| library shelf_static.staic_handler; |
| |
| import 'dart:io'; |
| |
| import 'package:http_parser/http_parser.dart'; |
| import 'package:mime/mime.dart' as mime; |
| import 'package:path/path.dart' as p; |
| import 'package:shelf/shelf.dart'; |
| |
| import 'util.dart'; |
| |
| // TODO option to exclude hidden files? |
| |
| /// Creates a Shelf [Handler] that serves files from the provided |
| /// [fileSystemPath]. |
| /// |
| /// Accessing a path containing symbolic links will succeed only if the resolved |
| /// path is within [fileSystemPath]. To allow access to paths outside of |
| /// [fileSystemPath], set [serveFilesOutsidePath] to `true`. |
| /// |
| /// When a existing directory is requested and a [defaultDocument] is specified |
| /// the directory is checked for a file with that name. If it exists, it is |
| /// served. |
| Handler createStaticHandler(String fileSystemPath, |
| {bool serveFilesOutsidePath: false, String defaultDocument}) { |
| var rootDir = new Directory(fileSystemPath); |
| if (!rootDir.existsSync()) { |
| throw new ArgumentError('A directory corresponding to fileSystemPath ' |
| '"$fileSystemPath" could not be found'); |
| } |
| |
| fileSystemPath = rootDir.resolveSymbolicLinksSync(); |
| |
| if (defaultDocument != null) { |
| if (defaultDocument != p.basename(defaultDocument)) { |
| throw new ArgumentError('defaultDocument must be a file name.'); |
| } |
| } |
| |
| return (Request request) { |
| var segs = [fileSystemPath]..addAll(request.url.pathSegments); |
| |
| var fsPath = p.joinAll(segs); |
| |
| var entityType = FileSystemEntity.typeSync(fsPath, followLinks: true); |
| |
| File file = null; |
| |
| if (entityType == FileSystemEntityType.FILE) { |
| file = new File(fsPath); |
| } else if (entityType == FileSystemEntityType.DIRECTORY) { |
| file = _tryDefaultFile(fsPath, defaultDocument); |
| } |
| |
| if (file == null) { |
| return new Response.notFound('Not Found'); |
| } |
| |
| if (!serveFilesOutsidePath) { |
| var resolvedPath = file.resolveSymbolicLinksSync(); |
| |
| // Do not serve a file outside of the original fileSystemPath |
| if (!p.isWithin(fileSystemPath, resolvedPath)) { |
| return new Response.notFound('Not Found'); |
| } |
| } |
| |
| if (entityType == FileSystemEntityType.DIRECTORY && |
| !request.url.path.endsWith('/')) { |
| // when serving the default document for a directory, if the requested |
| // path doesn't end with '/', redirect to the path with a trailing '/' |
| var uri = request.requestedUri; |
| assert(!uri.path.endsWith('/')); |
| var location = new Uri( |
| scheme: uri.scheme, |
| userInfo: uri.userInfo, |
| host: uri.host, |
| port: uri.port, |
| path: uri.path + '/', |
| query: uri.query); |
| |
| return new Response.movedPermanently(location.toString()); |
| } |
| |
| var fileStat = file.statSync(); |
| var ifModifiedSince = request.ifModifiedSince; |
| |
| if (ifModifiedSince != null) { |
| var fileChangeAtSecResolution = toSecondResolution(fileStat.changed); |
| if (!fileChangeAtSecResolution.isAfter(ifModifiedSince)) { |
| return new Response.notModified(); |
| } |
| } |
| |
| var headers = <String, String>{ |
| HttpHeaders.CONTENT_LENGTH: fileStat.size.toString(), |
| HttpHeaders.LAST_MODIFIED: formatHttpDate(fileStat.changed) |
| }; |
| |
| var contentType = mime.lookupMimeType(file.path); |
| if (contentType != null) { |
| headers[HttpHeaders.CONTENT_TYPE] = contentType; |
| } |
| |
| return new Response.ok(file.openRead(), headers: headers); |
| }; |
| } |
| |
| File _tryDefaultFile(String dirPath, String defaultFile) { |
| if (defaultFile == null) return null; |
| |
| var filePath = p.join(dirPath, defaultFile); |
| |
| var file = new File(filePath); |
| |
| if (file.existsSync()) { |
| return file; |
| } |
| |
| return null; |
| } |