はじめに

概要

はじめに、NSURLSessionでのプロキシ通信の実装例を示します
つぎに、AFNetworking 2.xでのプロキシ通信の実装例を示します
最後に、補足としてPACファイルからプロキシ設定を取得する実装例を示します
実装例は、Mac OS X Yosemite 10.10.3で動作確認しています

AFNetworkingの補足

AFNetworking 1.xではNSURLConnectionを使っており、NSURLConnectionはプロキシをサポートしていないため、CFNetwork系のAPIを使って独自に実装する必要があるようです
一方、AFNetworking 2.xではNSURLSessionを使え、NSURLSessionはNSURLSessionConfiguration.connectionProxyDictionaryでプロキシを指定できます
参考: ios - how to set proxy details using AFNetworking - Stack Overflow

こちらも参照してください

Cocoa - NSURLSessionで任意のProxyを使う - Qiita

注意

AFNetworking 2.xは、iOS 6以降、Mac OS X 10.8以降をサポートしています
AFNetworking - Requirements

(NSURLSession) プロキシ通信の実装例

NSURLSession``NSURLSessionDataTaskを直接使用する場合の実装例です
実行環境: OS X Yosemite 10.10.3
Xcode 6.3.2


- (IBAction)proxyConnectAction:(id)sender {  
//  NSDictionary *httpProxy = @{(id)kCFNetworkProxiesHTTPEnable:  @(1),
//                            (id)kCFStreamPropertyHTTPProxyHost: host,
//                            (id)kCFStreamPropertyHTTPProxyPort: port};
  
  // 注意: iOSでは`HTTPS`のkeyが定義されていません
  NSDictionary *httpsProxy = @{(id)kCFNetworkProxiesHTTPSEnable:    @(1),
                               (id)kCFStreamPropertyHTTPSProxyHost: @"127.0.0.1",
                               (id)kCFStreamPropertyHTTPSProxyPort: @(8888)};

  NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
  configuration.connectionProxyDictionary = httpsProxy;
  NSURL *url = [NSURL URLWithString:@"https://www.example.com/foobar.png"];
  NSURLSession *session = [NSURLSession sessionWithConfiguration:configuration];
  NSURLSessionDataTask *dataTask = [session dataTaskWithURL:url completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
    NSLog(@"response: %@", response);
    NSLog(@"data length: %ld", data.length);
    if (error) {
      NSLog(@"error:%@", error);
    }
  }];
  [dataTask resume];
}

(AFNetworking 2.x) プロキシ通信の実装例

AFNetworkingのAFHTTPSessionManagerを使用する場合の実装例です
実行環境: OS X Yosemite 10.10.3
Xcode 6.3.2
AFNetworking 2.5.4

RestClientの例

RestClient.h

# import <Foundation/Foundation.h>

@interface RestClient : NSObject
@property (copy, nonatomic) NSURL *baseURL;
@property (copy, nonatomic) NSDictionary *proxyDictionary;
@property (nonatomic) BOOL allowInvalidCertificates; // For debugging (Default: NO)

- (instancetype)initWithBaseURL:(NSURL *)baseURL;
- (instancetype)initWithBaseURL:(NSURL *)baseURL proxyDictionary:(NSDictionary *)proxyDictionary;

- (void)getWithPath:(NSString *)path
         parameters:(NSDictionary *)parameters
            success:(void (^)(id responseObject))success
            failure:(void (^)(NSError *error))failure;

@end

initWithBaseURL:sessionConfiguration:を使って、AFHTTPSessionManagerを作成します
NSURLSessionConfiguration.connectionProxyDictionaryに、プロキシの情報を入れたNSDictionaryを指定します

RestClient.m

# import "RestClient.h"
# import <AFNetworking/AFNetworking.h>

@interface RestClient ()
@property (strong) AFHTTPSessionManager *httpSessionManager;

@end

@implementation RestClient

- (instancetype)initWithBaseURL:(NSURL *)baseURL {
  self = [super init];
  if (!self) {
    return nil;
  }
  
  self.baseURL = baseURL;
  
  return self;
}

- (instancetype)initWithBaseURL:(NSURL *)baseURL proxyDictionary:(NSDictionary *)proxyDictionary {
  self = [self initWithBaseURL:baseURL];
  if (!self) {
    return nil;
  }
  
  self.proxyDictionary = proxyDictionary;
  
  return self;
}

- (AFHTTPSessionManager *)_sessionManager {
  AFHTTPSessionManager *manager = self.httpSessionManager;
  
  if (!manager) {
    // Configure AFHTTPSessionManager
    NSURLSessionConfiguration *sessionConfig = [NSURLSessionConfiguration defaultSessionConfiguration];
    sessionConfig.connectionProxyDictionary = self.proxyDictionary;
    
    manager = [[AFHTTPSessionManager alloc] initWithBaseURL:self.baseURL sessionConfiguration:sessionConfig];
    manager.securityPolicy.allowInvalidCertificates = self.allowInvalidCertificates;
    
    // Set Serializer
    manager.requestSerializer  = [AFJSONRequestSerializer serializer];
    manager.responseSerializer = [AFJSONResponseSerializer serializer];
    
    // Configure JSON Request Serializer
    manager.requestSerializer.timeoutInterval = 20.0f;
    manager.requestSerializer.cachePolicy     = NSURLRequestReloadIgnoringCacheData;
    
    // Set default header to requestSerializer
    [manager.requestSerializer setValue:@"application/json" forHTTPHeaderField:@"Accept"];
    [manager.requestSerializer setValue:@"application/json" forHTTPHeaderField:@"content-type"];
    
    // Configure JSON Response Serializer
    ((AFJSONResponseSerializer *)(manager.responseSerializer)).readingOptions |= NSJSONReadingAllowFragments;
    self.httpSessionManager = manager;
  }
  
  return manager;
}

- (void)getWithPath:(NSString *)path
         parameters:(NSDictionary *)parameters
            success:(void (^)(id responseObject))success
            failure:(void (^)(NSError *error))failure {
  AFHTTPSessionManager *manager = [self _sessionManager];
  manager.responseSerializer = [AFHTTPResponseSerializer serializer];
  [manager GET:path parameters:parameters success:^(NSURLSessionDataTask *task, id responseObject) {
    NSLog(@"task:%@", task);
    success(responseObject);
  } failure:^(NSURLSessionDataTask *task, NSError *error) {
    NSLog(@"task:%@", task);
    failure(error);
  }];
}

@end

RestClientを使う側

Example.m


// [proxy] https://127.0.0.1:8888
NSDictionary *httpsProxy = @{(id)kCFNetworkProxiesHTTPSEnable:    @(1),
                             (id)kCFStreamPropertyHTTPSProxyHost: @"127.0.0.1",
                             (id)kCFStreamPropertyHTTPSProxyPort: @(8888)};

NSURL *baseURL = [self _baseURL];
NSString *path = [self _path];

RestClient *client = [[RestClient alloc] initWithBaseURL:baseURL proxyDictionary:httpsProxy];
[client getWithPath:path parameters:nil success:^(id responseObject) {
  NSData *data = (NSData *)responseObject;
  NSImage *image = [[NSImage alloc] initWithData:data];
  self.imageView.image = image;
} failure:^(NSError *error) {
  NSLog(@"error: %@", error);
  self.imageView.image = nil;
}];

(補足) PACファイルからプロキシ設定を取得する

システム環境設定

システム環境設定＞ネットワーク＞任意のアダプタ＞プロキシでPACファイルを指定した場合

実装例

実行環境: OS X Yosemite 10.10.3
Xcode 6.3.2
CoreFoundationのCFNetworkCopyProxiesForAutoConfigurationScript()使うと、これから接続するURLに該当するプロキシの情報を取得できます


- (void)_proxiesWithPACScriptURL:(NSURL *)pacScriptURL intendedURL:(NSURL *)intendedURL {
  if (!pacScriptURL || !intendedURL) {
    return;
  }
  
  NSError *error = nil;
  NSString *script;
  
  script = [NSString stringWithContentsOfURL:pacScriptURL usedEncoding:NULL error:&error];
  if (error) {
    NSLog(@"error: %@", error);
    return;
  }
  
  CFErrorRef cfErrorRef = NULL;
  NSArray *proxies = (__bridge NSArray *)CFNetworkCopyProxiesForAutoConfigurationScript((__bridge CFStringRef)script, (__bridge CFURLRef)intendedURL, &cfErrorRef);
  if (cfErrorRef || !proxies.count) {
    NSError *error = (__bridge NSError *)cfErrorRef;
    NSLog(@"error: %@", error);
    return;
  }
  
  NSLog(@"proxies: %@", proxies);
}

- (IBAction)getProxyInfoAction:(id)sender {
  CFDictionaryRef proxies = SCDynamicStoreCopyProxies(NULL);
  NSDictionary *config = (__bridge NSDictionary *)proxies;
  
  NSLog(@"______________________");
  NSLog(@"kSCPropNetProxiesProxyAutoDiscoveryEnable: %@", config[(id)kSCPropNetProxiesProxyAutoDiscoveryEnable]);
  NSLog(@"kSCPropNetProxiesProxyAutoConfigEnable   : %@", config[(id)kSCPropNetProxiesProxyAutoConfigEnable]);
  NSLog(@"kSCPropNetProxiesProxyAutoConfigURLString: %@", config[(id)kSCPropNetProxiesProxyAutoConfigURLString]);
  
  NSLog(@"kSCPropNetProxiesHTTPEnable  : %@", config[(id)kSCPropNetProxiesHTTPEnable]);
  NSLog(@"kSCPropNetProxiesHTTPPort    : %@", config[(id)kSCPropNetProxiesHTTPPort]);
  NSLog(@"kSCPropNetProxiesHTTPSEnable : %@", config[(id)kSCPropNetProxiesHTTPSEnable]);
  NSLog(@"kSCPropNetProxiesHTTPSPort   : %@", config[(id)kSCPropNetProxiesHTTPSPort]);
  NSLog(@"______________________");
  
  NSURL *pacScriptURL = [NSURL URLWithString:config[(id)kSCPropNetProxiesProxyAutoConfigURLString]];
  if (pacScriptURL) {
    NSURL *intendedURL = [NSURL URLWithString:@"https://www.apple.com"];
    [self _proxiesWithPACScriptURL:pacScriptURL intendedURL:intendedURL];
  }
}

PACファイルの例

function FindProxyForURL(url, host) {
  if ( isInNet( host, "127.0.0.1", "255.255.255.255" )) {
    return "DIRECT";
  }
  else if ( dnsDomainIs( host, "beta.example.com") ) {
    return "PROXY 127.0.0.1:8888"
  }
  else {
    return "PROXY 127.0.0.1:8888"
  }
}

実行結果

ProxyInfo[71363:4147289] ______________________
ProxyInfo[71363:4147289] kSCPropNetProxiesProxyAutoDiscoveryEnable: (null)
ProxyInfo[71363:4147289] kSCPropNetProxiesProxyAutoConfigEnable   : 1
ProxyInfo[71363:4147289] kSCPropNetProxiesProxyAutoConfigURLString: http://localhost:4567/proxy4.pac
ProxyInfo[71363:4147289] kSCPropNetProxiesHTTPEnable  : 0
ProxyInfo[71363:4147289] kSCPropNetProxiesHTTPPort    : (null)
ProxyInfo[71363:4147289] kSCPropNetProxiesHTTPSEnable : 0
ProxyInfo[71363:4147289] kSCPropNetProxiesHTTPSPort   : (null)
ProxyInfo[71363:4147289] ______________________
ProxyInfo[71363:4147289] proxies: (
        {
        kCFProxyHostNameKey = "127.0.0.1";
        kCFProxyPortNumberKey = 8888;
        kCFProxyTypeKey = kCFProxyTypeHTTPS;
    }
)

参照