1 // Copyright 2017 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 "content/browser/android/nfc_host.h"
6
7 #include <utility>
8
9 #include "base/atomic_sequence_num.h"
10 #include "content/browser/permissions/permission_controller_impl.h"
11 #include "content/public/android/content_jni_headers/NfcHost_jni.h"
12 #include "content/public/browser/device_service.h"
13 #include "content/public/browser/navigation_handle.h"
14 #include "content/public/browser/web_contents.h"
15 #include "services/device/public/mojom/nfc.mojom.h"
16 #include "third_party/blink/public/mojom/permissions/permission_status.mojom.h"
17
18 namespace content {
19
20 namespace {
21 base::AtomicSequenceNumber g_unique_id;
22 } // namespace
23
NFCHost(WebContents * web_contents)24 NFCHost::NFCHost(WebContents* web_contents)
25 : WebContentsObserver(web_contents) {
26 DCHECK(web_contents);
27
28 permission_controller_ = PermissionControllerImpl::FromBrowserContext(
29 web_contents->GetBrowserContext());
30 }
31
~NFCHost()32 NFCHost::~NFCHost() {
33 Close();
34 }
35
GetNFC(RenderFrameHost * render_frame_host,mojo::PendingReceiver<device::mojom::NFC> receiver)36 void NFCHost::GetNFC(RenderFrameHost* render_frame_host,
37 mojo::PendingReceiver<device::mojom::NFC> receiver) {
38 // https://w3c.github.io/web-nfc/#security-policies
39 // WebNFC API must be only accessible from top level browsing context.
40 if (render_frame_host->GetParent()) {
41 mojo::ReportBadMessage(
42 "WebNFC is only allowed in a top-level browsing context.");
43 return;
44 }
45
46 GURL origin_url = render_frame_host->GetLastCommittedOrigin().GetURL();
47 if (permission_controller_->GetPermissionStatusForFrame(
48 PermissionType::NFC, render_frame_host, origin_url) !=
49 blink::mojom::PermissionStatus::GRANTED) {
50 return;
51 }
52
53 if (subscription_id_ == PermissionController::kNoPendingOperation) {
54 // base::Unretained() is safe here because the subscription is canceled when
55 // this object is destroyed.
56 subscription_id_ = permission_controller_->SubscribePermissionStatusChange(
57 PermissionType::NFC, render_frame_host, origin_url,
58 base::BindRepeating(&NFCHost::OnPermissionStatusChange,
59 base::Unretained(this)));
60 }
61
62 if (!nfc_provider_) {
63 content::GetDeviceService().BindNFCProvider(
64 nfc_provider_.BindNewPipeAndPassReceiver());
65 }
66
67 JNIEnv* env = base::android::AttachCurrentThread();
68
69 // The created instance's reference is kept inside a map in Java world.
70 int id = g_unique_id.GetNext();
71 Java_NfcHost_create(env, web_contents()->GetJavaWebContents(), id);
72
73 // Connect to an NFC object, associating it with |id_|.
74 nfc_provider_->GetNFCForHost(id, std::move(receiver));
75 }
76
RenderFrameHostChanged(RenderFrameHost * old_host,RenderFrameHost * new_host)77 void NFCHost::RenderFrameHostChanged(RenderFrameHost* old_host,
78 RenderFrameHost* new_host) {
79 // If the main frame has been replaced then close an old NFC connection.
80 if (!new_host->GetParent())
81 Close();
82 }
83
OnVisibilityChanged(Visibility visibility)84 void NFCHost::OnVisibilityChanged(Visibility visibility) {
85 // For cases NFC not initialized, such as the permission has been revoked.
86 if (!nfc_provider_)
87 return;
88
89 // NFC operations should be suspended.
90 // https://w3c.github.io/web-nfc/#nfc-suspended
91 if (visibility == Visibility::VISIBLE)
92 nfc_provider_->ResumeNFCOperations();
93 else
94 nfc_provider_->SuspendNFCOperations();
95 }
96
OnPermissionStatusChange(blink::mojom::PermissionStatus status)97 void NFCHost::OnPermissionStatusChange(blink::mojom::PermissionStatus status) {
98 if (status != blink::mojom::PermissionStatus::GRANTED)
99 Close();
100 }
101
Close()102 void NFCHost::Close() {
103 nfc_provider_.reset();
104 if (subscription_id_ != PermissionController::kNoPendingOperation) {
105 permission_controller_->UnsubscribePermissionStatusChange(subscription_id_);
106 subscription_id_ = PermissionController::kNoPendingOperation;
107 }
108 }
109
110 } // namespace content
111