Programmatically Upload and Unpack ZIP files in WordPress | on https://www.ibenic.com/

form.php

<?php

/**
 * Registering our shortcode
 */

function ibenic_register_upload_form() {
  add_shortcode( 'zip_upload_form', 'ibenic_zip_upload_form' );
}

/**
 * The ZIP upload form.
 * 
 * @param array $atts Shortcode Array
 */
function ibenic_zip_upload_form( $atts ) {
  ob_start();
  ?>
  <form method="POST" action="" enctype="multipart/form-data">
    <?php 
    		wp_nonce_field( 'zip_upload_nonce', 'zip_upload_nonce' );
    ?>
    <input type="file" accept="application/zip" name="uplaod" />
    <button class="submit button" name="upload_file" type="submit">Upload</button>
  </form>
  <?php
  return ob_get_clean();
}

plugin-1.php

<?php
/**
 * Plugin Name: Upload ZIP Form
 * Description: Have a form that will upload ZIP files and unpack them.
 * Author: Igor Benić
 * Author URI: https://ibenic.com
 */

if ( ! defined( 'ABSPATH' ) ) {
	return;
}

class Upload_ZIP_Form {

	protected $errors = null;

	protected $notices = [];

	public function __construct() {
		add_action( 'init', [ $this, 'register' ] );
		add_action( 'init', [ $this, 'upload' ] );
		$this->errors = new WP_Error();
	}

	public function register() {
		add_shortcode( 'zip_upload_form', [ $this, 'form' ] );
	}
}

new Upload_ZIP_Form();

plugin-2.php

<?php
/**
 * Plugin Name: Upload ZIP Form
 * Description: Have a form that will upload ZIP files and unpack them.
 * Author: Igor Benić
 * Author URI: https://ibenic.com
 */

if ( ! defined( 'ABSPATH' ) ) {
	return;
}

class Upload_ZIP_Form {

	// ...

	public function form( $atts ) {
		ob_start();
		if ( $this->notices ) {
			?>
			<ul>
				<?php
				foreach( $this->notices as $notice ) {
					?>
					<li><?php echo $notice; ?></li>
					<?php
				}
				?>
			</ul>
			<?php
		}

		if ( $this->errors->get_error_messages() ) {
			?>
			<ul>
				<?php
				foreach( $this->errors->get_error_messages() as $message ) {
					?>
					<li><?php echo $message; ?></li>
					<?php
				}
				?>
			</ul>
			<?php
		}
		?>
		<form method="POST" action="" enctype="multipart/form-data">
			<?php
			wp_nonce_field( 'zip_upload_nonce', 'zip_upload_nonce' );
			?>
			<input type="file" accept="application/zip" name="file" />
			<button class="submit button" name="upload_file" type="submit">Upload</button>
		</form>
		<?php
		return ob_get_clean();
	}
	
}

new Upload_ZIP_Form();

plugin-3.php

<?php
/**
 * Plugin Name: Upload ZIP Form
 * Description: Have a form that will upload ZIP files and unpack them.
 * Author: Igor Benić
 * Author URI: https://ibenic.com
 */

if ( ! defined( 'ABSPATH' ) ) {
	return;
}

class Upload_ZIP_Form {
  // ....

	public function upload() {
		if ( ! isset( $_POST['zip_upload_nonce'] ) ) {
			return;
		}

		if ( ! wp_verify_nonce( $_POST['zip_upload_nonce'], 'zip_upload_nonce' ) ) {
			return;
		}

		$posted_data =  isset( $_POST ) ? $_POST : array();
		$file_data   = isset( $_FILES ) ? $_FILES : array();
		$data        = array_merge( $posted_data, $file_data );

		include_once 'includes/class-zip-uploader.php';
		$uploader = new ZIP_Uploader( 'zips' );
		$result = $uploader->upload($data );

		if ( is_wp_error( $result ) ) {
			$this->errors->add( $result->get_error_code(), $result->get_error_message() );
		}

		$this->notices[] = 'Uploaded! Path: ' . $result;
	}
}

new Upload_ZIP_Form();

plugin.php

<?php
/**
 * Plugin Name: Upload ZIP Form
 * Description: Have a form that will upload ZIP files and unpack them.
 * Author: Igor Benić
 * Author URI: https://ibenic.com
 */

if ( ! defined( 'ABSPATH' ) ) {
	return;
}

class Upload_ZIP_Form {

	protected $errors = null;

	protected $notices = [];

	public function __construct() {
		add_action( 'init', [ $this, 'register' ] );
		add_action( 'init', [ $this, 'upload' ] );
		$this->errors = new WP_Error();
	}

	public function register() {
		add_shortcode( 'zip_upload_form', [ $this, 'form' ] );
	}

	public function form( $atts ) {
		ob_start();
		if ( $this->notices ) {
			?>
			<ul>
				<?php
				foreach( $this->notices as $notice ) {
					?>
					<li><?php echo $notice; ?></li>
					<?php
				}
				?>
			</ul>
			<?php
		}

		if ( $this->errors->get_error_messages() ) {
			?>
			<ul>
				<?php
				foreach( $this->errors->get_error_messages() as $message ) {
					?>
					<li><?php echo $message; ?></li>
					<?php
				}
				?>
			</ul>
			<?php
		}
		?>
		<form method="POST" action="" enctype="multipart/form-data">
			<?php
			wp_nonce_field( 'zip_upload_nonce', 'zip_upload_nonce' );
			?>
			<input type="file" accept="application/zip" name="file" />
			<button class="submit button" name="upload_file" type="submit">Upload</button>
		</form>
		<?php
		return ob_get_clean();
	}

	public function upload() {
		if ( ! isset( $_POST['zip_upload_nonce'] ) ) {
			return;
		}

		if ( ! wp_verify_nonce( $_POST['zip_upload_nonce'], 'zip_upload_nonce' ) ) {
			return;
		}

		$posted_data =  isset( $_POST ) ? $_POST : array();
		$file_data   = isset( $_FILES ) ? $_FILES : array();
		$data        = array_merge( $posted_data, $file_data );

		include_once 'includes/class-zip-uploader.php';
		$uploader = new ZIP_Uploader( 'zips' );
		$result = $uploader->upload($data );

		if ( is_wp_error( $result ) ) {
			$this->errors->add( $result->get_error_code(), $result->get_error_message() );
		}

		$this->notices[] = 'Uploaded! Path: ' . $result;
	}
}

new Upload_ZIP_Form();

uploader-1.php

<?php


class ZIP_Uploader {

	protected $folder = '';

	public function __construct( $folder ) {
		$this->folder = $folder;
	}

	/**
	 * Get folder name where to upload
	 *
	 * @param $post_id
	 *
	 * @return string
	 */
	public function get_folder_name( $filename ) {
		return sanitize_title( $filename );
	}

	/**
	 * Get target path for the parent folder where all files are uploaded
	 *
	 * @return string
	 */
	public function get_target_path() {
		$upload_directory = wp_get_upload_dir();
		$upload_baseurl   = $upload_directory['basedir'];
		return trailingslashit( $upload_baseurl ) . $this->folder;
	}

	/**
	 * Get path
	 *
	 * @param $post_id
	 *
	 * @return string
	 */
	public function get_folder_path( $folder ) {
		return trailingslashit( $this->get_target_path() ) . $folder;
	}

	/**
	 * Check if there is an error
	 *
	 * @param $error
	 *
	 * @return bool|WP_Error
	 */
	public function check_error($error) {
		$file_errors = array(
			0 => __( "There is no error, the file uploaded with success", 'your_textdomain' ),
			1 => __( "The uploaded file exceeds the upload_max_files in server settings", 'your_textdomain' ),
			2 => __( "The uploaded file exceeds the MAX_FILE_SIZE from html form", 'your_textdomain' ),
			3 => __( "The uploaded file uploaded only partially", 'your_textdomain' ),
			4 => __( "No file was uploaded", 'your_textdomain' ),
			6 => __( "Missing a temporary folder", 'your_textdomain' ),
			7 => __( "Failed to write file to disk", 'your_textdomain' ),
			8 => __( "A PHP extension stoped file to upload", 'your_textdomain' ),
		);

		if ( $error > 0 ) {
			return new \WP_Error( 'file-error', $file_errors[ $error ] );
		}

		return true;
	}
}

uploader-2.php

<?php


class ZIP_Uploader {

	// ...
  
	/**
	 * Upload File
	 *
	 * @param $file
	 *
	 * @return bool|string|true|WP_Error
	 */
	public function upload( $file ) {
		/** @var $wp_filesystem \WP_Filesystem_Direct */
		global $wp_filesystem;
    
		if ( ! function_exists( 'WP_Filesystem' ) ) {
			include_once 'wp-admin/includes/file.php';
		}
    
		WP_Filesystem();

		$file_error = $file["file"]["error"];

		// Check for Errors
		if ( is_wp_error( $this->check_error( $file_error ) ) ) {
			return $this->check_error( $file_error );
		}
    
		$file_name       = $file["file"]["name"];
		$file_name_arr   = explode( '.', $file_name );
		$extension       = array_pop( $file_name_arr );
		$filename        = implode( '.', $file_name_arr ); // File Name
		$zip_file        = sanitize_title( $filename ) . '.' . $extension; //Our File

		if ( 'zip' !== $extension ) {
			return new WP_Error( 'no-zip', 'This does not seem to be a ZIP file' );
		}

		$temp_name  = $file["file"]["tmp_name"];
		$file_size  = $file["file"]["size"];

    // Get our destination folder
		$current_folder = $this->get_folder_path( $this->get_folder_name( $filename ) );

		// Get default folder that contains all zips. Create if does not exists.
		$default_target = $this->get_target_path();
    // Create our default folder if it does not exist
		if( ! file_exists( $default_target ) ){
			mkdir( $default_target );
		}

		// Get folder path
		$upload_path = $this->get_folder_path( $this->get_folder_name( $filename ) );
    // We will overwrite it all, so remove it.
		if ( $wp_filesystem->exists( $upload_path ) ) {
			$wp_filesystem->delete( $upload_path, true );
		}
    
    // Create it
		if ( ! $wp_filesystem->exists( $upload_path ) ) {
			$wp_filesystem->mkdir( $upload_path );
		}

		// Folder name where we will upload the ZIP
		$working_dir = $upload_path . '-zip';
    
    // Delete if such folder exists
		if ( $wp_filesystem->is_dir( $working_dir ) ) {
			$wp_filesystem->delete( $working_dir, true );
		}
    // Create the folder to hold our zip file
		$wp_filesystem->mkdir( $working_dir );
		
    // Uploading ZIP file
		if( move_uploaded_file( $temp_name, $working_dir . "/" . $zip_file ) ){

			// Unzip the file to the upload path
			$unzip_result = unzip_file( $working_dir . "/" . $zip_file, $upload_path );

			if ( is_wp_error( $unzip_result ) ) {
				return $unzip_result;
			} else {
				// No errors with unzips, let's delete everything and unzip it again.
				if ( $wp_filesystem->is_dir( $upload_path ) ) {
					$wp_filesystem->delete( $upload_path, true );
				}
				$wp_filesystem->mkdir( $upload_path );
				unzip_file( $working_dir . "/" . $zip_file, $upload_path );
			}

			// Remove the uploaded zip
			@unlink( $working_dir . "/" . $zip_file );
			if ( $wp_filesystem->is_dir( $working_dir ) ) {
				$wp_filesystem->delete( $working_dir, true );
			}

			return  $upload_path;
		} else {
			return new \WP_Error( 'not-uploaded', __( 'Could not upload file', 'your_textdomain' ) );
		}
	}


}

uploader.php

<?php


class ZIP_Uploader {

	protected $folder = '';

	public function __construct( $folder ) {
		$this->folder = $folder;
	}

	/**
	 * Get folder name where to upload
	 *
	 * @param $post_id
	 *
	 * @return string
	 */
	public function get_folder_name( $filename ) {
		return sanitize_title( $filename );
	}

	/**
	 * Get target path for the parent folder where all files are uploaded
	 *
	 * @return string
	 */
	public function get_target_path() {
		$upload_directory = wp_get_upload_dir();
		$upload_baseurl   = $upload_directory['basedir'];
		return trailingslashit( $upload_baseurl ) . $this->folder;
	}

	/**
	 * Get path
	 *
	 * @param $post_id
	 *
	 * @return string
	 */
	public function get_folder_path( $folder ) {
		return trailingslashit( $this->get_target_path() ) . $folder;
	}

	/**
	 * Check if there is an error
	 *
	 * @param $error
	 *
	 * @return bool|WP_Error
	 */
	public function check_error($error) {
		$file_errors = array(
			0 => __( "There is no error, the file uploaded with success", 'bam_courses_launcher' ),
			1 => __( "The uploaded file exceeds the upload_max_files in server settings", 'bam_courses_launcher' ),
			2 => __( "The uploaded file exceeds the MAX_FILE_SIZE from html form", 'bam_courses_launcher' ),
			3 => __( "The uploaded file uploaded only partially", 'bam_courses_launcher' ),
			4 => __( "No file was uploaded", 'bam_courses_launcher' ),
			6 => __( "Missing a temporary folder", 'bam_courses_launcher' ),
			7 => __( "Failed to write file to disk", 'bam_courses_launcher' ),
			8 => __( "A PHP extension stoped file to upload", 'bam_courses_launcher' ),
		);

		if ( $error > 0 ) {
			return new \WP_Error( 'file-error', $file_errors[ $error ] );
		}

		return true;
	}

	/**
	 * Upload File
	 *
	 * @param $file
	 *
	 * @return bool|string|true|WP_Error
	 */
	public function upload( $file ) {
		/** @var $wp_filesystem \WP_Filesystem_Direct */
		global $wp_filesystem;
		if ( ! function_exists( 'WP_Filesystem' ) ) {
			include_once 'wp-admin/includes/file.php';
		}
		WP_Filesystem();

		$file_error = $file["file"]["error"];

		// Check for Errors
		if ( is_wp_error( $this->check_error( $file_error ) ) ) {
			return $this->check_error( $file_error );
		}

		$file_name       = $file["file"]["name"];
		$file_name_arr   = explode( '.', $file_name );
		$extension       = array_pop( $file_name_arr );
		$filename        = implode( '.', $file_name_arr );
		$zip_file        = sanitize_title( $filename ) . '.' . $extension;

		if ( 'zip' !== $extension ) {
			return new WP_Error( 'no-zip', 'This does not seem to be a ZIP file' );
		}

		$temp_name  = $file["file"]["tmp_name"];
		$file_size  = $file["file"]["size"];

		$current_folder = $this->get_folder_path( $this->get_folder_name( $filename ) );

		// Get default folder that contains all courses. Create if does not exists.
		$default_target = $this->get_target_path();

		if( ! file_exists( $default_target ) ){
			mkdir( $default_target );
		}

		// Get course folder path, create if not exists
		$upload_path = $this->get_folder_path( $this->get_folder_name( $filename ) );

		if ( $wp_filesystem->exists( $upload_path ) ) {
			$wp_filesystem->delete( $upload_path, true );
		}

		if ( ! $wp_filesystem->exists( $upload_path ) ) {
			$wp_filesystem->mkdir( $upload_path );
		}

		// Getting a folder where we will upload the ZIP
		$working_dir = $upload_path . '-zip';

		if ( $wp_filesystem->is_dir( $working_dir ) ) {
			$wp_filesystem->delete( $working_dir, true );
		}

		$wp_filesystem->mkdir( $working_dir );
		// Uploading ZIP file
		if( move_uploaded_file( $temp_name, $working_dir . "/" . $zip_file ) ){

			// Unzip the file to the upload path
			$unzip_result = unzip_file( $working_dir . "/" . $zip_file, $upload_path );

			if ( is_wp_error( $unzip_result ) ) {
				return $unzip_result;
			} else {
				// No errors with unzips, let's delete everything and unzip it again.
				if ( $wp_filesystem->is_dir( $upload_path ) ) {
					$wp_filesystem->delete( $upload_path, true );
				}
				$wp_filesystem->mkdir( $upload_path );
				unzip_file( $working_dir . "/" . $zip_file, $upload_path );
			}

			// Remove the uploaded zip
			@unlink( $working_dir . "/" . $zip_file );
			if ( $wp_filesystem->is_dir( $working_dir ) ) {
				$wp_filesystem->delete( $working_dir, true );
			}

			return  $upload_path;
		} else {
			return new \WP_Error( 'not-uploaded', __( 'Could not upload file', 'your_textdomain' ) );
		}
	}


}