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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 } // namespace | |
| 20 | |
| 21 namespace extensions { | |
| 22 | |
| 23 namespace api { | |
| 24 | |
| 25 DocumentScanScanFunction::DocumentScanScanFunction() | |
| 26 : document_scan_interface_(DocumentScanInterface::CreateInstance()) {} | |
| 27 | |
| 28 DocumentScanScanFunction::~DocumentScanScanFunction() {} | |
| 29 | |
| 30 bool DocumentScanScanFunction::Prepare() { | |
| 31 set_work_thread_id(BrowserThread::FILE); | |
| 32 params_ = document_scan::Scan::Params::Create(*args_); | |
| 33 EXTENSION_FUNCTION_VALIDATE(params_.get()); | |
| 34 return true; | |
| 35 } | |
| 36 | |
| 37 void DocumentScanScanFunction::AsyncWorkStart() { | |
| 38 if (!user_gesture()) { | |
| 39 error_ = kUserGestureRequiredError; | |
| 40 AsyncWorkCompleted(); | |
| 41 return; | |
| 42 } | |
| 43 | |
| 44 // Add a reference, which is balanced in OnScannerListReceived to keep the | |
| 45 // object around and allow the callback to be invoked. | |
| 46 AddRef(); | |
| 47 | |
| 48 document_scan_interface_->ListScanners( | |
| 49 base::Bind(&DocumentScanScanFunction::OnScannerListReceived, | |
| 50 base::Unretained(this))); | |
| 51 } | |
| 52 | |
| 53 void DocumentScanScanFunction::OnScannerListReceived( | |
| 54 const std::vector<DocumentScanInterface::ScannerDescription>& | |
| 55 scanner_descriptions, | |
| 56 const std::string& error) { | |
| 57 std::vector<DocumentScanInterface::ScannerDescription>::const_iterator | |
| 58 scanner_i = scanner_descriptions.begin(); | |
| 59 if (params_->options.mime_types) { | |
| 60 std::vector<std::string>& mime_types = *params_->options.mime_types.get(); | |
| 61 for (; scanner_i != scanner_descriptions.end(); ++scanner_i) { | |
| 62 if (std::find(mime_types.begin(), mime_types.end(), | |
| 63 scanner_i->image_mime_type) != mime_types.end()) { | |
| 64 break; | |
| 65 } | |
| 66 } | |
| 67 } | |
| 68 | |
| 69 if (scanner_i == scanner_descriptions.end()) { | |
| 70 error_ = kScannerNotAvailable; | |
| 71 AsyncWorkCompleted(); | |
| 72 | |
| 73 // Balance the AddRef in AsyncWorkStart(). | |
| 74 Release(); | |
| 75 return; | |
| 76 } | |
| 77 | |
| 78 // TODO(pstew): Display a user interface for choosing a scanner. | |
| 79 // This is where the scan mode, DPI, etc, would be specified. | |
| 80 | |
| 81 document_scan_interface_->Scan( | |
| 82 scanner_i->name, | |
| 83 DocumentScanInterface::kScanModeColor, | |
| 84 0, | |
| 85 base::Bind(&DocumentScanScanFunction::OnResultsReceived, | |
| 86 base::Unretained(this))); | |
| 87 } | |
| 88 | |
| 89 void DocumentScanScanFunction::OnResultsReceived( | |
| 90 const std::string& scanned_image, | |
| 91 const std::string& mime_type, | |
| 92 const std::string& error) { | |
| 93 // TODO(pstew): Display received scan in the UI and confirm that this | |
| 94 // scan should be sent to the caller. If this is a multi-page scan, | |
| 95 // provide a means for adding additional scanned images up to the | |
| 96 // requested limit. | |
| 97 | |
| 98 if (error.empty()) { | |
| 99 document_scan::ScanResults scan_results; | |
| 100 if (!scanned_image.empty()) { | |
| 101 scan_results.data_urls.push_back(scanned_image); | |
| 102 } | |
| 103 scan_results.mime_type = mime_type; | |
| 104 results_ = document_scan::Scan::Results::Create(scan_results); | |
| 105 } | |
| 106 error_ = error; | |
| 107 AsyncWorkCompleted(); | |
| 108 | |
| 109 // Balance the AddRef in AsyncWorkStart(). | |
| 110 Release(); | |
| 111 } | |
| 112 | |
| 113 bool DocumentScanScanFunction::Respond() { | |
| 114 return error_.empty(); | |
| 115 } | |
| 116 | |
| 117 } // namespace api | |
| 118 | |
| 119 } // namespace extensions | |
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Chromium Code Reviews
Issue 655833007:
Revert "Implement a JavaScript API for document scanning" (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master