[iOS] - Add exemption list for NightMode (#27798)

Author: Brandon-T

ios/brave-ios/Sources/Brave/Frontend/Browser/Tab.swift

@@ -414,7 +414,9 @@ class Tab: NSObject {
     didSet {
       var isNightModeEnabled = false
 
-      if let fetchedTabURL = fetchedURL, nightMode {
+      if let fetchedTabURL = fetchedURL, nightMode,
+        !DarkReaderScriptHandler.isNightModeBlockedURL(fetchedTabURL)
+      {
         isNightModeEnabled = true
       }
 

ios/brave-ios/Sources/Brave/Frontend/UserContent/UserScripts/Scripts_Dynamic/ScriptHandlers/Sandboxed/DarkReaderScriptHandler.swift

@@ -100,9 +100,48 @@ public class DarkReaderScriptHandler: TabContentScript {
     Preferences.General.nightModeEnabled.value = enabled
 
     for tab in tabManager.allTabs {
-      if let fetchedTabURL = tab.fetchedURL {
+      if let fetchedTabURL = tab.fetchedURL, !isNightModeBlockedURL(fetchedTabURL) {
         tab.nightMode = enabled
       }
     }
   }
 }
+
+extension DarkReaderScriptHandler {
+  // Check if the website is a night mode blocked site
+  public static func isNightModeBlockedURL(_ url: URL) -> Bool {
+    // The reason we use `normalizedHost` is because we want to keep the eTLD+1
+    // IE: (search.brave.com instead of brave.com)
+    guard let urlHost = url.normalizedHost(), let registry = url.publicSuffix else {
+      return false
+    }
+
+    // Remove the `registry` so we get `search.brave` instead of `search.brave.com`
+    // We get amazon instead of amazon.co.uk
+    // mail.proton instead of mail.proton.com
+    let domainName = urlHost.dropLast(registry.count).trimmingCharacters(
+      in: CharacterSet(charactersIn: ".")
+    )
+
+    // Site domains that should NOT inject night mode
+    let siteList = Set([
+      "twitter", "youtube", "twitch",
+      "soundcloud", "github", "netflix",
+      "imdb", "mail.proton", "amazon",
+      "x", "search.brave",
+
+      // Search Engines
+      "search.brave", "google", "qwant",
+      "startpage", "duckduckgo", "presearch",
+
+      // Dev sites
+      "macrumors", "9to5mac", "developer.apple",
+
+      // Casual sites
+      "wowhead", "xbox", "thegamer",
+      "cineplex", "starwars",
+    ])
+
+    return siteList.contains(domainName)
+  }
+}

ios/brave-ios/Tests/ClientTests/DarkModeTests.swift

@@ -0,0 +1,66 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
+import TestHelpers
+import UIKit
+import XCTest
+
+@testable import Brave
+
+class DarkModeTests: XCTestCase {
+
+  func testNightModeBlockedURL() {
+    let blockList = [
+      "twitter.com",
+      "m.twitter.com",
+      "youtube.com",
+      "m.youtube.com",
+      "www.youtube.com",
+      "amazon.co.uk",
+      "amazon.com",
+      "m.amazon.com",
+      "m.amazon.co.uk",
+      "x.com",
+      "m.x.com",
+      "search.brave.com",
+      "m.search.brave.com",
+      "www.search.brave.com",
+    ]
+
+    let allowList = [
+      "twitter.brave.com",
+      "m.twitter.brave.com",
+      "m.search.amazon.com",
+      "m.search.amazon.co.uk",
+      "search.amazon.co.uk",
+      "search.amazon.brave.com",
+      "m.brave.com",
+      "brave.com",
+      "talk.brave.com",
+      "bbc.co.uk",
+      "news.bbc.co.uk",
+      "bbc.example.co.uk",
+      "example.bbc.foo.co.uk",
+      "example.bbc.foo.com",
+    ]
+
+    for urlString in blockList {
+      guard let url = URL(string: "https://\(urlString)") else {
+        XCTFail("Invalid URL: \(urlString)")
+        continue
+      }
+
+      XCTAssertTrue(DarkReaderScriptHandler.isNightModeBlockedURL(url))
+    }
+
+    for urlString in allowList {
+      guard let url = URL(string: "https://\(urlString)") else {
+        XCTFail("Invalid URL: \(urlString)")
+        continue
+      }
+
+      XCTAssertFalse(DarkReaderScriptHandler.isNightModeBlockedURL(url))
+    }
+  }
+}