Marking items as read / unread in iphone google reader app - iphone

Question

I am developing an app using data from google reader's API and using GData for login.
I want to be able to mark a post inside a table cell as read / unread, but am finding the fact that this is all mainly undocumented hard to work out a solution, any ideas / links?
Here is the code for the mark read button:
//Get the token
NSString *tokenString = [NSString stringWithFormat:#"https://www.google.com/reader/api/0/token"];
NSURL *tokenURL = [NSURL URLWithString:tokenString];
NSMutableURLRequest *tokenRequest = [NSMutableURLRequest requestWithURL:tokenURL];
NSString *tokenStringResult;
NSArray *listItems;
NSError *tokenError = nil;
NSURLResponse *tokenResponse = nil;
NSData *tokenData = [NSURLConnection sendSynchronousRequest:tokenRequest
returningResponse:&tokenResponse
error:&tokenError];
if (tokenData)
{
tokenStringResult = [[NSString alloc] initWithData:tokenData encoding:NSUTF8StringEncoding];
listItems = [tokenStringResult componentsSeparatedByString:#"/"];
}
else
{
NSLog(#"tokenError = %#", tokenError);
}
// Mark it as read
NSString *readerURLString = [NSString stringWithFormat:#"http://www.google.com/reader/api/0/edit-tag?a=user/-/state/com.google/read&async=true&s=feed/%#&i=%#&T=%#", siteLink, postID, [listItems lastObject]];
NSURL *readerURL = [NSURL URLWithString:readerURLString];
NSMutableURLRequest *readerRequest = [NSMutableURLRequest requestWithURL:readerURL];
[mAuth authorizeRequest:readerRequest];
NSError *error = nil;
NSURLResponse *response = nil;
NSData *data = [NSURLConnection sendSynchronousRequest:readerRequest
returningResponse:&response
error:&error];
if (data)
{
NSHTTPURLResponse * httpResponse = (NSHTTPURLResponse *) response;
assert( [httpResponse isKindOfClass:[NSHTTPURLResponse class]] );
NSLog(#"response.allHeaderFields = %#", [httpResponse allHeaderFields]);
NSLog(#"response.statusCode = %i", [httpResponse statusCode]);
}
the log from this is:
response.statusCode = {
"Cache-Control" = "private, max-age=0";
"Content-Length" = 1334;
"Content-Type" = "text/html; charset=UTF-8";
Date = "Fri, 21 Jan 2011 03:49:07 GMT";
Expires = "Fri, 21 Jan 2011 03:49:07 GMT";
Server = GSE;
"X-Content-Type-Options" = nosniff;
"X-Frame-Options" = SAMEORIGIN;
"X-Reader-Google-Version" = "527-000";
"X-Reader-User" = 01940378872835844713;
"X-Xss-Protection" = "1; mode=block";
}
response.statusCode = 400

Answer 1

So through alot of trial and error I've got it working.
EDIT - Added Auth code
NSString *GOOGLE_CLIENT_AUTH_URL = #"https://www.google.com/accounts/ClientLogin?client=SomeName";
NSString *gSourceString = #"SomeName";
NSMutableURLRequest *httpReq = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:GOOGLE_CLIENT_AUTH_URL]];
[httpReq setTimeoutInterval:30.0];
[httpReq setCachePolicy:NSURLRequestReloadIgnoringCacheData];
[httpReq setHTTPMethod:#"POST"];
[httpReq addValue:#"application/x-www-form-urlencoded" forHTTPHeaderField:#"Content-Type"];
NSString *requestBody = [[NSString alloc] initWithFormat:#"Email=%#&Passwd=%#&service=reader&accountType=HOSTED_OR_GOOGLE&source=%#", userString, passwordString, [NSString stringWithFormat:#"%#%d", gSourceString]];
[httpReq setHTTPBody:[requestBody dataUsingEncoding:NSASCIIStringEncoding]];
[requestBody release];
NSHTTPURLResponse *response = nil;
NSData *data = nil;
NSString *responseStr = nil;
NSArray *responseLines = nil;
int responseStatus = 0;
data = [NSURLConnection sendSynchronousRequest:httpReq returningResponse:&response error:&error];
[httpReq release];
if ([data length] > 0)
{
responseStr = [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding];
responseStatus = [response statusCode];
if (responseStatus == 200 )
{
authOK = TRUE;
NSLog(#"Successfully authenticated with Google.");
NSArray *authLines = nil;
authLines = [responseStr componentsSeparatedByString:#"\n"];
int j;
for (j =0; j < [authLines count]; j++ )
{
if ([[authLines objectAtIndex:j] rangeOfString:#"Auth="].length != 0) {
NSMutableString *teststring = [NSMutableString stringWithString:[authLines objectAtIndex:j]];
[teststring replaceCharactersInRange:NSMakeRange(0,4) withString:#"auth"];
authString = teststring;
}
}
}
}
NSString *auth = [[NSString alloc] initWithString: [NSString stringWithFormat:#"GoogleLogin %#", authString]];
NSDictionary *createHeader = [[NSDictionary dictionaryWithObjectsAndKeys:#"www.google.com", #"Host", #"EditApp", #"User-Agent", #"gzip, deflate", #"Accept-Encoding", auth, #"Authorization", nil]retain];
[auth release];
NSURL *url =[NSURL URLWithString:#"http://www.google.com/reader/api/0/token?client=EditApp"];
NSData *recieveData;
NSMutableURLRequest *urlRequest = [[NSMutableURLRequest alloc]initWithURL:url];
[urlRequest setHTTPMethod:#"GET"];
[urlRequest setAllHTTPHeaderFields:createHeader];
NSURLResponse *response;
NSError *error;
recieveData = [NSURLConnection sendSynchronousRequest:urlRequest returningResponse:&response error:&error];
// Get token
NSString *pretokenString = [[NSString alloc] initWithData:recieveData encoding:NSASCIIStringEncoding];
tokenString = [pretokenString substringWithRange:NSMakeRange(2, [pretokenString length]-2)];
[pretokenString release];
[urlRequest release];
NSMutableURLRequest *thttpReq = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:#"http://www.google.com/reader/api/0/edit-tag?"]];
[thttpReq setTimeoutInterval:30.0];
[thttpReq setHTTPMethod:#"POST"];
NSString *authHeader = [NSString stringWithFormat:#"GoogleLogin %#", authString];
[thttpReq addValue:authHeader forHTTPHeaderField:#"Authorization"];
[thttpReq addValue:#"Content-Type" forHTTPHeaderField:#"application/x-www-form-urlencoded"];
// siteLink is the url of the feed
// googlePostID is the id from the XML output: tag:google.com,2005:reader/item/e3345c69e174bdec
NSString *trequestBody = [[NSString alloc] initWithFormat:#"a=user/-/state/com.google/read&ac=edit-tags&s=feed/%#&i=%#&T=%#", siteLink, googlePostID, tokenString];
[thttpReq setHTTPBody:[trequestBody dataUsingEncoding:NSASCIIStringEncoding]];
NSURLConnection *con = [[NSURLConnection alloc]
initWithRequest:thttpReq
delegate:self
startImmediately:NO];
[con scheduleInRunLoop:[NSRunLoop currentRunLoop]
forMode:NSRunLoopCommonModes];
[con start];

Answer 2

If you are familiar with php I wrote a tutorial on using the google readi api recently.
http://mobile.tutsplus.com/tutorials/mobile-web-apps/building-a-mobile-web-application-with-the-google-reader-api/
One thing I notice is that in this string
http://www.google.com/reader/api/0/edit-tag/a=user/-/state/com.google/read&async=true&s=feed/%#&i=%#
Your not including the "edit" token the url should look like this. and you need the ? after edit-tag.
http://www.google.com/reader/api/0/edit-tag?a=user/-/state/com.google/read&async=true&s=feed/%#&i=%#&T=%#
You can get the "edit" token from this link once you have the user logged in, https://www.google.com/reader/api/0/token
Sorry can't help with objective-c stuff.