1 // Copyright 2013 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 #include "chrome/browser/safe_json_parser.h"
6
7 #include "chrome/common/chrome_utility_messages.h"
8 #include "content/public/browser/browser_thread.h"
9 #include "content/public/browser/utility_process_host.h"
10
11 using content::BrowserThread;
12 using content::UtilityProcessHost;
13
SafeJsonParser(const std::string & unsafe_json,const SuccessCallback & success_callback,const ErrorCallback & error_callback)14 SafeJsonParser::SafeJsonParser(const std::string& unsafe_json,
15 const SuccessCallback& success_callback,
16 const ErrorCallback& error_callback)
17 : unsafe_json_(unsafe_json),
18 success_callback_(success_callback),
19 error_callback_(error_callback) {}
20
Start()21 void SafeJsonParser::Start() {
22 DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
23 BrowserThread::PostTask(
24 BrowserThread::IO,
25 FROM_HERE,
26 base::Bind(&SafeJsonParser::StartWorkOnIOThread, this));
27 }
28
~SafeJsonParser()29 SafeJsonParser::~SafeJsonParser() {}
30
StartWorkOnIOThread()31 void SafeJsonParser::StartWorkOnIOThread() {
32 DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
33 UtilityProcessHost* host =
34 UtilityProcessHost::Create(this, base::MessageLoopProxy::current().get());
35 host->Send(new ChromeUtilityMsg_ParseJSON(unsafe_json_));
36 }
37
OnJSONParseSucceeded(const base::ListValue & wrapper)38 void SafeJsonParser::OnJSONParseSucceeded(const base::ListValue& wrapper) {
39 DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
40 const base::Value* value = NULL;
41 CHECK(wrapper.Get(0, &value));
42
43 parsed_json_.reset(value->DeepCopy());
44 ReportResults();
45 }
46
OnJSONParseFailed(const std::string & error_message)47 void SafeJsonParser::OnJSONParseFailed(const std::string& error_message) {
48 DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
49 error_ = error_message;
50 ReportResults();
51 }
52
ReportResults()53 void SafeJsonParser::ReportResults() {
54 DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
55
56 BrowserThread::PostTask(
57 BrowserThread::UI,
58 FROM_HERE,
59 base::Bind(&SafeJsonParser::ReportResultOnUIThread, this));
60 }
61
ReportResultOnUIThread()62 void SafeJsonParser::ReportResultOnUIThread() {
63 DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
64 if (error_.empty() && parsed_json_) {
65 if (!success_callback_.is_null())
66 success_callback_.Run(parsed_json_.Pass());
67 } else {
68 if (!error_callback_.is_null())
69 error_callback_.Run(error_);
70 }
71 }
72
OnMessageReceived(const IPC::Message & message)73 bool SafeJsonParser::OnMessageReceived(const IPC::Message& message) {
74 bool handled = true;
75 IPC_BEGIN_MESSAGE_MAP(SafeJsonParser, message)
76 IPC_MESSAGE_HANDLER(ChromeUtilityHostMsg_ParseJSON_Succeeded,
77 OnJSONParseSucceeded)
78 IPC_MESSAGE_HANDLER(ChromeUtilityHostMsg_ParseJSON_Failed,
79 OnJSONParseFailed)
80 IPC_MESSAGE_UNHANDLED(handled = false)
81 IPC_END_MESSAGE_MAP()
82 return handled;
83 }
84