New Networking

RGJSONResponseTransformer.m

//
//  RGJSONResponseTransformer.m
//  RapGenius
//
//  Created by Soroush Khanlou on 1/20/15.
//  Copyright (c) 2015 Genius. All rights reserved.
//

#import "RGJSONResponseTransformer.h"
#import <NSObject+JSON.h>
#import <NSString+DataConversion.h>

@implementation RGJSONResponseTransformer

- (id)transformResponse:(NSURLResponse *)response andData:(NSData *)data {
    return data.stringRepresentation.objectFromJSONString;
}

@end

RGLoginRequest.m

//
//  RGLoginRequest.m
//  RapGenius
//
//  Created by Soroush Khanlou on 1/20/15.
//  Copyright (c) 2015 Genius. All rights reserved.
//

#import "RGLoginRequest.h"
#import "RGJSONResponseTransformer.h"

@implementation RGLoginRequest

- (instancetype)initWithUserName:(NSString *)username password:(NSString *)password {
    if (!username || !password) {
        self = nil;
        return nil;
    }
    self = [super init];
    if (!self) return nil;
    
    _username = username;
    _password = password;
    
    return self;
}

- (NSString *)method {
    return @"POST";
}

- (NSURL *)baseURL {
    return [NSURL URLWithString:@"https://api.genius.com"];
}

- (NSString *)path {
    return @"/sessions";
}

- (NSDictionary *)parameters {
    return @{
             @"user":
                 @{
                     @"login": self.username,
                     @"password": self.password,
                     }
             };
}

- (NSDictionary *)headers {
    return @{
             @"Accept": @"application/json",
             @"Content-Type": @"application/json",
             };
}

- (id<RGResponseTransformer>)transformer {
    return [RGJSONResponseTransformer new];
}

@end

RGRequestSender.m

//
//  RGRequestSender.m
//  RapGenius
//
//  Created by Soroush Khanlou on 1/20/15.
//  Copyright (c) 2015 Genius. All rights reserved.
//

#import "RGRequestSender.h"
#import <NSObject+JSON.h>
#import <NSString+DataConversion.h>
#import "RGSafeRequestTemplate.h"

@implementation RGRequestSender

- (instancetype)initWithURLSession:(NSURLSession *)session {
    self = [super init];
    if (!self) return nil;
    
    _session = session;
    
    return self;
}

- (instancetype)init {
    return [self initWithURLSession:[NSURLSession sharedSession]];
}

- (void)sendRequestWithURLRequestTemplate:(id<RGRequestTemplate>)unsafeTemplate target:(id<RGRequestTarget>)target {
    RGSafeRequestTemplate *safeTemplate = [[RGSafeRequestTemplate alloc] initWithTemplate:unsafeTemplate];

    NSURLRequest *request = [self requestWithTemplate:safeTemplate] ;
    [[self.session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
        dispatch_async(dispatch_get_main_queue(), ^{
            if (error) {
                if ([target respondsToSelector:@selector(requestFailedWithError:)]) {
                    [target requestFailedWithError:error];
                }
            } else {
                if ([target respondsToSelector:@selector(requestCompletedWithResult:)]) {
                    id result;
                    id<RGResponseTransformer> transformer = [safeTemplate transformer];
                    if (transformer) {
                        result = [transformer transformResponse:response andData:data];
                    } else {
                        result = data;
                    }
                    [target requestCompletedWithResult:result];
                }
            }
        });
    }] resume];
}

- (NSURLRequest *)requestWithTemplate:(RGSafeRequestTemplate *)safeTemplate {
    NSMutableURLRequest *URLRequest = [[NSMutableURLRequest alloc] init];
    URLRequest.HTTPMethod = [safeTemplate method];
    URLRequest.HTTPBody = [safeTemplate parameters].JSONString.dataRepresentation;
    NSURLComponents *URLComponents = [NSURLComponents componentsWithURL:[safeTemplate baseURL] resolvingAgainstBaseURL:YES];
    NSString *path = [URLComponents.path stringByAppendingString:[safeTemplate path]];
    URLComponents.path = path;
    URLRequest.URL = URLComponents.URL;
    [[safeTemplate headers] enumerateKeysAndObjectsUsingBlock:^(NSString *fieldName, NSString *value, BOOL *stop) {
        [URLRequest addValue:value forHTTPHeaderField:fieldName];
    }];
    return URLRequest;
}

@end

RGSafeRequestTemplate.m

//
//  RGSafeRequestTemplate.m
//  RapGenius
//
//  Created by Soroush Khanlou on 1/20/15.
//  Copyright (c) 2015 Genius. All rights reserved.
//

#import "RGSafeRequestTemplate.h"

@implementation RGSafeRequestTemplate

- (instancetype)initWithTemplate:(id<RGRequestTemplate>)template {
    self = [super init];
    if (!self) return nil;
    
    _unsafeTemplate = template;
    
    return self;
}

- (NSString *)method {
    if ([self.unsafeTemplate respondsToSelector:@selector(method)]) {
        return [self.unsafeTemplate method];
    }
    return nil;
}

- (NSURL *)baseURL {
    if ([self.unsafeTemplate respondsToSelector:@selector(baseURL)]) {
        return [self.unsafeTemplate baseURL];
    }
    return nil;
}

- (NSString *)path {
    if ([self.unsafeTemplate respondsToSelector:@selector(path)]) {
        return [self.unsafeTemplate path];
    }
    return nil;
}

- (NSDictionary *)parameters {
    if ([self.unsafeTemplate respondsToSelector:@selector(parameters)]) {
        return [self.unsafeTemplate parameters];
    }
    return nil;
}

- (NSDictionary *)headers {
    if ([self.unsafeTemplate respondsToSelector:@selector(headers)]) {
        return [self.unsafeTemplate headers];
    }
    return nil;
}

- (id<RGResponseTransformer>)transformer {
    if ([self.unsafeTemplate respondsToSelector:@selector(transformer)]) {
        return [self.unsafeTemplate transformer];
    }
    return nil;
}

@end