1// Copyright 2014 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4//
5// A delegate class of WebURLLoaderImpl that handles multipart/x-mixed-replace
6// data.  We special case multipart/x-mixed-replace because WebCore expects a
7// separate didReceiveResponse for each new message part.
8//
9// Most of the logic and edge case handling are based on the Mozilla's
10// implementation in netwerk/streamconv/converters/nsMultiMixedConv.cpp.
11// This seems like a derivative work, so here's the original license:
12
13/* ***** BEGIN LICENSE BLOCK *****
14 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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16 * The contents of this file are subject to the Mozilla Public License Version
17 * 1.1 (the "License"); you may not use this file except in compliance with
18 * the License. You may obtain a copy of the License at
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20 *
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22 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
23 * for the specific language governing rights and limitations under the
24 * License.
25 *
26 * The Original Code is mozilla.org code.
27 *
28 * The Initial Developer of the Original Code is
29 * Netscape Communications Corporation.
30 * Portions created by the Initial Developer are Copyright (C) 1998
31 * the Initial Developer. All Rights Reserved.
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48
49#ifndef CONTENT_CHILD_MULTIPART_RESPONSE_DELEGATE_H_
50#define CONTENT_CHILD_MULTIPART_RESPONSE_DELEGATE_H_
51
52#include <string>
53
54#include "base/basictypes.h"
55#include "content/common/content_export.h"
56#include "third_party/WebKit/public/platform/WebURLResponse.h"
57
58namespace blink {
59class WebURLLoader;
60class WebURLLoaderClient;
61}
62
63namespace content {
64
65class CONTENT_EXPORT MultipartResponseDelegate {
66 public:
67  MultipartResponseDelegate(blink::WebURLLoaderClient* client,
68                            blink::WebURLLoader* loader,
69                            const blink::WebURLResponse& response,
70                            const std::string& boundary);
71
72  // Passed through from ResourceHandleInternal
73  void OnReceivedData(const char* data, int data_len, int encoded_data_length);
74  void OnCompletedRequest();
75
76  // The request has been canceled, so stop making calls to the client.
77  void Cancel() {
78    client_ = NULL;
79    loader_ = NULL;
80  }
81
82  // Returns the multi part boundary string from the Content-type header
83  // in the response.
84  // Returns true on success.
85  static bool ReadMultipartBoundary(const blink::WebURLResponse& response,
86                                    std::string* multipart_boundary);
87
88  // Returns the lower and higher content ranges from an individual multipart
89  // in a multipart response.
90  // Returns true on success.
91  static bool ReadContentRanges(
92      const blink::WebURLResponse& response,
93      int64* content_range_lower_bound,
94      int64* content_range_upper_bound,
95      int64* content_range_instance_size);
96
97 private:
98  friend class MultipartResponseDelegateTester;  // For unittests.
99
100  // Pointers to the client and associated loader so we can make callbacks as
101  // we parse pieces of data.
102  blink::WebURLLoaderClient* client_;
103  blink::WebURLLoader* loader_;
104
105  // The original resource response for this request.  We use this as a
106  // starting point for each parts response.
107  blink::WebURLResponse original_response_;
108
109  // Checks to see if data[pos] character is a line break; handles crlf, lflf,
110  // lf, or cr. Returns the number of characters to skip over (0, 1 or 2).
111  int PushOverLine(const std::string& data, size_t pos);
112
113  // Tries to parse http headers from the start of data_.  Returns true if it
114  // succeeds and sends a didReceiveResponse to m_client.  Returns false if
115  // the header is incomplete (in which case we just wait for more data).
116  bool ParseHeaders();
117
118  // Find the next boundary in data_.  Returns std::string::npos if there's no
119  // full token.
120  size_t FindBoundary();
121
122  // Transferred data size accumulated between client callbacks.
123  int encoded_data_length_;
124
125  // A temporary buffer to hold data between reads for multipart data that
126  // gets split in the middle of a header.
127  std::string data_;
128
129  // Multipart boundary token
130  std::string boundary_;
131
132  // true until we get our first on received data call
133  bool first_received_data_;
134
135  // true if we're truncated in the middle of a header
136  bool processing_headers_;
137
138  // true when we're done sending information.  At that point, we stop
139  // processing AddData requests.
140  bool stop_sending_;
141
142  // true after we've sent our first response to the WebURLLoaderClient.
143  bool has_sent_first_response_;
144
145  DISALLOW_COPY_AND_ASSIGN(MultipartResponseDelegate);
146};
147
148}  // namespace content
149
150#endif  // CONTENT_CHILD_MULTIPART_RESPONSE_DELEGATE_H_
151