Angular15中@aws-sdk/client-s3的CopyObjectCommand无法复制文件

在Angular 15项目中使用@aws-sdk/client-s3@3.312.0，PutObjectCommand可以正常存储文件，但调用CopyObjectCommand返回成功响应后，目标存储桶中并未出现复制后的文件。实际需求是重命名文件，因此会在复制后调用DeleteObjectCommand。

传入的复制参数如下：

Bucket: "simplify-pilot-media-dev"
CopySource: "/simplify-pilot-media-dev/profiles/0972000547780992.jpg"
Key: "profiles/0972000547780999.jpg"

（已尝试去掉CopySource中存储桶名称前的前置斜杠）

调用后收到正常响应，但文件未完成复制。相关代码如下：

async copyFile(fileSource: string, fileTarget: string, deleteSource: boolean = false ): Promise<any> {
    const bucket = environment.awsBucket;
    const s3Client = new S3Client({ 
      region: environment.awsRegion,
      //credentials: fromIni({profile: 'dev'}) });
      credentials: {        
        accessKeyId: environment.awsAccessKeyS3,
        secretAccessKey: environment.awsSecretS3,
      }
    });

    const params = {
      Bucket: bucket,
      CopySource: '/' + bucket + '/' + fileSource,      
      Key: fileTarget,
    };
    console.log('About to call AWS S3 copy file with: ', params);
    try {
      const results = await s3Client.send(new CopyObjectCommand(params));
      console.log('Copied S3 file: ', results);
      if (!results) {
        return results;
      }
      if (deleteSource) {
        const paramsDelete = {
          Bucket: bucket,                
          Key: fileSource,
        };
        const resultsDelete = await s3Client.send(new DeleteObjectCommand(params));
        console.log('Deleted S3 file: ', resultsDelete);
        return resultsDelete;
      } else {
        return results;
      }      
    } catch (err) {
      console.log('There was an error renaming your file: ', err);
        return false;
    }
  }

核心问题及修复方案 #

1. DeleteObjectCommand参数错误
   代码中删除操作时错误传入了复制用的params，而非定义好的paramsDelete。这会导致刚复制的目标文件被删除，而非源文件，看起来像是复制未成功。
   修复：将删除操作的参数改为paramsDelete：

   const resultsDelete = await s3Client.send(new DeleteObjectCommand(paramsDelete));
   

2. CopySource格式问题
   AWS SDK v3中，CopySource的正确格式不需要前置斜杠，当源对象和目标对象在同一个桶时，格式应为${bucket}/${fileSource}。前置斜杠可能导致S3解析路径错误，虽然返回成功但实际未找到源对象。
   修复：修改CopySource的拼接方式：

   CopySource: `${bucket}/${fileSource}`,
   

修复后的完整代码 #

async copyFile(fileSource: string, fileTarget: string, deleteSource: boolean = false ): Promise<any> {
    const bucket = environment.awsBucket;
    const s3Client = new S3Client({ 
      region: environment.awsRegion,
      credentials: {        
        accessKeyId: environment.awsAccessKeyS3,
        secretAccessKey: environment.awsSecretS3,
      }
    });

    const params = {
      Bucket: bucket,
      CopySource: `${bucket}/${fileSource}`,      
      Key: fileTarget,
    };
    console.log('About to call AWS S3 copy file with: ', params);
    try {
      const results = await s3Client.send(new CopyObjectCommand(params));
      console.log('Copied S3 file: ', results);
      if (!results) {
        return results;
      }
      if (deleteSource) {
        const paramsDelete = {
          Bucket: bucket,                
          Key: fileSource,
        };
        const resultsDelete = await s3Client.send(new DeleteObjectCommand(paramsDelete));
        console.log('Deleted S3 file: ', resultsDelete);
        return resultsDelete;
      } else {
        return results;
      }      
    } catch (err) {
      console.log('There was an error renaming your file: ', err);
        return false;
    }
  }

内容的提问来源于stack exchange，提问作者Mor Sagmon