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Glossary

Modifying Object Metadata

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Terakhir diperbarui: 2024-02-04 16:24:43

Overview

This document provides SDK code samples for modifying object metadata.

Modifying object metadata

If the source and destination objects are the same and CopyStatus is set to Replaced, you can modify the object metadata via the header.

Sample request

# -*- coding=utf-8
from qcloud_cos import CosConfig
from qcloud_cos import CosS3Client
import sys
import os
import logging

# In most cases, set the log level to INFO. If you need to debug, you can set it to DEBUG and the SDK will print information about the communication with the server.
logging.basicConfig(level=logging.INFO, stream=sys.stdout)

# 1. Set user attributes such as secret_id, secret_key, and region. Appid has been removed from CosConfig and thus needs to be specified in Bucket, which is formatted as BucketName-Appid.
secret_id = os.environ['COS_SECRET_ID'] # User `SecretId`. We recommend you use a sub-account key and follow the principle of least privilege to reduce risks. For information about how to obtain a sub-account key, visit https://www.tencentcloud.com/document/product/598/32675.
secret_key = os.environ['COS_SECRET_KEY'] # User `SecretKey`. We recommend you use a sub-account key and follow the principle of least privilege to reduce risks. For information about how to obtain a sub-account key, visit https://www.tencentcloud.com/document/product/598/32675.
region = 'ap-beijing' # Replace it with the actual region, which can be viewed in the console at https://console.tencentcloud.com/cos5/bucket.
# For the list of regions supported by COS, visit https://www.tencentcloud.com/document/product/436/6224.
token = None # Token is required for temporary keys but not permanent keys. For more information about how to generate and use a temporary key, visit https://www.tencentcloud.com/document/product/436/14048.
scheme = 'https' # Specify whether to use HTTP or HTTPS protocol to access COS. This field is optional and is `https` by default.

config = CosConfig(Region=region, SecretId=secret_id, SecretKey=secret_key, Token=token, Scheme=scheme)
client = CosS3Client(config)

response = client.copy_object(
Bucket='examplebucket-1250000000',
Key='exampleobject',
CopySource={
'Bucket': 'sourcebucket-1250000000',
'Key': 'exampleobject',
'Region': 'ap-guangzhou'
},
CopyStatus='Replaced',
ContentType='text/plain', # Modify object ContentType.
Metadata={'x-cos-meta-key1': 'value1', 'x-cos-meta-key2': 'value2'} # Modify custom metadata.
)

Parameter description

Parameter
Description
Type
Required
Bucket
Bucket name in the format of BucketName-APPID
String
Yes
Key
Object key, which uniquely identifies an object in a bucket. For example, if an object’s access endpoint is examplebucket-1250000000.cos.ap-guangzhou.myqcloud.com/doc/pic.jpg, its key is doc/pic.jpg.
String
Yes
CopySource
Path of the source object to copy, which contains Bucket, Key, Region, and VersionId
Dict
Yes
CopyStatus
Valid values: Copy: ignores the configured metadata and copies the file directly; Replaced: modifies the metadata according to the configured metadata. If the destination path is identical to the source path, this parameter must be set to Replaced.
String
Yes
ACL
ACL of the object, such as private or public-read
String
No
GrantFullControl
Grants full permission. Format: id="OwnerUin"
String
No
GrantRead
Grants read permission. Format: id="OwnerUin"
String
No
Expires
Expiration time
String
No
CacheControl
Cache policy
String
No
ContentType
Content type
String
No
ContentDisposition
Filename
String
No
ContentEncoding
Encoding type
String
No
ContentLanguage
Language type
String
No
Metadata
User-defined object metadata
Dict
No

Modifying the storage class of an object

If the source and destination objects are the same and CopyStatus is set to Replaced, you can use StorageClass to modify the storage class.

Sample request

# -*- coding=utf-8
from qcloud_cos import CosConfig
from qcloud_cos import CosS3Client
import sys
import os
import logging

# In most cases, set the log level to INFO. If you need to debug, you can set it to DEBUG and the SDK will print information about the communication with the server.
logging.basicConfig(level=logging.INFO, stream=sys.stdout)

# 1. Set user attributes such as secret_id, secret_key, and region. Appid has been removed from CosConfig and thus needs to be specified in Bucket, which is formatted as BucketName-Appid.
secret_id = os.environ['COS_SECRET_ID'] # User `SecretId`. We recommend you use a sub-account key and follow the principle of least privilege to reduce risks. For information about how to obtain a sub-account key, visit https://www.tencentcloud.com/document/product/598/32675.
secret_key = os.environ['COS_SECRET_KEY'] # User `SecretKey`. We recommend you use a sub-account key and follow the principle of least privilege to reduce risks. For information about how to obtain a sub-account key, visit https://www.tencentcloud.com/document/product/598/32675.
region = 'ap-beijing' # Replace it with the actual region, which can be viewed in the console at https://console.tencentcloud.com/cos5/bucket.
# For the list of regions supported by COS, visit https://www.tencentcloud.com/document/product/436/6224.
token = None # Token is required for temporary keys but not permanent keys. For more information about how to generate and use a temporary key, visit https://www.tencentcloud.com/document/product/436/14048.
scheme = 'https' # Specify whether to use HTTP or HTTPS protocol to access COS. This field is optional and is `https` by default.

config = CosConfig(Region=region, SecretId=secret_id, SecretKey=secret_key, Token=token, Scheme=scheme)
client = CosS3Client(config)

response = client.copy_object(
Bucket='examplebucket-1250000000',
Key='exampleobject',
CopySource={
'Bucket': 'examplebucket-1250000000',
'Key': 'exampleobject',
'Region': 'ap-guangzhou'
},
CopyStatus='Replaced',
StorageClass='STANDARD_IA' # Modify the storage class to STANDARD_IA.
)

Sample request with all parameters

response = client.copy_object(
Bucket='examplebucket-1250000000',
Key='exampleobject',
CopySource={
'Bucket': 'sourcebucket-1250000000',
'Key': 'exampleobject',
'Region': 'ap-guangzhou',
'VersionId': 'string'
},
CopyStatus='Copy'|'Replaced',
ACL='private'|'public-read',
GrantFullControl='string',
GrantRead='string',
StorageClass='STANDARD'|'STANDARD_IA',
Expires='string',
CacheControl='string',
ContentType='string',
ContentDisposition='string',
ContentEncoding='string',
ContentLanguage='string',
Metadata={
'x-cos-meta-key1': 'value1',
'x-cos-meta-key2': 'value2'
}
)

Parameter description

Parameter
Description
Type
Required
Bucket
Bucket name in the format of BucketName-APPID
String
Yes
Key
Object key, which uniquely identifies an object in a bucket. For example, if an object’s access endpoint is examplebucket-1250000000.cos.ap-guangzhou.myqcloud.com/doc/pic.jpg, its key is doc/pic.jpg.
String
Yes
CopySource
Path of the source object to copy, which contains Bucket, Key, Region, and VersionId
Dict
Yes
CopyStatus
Valid values: Copy: ignores the configured metadata and copies the file directly; Replaced: modifies the metadata according to the configured metadata. If the destination path is identical to the source path, this parameter must be set to Replaced.
String
Yes
StorageClass
Storage class of the object. Valid values: STANDARD (default); STANDARD_IA.
String
No


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