Refactoring

ServiceLayer/Sources/ServiceLayer/Services/InstanceURLService.swift

@@ -18,18 +18,26 @@ public struct InstanceURLService {
 }
 
 public extension InstanceURLService {
-    static func url(text: String) -> URL? {
+    func url(text: String) -> URL? {
-        guard text.count >= shortestPossibleURLLength else { return nil }
+        guard text.count >= Self.shortestPossibleURLLength else { return nil }
 
-        if text.hasPrefix(httpsPrefix), let prefixedURL = URL(string: text) {
+        let url: URL
-            return prefixedURL
+
-        } else if let unprefixedURL = URL(string: httpsPrefix + text) {
+        if text.hasPrefix(Self.httpsPrefix), let prefixedURL = URL(string: text) {
-            return unprefixedURL
+            url = prefixedURL
+        } else if let unprefixedURL = URL(string: Self.httpsPrefix + text) {
+            url = unprefixedURL
+        } else {
+            return nil
         }
 
+        if isFiltered(url: url) {
             return nil
         }
 
+        return url
+    }
+
     func instance(url: URL) -> AnyPublisher<Instance?, Never> {
         httpClient.request(
             MastodonAPITarget(
@@ -52,23 +60,6 @@ public extension InstanceURLService {
             .eraseToAnyPublisher()
     }
 
-    func isFiltered(url: URL) -> Bool {
-        guard let host = url.host else { return true }
-
-        let allHostComponents = host.components(separatedBy: ".")
-        var hostComponents = [String]()
-
-        for component in allHostComponents.reversed() {
-            hostComponents.insert(component, at: 0)
-
-            if filter.contains(hostComponents.joined(separator: ".")) {
-                return true
-            }
-        }
-
-        return false
-    }
-
     func updateFilter() -> AnyPublisher<Never, Never> {
         httpClient.request(UpdatedFilterTarget())
             .handleEvents(receiveOutput: { userDefaultsClient.updatedInstanceFilter = $0 })
@@ -104,4 +95,21 @@ private extension InstanceURLService {
     var filter: BloomFilter<String> {
         userDefaultsClient.updatedInstanceFilter ?? Self.defaultFilter
     }
+
+    private func isFiltered(url: URL) -> Bool {
+        guard let host = url.host else { return true }
+
+        let allHostComponents = host.components(separatedBy: ".")
+        var hostComponents = [String]()
+
+        for component in allHostComponents.reversed() {
+            hostComponents.insert(component, at: 0)
+
+            if filter.contains(hostComponents.joined(separator: ".")) {
+                return true
+            }
+        }
+
+        return false
+    }
 }

ViewModels/Sources/ViewModels/AddIdentityViewModel.swift

@@ -28,17 +28,23 @@ public final class AddIdentityViewModel: ObservableObject {
         addedIdentityID = addedIdentityIDSubject.eraseToAnyPublisher()
 
         let url = $urlFieldText
-            .debounce(for: 0.5, scheduler: DispatchQueue.main)
+            .debounce(for: 0.5, scheduler: DispatchQueue.global())
             .removeDuplicates()
-            .compactMap(InstanceURLService.url(text:))
+            .map(instanceURLService.url(text:))
-            .filter { !instanceURLService.isFiltered(url: $0) }
             .share()
+        let urlPresent =  url.map { $0 != nil }.share()
 
-        url.flatMap(instanceURLService.instance(url:))
+        url.compactMap { $0 }
+            .flatMap(instanceURLService.instance(url:))
+            .combineLatest(urlPresent)
+            .map { $1 ? $0 : nil }
             .receive(on: DispatchQueue.main)
             .assign(to: &$instance)
 
-        url.flatMap(instanceURLService.isPublicTimelineAvailable(url:))
+        url.compactMap { $0 }
+            .flatMap(instanceURLService.isPublicTimelineAvailable(url:))
+            .combineLatest(urlPresent)
+            .map { $0 && $1 }
             .receive(on: DispatchQueue.main)
             .assign(to: &$isPublicTimelineAvailable)
     }
@@ -64,23 +70,12 @@ private extension AddIdentityViewModel {
     func addIdentity(authenticated: Bool) {
         let identityID = UUID()
 
-        guard let url = InstanceURLService.url(text: urlFieldText) else {
+        guard let url = instanceURLService.url(text: urlFieldText) else {
             alertItem = AlertItem(error: AddIdentityError.unableToConnectToInstance)
 
             return
         }
 
-        if instanceURLService.isFiltered(url: url) {
-            loading = true
-
-            DispatchQueue.main.asyncAfter(deadline: .now() + .random(in: 0.01...0.1)) {
-                self.alertItem = AlertItem(error: AddIdentityError.unableToConnectToInstance)
-                self.loading = false
-            }
-
-            return
-        }
-
         allIdentitiesService.createIdentity(
             id: identityID,
             url: url,