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

mojo/public/dart/third_party/shelf/lib/src/message.dart

+// Copyright (c) 2014, 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.message;
+
+import 'dart:async';
+import 'dart:convert';
+
+import 'package:http_parser/http_parser.dart';
+
+import 'body.dart';
+import 'shelf_unmodifiable_map.dart';
+import 'util.dart';
+
+Body getBody(Message message) => message._body;
+
+/// Represents logic shared between [Request] and [Response].
+abstract class Message {
+  /// The HTTP headers.
+  ///
+  /// The value is immutable.
+  final Map<String, String> headers;
+
+  /// Extra context that can be used by for middleware and handlers.
+  ///
+  /// For requests, this is used to pass data to inner middleware and handlers;
+  /// for responses, it's used to pass data to outer middleware and handlers.
+  ///
+  /// Context properties that are used by a particular package should begin with
+  /// that package's name followed by a period. For example, if [logRequests]
+  /// wanted to take a prefix, its property name would be `"shelf.prefix"`,
+  /// since it's in the `shelf` package.
+  ///
+  /// The value is immutable.
+  final Map<String, Object> context;
+
+  /// The streaming body of the message.
+  ///
+  /// This can be read via [read] or [readAsString].
+  final Body _body;
+
+  /// Creates a new [Message].
+  ///
+  /// [body] is the response body. It may be either a [String], a
+  /// [Stream<List<int>>], or `null` to indicate no body. If it's a [String],
+  /// [encoding] is used to encode it to a [Stream<List<int>>]. It defaults to
+  /// UTF-8.
+  ///
+  /// If [headers] is `null`, it is treated as empty.
+  ///
+  /// If [encoding] is passed, the "encoding" field of the Content-Type header
+  /// in [headers] will be set appropriately. If there is no existing
+  /// Content-Type header, it will be set to "application/octet-stream".
+  Message(body, {Encoding encoding, Map<String, String> headers,
+      Map<String, Object> context})
+      : this._body = new Body(body, encoding),
+        this.headers = new ShelfUnmodifiableMap<String>(
+            _adjustHeaders(headers, encoding), ignoreKeyCase: true),
+        this.context = new ShelfUnmodifiableMap<Object>(context,
+            ignoreKeyCase: false);
+
+  /// The contents of the content-length field in [headers].
+  ///
+  /// If not set, `null`.
+  int get contentLength {
+    if (_contentLengthCache != null) return _contentLengthCache;
+    if (!headers.containsKey('content-length')) return null;
+    _contentLengthCache = int.parse(headers['content-length']);
+    return _contentLengthCache;
+  }
+  int _contentLengthCache;
+
+  /// The MIME type of the message.
+  ///
+  /// This is parsed from the Content-Type header in [headers]. It contains only
+  /// the MIME type, without any Content-Type parameters.
+  ///
+  /// If [headers] doesn't have a Content-Type header, this will be `null`.
+  String get mimeType {
+    var contentType = _contentType;
+    if (contentType == null) return null;
+    return contentType.mimeType;
+  }
+
+  /// The encoding of the message body.
+  ///
+  /// This is parsed from the "charset" parameter of the Content-Type header in
+  /// [headers].
+  ///
+  /// If [headers] doesn't have a Content-Type header or it specifies an
+  /// encoding that [dart:convert] doesn't support, this will be `null`.
+  Encoding get encoding {
+    var contentType = _contentType;
+    if (contentType == null) return null;
+    if (!contentType.parameters.containsKey('charset')) return null;
+    return Encoding.getByName(contentType.parameters['charset']);
+  }
+
+  /// The parsed version of the Content-Type header in [headers].
+  ///
+  /// This is cached for efficient access.
+  MediaType get _contentType {
+    if (_contentTypeCache != null) return _contentTypeCache;
+    if (!headers.containsKey('content-type')) return null;
+    _contentTypeCache = new MediaType.parse(headers['content-type']);
+    return _contentTypeCache;
+  }
+  MediaType _contentTypeCache;
+
+  /// Returns a [Stream] representing the body.
+  ///
+  /// Can only be called once.
+  Stream<List<int>> read() => _body.read();
+
+  /// Returns a [Future] containing the body as a String.
+  ///
+  /// If [encoding] is passed, that's used to decode the body.
+  /// Otherwise the encoding is taken from the Content-Type header. If that
+  /// doesn't exist or doesn't have a "charset" parameter, UTF-8 is used.
+  ///
+  /// This calls [read] internally, which can only be called once.
+  Future<String> readAsString([Encoding encoding]) {
+    if (encoding == null) encoding = this.encoding;
+    if (encoding == null) encoding = UTF8;
+    return encoding.decodeStream(read());
+  }
+
+  /// Creates a new [Message] by copying existing values and applying specified
+  /// changes.
+  Message change({Map<String, String> headers, Map<String, Object> context,
+      body});
+}
+
+/// Adds information about [encoding] to [headers].
+///
+/// Returns a new map without modifying [headers].
+Map<String, String> _adjustHeaders(
+    Map<String, String> headers, Encoding encoding) {
+  if (headers == null) headers = const {};
+  if (encoding == null) return headers;
+  if (headers['content-type'] == null) {
+    return addHeader(headers, 'content-type',
+        'application/octet-stream; charset=${encoding.name}');
+  }
+
+  var contentType = new MediaType.parse(headers['content-type']).change(
+      parameters: {'charset': encoding.name});
+  return addHeader(headers, 'content-type', contentType.toString());
+}