Callback Before Message Push in Online Status

Function Description

Before sending messages to the client, the App business server can receive the request of sending messages through this callback. The business server can intercept, modify, or add additional push information to the message as needed.

Precautions

• To enable the callback, a callback URL must be configured, and the switch corresponding to this callback protocol must be turned on. See the Callback Instructions document for configuration methods.
• The direction of the callback is an HTTP/HTTPS POST request initiated by OpenIM Server to the App backend.
• After receiving the callback request, the App business server needs to respond within the timeout period.

Scenarios That May Trigger This Callback

• Group member leaves the group.
• Group member is removed from the group.
• Dissolution of the group.

Timing of the Callback

• Before OpenIM Server prepares to push messages to the client.

Interface Description

Request URL Example

In the following example, the callback URL configured by the App is https://callbackurl.

https://callbackurl?command=$CallbackCommand&contenttype=json

Request Parameters Description

Parameter	Description
https	Request protocol is HTTPS, and the method is POST
https://callbackurl	Callback URL
CallbackCommand	Fixed value: callbackBeforePushCommand
contenttype	Fixed value: JSON

Header

Header Name	Example Value	Mandatory	Type	Description
operationID	1646445464564	Required	string	operationID is used for global link tracking

Request Packet Example

{
  "callbackCommand": "callbackBeforePushCommand",
  "platformID": 1,
  "platform": "iOS",
  "userIDList": ["user123", "user456"],
  "title": "New Message",
  "desc": "You have a new message",
  "ex": "Extra push info",
  "iOSPushSound": "default",
  "iOSBadgeCount": true,
  "signalInfo": "Signal data",
  "clientMsgID": "msg123",
  "sendID": "user789",
  "groupID": "group123",
  "contentType": 1,
  "sessionType": 2,
  "atUserIDList": ["user101", "user102"],
  "content": "Hello, this is a test message"
}

Request Packet Fields Explanation

Field	Type	Description
callbackCommand	string	Callback command, here it is the callback before message push
platformID	int	Platform ID (e.g., 1 for iOS, 2 for Android)
platform	string	Platform name (e.g., iOS, Android)
userIDList	array	List of user IDs who will receive this message
title	string	Title of the push message
desc	string	Description or main content of the push message
ex	string	Extra push information
iOSPushSound	string	Sound used for push messages on iOS devices
iOSBadgeCount	boolean	Whether to show the number of unread messages on the iOS app icon
signalInfo	string	Additional signal data for transmitting extra information
clientMsgID	string	Client message ID
sendID	string	Sender ID
groupID	string	Group ID (if the message is sent to a group)
contentType	int	ID of the message content type
sessionType	int	ID of the session type
atUserIDList	array	List of user IDs who are mentioned in the message
content	string	Content of the message being sent

Response Packet Example

Allow Push

Allow the message to be pushed to the client.

{
    "actionCode": 0,
    "errCode": 0,
    "errMsg": "",
    "errDlt": "",
    "nextCode": "",
    "userIDList": ["user123", "user456"],
    "offlinePushInfo": {
        "title": "New Message",
        "desc": "You have a new message",
        "ex": "Extra push info",
        "iOSPushSound": "default",
        "iOSBadgeCount": true,
        "signalInfo": "Signal data"
    }
}

Response Packet Fields Explanation

Field	Type	Description
actionCode	0	Indicates whether the business system callback was executed correctly. 0 means the operation was successful.
errCode	5001	Indicates a custom error code, ranging between 5000-9999. Set when actionCode is not 0; set when nextCode is 1.
errMsg	"An error message"	Simple error message corresponding to the custom error code.
errDlt	"Detailed error information"	Detailed error information corresponding to the custom error code.
nextCode	1	Next step instruction, 1 indicates refusal to continue execution, set when actionCode is 0.
userIDList	array	List of user IDs allowed to receive the message.
offlinePushInfo	object	Object of offline push information.