7 files changed, 56 insertions, 6 deletions
diff --git a/Firebase/Auth/CHANGELOG.md b/Firebase/Auth/CHANGELOG.md
index 5a3fcef..292f8bd 100644
--- a/Firebase/Auth/CHANGELOG.md
+++ b/Firebase/Auth/CHANGELOG.md
@@ -1,9 +1,12 @@
+# v5.0.1
+- Restore 4.x level of support for extensions (#1357).
+
 # v5.0.0
 - Adds APIs for phone Auth testing to bypass the verification flow (#1192).
 - Changes the callback block signature for sign in and create user methods
   to provide an AuthDataResult that includes the user and user info (#1123, #1186).
 - Removes GoogleToolboxForMac dependency (#1175).
-- Removes misc. deprecated APIs (#1188, #1200)
+- Removes miscellaneous deprecated APIs (#1188, #1200).
 
 # v4.6.1
 - Fixes crash which occurred when certain Firebase IDTokens were being parsed (#1076).
diff --git a/Firebase/Auth/Source/FIRAuth.m b/Firebase/Auth/Source/FIRAuth.m
index c83a19a..81008ca 100644
--- a/Firebase/Auth/Source/FIRAuth.m
+++ b/Firebase/Auth/Source/FIRAuth.m
@@ -19,6 +19,7 @@
 #import "FIRAuth_Internal.h"
 
 #import <FirebaseCore/FIRAppAssociationRegistration.h>
+#import <FirebaseCore/FIRAppEnvironmentUtil.h>
 #import <FirebaseCore/FIRAppInternal.h>
 #import <FirebaseCore/FIRLogger.h>
 #import <FirebaseCore/FIROptions.h>
@@ -438,7 +439,18 @@ static NSMutableDictionary *gKeychainServiceNameForAppName;
     _settings = [[FIRAuthSettings alloc] init];
     _firebaseAppName = [appName copy];
     #if TARGET_OS_IOS
-    UIApplication *application = [UIApplication sharedApplication];
+
+    static Class applicationClass = nil;
+    // iOS App extensions should not call [UIApplication sharedApplication], even if UIApplication
+    // responds to it.
+    if (![FIRAppEnvironmentUtil isAppExtension]) {
+      Class cls = NSClassFromString(@"UIApplication");
+      if (cls && [cls respondsToSelector:NSSelectorFromString(@"sharedApplication")]) {
+        applicationClass = cls;
+      }
+    }
+    UIApplication *application = [applicationClass sharedApplication];
+
     // Initialize the shared FIRAuthAppDelegateProxy instance in the main thread if not already.
     [FIRAuthAppDelegateProxy sharedInstance];
     #endif
diff --git a/Firebase/Auth/Source/FIRAuthAppDelegateProxy.m b/Firebase/Auth/Source/FIRAuthAppDelegateProxy.m
index f13e94f..3289b4e 100644
--- a/Firebase/Auth/Source/FIRAuthAppDelegateProxy.m
+++ b/Firebase/Auth/Source/FIRAuthAppDelegateProxy.m
@@ -16,6 +16,8 @@
 
 #import "FIRAuthAppDelegateProxy.h"
 
+#import <FirebaseCore/FIRAppEnvironmentUtil.h>
+
 #import <objc/runtime.h>
 
 NS_ASSUME_NONNULL_BEGIN
@@ -200,8 +202,18 @@ static BOOL isIOS9orLater() {
 + (nullable instancetype)sharedInstance {
   static dispatch_once_t onceToken;
   static FIRAuthAppDelegateProxy *_Nullable sharedInstance;
+  // iOS App extensions should not call [UIApplication sharedApplication], even if UIApplication
+  // responds to it.
+  static Class applicationClass = nil;
+  if (![FIRAppEnvironmentUtil isAppExtension]) {
+    Class cls = NSClassFromString(@"UIApplication");
+    if (cls && [cls respondsToSelector:NSSelectorFromString(@"sharedApplication")]) {
+      applicationClass = cls;
+    }
+  }
+  UIApplication *application = [applicationClass sharedApplication];
   dispatch_once(&onceToken, ^{
-    sharedInstance = [[self alloc] initWithApplication:[UIApplication sharedApplication]];
+    sharedInstance = [[self alloc] initWithApplication:application];
   });
   return sharedInstance;
 }
diff --git a/Firebase/Auth/Source/FIRAuthDefaultUIDelegate.m b/Firebase/Auth/Source/FIRAuthDefaultUIDelegate.m
index a00d0e9..e5aa7f4 100644
--- a/Firebase/Auth/Source/FIRAuthDefaultUIDelegate.m
+++ b/Firebase/Auth/Source/FIRAuthDefaultUIDelegate.m
@@ -16,6 +16,8 @@
 
 #import "FIRAuthDefaultUIDelegate.h"
 
+#import <FirebaseCore/FIRAppEnvironmentUtil.h>
+
 NS_ASSUME_NONNULL_BEGIN
 
 @interface FIRAuthDefaultUIDelegate ()
@@ -58,8 +60,17 @@ NS_ASSUME_NONNULL_BEGIN
 }
 
 + (id<FIRAuthUIDelegate>)defaultUIDelegate {
-  UIViewController *topViewController =
-      [UIApplication sharedApplication].keyWindow.rootViewController;
+  // iOS App extensions should not call [UIApplication sharedApplication], even if UIApplication
+  // responds to it.
+  static Class applicationClass = nil;
+  if (![FIRAppEnvironmentUtil isAppExtension]) {
+    Class cls = NSClassFromString(@"UIApplication");
+    if (cls && [cls respondsToSelector:NSSelectorFromString(@"sharedApplication")]) {
+      applicationClass = cls;
+    }
+  }
+  UIApplication *application = [applicationClass sharedApplication];
+  UIViewController *topViewController = application.keyWindow.rootViewController;
   while (true){
     if (topViewController.presentedViewController) {
       topViewController = topViewController.presentedViewController;
diff --git a/Firebase/Core/CHANGELOG.md b/Firebase/Core/CHANGELOG.md
index f4707ea..e1f157a 100644
--- a/Firebase/Core/CHANGELOG.md
+++ b/Firebase/Core/CHANGELOG.md
@@ -1,4 +1,12 @@
 # Unreleased
+
+# 2018-05-29 -- v5.0.2 -- M26
+- [changed] Delayed library registration call from `+load` to `+initialize`. (#1305)
+
+# 2018-05-15 -- v5.0.1 -- M25.1
+- [fixed] Eliminated duplicate symbol in CocoaPods `-all_load build` (#1223)
+
+# 2018-05-08 -- v5.0.0 -- M25
 - [changed] Removed `UIKit` import from `FIRApp.h`.
 - [changed] Removed deprecated methods.
 
diff --git a/Firebase/Core/FIROptions.m b/Firebase/Core/FIROptions.m
index 22c9818..ecdd9e9 100644
--- a/Firebase/Core/FIROptions.m
+++ b/Firebase/Core/FIROptions.m
@@ -43,7 +43,7 @@ NSString *const kFIRIsSignInEnabled = @"IS_SIGNIN_ENABLED";
 NSString *const kFIRLibraryVersionID =
     @"5"     // Major version (one or more digits)
     @"00"    // Minor version (exactly 2 digits)
-    @"01"    // Build number (exactly 2 digits)
+    @"02"    // Build number (exactly 2 digits)
     @"000";  // Fixed "000"
 // Plist file name.
 NSString *const kServiceInfoFileName = @"GoogleService-Info";
diff --git a/Firebase/Messaging/CHANGELOG.md b/Firebase/Messaging/CHANGELOG.md
index 22b5031..a11be06 100644
--- a/Firebase/Messaging/CHANGELOG.md
+++ b/Firebase/Messaging/CHANGELOG.md
@@ -1,3 +1,7 @@
+# 2015-06-12 -- v3.0.2
+- Added a warning message when subscribing to topics with incorrect name formats.
+- Silenced a deprecation warning in FIRMessaging.
+
 # 2018-05-29 -- v3.0.1
 - Clean up a few deprecation warnings.