<?php

namespace PhpOffice\PhpSpreadsheet\Helper;

use PhpOffice\PhpSpreadsheet\Exception;

class Downloader
{
    protected string $filepath;

    protected string $filename;

    protected string $filetype;

    protected const CONTENT_TYPES = [
        'xlsx' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
        'xls' => 'application/vnd.ms-excel',
        'ods' => 'application/vnd.oasis.opendocument.spreadsheet',
        'csv' => 'text/csv',
        'html' => 'text/html',
        'pdf' => 'application/pdf',
    ];

    public function __construct(string $folder, string $filename, ?string $filetype = null)
    {
        if ((is_dir($folder) === false) || (is_readable($folder) === false)) {
            throw new Exception("Folder {$folder} is not accessable");
        }
        $filepath = "{$folder}/{$filename}";
        $this->filepath = (string) realpath($filepath);
        $this->filename = basename($filepath);
        if ((file_exists($this->filepath) === false) || (is_readable($this->filepath) === false)) {
            throw new Exception("{$this->filename} not found, or cannot be read");
        }

        $filetype ??= pathinfo($filename, PATHINFO_EXTENSION);
        if (array_key_exists(strtolower($filetype), self::CONTENT_TYPES) === false) {
            throw new Exception("Invalid filetype: {$filetype} cannot be downloaded");
        }
        $this->filetype = strtolower($filetype);
    }

    public function download(): void
    {
        $this->headers();

        readfile($this->filepath);
    }

    public function headers(): void
    {
        ob_clean();

        $this->contentType();
        $this->contentDisposition();
        $this->cacheHeaders();
        $this->fileSize();

        flush();
    }

    protected function contentType(): void
    {
        header('Content-Type: ' . self::CONTENT_TYPES[$this->filetype]);
    }

    protected function contentDisposition(): void
    {
        header('Content-Disposition: attachment;filename="' . $this->filename . '"');
    }

    protected function cacheHeaders(): void
    {
        header('Cache-Control: max-age=0');
        // If you're serving to IE 9, then the following may be needed
        header('Cache-Control: max-age=1');

        // If you're serving to IE over SSL, then the following may be needed
        header('Expires: Mon, 26 Jul 1997 05:00:00 GMT'); // Date in the past
        header('Last-Modified: ' . gmdate('D, d M Y H:i:s') . ' GMT'); // always modified
        header('Cache-Control: cache, must-revalidate'); // HTTP/1.1
        header('Pragma: public'); // HTTP/1.0
    }

    protected function fileSize(): void
    {
        header('Content-Length: ' . filesize($this->filepath));
    }
}

• [F] Dimension.php
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• [F] Downloader.php
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• [F] Handler.php
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• [F] Html.php
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• [F] Sample.php
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• [F] Size.php
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• [F] TextGrid.php
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About Section

About NFC Pay: Our Story and Mission

NFC Pay was founded with a vision to transform the way people handle transactions. Our journey is defined by a commitment to innovation, security, and convenience. We strive to deliver seamless, user-friendly payment solutions that make everyday transactions effortless and secure. Our mission is to empower you to pay with ease and confidence, anytime, anywhere.

• Simplifying Payments, One Tap at a Time.
• Reinventing Your Wallet for Modern Convenience.
• Smart Payments for a Effortless Lifestyle.
• Experience the Ease of Tap and Pay.
• Innovative Solutions for Your Daily Transactions.

FAQ Section

Frequently Asked Questions About NFC Pay

Here are answers to some common questions about NFC Pay. We aim to provide clear and concise information to help you understand how our platform works and how it can benefit you. If you have any further inquiries, please don’t hesitate to contact our support team.

How do I register for NFC Pay?

Download the app and sign up using your email or phone number, then complete the verification process.

Is my payment information secure?

Yes, we use advanced encryption and security protocols to protect your payment details.

Can I add multiple cards to my NFC Pay wallet?

Absolutely, you can link multiple debit or credit cards to your wallet.

How do I transfer money to another user?

Go to the transfer section, select the recipient, enter the amount, and authorize the transfer.

What should I do if I forget my PIN?

Use the “Forgot PIN” feature in the app to reset it following the provided instructions.

How can I activate my merchant account?

Sign up for a merchant account through the app and follow the setup instructions to start accepting payments.

Can I track my payment status?

Yes, you can view and track your payment status in the account dashboard