Feature Description

The app backend can use this callback to monitor whether the number of members in a group has reached the limit for the group. This callback can also be used to delete inactive group members to accept new members.

Precautions

• To enable this callback, you must configure the callback URL and toggle on the corresponding protocol. For details on the configuration method, see Third-Party Callback Configuration.
• Callback direction: the IM backend initiates an HTTP POST request to the app backend.
• After receiving the callback request, the app backend must check whether the SDKAppID contained in the request URL is consistent with its own SDKAppID.
• For other security-related issues, see Third-Party Callback Overview: Security Considerations.

Callback Triggering Scenarios

• An app user requests to join a group through the client.
• An app user is invited to join a group through the client.
• The app admin adds a member to the group through a RESTful API.

Callback Triggering Time

The callback is triggered when the number of group members reaches the limit for the group after a new member is added, or when a new member fails to be added to a group because the number of group members has reached the limit.

API Description

Request URL example

In the following example, the callback URL configured in the app is https://www.example.com.
Example:

https://www.example.com?SdkAppid=$SDKAppID&CallbackCommand=$CallbackCommand&contenttype=json&ClientIP=$ClientIP&OptPlatform=$OptPlatform

Request parameters

Request packet example

{
    "CallbackCommand": "Group.CallbackAfterGroupFull", // Callback command
    "GroupId": "@TGS#2J4SZEAEL" // Group ID
}

Request packet fields

Response packet example

After detecting that the number of group members has reached the limit, the app backend sends a callback response packet.

{
    "ActionStatus": "OK",
    "ErrorInfo": "",
    "ErrorCode": 0 // The result in the response is ignored.
}

Response packet fields

References

• Third-party callback overview
• RESTful APIs: Deleting a group member
• RESTful APIs: Adding a group member