问题
My previous question was about the problem that I have to login each time for doing web services like posting a link or uploading a picture. Philipe answered that I have to use cookies instead of login process for each request. I found this method for getting cookies:
- (void)getCookies {
NSHTTPURLResponse * response;
NSError * error;
NSMutableURLRequest *request;
request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:@"http://MyWebsite.com/login.php"]
cachePolicy:NSURLRequestReloadIgnoringCacheData
timeoutInterval:120];
NSData * data = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
NSLog(@"%@", [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding]);
NSArray * all = [NSHTTPCookie cookiesWithResponseHeaderFields:[response allHeaderFields] forURL:[NSURL URLWithString:@"http://MyWebsite.com/login.php"]];
NSLog(@"%d", all.count);
for (NSHTTPCookie *cookie in all) {
NSLog(@"Name: %@ : Value: %@", cookie.name, cookie.value);
NSLog(@"Comment: %@ : CommentURL: %@", cookie.comment, cookie.commentURL);
NSLog(@"Domain: %@ : ExpiresDate: %@", cookie.domain, cookie.expiresDate);
NSLog(@"isHTTPOnly: %c : isSecure: %c", cookie.isHTTPOnly, cookie.isSecure);
NSLog(@"isSessionOnly: %c : path: %@", cookie.isSessionOnly, cookie.path);
NSLog(@"portList: %@ : properties: %@", cookie.portList, cookie.properties);
NSLog(@"version: %u", cookie.version);
}
}
I also found this code to use these cookies, but I'm not sure how to use it:
[[NSHTTPCookieStorage sharedHTTPCookieStorage] setCookie:cookies];
Here is my method for POSTing, I am using RestKit API:
- (IBAction)addLinkPressed:(UIButton *)sender {
[RKClient clientWithBaseURLString:@"http://MyWebsite.com"];
NSDictionary* params = [NSDictionary dictionaryWithObjectsAndKeys:
self.linkField.text, @"url",
self.linkTitleField.text, @"title",
self.linkSummaryField.text, @"summary",
nil];
RKRequest *request = [[RKClient sharedClient] post:@"/send_link.php" params:params delegate:self];
[request setUserData:@"sendLink"];
}
Question: Which property of cookies should I store to use it for login information and where should I put it in my code?
回答1:
I solved this issue by some inefficient way. Here is my methodology: First I try to post to the web service and after posting I parse the returning HTML to see if the posting was successful or not. If posting was successful I give an appropriate message to the user that you post successfully but if it was not successful it could have two reasons: First: there were some error during the post execution Second: the user was not logged in. The way that I recognize the differentiation between fist and second error is just parsing the response HTML. Here is the code that I used for this methodology (this is for the time that the user wants to change the password)
- (void)objectLoader:(RKObjectLoader*)objectLoader didFailWithError:(NSError*)error {
NSRange range = [[error localizedDescription] rangeOfString:@"-1012"];
if (range.length > 0){
//First error occurs here
}
RKLogError(@"Hit error: %@", error);
}
- (IBAction)requestToChangePasswordPressed {
MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:self.view animated:YES];
hud.labelText = @"Loading";
[RKClient clientWithBaseURLString:@"http://WebServiceDomain.com"];
NSDictionary* params = [NSDictionary dictionaryWithObjectsAndKeys:
self.oldPasswordField.text, @"oldPassword",
self.passwordNew.text, @"newPassword",
self.confirmPasswordField.text, @"confirmPassword",
nil];
RKRequest *request = [[RKClient sharedClient] post:@"/change_password.php" params:params delegate:self];
[request setUserData:@"changePassword"];
[self.view endEditing:YES];
[MBProgressHUD hideHUDForView:self.view animated:YES];
}
- (void)autoLogin {
[RKClient clientWithBaseURLString:@"http://WebServiceDomain.com"];
[RKObjectManager sharedManager].client=[RKClient sharedClient];
RKParams *parameters = [RKParams params];
[parameters setValue:[[NSUserDefaults standardUserDefaults] objectForKey:@"defaultUsername"] forParam:@"username"];
[parameters setValue:[[NSUserDefaults standardUserDefaults] objectForKey:@"defaultPassword"] forParam:@"password"];
[[RKClient sharedClient] setAuthenticationType:RKRequestAuthenticationTypeHTTP];
// because we have two POSTs and we want to use the same method for both of the for didLoadResponse: we set the UserDate like bellow
RKRequest *request = [[RKClient sharedClient] post:@"/login.php" params:parameters delegate:self];
[request setUserData:@"login"];
}
- (void)request:(RKRequest*)request didLoadResponse:(RKResponse*)response
{
MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:self.view animated:YES];
hud.labelText = @"Loading";
id userData = [request userData];
if ([userData isEqual:@"login"]) {
if ([request isGET]) {
// Handling GET /foo.xml
if ([response isOK]) {
// Success! Let's take a look at the data
NSLog(@"Retrieved XML: %@", [response bodyAsString]);
}
} else if ([request isPOST]) {
// Handling POST /other.json
if ([response isJSON]) {
NSLog(@"Got a JSON response back from our POST!");
}
} else if ([request isDELETE]) {
// Handling DELETE /missing_resource.txt
if ([response isNotFound]) {
NSLog(@"The resource path '%@' was not found.", [request resourcePath]);
}
}
}
else if ([userData isEqual:@"sendLink"]) {
NSData *addLinksHtmlData = response.body;
// 2
TFHpple *addlinksParser = [TFHpple hppleWithHTMLData:addLinksHtmlData];
// 3
NSString *errorLinksXpathQueryString = @"//div[@class='errorBox']/ul/li";
NSArray *errorLinksNodes = [addlinksParser searchWithXPathQuery:errorLinksXpathQueryString];
// 4
NSMutableArray *newErrorLinks = [[NSMutableArray alloc] initWithCapacity:0];
for (TFHppleElement *element in errorLinksNodes) {
// 5
AllModels *errorTitle = [[AllModels alloc] init];
[newErrorLinks addObject:errorTitle];
// 6
errorTitle.errorTitle = [[element firstChild] content];
}
// 8
self.linkErrorObjects = newErrorLinks;
NSString *successLinksXpathQueryString = @"//div[@class='successBox']";
NSArray *successLinksNodes = [addlinksParser searchWithXPathQuery:successLinksXpathQueryString];
// 4
NSMutableArray *newSuccessLinks = [[NSMutableArray alloc] initWithCapacity:0];
for (TFHppleElement *element in successLinksNodes) {
// 5
AllModels *successTitle = [[AllModels alloc] init];
[newSuccessLinks addObject:successTitle];
// 6
successTitle.successTitle = [[element firstChild] content];
}
// 8
self.linkSuccessObjects = newSuccessLinks;
}
else {
NSLog(@"HTTP status code: %d", response.statusCode);
NSLog(@"HTTP status message: %@", [response localizedStatusCodeString]);
NSLog(@"Header fields: %@", response.allHeaderFields);
NSLog(@"Body: %@", response.bodyAsString);
NSData *HtmlData = response.body;
// 2
TFHpple *addParser = [TFHpple hppleWithHTMLData:HtmlData];
// 3
NSString *errorXpathQueryString = @"//div[@class='errorBox']/ul/li";
NSArray *errorNodes = [addParser searchWithXPathQuery:errorXpathQueryString];
// 4
NSMutableArray *newError = [[NSMutableArray alloc] initWithCapacity:0];
for (TFHppleElement *element in errorNodes) {
// 5
AllModels *errorTitle = [[AllModels alloc] init];
[newError addObject:errorTitle];
// 6
errorTitle.errorTitle = [[element firstChild] content];
}
// 8
self.ErrorObjects = newError;
NSString *successXpathQueryString = @"//div[@class='successBox']";
NSArray *successNodes = [addParser searchWithXPathQuery:successXpathQueryString];
// 4
NSMutableArray *newSuccess = [[NSMutableArray alloc] initWithCapacity:0];
for (TFHppleElement *element in successNodes) {
// 5
AllModels *successTitle = [[AllModels alloc] init];
[newSuccess addObject:successTitle];
// 6
successTitle.successTitle = [[element firstChild] content];
}
// 8
self.successObjects = newSuccess;
[self errorCheck];
}
[MBProgressHUD hideHUDForView:self.view animated:YES];
[MBProgressHUD hideHUDForView:self.view animated:YES];
}
- (void)errorCheck {
MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:self.view animated:YES];
hud.labelText = @"Loading";
if(self.errorObjects.count > 0) {
AllModels *errorlink = [self.errorObjects objectAtIndex:0];
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"There is a problem" message:errorlink.errorTitle delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles:nil , nil];
[alert show];
}
else {
if(self.linkErrorObjects.count > 0) {
[self autoLogin];
[self requestToChangePasswordPressed];
}
else {
AllModels *successlink = [self.successObjects objectAtIndex:0];
self.successLabel.hidden = NO;
self.successLabel.text = successlink.successTitle;
NSLog(@"Success Title: %@",successlink.successTitle);
[UIView animateWithDuration:3.0
delay:0.0
options:UIViewAnimationOptionBeginFromCurrentState
animations:^{ self.successLabel.alpha = 0.0; }
completion:^(BOOL fin) { if (fin) [self.successLabel removeFromSuperview]; }];
[self performSelector:@selector(dismissModalViewController) withObject:nil afterDelay:1.0];
}
}
[MBProgressHUD hideHUDForView:self.view animated:YES];
[MBProgressHUD hideHUDForView:self.view animated:YES];
}
来源：https://stackoverflow.com/questions/12546495/how-to-get-cookies-and-use-them-for-other-requests-like-post-ios