<!-- 阿里云OSS對象存儲 -->
<dependency>
	<groupId>com.aliyun.oss</groupId>
	<artifactId>aliyun-sdk-oss</artifactId>
	<version>3.8.0</version>
</dependency>

# 節(jié)點域名
aliyun.oss.endpoint=oss-cn-xxxxxxx.aliyuncs.com
# 賬戶id
aliyun.oss.accessKeyId=xxxxxxxxxxxxx
# 賬戶密碼
aliyun.oss.accessKeySecret=xxxxxxxxxxxxx
# bucket名稱
aliyun.oss.bucketName=xxxxxxxxxxx
# 簽名過期時間
aliyun.oss.policy.expire=300
# 上傳文件的最大尺寸
aliyun.oss.maxSize=10
# 上傳地址的前綴
aliyun.oss.dir.prefix=xxx
# 回調參數(shù)的請求地址
aliyun.oss.callback=http://www.xxxxxx.com/api/aliyun/oss/callback

@Configuration
@PropertySource(value = {"classpath:application.properties"}, encoding = "utf-8")
public class OssConfig {

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

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

 @Value("${aliyun.oss.accessKeySecret}")
 private String secretAccessKey;

 @Bean
 public OSS ossClient(){
 return new OSSClientBuilder().build(endpoint, accessKeyId, secretAccessKey);
 }
}

PolicyConditions policyConds = new PolicyConditions();
policyConds.addConditionItem(PolicyConditions.COND_CONTENT_LENGTH_RANGE, 0, maxSize);
policyConds.addConditionItem(MatchMode.StartWith, PolicyConditions.COND_KEY, DIR_PREFIX);
String postPolicy = ossClient.generatePostPolicy(expiration, policyConds);
byte[] binaryData = postPolicy.getBytes(StandardCharsets.UTF_8);
// 將Policy字符串進行base64編碼
String policy = BinaryUtil.toBase64String(binaryData);
// 用OSS的AccessKeySecret對base64編碼后的Policy進行簽名
String signature = ossClient.calculatePostSignature(postPolicy);

// 上傳回調參數(shù)
Callback callback = new Callback();
// 指定請求回調的服務器URL
callback.setCallbackUrl(CALLBACK);
//（可選）設置回調請求消息頭中Host的值，即您的服務器配置Host的值。
// callback.setCallbackHost("yourCallbackHost");
// 設置發(fā)起回調時請求body的值。
callback.setCallbackBody("{\\\"filename\\\":${object},\\\"mineType\\\":${mimeType}}");
// 設置發(fā)起回調請求的Content-Type。
callback.setCalbackBodyType(Callback.CalbackBodyType.JSON);
// 設置發(fā)起回調請求的自定義參數(shù)，由Key和Value組成，Key必須以x:開始。
// callback.addCallbackVar("x:dir", "value");

@Data
public class OssPolicyResult {

	@ApiModelProperty("用戶id")
	private String accessKeyId;
	
	@ApiModelProperty("Post Policy經過base64編碼過的字符串")
 private String policy;
	
	@ApiModelProperty("對policy簽名后的字符串")
 private String signature;

	// @ApiModelProperty("對象的鍵值")
	// private String key;
	
	@ApiModelProperty("上傳文件夾路徑前綴")
 private String dir;
	
	@ApiModelProperty("oss對外服務的訪問域名")
 private String host;

	@ApiModelProperty("上傳成功后的回調設置")
	private String callback;
}

@Data
public class OssCallBackResult {

 @ApiModelProperty("文件的鏈接")
 private String url;
 @ApiModelProperty("文件名稱")
 private String filename;
 @ApiModelProperty("文件大小")
 private String size;
 @ApiModelProperty("文件的mimeType")
 private String mimeType;
 @ApiModelProperty("圖片文件的寬")
 private String width;
 @ApiModelProperty("圖片文件的高")
 private String height;
}

public interface OssService {
	
 // 生成Post Policy
	OssPolicyResult policy();
	
 // 上傳成功后的回調
	OssCallBackResult callback(Map<String, Object> requestBody);
}

@Slf4j
@Service
@PropertySource(value = {"classpath:application.properties"}, encoding = "utf-8")
public class OssServiceImpl implements OssService {

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

	@Value("${aliyun.oss.accessKeyId}")
	private String ACCESS_KEY_ID;

	@Value("${aliyun.oss.accessKeySecret}")
	private String SECRET_ACCESS_KEY;

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

	@Value("${aliyun.oss.policy.expire}")
	private int EXPIRE;

	@Value("${aliyun.oss.maxSize}")
	private int MAX_SIZE;

	@Value("${aliyun.oss.dir.prefix}")
	private String DIR_PREFIX;

	@Value("${aliyun.oss.callback}")
	private String CALLBACK;

	@Autowired
	private OSS ossClient;

	@Override
	public OssPolicyResult policy() {
		OssPolicyResult result = new OssPolicyResult();
		// 簽名有效期
		long expireEndTime = System.currentTimeMillis() + EXPIRE * 1000;
		Date expiration = new Date(expireEndTime);
		// 文件名稱
		// String filename = UUID.randomUUID().toString();
		// 文件大小
		long maxSize = MAX_SIZE * 1024 * 1024;
		// 提交節(jié)點
		String action = "http://" + BUCKET_NAME + "." + ENDPOINT;
		// 上傳回調參數(shù)
		Callback callback = new Callback();
		// 指定請求回調的服務器URL
		callback.setCallbackUrl(CALLBACK);
		//（可選）設置回調請求消息頭中Host的值，即您的服務器配置Host的值。
		// callback.setCallbackHost("yourCallbackHost");
		// 設置發(fā)起回調時請求body的值。
		callback.setCallbackBody("{\\\"filename\\\":${object}}");
		// 設置發(fā)起回調請求的Content-Type。
		callback.setCalbackBodyType(Callback.CalbackBodyType.JSON);
		// 設置發(fā)起回調請求的自定義參數(shù)，由Key和Value組成，Key必須以x:開始。
		// callback.addCallbackVar("x:dir", "value");
		try {
			PolicyConditions policyConds = new PolicyConditions();
			policyConds.addConditionItem(PolicyConditions.COND_CONTENT_LENGTH_RANGE, 0, maxSize);
			policyConds.addConditionItem(MatchMode.StartWith, PolicyConditions.COND_KEY, DIR_PREFIX);
			String postPolicy = ossClient.generatePostPolicy(expiration, policyConds);
			byte[] binaryData = postPolicy.getBytes(StandardCharsets.UTF_8);
 // 將Policy字符串進行base64編碼
			String policy = BinaryUtil.toBase64String(binaryData);
 // 用OSS的AccessKeySecret對base64編碼后的Policy進行簽名
			String signature = ossClient.calculatePostSignature(postPolicy);
 // 將callback配置進行base64編碼
			String callbackData = BinaryUtil.toBase64String(OSSUtils.jsonizeCallback(callback).getBytes());
			// 返回結果
			result.setAccessKeyId(ACCESS_KEY_ID);
			result.setPolicy(policy);
			result.setSignature(signature);
			// result.setKey(filename);
			result.setDir(dir);
			result.setHost(action);
			result.setCallback(callbackData);
		} catch (Exception e) {
			log.error("簽名生成失敗", e);
		}
		return result;
	}

	@Override
	public OssCallBackResult callback(Map<String, Object> requestBody) {
		OssCallBackResult ossCallbackResult = new OssCallBackResult();
		// 文件名
		String filename = requestBody.get("filename").toString();
		// 文件鏈接
		String url = "https://" + BUCKET_NAME + "." + ENDPOINT + "/" + DIR_PREFIX + "/" + filename;
		ossCallbackResult.setUrl(url);
		return ossCallbackResult;
	}
}

@Api(tags = "阿里云對象存儲接口")
@RequestMapping("/api")
@RestController
public class OssController {
	
	@Autowired
	private OssService ossService;
	
	@ApiOperation(value = "OSS上傳簽名生成")
	@GetMapping("/aliyun/oss/policy")
	public Object policy() {
		return ossService.policy();
	}

	@ApiOperation(value = "OSS上傳成功回調")
	@PostMapping("/aliyun/oss/callback")
	public Object callback(@RequestBody Map<String, Object> requestBody) {
		return ossService.callback(requestBody);
	}
}