ethics-canvas/canvas/php/check-is-collaborator.php

<?php
    require_once("../../php/db_utils.php");
    
    try {
        // Connect to the database
        $database = db_connect();
        
        // Incoming data
        $canvasId = $_POST["canvas_id"];
        $username = $_POST["username"];
        
        // Declare query
        $query = 'SELECT collaborator FROM collaborators WHERE canvas_id = "' . $canvasId . '" AND collaborator = "' . $username . '";';
        
        // Run query
        $recordSet = db_query_return($database, $query);
        
        // Return the version if it exists
        $record = mysqli_fetch_assoc($recordSet);
        
        $collaborator = $record["collaborator"];
        
        mysqli_free_result($recordSet);
        
        echo($collaborator);
        
        // Close the connection to the database
        db_close($database);
    }
    catch(Exception $e) {
        $errorMsg = $e->getMessage();
        print_r($errorMsg);
    }
?>