iOS - Auth验证jwt解析(decode)token原生方法

jwtStr

jsonDict

-(id)jwtDecodeWithJwtString:(NSString *)jwtStr{

NSArray * segments = [jwtStr componentsSeparatedByString:@"."];
NSString * base64String = [segments objectAtIndex:1];

int requiredLength = (int)(4 *ceil((float)[base64String length]/4.0));
int nbrPaddings = requiredLength - (int)[base64String length];
if(nbrPaddings > 0){
NSString * pading = [[NSString string] stringByPaddingToLength:nbrPaddings withString:@"=" startingAtIndex:0];
base64String = [base64String stringByAppendingString:pading];
}
base64String = [base64String stringByReplacingOccurrencesOfString:@"-" withString:@"+"];
base64String = [base64String stringByReplacingOccurrencesOfString:@"_" withString:@"/"];
NSData * decodeData = [[NSData alloc] initWithBase64EncodedData:base64String options:0];
NSString * decodeString = [[NSString alloc] initWithData:decodeData encoding:NSUTF8StringEncoding];
NSDictionary * jsonDict = [NSJSONSerialization JSONObjectWithData:[decodeString dataUsingEncoding:NSUTF8StringEncoding] options:0 error:nil];
return jsonDict;
}