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<?php
namespace W3TC;
/**
* Google drive engine
*/
class CdnEngine_GoogleDrive extends CdnEngine_Base {
private $_client_id;
private $_refresh_token;
private $_root_folder_id;
private $_root_url;
private $_service;
private $_tablename_pathmap;
/**
* PHP5 Constructor
*
* @param array $config
*/
function __construct( $config = array() ) {
parent::__construct( $config );
$this->_client_id = $config['client_id'];
$this->_refresh_token = $config['refresh_token'];
$this->_root_folder_id = $config['root_folder_id'];
$this->_root_url = rtrim( $config['root_url'], '/' ) . '/';
$this->_new_access_token_callback = $config['new_access_token_callback'];
global $wpdb;
$this->_tablename_pathmap = $wpdb->base_prefix . W3TC_CDN_TABLE_PATHMAP;
try {
$this->_init_service( $config['access_token'] );
} catch ( \Exception $e ) {
$this->_service = null;
}
}
private function _init_service( $access_token ) {
if ( empty( $this->_client_id ) || empty( $access_token ) )
throw new \Exception('service not configured');
$client = new \W3TCG_Google_Client();
$client->setClientId( $this->_client_id );
$client->setAccessToken( $access_token );
$this->_service = new \W3TCG_Google_Service_Drive( $client );
}
private function _refresh_token() {
$result = wp_remote_post( W3TC_GOOGLE_DRIVE_AUTHORIZE_URL, array(
'body' => array(
'client_id' => $this->_client_id,
'refresh_token' => $this->_refresh_token
) ) );
if ( is_wp_error( $result ) )
throw new \Exception( $result );
elseif ( $result['response']['code'] != '200' )
throw new \Exception( $result['body'] );
$access_token = $result['body'];
call_user_func( $this->_new_access_token_callback, $access_token );
$this->_init_service( $access_token );
}
/**
* Uploads files
*
* @param array $files
* @param array $results
* @param boolean $force_rewrite
* @return boolean
*/
function upload( $files, &$results, $force_rewrite = false, $timeout_time = NULL ) {
if ( is_null( $this->_service ) )
return false;
$allow_refresh_token = true;
$result = true;
$files_chunks = array_chunk( $files , 20 );
foreach ( $files_chunks as $files_chunk ) {
$r = $this->_upload_chunk( $files_chunk, $results,
$force_rewrite, $timeout_time, $allow_refresh_token );
if ( $r == 'refresh_required' ) {
$allow_refresh_token = false;
$this->_refresh_token();
$r = $this->_upload_chunk( $files_chunk, $results,
$force_rewrite, $timeout_time, $allow_refresh_token );
}
if ( $r != 'success' )
$result = false;
if ( $r == 'timeout' ) {
return 'timeout';
}
}
return $result;
}
private function _properties_to_path( $file ) {
$path_pieces = array();
foreach ( $file->properties as $p ) {
$k = ($p->key == 'path') ? 'path1' : $p->key;
if ( !preg_match( '/^path[0-9]+$/', $k ) )
continue;
$path_pieces[$k] = $p->value;
}
if ( count( $path_pieces ) == 0 )
return NULL;
ksort($path_pieces);
return join( $path_pieces );
}
private function _path_to_properties( $path ) {
// from google drive api docs:
// Maximum of 124 bytes size per property
// (including both key and value) string in UTF-8 encoding.
// Maximum of 30 private properties per file from any one application.
$chunks = str_split( $path, 55 );
$properties = array();
$i = 1;
foreach ( $chunks as $chunk ) {
$p = new \W3TCG_Google_Service_Drive_Property();
$p->key = 'path' . $i;
$p->value = $chunk;
$properties[] = $p;
$i++;
}
return $properties;
}
private function _upload_chunk( $files, &$results, $force_rewrite,
$timeout_time, $allow_refresh_token ) {
list( $result, $listed_files ) = $this->list_files_chunk( $files,
$allow_refresh_token, $timeout_time );
if ( $result != 'success' )
return $result;
$files_by_path = array();
foreach ( $listed_files as $existing_file ) {
$path = $this->_properties_to_path( $existing_file );
if ( $path ) {
$files_by_path[$path] = $existing_file;
}
}
// check update date and upload
foreach ( $files as $file_descriptor ) {
$remote_path = $file_descriptor['remote_path'];
// process at least one item before timeout so that progress goes on
if ( !empty( $results ) ) {
if ( !is_null( $timeout_time ) && time() > $timeout_time )
return 'timeout';
}
list( $parent_id, $title ) = $this->remote_path_to_title(
$file_descriptor['remote_path'] );
$properties = $this->_path_to_properties( $remote_path );
if ( isset( $file_descriptor['content'] ) ) {
// when content specified - just upload
$content = $file_descriptor['content'];
} else {
$local_path = $file_descriptor['local_path'];
if ( !file_exists( $local_path ) ) {
$results[] = $this->_get_result( $local_path,
$remote_path,
W3TC_CDN_RESULT_ERROR, 'Source file not found.',
$file_descriptor );
continue;
}
$mtime = @filemtime( $local_path );
$p = new \W3TCG_Google_Service_Drive_Property();
$p->key = 'mtime';
$p->value = $mtime;
$properties[] = $p;
if ( !$force_rewrite && isset( $files_by_path[$remote_path] ) ) {
$existing_file = $files_by_path[$remote_path];
$existing_size = $existing_file->fileSize;
$existing_mtime = 0;
if ( is_array( $existing_file->properties ) ) {
foreach ( $existing_file->properties as $p ) {
if ( $p->key == 'mtime' )
$existing_mtime = $p->value;
}
}
$size = @filesize( $local_path );
if ( $mtime == $existing_mtime && $size == $existing_size ) {
$results[] = $this->_get_result( $file_descriptor['local_path'],
$remote_path, W3TC_CDN_RESULT_OK,
'File up-to-date.', $file_descriptor );
continue;
}
}
$content = file_get_contents( $local_path );
}
$file = new \W3TCG_Google_Service_Drive_DriveFile();
$file->setTitle( $title );
$file->setProperties( $properties );
$parent = new \W3TCG_Google_Service_Drive_ParentReference();
$parent->setId( $parent_id );
$file->setParents( array( $parent ) );
try {
try {
// update file if there's one already or insert
if ( isset( $files_by_path[$remote_path] ) ) {
$existing_file = $files_by_path[$remote_path];
$created_file = $this->_service->files->update(
$existing_file->id, $file, array(
'data' => $content,
'uploadType' => 'media'
) );
} else {
$created_file = $this->_service->files->insert( $file, array(
'data' => $content,
'uploadType' => 'media'
) );
$permission = new \W3TCG_Google_Service_Drive_Permission();
$permission->setValue( '' );
$permission->setType( 'anyone' );
$permission->setRole( 'reader' );
$this->_service->permissions->insert( $created_file->id,
$permission );
}
} catch ( \W3TCG_Google_Auth_Exception $e ) {
if ( $allow_refresh_token )
return 'refresh_required';
throw $e;
}
$results[] = $this->_get_result( $file_descriptor['local_path'],
$remote_path, W3TC_CDN_RESULT_OK,
'OK', $file_descriptor );
$this->path_set_id( $remote_path, $created_file->id );
} catch ( \W3TCG_Google_Service_Exception $e ) {
$errors = $e->getErrors();
$details = '';
if ( count( $errors ) >= 1 ) {
$details = json_encode($errors);
}
delete_transient( 'w3tc_cdn_google_drive_folder_ids' );
$results[] = $this->_get_result( $file_descriptor['local_path'],
$remote_path, W3TC_CDN_RESULT_ERROR,
'Failed to upload file ' . $remote_path .
' ' . $details, $file_descriptor );
$result = 'with_errors';
continue;
} catch ( \Exception $e ) {
delete_transient( 'w3tc_cdn_google_drive_folder_ids' );
$results[] = $this->_get_result( $file_descriptor['local_path'],
$remote_path, W3TC_CDN_RESULT_ERROR,
'Failed to upload file ' . $remote_path,
$file_descriptor );
$result = 'with_errors';
continue;
}
}
return $result;
}
/**
* Deletes files
*
* @param array $files
* @param array $results
* @return boolean
*/
function delete( $files, &$results ) {
$allow_refresh_token = true;
$result = true;
$files_chunks = array_chunk( $files , 20 );
foreach ( $files_chunks as $files_chunk ) {
$r = $this->_delete_chunk( $files_chunk, $results,
$allow_refresh_token );
if ( $r == 'refresh_required' ) {
$allow_refresh_token = false;
$this->_refresh_token();
$r = $this->_delete_chunk( $files_chunk, $results,
$allow_refresh_token );
}
if ( $r != 'success' )
$result = false;
}
return $result;
}
private function _delete_chunk( $files, &$results, $allow_refresh_token ) {
list( $result, $listed_files ) = $this->list_files_chunk( $files,
$allow_refresh_token );
if ( $result != 'success' )
return $result;
foreach ( $listed_files->items as $item ) {
try {
$this->_service->files->delete( $item->id );
$results[] = $this->_get_result( $item->title,
$item->title, W3TC_CDN_RESULT_OK,
'OK' );
} catch ( \Exception $e ) {
$results[] = $this->_get_result( '',
'', W3TC_CDN_RESULT_ERROR,
'Failed to delete file ' . $item->title );
$result = 'with_errors';
continue;
}
}
return $result;
}
private function list_files_chunk( $files, $allow_refresh_token,
$timeout_time = NULL ) {
$titles_filter = array();
try {
foreach ( $files as $file_descriptor ) {
list( $parent_id, $title ) = $this->remote_path_to_title(
$file_descriptor['remote_path'] );
$titles_filter[] = '("' . $parent_id .
'" in parents and title = "' . $title . '")';
if ( !is_null( $timeout_time ) && time() > $timeout_time )
return array( 'timeout', array() );
}
} catch ( \W3TCG_Google_Auth_Exception $e ) {
if ( $allow_refresh_token )
return array( 'refresh_required', array() );
throw $e;
} catch ( \Exception $e ) {
return array( 'with_errors', array() );
}
// find files
try {
try {
$listed_files = $this->_service->files->listFiles(
array( 'q' => '(' . join( ' or ', $titles_filter ) . ') and trashed = false' )
);
} catch ( \W3TCG_Google_Auth_Exception $e ) {
if ( $allow_refresh_token )
return array( 'refresh_required', array() );
throw $e;
}
} catch ( \Exception $e ) {
return array( 'with_errors', array() );
}
return array( 'success', $listed_files );
}
private function remote_path_to_title( $remote_path ) {
$title = substr( $remote_path, 1 );
$pos = strrpos( $remote_path, '/' );
if ( $pos === false ) {
$path = '';
$title = $remote_path;
} else {
$path = substr( $remote_path, 0, $pos );
$title = substr( $remote_path, $pos + 1 );
}
$title = str_replace( '"', "'", $title );
$parent_id = $this->path_to_parent_id( $this->_root_folder_id, $path );
return array( $parent_id, $title );
}
private function path_to_parent_id( $root_id, $path ) {
if ( empty( $path ) )
return $root_id;
$path = ltrim( $path, '/' );
$pos = strpos( $path, '/' );
if ( $pos === false ) {
$top_folder = $path;
$remaining_path = '';
} else {
$top_folder = substr( $path, 0, $pos );
$remaining_path = substr( $path, $pos + 1 );
}
$new_root_id = $this->parent_id_resolve_step( $root_id, $top_folder );
return $this->path_to_parent_id( $new_root_id, $remaining_path );
}
private function parent_id_resolve_step( $root_id, $folder ) {
// decode top folder
$ids_string = get_transient( 'w3tc_cdn_google_drive_folder_ids' );
$ids = @unserialize( $ids_string );
if ( isset( $ids[$root_id . '_' . $folder] ) )
return $ids[$root_id . '_' . $folder];
// find folder
$items = $this->_service->files->listFiles( array(
'q' => '"' . $root_id . '" in parents '.
'and title = "' . $folder . '" ' .
'and mimeType = "application/vnd.google-apps.folder" ' .
'and trashed = false'
) );
if ( count( $items ) > 0 ) {
$id = $items[0]->id;
} else {
// create folder
$file = new \W3TCG_Google_Service_Drive_DriveFile( array(
'title' => $folder,
'mimeType' => 'application/vnd.google-apps.folder' ) );
$parent = new \W3TCG_Google_Service_Drive_ParentReference();
$parent->setId( $root_id );
$file->setParents( array( $parent ) );
$created_file = $this->_service->files->insert( $file );
$id = $created_file->id;
$permission = new \W3TCG_Google_Service_Drive_Permission();
$permission->setValue( '' );
$permission->setType( 'anyone' );
$permission->setRole( 'reader' );
$this->_service->permissions->insert( $id, $permission );
}
if ( !is_array( $ids ) )
$ids = array();
$ids[$root_id . '_' . $folder] = $id;
set_transient( 'w3tc_cdn_google_drive_folder_ids', serialize( $ids ) );
return $id;
}
/**
* Tests
*
* @param string $error
* @return boolean
*/
function test( &$error ) {
$test_content = '' . rand();
$file = array(
'local_path' => 'n/a',
'remote_path' => '/folder/test.txt',
'content' => $test_content
);
$results = array();
if ( !$this->upload( array( $file ), $results ) ) {
$error = sprintf( 'Unable to upload file %s', $file['remote_path'] );
return false;
}
if ( !$this->delete( array( $file ), $results ) ) {
$error = sprintf( 'Unable to delete file %s', $file['remote_path'] );
return false;
}
return true;
}
/**
* Returns array of CDN domains
*
* @return array
*/
function get_domains() {
return array();
}
/**
* How and if headers should be set
*
* @return string W3TC_CDN_HEADER_NONE, W3TC_CDN_HEADER_UPLOADABLE, W3TC_CDN_HEADER_MIRRORING
*/
function headers_support() {
return W3TC_CDN_HEADER_NONE;
}
function purge_all( &$results ) {
return false;
}
private function path_set_id( $path, $id ) {
global $wpdb;
$md5 = md5( $path );
if ( !$id ) {
$sql = "
INSERT INTO $this->_tablename_pathmap (path, path_hash, remote_id)
VALUES (%s, %s, NULL)
ON DUPLICATE KEY UPDATE remote_id = NULL";
$wpdb->query($wpdb->prepare($sql, $path, $md5));
} else {
$sql = "
INSERT INTO $this->_tablename_pathmap (path, path_hash, remote_id)
VALUES (%s, %s, %s)
ON DUPLICATE KEY UPDATE remote_id = %s";
$wpdb->query($wpdb->prepare(
$sql, $path, $md5, $id, $id));
}
}
private function path_get_id( $path, $allow_refresh_token = true ) {
global $wpdb;
$md5 = md5($path);
$sql = "SELECT remote_id FROM $this->_tablename_pathmap WHERE path_hash = %s";
$query = $wpdb->prepare( $sql, $md5 );
$results = $wpdb->get_results( $query );
if ( count( $results ) > 0 ) {
return $results[0]->remote_id;
}
$props = $this->_path_to_properties( $path );
$q = 'trashed = false';
foreach ( $props as $prop ) {
$key = $prop->key;
$value = str_replace( "'", "\\'", $prop->value );
$q .= " and properties has { key='$key' and " .
" value='$value' and visibility='PRIVATE' }";
}
try {
$items = $this->_service->files->listFiles(
array( 'q' => $q ) );
} catch ( \W3TCG_Google_Auth_Exception $e ) {
if ( $allow_refresh_token ) {
$this->_refresh_token();
return $this->path_get_id( $path, false );
}
throw $e;
}
$id = ( count( $items ) == 0 ) ? NULL : $items[0]->id;
$this->path_set_id( $path, $id );
return $id;
}
function format_url( $path, $allow_refresh_token = true ) {
$id = $this->path_get_id( Util_Environment::remove_query( $path ) );
if ( is_null( $id ) )
return NULL;
return 'https://drive.google.com/uc?id=' . $id;
}
}