Registrations wip

Localizations/Localizable.strings

@@ -5,7 +5,19 @@
 "add-identity.instance-url" = "Instance URL";
 "add-identity.log-in" = "Log in";
 "add-identity.browse" = "Browse";
+"add-identity.join" = "Join";
+"add-identity.request-invite" = "Request an invite";
 "add-identity.unable-to-connect-to-instance" = "Unable to connect to instance";
+"registration.review-terms-of-use-and-privacy-policy-%@" = "Please review %@'s Terms of Use and Privacy Policy to continue";
+"registration.username" = "Username";
+"registration.email" = "Email";
+"registration.password" = "Password";
+"registration.password-confirmation" = "Confirm password";
+"registration.reason-%@" = "Why do you want to join %@?";
+"registration.server-rules" = "Server rules";
+"registration.terms-of-service" = "Terms of service";
+"registration.agree-to-server-rules-and-terms-of-service" = "I agree to the server rules and terms of service";
+"registration.password-confirmation-mismatch" = "Password and password confirmation do not match";
 "secondary-navigation.manage-accounts" = "Manage Accounts";
 "secondary-navigation.lists" = "Lists";
 "secondary-navigation.preferences" = "Preferences";

MastodonAPI/Sources/MastodonAPI/Endpoints/AccessTokenEndpoint.swift

@@ -6,41 +6,67 @@ import Mastodon
 
 public enum AccessTokenEndpoint {
     case oauthToken(
-        clientID: String,
+            clientID: String,
-        clientSecret: String,
+            clientSecret: String,
-        code: String,
+            grantType: String,
-        grantType: String,
+            scopes: String,
-        scopes: String,
+            code: String?,
-        redirectURI: String
+            redirectURI: String?
-    )
+         )
+    case accounts(username: String, email: String, password: String, reason: String?)
 }
 
 extension AccessTokenEndpoint: Endpoint {
     public typealias ResultType = AccessToken
 
-    public var context: [String] { [] }
+    public var context: [String] {
+        switch self {
+        case .oauthToken:
+            return []
+        case .accounts:
+            return defaultContext
+        }
+    }
 
     public var pathComponentsInContext: [String] {
-        ["oauth", "token"]
+        switch self {
+        case .oauthToken:
+            return ["oauth", "token"]
+        case .accounts:
+            return ["accounts"]
+        }
     }
 
     public var method: HTTPMethod {
         switch self {
-        case .oauthToken: return .post
+        case .oauthToken, .accounts: return .post
         }
     }
 
     public var parameters: [String: Any]? {
         switch self {
-        case let .oauthToken(clientID, clientSecret, code, grantType, scopes, redirectURI):
+        case let .oauthToken(clientID, clientSecret, grantType, scopes, code, redirectURI):
-            return [
+            var params = [
                 "client_id": clientID,
                 "client_secret": clientSecret,
-                "code": code,
                 "grant_type": grantType,
-                "scope": scopes,
+                "scope": scopes]
-                "redirect_uri": redirectURI
+
-            ]
+            params["code"] = code
+            params["redirect_uri"] = redirectURI
+
+            return params
+        case let .accounts(username, email, password, reason):
+            var params: [String: Any] = [
+                "username": username,
+                "email": email,
+                "password": password,
+                "locale": Locale.autoupdatingCurrent.languageCode ?? "en", // TODO: probably need to map
+                "agreement": true]
+
+            params["reason"] = reason
+
+            return params
         }
     }
 }

MastodonAPI/Sources/MastodonAPIStubs/AccessTokenEndpoint+Stubbing.swift

@@ -6,16 +6,13 @@ import Stubbing
 
 extension AccessTokenEndpoint: Stubbing {
     public func dataString(url: URL) -> String? {
-        switch self {
+        """
-        case let .oauthToken(_, _, _, _, scopes, _):
+        {
-            return """
+          "access_token": "ACCESS_TOKEN_STUB_VALUE",
-            {
+          "token_type": "Bearer",
-              "access_token": "ACCESS_TOKEN_STUB_VALUE",
+          "scope": "ACCESS_TOKEN_STUB_VALUE_SCOPES",
-              "token_type": "Bearer",
+          "created_at": "\(Int(Date().timeIntervalSince1970))"
-              "scope": "\(scopes)",
-              "created_at": "\(Int(Date().timeIntervalSince1970))"
-            }
-            """
         }
+        """
     }
 }

Metatext.xcodeproj/project.pbxproj

@@ -11,7 +11,9 @@
 		D01F41D824F880C400D55A2D /* StatusTableViewCell.swift in Sources */ = {isa = PBXBuildFile; fileRef = D01F41D524F880C400D55A2D /* StatusTableViewCell.swift */; };
 		D01F41D924F880C400D55A2D /* TouchFallthroughTextView.swift in Sources */ = {isa = PBXBuildFile; fileRef = D01F41D624F880C400D55A2D /* TouchFallthroughTextView.swift */; };
 		D01F41E424F8889700D55A2D /* AttachmentsView.swift in Sources */ = {isa = PBXBuildFile; fileRef = D01F41E224F8889700D55A2D /* AttachmentsView.swift */; };
+		D02E1F95250B13210071AD56 /* SafariView.swift in Sources */ = {isa = PBXBuildFile; fileRef = D02E1F94250B13210071AD56 /* SafariView.swift */; };
 		D06B492324D4611300642749 /* KingfisherSwiftUI in Frameworks */ = {isa = PBXBuildFile; productRef = D06B492224D4611300642749 /* KingfisherSwiftUI */; };
+		D0B32F50250B373600311912 /* RegistrationView.swift in Sources */ = {isa = PBXBuildFile; fileRef = D0B32F4F250B373600311912 /* RegistrationView.swift */; };
 		D0BEB1F324F8EE8C001B0F04 /* AttachmentView.swift in Sources */ = {isa = PBXBuildFile; fileRef = D0BEB1F224F8EE8C001B0F04 /* AttachmentView.swift */; };
 		D0BEB1F724F9A84B001B0F04 /* LoadingTableFooterView.swift in Sources */ = {isa = PBXBuildFile; fileRef = D0BEB1F624F9A84B001B0F04 /* LoadingTableFooterView.swift */; };
 		D0BEB1FF24F9E5BB001B0F04 /* ListsView.swift in Sources */ = {isa = PBXBuildFile; fileRef = D0BEB1FE24F9E5BB001B0F04 /* ListsView.swift */; };
@@ -82,11 +84,13 @@
 		D01F41D524F880C400D55A2D /* StatusTableViewCell.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = StatusTableViewCell.swift; sourceTree = "<group>"; };
 		D01F41D624F880C400D55A2D /* TouchFallthroughTextView.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = TouchFallthroughTextView.swift; sourceTree = "<group>"; };
 		D01F41E224F8889700D55A2D /* AttachmentsView.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = AttachmentsView.swift; sourceTree = "<group>"; };
+		D02E1F94250B13210071AD56 /* SafariView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SafariView.swift; sourceTree = "<group>"; };
 		D047FA8C24C3E21200AF17C5 /* Metatext.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = Metatext.app; sourceTree = BUILT_PRODUCTS_DIR; };
 		D0666A2124C677B400F3F04B /* Tests.xctest */ = {isa = PBXFileReference; explicitFileType = wrapper.cfbundle; includeInIndex = 0; path = Tests.xctest; sourceTree = BUILT_PRODUCTS_DIR; };
 		D0666A2524C677B400F3F04B /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
 		D085C3BB25008DEC008A6C5E /* DB */ = {isa = PBXFileReference; lastKnownFileType = folder; path = DB; sourceTree = "<group>"; };
 		D0AD03552505814D0085A466 /* Base16 */ = {isa = PBXFileReference; lastKnownFileType = folder; path = Base16; sourceTree = "<group>"; };
+		D0B32F4F250B373600311912 /* RegistrationView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = RegistrationView.swift; sourceTree = "<group>"; };
 		D0BDF66524FD7A6400C7FA1C /* ServiceLayer */ = {isa = PBXFileReference; lastKnownFileType = folder; path = ServiceLayer; sourceTree = "<group>"; };
 		D0BEB1F224F8EE8C001B0F04 /* AttachmentView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AttachmentView.swift; sourceTree = "<group>"; };
 		D0BEB1F624F9A84B001B0F04 /* LoadingTableFooterView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LoadingTableFooterView.swift; sourceTree = "<group>"; };
@@ -253,7 +257,9 @@
 				D0C7D42D24F76169001EBDBB /* NotificationTypesPreferencesView.swift */,
 				D0C7D42824F76169001EBDBB /* PostingReadingPreferencesView.swift */,
 				D0C7D42624F76169001EBDBB /* PreferencesView.swift */,
+				D0B32F4F250B373600311912 /* RegistrationView.swift */,
 				D0C7D42724F76169001EBDBB /* RootView.swift */,
+				D02E1F94250B13210071AD56 /* SafariView.swift */,
 				D0C7D42924F76169001EBDBB /* SecondaryNavigationView.swift */,
 				D01F41D324F8807E00D55A2D /* Status Cell */,
 				D0C7D42524F76169001EBDBB /* StatusListView.swift */,
@@ -479,7 +485,9 @@
 			buildActionMask = 2147483647;
 			files = (
 				D0C7D4A324F7616A001EBDBB /* TabNavigationView.swift in Sources */,
+				D02E1F95250B13210071AD56 /* SafariView.swift in Sources */,
 				D0C7D49C24F7616A001EBDBB /* RootView.swift in Sources */,
+				D0B32F50250B373600311912 /* RegistrationView.swift in Sources */,
 				D0BEB1F324F8EE8C001B0F04 /* AttachmentView.swift in Sources */,
 				D0C7D49A24F7616A001EBDBB /* StatusListView.swift in Sources */,
 				D01F41D924F880C400D55A2D /* TouchFallthroughTextView.swift in Sources */,

ServiceLayer/Sources/ServiceLayer/Services/AllIdentitiesService.swift

@@ -29,33 +29,26 @@ public extension AllIdentitiesService {
     }
 
     func createIdentity(id: UUID, url: URL, authenticated: Bool) -> AnyPublisher<Never, Error> {
-        let secrets = Secrets(identityID: id, keychain: environment.keychain)
+        createIdentity(
-
-        do {
-            try secrets.setInstanceURL(url)
-        } catch {
-            return Fail(error: error).eraseToAnyPublisher()
-        }
-
-        let createIdentityPublisher = database.createIdentity(
             id: id,
             url: url,
-            authenticated: authenticated)
+            authenticationPublisher: authenticated
-            .ignoreOutput()
+                ? AuthenticationService(url: url, environment: environment).authenticate()
-            .eraseToAnyPublisher()
+                : nil)
+    }
 
-        if authenticated {
+    func createIdentity(
-            return AuthenticationService(url: url, environment: environment).authenticate()
+        id: UUID,
-                .tryMap {
+        url: URL,
-                    try secrets.setClientID($0.clientId)
+        username: String,
-                    try secrets.setClientSecret($0.clientSecret)
+        email: String,
-                    try secrets.setAccessToken($1.accessToken)
+        password: String,
-                }
+        reason: String?) -> AnyPublisher<Never, Error> {
-                .flatMap { createIdentityPublisher }
+        createIdentity(
-                .eraseToAnyPublisher()
+            id: id,
-        } else {
+            url: url,
-            return createIdentityPublisher
+            authenticationPublisher: AuthenticationService(url: url, environment: environment)
-        }
+                .register(username: username, email: email, password: password, reason: reason))
     }
 
     func deleteIdentity(id: UUID) -> AnyPublisher<Never, Error> {
@@ -101,3 +94,38 @@ public extension AllIdentitiesService {
             .eraseToAnyPublisher()
     }
 }
+
+private extension AllIdentitiesService {
+    func createIdentity(
+        id: UUID,
+        url: URL,
+        authenticationPublisher: AnyPublisher<(AppAuthorization, AccessToken), Error>?) -> AnyPublisher<Never, Error> {
+        let secrets = Secrets(identityID: id, keychain: environment.keychain)
+
+        do {
+            try secrets.setInstanceURL(url)
+        } catch {
+            return Fail(error: error).eraseToAnyPublisher()
+        }
+
+        let createIdentityPublisher = database.createIdentity(
+            id: id,
+            url: url,
+            authenticated: authenticationPublisher != nil)
+            .ignoreOutput()
+            .eraseToAnyPublisher()
+
+        if let authenticationPublisher = authenticationPublisher {
+            return authenticationPublisher
+                .tryMap {
+                    try secrets.setClientID($0.clientId)
+                    try secrets.setClientSecret($0.clientSecret)
+                    try secrets.setAccessToken($1.accessToken)
+                }
+                .flatMap { createIdentityPublisher }
+                .eraseToAnyPublisher()
+        } else {
+            return createIdentityPublisher
+        }
+    }
+}

ServiceLayer/Sources/ServiceLayer/Services/AuthenticationService.swift

@@ -22,16 +22,42 @@ struct AuthenticationService {
 
 extension AuthenticationService {
     func authenticate() -> AnyPublisher<(AppAuthorization, AccessToken), Error> {
-        let appAuthorization = mastodonAPIClient.request(
+        let authorization = appAuthorization().share()
-            AppAuthorizationEndpoint.apps(
+
-                clientName: OAuth.clientName,
+        return authorization
-                redirectURI: OAuth.callbackURL.absoluteString,
+            .zip(authorization.flatMap(authenticate(appAuthorization:)))
-                scopes: OAuth.scopes,
+            .eraseToAnyPublisher()
-                website: OAuth.website))
+    }
+
+    func register(username: String,
+                  email: String,
+                  password: String,
+                  reason: String?) -> AnyPublisher<(AppAuthorization, AccessToken), Error> {
+        let authorization = appAuthorization()
             .share()
 
-        return appAuthorization
+        return authorization.zip(
-            .zip(appAuthorization.flatMap(authenticate(appAuthorization:)))
+            authorization.flatMap { appAuthorization -> AnyPublisher<AccessToken, Error> in
+                mastodonAPIClient.request(
+                    AccessTokenEndpoint.oauthToken(
+                        clientID: appAuthorization.clientId,
+                        clientSecret: appAuthorization.clientSecret,
+                        grantType: OAuth.registrationGrantType,
+                        scopes: OAuth.scopes,
+                        code: nil,
+                        redirectURI: OAuth.callbackURL.absoluteString))
+                    .flatMap { accessToken -> AnyPublisher<AccessToken, Error> in
+                        mastodonAPIClient.accessToken = accessToken.accessToken
+
+                        return mastodonAPIClient.request(
+                            AccessTokenEndpoint.accounts(
+                                username: username,
+                                email: email,
+                                password: password,
+                                reason: reason))
+                    }
+                    .eraseToAnyPublisher()
+            })
             .eraseToAnyPublisher()
     }
 }
@@ -41,7 +67,8 @@ private extension AuthenticationService {
         static let clientName = "Metatext"
         static let scopes = "read write follow push"
         static let codeCallbackQueryItemName = "code"
-        static let grantType = "authorization_code"
+        static let authorizationCodeGrantType = "authorization_code"
+        static let registrationGrantType = "client_credentials"
         static let callbackURLScheme = "metatext"
         static let callbackURL = URL(string: "\(callbackURLScheme)://oauth.callback")!
         static let website = URL(string: "https://metabolist.com/metatext")!
@@ -63,6 +90,15 @@ private extension AuthenticationService {
         return code
     }
 
+    func appAuthorization() -> AnyPublisher<AppAuthorization, Error> {
+        mastodonAPIClient.request(
+            AppAuthorizationEndpoint.apps(
+                clientName: OAuth.clientName,
+                redirectURI: OAuth.callbackURL.absoluteString,
+                scopes: OAuth.scopes,
+                website: OAuth.website))
+    }
+
     func authorizationURL(appAuthorization: AppAuthorization) throws -> URL {
         guard var authorizationURLComponents = URLComponents(
                 url: mastodonAPIClient.instanceURL,
@@ -106,9 +142,9 @@ private extension AuthenticationService {
                     AccessTokenEndpoint.oauthToken(
                         clientID: appAuthorization.clientId,
                         clientSecret: appAuthorization.clientSecret,
-                        code: $0,
+                        grantType: OAuth.authorizationCodeGrantType,
-                        grantType: OAuth.grantType,
                         scopes: OAuth.scopes,
+                        code: $0,
                         redirectURI: OAuth.callbackURL.absoluteString))
             }
             .eraseToAnyPublisher()

ViewModels/Sources/PreviewViewModels/PreviewViewModels.swift

@@ -15,25 +15,21 @@ import ViewModels
 
 let db: IdentityDatabase = {
     let id = UUID()
-    let url = URL(string: "https://mastodon.social")!
     let db = try! IdentityDatabase(inMemory: true, keychain: MockKeychain.self)
-    let decoder = MastodonDecoder()
-    let instance = try! decoder.decode(Instance.self, from: StubData.instance)
-    let account = try! decoder.decode(Account.self, from: StubData.account)
     let secrets = Secrets(identityID: id, keychain: MockKeychain.self)
 
-    try! secrets.setInstanceURL(url)
+    try! secrets.setInstanceURL(.previewInstanceURL)
     try! secrets.setAccessToken(UUID().uuidString)
 
-    _ = db.createIdentity(id: id, url: url, authenticated: true)
+    _ = db.createIdentity(id: id, url: .previewInstanceURL, authenticated: true)
             .receive(on: ImmediateScheduler.shared)
             .sink { _ in } receiveValue: { _ in }
 
-    _ = db.updateInstance(instance, forIdentityID: id)
+    _ = db.updateInstance(.preview, forIdentityID: id)
         .receive(on: ImmediateScheduler.shared)
         .sink { _ in } receiveValue: { _ in }
 
-    _ = db.updateAccount(account, forIdentityID: id)
+    _ = db.updateAccount(.preview, forIdentityID: id)
         .receive(on: ImmediateScheduler.shared)
         .sink { _ in } receiveValue: { _ in }
 
@@ -41,6 +37,19 @@ let db: IdentityDatabase = {
 }()
 
 let environment = AppEnvironment.mock(fixtureDatabase: db)
+let decoder = MastodonDecoder()
+
+public extension URL {
+    static let previewInstanceURL = URL(string: "https://mastodon.social")!
+}
+
+public extension Account {
+    static let preview = try! decoder.decode(Account.self, from: StubData.account)
+}
+
+public extension Instance {
+    static let preview = try! decoder.decode(Instance.self, from: StubData.instance)
+}
 
 public extension RootViewModel {
     static let preview = try! RootViewModel(environment: environment) { Empty().eraseToAnyPublisher() }

ViewModels/Sources/ViewModels/AddIdentityViewModel.swift

@@ -13,7 +13,7 @@ public final class AddIdentityViewModel: ObservableObject {
     @Published public var urlFieldText = ""
     @Published public var alertItem: AlertItem?
     @Published public private(set) var loading = false
-    @Published public private(set) var instance: Instance?
+    @Published public private(set) var instanceAndURL: (Instance, URL)?
     @Published public private(set) var isPublicTimelineAvailable = false
     public let addedIdentityID: AnyPublisher<UUID, Never>
 
@@ -32,18 +32,23 @@ public final class AddIdentityViewModel: ObservableObject {
             .removeDuplicates()
             .map(instanceURLService.url(text:))
             .share()
-        let urlPresent =  url.map { $0 != nil }.share()
 
         url.compactMap { $0 }
             .flatMap(instanceURLService.instance(url:))
-            .combineLatest(urlPresent)
+            .combineLatest(url)
-            .map { $1 ? $0 : nil }
+            .map {
+                if let instance = $0, let url = $1 {
+                    return (instance, url)
+                }
+
+                return nil
+            }
             .receive(on: DispatchQueue.main)
-            .assign(to: &$instance)
+            .assign(to: &$instanceAndURL)
 
         url.compactMap { $0 }
             .flatMap(instanceURLService.isPublicTimelineAvailable(url:))
-            .combineLatest(urlPresent)
+            .combineLatest(url.map { $0 != nil })
             .map { $0 && $1 }
             .receive(on: DispatchQueue.main)
             .assign(to: &$isPublicTimelineAvailable)
@@ -64,6 +69,10 @@ public extension AddIdentityViewModel {
             .sink { _ in }
             .store(in: &cancellables)
     }
+
+    func registrationViewModel(instance: Instance, url: URL) -> RegistrationViewModel {
+        RegistrationViewModel(instance: instance, url: url, allIdentitiesService: allIdentitiesService)
+    }
 }
 
 private extension AddIdentityViewModel {

ViewModels/Sources/ViewModels/RegistrationViewModel.swift

@@ -0,0 +1,82 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import Combine
+import Foundation
+import Mastodon
+import MastodonAPI
+import ServiceLayer
+
+public enum RegistrationError: Error {
+    case passwordConfirmationMismatch
+}
+
+public final class RegistrationViewModel: ObservableObject {
+    public let instance: Instance
+    public let serverRulesURL: URL
+    public let termsOfServiceURL: URL
+    @Published public var alertItem: AlertItem?
+    @Published public var username = ""
+    @Published public var email = ""
+    @Published public var password = ""
+    @Published public var passwordConfirmation = ""
+    @Published public var reason = ""
+    @Published public var passwordsMatch = false
+    @Published public var agreement = false
+    @Published public private(set) var registerButtonEnabled = false
+    @Published public private(set) var registering = false
+
+    private let url: URL
+    private let allIdentitiesService: AllIdentitiesService
+    private var cancellables = Set<AnyCancellable>()
+
+    init(instance: Instance, url: URL, allIdentitiesService: AllIdentitiesService) {
+        self.instance = instance
+        self.url = url
+        self.serverRulesURL = url.appendingPathComponent("about").appendingPathComponent("more")
+        self.termsOfServiceURL = url.appendingPathComponent("terms")
+        self.allIdentitiesService = allIdentitiesService
+
+        Publishers.CombineLatest4($username, $email, $password, $reason)
+            .map { username, email, password, reason in
+                !username.isEmpty
+                    && !email.isEmpty
+                    && !password.isEmpty
+                    && (!instance.approvalRequired || !reason.isEmpty)
+            }
+            .combineLatest($agreement)
+            .map { $0 && $1 }
+            .assign(to: &$registerButtonEnabled)
+    }
+}
+
+public extension RegistrationViewModel {
+    func registerTapped() {
+        guard password == passwordConfirmation else {
+            alertItem = AlertItem(error: RegistrationError.passwordConfirmationMismatch)
+
+            return
+        }
+
+        allIdentitiesService.createIdentity(
+            id: UUID(),
+            url: url,
+            username: username,
+            email: email,
+            password: password,
+            reason: reason)
+            .handleEvents(receiveSubscription: { [weak self] _ in self?.registering = true })
+            .mapError { error -> Error in
+                if error is URLError {
+                    return AddIdentityError.unableToConnectToInstance
+                } else {
+                    return error
+                }
+            }
+            .receive(on: DispatchQueue.main)
+            .assignErrorsToAlertItem(to: \.alertItem, on: self)
+            .sink { [weak self] _ in
+                self?.registering = false
+            } receiveValue: { _ in }
+            .store(in: &cancellables)
+    }
+}

Views/AddIdentityView.swift

@@ -7,6 +7,7 @@ import ViewModels
 struct AddIdentityView: View {
     @StateObject var viewModel: AddIdentityViewModel
     @EnvironmentObject var rootViewModel: RootViewModel
+    @State private var navigateToRegister = false
 
     var body: some View {
         Form {
@@ -15,7 +16,7 @@ struct AddIdentityView: View {
                     .autocapitalization(.none)
                     .disableAutocorrection(true)
                     .keyboardType(.URL)
-                if let instance = viewModel.instance {
+                if let (instance, _) = viewModel.instanceAndURL {
                     VStack(alignment: .center) {
                         KFImage(instance.thumbnail)
                             .placeholder {
@@ -41,6 +42,25 @@ struct AddIdentityView: View {
                     } else {
                         Button("add-identity.log-in",
                                action: viewModel.logInTapped)
+                        if let (instance, url) = viewModel.instanceAndURL,
+                           instance.registrations {
+                            ZStack {
+                                NavigationLink(
+                                    destination: RegistrationView(
+                                        viewModel: viewModel.registrationViewModel(
+                                            instance: instance,
+                                            url: url)),
+                                    isActive: $navigateToRegister) {
+                                        EmptyView()
+                                    }
+                                .hidden()
+                                Button(instance.approvalRequired
+                                        ? "add-identity.request-invite"
+                                        : "add-identity.join") {
+                                    navigateToRegister.toggle()
+                                }
+                            }
+                        }
                         if viewModel.isPublicTimelineAvailable {
                             Button("add-identity.browse", action: viewModel.browseTapped)
                         }
@@ -71,7 +91,10 @@ import PreviewViewModels
 
 struct AddAccountView_Previews: PreviewProvider {
     static var previews: some View {
-        AddIdentityView(viewModel: RootViewModel.preview.addIdentityViewModel())
+        NavigationView {
+            AddIdentityView(viewModel: RootViewModel.preview.addIdentityViewModel())
+                .navigationBarTitleDisplayMode(.inline)
+        }
     }
 }
 #endif

Views/RegistrationView.swift

@@ -0,0 +1,103 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import SwiftUI
+import ViewModels
+
+struct RegistrationView: View {
+    @StateObject var viewModel: RegistrationViewModel
+
+    @State private var presentWebView = false
+    @State private var toReview = ToReview.serverRules
+
+    var body: some View {
+        Form {
+            Section {
+                HStack {
+                    TextField("registration.username", text: $viewModel.username)
+                        .autocapitalization(.none)
+                        .disableAutocorrection(true)
+                    Text("@" + viewModel.instance.uri)
+                        .foregroundColor(.secondary)
+                }
+                TextField("registration.email", text: $viewModel.email)
+                    .autocapitalization(.none)
+                    .disableAutocorrection(true)
+                    .keyboardType(.emailAddress)
+                SecureField("registration.password", text: $viewModel.password)
+                SecureField("registration.password-confirmation", text: $viewModel.passwordConfirmation)
+                if viewModel.instance.approvalRequired {
+                    VStack(alignment: .leading) {
+                        Text("registration.reason-\(viewModel.instance.uri)")
+                        TextEditor(text: $viewModel.reason)
+                    }
+                }
+                Button("registration.server-rules") {
+                    toReview = .serverRules
+                    presentWebView = true
+                }
+                Button("registration.terms-of-service") {
+                    toReview = .termsOfService
+                    presentWebView = true
+                }
+                Toggle("registration.agree-to-server-rules-and-terms-of-service",
+                       isOn: $viewModel.agreement)
+            }
+            Section {
+                Group {
+                    if viewModel.registering {
+                        ProgressView()
+                    } else {
+                        Button(viewModel.instance.approvalRequired
+                                ? "add-identity.request-invite"
+                                : "add-identity.join",
+                               action: viewModel.registerTapped)
+                            .disabled(!viewModel.registerButtonEnabled)
+                    }
+                }
+                .frame(maxWidth: .infinity, alignment: .center)
+            }
+        }
+        .alertItem($viewModel.alertItem)
+        .sheet(isPresented: $presentWebView) { () -> SafariView in
+            let url: URL
+
+            switch toReview {
+            case .serverRules: url = viewModel.serverRulesURL
+            case .termsOfService: url = viewModel.termsOfServiceURL
+            }
+
+            return SafariView(url: url)
+        }
+    }
+}
+
+private extension RegistrationView {
+    enum ToReview {
+        case serverRules
+        case termsOfService
+    }
+}
+
+extension RegistrationError: LocalizedError {
+    public var errorDescription: String? {
+        switch self {
+        case .passwordConfirmationMismatch:
+            return NSLocalizedString(
+                "registration.password-confirmation-mismatch",
+                comment: "")
+        }
+    }
+}
+
+#if DEBUG
+import PreviewViewModels
+
+struct RegistrationView_Previews: PreviewProvider {
+    static var previews: some View {
+        RegistrationView(viewModel: RootViewModel.preview
+                            .addIdentityViewModel()
+                            .registrationViewModel(instance: .preview,
+                                                   url: .previewInstanceURL))
+    }
+}
+#endif

Views/RootView.swift

@@ -13,9 +13,13 @@ struct RootView: View {
                 .environmentObject(viewModel)
                 .transition(.opacity)
         } else {
-            AddIdentityView(viewModel: viewModel.addIdentityViewModel())
+            NavigationView {
-                .environmentObject(viewModel)
+                AddIdentityView(viewModel: viewModel.addIdentityViewModel())
-                .transition(.opacity)
+                    .navigationBarTitleDisplayMode(.inline)
+                    .navigationBarHidden(true)
+            }
+            .environmentObject(viewModel)
+            .transition(.opacity)
         }
     }
 }

Views/SafariView.swift

@@ -0,0 +1,16 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import SafariServices
+import SwiftUI
+
+struct SafariView: UIViewControllerRepresentable {
+    let url: URL
+
+    func makeUIViewController(context: Context) -> SFSafariViewController {
+        SFSafariViewController(url: url)
+    }
+
+    func updateUIViewController(_ uiViewController: SFSafariViewController, context: Context) {
+
+    }
+}