252 lines
11 KiB
Swift
252 lines
11 KiB
Swift
//
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// MastodonRegisterViewModel.swift
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// Mastodon
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//
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// Created by MainasuK Cirno on 2021-2-5.
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//
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import Combine
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import Foundation
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import MastodonSDK
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import UIKit
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final class MastodonRegisterViewModel {
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var disposeBag = Set<AnyCancellable>()
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// input
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let domain: String
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let authenticateInfo: AuthenticationViewModel.AuthenticateInfo
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let instance: Mastodon.Entity.Instance
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let applicationToken: Mastodon.Entity.Token
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let context: AppContext
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let username = CurrentValueSubject<String, Never>("")
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let displayName = CurrentValueSubject<String, Never>("")
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let email = CurrentValueSubject<String, Never>("")
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let password = CurrentValueSubject<String, Never>("")
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let reason = CurrentValueSubject<String, Never>("")
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let avatarImage = CurrentValueSubject<UIImage?, Never>(nil)
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let usernameErrorPrompt = CurrentValueSubject<NSAttributedString?, Never>(nil)
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let emailErrorPrompt = CurrentValueSubject<NSAttributedString?, Never>(nil)
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let passwordErrorPrompt = CurrentValueSubject<NSAttributedString?, Never>(nil)
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let reasonErrorPrompt = CurrentValueSubject<NSAttributedString?, Never>(nil)
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// output
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let approvalRequired: Bool
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let applicationAuthorization: Mastodon.API.OAuth.Authorization
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let usernameValidateState = CurrentValueSubject<ValidateState, Never>(.empty)
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let displayNameValidateState = CurrentValueSubject<ValidateState, Never>(.empty)
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let emailValidateState = CurrentValueSubject<ValidateState, Never>(.empty)
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let passwordValidateState = CurrentValueSubject<ValidateState, Never>(.empty)
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let reasonValidateState = CurrentValueSubject<ValidateState, Never>(.empty)
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let isRegistering = CurrentValueSubject<Bool, Never>(false)
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let isAllValid = CurrentValueSubject<Bool, Never>(false)
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let error = CurrentValueSubject<Error?, Never>(nil)
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init(
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domain: String,
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context: AppContext,
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authenticateInfo: AuthenticationViewModel.AuthenticateInfo,
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instance: Mastodon.Entity.Instance,
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applicationToken: Mastodon.Entity.Token
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) {
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self.domain = domain
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self.context = context
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self.authenticateInfo = authenticateInfo
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self.instance = instance
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self.applicationToken = applicationToken
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self.approvalRequired = instance.approvalRequired ?? false
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self.applicationAuthorization = Mastodon.API.OAuth.Authorization(accessToken: applicationToken.accessToken)
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username
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.map { username in
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guard !username.isEmpty else { return .empty }
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var isValid = true
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// regex opt-out way to check validation
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// allowed:
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// a-z (isASCII && isLetter)
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// A-Z (isASCII && isLetter)
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// 0-9 (isASCII && isNumber)
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// _ ("_")
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for char in username {
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guard char.isASCII, char.isLetter || char.isNumber || char == "_" else {
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isValid = false
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break
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}
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}
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return isValid ? .valid : .invalid
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}
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.assign(to: \.value, on: usernameValidateState)
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.store(in: &disposeBag)
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username
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.filter { !$0.isEmpty }
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.debounce(for: .milliseconds(300), scheduler: DispatchQueue.main)
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.removeDuplicates()
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.compactMap { [weak self] text -> AnyPublisher<Result<Mastodon.Response.Content<Mastodon.Entity.Account>, Error>, Never>? in
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guard let self = self else { return nil }
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let query = Mastodon.API.Account.AccountLookupQuery(acct: text)
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return context.apiService.accountLookup(domain: domain, query: query, authorization: self.applicationAuthorization)
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.map {
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response -> Result<Mastodon.Response.Content<Mastodon.Entity.Account>, Error> in
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Result.success(response)
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}
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.catch { error in
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Just(Result.failure(error))
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}
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.eraseToAnyPublisher()
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}
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.switchToLatest()
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.sink { [weak self] result in
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guard let self = self else { return }
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switch result {
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case .success:
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let text = L10n.Scene.Register.Error.Reason.taken(L10n.Scene.Register.Error.Item.username)
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self.usernameErrorPrompt.value = MastodonRegisterViewModel.errorPromptAttributedString(for: text)
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case .failure:
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break
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}
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}
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.store(in: &disposeBag)
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usernameValidateState
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.sink { [weak self] validateState in
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if validateState == .valid {
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self?.usernameErrorPrompt.value = nil
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}
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}
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.store(in: &disposeBag)
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displayName
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.map { displayname in
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guard !displayname.isEmpty else { return .empty }
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return .valid
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}
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.assign(to: \.value, on: displayNameValidateState)
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.store(in: &disposeBag)
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email
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.map { email in
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guard !email.isEmpty else { return .empty }
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return MastodonRegisterViewModel.isValidEmail(email) ? .valid : .invalid
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}
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.assign(to: \.value, on: emailValidateState)
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.store(in: &disposeBag)
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password
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.map { password in
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guard !password.isEmpty else { return .empty }
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return password.count >= 8 ? .valid : .invalid
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}
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.assign(to: \.value, on: passwordValidateState)
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.store(in: &disposeBag)
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if approvalRequired {
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reason
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.map { invite in
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guard !invite.isEmpty else { return .empty }
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return .valid
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}
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.assign(to: \.value, on: reasonValidateState)
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.store(in: &disposeBag)
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}
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error
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.sink { [weak self] error in
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guard let self = self else { return }
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let error = error as? Mastodon.API.Error
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let mastodonError = error?.mastodonError
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if case let .generic(genericMastodonError) = mastodonError,
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let details = genericMastodonError.details
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{
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self.usernameErrorPrompt.value = details.usernameErrorDescriptions.first.flatMap { MastodonRegisterViewModel.errorPromptAttributedString(for: $0) }
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self.emailErrorPrompt.value = details.emailErrorDescriptions.first.flatMap { MastodonRegisterViewModel.errorPromptAttributedString(for: $0) }
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self.passwordErrorPrompt.value = details.passwordErrorDescriptions.first.flatMap { MastodonRegisterViewModel.errorPromptAttributedString(for: $0) }
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self.reasonErrorPrompt.value = details.reasonErrorDescriptions.first.flatMap { MastodonRegisterViewModel.errorPromptAttributedString(for: $0) }
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} else {
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self.usernameErrorPrompt.value = nil
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self.emailErrorPrompt.value = nil
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self.passwordErrorPrompt.value = nil
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self.reasonErrorPrompt.value = nil
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}
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}
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.store(in: &disposeBag)
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let publisherOne = Publishers.CombineLatest4(
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usernameValidateState.eraseToAnyPublisher(),
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displayNameValidateState.eraseToAnyPublisher(),
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emailValidateState.eraseToAnyPublisher(),
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passwordValidateState.eraseToAnyPublisher()
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)
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.map { $0.0 == .valid && $0.1 == .valid && $0.2 == .valid && $0.3 == .valid }
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Publishers.CombineLatest(
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publisherOne,
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approvalRequired ? reasonValidateState.map { $0 == .valid }.eraseToAnyPublisher() : Just(true).eraseToAnyPublisher()
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)
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.map { $0 && $1 }
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.assign(to: \.value, on: isAllValid)
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.store(in: &disposeBag)
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}
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}
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extension MastodonRegisterViewModel {
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enum ValidateState {
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case empty
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case invalid
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case valid
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}
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}
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extension MastodonRegisterViewModel {
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static func isValidEmail(_ email: String) -> Bool {
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let emailRegEx = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,64}"
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let emailPred = NSPredicate(format: "SELF MATCHES %@", emailRegEx)
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return emailPred.evaluate(with: email)
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}
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static func checkmarkImage(font: UIFont = .preferredFont(forTextStyle: .caption1)) -> UIImage {
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let configuration = UIImage.SymbolConfiguration(font: font)
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return UIImage(systemName: "checkmark.circle.fill", withConfiguration: configuration)!
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}
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static func xmarkImage(font: UIFont = .preferredFont(forTextStyle: .caption1)) -> UIImage {
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let configuration = UIImage.SymbolConfiguration(font: font)
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return UIImage(systemName: "xmark.octagon.fill", withConfiguration: configuration)!
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}
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static func attributedStringImage(with image: UIImage, tintColor: UIColor) -> NSAttributedString {
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let attachment = NSTextAttachment()
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attachment.image = image.withTintColor(tintColor)
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return NSAttributedString(attachment: attachment)
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}
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static func attributeStringForPassword(validateState: ValidateState) -> NSAttributedString {
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let font = UIFontMetrics(forTextStyle: .caption1).scaledFont(for: .systemFont(ofSize: 13, weight: .regular), maximumPointSize: 18)
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let attributeString = NSMutableAttributedString()
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let image = MastodonRegisterViewModel.checkmarkImage(font: font)
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attributeString.append(attributedStringImage(with: image, tintColor: validateState == .valid ? Asset.Colors.Label.primary.color : .clear))
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attributeString.append(NSAttributedString(string: " "))
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let eightCharactersDescription = NSAttributedString(string: L10n.Scene.Register.Input.Password.hint, attributes: [NSAttributedString.Key.font: font, NSAttributedString.Key.foregroundColor: Asset.Colors.Label.primary.color])
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attributeString.append(eightCharactersDescription)
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return attributeString
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}
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static func errorPromptAttributedString(for prompt: String) -> NSAttributedString {
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let font = UIFontMetrics(forTextStyle: .caption1).scaledFont(for: .systemFont(ofSize: 13, weight: .regular), maximumPointSize: 18)
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let attributeString = NSMutableAttributedString()
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let image = MastodonRegisterViewModel.xmarkImage(font: font)
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attributeString.append(attributedStringImage(with: image, tintColor: Asset.Colors.danger.color))
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attributeString.append(NSAttributedString(string: " "))
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let promptAttributedString = NSAttributedString(string: prompt, attributes: [NSAttributedString.Key.font: font, NSAttributedString.Key.foregroundColor: Asset.Colors.danger.color])
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attributeString.append(promptAttributedString)
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return attributeString
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}
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}
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