klx_teacher/KulexiuForTeacher/KulexiuForTeacher/Common/Tools/Custom/KeyChainTools.m

//
//  KeyChainTools.m
//  TeacherDaya
//
//  Created by Kyle on 2020/12/24.
//  Copyright © 2020 DayaMusic. All rights reserved.
//

#import "KeyChainTools.h"
#import <Security/Security.h>

NSString *const KEY_ASSESSGROUP = @"B2AP53HHTU.Colexiu";

@implementation KeyChainTools

+ (NSString *)getUUID {

    //定义存入keychain中的账号 也就是一个标识 表示是某个app存储的内容   bundle id就好
    NSString * const KEY_UUID = @"com.Colexiu.Kulexiu.UUID";

    // 测试用 清除keychain中的内容

//     [self delete:KEY_UUID];

    //读取UUID
    NSMutableDictionary *readUUID = (NSMutableDictionary *)[self load:KEY_UUID];
    
    //NSLog(@"keychain------><>%@",readUserPwd);

    if (!readUUID) {

        //如果为空 说明是第一次安装 做存储操作
        NSString *identifierStr = [[[UIDevice currentDevice] identifierForVendor] UUIDString];
        identifierStr = [NSString stringToMD5:identifierStr];
        //NSLog(@"identifierStr-----><>%@",identifierStr);

        NSMutableDictionary *uuidDic = [NSMutableDictionary dictionaryWithObject:identifierStr forKey:KEY_UUID];

        [self save:KEY_UUID data:uuidDic];
        if (SUBMIT_UUID) {
            return identifierStr;
        }
        else {
            return nil;
        }
        

    }else{
        if (SUBMIT_UUID) {
            return [readUUID objectForKey:KEY_UUID];
        }
        else {
            return @"";
        }
    }

}

 

//储存

+ (void)save:(NSString *)service data:(id)data {
    
    //Get search dictionary
    
    NSMutableDictionary *keychainQuery = [self getKeychainQuery:service];
    
    //Delete old item before add new item
    
    SecItemDelete((__bridge CFDictionaryRef)keychainQuery);
    
    //Add new object to search dictionary(Attention:the data format)
    
    [keychainQuery setObject:[NSKeyedArchiver archivedDataWithRootObject:data] forKey:(__bridge id)kSecValueData];
    //Add item to keychain with the search dictionary
    
    OSStatus status = SecItemAdd((__bridge CFDictionaryRef)keychainQuery, NULL);
    NSLog(@"---%d", status);
}

 

+ (NSMutableDictionary *)getKeychainQuery:(NSString *)service {
    
    return [NSMutableDictionary dictionaryWithObjectsAndKeys:
            
            (__bridge id)kSecClassGenericPassword,(__bridge id)kSecClass,
            
            service, (__bridge id)kSecAttrService,
            
            service, (__bridge id)kSecAttrAccount,
            
            KEY_ASSESSGROUP, (__bridge id)kSecAttrAccessGroup,
            
            (__bridge id)kSecAttrAccessibleAfterFirstUnlock,(__bridge id)kSecAttrAccessible,
            
            nil];
}

 

//取出

+ (id)load:(NSString *)service {
    
    id ret = nil;
    
    NSMutableDictionary *keychainQuery = [self getKeychainQuery:service];
    
    //Configure the search setting
    
    //Since in our simple case we are expecting only a single attribute to be returned (the password) we can set the attribute kSecReturnData to kCFBooleanTrue
    
    [keychainQuery setObject:(__bridge id)kCFBooleanTrue forKey:(__bridge id)kSecReturnData];
    
    [keychainQuery setObject:(__bridge id)kSecMatchLimitOne forKey:(__bridge id)kSecMatchLimit];
    CFDataRef keyData = NULL;
    
    if (SecItemCopyMatching((__bridge CFDictionaryRef)keychainQuery, (CFTypeRef *)&keyData) == noErr) {
        
        @try {
            
            ret = [NSKeyedUnarchiver unarchiveObjectWithData:(__bridge NSData *)keyData];
            
        } @catch (NSException *e) {
            
            NSLog(@"Unarchive of %@ failed: %@", service, e);
            
        } @finally {
            
        }
        
    }
    
    if (keyData)
        
        CFRelease(keyData);
    
    return ret;
}

//删除
+ (void)delete:(NSString *)service {

    NSMutableDictionary *keychainQuery = [self getKeychainQuery:service];

    SecItemDelete((__bridge CFDictionaryRef)keychainQuery);
}

@end