import android.content.Context;
import com.tencent.cos.xml.*;
import com.tencent.qcloud.core.auth.*;
import com.tencent.qcloud.core.common.*;
import com.tencent.qcloud.core.http.*;
import java.net.*;


Context context = ...;
CosXmlServiceConfig cosXmlServiceConfig = ...;

/**
 * 라이선스 서비스의 url 주소 획득
 */
URL url = null; // 백그라운드의 라이선스 서비스 url 주소
try {
    url = new URL("your_auth_server_url");
} catch (MalformedURLException e) {
    e.printStackTrace();
}

/**
 * {@link QCloudCredentialProvider} 객체 초기화로 SDK에 임시 키 부여
 */
QCloudCredentialProvider credentialProvider = new SessionCredentialProvider(new HttpRequest.Builder<String>()
                .url(url)
                .method("GET")
                .build());

CosXmlService cosXmlService = new CosXmlService(context, cosXmlServiceConfig, credentialProvider);                

import android.content.Context;
import com.tencent.cos.xml.*;
import com.tencent.qcloud.core.auth.*;
import com.tencent.qcloud.core.common.*;
import com.tencent.qcloud.core.http.*;
import java.net.*;


public class MyCredentialProvider extends BasicLifecycleCredentialProvider {

    @Override
    protected QCloudLifecycleCredentials fetchNewCredentials() throws QCloudClientException {

        // 먼저 임시 키 서버로부터 서명 정보가 담긴 응답 획득
        ....

        // 응답을 분석하여 키 정보 획득
        String tmpSecretId = ...;
        String tmpSecretKey = ...;
        String sessionToken = ...;
        long expiredTime = ...;

        // 서버 반환 시간을 서명 시작 시간으로 설정
        long beginTime = ...;

        // todo something you want

        // 최종적으로 임시 키 정보 객체 반환 
        return new SessionQCloudCredentials(tmpSecretId, tmpSecretKey, sessionToken, beginTime, expiredTime);
    }
}

import android.content.Context;
import com.tencent.cos.xml.*;
import com.tencent.qcloud.core.auth.*;
import com.tencent.qcloud.core.common.*;
import com.tencent.qcloud.core.http.*;
import java.net.*;

Context context = ...;
CosXmlServiceConfig cosXmlServiceConfig = ...;

/**
 * {@link QCloudCredentialProvider} 객체 초기화로 SDK에 임시 키 부여
 */
QCloudCredentialProvider credentialProvider = new MyCredentialProvider();

CosXmlService cosXmlService = new CosXmlService(context, cosXmlServiceConfig, credentialProvider);   

 //AppDelegate.m
//AppDelegate는 QCloudCredentailFenceQueueDelegate 프로토콜 따름
//
- (BOOL)application:(UIApplication * )application didFinishLaunchingWithOptions:(NSDictionary * )launchOptions {
    // init step
    self.credentialFenceQueue = [QCloudCredentailFenceQueue new];
    self.credentialFenceQueue.delegate = self;
    return YES;
}


- (void) fenceQueue:(QCloudCredentailFenceQueue * )queue requestCreatorWithContinue:(QCloudCredentailFenceQueueContinue)continueBlock

- (void)fenceQueue:(QCloudCredentailFenceQueue *)queue requestCreatorWithContinue:(QCloudCredentailFenceQueueContinue)continueBlock {
    QCloudHTTPRequest* request = [QCloudHTTPRequest new];
    request.requestData.serverURL = @“your sign service url”;//요청한 URL

    [request setConfigureBlock:^(QCloudRequestSerializer *requestSerializer, QCloudResponseSerializer *responseSerializer) {
        requestSerializer.serializerBlocks = @[QCloudURLFuseWithURLEncodeParamters];
        responseSerializer.serializerBlocks = @[QCloudAcceptRespnseCodeBlock([NSSet setWithObjects:@(200), nil],nil),//반환 코드가 200이 아닌 경우, 오류 반환
                                                QCloudResponseJSONSerilizerBlock];//JSON 형식에 따라 반환 데이터 분석
    }];

    [request setFinishBlock:^(id response, NSError *error) {
        if (error) {
            error = [NSError errorWithDomain:@"com.tac.test" code:-1111 userInfo:@{NSLocalizedDescriptionKey:@"임시 키 미획득"}];
            continueBlock(nil, error);
        } else {
            QCloudCredential* crendential = [[QCloudCredential alloc] init];
            crendential.secretID = response[@"data"][@"credentials"][@"tmpSecretId"];
            crendential.secretKey = response[@"data"][@"credentials"][@"tmpSecretKey"];
            credential.startDate =[NSDate dateWithTimeIntervalSince1970:@"반환된 서버 시간"]
            crendential.experationDate = [NSDate dateWithTimeIntervalSinceNow:[response[@"data"][@"expiredTime"] intValue]];
            crendential.token = response[@"data"][@"credentials"][@"sessionToken"];;
            QCloudAuthentationV5Creator* creator = [[QCloudAuthentationV5Creator alloc] initWithCredential:crendential];
            continueBlock(creator, nil);

        }
    }];
    [[QCloudHTTPSessionManager shareClient] performRequest:request];
}

pod install