Obtain Object Metadata

API Description

You can use this API to send a HEAD request to the object of a specified bucket to obtain its metadata.

Method Definition

ObsClient.getObjectMetadata

Request Parameter

Field	Type	Optional or Mandatory	Description
Bucket	String	Mandatory	Bucket name
Key	String	Mandatory	Object name
VersionId	String	Optional	Object version ID
Origin	String	Optional	Origin of the cross-domain request specified by the pre-request. Generally, it is a domain name.
RequestHeader	String	Optional	HTTP headers in the cross-domain request
SseC	String	Optional	Algorithm used in SSE-C decryption. The value can be: AES256
SseCKey	Buffer	Optional	Key used in SSE-C decryption, which is calculated by using AES256.

Returned Result (InterfaceResult)

Field	Type	Description
RequestId	String	Request ID returned by the OBS server
LastModified	String	Time when the last modification was made to the object
ContentLength	String	Object size in bytes
ContentType	String	MIME type of the object
ETag	String	Object ETag
VersionId	String	Object version ID
WebsiteRedirectLocation	String	Location where the object is redirected to, when the bucket is configured with website hosting
StorageClass	String	Storage class of the object. When the storage class is OBS Standard, the value is null.
Restore	String	Restore status of the object in the OBS Archive storage class
AllowOrigin	String	If Origin in the request meets the CORS rules of the bucket, AllowedOrigin in the CORS rules is returned.
AllowHeader	String	If AccessControlRequestHeaders in the request meets the CORS rules of the bucket, AllowedHeader in the CORS rules is returned.
AllowMethod	String	AllowedMethod in the CORS rules of the bucket
ExposeHeader	String	ExposeHeader in the CORS rules of the bucket
MaxAgeSeconds	String	MaxAgeSeconds in the CORS rules of the bucket
SseKms	String	Algorithm used in SSE-KMS decryption
SseKmsKey	String	Master key used in SSE-KMS decryption
SseC	String	Algorithm used in SSE-C decryption
SseCKeyMd5	String	MD5 value of the key used in SSE-C decryption
Expiration	String	Expiration details
Metadata	Object	Customized metadata of the object
ObjectType	String	Whether the object is an appendable object
NextPosition	String	Start position for next appending

Sample Code

obsClient.getObjectMetadata({
       Bucket:'bucketname',
       Key : 'objectkey'
},(err, result) => {
       if(err){
              console.error('Error-->' + err);
       }else{
              if(result.CommonMsg.Status < 300){
                     console.log('RequestId-->' + result.InterfaceResult.RequestId);
                     console.log('ETag-->' + result.InterfaceResult.ETag);
                     console.log('VersionId-->' + result.InterfaceResult.VersionId);
                     console.log('ContentLength-->' + result.InterfaceResult.ContentLength);
                     console.log('Expiration-->' + result.InterfaceResult.Expiration);
                     console.log('Metadata-->' + JSON.stringify(result.InterfaceResult.Metadata));
                     console.log('LastModified-->' + result.InterfaceResult.LastModified);
                     console.log('StorageClass-->' + result.InterfaceResult.StorageClass);
              }else{
                     console.log('Status-->' + result.CommonMsg.Status);
              }
       }
});