1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
|
// Copyright 2008, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// MimeSnifferProxy wraps an URLRequest to use mime_util's MIME
// sniffer to better report the content's MIME type.
// It only supports a subset of the URLRequest API, and must be used together
// with an URLRequest. Their lifetimes should be the same.
//
// To use it, create a normal URLRequest and initialize it appropriately,
// then insert a MimeSnifferProxy between your object and the URLRequest:
// ms_.reset(new MimeSnifferProxy(url_request, this));
// It then proxies URLRequest delegate callbacks (from URLRequest back into
// your object) appropriately.
//
// For the other direction of calls (from your object to URLRequest), be sure
// to use two MimeSniffed functions in place of the URLRequest functions:
// 1) ms_->Read() -- just like URLRequest::Read()
// 2) ms_->mime_type() -- returns the sniffed mime type of the data;
// valid after OnResponseStarted() is called.
#include "net/url_request/url_request.h"
class MimeSnifferProxy : public URLRequest::Delegate {
public:
// The constructor inserts this MimeSnifferProxy in between the URLRequest
// and the URLRequest::Delegate, so that the URLRequest's delegate callbacks
// first go through the MimeSnifferProxy.
MimeSnifferProxy(URLRequest* request, URLRequest::Delegate* delegate);
// URLRequest::Delegate implementation.
// These first two functions are handled specially:
virtual void OnResponseStarted(URLRequest* request);
virtual void OnReadCompleted(URLRequest* request, int bytes_read);
// The remaining three just proxy directly to the delegate:
virtual void OnReceivedRedirect(URLRequest* request,
const GURL& new_url) {
delegate_->OnReceivedRedirect(request, new_url);
}
virtual void OnAuthRequired(URLRequest* request,
net::AuthChallengeInfo* auth_info) {
delegate_->OnAuthRequired(request, auth_info);
}
virtual void OnSSLCertificateError(URLRequest* request,
int cert_error,
net::X509Certificate* cert) {
delegate_->OnSSLCertificateError(request, cert_error, cert);
}
// Wrapper around URLRequest::Read.
bool Read(char* buf, int max_bytes, int *bytes_read);
// Return the sniffed mime type of the request. Valid after
// OnResponseStarted() has been called on the delegate.
const std::string& mime_type() const { return mime_type_; }
private:
// The request underneath us.
URLRequest* request_;
// The delegate above us, that we're proxying the request to.
URLRequest::Delegate* delegate_;
// The (sniffed, if necessary) request mime type.
std::string mime_type_;
// Whether we're sniffing this request.
bool sniff_content_;
// Whether we've encountered an error on our initial Read().
bool error_;
// A buffer for the first bit of the request.
char buf_[1024];
// The number of bytes we've read into the buffer.
int bytes_read_;
};
|
