[Horizon] Crashlytics integration (#3303)

Author: szabinst

Core/Core/Features/Login/LoginFindSchoolViewController.swift

@@ -144,8 +144,10 @@ class LoginFindSchoolViewController: UIViewController {
         host = host.lowercased()
 
         // For manual oauth logins we trust the developer and don't modify the host.
-        if method != .manualOAuthLogin, !host.contains(".") {
+        if method != .manualOAuthLogin, !host.contains("."), env.app != .horizon {
             host = "\(host).instructure.com"
+        } else if env.app == .horizon {
+            host = replaceRootDomain(urlString: host, newRootDomain: "instructure.com") ?? ""
         }
 
         searchField.resignFirstResponder()
@@ -157,6 +159,32 @@ class LoginFindSchoolViewController: UIViewController {
         showLoginForHost(host)
     }
 
+    func replaceRootDomain(urlString: String, newRootDomain: String) -> String? {
+        let urlWithScheme = "https://\(urlString)"
+
+        guard let url = URL(string: urlWithScheme) else {
+            return nil
+        }
+
+        // Try to extract host, fallback to raw string if needed
+        let host = url.host ?? urlString
+        let parts = host.components(separatedBy: ".")
+
+        let subdomain: String
+        if parts.count >= 3 {
+            // Full domain with subdomain (subdomain.domain.com
+            subdomain = parts.dropLast(2).joined(separator: ".")
+        } else if parts.count == 1 {
+            // Only a subdomain was typed (subdomain)
+            subdomain = parts[0]
+        } else {
+            subdomain = parts.dropLast().joined(separator: ".")
+        }
+
+        let newHost = "\(subdomain).\(newRootDomain)"
+        return newHost
+    }
+
     private func toggleNextButtonVisibility() {
         if let host = searchField.text?.trimmingCharacters(in: .whitespacesAndNewlines), !host.isEmpty {
             nextButton.accessibilityIdentifier = "nextButton"

Horizon/Horizon/Sources/AppDelegate.swift

@@ -18,6 +18,7 @@
 
 import Combine
 import Core
+import Firebase
 import HorizonUI
 import UIKit
 
@@ -44,6 +45,10 @@ class AppDelegate: UIResponder, UIApplicationDelegate, AppEnvironmentDelegate {
         _: UIApplication,
         didFinishLaunchingWithOptions _: [UIApplication.LaunchOptionsKey: Any]?
     ) -> Bool {
+        // MARK: - Firebase
+
+        setupFirebase()
+
         // MARK: Root view
 
         window = UIWindow()
@@ -122,3 +127,57 @@ extension AppDelegate: Core.AnalyticsHandler {
         analyticsTracker.endSession()
     }
 }
+
+// MARK: - Crashlytics
+
+extension AppDelegate {
+    @objc func setupFirebase() {
+        guard !testing else {
+            setupDebugCrashLogging()
+            return
+        }
+
+        if FirebaseOptions.defaultOptions()?.apiKey != nil {
+            FirebaseApp.configure()
+            configureRemoteConfig()
+            Core.Analytics.shared.handler = self
+            RemoteLogger.shared.handler = self
+        }
+    }
+
+    func setupDebugCrashLogging() {
+        NSSetUncaughtExceptionHandler { exception in
+            print("CRASH: \(exception)")
+            print("Stack Trace:")
+            for symbol in exception.callStackSymbols {
+                print("  \(symbol)")
+            }
+        }
+    }
+
+    func configureRemoteConfig() {
+        let remoteConfig = RemoteConfig.remoteConfig()
+        remoteConfig.fetch(withExpirationDuration: 0) { _, _ in
+            remoteConfig.activate { _, _ in
+                let keys = remoteConfig.allKeys(from: .remote)
+                for key in keys {
+                    guard let feature = ExperimentalFeature(rawValue: key) else { continue }
+                    let value = remoteConfig.configValue(forKey: key).boolValue
+                    feature.isEnabled = value
+                    Firebase.Crashlytics.crashlytics().setCustomValue(value, forKey: feature.userDefaultsKey)
+                }
+            }
+        }
+    }
+}
+
+extension AppDelegate: RemoteLogHandler {
+    func handleBreadcrumb(_ name: String) {
+        Firebase.Crashlytics.crashlytics().log(name)
+    }
+
+    func handleError(_ name: String, reason: String) {
+        let model = ExceptionModel(name: name, reason: reason)
+        Firebase.Crashlytics.crashlytics().record(exceptionModel: model)
+    }
+}