wp-admin/includes/ajax-actions.php:2568Handles uploading attachments via AJAX.
function wp_ajax_upload_attachment() { check_ajax_referer( 'media-form' ); /* * This function does not use wp_send_json_success() / wp_send_json_error() * as the html4 Plupload handler requires a text/html Content-Type for older IE. * See https://core.trac.wordpress.org/ticket/31037 */ if ( ! current_user_can( 'upload_files' ) ) { echo wp_json_encode( array( 'success' => false, 'data' => array( 'message' => __( 'Sorry, you are not allowed to upload files.' ), 'filename' => esc_html( $_FILES['async-upload']['name'] ), ), ) ); wp_die(); } if ( isset( $_REQUEST['post_id'] ) ) { $post_id = $_REQUEST['post_id']; if ( ! current_user_can( 'edit_post', $post_id ) ) { echo wp_json_encode( array( 'success' => false, 'data' => array( 'message' => __( 'Sorry, you are not allowed to attach files to this post.' ), 'filename' => esc_html( $_FILES['async-upload']['name'] ), ), ) ); wp_die(); } } else { $post_id = null; } $post_data = ! empty( $_REQUEST['post_data'] ) ? _wp_get_allowed_postdata( _wp_translate_postdata( false, (array) $_REQUEST['post_data'] ) ) : array(); if ( is_wp_error( $post_data ) ) { wp_die( $post_data->get_error_message() ); } // If the context is custom header or background, make sure the uploaded file is an image. if ( isset( $post_data['context'] ) && in_array( $post_data['context'], array( 'custom-header', 'custom-background' ), true ) ) { $wp_filetype = wp_check_filetype_and_ext( $_FILES['async-upload']['tmp_name'], $_FILES['async-upload']['name'] ); if ( ! wp_match_mime_types( 'image', $wp_filetype['type'] ) ) { echo wp_json_encode( array( 'success' => false, 'data' => array( 'message' => __( 'The uploaded file is not a valid image. Please try again.' ), 'filename' => esc_html( $_FILES['async-upload']['name'] ), ), ) ); wp_die(); } } $attachment_id = media_handle_upload( 'async-upload', $post_id, $post_data ); if ( is_wp_error( $attachment_id ) ) { echo wp_json_encode( array( 'success' => false, 'data' => array( 'message' => $attachment_id->get_error_message(), 'filename' => esc_html( $_FILES['async-upload']['name'] ), ), ) );Introduced in 3.3.0. Unchanged from 6.7.7 through 7.1.0.
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src/wp-admin/includes/ajax-actions.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.