APP通过后台获取OSS参数进行上传

APP上传图片需要开通临时授权（这里用的STS服务授权）

这时候需要开通OSS的RAM账户（访问控制）

开通链接如下：

https://www.cnblogs.com/kenshinobiy/p/7743386.html

package com.unionx.wsapi.controller;

import com.aliyuncs.DefaultAcsClient;
import com.aliyuncs.exceptions.ClientException;
import com.aliyuncs.http.MethodType;
import com.aliyuncs.http.ProtocolType;
import com.aliyuncs.profile.DefaultProfile;
import com.aliyuncs.profile.IClientProfile;
import com.aliyuncs.sts.model.v20150401.AssumeRoleRequest;
import com.aliyuncs.sts.model.v20150401.AssumeRoleResponse;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

import java.util.HashMap;
import java.util.Map;

/**
 * 
 * ClassName: AliOSSAppToken.java 

 * Description: 

 * Create by: name：luyong 
email: [email protected]
 * Create Time: 2019年1月18日

 */
@Component
public class AliOSSAppToken {
	
    public static final String REGION_CN_BEIJING = "cn-beijing";
    public static final String STS_API_VERSION = "2015-04-01";

    @Value("${oss.host.endpoint}")
    private String endpoint;

    @Value("${aliyunoss.accessKeyId}")
    private String accessKeyId;

    @Value("${aliyunoss.accessKeySecret}")
    private String accessKeySecret;

    @Value("${oss.bucket}")
    private String bucketName;

    @Value("${aliyunoss.roleArn}")
    private String roleArn;

    protected AssumeRoleResponse assumeRole(String accessKeyId, String accessKeySecret, String roleArn,
                                            String roleSessionName, String policy, ProtocolType protocolType,
                                            long durationSeconds) throws ClientException {
        try {
            // 创建一个 Aliyun Acs Client, 用于发起 OpenAPI 请求
            IClientProfile profile = DefaultProfile.getProfile(REGION_CN_BEIJING, accessKeyId, accessKeySecret);
            DefaultAcsClient client = new DefaultAcsClient(profile);

            // 创建一个 AssumeRoleRequest 并设置请求参数
            final AssumeRoleRequest request = new AssumeRoleRequest();
            request.setVersion(STS_API_VERSION);
            request.setMethod(MethodType.POST);
            request.setProtocol(protocolType);

            request.setRoleArn(roleArn);
            request.setRoleSessionName(roleSessionName);
            request.setPolicy(policy);
            request.setDurationSeconds(durationSeconds);

            // 发起请求，并得到response
            final AssumeRoleResponse response = client.getAcsResponse(request);
            return response;
        } catch (ClientException e) {
            throw e;
        }
    }

    public Map getOss() throws Exception {
        // 只有 RAM用户（子账号）才能调用 AssumeRole 接口
        // 阿里云主账号的AccessKeys不能用于发起AssumeRole请求
        // 请首先在RAM控制台创建一个RAM用户，并为这个用户创建AccessKeys
        //String accessKeyId = "";
        //String accessKeySecret = "";
        // RoleArn 需要在 RAM 控制台上获取
        //String roleArn = "";
        long durationSeconds = 3600l;

        /*
        关于PolicyFile本来是根据业务场景配置的，此处先写死
        String policy = ReadJson(jsonObj.getString("PolicyFile"));
        */
        String policy = "{\"Statement\":[{\"Action\":[\"oss:*\"],\"Effect\":\"Allow\",\"Resource\":[\"acs:oss:*:*:*\"]}],\"Version\":\"1\"}";
        // RoleSessionName 是临时Token的会话名称，自己指定用于标识你的用户，主要用于审计，或者用于区分Token颁发给谁
        // 但是注意RoleSessionName的长度和规则，不要有空格，只能有'-' '_' 字母和数字等字符
        // 具体规则请参考API文档中的格式要求
        String roleSessionName = "alice";
        // 此处必须为 HTTPS
        ProtocolType protocolType = ProtocolType.HTTPS;
        final AssumeRoleResponse stsResponse = assumeRole(accessKeyId, accessKeySecret, roleArn, roleSessionName,
                    policy, protocolType, durationSeconds);
        Map map = new HashMap();
        map.put("AccessKeyId", stsResponse.getCredentials().getAccessKeyId());
        map.put("AccessKeySecret", stsResponse.getCredentials().getAccessKeySecret());
        map.put("SecurityToken", stsResponse.getCredentials().getSecurityToken());
        map.put("Expiration", stsResponse.getCredentials().getExpiration());
        map.put("Endpoint", endpoint);
        map.put("bucketName", bucketName);
        return map;
    }

}