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Native Google Reader App for iPhone

I am currently creating my own Google Reader iPhone app, similar to the successful Reeder for iPhone app, but with a full Twitter client built-in.

I have finished the Twitter client, and now I am trying to start the Google Reader client. I looked through several documents and looked at the gdata-object-client samples, but I still can’t figure out what I need to do to perform the same functionality as Reeder.

Basically, I want the user to be able to submit a login screen. The user then passes on their credentials and access token, and all this is done behind the scenes, as is the case with Twitter xAuth. Then I want to click on a view controller that displays a UITableView with all the current unread channels. When the user clicks on the UITableViewCell, a detailed view containing the contents of the messages is accordingly displayed.

Is this possible, and if so, how can I implement these functions? I would appreciate it if people posted “snippets of code” and actually demonstrated how they achieve implementation.

Thanks in advance!

EDIT: I was informed that the Google engine is not needed. However, the question remains the same. How to implement the Google Reader application in my application?

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3 answers

It was that simple. For anyone interested in connecting to the Google Reader API, I did the following.

/*  Google clientLogin API:
     Content-type: application/x-www-form-urlencoded
     Email=userName
     Passwd=password
     accountType=HOSTED_OR_GOOGLE
     service=xapi
     source = @"myComp-myApp-1.0"
     */

    //define our return objects
    BOOL authOK;
    NSString *authMessage = [[NSString alloc] init];
    NSArray *returnArray = nil;
    //begin NSURLConnection prep:
    NSMutableURLRequest *httpReq = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:GOOGLE_CLIENT_AUTH_URL] ];
    [httpReq setTimeoutInterval:30.0];
    //[httpReq setCachePolicy:NSURLRequestReloadIgnoringCacheData];
    [httpReq setHTTPMethod:@"POST"];
    //set headers
    [httpReq addValue:@"Content-Type" forHTTPHeaderField:@"application/x-www-form-urlencoded"];
    //set post body
    NSString *requestBody = [[NSString alloc] 
                             initWithFormat:@"Email=%@&Passwd=%@&service=reader&accountType=HOSTED_OR_GOOGLE&source=%@",
                             gUserString, gPassString, [NSString stringWithFormat:@"%@%d", gSourceString]];

    [httpReq setHTTPBody:[requestBody dataUsingEncoding:NSASCIIStringEncoding]];

    NSHTTPURLResponse *response = nil;
    NSError *error = nil;
    NSData *data = nil;
    NSString *responseStr = nil;
    NSArray *responseLines = nil;
    NSString *errorString;
    //NSDictionary *dict;
    int responseStatus = 0;
    //this should be quick, and to keep same workflow, we'll do this sync.
    //this should also get us by without messing with threads and run loops on Tiger.
    data = [NSURLConnection sendSynchronousRequest:httpReq returningResponse:&response error:&error];

    if ([data length] > 0) {
        responseStr = [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding];
        //NSLog(@"Response From Google: %@", responseStr);
        responseStatus = [response statusCode];
        //dict = [[NSDictionary alloc] initWithDictionary:[response allHeaderFields]];
        //if we got 200 authentication was successful
        if (responseStatus == 200 ) {
            authOK = TRUE;
            authMessage = @"Successfully authenticated with Google. You can now start viewing your unread feeds.";
        }
        //403 = authentication failed.
        else if (responseStatus == 403) {
            authOK = FALSE;
            //get Error code.
            responseLines  = [responseStr componentsSeparatedByString:@"\n"];
            //find the line with the error string:
            int i;
            for (i =0; i < [responseLines count]; i++ ) {
                if ([[responseLines objectAtIndex:i] rangeOfString:@"Error="].length != 0) {
                    errorString = [responseLines objectAtIndex:i] ;
                }
            }

            errorString = [errorString stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
            /*
             Official Google clientLogin Error Codes:
             Error Code Description
             BadAuthentication  The login request used a username or password that is not recognized.
             NotVerified    The account email address has not been verified. The user will need to access their Google account directly to resolve the issue before logging in using a non-Google application.
             TermsNotAgreed The user has not agreed to terms. The user will need to access their Google account directly to resolve the issue before logging in using a non-Google application.
             CaptchaRequired    A CAPTCHA is required. (A response with this error code will also contain an image URL and a CAPTCHA token.)
             Unknown    The error is unknown or unspecified; the request contained invalid input or was malformed.
             AccountDeleted The user account has been deleted.
             AccountDisabled    The user account has been disabled.
             ServiceDisabled    The user access to the specified service has been disabled. (The user account may still be valid.)
             ServiceUnavailable The service is not available; try again later.
             */

            if ([errorString  rangeOfString:@"BadAuthentication" ].length != 0) {
                authMessage = @"Please Check your Username and Password and try again.";
            }else if ([errorString  rangeOfString:@"NotVerified"].length != 0) {
                authMessage = @"This account has not been verified. You will need to access your Google account directly to resolve this";
            }else if ([errorString  rangeOfString:@"TermsNotAgreed" ].length != 0) {
                authMessage = @"You have not agreed to Google terms of use. You will need to access your Google account directly to resolve this";
            }else if ([errorString  rangeOfString:@"CaptchaRequired" ].length != 0) {
                authMessage = @"Google is requiring a CAPTCHA response to continue. Please complete the CAPTCHA challenge in your browser, and try authenticating again";
                //NSString *captchaURL = [responseStr substringFromIndex: [responseStr rangeOfString:@"CaptchaURL="].length]; 
                //either open the standard URL in a browser, or show a custom sheet with the image and send it back...
                //parse URL to append to GOOGLE_CAPTCHA_URL_PREFIX
                //but for now... just launch the standard URL.
                //[[NSWorkspace sharedWorkspace] openURL:[NSURL URLWithString:GOOGLE_CAPTCHA_STANDARD_UNLOCK_URL]];         
            }else if ([errorString  rangeOfString:@"Unknown" ].length != 0) {
                authMessage = @"An Unknow error has occurred; the request contained invalid input or was malformed.";
            }else if ([errorString  rangeOfString:@"AccountDeleted" ].length != 0) {
                authMessage = @"This user account previously has been deleted.";
            }else if ([errorString  rangeOfString:@"AccountDisabled" ].length != 0) {
                authMessage = @"This user account has been disabled.";
            }else if ([errorString  rangeOfString:@"ServiceDisabled" ].length != 0) {
                authMessage = @"Your access to the specified service has been disabled. Please try again later.";
            }else if ([errorString  rangeOfString:@"ServiceUnavailable" ].length != 0) {
                authMessage = @"The service is not available; please try again later.";
            }

        }//end 403 if

    }
    //check most likely: no internet connection error:
    if (error != nil) {
        authOK = FALSE;
        if ( [error domain]  == NSURLErrorDomain) {
            authMessage = @"Could not reach Google.com. Please check your Internet Connection";
        }else {
            //other error
            authMessage = [authMessage stringByAppendingFormat:@"Internal Error. Please contact notoptimal.net for further assistance. Error: %@", [error localizedDescription] ];
        }
    }
    //NSLog (@"err localized description %@", [error localizedDescription]) ;
    //NSLog (@"err localized failure reasons %@", [error localizedFailureReason]) ;
    //NSLog(@"err code  %d", [error code]) ;
    //NSLog (@"err domain %@", [error domain]) ;


    UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Authentication" message:authMessage delegate:self cancelButtonTitle:@"Okay" otherButtonTitles:nil];
    [alertView show];
    [alertView release];

    [gUserString    release];
    [gPassString    release];
    [gSourceString  release];

    [authMessage    release];

}

}

Obviously, I used my own delegates, etc., but this is a common need / feeling that I brought to my application.

I am currently working on pulling out unread feeds / elements in a UITableView for display in my RootViewController. I will update this with additional information.

Thanks to all those who tried to help: D

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. , , . Btw , / the0rkus - . , :

NSString *gUserString = @"yourlogin@gmail.com";
NSString *gPassString = @"yourpassword";
NSString *GOOGLE_CLIENT_AUTH_URL = @"https://www.google.com/accounts/ClientLogin?client=YourClient";
NSString *gSourceString = @"YourClient";
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Source: https://habr.com/ru/post/1765942/

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