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WriteFreelyModel+APIHandlers.swift
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WriteFreelyModel+APIHandlers.swift
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import Foundation
import WriteFreely
extension WriteFreelyModel {
func loginHandler(result: Result<WFUser, Error>) {
DispatchQueue.main.async {
self.isLoggingIn = false
}
do {
let user = try result.get()
fetchUserCollections()
fetchUserPosts()
do {
try saveTokenToKeychain(user.token, username: user.username, server: account.server)
DispatchQueue.main.async {
self.account.login(user)
}
} catch {
self.currentError = KeychainError.couldNotStoreAccessToken
}
} catch WFError.notFound {
self.currentError = AccountError.usernameNotFound
} catch WFError.unauthorized {
self.currentError = AccountError.invalidPassword
} catch {
if (error as NSError).domain == NSURLErrorDomain,
(error as NSError).code == -1003 {
self.currentError = AccountError.serverNotFound
} else {
self.currentError = error
}
}
}
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()
do {
try LocalStorageManager.standard.purgeUserCollections()
try self.posts.purgePublishedPosts()
} catch {
self.currentError = error
}
}
} catch {
self.currentError = KeychainError.couldNotPurgeAccessToken
}
} 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.account.logout()
do {
try LocalStorageManager.standard.purgeUserCollections()
try self.posts.purgePublishedPosts()
} catch {
self.currentError = error
}
}
} catch {
self.currentError = KeychainError.couldNotPurgeAccessToken
}
} 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>) {
// We're done with the network request.
DispatchQueue.main.async {
self.isProcessingRequest = false
}
do {
let fetchedCollections = try result.get()
for fetchedCollection in fetchedCollections {
DispatchQueue.main.async {
let localCollection = WFACollection(context: LocalStorageManager.standard.container.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 {
LocalStorageManager.standard.saveContext()
}
} catch WFError.unauthorized {
self.currentError = AccountError.genericAuthError
self.logout()
} catch {
self.currentError = AppError.genericError(error.localizedDescription)
}
}
func fetchUserPostsHandler(result: Result<[WFPost], Error>) {
// We're done with the network request.
DispatchQueue.main.async {
self.isProcessingRequest = false
}
let request = WFAPost.createFetchRequest()
do {
let locallyCachedPosts = try LocalStorageManager.standard.container.viewContext.fetch(request)
do {
var postsToDelete = locallyCachedPosts.filter { $0.status != PostStatus.local.rawValue }
let fetchedPosts = try result.get()
for fetchedPost in fetchedPosts {
if let managedPost = locallyCachedPosts.first(where: { $0.postId == fetchedPost.postId }) {
DispatchQueue.main.async {
managedPost.wasDeletedFromServer = false
if let fetchedPostUpdatedDate = fetchedPost.updatedDate,
let localPostUpdatedDate = managedPost.updatedDate {
managedPost.hasNewerRemoteCopy = fetchedPostUpdatedDate > localPostUpdatedDate
} else {
self.currentError = AppError.genericError(
"Error updating post: could not determine which copy of post is newer."
)
}
postsToDelete.removeAll(where: { $0.postId == fetchedPost.postId })
}
} else {
DispatchQueue.main.async {
let managedPost = WFAPost(context: LocalStorageManager.standard.container.viewContext)
self.importData(from: fetchedPost, into: managedPost)
managedPost.collectionAlias = fetchedPost.collectionAlias
managedPost.wasDeletedFromServer = false
}
}
}
DispatchQueue.main.async {
for post in postsToDelete { post.wasDeletedFromServer = true }
LocalStorageManager.standard.saveContext()
}
} catch {
self.currentError = AppError.genericError(error.localizedDescription)
}
} catch WFError.unauthorized {
self.currentError = AccountError.genericAuthError
self.logout()
} catch {
self.currentError = LocalStoreError.couldNotFetchPosts("cached")
}
}
func publishHandler(result: Result<WFPost, Error>) {
// We're done with the network request.
DispatchQueue.main.async {
self.isProcessingRequest = false
}
// ⚠️ NOTE:
// The API does not return a collection alias, so we take care not to overwrite the
// cached post's collection alias with the 'nil' value from the fetched post.
// See: https://github.com/writeas/writefreely-swift/issues/20
do {
let fetchedPost = try result.get()
// If this is an updated post, check it against postToUpdate.
if let updatingPost = self.postToUpdate {
importData(from: fetchedPost, into: updatingPost)
DispatchQueue.main.async {
LocalStorageManager.standard.saveContext()
}
} else {
// Otherwise if it's a newly-published post, find it in the local store.
let request = WFAPost.createFetchRequest()
let matchBodyPredicate = NSPredicate(format: "body == %@", fetchedPost.body)
if let fetchedPostTitle = fetchedPost.title {
let matchTitlePredicate = NSPredicate(format: "title == %@", fetchedPostTitle)
request.predicate = NSCompoundPredicate(
andPredicateWithSubpredicates: [
matchTitlePredicate,
matchBodyPredicate
]
)
} else {
request.predicate = matchBodyPredicate
}
do {
let cachedPostsResults = try LocalStorageManager.standard.container.viewContext.fetch(request)
guard let cachedPost = cachedPostsResults.first else { return }
importData(from: fetchedPost, into: cachedPost)
DispatchQueue.main.async {
LocalStorageManager.standard.saveContext()
}
} catch {
self.currentError = LocalStoreError.couldNotFetchPosts("cached")
}
}
} catch {
self.currentError = AppError.genericError(error.localizedDescription)
}
}
func updateFromServerHandler(result: Result<WFPost, Error>) {
// We're done with the network request.
DispatchQueue.main.async {
self.isProcessingRequest = false
}
// ⚠️ NOTE:
// The API does not return a collection alias, so we take care not to overwrite the
// cached post's collection alias with the 'nil' value from the fetched post.
// See: https://github.com/writeas/writefreely-swift/issues/20
do {
let fetchedPost = try result.get()
guard let cachedPost = self.selectedPost else { return }
importData(from: fetchedPost, into: cachedPost)
cachedPost.hasNewerRemoteCopy = false
DispatchQueue.main.async {
LocalStorageManager.standard.saveContext()
}
} catch {
self.currentError = AppError.genericError(error.localizedDescription)
}
}
func movePostHandler(result: Result<Bool, Error>) {
// We're done with the network request.
DispatchQueue.main.async {
self.isProcessingRequest = false
}
do {
let succeeded = try result.get()
if succeeded {
if let post = selectedPost {
updateFromServer(post: post)
} else {
return
}
}
} catch {
DispatchQueue.main.async {
LocalStorageManager.standard.container.viewContext.rollback()
}
self.currentError = AppError.genericError(error.localizedDescription)
}
}
private func importData(from fetchedPost: WFPost, into cachedPost: WFAPost) {
cachedPost.appearance = fetchedPost.appearance
cachedPost.body = fetchedPost.body
cachedPost.createdDate = fetchedPost.createdDate
cachedPost.language = fetchedPost.language
cachedPost.postId = fetchedPost.postId
cachedPost.rtl = fetchedPost.rtl ?? false
cachedPost.slug = fetchedPost.slug
cachedPost.status = PostStatus.published.rawValue
cachedPost.title = fetchedPost.title ?? ""
cachedPost.updatedDate = fetchedPost.updatedDate
}
}

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