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WriteFreelyModel.swift
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WriteFreelyModel.swift
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import Foundation
import WriteFreely
import Security
// MARK: - WriteFreelyModel
class WriteFreelyModel: ObservableObject {
@Published var account = AccountModel()
@Published var preferences = PreferencesModel()
@Published var store = PostStore()
@Published var collections = CollectionListModel()
@Published var isLoggingIn: Bool = false
@Published var selectedPost: Post?
private var client: WFClient?
private let defaults = UserDefaults.standard
init() {
// Set the color scheme based on what's been saved in UserDefaults.
DispatchQueue.main.async {
self.preferences.appearance = self.defaults.integer(forKey: self.preferences.colorSchemeIntegerKey)
}
#if DEBUG
// for post in testPostData { store.add(post) }
#endif
DispatchQueue.main.async {
self.account.restoreState()
if self.account.isLoggedIn {
guard let serverURL = URL(string: self.account.server) else {
print("Server URL not found")
return
}
guard let token = self.fetchTokenFromKeychain(
username: self.account.username,
server: self.account.server
) else {
print("Could not fetch token from Keychain")
return
}
self.account.login(WFUser(token: token, username: self.account.username))
self.client = WFClient(for: serverURL)
self.client?.user = self.account.user
if self.collections.userCollections.count == 0 {
self.fetchUserCollections()
}
self.fetchUserPosts()
}
}
}
}
// MARK: - WriteFreelyModel API
extension WriteFreelyModel {
func login(to server: URL, as username: String, password: String) {
isLoggingIn = true
account.server = server.absoluteString
client = WFClient(for: server)
client?.login(username: username, password: password, completion: loginHandler)
}
func logout() {
guard let loggedInClient = client else {
do {
try purgeTokenFromKeychain(username: account.username, server: account.server)
account.logout()
} catch {
fatalError("Failed to log out persisted state")
}
return
}
loggedInClient.logout(completion: logoutHandler)
}
func fetchUserCollections() {
guard let loggedInClient = client else { return }
loggedInClient.getUserCollections(completion: fetchUserCollectionsHandler)
}
func fetchUserPosts() {
guard let loggedInClient = client else { return }
loggedInClient.getPosts(completion: fetchUserPostsHandler)
}
func publish(post: Post) {
guard let loggedInClient = client else { return }
if let existingPostId = post.wfPost.postId {
// This is an existing post.
loggedInClient.updatePost(
postId: existingPostId,
updatedPost: post.wfPost,
completion: publishHandler
)
} else {
// This is a new local draft.
loggedInClient.createPost(
post: post.wfPost, in: post.collection?.alias, completion: publishHandler
)
}
}
func updateFromServer(post: Post) {
guard let loggedInClient = client else { return }
guard let postId = post.wfPost.postId else { return }
DispatchQueue.main.async {
self.selectedPost = post
}
loggedInClient.getPost(byId: postId, completion: updateFromServerHandler)
}
}
private extension WriteFreelyModel {
func loginHandler(result: Result<WFUser, Error>) {
DispatchQueue.main.async {
self.isLoggingIn = false
}
do {
let user = try result.get()
fetchUserCollections()
fetchUserPosts()
saveTokenToKeychain(user.token, username: user.username, server: account.server)
DispatchQueue.main.async {
self.account.login(user)
}
} catch WFError.notFound {
DispatchQueue.main.async {
self.account.currentError = AccountError.usernameNotFound
}
} catch WFError.unauthorized {
DispatchQueue.main.async {
self.account.currentError = AccountError.invalidPassword
}
} catch {
if (error as NSError).domain == NSURLErrorDomain,
(error as NSError).code == -1003 {
DispatchQueue.main.async {
self.account.currentError = AccountError.serverNotFound
}
}
}
}
func logoutHandler(result: Result<Bool, Error>) {
do {
_ = try result.get()
do {
try purgeTokenFromKeychain(username: account.user?.username, server: account.server)
client = nil
DispatchQueue.main.async {
self.account.logout()
self.collections.clearUserCollection()
self.store.purgeAllPosts()
}
} catch {
print("Something went wrong purging the token from the Keychain.")
}
} catch WFError.notFound {
// The user token is invalid or doesn't exist, so it's been invalidated by the server. Proceed with
// purging the token from the Keychain, destroying the client object, and setting the AccountModel to its
// logged-out state.
do {
try purgeTokenFromKeychain(username: account.user?.username, server: account.server)
client = nil
DispatchQueue.main.async {
self.collections.clearUserCollection()
self.account.logout()
self.store.purgeAllPosts()
}
} catch {
print("Something went wrong purging the token from the Keychain.")
}
} catch {
// We get a 'cannot parse response' (similar to what we were seeing in the Swift package) NSURLError here,
// so we're using a hacky workaround — if we get the NSURLError, but the AccountModel still thinks we're
// logged in, try calling the logout function again and see what we get.
// Conditional cast from 'Error' to 'NSError' always succeeds but is the only way to check error properties.
if (error as NSError).domain == NSURLErrorDomain,
(error as NSError).code == NSURLErrorCannotParseResponse {
if account.isLoggedIn {
self.logout()
}
}
}
}
func fetchUserCollectionsHandler(result: Result<[WFCollection], Error>) {
DispatchQueue.main.async {
self.collections.loadCachedUserCollections()
}
do {
let fetchedCollections = try result.get()
for fetchedCollection in fetchedCollections {
DispatchQueue.main.async {
let localCollection = WFACollection(context: PersistenceManager.persistentContainer.viewContext)
localCollection.alias = fetchedCollection.alias
localCollection.blogDescription = fetchedCollection.description
localCollection.email = fetchedCollection.email
localCollection.isPublic = fetchedCollection.isPublic ?? false
localCollection.styleSheet = fetchedCollection.styleSheet
localCollection.title = fetchedCollection.title
localCollection.url = fetchedCollection.url
}
}
DispatchQueue.main.async {
PersistenceManager().saveContext()
}
} catch {
print(error)
}
}
func fetchUserPostsHandler(result: Result<[WFPost], Error>) {
do {
let fetchedPosts = try result.get()
var fetchedPostsArray: [Post] = []
for fetchedPost in fetchedPosts {
var post: Post
if let matchingAlias = fetchedPost.collectionAlias {
let matchingCachedCollection = (
collections.userCollections.filter { $0.alias == matchingAlias }
).first
post = Post(wfPost: fetchedPost, in: matchingCachedCollection)
} else {
post = Post(wfPost: fetchedPost)
}
fetchedPostsArray.append(post)
}
DispatchQueue.main.async {
self.store.updateStore(with: fetchedPostsArray)
}
} catch {
print(error)
}
}
func publishHandler(result: Result<WFPost, Error>) {
do {
let wfPost = try result.get()
let foundPostIndex = store.posts.firstIndex(where: {
$0.wfPost.title == wfPost.title && $0.wfPost.body == wfPost.body
})
guard let index = foundPostIndex else { return }
DispatchQueue.main.async {
self.store.posts[index].wfPost = wfPost
}
} catch {
print(error)
}
}
func updateFromServerHandler(result: Result<WFPost, Error>) {
do {
let fetchedPost = try result.get()
DispatchQueue.main.async {
guard let selectedPost = self.selectedPost else { return }
self.store.replace(post: selectedPost, with: fetchedPost)
}
} catch {
print(error)
}
}
}
private extension WriteFreelyModel {
// MARK: - Keychain Helpers
func saveTokenToKeychain(_ token: String, username: String?, server: String) {
let query: [String: Any] = [
kSecClass as String: kSecClassGenericPassword,
kSecValueData as String: token.data(using: .utf8)!,
kSecAttrAccount as String: username ?? "anonymous",
kSecAttrService as String: server
]
let status = SecItemAdd(query as CFDictionary, nil)
guard status == errSecDuplicateItem || status == errSecSuccess else {
fatalError("Error storing in Keychain with OSStatus: \(status)")
}
}
func purgeTokenFromKeychain(username: String?, server: String) throws {
let query: [String: Any] = [
kSecClass as String: kSecClassGenericPassword,
kSecAttrAccount as String: username ?? "anonymous",
kSecAttrService as String: server
]
let status = SecItemDelete(query as CFDictionary)
guard status == errSecSuccess || status == errSecItemNotFound else {
fatalError("Error deleting from Keychain with OSStatus: \(status)")
}
}
func fetchTokenFromKeychain(username: String?, server: String) -> String? {
let query: [String: Any] = [
kSecClass as String: kSecClassGenericPassword,
kSecAttrAccount as String: username ?? "anonymous",
kSecAttrService as String: server,
kSecMatchLimit as String: kSecMatchLimitOne,
kSecReturnAttributes as String: true,
kSecReturnData as String: true
]
var secItem: CFTypeRef?
let status = SecItemCopyMatching(query as CFDictionary, &secItem)
guard status != errSecItemNotFound else {
return nil
}
guard status == errSecSuccess else {
fatalError("Error fetching from Keychain with OSStatus: \(status)")
}
guard let existingSecItem = secItem as? [String: Any],
let tokenData = existingSecItem[kSecValueData as String] as? Data,
let token = String(data: tokenData, encoding: .utf8) else {
return nil
}
return token
}
}

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