178 lines
6.2 KiB
Swift
178 lines
6.2 KiB
Swift
//
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// Copyright 2022 New Vector Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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import SwiftUI
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struct LoginScreen: View {
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// MARK: - Properties
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// MARK: Private
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/// The focus state of the username text field.
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@FocusState private var isUsernameFocused: Bool
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/// The focus state of the password text field.
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@FocusState private var isPasswordFocused: Bool
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// MARK: Public
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@ObservedObject var context: LoginViewModel.Context
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var body: some View {
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ScrollView {
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VStack(spacing: 0) {
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header
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.padding(.top, UIConstants.topPaddingToNavigationBar)
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.padding(.bottom, 36)
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serverInfo
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.padding(.leading, 12)
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Rectangle()
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.fill(Color.element.quinaryContent)
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.frame(height: 1)
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.padding(.vertical, 21)
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switch context.viewState.loginMode {
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case .password:
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loginForm
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case .oidc:
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oidcButton
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default:
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loginUnavailableText
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}
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}
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.readableFrame()
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.padding(.horizontal, 16)
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.padding(.bottom, 16)
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}
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.background(Color.element.background.ignoresSafeArea())
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.alert(item: $context.alertInfo) { $0.alert }
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}
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/// The header containing a Welcome Back title.
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var header: some View {
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Text(ElementL10n.authenticationLoginTitle)
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.font(.element.title2B)
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.multilineTextAlignment(.center)
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.foregroundColor(.element.primaryContent)
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}
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/// The sever information section that includes a button to select a different server.
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var serverInfo: some View {
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LoginServerInfoSection(address: context.viewState.homeserver.address) {
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context.send(viewAction: .selectServer)
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}
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}
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/// The form with text fields for username and password, along with a submit button.
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var loginForm: some View {
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VStack(spacing: 14) {
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TextField(ElementL10n.loginSigninUsernameHint, text: $context.username)
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.focused($isUsernameFocused)
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.textFieldStyle(.elementInput())
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.disableAutocorrection(true)
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.textContentType(.username)
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.autocapitalization(.none)
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.submitLabel(.next)
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.onChange(of: isUsernameFocused, perform: usernameFocusChanged)
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.onSubmit { isPasswordFocused = true }
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.accessibilityIdentifier("usernameTextField")
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Spacer().frame(height: 20)
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SecureField(ElementL10n.loginSignupPasswordHint, text: $context.password)
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.focused($isPasswordFocused)
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.textFieldStyle(.elementInput())
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.textContentType(.password)
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.submitLabel(.done)
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.onSubmit(submit)
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.accessibilityIdentifier("passwordTextField")
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Button { context.send(viewAction: .forgotPassword) } label: {
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Text(ElementL10n.authenticationLoginForgotPassword)
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.font(.element.body)
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}
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.frame(maxWidth: .infinity, alignment: .trailing)
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.padding(.bottom, 8)
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Button(action: submit) {
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Text(ElementL10n.loginSignupSubmit)
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}
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.buttonStyle(.elementAction(.xLarge))
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.disabled(!context.viewState.canSubmit)
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.accessibilityIdentifier("nextButton")
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}
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}
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/// The OIDC button that can be used for login.
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var oidcButton: some View {
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Button { context.send(viewAction: .continueWithOIDC) } label: {
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Text(ElementL10n.loginContinue)
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}
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.buttonStyle(.elementAction(.xLarge))
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.accessibilityIdentifier("oidcButton")
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}
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/// Text shown if neither password or OIDC login is supported.
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var loginUnavailableText: some View {
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Text(ElementL10n.autodiscoverWellKnownError)
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.font(.body)
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.multilineTextAlignment(.center)
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.foregroundColor(.element.primaryContent)
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.frame(maxWidth: .infinity)
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.accessibilityIdentifier("unsupportedServerText")
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}
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/// Parses the username for a homeserver.
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private func usernameFocusChanged(isFocussed: Bool) {
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guard !isFocussed, !context.username.isEmpty else { return }
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context.send(viewAction: .parseUsername)
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}
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/// Sends the `next` view action so long as valid credentials have been input.
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private func submit() {
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guard context.viewState.canSubmit else { return }
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context.send(viewAction: .next)
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}
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}
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// MARK: - Previews
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struct Login_Previews: PreviewProvider {
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static let credentialsViewModel: LoginViewModel = {
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let viewModel = LoginViewModel(homeserver: .mockMatrixDotOrg)
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viewModel.context.username = "alice"
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viewModel.context.password = "password"
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return viewModel
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}()
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static var previews: some View {
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screen(for: LoginViewModel(homeserver: .mockMatrixDotOrg))
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screen(for: credentialsViewModel)
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screen(for: LoginViewModel(homeserver: .mockBasicServer))
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screen(for: LoginViewModel(homeserver: .mockOIDC))
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}
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static func screen(for viewModel: LoginViewModel) -> some View {
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NavigationView {
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LoginScreen(context: viewModel.context)
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.navigationBarTitleDisplayMode(.inline)
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.tint(.element.accent)
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}
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.navigationViewStyle(.stack)
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}
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}
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