web/functions/core.php

<?php
require_once 'init.php';

use Postmark\PostmarkClient;

if (!empty($_FILES['upload']))
    upload($_FILES['upload'], $_ENV['UPLOAD_TMP_FQ_PATH'], isset($_POST['filename']) ? $_POST['filename'] : null);

/*
 * @* @param int $mode 0 for User, 1 for Post, 2 for Space
 */
function randomId(int $mode)
{
    $id = rand(10000000, 999999999);
    switch ($mode) {
        case 0:
            if (User::exists($id))
                return randomId($mode);
            else
                return $id;
        case 1:
            if (Post::exists($id))
                return randomId($mode);
            else
                return $id;
        case 2:
            if (Space::exists($id))
                return randomId($mode);
            else
                return $id;
    }
}

function notify_users($emails, $auther_username, $article_id, $article_title, $excerpt)
{
    foreach ($emails as $email) {
        $email_html = '
            <h1>' . $article_title . '</h1>
            <p>An author you follow just published a new article! Read it <a href="https://vintagecoding.net/articles.php?view=read&article_id=' . $article_id . '" target="_blank">here</a></p>
            <p><strong>Here is a snippet from the article!</strong></p>
            <p>' . $excerpt . '</p>
        ';

        $client = new PostmarkClient($_ENV['POSTMARK_API_TOKEN']);

        $client->sendEmail(
            'mailer@joshashton.dev',
            $email,
            $auther_username . ' just published a new article! - vintagecoding.net',
            $email_html
        );
    }
}

function delete_dir($dir)
{
    if (!is_dir($dir))
        return false;

    if (substr($dir, strlen($dir) - 1, 1) != '/') {
        $dir .= '/';
    }
    $files = glob($dir . '*', GLOB_MARK);
    foreach ($files as $file) {
        if (is_dir($file))
            delete_dir($file);
        else
            delete_file($file);
    }
    rmdir($dir);
}

function delete_file($file)
{
    if (!file_exists($file))
        return false;

    unlink($file);
}

function upload($input, $dest_dir, $filename = null)
{
    $filetype = strtolower(pathinfo($input['name'], PATHINFO_EXTENSION));

    switch ($filetype) {
        case 'png':
        case 'jpg':
        case 'jpeg':
            if (check_image_upload($dest_dir, $filetype, $input))
                move_uploaded_file($input['tmp_name'], $dest_dir . ($filename ? $filename . '.' . $filetype : $input['name']));
            else
                return '';
            break;
        case 'csv':
            if (check_csv_upload($input))
                move_uploaded_file($input['tmp_name'], $dest_dir . ($filename ? $filename . '.' . $filetype : $input['name']));
            else
                return '';

            break;
        default:
            // code...
            break;
    }

    if ($filename)
        return basename($filename . '.' . $filetype);
    else
        return basename($input['name'] . '.' . $filetype);
}

function crop_image($img_path, $x, $y, $height, $width)
{
    // $dest = $_ENV['UPLOAD_TMP_FQ_PATH'];
    $dest = '/tmp/';
    // Get the image type
    $imageType = exif_imagetype($img_path);

    // Create an image resource from the source image
    switch ($imageType) {
        case IMAGETYPE_JPEG:
            $sourceImage = imagecreatefromjpeg($img_path);
            break;
        case IMAGETYPE_PNG:
            $sourceImage = imagecreatefrompng($img_path);
            break;
        default:
            return false;  // Unsupported image type
    }

    if (!$sourceImage)
        return false;  // Failed to create image resource

    // Create a new image resource for the cropped image
    $croppedImage = imagecreatetruecolor($width, $height);

    // Copy the cropped portion from the source image to the destination image
    imagecopy($croppedImage, $sourceImage, 0, 0, $x, $y, $width, $height);

    // Save the cropped image to the destination path
    switch ($imageType) {
        case IMAGETYPE_JPEG:
            imagejpeg($croppedImage, $img_path);
            break;
        case IMAGETYPE_PNG:
            imagepng($croppedImage, $dest);
            break;
        case IMAGETYPE_GIF:
            imagegif($croppedImage, $dest);
            break;
    }

    // Free up memory
    imagedestroy($sourceImage);
    imagedestroy($croppedImage);

    return true;  // Cropping successful
}

/*
 * Reads in file contents and stores as a single string.
 */
function read_file_one_string($file_path)
{
    $fs = fopen($file_path, 'r');
    $string = fread($fs, filesize($file_path));
    return $string;
}

function read_file($file_path)
{
    $fs = fopen($file_path, 'r');
    return $fs;
}

function extract_content_from_tag($string, $start, $end)
{
    $ini = strpos($string, $start);
    if ($ini != 0)
        return 'nope';

    $ini += strlen($start);
    $len = strpos($string, $end, $ini) - $ini;
    return substr($string, $ini, $len);
}

function check_image_upload($target, $filetype, $image)
{
    return true;
}

function check_csv_upload($target)
{
    return true;
}

function pretty_dump($arr)
{
    ob_start();
    echo '<pre>';
    print_r($arr);
    echo '</pre>';
    return ob_get_clean();
}

function format_date($date)
{
    return (explode(' ', $date))[0];
}