How to implement refresh token in ios - ios

Question

only some api call needs the token. and when 401 occurs refresh token call will be taken place.and for each call the token is refreshing. how to execute more than 1 api synchronously when 401 occurs

Answer 1

This is upto you, how you design the flow but I did almost same problem like following in Objective C
Call method of like in my case userProfileGETRequest
Before calling userProfileGETRequest Check date if token gets expired(in your case may be status code == 401)
If Token not expired simply call API in my case userProfileAPI with last token
If Token Expired then Call Refresh token and with Success and Failure Callback
If successful refresh token, call the userProfileAPI API with updated refresh token.
+ (void) userProfileGETRequest:(NSDictionary *)headerParams urlQuery: (NSString*)action parameters:(NSDictionary*)params docOpenPassword: (NSString*)password docOpenOtp: (NSString*)otp
onComplete:(void (^)(id json, id code, id url))successBlock
onError:(void (^)(id error, id code, id url))errorBlock {if ([[SingletonSDK sharedInstance] isTokenExpired:[NSDate date]]) {[self refereshToken:nil :^(id json, id code) {
[[SingletonSDK sharedInstance] handleLoginResponseObject:json];
[self userProfileAPI:headerParams urlQuery:action parameters:params
onComplete:^(id json, id code, id url) {
successBlock(json, code, url);
} onError:^(id error, id code, id url) {
errorBlock(error, code, url);
}];
} onError:^(id error, id code) {
[[SingletonSDK sharedInstance] hideProgessHud];
return ;
}];
}
} else {
[self userProfileAPI:headerParams urlQuery:action parameters:params
onComplete:^(id json, id code, id url) {
successBlock(json, code, url);
} onError:^(id error, id code, id url) {
errorBlock(error, code, url);
}];
}}
//userProfileAPI Methods
+ (void) userProfileAPI:(NSDictionary *)headerParams urlQuery: (NSString*)action parameters:(NSDictionary*)params
onComplete:(void (^)(id json, id code, id url))successBlock
onError:(void (^)(id error, id code, id url))errorBlock
{
NSString *authorizationValue = [self setAuthorizationValue:action];
NSString *language = [self editedLanguageNameAsApiRequired];
AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
//set headers values
[manager.requestSerializer setValue:#"application/json" forHTTPHeaderField:#"Accept"];
[manager.requestSerializer setValue:language forHTTPHeaderField:#"Accept-Language"];
[manager.requestSerializer setValue:authorizationValue forHTTPHeaderField:#"authorization"];
[manager GET:action parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {
NSLog(#"getRequest response success");
NSString *url = [[[operation response] URL] absoluteString];
NSInteger statusCode = [operation.response statusCode];
NSNumber *statusObject = [NSNumber numberWithInteger:statusCode];
successBlock(responseObject, statusObject, url);
}
failure:^(AFHTTPRequestOperation *operation, NSError *error)
{
NSString *url = [[[operation response] URL] absoluteString];
NSInteger statusCode = [operation.response statusCode];
NSNumber *statusObject = [NSNumber numberWithInteger:statusCode];
if ([self takeDesiredActionIfAccessTokenExpired:statusCode]) {
return ;
}
id responseObject = operation.responseData;
id json = nil;
id errorMessage = nil;
if ([statusObject integerValue] == 404) {
errorMessage = [[SingletonSDK sharedInstance] getStringValueFromLanguageKey: COMMON_ERROR_SHARED_PREFERENCES];//NSLocalizedString(COMMON_ERROR_RESOURCE_NOT_FOUND, nil);
} else {
if (responseObject) {
json = [NSJSONSerialization JSONObjectWithData:responseObject options:kNilOptions error:&error];
errorMessage = [(NSDictionary*)json objectForKey:#"Message"];
}else{
json = [error.userInfo objectForKey:NSLocalizedDescriptionKey];
errorMessage = json;
}
}
if(![errorMessage isKindOfClass:[NSString class]]){
errorMessage = [[SingletonSDK sharedInstance] getStringValueFromLanguageKey: COMMON_ERROR_MSG] ; //NSLocalizedString(COMMON_ERROR_MSG, nil);
}
}];
}