BuddyPress.org

After checking, I found that the endpoint did not verify user rights at all, and in fact, it did not handle the user_id mentioned in the handbook at all for creating activities.

As a patch, I asked AI to help me generate a plug-in. Anyone who needs it can directly store the following code as a PHP and upload it to the plugins:

Allow administrators to create dynamics for other users through API:

<?php
/**
 * Plugin Name: Admin API activity creates privilege
 * Description: Allows administrators to create activities on behalf of other users.
 * Version: 1.0.4
 * Author: Google Gemini Pro
 */

//Allow administrators to create activities on behalf of other users
add_filter( 'bp_rest_activity_create_item_permissions_check', function( $retval, $request ) {
    if ( current_user_can( 'manage_options' ) ) {
        $retval = true;
    }
    return $retval;
}, 10, 2 );

//Properly handle the user_id parameter when creating an activity
add_filter( 'bp_activity_before_save', function( $activity_data ) {
    //Get request body content
    $body = file_get_contents('php://input');

    //Parse JSON data
    $data = json_decode( $body, true );

    //Check whether the user_id parameter exists
    if ( isset( $data['user_id'] ) && get_userdata( $data['user_id'] ) ) {
        //Modify the user_id property of the $activity_data object
        $activity_data->user_id = $data['user_id']; 
    }

    return $activity_data;
} );

Allow administrators to obtain other users ‘XProfiles through API:

<?php
/**
 * Plugin Name: BuddyPress Admin API read XProfile privilege
 * Description: Allows administrators to read any user's XProfile data regardless of field visibility settings.
 * Version: 1.0.0
 * Author: Google Gemini Pro
 */

//Allow administrators to read all XProfile data
add_filter( 'bp_rest_xprofile_data_get_item_permissions_check', function( $retval, $request ) {
    if ( current_user_can( 'manage_options' ) ) {
        //Check whether the field exists
        $field = xprofile_get_field( $request->get_param( 'field_id' ) );
        if ( $field ) {
            //Check whether the user exists
            $user = get_userdata( $request->get_param( 'user_id' ) );
            if ( $user ) {
                $retval = true;
            } else {
                $retval = new WP_Error(
                    'bp_rest_member_invalid_id',
                    __( 'Invalid member ID.', 'buddypress' ),
                    array( 'status' => 404 )
                );
            }
        } else {
            $retval = new WP_Error(
                'bp_rest_invalid_id',
                __( 'Invalid field ID.', 'buddypress' ),
                array( 'status' => 404 )
            );
        }
    }
    return $retval;
}, 10, 2 );

I am pretty sure this is a bug, or the API handbook has not been maintained for many years. In the long run, maybe someone should fix these issues in the core program rather than using the temporary plugins I provide.