密码强度判断

提示弱密码无效

1. 密码长度：12345
2. 密码覆盖字符集：12345678
3. 密码规则性：1234abcd

typedef NS_ENUM(UInt32, PasswordStrengthType) {
    PasswordStrengthTypeTooShort,
    PasswordStrengthTypeTooLong,
    PasswordStrengthTypeSingleSet,
    PasswordStrengthTypeMatchList,
    PasswordStrengthTypeValid,
};

@interface PasswordStrengthEvaluator : NSObject
+ (PasswordStrengthEvaluator *)sharedInstance;
- (PasswordStrengthType)checkPasswordStrength:(NSString *)password;
@end

NSString * const kRegexPasswordHasUppercase = @"^(?=.*[A-Z]).*$";
NSString * const kRegexPasswordHasLowercase = @"^(?=.*[a-z]).*$";
NSString * const kRegexPasswordHasNumber = @"^(?=.*[0-9]).*$";
NSString * const kRegexPasswordHasSymbol = @"^(?=.*[!@#$%&_]).*$";

#import "PasswordStrengthEvaluator.h"

@implementation PasswordStrengthEvaluator {
    NSArray *_weakPwdList;
}

+ (PasswordStrengthEvaluator *)sharedInstance
{
    static dispatch_once_t onceToken;
    static PasswordStrengthEvaluator *sharedInstance;
    dispatch_once(&onceToken, ^{
        sharedInstance = [[PasswordStrengthEvaluator alloc] init];
    });
    
    return sharedInstance;
}

- (PasswordStrengthType)checkPasswordStrength:(NSString *)password
{
    if (password.length < 8) return PasswordStrengthTypeTooShort;
    if (password.length > 16) return PasswordStrengthTypeTooLong;
    
    BOOL hasUppercase = [self isPattern:kRegexPasswordHasUppercase validateString:password caseSensitive:YES];
    BOOL hasLowercase = [self isPattern:kRegexPasswordHasLowercase validateString:password caseSensitive:YES];
    BOOL hasNumber = [self isPattern:kRegexPasswordHasNumber validateString:password caseSensitive:YES];
    BOOL hasSymbol = [self isPattern:kRegexPasswordHasSymbol validateString:password caseSensitive:YES];

    if (hasUppercase + hasLowercase + hasNumber + hasSymbol < 2) return PasswordStrengthTypeSingleSet;
    
    for (NSString *weakpwd in _weakPwdList) {
        if ([weakpwd isEqualToString:password]) {
            return PasswordStrengthTypeMatchList;
        };
    }

    return PasswordStrengthTypeValid;
}

- (BOOL)isPattern:(NSString *)pattern validateString:(NSString *)string caseSensitive:(BOOL)caseSensitive
{
    NSError *error = nil;
    NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:pattern options:((caseSensitive) ? 0 : NSRegularExpressionCaseInsensitive) error:&error];

    NSRange textRange = NSMakeRange(0, string.length);
    NSRange matchRange = [regex rangeOfFirstMatchInString:string options:NSMatchingReportProgress range:textRange];
    return matchRange.location != NSNotFound;
}
@end

提示密码强弱等级

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