session-ios/SignalUtilitiesKit/LKGroupUtilities.m

#import "LKGroupUtilities.h"
#import <SessionProtocolKit/SessionProtocolKit.h>

@implementation LKGroupUtilities

#define ClosedGroupPrefix @"__textsecure_group__!" // a.k.a. private group chat
#define MMSGroupPrefix @"__signal_mms_group__!"
#define OpenGroupPrefix @"__loki_public_chat_group__!" // a.k.a. public group chat
#define RSSFeedPrefix @"__loki_rss_feed_group__!"

+(NSString *)getEncodedOpenGroupID:(NSString *)groupID
{
    return [OpenGroupPrefix stringByAppendingString:groupID];
}

+(NSData *)getEncodedOpenGroupIDAsData:(NSString *)groupID
{
    return [[OpenGroupPrefix stringByAppendingString:groupID] dataUsingEncoding:NSUTF8StringEncoding];
}

+(NSString *)getEncodedRSSFeedID:(NSString *)groupID
{
    return [RSSFeedPrefix stringByAppendingString:groupID];
}

+(NSData *)getEncodedRSSFeedIDAsData:(NSString *)groupID
{
    return [[RSSFeedPrefix stringByAppendingString:groupID] dataUsingEncoding:NSUTF8StringEncoding];
}

+(NSString *)getEncodedClosedGroupID:(NSString *)groupID
{
    return [ClosedGroupPrefix stringByAppendingString:groupID];
}

+(NSData *)getEncodedClosedGroupIDAsData:(NSString *)groupID
{
    return [[ClosedGroupPrefix stringByAppendingString:groupID] dataUsingEncoding:NSUTF8StringEncoding];
}

+(NSString *)getEncodedMMSGroupID:(NSString *)groupID
{
    return [MMSGroupPrefix stringByAppendingString:groupID];
}

+(NSData *)getEncodedMMSGroupIDAsData:(NSString *)groupID
{
    return [[MMSGroupPrefix stringByAppendingString:groupID] dataUsingEncoding:NSUTF8StringEncoding];
}

+(NSString *)getEncodedGroupID: (NSData *)groupID
{
    return [[NSString alloc] initWithData:groupID encoding:NSUTF8StringEncoding];
}

+(NSString *)getDecodedGroupID:(NSData *)groupID
{
    OWSAssertDebug(groupID.length > 0);
    NSString *encodedGroupID = [[NSString alloc] initWithData:groupID encoding:NSUTF8StringEncoding];
    if ([encodedGroupID componentsSeparatedByString:@"!"].count > 1) {
        return [encodedGroupID componentsSeparatedByString:@"!"][1];
    }
    return [encodedGroupID componentsSeparatedByString:@"!"][0];
}

+(NSData *)getDecodedGroupIDAsData:(NSData *)groupID
{
    OWSAssertDebug(groupID.length > 0);
    NSString *encodedGroupID = [[NSString alloc]initWithData:groupID encoding:NSUTF8StringEncoding];
    NSString *decodedGroupID = [encodedGroupID componentsSeparatedByString:@"!"][0];
    if ([encodedGroupID componentsSeparatedByString:@"!"].count > 1) {
        decodedGroupID = [encodedGroupID componentsSeparatedByString:@"!"][1];
    }
    return [decodedGroupID dataUsingEncoding:NSUTF8StringEncoding];
}

@end