网络框架

NSURLProtocol

作用
- 忽略网络请求使用本地缓存
- 重定向网络请求
- 改变request的请求头

使用

子类
实现方法

   canInitWithRequest:(NSURLRequest *)request
    + (NSURLRequest *)canonicalRequestForRequest:(NSURLRequest *)request
    - (void)startLoading
     - (void)stopLoading
    + (NSURLRequest *)canonicalRequestForRequest:(NSURLRequest *)request

拦截你需要拦截的地址
startLoading 进行修改
```
self.client URLProtocol
```

注意还有一个死循环

HTTPCookie

cookie获取

[NSHTTPCookieStorage sharedHTTPCookieStorage].cookies

cookie删除

[[NSHTTPCookieStorage sharedHTTPCookieStorage] deleteCookie:cookice];

cookie添加

[[NSHTTPCookieStorage sharedHTTPCookieStorage] setCookie:newcookie];
request.allHTTPHeaderFields = headerDict

WK的cookie特殊性

//第一次进行JS注入
[contoller addUserScript:[[WKCookieManager shareManager] futhureCookieScript]];
[self cookieAppendRequest]
//防止跨域丢失
cookie[[WKCookieManager shareManager] fixNewRequestCookieWithRequest:navigationAction.request];

代码部分

//获取Cookie
NSHTTPCookieStorage *storages = [NSHTTPCookieStorage sharedHTTPCookieStorage];
for (NSHTTPCookie *cookie in [storages cookies]) {
        NSLog(@"%@",cookie);
    }
      
//设置Cookie 
- (void)setCookieWithDomain:(NSString*)domainValue
                sessionName:(NSString *)name
               sessionValue:(NSString *)value
                expiresDate:(NSDate *)date{
      
    NSURL *url = [NSURL URLWithString:domainValue];
    NSString *domain = [url host];
      
    //创建字典存储cookie的属性值
    NSMutableDictionary *cookieProperties = [NSMutableDictionary dictionary];
    //设置cookie名
    [cookieProperties setObject:name forKey:NSHTTPCookieName];
    //设置cookie值
    [cookieProperties setObject:value forKey:NSHTTPCookieValue];
    //设置cookie域名
    [cookieProperties setObject:domain forKey:NSHTTPCookieDomain];
    //设置cookie路径 一般写"/"
    [cookieProperties setObject:@"/" forKey:NSHTTPCookiePath];
    //设置cookie版本, 默认写0
    [cookieProperties setObject:@"0" forKey:NSHTTPCookieVersion];
    //设置cookie过期时间
    if (date) {
        [cookieProperties setObject:date forKey:NSHTTPCookieExpires];
    }else{
        [cookieProperties setObject:[NSDate dateWithTimeIntervalSince1970:([[NSDate date] timeIntervalSince1970]+365*24*3600)] forKey:NSHTTPCookieExpires];
    }
    [[NSUserDefaults standardUserDefaults] setObject:cookieProperties forKey:@"app_cookies"];
    //删除原cookie, 如果存在的话
    NSArray * arrayCookies = [[NSHTTPCookieStorage sharedHTTPCookieStorage] cookies];
    for (NSHTTPCookie * cookice in arrayCookies) {
        [[NSHTTPCookieStorage sharedHTTPCookieStorage] deleteCookie:cookice];
  
    }
    //使用字典初始化新的cookie
    NSHTTPCookie *newcookie = [NSHTTPCookie cookieWithProperties:cookieProperties];
    //使用cookie管理器 存储cookie
    [[NSHTTPCookieStorage sharedHTTPCookieStorage] setCookie:newcookie];
}

WK的cookie 退出重新进，cookie不存在

UI存的NSHTTPCookieStorage,可以在沙盒找到文件

WK存的WKHTTPCookieStorage，走的是Webkit内核

网络请求的派发
- 请求的派发与取消
- 多服务器的切换
- 对象处理接口
- 请求结果的格式化
- 缓存处理
KCURLRequestGenerator
KCService
KCNetworkClient
KCAPIManager

KCCache

  #import "KCURLProtocol.h"
  #import <objc/runtime.h>
  #import <UIKit/UIKit.h>
  #import <WebKit/WebKit.h>
    
    
  static NSString *const kcProtocolKey = @"kcProtocolKey";
    
  @implementation KCURLProtocol
    
  // 这个方法是注册后,NSURLProtocol就会通过这个方法确定参数request是否需要被处理
  // return : YES 需要经过这个NSURLProtocol"协议" 的处理, NO 这个 协议request不需要遵守这个NSURLProtocol"协议"
  // 这个方法的作用 :
  //   -| 1, 筛选Request是否需要遵守这个NSURLRequest ,
  //   -| 2, 处理http: , https等URL
    
  + (BOOL)canInitWithRequest:(NSURLRequest *)request{
      
      if ([NSURLProtocol propertyForKey:kcProtocolKey inRequest:request]) {
          return NO;
      }
      NSString *scheme         = [[request URL] scheme];
      NSString *absoluteString = [[request URL] absoluteString];
      NSLog(@"absoluteString--%@",absoluteString);
        
      //注入 --  拦截图片，到startLoading
      NSString* extension = request.URL.pathExtension;
      NSArray *array = @[@"png", @"jpeg", @"gif", @"jpg"];
      if([array containsObject:extension]){
          return YES;
      }
        
      if ([absoluteString isEqualToString:@"https://m.baidu.com/static/index/plus/plus_logo.png"] || [absoluteString isEqualToString:@"http://www.baidu.com"]) {
          return YES;
      }
      return NO;
    }
    
  //这个方法就是返回规范的request
  + (NSURLRequest *)canonicalRequestForRequest:(NSURLRequest *)request{
      return request;
      }
    
  // 需要在该方法中发起一个请求，对于NSURLConnection来说，就是创建一个NSURLConnection，对于NSURLSession，就是发起一个NSURLSessionTask
  // 另外一点就是这个方法之后,会回调协议中的方法,
    
  - (void)startLoading{
      
      NSLog(@"来了");
      NSMutableURLRequest *request = [self.request mutableCopy];
      NSString *absoluteString = [[request URL] absoluteString];
      [NSURLProtocol setProperty:@(YES) forKey:kcProtocolKey inRequest:request];
    
      NSData *data = [self getImageData];
      [self.client URLProtocol:self didLoadData:data];
    
      //重定向
    //    request.URL = [NSURL URLWithString:@"http://127.0.0.1:8080/pythonJson/"];
    //
    //    [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {
    //
    //        NSLog(@"startLoading == %@---%@",response,data);
    //
    //        [self.client URLProtocol:self didLoadData:data];
    //        [self.client URLProtocol:self didReceiveResponse:response cacheStoragePolicy:NSURLCacheStorageAllowed];
    //    }];
    
  }
    
  // 这个方法是和start是对应的 一般在这个方法中,断开Connection
  // 另外一点就是当NSURLProtocolClient的协议方法都回调完毕后,就会开始执行这个方法了
  - (void)stopLoading{
      
    
  }
    
  // 这个方法主要用来判断两个请求是否是同一个请求，
  // 如果是，则可以使用缓存数据，通常只需要调用父类的实现即可,默认为YES,而且一般不在这里做事情
  + (BOOL)requestIsCacheEquivalent:(NSURLRequest *)a toRequest:(NSURLRequest *)b {
      return [super requestIsCacheEquivalent:a toRequest:b];
      }
    
    
  #pragma mark - private
    
  - (NSData *)getImageData{
    
      NSString *fileName = [[NSBundle mainBundle] pathForResource:@"lufei.jpg" ofType:@""];
      return [NSData dataWithContentsOfFile:fileName];
    
  }
    
  #pragma mark - hook
    
  //重定向
  + (void)hookNSURLSessionConfiguration{
      
      Class cls = NSClassFromString(@"__NSCFURLSessionConfiguration") ?: NSClassFromString(@"NSURLSessionConfiguration");
        
      Method originalMethod = class_getInstanceMethod(cls, @selector(protocolClasses));
      Method stubMethod = class_getInstanceMethod([self class], @selector(protocolClasses));
      if (!originalMethod || !stubMethod) {
          [NSException raise:NSInternalInconsistencyException format:@"没有这个方法 无法交换"];
      }
      method_exchangeImplementations(originalMethod, stubMethod);
    }
    
  - (NSArray *)protocolClasses {
      return @[[KCURLProtocol class]];
      //如果还有其他的监控protocol,也可以在这里加进去
      }
    
  @end