keyPath] = AlertItem(error: error)
+            }
+
+            return Empty().eraseToAnyPublisher()
+        }
+        .eraseToAnyPublisher()
+    }
+}

Shared/Extensions/String+Extensions.swift

@@ -0,0 +1,21 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import Foundation
+
+extension String {
+    private static let colonDoubleSlash = "://"
+
+    func url(scheme: String = "https") throws -> URL {
+        let url: URL?
+
+        if hasPrefix(scheme + Self.colonDoubleSlash) {
+            url = URL(string: self)
+        } else {
+            url = URL(string: scheme + Self.colonDoubleSlash + self)
+        }
+
+        guard let validURL = url else { throw URLError(.badURL) }
+
+        return validURL
+    }
+}

Shared/Extensions/View+Extensions.swift

@@ -0,0 +1,12 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import Foundation
+import SwiftUI
+
+extension View {
+    func alertItem(_ alertItem: Binding<AlertItem?>) -> some View {
+        alert(item: alertItem) {
+            Alert(title: Text($0.error.localizedDescription))
+        }
+    }
+}

Shared/Localizations/Localizable.strings

@@ -0,0 +1,5 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+"go" = "Go";
+"add-identity.instance-url" = "Instance URL";
+"oauth.error.code-not-found" = "OAuth error: code not found";

Shared/MetatextApp.swift

@@ -4,9 +4,25 @@ import SwiftUI
 
 @main
 struct MetatextApp: App {
+    private let identityDatabase: IdentityDatabase
+    private let secrets = Secrets(keychain: Keychain(service: "com.metabolist.metatext"))
+
+    init() {
+        do {
+            try identityDatabase = IdentityDatabase()
+        } catch {
+            fatalError("Failed to initialize identity database")
+        }
+    }
+
     var body: some Scene {
         WindowGroup {
             ContentView()
+                .environmentObject(
+                    SceneViewModel(
+                        networkClient: MastodonClient(),
+                        identityDatabase: identityDatabase,
+                        secrets: secrets))
         }
     }
 }

Shared/Model/AccessToken.swift

@@ -0,0 +1,9 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import Foundation
+
+struct AccessToken: Codable {
+    let scope: String
+    let tokenType: String
+    let accessToken: String
+}

Shared/Model/Account.swift

@@ -0,0 +1,32 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import Foundation
+
+struct Account: Codable, Hashable {
+    struct Field: Codable, Hashable {
+        let name: String
+        let value: String
+        let verifiedAt: Date?
+    }
+
+    let id: String
+    let username: String
+    let acct: String
+    let displayName: String
+    let locked: Bool
+    let createdAt: Date
+    let followersCount: Int
+    let followingCount: Int
+    let statusesCount: Int
+    let note: String
+    let url: URL
+    let avatar: URL
+    let avatarStatic: URL
+    let header: URL
+    let headerStatic: URL
+    let fields: [Field]
+    let emojis: [Emoji]
+    let bot: Bool?
+    let moved: Bool?
+    let discoverable: Bool?
+}

Shared/Model/AlertItem.swift

@@ -0,0 +1,8 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import Foundation
+
+struct AlertItem: Identifiable {
+    let id = UUID()
+    let error: Error
+}

Shared/Model/AppAuthorization.swift

@@ -0,0 +1,13 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import Foundation
+
+struct AppAuthorization: Codable {
+    let id: String
+    let clientId: String
+    let clientSecret: String
+    let name: String
+    let redirectUri: String
+    let website: String?
+    let vapidKey: String?
+}

Shared/Model/Application.swift

@@ -0,0 +1,8 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import Foundation
+
+struct Application: Codable {
+    let name: String
+    let website: String
+}

Shared/Model/DatabaseError.swift

@@ -0,0 +1,7 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import Foundation
+
+enum DatabaseError: Error {
+    case documentsDirectoryNotFound
+}

Shared/Model/Emoji.swift

@@ -0,0 +1,10 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import Foundation
+
+struct Emoji: Codable, Hashable {
+    let shortcode: String
+    let staticUrl: URL
+    let url: URL
+    let visibleInPicker: Bool
+}

Shared/Model/Identity.swift

@@ -0,0 +1,40 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import Foundation
+
+struct Identity: Codable, Hashable {
+    let id: String
+    let url: URL
+    let instance: Identity.Instance?
+    let account: Identity.Account?
+}
+
+extension Identity {
+    struct Instance: Codable, Hashable {
+        let uri: String
+        let streamingAPI: URL
+        let title: String
+        let thumbnail: URL?
+    }
+
+    struct Account: Codable, Hashable {
+        let id: String
+        let identityID: String
+        let username: String
+        let url: URL
+        let avatar: URL
+        let avatarStatic: URL
+        let header: URL
+        let headerStatic: URL
+    }
+}
+
+extension Identity {
+    var handle: String {
+        if let account = account, let host = account.url.host {
+            return account.url.lastPathComponent + "@" + host
+        }
+
+        return instance?.title ?? url.host ?? url.absoluteString
+    }
+}

Shared/Model/IdentityDatabase.swift

@@ -0,0 +1,163 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import Foundation
+import Combine
+import GRDB
+
+struct IdentityDatabase {
+    private let databaseQueue: DatabaseQueue
+
+    init(inMemory: Bool = false) throws {
+        guard
+            let documentsDirectory = NSSearchPathForDirectoriesInDomains(
+                .documentDirectory,
+                .userDomainMask, true)
+                .first
+        else { throw DatabaseError.documentsDirectoryNotFound }
+
+        if inMemory {
+            databaseQueue = DatabaseQueue()
+        } else {
+            databaseQueue = try DatabaseQueue(path: "\(documentsDirectory)/IdentityDatabase.sqlite3")
+        }
+
+        try Self.migrate(databaseQueue)
+    }
+}
+
+extension IdentityDatabase {
+    func createIdentity(id: String, url: URL) -> AnyPublisher<Identity, Error> {
+        databaseQueue.writePublisher {
+            try StoredIdentity(id: id, url: url, instanceURI: nil).save($0)
+
+            return Identity(id: id, url: url, instance: nil, account: nil)
+        }
+        .eraseToAnyPublisher()
+    }
+
+    func updateInstance(_ instance: Instance, forIdentityID identityID: String) -> AnyPublisher<Identity?, Error> {
+        databaseQueue.writePublisher {
+            try Identity.Instance(
+                uri: instance.uri,
+                streamingAPI: instance.urls.streamingApi,
+                title: instance.title,
+                thumbnail: instance.thumbnail)
+                .save($0)
+            try StoredIdentity
+                .filter(Column("id") == identityID)
+                .updateAll($0, Column("instanceURI").set(to: instance.uri))
+
+            return try Self.fetchIdentity(id: identityID, db: $0)
+        }
+        .eraseToAnyPublisher()
+    }
+
+    func updateAccount(_ account: Account, forIdentityID identityID: String) -> AnyPublisher<Identity?, Error> {
+        databaseQueue.writePublisher {
+            try Identity.Account(
+                id: account.id,
+                identityID: identityID,
+                username: account.username,
+                url: account.url,
+                avatar: account.avatar,
+                avatarStatic: account.avatarStatic,
+                header: account.header,
+                headerStatic: account.headerStatic)
+                .save($0)
+
+            return try Self.fetchIdentity(id: identityID, db: $0)
+        }
+        .eraseToAnyPublisher()
+    }
+
+    func identity(id: String) throws -> Identity? {
+        try databaseQueue.read { try Self.fetchIdentity(id: id, db: $0) }
+    }
+}
+
+private extension IdentityDatabase {
+    private static func migrate(_ writer: DatabaseWriter) throws {
+        var migrator = DatabaseMigrator()
+
+        migrator.registerMigration("createIdentities") { db in
+            try db.create(table: "instance", ifNotExists: true) { t in
+                t.column("uri", .text).notNull().primaryKey(onConflict: .replace)
+                t.column("streamingAPI", .text)
+                t.column("title", .text)
+                t.column("thumbnail", .text)
+            }
+
+            try db.create(table: "storedIdentity", ifNotExists: true) { t in
+                t.column("id", .text).notNull().primaryKey(onConflict: .replace)
+                t.column("url", .text).notNull()
+                t.column("instanceURI", .text)
+                    .indexed()
+                    .references("instance", column: "uri")
+            }
+
+            try db.create(table: "account", ifNotExists: true) { t in
+                t.column("id", .text).notNull().primaryKey(onConflict: .replace)
+                t.column("identityID", .text)
+                    .notNull()
+                    .indexed()
+                    .references("storedIdentity", column: "id", onDelete: .cascade)
+                t.column("username", .text).notNull()
+                t.column("url", .text).notNull()
+                t.column("avatar", .text).notNull()
+                t.column("avatarStatic", .text).notNull()
+                t.column("header", .text).notNull()
+                t.column("headerStatic", .text).notNull()
+            }
+        }
+
+        try migrator.migrate(writer)
+    }
+
+    private static func fetchIdentity(id: String, db: Database) throws -> Identity? {
+        if let result = try StoredIdentity
+            .filter(Column("id") == id)
+            .including(optional: StoredIdentity.instance)
+            .including(optional: StoredIdentity.account)
+            .asRequest(of: IdentityResult.self)
+            .fetchOne(db) {
+            return Identity(result: result)
+        }
+
+        return nil
+    }
+}
+
+private struct StoredIdentity: Codable, Hashable, TableRecord, FetchableRecord, PersistableRecord {
+    let id: String
+    let url: URL
+    let instanceURI: String?
+}
+
+extension StoredIdentity {
+    static let instance = belongsTo(Identity.Instance.self, key: "instance")
+    static let account = hasOne(Identity.Account.self, key: "account")
+
+    var instance: QueryInterfaceRequest<Identity.Instance> {
+        request(for: Self.instance)
+    }
+
+    var account: QueryInterfaceRequest<Identity.Account> {
+        request(for: Self.account)
+    }
+}
+
+private struct IdentityResult: Codable, Hashable, FetchableRecord {
+    let identity: StoredIdentity
+    let instance: Identity.Instance?
+    let account: Identity.Account?
+}
+
+private extension Identity {
+    init(result: IdentityResult) {
+        self.init(id: result.identity.id, url: result.identity.url, instance: result.instance, account: result.account)
+    }
+}
+
+extension Identity.Instance: TableRecord, FetchableRecord, PersistableRecord {}
+
+extension Identity.Account: TableRecord, FetchableRecord, PersistableRecord {}

Shared/Model/Instance.swift

@@ -0,0 +1,30 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import Foundation
+
+struct Instance: Codable, Hashable {
+    struct URLs: Codable, Hashable {
+        let streamingApi: URL
+    }
+
+    struct Stats: Codable, Hashable {
+        let userCount: Int
+        let statusCount: Int
+        let domainCount: Int
+    }
+
+    let uri: String
+    let title: String
+    let description: String
+    let shortDescription: String?
+    let email: String
+    let version: String
+    let languages: [String]
+    let registrations: Bool?
+    let approvalRequired: Bool?
+    let invitesEnabled: Bool?
+    let urls: URLs
+    let stats: Stats
+    let thumbnail: URL?
+    let contactAccount: Account?
+}

Shared/Model/Keychain.swift

@@ -0,0 +1,64 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import Foundation
+
+protocol KeychainType {
+    mutating func set(data: Data, forKey key: String) throws
+    mutating func deleteData(key: String) throws
+    func getData(key: String) throws -> Data?
+}
+
+struct Keychain {
+    let service: String
+}
+
+extension Keychain: KeychainType {
+    mutating func set(data: Data, forKey key: String) throws {
+        var query = queryDictionary(key: key)
+
+        query[kSecValueData as String] = data
+
+        let status = SecItemAdd(query as CFDictionary, nil)
+
+        if status != errSecSuccess {
+            throw NSError(status: status)
+        }
+    }
+
+    mutating func deleteData(key: String) throws {
+        let status = SecItemDelete(queryDictionary(key: key) as CFDictionary)
+
+        if status != errSecSuccess {
+            throw NSError(status: status)
+        }
+    }
+
+    func getData(key: String) throws -> Data? {
+        var result: AnyObject?
+        var query = queryDictionary(key: key)
+
+        query[kSecMatchLimit as String] = kSecMatchLimitOne
+        query[kSecReturnData as String] = kCFBooleanTrue
+
+        let status = SecItemCopyMatching(query as CFDictionary, &result)
+
+        switch status {
+        case errSecSuccess:
+            return result as? Data
+        case errSecItemNotFound:
+            return nil
+        default:
+            throw NSError(status: status)
+        }
+    }
+}
+
+private extension Keychain {
+    private func queryDictionary(key: String) -> [String: Any] {
+        [
+            kSecAttrService as String: service,
+            kSecAttrAccount as String: key,
+            kSecClass as String: kSecClassGenericPassword
+        ]
+    }
+}

Shared/Model/MastodonError.swift

@@ -0,0 +1,11 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import Foundation
+
+struct MastodonError: Error, Codable {
+    let error: String
+}
+
+extension MastodonError: LocalizedError {
+    var errorDescription: String? { error }
+}

Shared/Model/Secrets.swift

@@ -0,0 +1,70 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import Foundation
+
+protocol SecretsStorable {
+    var dataStoredInSecrets: Data { get }
+    static func fromDataStoredInSecrets(_ data: Data) throws -> Self
+}
+
+enum SecretsStorableError: Error {
+    case conversionFromDataStoredInSecrets(Data)
+}
+
+class Secrets {
+    private var keychain: KeychainType
+
+    init(keychain: KeychainType) {
+        self.keychain = keychain
+    }
+}
+
+extension Secrets {
+    enum Item: String {
+        case clientID = "client-id"
+        case clientSecret = "client-secret"
+        case accessToken = "access-token"
+    }
+}
+
+extension Secrets {
+    func set(_ data: SecretsStorable, forItem item: Item, forIdentityID identityID: String) throws {
+        try keychain.set(data: data.dataStoredInSecrets, forKey: Self.key(item: item, identityID: identityID))
+    }
+
+    func item<T: SecretsStorable>(_ item: Item, forIdentityID identityID: String) throws -> T? {
+        guard let data = try keychain.getData(key: Self.key(item: item, identityID: identityID)) else { return nil }
+
+        return try T.fromDataStoredInSecrets(data)
+    }
+
+    func delete(_ item: Item, forIdentityID identityID: String) throws {
+        try keychain.deleteData(key: Self.key(item: item, identityID: identityID))
+    }
+}
+
+private extension Secrets {
+    static func key(item: Item, identityID: String) -> String {
+        identityID + "." + item.rawValue
+    }
+}
+
+extension Data: SecretsStorable {
+    var dataStoredInSecrets: Data { self }
+
+    static func fromDataStoredInSecrets(_ data: Data) throws -> Data {
+        data
+    }
+}
+
+extension String: SecretsStorable {
+    var dataStoredInSecrets: Data { Data(utf8) }
+
+    static func fromDataStoredInSecrets(_ data: Data) throws -> String {
+        guard let string = String(data: data, encoding: .utf8) else {
+            throw SecretsStorableError.conversionFromDataStoredInSecrets(data)
+        }
+
+        return string
+    }
+}

Shared/Networking/HTTPClient.swift

@@ -0,0 +1,57 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import Foundation
+import Combine
+import Alamofire
+
+class HTTPClient {
+    private let session: Session
+    private let decoder: DataDecoder
+
+    init(
+        configuration: URLSessionConfiguration = URLSessionConfiguration.af.default,
+        decoder: DataDecoder = JSONDecoder()) {
+        self.session = Session(configuration: configuration)
+        self.decoder = decoder
+    }
+
+    func request<T: DecodableTarget>(_ target: T) -> AnyPublisher<T.ResultType, Error> {
+        requestPublisher(target).value().mapError { $0 as Error }.eraseToAnyPublisher()
+    }
+
+    func request<T: DecodableTarget, E: Error & Decodable>(
+        _ target: T,
+        decodeErrorsAs errorType: E.Type) -> AnyPublisher<T.ResultType, Error> {
+        let decoder = self.decoder
+
+        return requestPublisher(target)
+            .tryMap { response -> T.ResultType in
+                switch response.result {
+                case let .success(decoded): return decoded
+                case let .failure(error):
+                    if
+                        let data = response.data,
+                        let decodedError = try? decoder.decode(E.self, from: data) {
+                        throw decodedError
+                    }
+
+                    throw error
+                }
+            }
+            .eraseToAnyPublisher()
+    }
+}
+
+private extension HTTPClient {
+    private func requestPublisher<T: DecodableTarget>(_ target: T) -> DataResponsePublisher<T.ResultType> {
+        #if DEBUG
+        if let url = try? target.asURLRequest().url {
+            StubbingURLProtocol.setTarget(target, forURL: url)
+        }
+        #endif
+
+        return session.request(target)
+            .validate()
+            .publishDecodable(type: T.ResultType.self, decoder: decoder)
+    }
+}

Shared/Networking/HTTPTarget.swift

@@ -0,0 +1,29 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import Foundation
+import Alamofire
+
+protocol HTTPTarget: URLRequestConvertible {
+    var baseURL: URL { get }
+    var pathComponents: [String] { get }
+    var method: HTTPMethod { get }
+    var encoding: ParameterEncoding { get }
+    var parameters: [String: Any]? { get }
+    var headers: HTTPHeaders? { get }
+}
+
+extension HTTPTarget {
+    func asURLRequest() throws -> URLRequest {
+        var url = baseURL
+
+        for pathComponent in pathComponents {
+            url.appendPathComponent(pathComponent)
+        }
+
+        return try encoding.encode(try URLRequest(url: url, method: method, headers: headers), with: parameters)
+    }
+}
+
+protocol DecodableTarget: HTTPTarget {
+    associatedtype ResultType: Decodable
+}

Shared/Networking/Mastodon API/AccessTokenEndpoint.swift

@@ -0,0 +1,45 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import Foundation
+import Alamofire
+
+enum AccessTokenEndpoint {
+    case oauthToken(
+        clientID: String,
+        clientSecret: String,
+        code: String,
+        grantType: String,
+        scopes: String,
+        redirectURI: String
+    )
+}
+
+extension AccessTokenEndpoint: MastodonEndpoint {
+    typealias ResultType = AccessToken
+
+    var context: [String] { [] }
+
+    var pathComponentsInContext: [String] {
+        ["oauth", "token"]
+    }
+
+    var method: HTTPMethod {
+        switch self {
+        case .oauthToken: return .post
+        }
+    }
+
+    var parameters: [String: Any]? {
+        switch self {
+        case let .oauthToken(clientID, clientSecret, code, grantType, scopes, redirectURI):
+            return [
+                "client_id": clientID,
+                "client_secret": clientSecret,
+                "code": code,
+                "grant_type": grantType,
+                "scope": scopes,
+                "redirect_uri": redirectURI
+            ]
+        }
+    }
+}

Shared/Networking/Mastodon API/AccountEndpoint.swift

@@ -0,0 +1,28 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import Foundation
+import Alamofire
+
+enum AccountEndpoint {
+    case verifyCredentials
+}
+
+extension AccountEndpoint: MastodonEndpoint {
+    typealias ResultType = Account
+
+    var context: [String] {
+        defaultContext + ["accounts"]
+    }
+
+    var pathComponentsInContext: [String] {
+        switch self {
+        case .verifyCredentials: return ["verify_credentials"]
+        }
+    }
+
+    var method: HTTPMethod {
+        switch self {
+        case .verifyCredentials: return .get
+        }
+    }
+}

Shared/Networking/Mastodon API/AppAuthorizationEndpoint.swift

@@ -0,0 +1,39 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import Foundation
+import Alamofire
+
+enum AppAuthorizationEndpoint {
+    case apps(clientName: String, redirectURI: String, scopes: String, website: URL?)
+}
+
+extension AppAuthorizationEndpoint: MastodonEndpoint {
+    typealias ResultType = AppAuthorization
+
+    var pathComponentsInContext: [String] {
+        switch self {
+        case .apps: return ["apps"]
+        }
+    }
+
+    var method: HTTPMethod {
+        switch self {
+        case .apps: return .post
+        }
+    }
+
+    var parameters: [String: Any]? {
+        switch self {
+        case let .apps(clientName, redirectURI, scopes, website):
+            var params = [
+                "client_name": clientName,
+                "redirect_uris": redirectURI,
+                "scopes": scopes
+            ]
+
+            params["website"] = website?.absoluteString
+
+            return params
+        }
+    }
+}

Shared/Networking/Mastodon API/InstanceEndpoint.swift

@@ -0,0 +1,24 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import Foundation
+import Alamofire
+
+enum InstanceEndpoint {
+    case instance
+}
+
+extension InstanceEndpoint: MastodonEndpoint {
+    typealias ResultType = Instance
+
+    var pathComponentsInContext: [String] {
+        switch self {
+        case .instance: return ["instance"]
+        }
+    }
+
+    var method: HTTPMethod {
+        switch self {
+        case .instance: return .get
+        }
+    }
+}

Shared/Networking/Mastodon API/MastodonAPI.swift

@@ -0,0 +1,28 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import Foundation
+
+struct MastodonAPI {
+    static let dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSZ"
+
+    struct OAuth {
+        static let clientName = "Metatext"
+        static let scopes = "read write follow push"
+        static let codeCallbackQueryItemName = "code"
+        static let grantType = "authorization_code"
+        static let callbackURLScheme = "metatext"
+    }
+
+    enum OAuthError {
+        case codeNotFound
+    }
+}
+
+extension MastodonAPI.OAuthError: LocalizedError {
+    var errorDescription: String? {
+        switch self {
+        case .codeNotFound:
+            return NSLocalizedString("oauth.error.code-not-found", comment: "")
+        }
+    }
+}

Shared/Networking/Mastodon API/MastodonClient.swift

@@ -0,0 +1,30 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import Foundation
+import Combine
+import Alamofire
+
+class MastodonClient: HTTPClient {
+    var instanceURL: URL?
+    var accessToken: String?
+
+    init(configuration: URLSessionConfiguration = URLSessionConfiguration.af.default) {
+        super.init(configuration: configuration, decoder: MastodonDecoder())
+    }
+
+    override func request<T: DecodableTarget>(_ target: T) -> AnyPublisher<T.ResultType, Error> {
+        super.request(target, decodeErrorsAs: MastodonError.self)
+    }
+}
+
+extension MastodonClient {
+    func request<E: MastodonEndpoint>(_ endpoint: E) -> AnyPublisher<E.ResultType, Error> {
+        guard let instanceURL = instanceURL else {
+            return Fail(error: URLError(.badURL)).eraseToAnyPublisher()
+        }
+
+        return super.request(
+            MastodonTarget(baseURL: instanceURL, endpoint: endpoint, accessToken: accessToken),
+            decodeErrorsAs: MastodonError.self)
+    }
+}

Shared/Networking/Mastodon API/MastodonEndpoint.swift

@@ -0,0 +1,42 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import Foundation
+import Alamofire
+
+protocol MastodonEndpoint {
+    associatedtype ResultType: Decodable
+    var APIVersion: String { get }
+    var context: [String] { get }
+    var pathComponentsInContext: [String] { get }
+    var method: HTTPMethod { get }
+    var encoding: ParameterEncoding { get }
+    var parameters: [String: Any]? { get }
+    var headers: HTTPHeaders? { get }
+}
+
+extension MastodonEndpoint {
+    var defaultContext: [String] {
+        ["api", APIVersion]
+    }
+
+    var APIVersion: String { "v1" }
+
+    var context: [String] {
+        defaultContext
+    }
+
+    var pathComponents: [String] {
+        context + pathComponentsInContext
+    }
+
+    var encoding: ParameterEncoding {
+        switch method {
+        case .get: return URLEncoding.default
+        default: return JSONEncoding.default
+        }
+    }
+
+    var parameters: [String: Any]? { nil }
+
+    var headers: HTTPHeaders? { nil }
+}

Shared/Networking/Mastodon API/MastodonTarget.swift

@@ -0,0 +1,36 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import Foundation
+import Alamofire
+
+struct MastodonTarget<E: MastodonEndpoint> {
+    let baseURL: URL
+    let endpoint: E
+    let accessToken: String?
+}
+
+extension MastodonTarget: DecodableTarget {
+    typealias ResultType = E.ResultType
+
+    var pathComponents: [String] { endpoint.pathComponents }
+
+    var method: HTTPMethod { endpoint.method }
+
+    var encoding: ParameterEncoding { endpoint.encoding }
+
+    var parameters: [String: Any]? { endpoint.parameters }
+
+    var headers: HTTPHeaders? {
+        var headers = endpoint.headers
+
+        if let accessToken = accessToken {
+            if headers == nil {
+                headers = HTTPHeaders()
+            }
+
+            headers?.add(.authorization(bearerToken: accessToken))
+        }
+
+        return headers
+    }
+}

Shared/Networking/MastodonDecoder.swift

@@ -0,0 +1,15 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import Foundation
+
+class MastodonDecoder: JSONDecoder {
+    override init() {
+        super.init()
+
+        let dateFormatter = DateFormatter()
+
+        dateFormatter.dateFormat = MastodonAPI.dateFormat
+        dateDecodingStrategy = .formatted(dateFormatter)
+        keyDecodingStrategy = .convertFromSnakeCase
+    }
+}

Shared/Networking/MastodonEncoder.swift

@@ -0,0 +1,16 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import Foundation
+
+class MastodonEncoder: JSONEncoder {
+    override init() {
+        super.init()
+
+        let dateFormatter = DateFormatter()
+
+        dateFormatter.dateFormat = MastodonAPI.dateFormat
+        dateEncodingStrategy = .formatted(dateFormatter)
+        keyEncodingStrategy = .convertToSnakeCase
+        outputFormatting = .sortedKeys
+    }
+}

Shared/Networking/WebAuthenticationSession.swift

@@ -0,0 +1,38 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import Foundation
+import AuthenticationServices
+import Combine
+
+protocol WebAuthenticationSessionType: AnyObject {
+    init(url URL: URL,
+         callbackURLScheme: String?,
+         completionHandler: @escaping ASWebAuthenticationSession.CompletionHandler)
+    var presentationContextProvider: ASWebAuthenticationPresentationContextProviding? { get set }
+    @discardableResult func start() -> Bool
+}
+
+extension ASWebAuthenticationSession: WebAuthenticationSessionType {}
+
+extension WebAuthenticationSessionType {
+    static func publisher(
+        url: URL,
+        callbackURLScheme: String?,
+        presentationContextProvider: ASWebAuthenticationPresentationContextProviding) -> AnyPublisher<URL?, Error> {
+        Future<URL?, Error> { promise in
+            let webAuthenticationSession = Self(
+                url: url,
+                callbackURLScheme: callbackURLScheme) { oauthCallbackURL, error in
+                if let error = error {
+                    return promise(.failure(error))
+                }
+
+                return promise(.success(oauthCallbackURL))
+            }
+
+            webAuthenticationSession.presentationContextProvider = presentationContextProvider
+            webAuthenticationSession.start()
+        }
+        .eraseToAnyPublisher()
+    }
+}

Shared/View Models/AddIdentityViewModel.swift

@@ -0,0 +1,208 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import Foundation
+import Combine
+import AuthenticationServices
+
+class AddIdentityViewModel: ObservableObject {
+    @Published var urlFieldText = ""
+    @Published var alertItem: AlertItem?
+    @Published private(set) var loading = false
+    private(set) var addedIdentity: AnyPublisher<Identity, Never>
+
+    private let networkClient: HTTPClient
+    private let identityDatabase: IdentityDatabase
+    private let secrets: Secrets
+    private let webAuthenticationSessionType: WebAuthenticationSessionType.Type
+    private let webAuthenticationSessionContextProvider = WebAuthenticationSessionContextProvider()
+    private let addedIdentityInput = PassthroughSubject<Identity, Never>()
+    private var cancellables = Set<AnyCancellable>()
+
+    init(
+        networkClient: HTTPClient,
+        identityDatabase: IdentityDatabase,
+        secrets: Secrets,
+        webAuthenticationSessionType: WebAuthenticationSessionType.Type = ASWebAuthenticationSession.self) {
+        self.networkClient = networkClient
+        self.identityDatabase = identityDatabase
+        self.secrets = secrets
+        self.webAuthenticationSessionType = webAuthenticationSessionType
+        addedIdentity = addedIdentityInput.eraseToAnyPublisher()
+    }
+
+    func goTapped() {
+        let identityID = UUID().uuidString
+        let instanceURL: URL
+        let redirectURL: URL
+
+        do {
+            instanceURL = try urlFieldText.url()
+            redirectURL = try identityID.url(scheme: MastodonAPI.OAuth.callbackURLScheme)
+        } catch {
+            alertItem = AlertItem(error: error)
+
+            return
+        }
+
+        authorizeApp(
+            identityID: identityID,
+            instanceURL: instanceURL,
+            redirectURL: redirectURL,
+            secrets: secrets)
+            .authenticationURL(instanceURL: instanceURL, redirectURL: redirectURL)
+            .authenticate(
+                webAuthenticationSessionType: webAuthenticationSessionType,
+                contextProvider: webAuthenticationSessionContextProvider,
+                callbackURLScheme: MastodonAPI.OAuth.callbackURLScheme)
+            .extractCode()
+            .requestAccessToken(
+                networkClient: networkClient,
+                identityID: identityID,
+                instanceURL: instanceURL)
+            .createIdentity(
+                id: identityID,
+                instanceURL: instanceURL,
+                identityDatabase: identityDatabase,
+                secrets: secrets)
+            .assignErrorsToAlertItem(to: \.alertItem, on: self)
+            .handleEvents(
+                receiveSubscription: { [weak self] _ in self?.loading = true },
+                receiveCompletion: { [weak self] _ in self?.loading = false  })
+            .sink(receiveValue: addedIdentityInput.send)
+            .store(in: &cancellables)
+    }
+}
+
+private extension AddIdentityViewModel {
+    private class WebAuthenticationSessionContextProvider: NSObject, ASWebAuthenticationPresentationContextProviding {
+        func presentationAnchor(for session: ASWebAuthenticationSession) -> ASPresentationAnchor {
+            ASPresentationAnchor()
+        }
+    }
+
+    private func authorizeApp(
+        identityID: String,
+        instanceURL: URL,
+        redirectURL: URL,
+        secrets: Secrets) -> AnyPublisher<AppAuthorization, Error> {
+        let endpoint = AppAuthorizationEndpoint.apps(
+            clientName: MastodonAPI.OAuth.clientName,
+            redirectURI: redirectURL.absoluteString,
+            scopes: MastodonAPI.OAuth.scopes,
+            website: nil)
+        let target = MastodonTarget(baseURL: instanceURL, endpoint: endpoint, accessToken: nil)
+
+        return networkClient.request(target)
+            .tryMap {
+                try secrets.set($0.clientId, forItem: .clientID, forIdentityID: identityID)
+                try secrets.set($0.clientSecret, forItem: .clientSecret, forIdentityID: identityID)
+
+                return $0
+            }
+            .eraseToAnyPublisher()
+    }
+}
+
+private extension Publisher where Output == AppAuthorization {
+    func authenticationURL(
+        instanceURL: URL,
+        redirectURL: URL) -> AnyPublisher<(AppAuthorization, URL), Error> {
+        tryMap { appAuthorization in
+            guard var authorizationURLComponents = URLComponents(url: instanceURL, resolvingAgainstBaseURL: true) else {
+                throw URLError(.badURL)
+            }
+
+            authorizationURLComponents.path = "/oauth/authorize"
+            authorizationURLComponents.queryItems = [
+                "client_id": appAuthorization.clientId,
+                "scope": MastodonAPI.OAuth.scopes,
+                "response_type": "code",
+                "redirect_uri": redirectURL.absoluteString
+            ].map { URLQueryItem(name: $0, value: $1) }
+
+            guard let authorizationURL = authorizationURLComponents.url else {
+                throw URLError(.badURL)
+            }
+
+            return (appAuthorization, authorizationURL)
+        }
+        .mapError { $0 as Error }
+        .eraseToAnyPublisher()
+    }
+}
+
+private extension Publisher where Output == (AppAuthorization, URL), Failure == Error {
+    func authenticate(
+        webAuthenticationSessionType: WebAuthenticationSessionType.Type,
+        contextProvider: ASWebAuthenticationPresentationContextProviding,
+        callbackURLScheme: String) -> AnyPublisher<(AppAuthorization, URL), Error> {
+        flatMap { appAuthorization, url in
+            webAuthenticationSessionType.publisher(
+                url: url,
+                callbackURLScheme: callbackURLScheme,
+                presentationContextProvider: contextProvider)
+                .tryCatch { error -> AnyPublisher<URL?, Error> in
+                    if (error as? ASWebAuthenticationSessionError)?.code == .canceledLogin {
+                        return Just(nil).setFailureType(to: Error.self).eraseToAnyPublisher()
+                    }
+
+                    throw error
+                }
+                .compactMap { $0 }
+                .map { (appAuthorization, $0) }
+        }
+        .eraseToAnyPublisher()
+    }
+}
+
+private extension Publisher where Output == (AppAuthorization, URL) {
+    // swiftlint:disable large_tuple
+    func extractCode() -> AnyPublisher<(AppAuthorization, URL, String), Error> {
+        tryMap { appAuthorization, url -> (AppAuthorization, URL, String) in
+            guard let queryItems = URLComponents(url: url, resolvingAgainstBaseURL: true)?.queryItems,
+                  let code = queryItems.first(where: { $0.name == MastodonAPI.OAuth.codeCallbackQueryItemName })?.value
+            else { throw MastodonAPI.OAuthError.codeNotFound }
+
+            return (appAuthorization, url, code)
+        }
+        .eraseToAnyPublisher()
+    }
+    // swiftlint:enable large_tuple
+}
+
+private extension Publisher where Output == (AppAuthorization, URL, String), Failure == Error {
+    func requestAccessToken(
+        networkClient: HTTPClient,
+        identityID: String,
+        instanceURL: URL) -> AnyPublisher<AccessToken, Error> {
+        flatMap { appAuthorization, url, code -> AnyPublisher<AccessToken, Error> in
+            let endpoint = AccessTokenEndpoint.oauthToken(
+                clientID: appAuthorization.clientId,
+                clientSecret: appAuthorization.clientSecret,
+                code: code,
+                grantType: MastodonAPI.OAuth.grantType,
+                scopes: MastodonAPI.OAuth.scopes,
+                redirectURI: url.absoluteString)
+            let target = MastodonTarget(baseURL: instanceURL, endpoint: endpoint, accessToken: nil)
+
+            return networkClient.request(target)
+        }
+        .eraseToAnyPublisher()
+    }
+}
+
+private extension Publisher where Output == AccessToken {
+    func createIdentity(
+        id: String,
+        instanceURL: URL,
+        identityDatabase: IdentityDatabase,
+        secrets: Secrets) -> AnyPublisher<Identity, Error> {
+        tryMap { accessToken -> (String, URL) in
+            try secrets.set(accessToken.accessToken, forItem: .accessToken, forIdentityID: id)
+
+            return (id, instanceURL)
+        }
+        .flatMap(identityDatabase.createIdentity)
+        .eraseToAnyPublisher()
+    }
+}

Shared/View Models/SceneViewModel.swift

@@ -0,0 +1,127 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import Foundation
+import Combine
+
+class SceneViewModel: ObservableObject {
+    @Published private(set) var identity: Identity? {
+        didSet {
+            if let identity = identity {
+                recentIdentityID = identity.id
+                networkClient.instanceURL = identity.url
+
+                do {
+                    networkClient.accessToken = try secrets.item(.accessToken, forIdentityID: identity.id)
+                } catch {
+                    alertItem = AlertItem(error: error)
+                }
+            }
+        }
+    }
+
+    @Published var alertItem: AlertItem?
+    var selectedTopLevelNavigation: TopLevelNavigation? = .timelines
+
+    private let networkClient: MastodonClient
+    private let identityDatabase: IdentityDatabase
+    private let secrets: Secrets
+    private let userDefaults: UserDefaults
+    private var cancellables = Set<AnyCancellable>()
+
+    init(networkClient: MastodonClient,
+         identityDatabase: IdentityDatabase,
+         secrets: Secrets,
+         userDefaults: UserDefaults = .standard) {
+        self.networkClient = networkClient
+        self.identityDatabase = identityDatabase
+        self.secrets = secrets
+        self.userDefaults = userDefaults
+
+        if let recentIdentityID = recentIdentityID {
+            identity = try? identityDatabase.identity(id: recentIdentityID)
+            refreshIdentity()
+        }
+    }
+}
+
+extension SceneViewModel {
+    func refreshIdentity() {
+        guard let identity = identity else { return }
+
+        if networkClient.accessToken != nil {
+            networkClient.request(AccountEndpoint.verifyCredentials)
+                .map { ($0, identity.id) }
+                .flatMap(identityDatabase.updateAccount)
+                .assignErrorsToAlertItem(to: \.alertItem, on: self)
+                .assign(to: \.identity, on: self)
+                .store(in: &cancellables)
+        }
+
+        networkClient.request(InstanceEndpoint.instance)
+            .map { ($0, identity.id) }
+            .flatMap(identityDatabase.updateInstance)
+            .assignErrorsToAlertItem(to: \.alertItem, on: self)
+            .assign(to: \.identity, on: self)
+            .store(in: &cancellables)
+    }
+
+    func addIdentityViewModel() -> AddIdentityViewModel {
+        let addAccountViewModel = AddIdentityViewModel(
+            networkClient: networkClient,
+            identityDatabase: identityDatabase,
+            secrets: secrets)
+
+        addAccountViewModel.addedIdentity
+            .sink(receiveValue: addIdentity(_:))
+            .store(in: &cancellables)
+
+        return addAccountViewModel
+    }
+}
+
+private extension SceneViewModel {
+    private static let recentIdentityIDKey = "recentIdentityID"
+
+    private var recentIdentityID: String? {
+        get { userDefaults.value(forKey: Self.recentIdentityIDKey) as? String }
+        set { userDefaults.set(newValue, forKey: Self.recentIdentityIDKey) }
+    }
+
+    private func addIdentity(_ identity: Identity) {
+        self.identity = identity
+        refreshIdentity()
+    }
+}
+
+extension SceneViewModel {
+    enum TopLevelNavigation: CaseIterable {
+        case timelines
+        case search
+        case notifications
+        case messages
+    }
+}
+
+extension SceneViewModel.TopLevelNavigation {
+    var title: String {
+        switch self {
+        case .timelines: return "Timelines"
+        case .search: return "Search"
+        case .notifications: return "Notifications"
+        case .messages: return "Messages"
+        }
+    }
+
+    var systemImageName: String {
+        switch self {
+        case .timelines: return "house"
+        case .search: return "magnifyingglass"
+        case .notifications: return "bell"
+        case .messages: return "envelope"
+        }
+    }
+}
+
+extension SceneViewModel.TopLevelNavigation: Identifiable {
+    var id: Self { self }
+}

Shared/View Models/TimelineViewModel.swift

@@ -0,0 +1,7 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import Foundation
+
+class TimelineViewModel: ObservableObject {
+
+}

Shared/Views/AddIdentityView.swift

@@ -0,0 +1,48 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import SwiftUI
+
+struct AddIdentityView: View {
+    @StateObject var viewModel: AddIdentityViewModel
+
+    var body: some View {
+        Form {
+            #if os(iOS)
+            urlTextField
+                .autocapitalization(.none)
+                .disableAutocorrection(true)
+                .keyboardType(.URL)
+            #else
+            urlTextField
+            #endif
+            Group {
+                if viewModel.loading {
+                    ProgressView()
+                } else {
+                    Button(
+                        action: viewModel.goTapped,
+                        label: { Text("go") })
+                }
+            }
+            .frame(maxWidth: .infinity, alignment: .center)
+        }
+        .alertItem($viewModel.alertItem)
+    }
+}
+
+extension AddIdentityView {
+    private var urlTextField: some View {
+        TextField("add-identity.instance-url", text: $viewModel.urlFieldText)
+    }
+}
+
+struct AddAccountView_Previews: PreviewProvider {
+    static var previews: some View {
+        AddIdentityView(viewModel: AddIdentityViewModel(
+                            networkClient: MastodonClient(configuration: .stubbing),
+                            // swiftlint:disable force_try
+                            identityDatabase: try! IdentityDatabase(inMemory: true),
+                            // swiftlint:enable force_try
+                            secrets: Secrets(keychain: FakeKeychain())))
+    }
+}

Shared/Views/ContentView.swift

@@ -0,0 +1,42 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import SwiftUI
+
+struct ContentView: View {
+    @EnvironmentObject var sceneViewModel: SceneViewModel
+    @Environment(\.scenePhase) private var scenePhase
+
+    var body: some View {
+        if sceneViewModel.identity != nil {
+            mainNavigation
+                .onChange(of: scenePhase) {
+                    if case .active = $0 {
+                        sceneViewModel.refreshIdentity()
+                    }
+                }
+                .alertItem($sceneViewModel.alertItem)
+        } else {
+            addIdentity
+        }
+    }
+}
+
+private extension ContentView {
+    private var mainNavigation: some View {
+        #if os(macOS)
+        return SidebarNavigation().frame(minWidth: 900, maxWidth: .infinity, minHeight: 500, maxHeight: .infinity)
+        #else
+        return TabNavigation()
+        #endif
+    }
+
+    private var addIdentity: some View {
+        AddIdentityView(viewModel: sceneViewModel.addIdentityViewModel())
+    }
+}
+
+//struct ContentView_Previews: PreviewProvider {
+//    static var previews: some View {
+//        ContentView()
+//    }
+//}

Shared/Views/TimelineView.swift

@@ -2,14 +2,14 @@
 
 import SwiftUI
 
-struct ContentView: View {
+struct TimelineView: View {
     var body: some View {
-        Text("Hello, world!").padding()
+        Text("Time of my life")
     }
 }
 
-struct ContentView_Previews: PreviewProvider {
+struct TimelineView_Previews: PreviewProvider {
     static var previews: some View {
-        ContentView()
+        TimelineView()
     }
 }

Tests iOS/Tests_iOS.swift

@@ -1,37 +0,0 @@
-// Copyright © 2020 Metabolist. All rights reserved.
-
-import XCTest
-
-class Tests_iOS: XCTestCase {
-
-    override func setUpWithError() throws {
-        // Put setup code here. This method is called before the invocation of each test method in the class.
-
-        // In UI tests it is usually best to stop immediately when a failure occurs.
-        continueAfterFailure = false
-
-        // In UI tests it’s important to set the initial state - such as interface orientation - required for your tests before they run. The setUp method is a good place to do this.
-    }
-
-    override func tearDownWithError() throws {
-        // Put teardown code here. This method is called after the invocation of each test method in the class.
-    }
-
-    func testExample() throws {
-        // UI tests must launch the application that they test.
-        let app = XCUIApplication()
-        app.launch()
-
-        // Use recording to get started writing UI tests.
-        // Use XCTAssert and related functions to verify your tests produce the correct results.
-    }
-
-    func testLaunchPerformance() throws {
-        if #available(macOS 10.15, iOS 13.0, tvOS 13.0, *) {
-            // This measures how long it takes to launch your application.
-            measure(metrics: [XCTApplicationLaunchMetric()]) {
-                XCUIApplication().launch()
-            }
-        }
-    }
-}

Tests macOS/Info.plist

@@ -1,22 +0,0 @@
-<?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>$(DEVELOPMENT_LANGUAGE)</string>
-	<key>CFBundleExecutable</key>
-	<string>$(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>1.0</string>
-	<key>CFBundleVersion</key>
-	<string>1</string>
-</dict>
-</plist>

Tests macOS/Tests_macOS.swift

@@ -1,37 +0,0 @@
-// Copyright © 2020 Metabolist. All rights reserved.
-
-import XCTest
-
-class Tests_macOS: XCTestCase {
-
-    override func setUpWithError() throws {
-        // Put setup code here. This method is called before the invocation of each test method in the class.
-
-        // In UI tests it is usually best to stop immediately when a failure occurs.
-        continueAfterFailure = false
-
-        // In UI tests it’s important to set the initial state - such as interface orientation - required for your tests before they run. The setUp method is a good place to do this.
-    }
-
-    override func tearDownWithError() throws {
-        // Put teardown code here. This method is called after the invocation of each test method in the class.
-    }
-
-    func testExample() throws {
-        // UI tests must launch the application that they test.
-        let app = XCUIApplication()
-        app.launch()
-
-        // Use recording to get started writing UI tests.
-        // Use XCTAssert and related functions to verify your tests produce the correct results.
-    }
-
-    func testLaunchPerformance() throws {
-        if #available(macOS 10.15, iOS 13.0, tvOS 13.0, *) {
-            // This measures how long it takes to launch your application.
-            measure(metrics: [XCTApplicationLaunchMetric()]) {
-                XCUIApplication().launch()
-            }
-        }
-    }
-}

Tests/View Models/AddIdentityViewModelTests.swift

@@ -0,0 +1,78 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import XCTest
+import Combine
+import CombineExpectations
+@testable import Metatext
+
+class AddIdentityViewModelTests: XCTestCase {
+    var networkClient: MastodonClient!
+    var identityDatabase: IdentityDatabase!
+    var secrets: Secrets!
+    var cancellables = Set<AnyCancellable>()
+
+    override func setUpWithError() throws {
+        networkClient = MastodonClient(configuration: .stubbing)
+        identityDatabase = try IdentityDatabase(inMemory: true)
+        secrets = Secrets(keychain: FakeKeychain())
+    }
+
+    func testAddIdentity() throws {
+        let sut = AddIdentityViewModel(
+            networkClient: networkClient,
+            identityDatabase: identityDatabase,
+            secrets: secrets,
+            webAuthenticationSessionType: SuccessfulStubbingWebAuthenticationSession.self)
+        let recorder = sut.addedIdentity.record()
+
+        sut.urlFieldText = "https://mastodon.social"
+        sut.goTapped()
+
+        let addedIdentity = try wait(for: recorder.next(), timeout: 1)
+
+        XCTAssertEqual(try identityDatabase.identity(id: addedIdentity.id), addedIdentity)
+        XCTAssertEqual(addedIdentity.url, URL(string: "https://mastodon.social")!)
+        XCTAssertEqual(
+            try secrets.item(.clientID, forIdentityID: addedIdentity.id) as String?,
+            "AUTHORIZATION_CLIENT_ID_STUB_VALUE")
+        XCTAssertEqual(
+            try secrets.item(.clientSecret, forIdentityID: addedIdentity.id) as String?,
+            "AUTHORIZATION_CLIENT_SECRET_STUB_VALUE")
+        XCTAssertEqual(
+            try secrets.item(.accessToken, forIdentityID: addedIdentity.id) as String?,
+            "ACCESS_TOKEN_STUB_VALUE")
+    }
+
+    func testAddIdentityWithoutScheme() throws {
+        let sut = AddIdentityViewModel(
+            networkClient: networkClient,
+            identityDatabase: identityDatabase,
+            secrets: secrets,
+            webAuthenticationSessionType: SuccessfulStubbingWebAuthenticationSession.self)
+        let recorder = sut.addedIdentity.record()
+
+        sut.urlFieldText = "mastodon.social"
+        sut.goTapped()
+
+        let addedIdentity = try wait(for: recorder.next(), timeout: 1)
+
+        XCTAssertEqual(try identityDatabase.identity(id: addedIdentity.id), addedIdentity)
+        XCTAssertEqual(addedIdentity.url, URL(string: "https://mastodon.social")!)
+    }
+
+    func testInvalidURL() throws {
+        let sut = AddIdentityViewModel(
+            networkClient: networkClient,
+            identityDatabase: identityDatabase,
+            secrets: secrets,
+            webAuthenticationSessionType: SuccessfulStubbingWebAuthenticationSession.self)
+        let recorder = sut.$alertItem.dropFirst().record()
+
+        sut.urlFieldText = "🐘.social"
+        sut.goTapped()
+
+        let alertItem = try wait(for: recorder.next(), timeout: 1)
+
+        XCTAssertEqual((alertItem?.error as? URLError)?.code, URLError.badURL)
+    }
+}

iOS/TabNavigation.swift

@@ -0,0 +1,43 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import SwiftUI
+
+struct TabNavigation: View {
+    @EnvironmentObject var sceneViewModel: SceneViewModel
+
+    var body: some View {
+        TabView(selection: $sceneViewModel.selectedTopLevelNavigation) {
+            ForEach(SceneViewModel.TopLevelNavigation.allCases) { topLevelNavigation in
+                NavigationView {
+                    view(topLevelNavigation: topLevelNavigation)
+                }
+                .tabItem {
+                    Label(topLevelNavigation.title, systemImage: topLevelNavigation.systemImageName)
+                        .accessibility(label: Text(topLevelNavigation.title))
+                }
+                .tag(topLevelNavigation)
+            }
+        }
+    }
+}
+
+private extension TabNavigation {
+    func view(topLevelNavigation: SceneViewModel.TopLevelNavigation) -> some View {
+        Group {
+            switch topLevelNavigation {
+            case .timelines:
+                TimelineView()
+                    .navigationBarTitle(sceneViewModel.identity?.handle ?? "", displayMode: .inline)
+            default: Text(topLevelNavigation.title)
+            }
+        }
+    }
+}
+
+// MARK: Preview
+
+struct TabNavigation_Previews: PreviewProvider {
+    static var previews: some View {
+        TabNavigation()
+    }
+}

macOS/SidebarNavigation.swift

@@ -0,0 +1,47 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import SwiftUI
+
+struct SidebarNavigation: View {
+    @EnvironmentObject var sceneViewModel: SceneViewModel
+
+    var sidebar: some View {
+        List(selection: $sceneViewModel.selectedTopLevelNavigation) {
+            ForEach(SceneViewModel.TopLevelNavigation.allCases) { topLevelNavigation in
+                NavigationLink(destination: view(topLevelNavigation: topLevelNavigation)) {
+                    Label(topLevelNavigation.title, systemImage: topLevelNavigation.systemImageName)
+                }
+                .accessibility(label: Text(topLevelNavigation.title))
+                .tag(topLevelNavigation)
+            }
+        }
+        .listStyle(SidebarListStyle())
+    }
+
+    var body: some View {
+        NavigationView {
+            sidebar
+                .frame(minWidth: 100, idealWidth: 150, maxWidth: 200, maxHeight: .infinity)
+        Text("Content")
+            .frame(maxWidth: .infinity, maxHeight: .infinity)
+        }
+    }
+}
+
+private extension SidebarNavigation {
+    func view(topLevelNavigation: SceneViewModel.TopLevelNavigation) -> some View {
+        Group {
+            switch topLevelNavigation {
+            case .timelines:
+                TimelineView()
+            default: Text(topLevelNavigation.title)
+            }
+        }
+    }
+}
+
+struct SidebarNavigation_Previews: PreviewProvider {
+    static var previews: some View {
+        SidebarNavigation()
+    }
+}

macOS/macOS.entitlements

@@ -6,5 +6,7 @@
 	<true/>
 	<key>com.apple.security.files.user-selected.read-only</key>
 	<true/>
+	<key>com.apple.security.network.client</key>
+	<true/>
 </dict>
 </plist>