Replacement for sendy's upload.php that sends files to S3 rather than the server.

upload.php

<?php
error_reporting(E_ALL);
ini_set('display_errors', 1);

include('../functions.php');
include('../login/auth.php');
require_once('../helpers/S3.php');

if (!isset($_FILES['upload'])) {
    die('No file uploaded');
}

// Init
$file = $_FILES['upload']['tmp_name'];
$fileName = $_FILES['upload']['name'];
$uploadError = $_FILES['upload']['error'];

if ($uploadError !== UPLOAD_ERR_OK) {
    switch ($uploadError) {
        case UPLOAD_ERR_INI_SIZE:
            $message = "The uploaded file exceeds the upload_max_filesize directive in php.ini.";
            break;
        case UPLOAD_ERR_FORM_SIZE:
            $message = "The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form.";
            break;
        case UPLOAD_ERR_PARTIAL:
            $message = "The uploaded file was only partially uploaded.";
            break;
        case UPLOAD_ERR_NO_FILE:
            $message = "No file was uploaded.";
            break;
        case UPLOAD_ERR_NO_TMP_DIR:
            $message = "Missing a temporary folder.";
            break;
        case UPLOAD_ERR_CANT_WRITE:
            $message = "Failed to write file to disk.";
            break;
        case UPLOAD_ERR_EXTENSION:
            $message = "File upload stopped by extension.";
            break;
        default:
            $message = "Unknown upload error.";
            break;
    }
    die($message);
}

$extension_explode = explode('.', $fileName);
$extension = end($extension_explode);
$time = time();
$allowed = array("jpeg", "jpg", "gif", "png");

if (!in_array($extension, $allowed)) {
    die('File not allowed');
}

$awsAccessKey = get_app_info('s3_key');
$awsSecretKey = get_app_info('s3_secret');
if (!$awsAccessKey || !$awsSecretKey) {
    die('AWS credentials are missing');
}

$bucketName = 'YOUR_BUCKET_NAME'; //change to your bucket name
$endpoint = 's3.us-east-1.amazonaws.com'; //change as appropriate

try {
    $s3 = new S3($awsAccessKey, $awsSecretKey, false, $endpoint);
} catch (Exception $e) {
    die('Failed to initialize S3: ' . $e->getMessage());
}

$s3Filename = 'images/' . $time . basename($fileName); //added path to images folder on S3 bucket

// Additional debugging
echo "<script type='text/javascript'>console.log('Attempting to upload to S3: $s3Filename');</script>";

try {
    if (!file_exists($file)) {
        throw new Exception('Temporary file does not exist');
    }
    if (filesize($file) === 0) {
        throw new Exception('Temporary file is empty');
    }

    // Logging file details for debugging
    echo "<script type='text/javascript'>console.log('File exists: " . file_exists($file) . "');</script>";
    echo "<script type='text/javascript'>console.log('File size: " . filesize($file) . "');</script>";

    $inputFile = $s3->inputFile($file);
    if (!$inputFile) {
        throw new Exception('Unable to create input file for S3 upload');
    }

    // Logging input file details
    echo "<script type='text/javascript'>console.log('Input file: " . json_encode($inputFile) . "');</script>";

    $result = $s3->putObject($inputFile, $bucketName, $s3Filename);
    if ($result) {
        $fileUrl = 'https://' . $bucketName . '.' . $endpoint . '/' . $s3Filename;

        // Additional debugging
        echo "<script type='text/javascript'>console.log('File uploaded successfully. URL: $fileUrl');</script>";

        $funcNum = $_GET['CKEditorFuncNum'];
        $CKEditor = $_GET['CKEditor'];
        $langCode = $_GET['langCode'];
        $message = '';

        echo "<script type='text/javascript'>window.parent.CKEDITOR.tools.callFunction($funcNum, '$fileUrl', '$message');</script>";
    } else {
        throw new Exception('S3 upload failed');
    }
} catch (Exception $e) {
    $errorMessage = $e->getMessage();
    error_log('Failed to upload to S3: ' . $errorMessage);
    echo "<script type='text/javascript'>console.log('Error: $errorMessage');</script>";
    die('Failed to upload to S3: ' . $errorMessage);
}