<?php
/*
** Copyright (C) 2001-2024 Zabbix SIA
**
** This program is free software: you can redistribute it and/or modify it under the terms of
** the GNU Affero General Public License as published by the Free Software Foundation, version 3.
**
** This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
** without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
** See the GNU Affero General Public License for more details.
**
** You should have received a copy of the GNU Affero General Public License along with this program.
** If not, see <https://www.gnu.org/licenses/>.
**/


class CUploadFile {

	protected $name;
	protected $type;
	protected $tmp_name;
	protected $error;
	protected $size;

	/**
	 * Get upload_max_filesize value in bytes defined in php.ini.
	 * If value is not defined in php.ini, returns default 2M.
	 *
	 * @return int
	 */
	static public function getMaxUploadSize() {
		$maxSize = trim(ini_get('upload_max_filesize'));

		if ($maxSize === '') {
			$maxSize = '2M'; // PHP default value
		}

		return str2mem($maxSize);
	}

	/**
	 * Accepts file array from $_FILES global variable.
	 *
	 * @throws Exception if file_uploads are disabled
	 *
	 * @param $file
	 */
	public function __construct($file) {
		if (!ini_get('file_uploads')) {
			throw new Exception(_('Unable to upload file because "file_uploads" is disabled.'));
		}

		$this->name = $file['name'];
		$this->type = $file['type'];
		$this->tmp_name = $file['tmp_name'];
		$this->error = $file['error'];
		$this->size = $file['size'];
	}

	/**
	 * Get content of uploaded file.
	 *
	 * @throws Exception
	 * @return string
	 */
	public function getContent() {
		if (!$this->isValid()) {
			throw new Exception($this->getErrorMessage());
		}

		return file_get_contents($this->tmp_name);
	}

	/**
	 * Get extension of uploaded file.
	 *
	 * @throws Exception
	 * @return string
	 */
	public function getExtension() {
		if (!$this->isValid()) {
			throw new Exception($this->getErrorMessage());
		}

		return pathinfo($this->name, PATHINFO_EXTENSION);
	}

	/**
	 * Get size in bytes of uploaded file.
	 *
	 * @return int
	 */
	public function getSize() {
		return $this->size;
	}

	/**
	 * Get error.
	 *
	 * @return int
	 */
	public function getError() {
		return $this->error;
	}

	/**
	 * Returns true if file was uploaded without errors.
	 *
	 * @return bool
	 */
	public function isValid() {
		return ($this->error == UPLOAD_ERR_OK);
	}

	/**
	 * Validate image size.
	 *
	 * @throws Exception if image size is 1MB or greater.
	 */
	public function validateImageSize() {
		if ($this->error === UPLOAD_ERR_INI_SIZE || $this->size > ZBX_MAX_IMAGE_SIZE) {
			throw new Exception(_s('Image size must be less than %1$s.', convertUnits([
				'value' => ZBX_MAX_IMAGE_SIZE,
				'units' => 'B'
			])));
		}
	}

	/**
	 * Return true if file was uploaded, maybe with errors.
	 *
	 * @return bool
	 */
	public function wasUploaded() {
		return ($this->error != UPLOAD_ERR_NO_FILE);
	}

	/**
	 * Get error message.
	 *
	 * @return string
	 */
	protected function getErrorMessage() {
		switch ($this->error) {
			case UPLOAD_ERR_OK:
				return '';

			case UPLOAD_ERR_INI_SIZE:
				return _s('File is too big, max upload size is %1$s bytes.', self::getMaxUploadSize());

			case UPLOAD_ERR_NO_FILE:
				return _('No file was uploaded.');

			default:
				return _('Incorrect file upload.');
		}
	}
}
