Implement the file chooser as a new resource "host"

content/renderer/pepper/pepper_file_chooser_host.cc

+// Copyright (c) 2012 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.
+
+#include "content/renderer/pepper/pepper_file_chooser_host.h"
+
+#include "base/file_path.h"
+#include "base/utf_string_conversions.h"
+#include "content/renderer/pepper/pepper_instance_state_accessor.h"
+#include "content/renderer/render_view_impl.h"
+#include "ppapi/c/pp_errors.h"
+#include "ppapi/host/dispatch_host_message.h"
+#include "ppapi/host/host_message_context.h"
+#include "ppapi/host/ppapi_host.h"
+#include "ppapi/proxy/ppapi_messages.h"
+#include "ppapi/proxy/ppb_file_ref_proxy.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebCString.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebFileChooserCompletion.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebFileChooserParams.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebString.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebVector.h"
+#include "webkit/plugins/ppapi/ppb_file_ref_impl.h"
+
+namespace content {
+
+class PepperFileChooserHost::CompletionHandler
+    : public WebKit::WebFileChooserCompletion {
+ public:
+  CompletionHandler(const base::WeakPtr<PepperFileChooserHost>& host)
+      : host_(host) {
+  }
+
+  virtual ~CompletionHandler() {}
+
+  virtual void didChooseFile(
+      const WebKit::WebVector<WebKit::WebString>& file_names) {
+    if (host_) {
+      std::vector<PepperFileChooserHost::ChosenFileInfo> files;
+      for (size_t i = 0; i < file_names.size(); i++) {
+        files.push_back(PepperFileChooserHost::ChosenFileInfo(
+            file_names[i].utf8(), std::string()));
+      }
+      host_->StoreChosenFiles(files);
+    }
+
+    // It is the responsibility of this method to delete the instance.
+    delete this;
+  }
+  virtual void didChooseFile(
+      const WebKit::WebVector<SelectedFileInfo>& file_names) {
+    if (host_) {
+      std::vector<PepperFileChooserHost::ChosenFileInfo> files;
+      for (size_t i = 0; i < file_names.size(); i++) {
+        files.push_back(PepperFileChooserHost::ChosenFileInfo(
+            file_names[i].path.utf8(),
+            file_names[i].displayName.utf8()));
+      }
+      host_->StoreChosenFiles(files);
+    }
+
+    // It is the responsibility of this method to delete the instance.
+    delete this;
+  }
+
+ private:
+  base::WeakPtr<PepperFileChooserHost> host_;
+
+  DISALLOW_COPY_AND_ASSIGN(CompletionHandler);
+};
+
+PepperFileChooserHost::ChosenFileInfo::ChosenFileInfo(
+    const std::string& path,
+    const std::string& display_name)
+    : path(path),
+      display_name(display_name) {
+}
+
+
+PepperFileChooserHost::PepperFileChooserHost(
+    ppapi::host::PpapiHost* host,
+    PP_Instance instance,
+    PP_Resource resource,
+    RenderViewImpl* render_view,
+    PepperInstanceStateAccessor* state)
+    : ResourceHost(host, instance, resource),
+      render_view_(render_view),
+      instance_state_(state),
+      handler_(NULL) {
+}
+
+PepperFileChooserHost::~PepperFileChooserHost() {
+}
+
+int32_t PepperFileChooserHost::OnResourceMessageReceived(
+    const IPC::Message& msg,
+    ppapi::host::HostMessageContext* context) {
+  IPC_BEGIN_MESSAGE_MAP(PepperFileChooserHost, msg)
+    PPAPI_DISPATCH_HOST_RESOURCE_CALL(PpapiHostMsg_FileChooser_Show,
+                                      OnMsgShow)
+  IPC_END_MESSAGE_MAP()
+  return PP_ERROR_FAILED;
+}
+
+void PepperFileChooserHost::StoreChosenFiles(
+    const std::vector<ChosenFileInfo>& files) {
+  std::vector<ppapi::PPB_FileRef_CreateInfo> chosen_files;
+  for (size_t i = 0; i < files.size(); i++) {
+#if defined(OS_WIN)
+    FilePath file_path(UTF8ToWide(files[i].path));
+#else
+    FilePath file_path(files[i].path);
+#endif
+
+    webkit::ppapi::PPB_FileRef_Impl* ref =
+        webkit::ppapi::PPB_FileRef_Impl::CreateExternal(
+        pp_instance(), file_path, files[i].display_name);
+    ppapi::PPB_FileRef_CreateInfo create_info;
+    ppapi::proxy::PPB_FileRef_Proxy::SerializeFileRef(ref->GetReference(),
+                                                      &create_info);
+    chosen_files.push_back(create_info);
+  }
+
+  reply_params.set_result((chosen_files.size() > 0) ? PP_OK
+                                                    : PP_ERROR_USERCANCEL);
+  host()->SendReply(reply_params_,
+                    PpapiPluginMsg_FileChooser_ShowReply(chosen_files));
+
+  reply_params_ = ppapi::proxy::ResourceMessageReplyParams();
+  handler_ = NULL;  // Handler deletes itself.
+}
+
+int32_t PepperFileChooserHost::OnMsgShow(
+    ppapi::host::HostMessageContext* context,
+    bool save_as,
+    bool open_multiple,
+    const std::string& suggested_file_name,
+    const std::vector<std::string>& accept_mime_types) {
+  if (handler_)
+    return PP_ERROR_INPROGRESS;  // Already pending.
+
+  if (!host()->permissions().HasPermission(
+          ppapi::PERMISSION_BYPASS_USER_GESTURE) &&
+       !instance_state_->HasUserGesture(pp_instance())) {
+    return PP_ERROR_NO_USER_GESTURE;
+  }
+
+  WebKit::WebFileChooserParams params;
+  if (save_as) {
+    params.saveAs = true;
+    params.initialValue = WebKit::WebString::fromUTF8(
+        suggested_file_name.data(), suggested_file_name.size());
+  } else {
+    params.multiSelect = open_multiple;
+  }
+  std::vector<WebKit::WebString> mine_types(accept_mime_types.size());
+  for (size_t i = 0; i < accept_mime_types.size(); i++) {
+    mine_types[i] = WebKit::WebString::fromUTF8(
+        accept_mime_types[i].data(), accept_mime_types[i].size());
+  }
+  params.acceptTypes = mine_types;
+  params.directory = false;
+
+  handler_ = new CompletionHandler(AsWeakPtr());
+  if (!render_view_->runFileChooser(params, handler_)) {
+    delete handler_;
+    handler_ = NULL;
+    return PP_ERROR_NOACCESS;
+  }
+
+  reply_params_ = ppapi::proxy::ResourceMessageReplyParams(
+      context->params.pp_resource(),
+      context->params.sequence());
+  return PP_OK_COMPLETIONPENDING;
+}
+
+}  // namespace content