!16 修复 OSS 保存路径问题，以及特殊环境下 OSS 下载到本地会出现 UnknownHost 错误。

Merge pull request !16 from 青木/dev

jeepay-components/jeepay-components-oss/src/main/java/com/jeequan/jeepay/components/oss/service/AliyunOssService.java

@@ -19,6 +19,7 @@ import com.aliyun.oss.OSS;
 import com.aliyun.oss.OSSClientBuilder;
 import com.aliyun.oss.model.GetObjectRequest;
 import com.jeequan.jeepay.components.oss.config.AliyunOssYmlConfig;
+import com.jeequan.jeepay.components.oss.config.OssYmlConfig;
 import com.jeequan.jeepay.components.oss.constant.OssSavePlaceEnum;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.beans.factory.annotation.Autowired;
@@ -30,44 +31,83 @@ import javax.annotation.PostConstruct;
 import java.io.File;
 
 /**
-* 阿里云OSS 实现类
-*
-* @author terrfly
-* @site https://www.jeequan.com
-* @date 2021/7/12 18:20
-*/
+ * 阿里云OSS 实现类
+ *
+ * @author terrfly
+ * @site https://www.jeequan.com
+ * @date 2021/7/12 18:20
+ */
 @Service
 @Slf4j
 @ConditionalOnProperty(name = "isys.oss.service-type", havingValue = "aliyun-oss")
-public class AliyunOssService implements IOssService{
+public class AliyunOssService implements IOssService {
+
+    @Autowired
+    private AliyunOssYmlConfig aliyunOssYmlConfig;
 
-    @Autowired private AliyunOssYmlConfig aliyunOssYmlConfig;
+    @Autowired
+    private OssYmlConfig ossYmlConfig;
 
     // ossClient 初始化
     private OSS ossClient = null;
 
     @PostConstruct
-    public void init(){
-        ossClient = new OSSClientBuilder().build(aliyunOssYmlConfig.getEndpoint(), aliyunOssYmlConfig.getAccessKeyId(), aliyunOssYmlConfig.getAccessKeySecret());
+    public void init() {
+        ossClient = new OSSClientBuilder().build(aliyunOssYmlConfig.getEndpoint(), aliyunOssYmlConfig.getAccessKeyId(),
+                aliyunOssYmlConfig.getAccessKeySecret());
+    }
+
+    /**
+     * 处理文件保存路径
+     *
+     * @param ossSavePlaceEnum 保存位置
+     * @param filePath         文件路径
+     * @return 完整路径
+     */
+    private String getFileKey(OssSavePlaceEnum ossSavePlaceEnum, String filePath) {
+        // 上传的时候需要考虑 OSS 存储空间的访问权限，并拼接路径前缀
+        String filePrefix = ossSavePlaceEnum == OssSavePlaceEnum.PUBLIC ? ossYmlConfig.getOss()
+                .getFilePublicPath() : ossYmlConfig.getOss().getFilePrivatePath();
+
+        // 如果路径包含设置的路径前缀，则跳过
+        if (filePath.startsWith(filePrefix)) {
+            // OSS 不允许路径第一个字符为 /
+            if (filePath.indexOf("/") == 0) {
+                filePath = filePath.replaceFirst("/", "");
+            }
+            return filePath;
+        }
+
+        String fullPath = (filePrefix + "/" + filePath);
+
+        // OSS 不允许路径第一个字符为 /
+        if (fullPath.indexOf("/") == 0) {
+            fullPath = fullPath.replaceFirst("/", "");
+        }
+
+        return fullPath;
     }
 
     @Override
-    public String upload2PreviewUrl(OssSavePlaceEnum ossSavePlaceEnum, MultipartFile multipartFile, String saveDirAndFileName) {
+    public String upload2PreviewUrl(OssSavePlaceEnum ossSavePlaceEnum, MultipartFile multipartFile,
+                                    String saveDirAndFileName) {
 
         try {
 
-            this.ossClient.putObject(ossSavePlaceEnum == OssSavePlaceEnum.PUBLIC ? aliyunOssYmlConfig.getPublicBucketName() : aliyunOssYmlConfig.getPrivateBucketName()
-                    , saveDirAndFileName, multipartFile.getInputStream());
+            String fullPath = getFileKey(ossSavePlaceEnum, saveDirAndFileName);
 
-            if(ossSavePlaceEnum == OssSavePlaceEnum.PUBLIC){
+            this.ossClient.putObject(
+                    ossSavePlaceEnum == OssSavePlaceEnum.PUBLIC ? aliyunOssYmlConfig.getPublicBucketName() : aliyunOssYmlConfig.getPrivateBucketName()
+                    , fullPath, multipartFile.getInputStream());
+
+            if (ossSavePlaceEnum == OssSavePlaceEnum.PUBLIC) {
                 // 文档：https://www.alibabacloud.com/help/zh/doc-detail/39607.htm  example: https://BucketName.Endpoint/ObjectName
-                return "https://" + aliyunOssYmlConfig.getPublicBucketName() + "." + aliyunOssYmlConfig.getEndpoint() + "/" + saveDirAndFileName;
+                return "https://" + aliyunOssYmlConfig.getPublicBucketName() + "." + aliyunOssYmlConfig.getEndpoint() + "/" + fullPath;
             }
-
             return saveDirAndFileName;
 
         } catch (Exception e) {
-           log.error("error", e);
+            log.error("error", e);
             return null;
         }
     }
@@ -76,9 +116,21 @@ public class AliyunOssService implements IOssService{
     public boolean downloadFile(OssSavePlaceEnum ossSavePlaceEnum, String source, String target) {
 
         try {
+            String fullPath = getFileKey(ossSavePlaceEnum, source);
+
+            File downloadFile = new File(target);
+
+            // 当本地路径的上层目录不存在时，自动创建
+            // OSS SDK 在 Docker 内部可能出现 UnknownHost 错误具体表现为
+            // com.aliyun.oss.ClientException: Cannot read the content input stream.
+            if (!downloadFile.getParentFile().exists()) {
+                log.info("downloadFile parent dir not exists create it: {}",
+                        downloadFile.getParentFile().getAbsolutePath());
+                downloadFile.getParentFile().mkdirs();
+            }
 
             String bucket = ossSavePlaceEnum == OssSavePlaceEnum.PRIVATE ? aliyunOssYmlConfig.getPrivateBucketName() : aliyunOssYmlConfig.getPublicBucketName();
-            this.ossClient.getObject(new GetObjectRequest(bucket, source), new File(target));
+            this.ossClient.getObject(new GetObjectRequest(bucket, fullPath), downloadFile);
 
             return true;
         } catch (Exception e) {