Introduce new HttpBodyHandler to easily extract full body of HttpRequest and HttpClientResponse.

tests/standalone/io/http_body_test.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.
+
+import 'dart:io';
+import 'dart:utf';
+
+import 'package:expect/expect.dart';
+
+void testHttpClientResponseBody() {
+  void test(String mimeType,
+            List<int> content,
+            dynamic expectedBody,
+            HttpBodyType type,
+            [bool shouldFail = false]) {
+    HttpServer.bind().then((server) {
+      server.listen((request) {
+        request.listen(
+            (_) {},
+            onDone: () {
+              request.response.headers.contentType =
+                  new ContentType.fromString(mimeType);
+              request.response.writeBytes(content);
+              request.response.close();
+            });
+      });
+
+      var client = new HttpClient();
+      client.get("127.0.0.1", server.port, "/")
+          .then((request) => request.close())
+          .then(HttpBodyHandler.processResponse)
+          .then((body) {
+            if (shouldFail) Expect.fail("Error expected");
+            Expect.equals(type, body.type);
+            switch (type) {
+              case HttpBodyType.TEXT:
+                Expect.equals(expectedBody, body.body);
+                break;
+
+              case HttpBodyType.JSON:
+                Expect.mapEquals(expectedBody, body.body);
+                break;
+
+              default:
+                Expect.fail("bad body type");
+            }
+          }, onError: (error) {
+            if (!shouldFail) Expect.fail("Error unexpected");
+          })
+          .whenComplete(() {
+            client.close();
+            server.close();
+          });
+    });
+  }
+  test("text/plain", "body".codeUnits, "body", HttpBodyType.TEXT);
+  test("text/plain; charset=utf-8",
+       "body".codeUnits,
+       "body",
+       HttpBodyType.TEXT);
+  test("text/plain; charset=iso-8859-1",
+       "body".codeUnits,
+       "body",
+       HttpBodyType.TEXT);
+  test("text/plain; charset=us-ascii",
+       "body".codeUnits,
+       "body",
+       HttpBodyType.TEXT);
+  test("text/plain; charset=utf-8", [42], "*", HttpBodyType.TEXT);
+  test("text/plain; charset=us-ascii", [142], "?", HttpBodyType.TEXT);
+  test("text/plain; charset=utf-8",
+       [142],
+       new String.fromCharCodes([UNICODE_REPLACEMENT_CHARACTER_CODEPOINT]),
+       HttpBodyType.TEXT);
+
+  test("application/json",
+       '{"val": 5}'.codeUnits,
+       { "val" : 5 },
+       HttpBodyType.JSON);
+  test("application/json",
+       '{ bad json }'.codeUnits,
+       null,
+       HttpBodyType.JSON,
+       true);
+}
+
+void testHttpServerRequestBody() {
+  void test(String mimeType,
+            List<int> content,
+            dynamic expectedBody,
+            int type,
+            [bool shouldFail = false]) {
+    HttpServer.bind().then((server) {
+      server.transform(new HttpBodyHandler())
+          .listen((body) {
+            if (shouldFail) Expect.fail("Error expected");
+            Expect.equals(type, body.type);
+            switch (type) {
+              case HttpBodyType.TEXT:
+                Expect.equals(expectedBody, body.body);
+                break;
+
+              case HttpBodyType.JSON:
+                Expect.mapEquals(expectedBody, body.body);
+                break;
+
+              default:
+                Expect.fail("bad body type");
+            }
+            body.response.close();
+          }, onError: (error) {
+            if (!shouldFail) Expect.fail("Error unexpected");
+          });
+
+      var client = new HttpClient();
+      client.post("127.0.0.1", server.port, "/")
+          .then((request) {
+            request.headers.contentType =
+                new ContentType.fromString(mimeType);
+            request.writeBytes(content);
+            return request.close();
+          })
+          .then((response) {
+            if (shouldFail) {
+              Expect.equals(HttpStatus.BAD_REQUEST, response.statusCode);
+            }
+            response.fold(null, (x, y) {});
+            client.close();
+            server.close();
+          });
+    });
+  }
+  test("text/plain", "body".codeUnits, "body", HttpBodyType.TEXT);
+  test("text/plain; charset=utf-8",
+       "body".codeUnits,
+       "body",
+       HttpBodyType.TEXT);
+  test("text/plain; charset=utf-8", [42], "*", HttpBodyType.TEXT);
+  test("text/plain; charset=us-ascii", [142], "?", HttpBodyType.TEXT);
+  test("text/plain; charset=utf-8",
+       [142],
+       new String.fromCharCodes([UNICODE_REPLACEMENT_CHARACTER_CODEPOINT]),
+       HttpBodyType.TEXT);
+
+  test("application/json",
+       '{"val": 5}'.codeUnits,
+       { "val" : 5 },
+       HttpBodyType.JSON);
+  test("application/json",
+       '{ bad json }'.codeUnits,
+       null,
+       HttpBodyType.JSON,
+       true);
+}
+
+
+void main() {
+  testHttpClientResponseBody();
+  testHttpServerRequestBody();
+}