在Flutter中进行网络请求时,我们可以使用的库有3个,即Http请求库、HttpClient请求库和Dio请求库(详细介绍请参考:Flutter开发之Http网络请求),使用得最多的就是Dio请求库。因为相比Http请求库和HttpClient请求库,Dio库不仅支持常见的网络请求,还支持Restful API、FormData、拦截器、请求取消、Cookie管理、文件上传/下载、超时等操作。
不过,默认情况下,Dio进行网络请求时是不支持抓包的,所以如果要进行抓包,就需要对Dio进行请求封装,并编写代理代码。下面是代理的几种写法:
方法一
我们可以直接在Dio里面设置ip以及端口,通过硬编码的方式进行代理,代码如下:
(_dio.httpClientAdapter as DefaultHttpClientAdapter).onHttpClientCreate =
(client) {
//这一段是解决安卓https抓包的问题
client.badCertificateCallback =
(X509Certificate cert, String host, int port) {
return Platform.isAndroid;
};
client.findProxy = (uri) {
return "PROXY 代理ip:代理port";
};
};
不过,这种硬编码方式,写得太死,不够灵活,每次更改代理都需要打包。
方法二
直接在原生插件获取手代理ip和代理端口,不过Android比较难,下面是iOS的实现。
//自动获取手机代理
NSDictionary *proxySettings = (__bridge NSDictionary *)(CFNetworkCopySystemProxySettings());
NSArray *proxies = (__bridge NSArray *)(CFNetworkCopyProxiesForURL((__bridge CFURLRef _Nonnull)([NSURL URLWithString:call.arguments]), (__bridge CFDictionaryRef _Nonnull)(proxySettings)));
NSString *hostName = proxySettings[@"HTTPSProxy"];
NSString *portName = [NSString stringWithFormat:@"%@",proxySettings[@"HTTPPort"]];
long HTTPEnable = [proxySettings[@"HTTPEnable"] longValue];
if (HTTPEnable==0) {
hostName = @"";
}
方法三
除了上面的硬编码方式外,我们还可以采用scheme协议的方式传入代理ip和代理端口。此方法的步骤如下:
1,注册自己的URL Scheme,例如:scheme://
2,定义参数规则,例如:scheme://tiaoshi?host=10.0.206.163
3,引入flutter插件:uni_links: ^0.2.0
4,flutter监听解析参数,并在dio里面设置代理
5,使用[草料]https://cli.im生成一个二维码:内容:scheme://tiaoshi?host=10.0.206.163
6,使用原生相机扫码进入app就可以抓包
下面是涉及的代码,Flutter代码如下:
Future<Null> initUniLinks() async {
// 监听插件scheme数据
getLinksStream().listen((String link) {
link = Uri.decodeComponent(link);
if(link.contains("scheme://")){
String type = getTypeStr(link);
String param = link.replaceAll("scheme://$type?", "");
Map dict = getUrlParams(param);
if(type=="tiaoshi"){//设置抓包代理
String host = dict["host"];
String port = dict["port"];
//这里是网络请求封装
Net.setHttpProxy(host,port==null?"8888":port);
}
}
// Parse the link and warn the user, if it is not correct
}, onError: (err) {
// Handle exception by warning the user their action did not succeed
});
}
//获取scheme 要处理的业务类型
String getTypeStr(String link){
List params = link.split("?");
String typeStr = params[0];
typeStr = typeStr.replaceAll("scheme://", "");
return typeStr;
}
//url参数转map
Map getUrlParams(String paramStr) {
Map map = Map();
List params = paramStr.split("&");
for(int i=0;i<params.length;i++){
String str = params[i];
List arr = str.split("=");
map[arr[0]]= arr[1];
}
return map;
}
代理层代码:
static void setHttpProxy(String host,String port) {
Application.httpProxy = host+':'+port;
_initDio();
}
static Future<void> _initDio() async {
DeviceInfoPlugin deviceInfo = DeviceInfoPlugin();
if (Platform.isAndroid) {
_androidInfo = await deviceInfo.androidInfo;
} else if (Platform.isIOS) {
_iosInfo = await deviceInfo.iosInfo;
}
_dio = Dio(BaseOptions(
contentType: 'application/json',
baseUrl: Config.BASE_URL,
));
_dio.options.receiveTimeout = 5000;
_dio.options.connectTimeout = 10000;
if (Application.httpProxy.length != 0) {
(_dio.httpClientAdapter as DefaultHttpClientAdapter).onHttpClientCreate =
(client) {
//这一段是解决安卓https抓包的问题
client.badCertificateCallback =
(X509Certificate cert, String host, int port) {
return Platform.isAndroid;
};
//这是抓包代理
client.findProxy = (uri) {
return "PROXY ${Application.httpProxy}";
};
};
}
_dio.interceptors.addAll([
InterceptorsWrapper(
onRequest: (Options options) {
options.headers['DeviceName'] = 'xxxx';
return options;
},
onResponse: (Response res) {
try {
...
return res;
} catch (e) {
return res;
}
},
onError: (DioError e) {
print(e);
}
break;
default:
}
return e;
},
),
]);
}
static Future<ResponseModel> get(
String path, {
Map<String, dynamic> queryParameters,
Options options,
CancelToken cancelToken,
void Function(int, int) onReceiveProgress,
}) async {
if (_dio == null) {
await _initDio();
}
final res = await _dio.get<ResponseModel>(
path,
queryParameters: queryParameters,
options: options,
cancelToken: cancelToken,
onReceiveProgress: onReceiveProgress,
);
return res.data;
}
static Future<ResponseModel> post(
String path, {
dynamic data,
Map<String, dynamic> queryParameters,
Options options,
CancelToken cancelToken,
void Function(int, int) onSendProgress,
void Function(int, int) onReceiveProgress,
}) async {
if (_dio == null) {
await _initDio();
}
final res = await _dio.post<ResponseModel>(
path,
data: data,
queryParameters: queryParameters,
options: options,
cancelToken: cancelToken,
onSendProgress: onSendProgress,
onReceiveProgress: onReceiveProgress,
);
return res.data;
}
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