http.dart

// Copyright (c) 2013, 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.

/// A [Future]-based library for making HTTP requests.
///
/// This library is based on Dart's `http` package, but we have removed the
/// dependency on mirrors and added a `mojo`-based HTTP client.
library http;

import 'dart:async';
import 'dart:convert';
import 'dart:typed_data';

import 'mojo_client.dart';
import 'response.dart';

/// Sends an HTTP HEAD request with the given headers to the given URL, which
/// can be a [Uri] or a [String].
///
/// This automatically initializes a new [Client] and closes that client once
/// the request is complete. If you're planning on making multiple requests to
/// the same server, you should use a single [Client] for all of those requests.
Future<Response> head(url) =>
  _withClient((client) => client.head(url));

/// Sends an HTTP GET request with the given headers to the given URL, which can
/// be a [Uri] or a [String].
///
/// This automatically initializes a new [Client] and closes that client once
/// the request is complete. If you're planning on making multiple requests to
/// the same server, you should use a single [Client] for all of those requests.
Future<Response> get(url, {Map<String, String> headers}) =>
  _withClient((client) => client.get(url, headers: headers));

/// Sends an HTTP POST request with the given headers and body to the given URL,
/// which can be a [Uri] or a [String].
///
/// [body] sets the body of the request.
Future<Response> post(url, {Map<String, String> headers, body}) =>
  _withClient((client) => client.post(url,
      headers: headers, body: body));

/// Sends an HTTP PUT request with the given headers and body to the given URL,
/// which can be a [Uri] or a [String].
///
/// [body] sets the body of the request. It can be a [String], a [List<int>] or
/// a [Map<String, String>]. If it's a String, it's encoded using [encoding] and
/// used as the body of the request. The content-type of the request will
/// default to "text/plain".
Future<Response> put(url, {Map<String, String> headers, body}) =>
  _withClient((client) => client.put(url,
      headers: headers, body: body));

/// Sends an HTTP PATCH request with the given headers and body to the given
/// URL, which can be a [Uri] or a [String].
///
/// [body] sets the body of the request. It can be a [String], a [List<int>] or
/// a [Map<String, String>]. If it's a String, it's encoded using [encoding] and
/// used as the body of the request. The content-type of the request will
/// default to "text/plain".
///
/// If [body] is a List, it's used as a list of bytes for the body of the
/// request.
///
/// If [body] is a Map, it's encoded as form fields using [encoding]. The
/// content-type of the request will be set to
/// `"application/x-www-form-urlencoded"`; this cannot be overridden.
///
/// [encoding] defaults to [UTF8].
///
/// For more fine-grained control over the request, use [Request] or
/// [StreamedRequest] instead.
Future<Response> patch(url, {Map<String, String> headers, body}) =>
  _withClient((client) => client.patch(url,
      headers: headers, body: body));

/// Sends an HTTP DELETE request with the given headers to the given URL, which
/// can be a [Uri] or a [String].
///
/// This automatically initializes a new [Client] and closes that client once
/// the request is complete. If you're planning on making multiple requests to
/// the same server, you should use a single [Client] for all of those requests.
///
/// For more fine-grained control over the request, use [Request] instead.
Future<Response> delete(url, {Map<String, String> headers}) =>
  _withClient((client) => client.delete(url, headers: headers));

/// Sends an HTTP GET request with the given headers to the given URL, which can
/// be a [Uri] or a [String], and returns a Future that completes to the body of
/// the response as a [String].
///
/// The Future will emit a [ClientException] if the response doesn't have a
/// success status code.
///
/// This automatically initializes a new [Client] and closes that client once
/// the request is complete. If you're planning on making multiple requests to
/// the same server, you should use a single [Client] for all of those requests.
///
/// For more fine-grained control over the request and response, use [Request]
/// instead.
Future<String> read(url, {Map<String, String> headers}) =>
  _withClient((client) => client.read(url, headers: headers));

/// Sends an HTTP GET request with the given headers to the given URL, which can
/// be a [Uri] or a [String], and returns a Future that completes to the body of
/// the response as a list of bytes.
///
/// The Future will emit a [ClientException] if the response doesn't have a
/// success status code.
///
/// This automatically initializes a new [Client] and closes that client once
/// the request is complete. If you're planning on making multiple requests to
/// the same server, you should use a single [Client] for all of those requests.
///
/// For more fine-grained control over the request and response, use [Request]
/// instead.
Future<Uint8List> readBytes(url, {Map<String, String> headers}) =>
  _withClient((client) => client.readBytes(url, headers: headers));

Future _withClient(Future fn(MojoClient client)) {
  var client = new MojoClient();
  var future = fn(client);
  return future.whenComplete(client.close);
}