Source
File: wp-admin/includes/file.php
function _wp_handle_upload( &$file, $overrides, $time, $action ) {
// The default error handler.
if ( ! function_exists( 'wp_handle_upload_error' ) ) {
function wp_handle_upload_error( &$file, $message ) {
return array( 'error' => $message );
}
}
/**
* Filters the data for a file before it is uploaded to WordPress.
*
* The dynamic portion of the hook name, `$action`, refers to the post action.
*
* @since 2.9.0 as 'wp_handle_upload_prefilter'.
* @since 4.0.0 Converted to a dynamic hook with `$action`.
*
* @param string[] $file An array of data for a single file.
*/
$file = apply_filters( "{$action}_prefilter", $file );
// You may define your own function and pass the name in $overrides['upload_error_handler'].
$upload_error_handler = 'wp_handle_upload_error';
if ( isset( $overrides['upload_error_handler'] ) ) {
$upload_error_handler = $overrides['upload_error_handler'];
}
// You may have had one or more 'wp_handle_upload_prefilter' functions error out the file. Handle that gracefully.
if ( isset( $file['error'] ) && ! is_numeric( $file['error'] ) && $file['error'] ) {
return call_user_func_array( $upload_error_handler, array( &$file, $file['error'] ) );
}
// Install user overrides. Did we mention that this voids your warranty?
// You may define your own function and pass the name in $overrides['unique_filename_callback'].
$unique_filename_callback = null;
if ( isset( $overrides['unique_filename_callback'] ) ) {
$unique_filename_callback = $overrides['unique_filename_callback'];
}
/*
* This may not have originally been intended to be overridable,
* but historically has been.
*/
if ( isset( $overrides['upload_error_strings'] ) ) {
$upload_error_strings = $overrides['upload_error_strings'];
} else {
// Courtesy of php.net, the strings that describe the error indicated in $_FILES[{form field}]['error'].
$upload_error_strings = array(
false,
sprintf(
/* translators: 1: upload_max_filesize, 2: php.ini */
__( 'The uploaded file exceeds the %1$s directive in %2$s.' ),
'upload_max_filesize',
'php.ini'
),
sprintf(
/* translators: %s: MAX_FILE_SIZE */
__( 'The uploaded file exceeds the %s directive that was specified in the HTML form.' ),
'MAX_FILE_SIZE'
),
__( 'The uploaded file was only partially uploaded.' ),
__( 'No file was uploaded.' ),
'',
__( 'Missing a temporary folder.' ),
__( 'Failed to write file to disk.' ),
__( 'File upload stopped by extension.' ),
);
}
// All tests are on by default. Most can be turned off by $overrides[{test_name}] = false;
$test_form = isset( $overrides['test_form'] ) ? $overrides['test_form'] : true;
$test_size = isset( $overrides['test_size'] ) ? $overrides['test_size'] : true;
// If you override this, you must provide $ext and $type!!
$test_type = isset( $overrides['test_type'] ) ? $overrides['test_type'] : true;
$mimes = isset( $overrides['mimes'] ) ? $overrides['mimes'] : false;
// A correct form post will pass this test.
if ( $test_form && ( ! isset( $_POST['action'] ) || ( $_POST['action'] != $action ) ) ) {
return call_user_func_array( $upload_error_handler, array( &$file, __( 'Invalid form submission.' ) ) );
}
// A successful upload will pass this test. It makes no sense to override this one.
if ( isset( $file['error'] ) && $file['error'] > 0 ) {
return call_user_func_array( $upload_error_handler, array( &$file, $upload_error_strings[ $file['error'] ] ) );
}
// A properly uploaded file will pass this test. There should be no reason to override this one.
$test_uploaded_file = 'wp_handle_upload' === $action ? is_uploaded_file( $file['tmp_name'] ) : @is_readable( $file['tmp_name'] );
if ( ! $test_uploaded_file ) {
return call_user_func_array( $upload_error_handler, array( &$file, __( 'Specified file failed upload test.' ) ) );
}
$test_file_size = 'wp_handle_upload' === $action ? $file['size'] : filesize( $file['tmp_name'] );
// A non-empty file will pass this test.
if ( $test_size && ! ( $test_file_size > 0 ) ) {
if ( is_multisite() ) {
$error_msg = __( 'File is empty. Please upload something more substantial.' );
} else {
$error_msg = sprintf(
/* translators: 1: php.ini, 2: post_max_size, 3: upload_max_filesize */
__( 'File is empty. Please upload something more substantial. This error could also be caused by uploads being disabled in your %1$s file or by %2$s being defined as smaller than %3$s in %1$s.' ),
'php.ini',
'post_max_size',
'upload_max_filesize'
);
}
return call_user_func_array( $upload_error_handler, array( &$file, $error_msg ) );
}
// A correct MIME type will pass this test. Override $mimes or use the upload_mimes filter.
if ( $test_type ) {
$wp_filetype = wp_check_filetype_and_ext( $file['tmp_name'], $file['name'], $mimes );
$ext = empty( $wp_filetype['ext'] ) ? '' : $wp_filetype['ext'];
$type = empty( $wp_filetype['type'] ) ? '' : $wp_filetype['type'];
$proper_filename = empty( $wp_filetype['proper_filename'] ) ? '' : $wp_filetype['proper_filename'];
// Check to see if wp_check_filetype_and_ext() determined the filename was incorrect.
if ( $proper_filename ) {
$file['name'] = $proper_filename;
}
if ( ( ! $type || ! $ext ) && ! current_user_can( 'unfiltered_upload' ) ) {
return call_user_func_array( $upload_error_handler, array( &$file, __( 'Sorry, this file type is not permitted for security reasons.' ) ) );
}
if ( ! $type ) {
$type = $file['type'];
}
} else {
$type = '';
}
/*
* A writable uploads dir will pass this test. Again, there's no point
* overriding this one.
*/
$uploads = wp_upload_dir( $time );
if ( ! ( $uploads && false === $uploads['error'] ) ) {
return call_user_func_array( $upload_error_handler, array( &$file, $uploads['error'] ) );
}
$filename = wp_unique_filename( $uploads['path'], $file['name'], $unique_filename_callback );
// Move the file to the uploads dir.
$new_file = $uploads['path'] . "/$filename";
/**
* Filters whether to short-circuit moving the uploaded file after passing all checks.
*
* If a non-null value is returned from the filter, moving the file and any related
* error reporting will be completely skipped.
*
* @since 4.9.0
*
* @param mixed $move_new_file If null (default) move the file after the upload.
* @param string[] $file An array of data for a single file.
* @param string $new_file Filename of the newly-uploaded file.
* @param string $type Mime type of the newly-uploaded file.
*/
$move_new_file = apply_filters( 'pre_move_uploaded_file', null, $file, $new_file, $type );
if ( null === $move_new_file ) {
if ( 'wp_handle_upload' === $action ) {
$move_new_file = @move_uploaded_file( $file['tmp_name'], $new_file );
} else {
// Use copy and unlink because rename breaks streams.
// phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged
$move_new_file = @copy( $file['tmp_name'], $new_file );
unlink( $file['tmp_name'] );
}
if ( false === $move_new_file ) {
if ( 0 === strpos( $uploads['basedir'], ABSPATH ) ) {
$error_path = str_replace( ABSPATH, '', $uploads['basedir'] ) . $uploads['subdir'];
} else {
$error_path = basename( $uploads['basedir'] ) . $uploads['subdir'];
}
return $upload_error_handler(
$file,
sprintf(
/* translators: %s: Destination file path. */
__( 'The uploaded file could not be moved to %s.' ),
$error_path
)
);
}
}
// Set correct file permissions.
$stat = stat( dirname( $new_file ) );
$perms = $stat['mode'] & 0000666;
chmod( $new_file, $perms );
// Compute the URL.
$url = $uploads['url'] . "/$filename";
if ( is_multisite() ) {
delete_transient( 'dirsize_cache' );
}
/**
* Filters the data array for the uploaded file.
*
* @since 2.1.0
*
* @param array $upload {
* Array of upload data.
*
* @type string $file Filename of the newly-uploaded file.
* @type string $url URL of the newly-uploaded file.
* @type string $type Mime type of the newly-uploaded file.
* }
* @param string $context The type of upload action. Values include 'upload' or 'sideload'.
*/
return apply_filters(
'wp_handle_upload',
array(
'file' => $new_file,
'url' => $url,
'type' => $type,
),
'wp_handle_sideload' === $action ? 'sideload' : 'upload'
);
}