Add a multipart HTTP request class.

pkg/http/test/multipart_test.dart

Index: pkg/http/test/multipart_test.dart
diff --git a/pkg/http/test/multipart_test.dart b/pkg/http/test/multipart_test.dart
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+// Copyright (c) 2012, 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 multipart_test;
+
+import 'dart:io';
+import 'dart:utf';
+
+// TODO(nweiz): get rid of this import before packaging this
+import '../../../tests/utils/test_utils.dart';
+// TODO(nweiz): make these package: imports
+import '../../unittest/lib/unittest.dart';
+import '../lib/http.dart' as http;
+import '../lib/src/utils.dart';
+
+import 'utils.dart';
+
+/// A matcher that validates the body of a multipart request after finalization.
+/// The string "{{boundary}}" in [pattern] will be replaced by the boundary
+/// string for the request, and LF newlines will be replaced with CRLF.
+/// Indentation will be normalized.
+Matcher bodyMatches(String pattern) => new _BodyMatches(pattern);
+
+class _BodyMatches extends BaseMatcher {
+  final String _pattern;
+
+  _BodyMatches(this._pattern);
+
+  bool matches(item, MatchState matchState) {
+    if (item is! http.MultipartRequest) return false;
+
+    var future = consumeInputStream(item.finalize()).transform((bodyBytes) {
+      var body = decodeUtf8(bodyBytes);
+      var contentType = new ContentType.fromString(
+          item.headers['content-type']);
+      var boundary = contentType.parameters['boundary'];
+      var expected = cleanUpLiteral(_pattern)
+          .replaceAll("\n", "\r\n")
+          .replaceAll("{{boundary}}", boundary);
+
+      expect(body, equals(expected));
+      expect(item.contentLength, equals(bodyBytes.length));
+    });
+
+    return completes.matches(future, matchState);
+  }
+
+  Description describe(Description description) {
+    return description.add('has a body that matches "$_pattern"');
+  }
+}
+
+void main() {
+  test('empty', () {
+    var request = new http.MultipartRequest('POST', dummyUrl);
+    expect(request, bodyMatches('''
+        --{{boundary}}--
+        '''));
+  });
+
+  test('with fields and files', () {
+    var request = new http.MultipartRequest('POST', dummyUrl);
+    request.fields['field1'] = 'value1';
+    request.fields['field2'] = 'value2';
+    request.files.add(new http.MultipartFile.fromString("file1", "contents1",
+        filename: "filename1.txt"));
+    request.files.add(new http.MultipartFile.fromString("file2", "contents2"));
+
+    expect(request, bodyMatches('''
+        --{{boundary}}
+        content-disposition: form-data; name="field1"
+
+        value1
+        --{{boundary}}
+        content-disposition: form-data; name="field2"
+
+        value2
+        --{{boundary}}
+        content-type: text/plain; charset=UTF-8
+        content-disposition: form-data; name="file1"; filename="filename1.txt"
+
+        contents1
+        --{{boundary}}
+        content-type: text/plain; charset=UTF-8
+        content-disposition: form-data; name="file2"
+
+        contents2
+        --{{boundary}}--
+        '''));
+  });
+
+  test('with a unicode field name', () {
+    var request = new http.MultipartRequest('POST', dummyUrl);
+    request.fields['fïēld'] = 'value';
+
+    expect(request, bodyMatches('''
+        --{{boundary}}
+        content-disposition: form-data; name="f%C3%AF%C4%93ld"
+
+        value
+        --{{boundary}}--
+        '''));
+  });
+
+  test('with a unicode field value', () {
+    var request = new http.MultipartRequest('POST', dummyUrl);
+    request.fields['field'] = 'vⱥlūe';
+
+    expect(request, bodyMatches('''
+        --{{boundary}}
+        content-disposition: form-data; name="field"
+        content-type: text/plain; charset=UTF-8
+
+        vⱥlūe
+        --{{boundary}}--
+        '''));
+  });
+
+  test('with a unicode filename', () {
+    var request = new http.MultipartRequest('POST', dummyUrl);
+    request.files.add(new http.MultipartFile.fromString('file', 'contents',
+        filename: 'fïlēname.txt'));
+
+    expect(request, bodyMatches('''
+        --{{boundary}}
+        content-type: text/plain; charset=UTF-8
+        content-disposition: form-data; name="file"; filename="f%C3%AFl%C4%93name.txt"
+
+        contents
+        --{{boundary}}--
+        '''));
+  });
+
+  test('with a string file with a content-type but no charset', () {
+    var request = new http.MultipartRequest('POST', dummyUrl);
+    var file = new http.MultipartFile.fromString('file', '{"hello": "world"}',
+        contentType: new ContentType('application', 'json'));
+    request.files.add(file);
+
+    expect(request, bodyMatches('''
+        --{{boundary}}
+        content-type: application/json; charset=UTF-8
+        content-disposition: form-data; name="file"
+
+        {"hello": "world"}
+        --{{boundary}}--
+        '''));
+  });
+
+  // TODO(nweiz): test creating a multipart file with a charset other than UTF-8
+  // once issue 6284 is fixed.
+
+  // TODO(nweiz): test creating a string with a unicode body once issue 6284 is
+  // fixed.
+
+  test('with a stream file', () {
+    var request = new http.MultipartRequest('POST', dummyUrl);
+    var stream = new ListInputStream();
+    request.files.add(new http.MultipartFile('file', stream, 5));
+
+    expect(request, bodyMatches('''
+        --{{boundary}}
+        content-type: application/octet-stream
+        content-disposition: form-data; name="file"
+
+        hello
+        --{{boundary}}--
+        '''));
+
+    stream.write([104, 101, 108, 108, 111]);
+    stream.markEndOfStream();
+  });
+
+  test('with an empty stream file', () {
+    var request = new http.MultipartRequest('POST', dummyUrl);
+    var stream = new ListInputStream();
+    stream.markEndOfStream();
+    request.files.add(new http.MultipartFile('file', stream, 0));
+
+    expect(request, bodyMatches('''
+        --{{boundary}}
+        content-type: application/octet-stream
+        content-disposition: form-data; name="file"
+
+        
+        --{{boundary}}--
+        '''));
+  });
+
+  test('with a byte file', () {
+    var request = new http.MultipartRequest('POST', dummyUrl);
+    var file = new http.MultipartFile.fromBytes(
+        'file', [104, 101, 108, 108, 111]);
+    request.files.add(file);
+
+    expect(request, bodyMatches('''
+        --{{boundary}}
+        content-type: application/octet-stream
+        content-disposition: form-data; name="file"
+
+        hello
+        --{{boundary}}--
+        '''));
+  });
+}