RestRequest.m

#import "RestRequest.h"
@implementation RestRequest

@synthesize baseURL;
@synthesize http_username;
@synthesize http_password;

- (void) dealloc {
  [baseURL release];
  [http_username release];
  [http_password release];
  [super dealloc];
}
- (id)init {
    //We set ourself as the delegate to reduce code duplication. 
    //This can be overriden in sub-classes if required.    
    [[self class] setDelegate:self];
    //Set your base URL here. In my case this doesn't change.
    //This can be overriden in sub-classes if required.    
    [[self class] setBaseURL:[NSURL URLWithString:@"http://localhost:3000"]];    
    //I use JSON, set to XML if necessary.    
    [[self class] setFormat:HRDataFormatJSON];
    return self;
}
- (id)initWithUsername:(NSString*)username password:(NSString*)password {

  if (self = [super init]) {
    [self init];
    //Set us up to use Basic Auth for all requests.
    [[self class] setBasicAuthWithUsername:username password:password];
  }
  return self;
}

/**
** We require the object parameter to implement the RestRequestDelegate, this insures that our app
** is capable of responding to the restRequestSuccess method.
**/
- (id)processResult:(id)resource with:(NSObject<RestRequestDelegate>*)object {
  //This just passes the result on to the passed in object.
  NSLog(@"noop");
  [object restRequestSuccess:resource];
  return nil;
}
/**
** We require the object parameter to implement the RestRequestDelegate, this insures that our app
** is capable of responding to the restRequestFailure method.
**/
- (id)processFailure:(NSString *)error code:(id)code with:(NSObject<RestRequestDelegate>*)object{
  //This just passes the failure on to the passed in object.
  NSLog(@"noop");
  [object restRequestFailure:code message:error];
  return nil;
}
#pragma httpriot method definitions
/** For simplicity I handle starting/stopping the network activity indicator
here in the base class. This keeps me from having to worry about it in each
place that I make a request.
**/
- (void)restConnection:(NSURLConnection *)connection didReturnResource:(id)resource  object:(id)object {
  NSLog(@"[API] Returned resource [%@] %@ ",[resource class], resource);
  [self processResult:resource with:object];
}

- (void)restConnection:(NSURLConnection *)connection didReceiveResponse:(NSHTTPURLResponse *)response object:(id)object {
  [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;

  NSURL *url = [response URL];
  NSString *urlStr = [url absoluteString];
  NSLog(@"[API] Received response (code %i) URL: %@", [response statusCode], urlStr);
}

- (void)restConnection:(NSURLConnection *)connection didReceiveError:(NSError *)error response:(NSHTTPURLResponse *)response object:(id)object {
  //Recieved a bad status code 404, 500, etc.
  [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
  NSURL *url = [response URL];
  NSString *urlStr = [url absoluteString];
  NSString *code = [NSString stringWithFormat:@"%i", [error code]];
  NSLog(@"[API] Error (code %i) URL: %@", [error code], urlStr);

  NSString *message = [NSString stringWithFormat:@"Sorry, the server is temporarily experiencing technical difficulties (code %i).", [error code]];
  [self processFailure:message code:(id)code with:object];
}

- (void)restConnection:(NSURLConnection *)connection didReceiveParseError:(NSError *)error responseBody:(NSString *)string object:(id)object{

  NSLog(@"[API] Parse error (code %i): %@", [error code], error);
  NSLog(@"[API] Response Body: %@", string);
  NSString *code = [NSString stringWithFormat:@"%i", [error code]];
  NSString *message = [NSString stringWithFormat:@"Sorry, the server is temporarily experiencing technical difficulties (format error)."];
  [self processFailure:message code:code with:object];
}


- (void)restConnection:(NSURLConnection *)connection didFailWithError:(NSError *)error object:(id)object {
  [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
  NSLog(@"[API] Error getting connection: code: %i", [error code]);
  NSString *message = [NSString stringWithFormat:@"Sorry, the server is temporarily experiencing technical difficulties (code %i).", [error code]];
  NSString *code = [NSString stringWithFormat:@"%i", [error code]];
  [self processFailure:message code:code with:object];
}
@end