OCI Java SDK：使用请求签名器进行自定义REST API认证

import com.oracle.bmc.auth.AuthenticationDetailsProvider;
import com.oracle.bmc.auth.ConfigFileAuthenticationDetailsProvider;
import com.oracle.bmc.auth.InstancePrincipalsAuthenticationDetailsProvider;

// 方式一：使用配置文件认证
AuthenticationDetailsProvider provider = new ConfigFileAuthenticationDetailsProvider("DEFAULT");

// 方式二：使用实例主体认证 (适用于在OCI计算实例上运行的应用)
// AuthenticationDetailsProvider provider = InstancePrincipalsAuthenticationDetailsProvider.builder().build();

import com.oracle.bmc.http.signing.RequestSigner;
import com.oracle.bmc.http.signing.internal.DefaultRequestSigner;

RequestSigner requestSigner = DefaultRequestSigner.builder().build(provider);

import java.net.URI;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.net.http.HttpClient;
import java.time.Duration;

// 假设你要调用OCI对象存储的某个API，例如列出某个桶的对象
// 请替换为实际的OCI服务URI
String targetUrl = "https://objectstorage.us-ashburn-1.oraclecloud.com/n/your_namespace/b/your_bucket/o"; 

HttpRequest.Builder requestBuilder = HttpRequest.newBuilder()
        .uri(URI.create(targetUrl))
        .GET() // 或者 .POST(), .PUT() 等，根据你的API调用类型
        .header("Content-Type", "application/json"); // 根据API要求设置其他头部

// 应用签名
requestSigner.signRequest(requestBuilder);

// 构建最终的HttpRequest
HttpRequest request = requestBuilder.build();

HttpClient httpClient = HttpClient.newBuilder()
        .version(HttpClient.Version.HTTP_1_1)
        .connectTimeout(Duration.ofSeconds(10))
        .build();

try {
    HttpResponse<String> response = httpClient.send(request, HttpResponse.BodyHandlers.ofString());

    System.out.println("Status Code: " + response.statusCode());
    System.out.println("Response Body: " + response.body());

    if (response.statusCode() >= 200 && response.statusCode() < 300) {
        System.out.println("请求成功！");
    } else {
        System.err.println("请求失败！");
    }

} catch (Exception e) {
    System.err.println("发送请求时发生错误: " + e.getMessage());
    e.printStackTrace();
}

import com.oracle.bmc.auth.AuthenticationDetailsProvider;
import com.oracle.bmc.auth.ConfigFileAuthenticationDetailsProvider;
import com.oracle.bmc.http.signing.RequestSigner;
import com.oracle.bmc.http.signing.internal.DefaultRequestSigner;

import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.time.Duration;

public class OciCustomApiCaller {

    public static void main(String[] args) {
        // 1. 配置认证提供者
        AuthenticationDetailsProvider provider;
        try {
            // 假设OCI配置文件在 ~/.oci/config 且使用了 DEFAULT 配置项
            provider = new ConfigFileAuthenticationDetailsProvider("DEFAULT");
            System.out.println("使用配置文件进行认证。");
        } catch (Exception e) {
            System.err.println("无法加载OCI配置文件，尝试使用实例主体认证...");
            // 如果配置文件失败，可以尝试实例主体认证（仅在OCI计算实例上有效）
            // provider = InstancePrincipalsAuthenticationDetailsProvider.builder().build();
            System.err.println("实例主体认证未在此示例中实现，请根据您的环境选择合适的认证方式。");
            return;
        }

        // 2. 初始化RequestSigner
        RequestSigner requestSigner = DefaultRequestSigner.builder().build(provider);

        // 3. 构建HTTP请求
        // 示例：获取对象存储桶中的对象列表
        // 请替换为您的OCI命名空间、区域和桶名
        String namespace = "your_oci_namespace"; // 例如：axxxxxxb
        String bucketName = "your_bucket_name"; // 例如：my-test-bucket
        String region = "us-ashburn-1"; // 例如：us-ashburn-1

        String targetUrl = String.format("https://objectstorage.%s.oraclecloud.com/n/%s/b/%s/o",
                                         region, namespace, bucketName);

        HttpRequest.Builder requestBuilder = HttpRequest.newBuilder()
                .uri(URI.create(targetUrl))
                .GET()
                .header("Content-Type", "application/json"); // 对象存储API通常不需要Content-Type for GET

        // 4. 应用请求签名
        requestSigner.signRequest(requestBuilder);

        // 构建最终的HttpRequest
        HttpRequest request = requestBuilder.build();

        // 5. 发送请求
        HttpClient httpClient = HttpClient.newBuilder()
                .version(HttpClient.Version.HTTP_1_1)
                .connectTimeout(Duration.ofSeconds(10))
                .build();

        try {
            System.out.println("正在发送请求到: " + targetUrl);
            HttpResponse<String> response = httpClient.send(request, HttpResponse.BodyHandlers.ofString());

            System.out.println("\n--- 响应信息 ---");
            System.out.println("状态码: " + response.statusCode());
            System.out.println("响应头部: " + response.headers());
            System.out.println("响应体: " + response.body());

            if (response.statusCode() >= 200 && response.statusCode() < 300) {
                System.out.println("\n请求成功！");
            } else {
                System.err.println("\n请求失败！");
            }

        } catch (Exception e) {
            System.err.println("\n发送请求时发生错误: " + e.getMessage());
            e.printStackTrace();
        }
    }
}