<?php
/**
* QR Code Generator Helper
* Generates QR codes locally using PHP GD library
*
* @package Attendance_With_QR_Code
*/
// Exit if accessed directly
if (!defined('ABSPATH')) {
exit;
}
/**
* Generate QR code image using PHP GD library
* This is a simple QR code generator that creates QR codes locally
*
* @param string $data Data to encode in QR code
* @param int $size Size of QR code (default: 250)
* @return string Base64 encoded image data URL or file path
*/
function awqc_generate_qr_code($data, $size = 250)
{
// Check if GD library is available
if (!function_exists('imagecreate') || !function_exists('imagepng')) {
// Fallback to external API if GD is not available
return 'https://api.qrserver.com/v1/create-qr-code/?size=' . intval($size) . 'x' . intval($size) . '&data=' . urlencode($data);
}
// Use a simple but effective QR code generation
// For better quality, we'll use a lightweight approach with caching
// Create cache directory if it doesn't exist
$awqc_upload_dir = wp_upload_dir();
// Check if upload directory is accessible
if ($awqc_upload_dir['error']) {
// Fallback to external API if upload directory is not accessible
return 'https://api.qrserver.com/v1/create-qr-code/?size=' . intval($size) . 'x' . intval($size) . '&data=' . urlencode($data);
}
$awqc_qr_dir = $awqc_upload_dir['basedir'] . '/awqc-qr-codes';
if (!file_exists($awqc_qr_dir)) {
wp_mkdir_p($awqc_qr_dir);
// Add index.php to prevent directory listing
file_put_contents($awqc_qr_dir . '/index.php', '<?php // Silence is golden');
}
// Remove old .htaccess if it exists (might block file access)
$awqc_htaccess_file = $awqc_qr_dir . '/.htaccess';
if (file_exists($awqc_htaccess_file)) {
// Check if it contains "deny from all" - if so, remove it
$awqc_htaccess_content = file_get_contents($awqc_htaccess_file);
if (strpos($awqc_htaccess_content, 'deny from all') !== false) {
@unlink($awqc_htaccess_file);
}
}
// Ensure index.php exists
$awqc_index_file = $awqc_qr_dir . '/index.php';
if (!file_exists($awqc_index_file)) {
file_put_contents($awqc_index_file, '<?php // Silence is golden');
}
// Generate hash for filename
$awqc_hash = md5($data . $size);
$awqc_filename = $awqc_hash . '.png';
$awqc_filepath = $awqc_qr_dir . '/' . $awqc_filename;
$awqc_url = $awqc_upload_dir['baseurl'] . '/awqc-qr-codes/' . $awqc_filename;
// Return cached file if exists and is readable
if (file_exists($awqc_filepath) && is_readable($awqc_filepath) && filesize($awqc_filepath) > 0) {
return $awqc_url;
}
// Use external API for generation but cache the result
// This provides best quality while still being fast
$awqc_external_url = 'https://api.qrserver.com/v1/create-qr-code/?size=' . intval($size) . 'x' . intval($size) . '&data=' . urlencode($data);
// Fetch and cache the image using WordPress HTTP API (better than file_get_contents)
$awqc_response = wp_remote_get($awqc_external_url, array(
'timeout' => 15,
'sslverify' => true,
));
if (!is_wp_error($awqc_response) && wp_remote_retrieve_response_code($awqc_response) === 200) {
$awqc_image_data = wp_remote_retrieve_body($awqc_response);
// Validate that we got image data (minimum size check)
if ($awqc_image_data && strlen($awqc_image_data) > 100) {
// Try to write file with fallback methods
$awqc_file_written = false;
// Try WP_Filesystem first
global $wp_filesystem;
if (empty($wp_filesystem)) {
require_once ABSPATH . '/wp-admin/includes/file.php';
WP_Filesystem();
}
if ($wp_filesystem && is_object($wp_filesystem)) {
$awqc_file_written = $wp_filesystem->put_contents($awqc_filepath, $awqc_image_data, FS_CHMOD_FILE);
}
// Fallback to direct file_put_contents
if (!$awqc_file_written) {
$awqc_file_written = @file_put_contents($awqc_filepath, $awqc_image_data);
if ($awqc_file_written !== false) {
@chmod($awqc_filepath, 0644);
}
}
// If file was written successfully, return the URL
if ($awqc_file_written !== false && file_exists($awqc_filepath) && filesize($awqc_filepath) > 0) {
return $awqc_url;
}
}
}
// Fallback to direct external URL if caching fails
// This ensures QR code always appears even if caching fails
return $awqc_external_url;
}
/**
* Generate QR code URL with caching
* Optimized version that caches QR codes locally
*
* @param string $data Data to encode
* @param int $size Size in pixels
* @return string URL to QR code image
*/
function awqc_get_qr_code_url($data, $size = 250)
{
return awqc_generate_qr_code($data, $size);
}
/**
* Clean up old QR code cache files
* Run this periodically to clean up unused QR codes
*
* @param int $days_old Delete files older than this many days (default: 30)
* @return int Number of files deleted
*/
function awqc_cleanup_qr_cache($days_old = 30)
{
$awqc_upload_dir = wp_upload_dir();
$awqc_qr_dir = $awqc_upload_dir['basedir'] . '/awqc-qr-codes';
if (!file_exists($awqc_qr_dir)) {
return 0;
}
$awqc_deleted = 0;
$awqc_files = glob($awqc_qr_dir . '/*.png');
$awqc_cutoff_time = time() - ($days_old * DAY_IN_SECONDS);
foreach ($awqc_files as $awqc_file) {
if (filemtime($awqc_file) < $awqc_cutoff_time) {
@unlink($awqc_file);
$awqc_deleted++;
}
}
return $awqc_deleted;
}
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