Stop running pub get at gclient sync time and fix build bugs

mojo/public/dart/third_party/shelf_static/lib/src/static_handler.dart

+// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+library shelf_static.static_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 'directory_listing.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.
+///
+/// If no [defaultDocument] is found and [listDirectories] is true, then the
+/// handler produces a listing of the directory.
+Handler createStaticHandler(String fileSystemPath,
+    {bool serveFilesOutsidePath: false, String defaultDocument,
+    bool listDirectories: false}) {
+  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 && listDirectories) {
+        var uri = request.requestedUri;
+        if (!uri.path.endsWith('/')) return _redirectToAddTrailingSlash(uri);
+        return listDirectory(fileSystemPath, fsPath);
+      }
+    }
+
+    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');
+      }
+    }
+
+    // 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;
+    if (entityType == FileSystemEntityType.DIRECTORY &&
+        !uri.path.endsWith('/')) {
+      return _redirectToAddTrailingSlash(uri);
+    }
+
+    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);
+  };
+}
+
+Response _redirectToAddTrailingSlash(Uri uri) {
+  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());
+}
+
+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;
+}