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| 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 #include "chrome/browser/extensions/api/document_scan/document_scan_api.h" | |
| 6 | |
| 7 #include <algorithm> | |
| 8 | |
| 9 #include "content/public/browser/browser_thread.h" | |
| 10 #include "extensions/browser/extension_system.h" | |
| 11 | |
| 12 using content::BrowserThread; | |
| 13 | |
| 14 namespace { | |
| 15 | |
| 16 const char kScannerNotAvailable[] = "Scanner not available"; | |
| 17 const char kUserGestureRequiredError[] = | |
| 18 "User gesture required to perform scan"; | |
| 19 | |
| 20 } // namespace | |
| 21 | |
| 22 namespace extensions { | |
| 23 | |
| 24 namespace api { | |
| 25 | |
| 26 DocumentScanScanFunction::DocumentScanScanFunction() | |
| 27 : document_scan_interface_(DocumentScanInterface::CreateInstance()) {} | |
| 28 | |
| 29 DocumentScanScanFunction::~DocumentScanScanFunction() {} | |
| 30 | |
| 31 bool DocumentScanScanFunction::Prepare() { | |
| 32 set_work_thread_id(BrowserThread::FILE); | |
| 33 params_ = document_scan::Scan::Params::Create(*args_); | |
| 34 EXTENSION_FUNCTION_VALIDATE(params_.get()); | |
| 35 return true; | |
| 36 } | |
| 37 | |
| 38 void DocumentScanScanFunction::AsyncWorkStart() { | |
| 39 if (!user_gesture()) { | |
| 40 error_ = kUserGestureRequiredError; | |
| 41 AsyncWorkCompleted(); | |
| 42 return; | |
| 43 } | |
| 44 | |
| 45 // Add a reference, which is balanced in OnScannerListReceived to keep the | |
| 46 // object around and allow the callback to be invoked. | |
| 47 AddRef(); | |
| 48 | |
| 49 document_scan_interface_->ListScanners( | |
| 50 base::Bind(&DocumentScanScanFunction::OnScannerListReceived, | |
| 51 base::Unretained(this))); | |
| 52 } | |
| 53 | |
| 54 void DocumentScanScanFunction::OnScannerListReceived( | |
| 55 const std::vector<DocumentScanInterface::ScannerDescription>& | |
| 56 scanner_descriptions, | |
| 57 const std::string& error) { | |
| 58 std::vector<DocumentScanInterface::ScannerDescription>::const_iterator | |
| 59 scanner_i = scanner_descriptions.begin(); | |
| 60 | |
| 61 // If no |scanner_descriptions| is empty, this is an error. If no | |
| 62 // MIME types are specified, the first scanner is chosen. If MIME | |
| 63 // types are specified, the first scanner that supports one of these | |
| 64 // MIME types is selected. | |
| 65 if (params_->options.mime_types) { | |
| 66 std::vector<std::string>& mime_types = *params_->options.mime_types.get(); | |
| 67 for (; scanner_i != scanner_descriptions.end(); ++scanner_i) { | |
| 68 if (std::find(mime_types.begin(), mime_types.end(), | |
| 69 scanner_i->image_mime_type) != mime_types.end()) { | |
| 70 break; | |
| 71 } | |
| 72 } | |
| 73 } | |
| 74 | |
| 75 if (scanner_i == scanner_descriptions.end()) { | |
| 76 error_ = kScannerNotAvailable; | |
| 77 AsyncWorkCompleted(); | |
| 78 | |
| 79 // Balance the AddRef in AsyncWorkStart(). | |
| 80 Release(); | |
| 81 return; | |
| 82 } | |
| 83 | |
| 84 // TODO(pstew): Call a delegate method here to select a scanner and options. | |
| 85 | |
| 86 document_scan_interface_->Scan( | |
| 87 scanner_i->name, | |
| 88 DocumentScanInterface::kScanModeColor, | |
| 89 0, | |
| 90 base::Bind(&DocumentScanScanFunction::OnResultsReceived, | |
| 91 base::Unretained(this))); | |
| 92 } | |
| 93 | |
| 94 void DocumentScanScanFunction::OnResultsReceived( | |
| 95 const std::string& scanned_image, | |
| 96 const std::string& mime_type, | |
| 97 const std::string& error) { | |
| 98 | |
| 99 // TODO(pstew): Enlist a delegate to display received scan in the UI | |
| 100 // and confirm that this scan should be sent to the caller. If this | |
| 101 // is a multi-page scan, provide a means for adding additional scanned | |
| 102 // images up to the requested limit. | |
| 103 | |
| 104 if (error.empty()) { | |
| 105 document_scan::ScanResults scan_results; | |
| 106 if (!scanned_image.empty()) { | |
| 107 scan_results.data_urls.push_back(scanned_image); | |
| 108 } | |
| 109 scan_results.mime_type = mime_type; | |
| 110 results_ = document_scan::Scan::Results::Create(scan_results); | |
| 111 } | |
| 112 error_ = error; | |
| 113 AsyncWorkCompleted(); | |
| 114 | |
| 115 // Balance the AddRef in AsyncWorkStart(). | |
| 116 Release(); | |
| 117 } | |
| 118 | |
| 119 bool DocumentScanScanFunction::Respond() { | |
| 120 return error_.empty(); | |
| 121 } | |
| 122 | |
| 123 } // namespace api | |
| 124 | |
| 125 } // namespace extensions | |
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Chromium Code Reviews
Issue 899523004:
Move chrome.documentScan API to extensions/ (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master