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1 // Copyright 2015 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 #ifndef COMPONENTS_CERTIFICATE_TRANSPARENCY_LOG_PROOF_FETCHER_H_ | |
6 #define COMPONENTS_CERTIFICATE_TRANSPARENCY_LOG_PROOF_FETCHER_H_ | |
7 | |
8 #include <map> | |
9 #include <string> | |
10 | |
11 #include "base/callback.h" | |
12 #include "base/macros.h" | |
13 #include "base/memory/scoped_ptr.h" | |
14 #include "base/memory/weak_ptr.h" | |
15 #include "net/url_request/url_request.h" | |
16 | |
17 namespace base { | |
18 class Value; | |
19 } // namespace base | |
20 | |
21 namespace net { | |
22 | |
23 class URLRequestContext; | |
24 | |
25 namespace ct { | |
26 struct SignedTreeHead; | |
27 } // namespace ct | |
28 | |
29 } // namespace net | |
30 | |
31 class GURL; | |
32 | |
33 namespace certificate_transparency { | |
34 | |
35 // Fetches Signed Tree Heads (STHs) and consistency proofs from Certificate | |
36 // Transparency logs using the URLRequestContext provided during the instance | |
37 // construction. | |
mmenke
2015/08/03 18:18:54
Should mention here, or above the constructor, tha
Eran Messeri
2015/08/04 16:15:43
Done.
| |
38 class LogProofFetcher : public net::URLRequest::Delegate { | |
39 public: | |
40 // Callback for successful retrieval of Signed Tree Heads. Called | |
41 // with the log_id of the log the STH belogs to (as supplied by the caller | |
42 // to FetchSignedTreeHead) and the STH itself. | |
43 using SignedTreeHeadFetchedCallback = | |
44 base::Callback<void(const std::string& log_id, | |
45 const net::ct::SignedTreeHead& signed_tree_head)>; | |
46 | |
47 // Callback for failure of Signed Tree Head retrieval. Called with the log_id | |
48 // that the log fetching was requested for and a net error code of the | |
49 // failure. | |
50 using FetchFailedCallback = base::Callback< | |
51 void(const std::string& log_id, int net_error, int http_response_code)>; | |
52 | |
53 explicit LogProofFetcher(net::URLRequestContext* request_context); | |
54 ~LogProofFetcher() override; | |
55 | |
56 // Fetch the latest Signed Tree Head from the log identified by |log_id| | |
57 // from |base_log_url|. The |log_id| will be passed into the callbacks to | |
58 // identify the log the retrieved Signed Tree Head belongs to. | |
59 // It is possible, but does not make a lot of sense, to have multiple | |
60 // Signed Tree Head fetching requests going out to the same log, since | |
61 // they are likely to return the same result. | |
mmenke
2015/08/03 18:18:54
Maybe mention that callbacks won't be invoked if d
Eran Messeri
2015/08/04 16:15:43
Done.
| |
62 // TODO(eranm): Think further about whether multiple requests to the same | |
63 // log imply cancellation of previous requests, should be coalesced or handled | |
64 // independently. | |
65 void FetchSignedTreeHead( | |
66 const GURL& base_log_url, | |
67 const std::string& log_id, | |
68 const SignedTreeHeadFetchedCallback& fetched_callback, | |
69 const FetchFailedCallback& failed_callback); | |
70 | |
71 // net::URLRequest::Delegate | |
72 void OnResponseStarted(net::URLRequest* request) override; | |
73 void OnReadCompleted(net::URLRequest* request, int bytes_read) override; | |
74 | |
75 private: | |
76 struct FetchState { | |
77 FetchState(const std::string& id, | |
mmenke
2015/08/03 18:18:54
suggest calling this log_id to match the correspon
Eran Messeri
2015/08/04 16:15:42
Done.
| |
78 const SignedTreeHeadFetchedCallback& fetched_callback, | |
79 const FetchFailedCallback& failed_callback); | |
80 ~FetchState(); | |
81 | |
82 std::string log_id; | |
83 SignedTreeHeadFetchedCallback fetched_callback; | |
84 FetchFailedCallback failed_callback; | |
85 scoped_refptr<net::IOBufferWithSize> response_buffer; | |
mmenke
2015/08/03 18:18:54
Need to include ref_counted.h in this file instead
Eran Messeri
2015/08/04 16:15:43
Good point, I've moved back to having a forward de
| |
86 std::string assembled_response; | |
87 }; | |
88 | |
89 // Handles the result of a URLRequest::Read call on |request|. | |
mmenke
2015/08/03 18:18:54
the result -> the final result / the non-ERR_IO_PE
Eran Messeri
2015/08/04 16:15:43
Changed to "the final result". I didn't go into mu
| |
90 // Returns true if another read should be started, false if the read | |
91 // failed completely or we have to wait for OnResponseStarted to | |
92 // be called. | |
93 bool HandleReadResult(net::URLRequest* request, | |
94 FetchState* params, | |
95 int bytes_read); | |
96 | |
97 // Calls URLRequest::Read on |request| repeatedly, until HandleReadResult | |
98 // indicates it should no longer be called. Usually this would be when there | |
99 // is pending IO that requires waiting for OnResponseStarted to be called. | |
100 void StartNextRead(net::URLRequest* request, FetchState* params); | |
101 | |
102 // Performs post-report cleanup. | |
103 void RequestComplete(net::URLRequest* request); | |
104 // Deletes the request and associated FetchState from the internal map. | |
105 void CleanupRequest(net::URLRequest* request); | |
106 | |
107 // Callbacks for parsing the STH's JSON by the SafeJsonParser | |
108 void OnSTHJsonParseSuccess(net::URLRequest* request, | |
109 scoped_ptr<base::Value> parsed_json); | |
110 void OnSTHJsonParseError(net::URLRequest* request, const std::string& error); | |
111 | |
112 net::URLRequestContext* const request_context_; | |
113 | |
114 // Owns the contained requests, as well as FetchState. | |
115 std::map<net::URLRequest*, FetchState*> inflight_requests_; | |
116 | |
117 base::WeakPtrFactory<LogProofFetcher> weak_factory_; | |
118 | |
119 DISALLOW_COPY_AND_ASSIGN(LogProofFetcher); | |
120 }; | |
121 | |
122 } // namespace certificate_transparency | |
123 | |
124 #endif // COMPONENTS_CERTIFICATE_TRANSPARENCY_LOG_PROOF_FETCHER_H_ | |
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