Client-based geolocation support.

chrome/renderer/geolocation_dispatcher.cc

+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#if defined(ENABLE_CLIENT_BASED_GEOLOCATION)
+
+#include "chrome/renderer/geolocation_dispatcher.h"
+
+#include "chrome/renderer/render_view.h"
+#include "ipc/ipc_message.h"
+#include "third_party/WebKit/WebKit/chromium/public/WebGeolocationPermissionRequest.h"
+#include "third_party/WebKit/WebKit/chromium/public/WebGeolocationPermissionRequestManager.h"
+#include "third_party/WebKit/WebKit/chromium/public/WebGeolocationClient.h"
+#include "third_party/WebKit/WebKit/chromium/public/WebGeolocationPosition.h"
+#include "third_party/WebKit/WebKit/chromium/public/WebGeolocationError.h"
+#include "third_party/WebKit/WebKit/chromium/public/WebSecurityOrigin.h"
+
+using namespace WebKit;
+
+GeolocationDispatcher::GeolocationDispatcher(RenderView* render_view)
+    : render_view_(render_view),
+      pending_permissions_(new WebGeolocationPermissionRequestManager()),
+      enable_high_accuracy_(false),
+      updating_(false) {
+}
+
+GeolocationDispatcher::~GeolocationDispatcher() {}
+
+bool GeolocationDispatcher::OnMessageReceived(const IPC::Message& message) {
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP(GeolocationDispatcher, message)
+    IPC_MESSAGE_HANDLER(ViewMsg_Geolocation_PermissionSet,
+                        OnGeolocationPermissionSet)
+    IPC_MESSAGE_HANDLER(ViewMsg_Geolocation_PositionUpdated,
+                        OnGeolocationPositionUpdated)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP()
+  return handled;
+}
+
+void GeolocationDispatcher::geolocationDestroyed() {
+  controller_.reset();
+  DCHECK(!updating_);
+}
+
+void GeolocationDispatcher::startUpdating() {
+  // TODO(jknotten): Remove url and bridge_id from StartUpdating message
+  // once we have switched over to client-based geolocation.
+  GURL url;
+  render_view_->Send(new ViewHostMsg_Geolocation_StartUpdating(
+      render_view_->routing_id(), -1, url, enable_high_accuracy_));
+  updating_ = true;
+}
+
+void GeolocationDispatcher::stopUpdating() {
+  // TODO(jknotten): Remove url and bridge_id from StopUpdating message
+  // once we have switched over to client-based geolocation.
+  render_view_->Send(new ViewHostMsg_Geolocation_StopUpdating(
+      render_view_->routing_id(), -1));
+  updating_ = false;
+}
+
+void GeolocationDispatcher::setEnableHighAccuracy(bool enable_high_accuracy) {
+  // GeolocationController calls setEnableHighAccuracy(true) before
+  // startUpdating in response to the first high-accuracy Geolocation
+  // subscription. When the last high-accuracy Geolocation unsubscribes
+  // it calls setEnableHighAccuracy(false) after stopUpdating.
+  bool has_changed = enable_high_accuracy_ != enable_high_accuracy;
+  enable_high_accuracy_ = enable_high_accuracy;
+  // We have a different accuracy requirement. Request browser to update.
+  if (updating_ && has_changed)
+    startUpdating();
+}
+
+void GeolocationDispatcher::setController(
+    WebGeolocationController* controller) {
+  controller_.reset(controller);
+}
+
+bool GeolocationDispatcher::lastPosition(WebGeolocationPosition&) {
+  // The latest position is stored in the browser, not the renderer, so we
+  // would have to fetch it synchronously to give a good value here.  The
+  // WebCore::GeolocationController already caches the last position it
+  // receives, so there is not much benefit to more position caching here.
+  return false;
+}
+
+// TODO(jknotten): Change the messages to use a security origin, so no
+// conversion is necessary.
+void GeolocationDispatcher::requestPermission(
+    const WebGeolocationPermissionRequest& permissionRequest) {
+  int bridge_id = pending_permissions_->add(permissionRequest);
+  string16 origin = permissionRequest.securityOrigin().toString();
+  render_view_->Send(new ViewHostMsg_Geolocation_RequestPermission(
+      render_view_->routing_id(), bridge_id, GURL(origin)));
+}
+
+// TODO(jknotten): Change the messages to use a security origin, so no
+// conversion is necessary.
+void GeolocationDispatcher::cancelPermissionRequest(
+    const WebGeolocationPermissionRequest& permissionRequest) {
+  int bridge_id;
+  if (!pending_permissions_->remove(permissionRequest, bridge_id))
+    return;
+  string16 origin = permissionRequest.securityOrigin().toString();
+  render_view_->Send(new ViewHostMsg_Geolocation_CancelPermissionRequest(
+      render_view_->routing_id(), bridge_id, GURL(origin)));
+}
+
+// Permission for using geolocation has been set.
+void GeolocationDispatcher::OnGeolocationPermissionSet(
+    int bridge_id, bool is_allowed) {
+  WebGeolocationPermissionRequest permissionRequest;
+  if (!pending_permissions_->remove(bridge_id, permissionRequest))
+    return;
+  permissionRequest.setIsAllowed(is_allowed);
+}
+
+// We have an updated geolocation position or error code.
+void GeolocationDispatcher::OnGeolocationPositionUpdated(
+    const Geoposition& geoposition) {
+  DCHECK(updating_);
+  DCHECK(geoposition.IsInitialized());
+  if (geoposition.IsValidFix()) {
+    controller_->positionChanged(
+        WebGeolocationPosition(
+            static_cast<int64>(geoposition.timestamp.ToDoubleT() * 1000),
+            geoposition.latitude, geoposition.longitude,
+            geoposition.accuracy,
+            geoposition.is_valid_altitude(), geoposition.altitude,
+            geoposition.is_valid_altitude_accuracy(),
+            geoposition.altitude_accuracy,
+            geoposition.is_valid_heading(), geoposition.heading,
+            geoposition.is_valid_speed(), geoposition.speed));
+  } else {
+    WebGeolocationError::Error code;
+    switch (geoposition.error_code) {
+      case Geoposition::ERROR_CODE_PERMISSION_DENIED:
+        code = WebGeolocationError::ErrorPermissionDenied;
+        break;
+      case Geoposition::ERROR_CODE_POSITION_UNAVAILABLE:
+        code = WebGeolocationError::ErrorPositionUnavailable;
+        break;
+      default:
+        DCHECK(false);
+        NOTREACHED() << geoposition.error_code;
+        return;
+    }
+    controller_->errorOccurred(
+        WebGeolocationError(
+            code, WebKit::WebString::fromUTF8(geoposition.error_message)));
+  }
+}
+
+#endif // CLIENT_BASED_GEOLOCATION