XXXApolloOpener.m

#import <Opener/Opener.h>

@interface XXXApolloOpener : HBLOHandler

@end

@implementation XXXApolloOpener

- (instancetype)init {
    self = [super init];

    if (self) {
        self.name = @"Apollo Opener";
        self.identifier = @"com.gilshahar7.apolloopener";
    }

    return self;
}

- (id)openURL:(NSURL *)url sender:(NSString *)sender {
	
    if ([url.host isEqualToString:@"www.reddit.com"] ||
        [url.host isEqualToString:@"reddit.com"] ||
        [url.host isEqualToString:@"m.reddit.com"] ||
        [url.host isEqualToString:@"old.reddit.com"] ||
        [url.host isEqualToString:@"reddit.app.link] ||
	[url.host containsString:@".reddit.com"]) {
        
	    
        if ([url.host isEqualToString:@"reddit.app.link"]) {
             NSURLComponents *urlComponents = [NSURLComponents componentsWithURL:url 
                                                 resolvingAgainstBaseURL:NO];
             NSArray *queryItems = urlComponents.queryItems;
             NSString *og_redirect = [self valueForKey:@"$og_redirect" 
                             fromQueryItems:queryItems];

             if ([og_redirect length] != 0) {
                 url = [NSURL URLWithString:og_redirect];
             } else {
                 return nil;
             }
         }

         return [self createApolloURLFromURL:url];
     }

     return nil;
 }

 - (NSURL *)createApolloURLFromURL:(NSURL *)url {
     if ([url.path isEqualToString:@"/"] || [url.path isEqualToString:@""]) {
         return [NSURL URLWithString:@"apollo://"];
     } else {
         return [NSURL URLWithString:[NSString stringWithFormat:@"apollo://reddit.com%@/?%@", url.path, url.query]];
     }
 }

 /*
 Thanks to:
 - https://stackoverflow.com/questions/8756683/best-way-to-parse-url-string-to-get-values-for-keys
 - https://stackoverflow.com/questions/8756683/best-way-to-parse-url-string-to-get-values-for-keys/26406426#26406426
 - gilshahar7 for original code
 - Vantablack for the fix
 */
 - (NSString *)valueForKey:(NSString *)key fromQueryItems:(NSArray *)queryItems {

     NSPredicate *predicate = [NSPredicate predicateWithFormat:@"name=%@", key];
     NSURLQueryItem *queryItem = [[queryItems 
                                   filteredArrayUsingPredicate:predicate]
                                  firstObject];
     return queryItem.value;
 }

@end