fix: Avoid Keychain's errSecInteractionNotAllowed error on iOS 15

For iOS 15, on SecureStorage's init method, if ProtectedData is unavailable, add an observer for the UIApplicationProtectedDataDidBecomeAvailable notification that re-triggers init when it becomes available.

Author: OS-ricardomoreirasilva

CHANGELOG

@@ -1,6 +1,11 @@
 Changelog
 =========
 
+2.6.8-OS12 - 2022-04-14
+------------------
+
+- Fix: For iOS 15, on the `init` method, if ProtectedData is unavailable, add an observer for the `UIApplicationProtectedDataDidBecomeAvailable` notification that re-triggers `init` when it becomes available. (RMET-1417)
+
 2.6.8-OS11 - 2022-04-12
 ------------------
 

package.json

@@ -1,6 +1,6 @@
 {
   "name": "cordova-plugin-secure-storage",
-  "version": "2.6.8-OS11",
+  "version": "2.6.8-OS12",
   "description": "Secure storage plugin for iOS & Android",
   "author": "Yiorgis Gozadinos <ggozad@crypho.com>",
   "contributors": [

plugin.xml

@@ -2,7 +2,7 @@
 <plugin xmlns="http://apache.org/cordova/ns/plugins/1.0"
     xmlns:android="http://schemas.android.com/apk/res/android"
     id="cordova-plugin-secure-storage"
-    version="2.6.8-OS11">
+    version="2.6.8-OS12">
 
     <name>SecureStorage</name>
     <author>Crypho AS</author>

src/ios/SecureStorage.m

@@ -4,10 +4,37 @@
 #import <Cordova/CDV.h>
 #import "SAMKeychain.h"
 
+@interface SecureStorage ()
+
+/// This local property is used to store the command to execute when SecureStorage tries to access Keychain without Protected Data Access being available. It's included as a fix for the iOS 15 pre-warm functionality.
+@property(nonatomic, strong) CDVInvokedUrlCommand *savedCommand API_AVAILABLE(ios(15));
+
+@end
+
 @implementation SecureStorage
 
+/// Method triggered when the `UIApplicationProtectedDataDidBecomeAvailable`  notification is trigged.
+- (void)dataBecameAvailableNotification:(NSNotification *)notification API_AVAILABLE(ios(15))
+{
+    // Re-triggers the `init` method as before, using the stored command
+    [self init:self.savedCommand];
+}
+
 - (void)init:(CDVInvokedUrlCommand*)command
 {
+    if (@available(iOS 15, *)) {    
+        // if Protected Data Acess is not yet available, the app observes the `dataBecomeAvailableNotification:`, so that the method resumes when the notification is triggered
+        if (!UIApplication.sharedApplication.isProtectedDataAvailable) {
+            self.savedCommand = command;
+            [NSNotificationCenter.defaultCenter addObserver:self selector:@selector(dataBecameAvailableNotification:) name:UIApplicationProtectedDataDidBecomeAvailable object:nil];
+            return;
+        }
+        
+        // all good, we can remove what was added and proceed.
+        self.savedCommand = nil;
+        [NSNotificationCenter.defaultCenter removeObserver:self name:UIApplicationProtectedDataDidBecomeAvailable object:nil];
+    }
+
     CFTypeRef accessibility;
     NSString *keychainAccessibility;
     NSDictionary *keychainAccesssibilityMapping;