Block gab.* domains from logging in

Tusker.xcodeproj/project.pbxproj

@@ -80,6 +80,7 @@
 		D6333B372137838300CE884A /* AttributedString+Helpers.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6333B362137838300CE884A /* AttributedString+Helpers.swift */; };
 		D6333B772138D94E00CE884A /* ComposeMediaView.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6333B762138D94E00CE884A /* ComposeMediaView.swift */; };
 		D6333B792139AEFD00CE884A /* Date+TimeAgo.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6333B782139AEFD00CE884A /* Date+TimeAgo.swift */; };
+		D640D76922BAF5E6004FBE69 /* DomainBlocks.plist in Resources */ = {isa = PBXBuildFile; fileRef = D640D76822BAF5E6004FBE69 /* DomainBlocks.plist */; };
 		D641C773213CAA25004B4513 /* NotificationsTableViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D641C772213CAA25004B4513 /* NotificationsTableViewController.swift */; };
 		D641C777213CAA9E004B4513 /* ActionNotificationTableViewCell.swift in Sources */ = {isa = PBXBuildFile; fileRef = D641C776213CAA9E004B4513 /* ActionNotificationTableViewCell.swift */; };
 		D641C779213CAC56004B4513 /* ActionNotificationTableViewCell.xib in Resources */ = {isa = PBXBuildFile; fileRef = D641C778213CAC56004B4513 /* ActionNotificationTableViewCell.xib */; };
@@ -314,6 +315,7 @@
 		D6333B362137838300CE884A /* AttributedString+Helpers.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "AttributedString+Helpers.swift"; sourceTree = "<group>"; };
 		D6333B762138D94E00CE884A /* ComposeMediaView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ComposeMediaView.swift; sourceTree = "<group>"; };
 		D6333B782139AEFD00CE884A /* Date+TimeAgo.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "Date+TimeAgo.swift"; sourceTree = "<group>"; };
+		D640D76822BAF5E6004FBE69 /* DomainBlocks.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = DomainBlocks.plist; sourceTree = "<group>"; };
 		D641C772213CAA25004B4513 /* NotificationsTableViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = NotificationsTableViewController.swift; sourceTree = "<group>"; };
 		D641C776213CAA9E004B4513 /* ActionNotificationTableViewCell.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ActionNotificationTableViewCell.swift; sourceTree = "<group>"; };
 		D641C778213CAC56004B4513 /* ActionNotificationTableViewCell.xib */ = {isa = PBXFileReference; lastKnownFileType = file.xib; path = ActionNotificationTableViewCell.xib; sourceTree = "<group>"; };
@@ -1014,6 +1016,7 @@
 				D6D4DDD6212518A200E1C4BB /* Assets.xcassets */,
 				D6D4DDD8212518A200E1C4BB /* LaunchScreen.storyboard */,
 				D6D4DDDB212518A200E1C4BB /* Info.plist */,
+				D640D76822BAF5E6004FBE69 /* DomainBlocks.plist */,
 			);
 			path = Tusker;
 			sourceTree = "<group>";
@@ -1306,6 +1309,7 @@
 				D6D4DDD7212518A200E1C4BB /* Assets.xcassets in Resources */,
 				D663625D2135C74800C9CBA2 /* ConversationMainStatusTableViewCell.xib in Resources */,
 				D6A5FAFB217B86CE003DB2D9 /* OnboardingViewController.xib in Resources */,
+				D640D76922BAF5E6004FBE69 /* DomainBlocks.plist in Resources */,
 				D641C77B213CB017004B4513 /* FollowNotificationTableViewCell.xib in Resources */,
 				D6289E84217B795D0003D1D7 /* LargeImageViewController.xib in Resources */,
 				D663626621360DD700C9CBA2 /* Preferences.storyboard in Resources */,

Tusker/DomainBlocks.plist

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<array>
+	<string>gab\..+</string>
+</array>
+</plist>

Tusker/Screens/Onboarding/OnboardingViewController.swift

@@ -17,6 +17,12 @@ protocol OnboardingViewControllerDelegate {
 
 class OnboardingViewController: UIViewController {
 
+    static var blocks: [NSRegularExpression] = {
+        guard let path = Bundle.main.path(forResource: "DomainBlocks", ofType: "plist"),
+            let array = NSArray(contentsOfFile: path) as? [String] else { return [] }
+        return array.compactMap { try? NSRegularExpression(pattern: $0, options: .caseInsensitive) }
+    }()
+    
     var delegate: OnboardingViewControllerDelegate?
     
     @IBOutlet weak var urlTextField: UITextField!
@@ -38,7 +44,15 @@ class OnboardingViewController: UIViewController {
     @IBAction func loginPressed(_ sender: Any) {
         guard let text = urlTextField.text,
             let url = URL(string: text),
-            var components = URLComponents(string: text) else { return }
+            var components = URLComponents(string: text),
+            let host = components.host,
+            !OnboardingViewController.blocks.contains(where: {
+                $0.numberOfMatches(in: host, range: NSRange(host.startIndex..<host.endIndex, in: host)) > 0
+            }) else {
+                return
+        }
+        
+        
         
         LocalData.shared.instanceURL = url
         MastodonController.createClient()