fix(iOS): Resolve crash when using WebKit CookieManager.get with missing URL protocol (#13)

* Resolve crash for invalid URLs

* Update error message

Author: safaiyeh

ios/RNCookieManagerIOS/RNCookieManagerIOS.m

@@ -13,6 +13,7 @@
 #endif
 
 static NSString * const NOT_AVAILABLE_ERROR_MESSAGE = @"WebKit/WebKit-Components are only available with iOS11 and higher!";
+static NSString * const INVALID_URL_MISSING_HTTP = @"Invalid URL: It may be missing a protocol (ex. http:// or https://).";
 
 @implementation RNCookieManagerIOS
 
@@ -109,6 +110,11 @@ -(NSString *)getDomainName:(NSURL *) url
     NSInteger maxLength = 2;
 
     NSURLComponents *components = [[NSURLComponents alloc]initWithURL:url resolvingAgainstBaseURL:FALSE];
+
+    if ([components.host isEqual: @""] || components.host == nil) {
+        return nil;
+    }
+
     NSArray<NSString *> *separatedHost = [components.host componentsSeparatedByString:separator];
     NSInteger count = [separatedHost count];
     NSInteger endPosition = count;
@@ -133,6 +139,11 @@ -(NSString *)getDomainName:(NSURL *) url
             dispatch_async(dispatch_get_main_queue(), ^(){
                 NSString *topLevelDomain = [self getDomainName:url];
 
+                if (topLevelDomain == nil) {
+                    reject(@"", INVALID_URL_MISSING_HTTP, nil);
+                    return;
+                }
+
                 WKHTTPCookieStore *cookieStore = [[WKWebsiteDataStore defaultDataStore] httpCookieStore];
                 [cookieStore getAllCookies:^(NSArray<NSHTTPCookie *> *allCookies) {
                     NSMutableDictionary *cookies = [NSMutableDictionary dictionary];