lib/endpoints/class-wp-rest-attachments-controller.php
<?php
class WP_REST_Attachments_Controller extends WP_REST_Posts_Controller {
/**
* Determine the allowed query_vars for a get_items() response and
* prepare for WP_Query.
*
* @param array $prepared_args Optional. Array of prepared arguments.
* @param WP_REST_Request $request Optional. Request to prepare items for.
* @return array Array of query arguments.
*/
protected function prepare_items_query( $prepared_args = array(), $request = null ) {
$query_args = parent::prepare_items_query( $prepared_args, $request );
if ( empty( $query_args['post_status'] ) || ! in_array( $query_args['post_status'], array( 'inherit', 'private', 'trash' ), true ) ) {
$query_args['post_status'] = 'inherit';
}
$media_types = $this->get_media_types();
if ( ! empty( $request['media_type'] ) && isset( $media_types[ $request['media_type'] ] ) ) {
$query_args['post_mime_type'] = $media_types[ $request['media_type'] ];
}
if ( ! empty( $request['mime_type'] ) ) {
$parts = explode( '/', $request['mime_type'] );
if ( isset( $media_types[ $parts[0] ] ) && in_array( $request['mime_type'], $media_types[ $parts[0] ], true ) ) {
$query_args['post_mime_type'] = $request['mime_type'];
}
}
return $query_args;
}
/**
* Check if a given request has access to create an attachment.
*
* @param WP_REST_Request $request Full details about the request.
* @return WP_Error|true Boolean true if the attachment may be created, or a WP_Error if not.
*/
public function create_item_permissions_check( $request ) {
$ret = parent::create_item_permissions_check( $request );
if ( ! $ret || is_wp_error( $ret ) ) {
return $ret;
}
if ( ! current_user_can( 'upload_files' ) ) {
return new WP_Error( 'rest_cannot_create', __( 'Sorry, you are not allowed to upload media on this site.' ), array( 'status' => 400 ) );
}
// Attaching media to a post requires ability to edit said post.
if ( ! empty( $request['post'] ) ) {
$parent = $this->get_post( (int) $request['post'] );
$post_parent_type = get_post_type_object( $parent->post_type );
if ( ! current_user_can( $post_parent_type->cap->edit_post, $request['post'] ) ) {
return new WP_Error( 'rest_cannot_edit', __( 'Sorry, you are not allowed to upload media to this resource.' ), array( 'status' => rest_authorization_required_code() ) );
}
}
return true;
}
/**
* Create a single attachment.
*
* @param WP_REST_Request $request Full details about the request.
* @return WP_Error|WP_REST_Response Response object on success, WP_Error object on failure.
*/
public function create_item( $request ) {
if ( ! empty( $request['post'] ) && in_array( get_post_type( $request['post'] ), array( 'revision', 'attachment' ), true ) ) {
return new WP_Error( 'rest_invalid_param', __( 'Invalid parent type.' ), array( 'status' => 400 ) );
}
// Get the file via $_FILES or raw data
$files = $request->get_file_params();
$headers = $request->get_headers();
if ( ! empty( $files ) ) {
$file = $this->upload_from_file( $files, $headers );
} else {
$file = $this->upload_from_data( $request->get_body(), $headers );
}
if ( is_wp_error( $file ) ) {
return $file;
}
$name = basename( $file['file'] );
$name_parts = pathinfo( $name );
$name = trim( substr( $name, 0, -(1 + strlen( $name_parts['extension'] ) ) ) );
$url = $file['url'];
$type = $file['type'];
$file = $file['file'];
// use image exif/iptc data for title and caption defaults if possible
// @codingStandardsIgnoreStart
$image_meta = @wp_read_image_metadata( $file );
// @codingStandardsIgnoreEnd
if ( ! empty( $image_meta ) ) {
if ( empty( $request['title'] ) && trim( $image_meta['title'] ) && ! is_numeric( sanitize_title( $image_meta['title'] ) ) ) {
$request['title'] = $image_meta['title'];
}
if ( empty( $request['caption'] ) && trim( $image_meta['caption'] ) ) {
$request['caption'] = $image_meta['caption'];
}
}
$attachment = $this->prepare_item_for_database( $request );
$attachment->file = $file;
$attachment->post_mime_type = $type;
$attachment->guid = $url;
if ( empty( $attachment->post_title ) ) {
$attachment->post_title = preg_replace( '/\.[^.]+$/', '', basename( $file ) );
}
$id = wp_insert_post( $attachment, true );
if ( is_wp_error( $id ) ) {
if ( 'db_update_error' === $id->get_error_code() ) {
$id->add_data( array( 'status' => 500 ) );
} else {
$id->add_data( array( 'status' => 400 ) );
}
return $id;
}
$attachment = $this->get_post( $id );
// Include admin functions to get access to wp_generate_attachment_metadata().
require_once ABSPATH . 'wp-admin/includes/admin.php';
wp_update_attachment_metadata( $id, wp_generate_attachment_metadata( $id, $file ) );
if ( isset( $request['alt_text'] ) ) {
update_post_meta( $id, '_wp_attachment_image_alt', sanitize_text_field( $request['alt_text'] ) );
}
$fields_update = $this->update_additional_fields_for_object( $attachment, $request );
if ( is_wp_error( $fields_update ) ) {
return $fields_update;
}
$request->set_param( 'context', 'edit' );
$response = $this->prepare_item_for_response( $attachment, $request );
$response = rest_ensure_response( $response );
$response->set_status( 201 );
$response->header( 'Location', rest_url( sprintf( '%s/%s/%d', $this->namespace, $this->rest_base, $id ) ) );
/**
* Fires after a single attachment is created or updated via the REST API.
*
* @param object $attachment Inserted attachment.
* @param WP_REST_Request $request The request sent to the API.
* @param boolean $creating True when creating an attachment, false when updating.
*/
do_action( 'rest_insert_attachment', $attachment, $request, true );
return $response;
}
/**
* Update a single post.
*
* @param WP_REST_Request $request Full details about the request.
* @return WP_Error|WP_REST_Response Response object on success, WP_Error object on failure.
*/
public function update_item( $request ) {
if ( ! empty( $request['post'] ) && in_array( get_post_type( $request['post'] ), array( 'revision', 'attachment' ), true ) ) {
return new WP_Error( 'rest_invalid_param', __( 'Invalid parent type.' ), array( 'status' => 400 ) );
}
$response = parent::update_item( $request );
if ( is_wp_error( $response ) ) {
return $response;
}
$response = rest_ensure_response( $response );
$data = $response->get_data();
if ( isset( $request['alt_text'] ) ) {
update_post_meta( $data['id'], '_wp_attachment_image_alt', $request['alt_text'] );
}
$attachment = $this->get_post( $request['id'] );
$fields_update = $this->update_additional_fields_for_object( $attachment, $request );
if ( is_wp_error( $fields_update ) ) {
return $fields_update;
}
$request->set_param( 'context', 'edit' );
$response = $this->prepare_item_for_response( $attachment, $request );
$response = rest_ensure_response( $response );
/* This action is documented in lib/endpoints/class-wp-rest-attachments-controller.php */
do_action( 'rest_insert_attachment', $data, $request, false );
return $response;
}
/**
* Prepare a single attachment for create or update.
*
* @param WP_REST_Request $request Request object.
* @return WP_Error|stdClass $prepared_attachment Post object.
*/
protected function prepare_item_for_database( $request ) {
$prepared_attachment = parent::prepare_item_for_database( $request );
if ( isset( $request['caption'] ) ) {
$prepared_attachment->post_excerpt = $request['caption'];
}
if ( isset( $request['description'] ) ) {
$prepared_attachment->post_content = $request['description'];
}
if ( isset( $request['post'] ) ) {
$prepared_attachment->post_parent = (int) $request['post'];
}
return $prepared_attachment;
}
/**
* Prepare a single attachment output for response.
*
* @param WP_Post $post Post object.
* @param WP_REST_Request $request Request object.
* @return WP_REST_Response Response object.
*/
public function prepare_item_for_response( $post, $request ) {
$response = parent::prepare_item_for_response( $post, $request );
$data = $response->get_data();
$data['alt_text'] = get_post_meta( $post->ID, '_wp_attachment_image_alt', true );
$data['caption'] = $post->post_excerpt;
$data['description'] = $post->post_content;
$data['media_type'] = wp_attachment_is_image( $post->ID ) ? 'image' : 'file';
$data['mime_type'] = $post->post_mime_type;
$data['media_details'] = wp_get_attachment_metadata( $post->ID );
$data['post'] = ! empty( $post->post_parent ) ? (int) $post->post_parent : null;
$data['source_url'] = wp_get_attachment_url( $post->ID );
// Ensure empty details is an empty object.
if ( empty( $data['media_details'] ) ) {
$data['media_details'] = new stdClass;
} elseif ( ! empty( $data['media_details']['sizes'] ) ) {
foreach ( $data['media_details']['sizes'] as $size => &$size_data ) {
if ( isset( $size_data['mime-type'] ) ) {
$size_data['mime_type'] = $size_data['mime-type'];
unset( $size_data['mime-type'] );
}
// Use the same method image_downsize() does.
$image_src = wp_get_attachment_image_src( $post->ID, $size );
if ( ! $image_src ) {
continue;
}
$size_data['source_url'] = $image_src[0];
}
$full_src = wp_get_attachment_image_src( $post->ID, 'full' );
if ( ! empty( $full_src ) ) {
$data['media_details']['sizes']['full'] = array(
'file' => wp_basename( $full_src[0] ),
'width' => $full_src[1],
'height' => $full_src[2],
'mime_type' => $post->post_mime_type,
'source_url' => $full_src[0],
);
}
} else {
$data['media_details']['sizes'] = new stdClass;
}
$context = ! empty( $request['context'] ) ? $request['context'] : 'view';
$data = $this->filter_response_by_context( $data, $context );
// Wrap the data in a response object.
$response = rest_ensure_response( $data );
$response->add_links( $this->prepare_links( $post ) );
/**
* Filter an attachment returned from the API.
*
* Allows modification of the attachment right before it is returned.
*
* @param WP_REST_Response $response The response object.
* @param WP_Post $post The original attachment post.
* @param WP_REST_Request $request Request used to generate the response.
*/
return apply_filters( 'rest_prepare_attachment', $response, $post, $request );
}
/**
* Get the Attachment's schema, conforming to JSON Schema.
*
* @return array Item schema as an array.
*/
public function get_item_schema() {
$schema = parent::get_item_schema();
$schema['properties']['alt_text'] = array(
'description' => __( 'Alternative text to display when resource is not displayed.' ),
'type' => 'string',
'context' => array( 'view', 'edit', 'embed' ),
'arg_options' => array(
'sanitize_callback' => 'sanitize_text_field',
),
);
$schema['properties']['caption'] = array(
'description' => __( 'The caption for the resource.' ),
'type' => 'string',
'context' => array( 'view', 'edit' ),
'arg_options' => array(
'sanitize_callback' => 'wp_filter_post_kses',
),
);
$schema['properties']['description'] = array(
'description' => __( 'The description for the resource.' ),
'type' => 'string',
'context' => array( 'view', 'edit' ),
'arg_options' => array(
'sanitize_callback' => 'wp_filter_post_kses',
),
);
$schema['properties']['media_type'] = array(
'description' => __( 'Type of resource.' ),
'type' => 'string',
'enum' => array( 'image', 'file' ),
'context' => array( 'view', 'edit', 'embed' ),
'readonly' => true,
);
$schema['properties']['mime_type'] = array(
'description' => __( 'MIME type of resource.' ),
'type' => 'string',
'context' => array( 'view', 'edit', 'embed' ),
'readonly' => true,
);
$schema['properties']['media_details'] = array(
'description' => __( 'Details about the resource file, specific to its type.' ),
'type' => 'object',
'context' => array( 'view', 'edit', 'embed' ),
'readonly' => true,
);
$schema['properties']['post'] = array(
'description' => __( 'The id for the associated post of the resource.' ),
'type' => 'integer',
'context' => array( 'view', 'edit' ),
);
$schema['properties']['source_url'] = array(
'description' => __( 'URL to the original resource file.' ),
'type' => 'string',
'format' => 'uri',
'context' => array( 'view', 'edit', 'embed' ),
'readonly' => true,
);
return $schema;
}
/**
* Handle an upload via raw POST data.
*
* @param array $data Supplied file data.
* @param array $headers HTTP headers from the request.
* @return array|WP_Error Data from {@see wp_handle_sideload()}.
*/
protected function upload_from_data( $data, $headers ) {
if ( empty( $data ) ) {
return new WP_Error( 'rest_upload_no_data', __( 'No data supplied.' ), array( 'status' => 400 ) );
}
if ( empty( $headers['content_type'] ) ) {
return new WP_Error( 'rest_upload_no_content_type', __( 'No Content-Type supplied.' ), array( 'status' => 400 ) );
}
if ( empty( $headers['content_disposition'] ) ) {
return new WP_Error( 'rest_upload_no_content_disposition', __( 'No Content-Disposition supplied.' ), array( 'status' => 400 ) );
}
$filename = self::get_filename_from_disposition( $headers['content_disposition'] );
if ( empty( $filename ) ) {
return new WP_Error( 'rest_upload_invalid_disposition', __( 'Invalid Content-Disposition supplied. Content-Disposition needs to be formatted as `attachment; filename="image.png"` or similar.' ), array( 'status' => 400 ) );
}
if ( ! empty( $headers['content_md5'] ) ) {
$content_md5 = array_shift( $headers['content_md5'] );
$expected = trim( $content_md5 );
$actual = md5( $data );
if ( $expected !== $actual ) {
return new WP_Error( 'rest_upload_hash_mismatch', __( 'Content hash did not match expected.' ), array( 'status' => 412 ) );
}
}
// Get the content-type.
$type = array_shift( $headers['content_type'] );
/** Include admin functions to get access to wp_tempnam() and wp_handle_sideload() */
require_once ABSPATH . 'wp-admin/includes/admin.php';
// Save the file.
$tmpfname = wp_tempnam( $filename );
$fp = fopen( $tmpfname, 'w+' );
if ( ! $fp ) {
return new WP_Error( 'rest_upload_file_error', __( 'Could not open file handle.' ), array( 'status' => 500 ) );
}
fwrite( $fp, $data );
fclose( $fp );
// Now, sideload it in.
$file_data = array(
'error' => null,
'tmp_name' => $tmpfname,
'name' => $filename,
'type' => $type,
);
$overrides = array(
'test_form' => false,
);
$sideloaded = wp_handle_sideload( $file_data, $overrides );
if ( isset( $sideloaded['error'] ) ) {
// @codingStandardsIgnoreStart
@unlink( $tmpfname );
// @codingStandardsIgnoreEnd
return new WP_Error( 'rest_upload_sideload_error', $sideloaded['error'], array( 'status' => 500 ) );
}
return $sideloaded;
}
/**
* Parse filename from a Content-Disposition header value.
*
* As per RFC6266:
*
* content-disposition = "Content-Disposition" ":"
* disposition-type *( ";" disposition-parm )
*
* disposition-type = "inline" | "attachment" | disp-ext-type
* ; case-insensitive
* disp-ext-type = token
*
* disposition-parm = filename-parm | disp-ext-parm
*
* filename-parm = "filename" "=" value
* | "filename*" "=" ext-value
*
* disp-ext-parm = token "=" value
* | ext-token "=" ext-value
* ext-token = <the characters in token, followed by "*">
*
* @see http://tools.ietf.org/html/rfc2388
* @see http://tools.ietf.org/html/rfc6266
*
* @param string[] $disposition_header List of Content-Disposition header values.
* @return string|null Filename if available, or null if not found.
*/
public static function get_filename_from_disposition( $disposition_header ) {
// Get the filename.
$filename = null;
foreach ( $disposition_header as $value ) {
$value = trim( $value );
if ( strpos( $value, ';' ) === false ) {
continue;
}
list( $type, $attr_parts ) = explode( ';', $value, 2 );
$attr_parts = explode( ';', $attr_parts );
$attributes = array();
foreach ( $attr_parts as $part ) {
if ( strpos( $part, '=' ) === false ) {
continue;
}
list( $key, $value ) = explode( '=', $part, 2 );
$attributes[ trim( $key ) ] = trim( $value );
}
if ( empty( $attributes['filename'] ) ) {
continue;
}
$filename = trim( $attributes['filename'] );
// Unquote quoted filename, but after trimming.
if ( substr( $filename, 0, 1 ) === '"' && substr( $filename, -1, 1 ) === '"' ) {
$filename = substr( $filename, 1, -1 );
}
}
return $filename;
}
/**
* Get the query params for collections of attachments.
*
* @return array Query parameters for the attachment collection as an array.
*/
public function get_collection_params() {
$params = parent::get_collection_params();
$params['status']['default'] = 'inherit';
$params['status']['enum'] = array( 'inherit', 'private', 'trash' );
$media_types = $this->get_media_types();
$params['media_type'] = array(
'default' => null,
'description' => __( 'Limit result set to attachments of a particular media type.' ),
'type' => 'string',
'enum' => array_keys( $media_types ),
'validate_callback' => 'rest_validate_request_arg',
);
$params['mime_type'] = array(
'default' => null,
'description' => __( 'Limit result set to attachments of a particular MIME type.' ),
'type' => 'string',
);
return $params;
}
/**
* Validate whether the user can query private statuses
*
* @param mixed $value Status value.
* @param WP_REST_Request $request Request object.
* @param string $parameter Additional parameter to pass to validation.
* @return WP_Error|boolean Boolean true if the user may query, WP_Error if not.
*/
public function validate_user_can_query_private_statuses( $value, $request, $parameter ) {
if ( 'inherit' === $value ) {
return true;
}
return parent::validate_user_can_query_private_statuses( $value, $request, $parameter );
}
/**
* Handle an upload via multipart/form-data ($_FILES).
*
* @param array $files Data from $_FILES.
* @param array $headers HTTP headers from the request.
* @return array|WP_Error Data from {@see wp_handle_upload()}.
*/
protected function upload_from_file( $files, $headers ) {
if ( empty( $files ) ) {
return new WP_Error( 'rest_upload_no_data', __( 'No data supplied.' ), array( 'status' => 400 ) );
}
// Verify hash, if given.
if ( ! empty( $headers['content_md5'] ) ) {
$content_md5 = array_shift( $headers['content_md5'] );
$expected = trim( $content_md5 );
$actual = md5_file( $files['file']['tmp_name'] );
if ( $expected !== $actual ) {
return new WP_Error( 'rest_upload_hash_mismatch', __( 'Content hash did not match expected.' ), array( 'status' => 412 ) );
}
}
// Pass off to WP to handle the actual upload.
$overrides = array(
'test_form' => false,
);
// Bypasses is_uploaded_file() when running unit tests.
if ( defined( 'DIR_TESTDATA' ) && DIR_TESTDATA ) {
$overrides['action'] = 'wp_handle_mock_upload';
}
// Include admin functions to get access to wp_handle_upload().
require_once ABSPATH . 'wp-admin/includes/admin.php';
$file = wp_handle_upload( $files['file'], $overrides );
if ( isset( $file['error'] ) ) {
return new WP_Error( 'rest_upload_unknown_error', $file['error'], array( 'status' => 500 ) );
}
return $file;
}
/**
* Get the supported media types.
*
* Media types are considered the MIME type category.
*
* @return array
*/
protected function get_media_types() {
$media_types = array();
foreach ( get_allowed_mime_types() as $mime_type ) {
$parts = explode( '/', $mime_type );
if ( ! isset( $media_types[ $parts[0] ] ) ) {
$media_types[ $parts[0] ] = array();
}
$media_types[ $parts[0] ][] = $mime_type;
}
return $media_types;
}
}