Updated on 2026-09-02 GMT+08:00

Obtaining the Backup File URL

Function

This API is used to obtain the download links of backup files.

Calling Method

For details, see Calling APIs.

Authorization Information

Each account has all the permissions required to call all APIs, but IAM users must be assigned the required permissions.

  • If you are using role/policy-based authorization, see Permissions Policies and Supported Actions for details on the required permissions.
  • If you are using identity policy-based authorization, the following identity policy-based permissions are required.

    Action

    Access Level

    Resource Type (*: required)

    Condition Key

    Alias

    Dependencies

    dcs:instance:downloadBackupData

    Read

    instance *

    • g:EnterpriseProjectId

    • g:ResourceTag/<tag-key>

    -

    -

URI

POST /v2/{project_id}/instances/{instance_id}/backups/{backup_id}/links

Table 1 Path Parameters

Parameter

Mandatory

Type

Description

project_id

Yes

String

Definition:

Project ID. For details, see Obtaining a Project ID.

Constraints:

N/A

Range:

N/A

Default Value:

N/A

instance_id

Yes

String

Definition:

Instance ID. It can be viewed on the instance details page on the DCS console.

Constraints:

N/A

Range:

N/A

Default Value:

N/A

backup_id

Yes

String

Definition

Backup record ID. The value of response parameter backup_id can be obtained by calling the API for Listing DCS Instance Backup Records.

Constraints

N/A

Range

N/A

Default Value

N/A

Request Parameters

Table 2 Request body parameters

Parameter

Mandatory

Type

Description

expiration

Yes

Integer

Definition:

Validity period of a URL.

Constraints:

The value must be within 5 minutes and 24 hours.

Range:

N/A

Default Value:

N/A

Response Parameters

Status code: 200

Table 3 Response body parameters

Parameter

Type

Description

file_path

String

Definition:

Paths of files in the OBS bucket.

Range:

N/A

bucket_name

String

Definition:

OBS bucket name.

Range:

N/A

links

Array of LinksItem objects

Definition:

Collection of URLs for downloading backup files. A maximum of 64 links are allowed.

Table 4 LinksItem

Parameter

Type

Description

file_name

String

Definition:

Backup file name.

Range:

N/A

link

String

Definition:

URL for downloading backup files.

Range:

N/A

Status code: 400

Table 5 Response body parameters

Parameter

Type

Description

error_msg

String

Definition:

Error message.

Range:

N/A

error_code

String

Definition:

Error code.

Range:

For details, see Error Codes.

error_ext_msg

String

Definition

Extended error information. This parameter is not used currently and is not returned.

Range

N/A

Status code: 500

Table 6 Response body parameters

Parameter

Type

Description

error_msg

String

Definition:

Error message.

Range:

N/A

error_code

String

Definition:

Error code.

Range:

For details, see Error Codes.

error_ext_msg

String

Definition

Extended error information. This parameter is not used currently and is not returned.

Range

N/A

Example Requests

Obtaining the download links of backup files with 1800s validity

POST https://{dcs_endpoint}/v2/{project_id}/instances/{instance_id}/backups/{backup_id}/links

{
  "expiration" : 1800
}

Example Responses

Status code: 200

Successfully obtained backup file URLs.

{
  "file_path" : "42489641-23c4-4855-bc89-befc85e2b7f7/ddfe5f66-a965-43ff-aec7-f3b489dc071b/",
  "bucket_name" : "bucket5da9cf3bfabc4cae9023695b934e5e2b",
  "links" : [ {
    "file_name" : "redis_192.168.63.250_6379_10923-16383_20190820211816.rdb",
    "link" : "https://bucket5da9cf3bfabc4cae9023695b934e5e2b.{obs_endpoint}:443/42489641-23c4-4855-bc89-befc85e2b7f7/ddfe5f66-a965-43ff-aec7-f3b489dc071b/redis_192.168.63.250_6379_10923-16383_20190820211816.rdb?AWSAccessKeyId=VD8CEQNG8VMQODUAAM0D&Expires=1566308915&Signature=s3I%2BrLbo%2BFZw%2BUsjVere%2FOQdKEg%3D"
  } ]
}

SDK Sample Code

The SDK sample code is as follows.

Java

Obtaining the download links of backup files with 1800s validity

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package com.huaweicloud.sdk.test;

import com.huaweicloud.sdk.core.auth.ICredential;
import com.huaweicloud.sdk.core.auth.BasicCredentials;
import com.huaweicloud.sdk.core.exception.ConnectionException;
import com.huaweicloud.sdk.core.exception.RequestTimeoutException;
import com.huaweicloud.sdk.core.exception.ServiceResponseException;
import com.huaweicloud.sdk.dcs.v2.region.DcsRegion;
import com.huaweicloud.sdk.dcs.v2.*;
import com.huaweicloud.sdk.dcs.v2.model.*;


public class ListBackupFileLinksSolution {

    public static void main(String[] args) {
        // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
        // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
        String ak = System.getenv("CLOUD_SDK_AK");
        String sk = System.getenv("CLOUD_SDK_SK");
        String projectId = "{project_id}";

        ICredential auth = new BasicCredentials()
                .withProjectId(projectId)
                .withAk(ak)
                .withSk(sk);

        DcsClient client = DcsClient.newBuilder()
                .withCredential(auth)
                .withRegion(DcsRegion.valueOf("<YOUR REGION>"))
                .build();
        ListBackupFileLinksRequest request = new ListBackupFileLinksRequest();
        request.withInstanceId("{instance_id}");
        request.withBackupId("{backup_id}");
        DownloadBackupFilesReq body = new DownloadBackupFilesReq();
        body.withExpiration(1800);
        request.withBody(body);
        try {
            ListBackupFileLinksResponse response = client.listBackupFileLinks(request);
            System.out.println(response.toString());
        } catch (ConnectionException e) {
            e.printStackTrace();
        } catch (RequestTimeoutException e) {
            e.printStackTrace();
        } catch (ServiceResponseException e) {
            e.printStackTrace();
            System.out.println(e.getHttpStatusCode());
            System.out.println(e.getRequestId());
            System.out.println(e.getErrorCode());
            System.out.println(e.getErrorMsg());
        }
    }
}

Python

Obtaining the download links of backup files with 1800s validity

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# coding: utf-8

import os
from huaweicloudsdkcore.auth.credentials import BasicCredentials
from huaweicloudsdkdcs.v2.region.dcs_region import DcsRegion
from huaweicloudsdkcore.exceptions import exceptions
from huaweicloudsdkdcs.v2 import *

if __name__ == "__main__":
    # The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
    # In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
    ak = os.environ["CLOUD_SDK_AK"]
    sk = os.environ["CLOUD_SDK_SK"]
    projectId = "{project_id}"

    credentials = BasicCredentials(ak, sk, projectId)

    client = DcsClient.new_builder() \
        .with_credentials(credentials) \
        .with_region(DcsRegion.value_of("<YOUR REGION>")) \
        .build()

    try:
        request = ListBackupFileLinksRequest()
        request.instance_id = "{instance_id}"
        request.backup_id = "{backup_id}"
        request.body = DownloadBackupFilesReq(
            expiration=1800
        )
        response = client.list_backup_file_links(request)
        print(response)
    except exceptions.ClientRequestException as e:
        print(e.status_code)
        print(e.request_id)
        print(e.error_code)
        print(e.error_msg)

Go

Obtaining the download links of backup files with 1800s validity

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package main

import (
	"fmt"
	"github.com/huaweicloud/huaweicloud-sdk-go-v3/core/auth/basic"
    dcs "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/dcs/v2"
	"github.com/huaweicloud/huaweicloud-sdk-go-v3/services/dcs/v2/model"
    region "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/dcs/v2/region"
)

func main() {
    // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
    // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
    ak := os.Getenv("CLOUD_SDK_AK")
    sk := os.Getenv("CLOUD_SDK_SK")
    projectId := "{project_id}"

    auth, err := basic.NewCredentialsBuilder().
        WithAk(ak).
        WithSk(sk).
        WithProjectId(projectId).
        SafeBuild()

    if err != nil {
        fmt.Println(err)
        return
    }

    hcClient, err := dcs.DcsClientBuilder().
         WithRegion(region.ValueOf("<YOUR REGION>")).
         WithCredential(auth).
         SafeBuild()


    if err != nil {
        fmt.Println(err)
        return
    }

    client := dcs.NewDcsClient(hcClient)

    request := &model.ListBackupFileLinksRequest{}
	request.InstanceId = "{instance_id}"
	request.BackupId = "{backup_id}"
	request.Body = &model.DownloadBackupFilesReq{
		Expiration: int32(1800),
	}
	response, err := client.ListBackupFileLinks(request)
	if err == nil {
        fmt.Printf("%+v\n", response)
    } else {
        fmt.Println(err)
    }
}

More

For SDK sample code of more programming languages, see the Sample Code tab in API Explorer. SDK sample code can be automatically generated.

Status Codes

Status Code

Description

200

Successfully obtained backup file URLs.

400

Invalid request.

500

Internal service error.

Error Codes

See Error Codes.