Help Center/ Simple Message Notification/ API Reference/ APIs/ Topics/ Updating a Topic Policy
Updated on 2025-08-22 GMT+08:00
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Updating a Topic Policy

Function

This API is used to update a topic policy.

Calling Method

For details, see Calling APIs.

URI

PUT /v2/{project_id}/notifications/topics/{topic_urn}/attributes/{name}

Table 1 Path Parameters

Parameter

Mandatory

Type

Description

project_id

Yes

String

Specifies the project ID.For details about how to obtain the project ID, see Obtaining the Project ID.

topic_urn

Yes

String

Specifies the resource identifier of the topic, which is unique. To obtain the resource identifier, see Querying Topics.

name

Yes

String

Specifies the topic policy name.Only specified policy names are supported. For details, see Topic Attribute List.

Request Parameters

Table 2 Request header parameters

Parameter

Mandatory

Type

Description

X-Auth-Token

Yes

String

Specifies a user token.

It can be obtained by calling an IAM API. The value of X-Subject-Token in the response header is the user token.
Table 3 Request body parameters

Parameter

Mandatory

Type

Description

value

Yes

String

  1. If you set name to access_policy, value is the topic attribute, and the maximum length of value is 30 KB.

  2. If you set name to introduction, value is the topic introduction, and the maximum length of value is 120 bytes.

Response Parameters

Status code: 200

Table 4 Response body parameters

Parameter

Type

Description

request_id

String

Specifies the request ID, which is unique.

Status code: 400

Table 5 Response body parameters

Parameter

Type

Description

request_id

String

Specifies the request ID, which is unique.

code

String

Specifies the error code.

message

String

Describes the error message.

Status code: 403

Table 6 Response body parameters

Parameter

Type

Description

request_id

String

Specifies the request ID, which is unique.

code

String

Specifies the error code.

message

String

Describes the error message.

Status code: 404

Table 7 Response body parameters

Parameter

Type

Description

request_id

String

Specifies the request ID, which is unique.

code

String

Specifies the error code.

message

String

Describes the error message.

Status code: 500

Table 8 Response body parameters

Parameter

Type

Description

request_id

String

Specifies the request ID, which is unique.

code

String

Specifies the error code.

message

String

Describes the error message.

Example Requests

  • Updating a topic policy

    PUT https://{SMN_Endpoint}/v2/{project_id}/notifications/topics/{topic_urn}/attributes/access_policy

{
  "value" : "{\"Version\":\"2016-09-07\",\"Id\":\"__default_policy_ID\",\"Statement\":[{\"Sid\":\"__user_pub_0\",\"Effect\":\"Allow\",\"Principal\":{\"CSP\":[\"urn:csp:iam::{domainID}:root\"]},\"Action\":[\"SMN:Publish\",\"SMN:QueryTopicDetail\"],\"Resource\":\"{topic_urn}\"},{\"Sid\":\"__org_path_pub_0\",\"Effect\":\"Allow\",\"Principal\":{\"OrgPath\":[\"o-bf966fe82ebb4d35d68b791729228788/r-001ebf32880a13eabfc8e1c37eee3ae9/ou-0dbfffe92fd92ddb35feff9b4079459c\"]},\"Action\":[\"SMN:Publish\",\"SMN:QueryTopicDetail\"],\"Resource\":\"{topic_urn}\"},{\"Sid\":\"__service_pub_0\",\"Effect\":\"Allow\",\"Principal\":{\"Service\":[\"obs\"]},\"Action\":[\"SMN:Publish\",\"SMN:QueryTopicDetail\"],\"Resource\":\"{topic_urn}\"}]}"
}

  • Updating a topic policy

    PUT https://{SMN_Endpoint}/v2/{project_id}/notifications/topics/{topic_urn}/attributes/introduction

{
  "value" : ""
}

Example Responses

Status code: 200

OK

{
  "request_id" : "6837531fd3f54550927b930180a706bf"
}

Status Codes

Status Code

Description

200

OK

400

Bad Request

403

Unauthorized

404

Not Found

500

Internal Server Error

Error Codes

See Error Codes.

Parent topic: Topics