Implementation of URLLoader using PluginResource/ResourceHost.

content/renderer/pepper/pepper_url_loader_host.cc

+// Copyright (c) 2013 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_url_loader_host.h"
+
+#include "content/public/renderer/renderer_ppapi_host.h"
+#include "net/base/net_errors.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/shared_impl/ppapi_globals.h"
+#include "third_party/WebKit/Source/Platform/chromium/public/WebURLError.h"
+#include "third_party/WebKit/Source/Platform/chromium/public/WebURLLoader.h"
+#include "third_party/WebKit/Source/Platform/chromium/public/WebURLRequest.h"
+#include "third_party/WebKit/Source/Platform/chromium/public/WebURLResponse.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebDocument.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebElement.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebKit.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebPluginContainer.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebSecurityOrigin.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebURLLoaderOptions.h"
+#include "webkit/plugins/ppapi/ppapi_plugin_instance.h"
+#include "webkit/plugins/ppapi/url_request_info_util.h"
+#include "webkit/plugins/ppapi/url_response_info_util.h"
+
+using WebKit::WebFrame;
+using WebKit::WebString;
+using WebKit::WebURL;
+using WebKit::WebURLError;
+using WebKit::WebURLLoader;
+using WebKit::WebURLLoaderOptions;
+using WebKit::WebURLRequest;
+using WebKit::WebURLResponse;
+
+#ifdef _MSC_VER
+// Do not warn about use of std::copy with raw pointers.
+#pragma warning(disable : 4996)
+#endif
+
+namespace content {
+
+PepperURLLoaderHost::PepperURLLoaderHost(RendererPpapiHost* host,
+                                         bool main_document_loader,
+                                         PP_Instance instance,
+                                         PP_Resource resource)
+    : ResourceHost(host->GetPpapiHost(), instance, resource),
+      renderer_ppapi_host_(host),
+      main_document_loader_(main_document_loader),
+      has_universal_access_(false),
+      bytes_sent_(0),
+      total_bytes_to_be_sent_(-1),
+      bytes_received_(0),
+      total_bytes_to_be_received_(-1) {
+  DCHECK((main_document_loader && !resource) ||
+         (!main_document_loader && resource));
+}
+
+PepperURLLoaderHost::~PepperURLLoaderHost() {
+  // Normally deleting this object will delete the loader which will implicitly
+  // cancel the load. But this won't happen for the main document loader. So it
+  // would be nice to issue a Close() here.
+  //
+  // However, the PDF plugin will cancel the document load and then close the
+  // resource (which is reasonable). It then makes a second request to load the
+  // document so it can set the "want progress" flags (which is unreasonable --
+  // we should probably provide download progress on document loads).
+  //
+  // But a Close() on the main document (even if the request is already
+  // canceled) will cancel all pending subresources, of which the second
+  // request is one, and the load will fail. Even if we fixed the PDF reader to
+  // change the timing or to send progress events to avoid the second request,
+  // we don't want to cancel other loads when the main one is closed.
+  //
+  // "Leaking" the main document load here by not closing it will only affect
+  // plugins handling main document loads (which are very few, mostly only PDF)
+  // that dereference without explicitly closing the main document load (which
+  // PDF doesn't do -- it explicitly closes it before issuing the second
+  // request). And the worst thing that will happen is that any remaining data
+  // will get queued inside WebKit.
+  if (main_document_loader_) {
+    // The PluginInstance has a non-owning pointer to us.
+    webkit::ppapi::PluginInstance* instance_object =
+        renderer_ppapi_host_->GetPluginInstance(pp_instance());
+    if (instance_object) {
+      DCHECK(instance_object->document_loader() == this);
+      instance_object->set_document_loader(NULL);
+    }
+  }
+
+  // There is a path whereby the destructor for the loader_ member can
+  // invoke InstanceWasDeleted() upon this URLLoaderResource, thereby
+  // re-entering the scoped_ptr destructor with the same scoped_ptr object
+  // via loader_.reset(). Be sure that loader_ is first NULL then destroy
+  // the scoped_ptr. See http://crbug.com/159429.
+  scoped_ptr<WebKit::WebURLLoader> for_destruction_only(loader_.release());
+
+  for (size_t i = 0; i < pending_replies_.size(); i++)
+    delete pending_replies_[i];
+}
+
+int32_t PepperURLLoaderHost::OnResourceMessageReceived(
+    const IPC::Message& msg,
+    ppapi::host::HostMessageContext* context) {
+  IPC_BEGIN_MESSAGE_MAP(PepperURLLoaderHost, msg)
+    PPAPI_DISPATCH_HOST_RESOURCE_CALL(
+        PpapiHostMsg_URLLoader_Open,
+        OnHostMsgOpen)
+    PPAPI_DISPATCH_HOST_RESOURCE_CALL(
+        PpapiHostMsg_URLLoader_SetDeferLoading,
+        OnHostMsgSetDeferLoading)
+    PPAPI_DISPATCH_HOST_RESOURCE_CALL_0(
+        PpapiHostMsg_URLLoader_Close,
+        OnHostMsgClose);
+    PPAPI_DISPATCH_HOST_RESOURCE_CALL_0(
+        PpapiHostMsg_URLLoader_GrantUniversalAccess,
+        OnHostMsgGrantUniversalAccess)
+  IPC_END_MESSAGE_MAP()
+  return PP_ERROR_FAILED;
+}
+
+void PepperURLLoaderHost::willSendRequest(
+    WebURLLoader* loader,
+    WebURLRequest& new_request,
+    const WebURLResponse& redirect_response) {
+  if (!request_data_.follow_redirects) {
+    SaveResponse(redirect_response);
+    SetDefersLoading(true);
+  }
+}
+
+void PepperURLLoaderHost::didSendData(
+    WebURLLoader* loader,
+    unsigned long long bytes_sent,
+    unsigned long long total_bytes_to_be_sent) {
+  // TODO(darin): Bounds check input?
+  bytes_sent_ = static_cast<int64_t>(bytes_sent);
+  total_bytes_to_be_sent_ = static_cast<int64_t>(total_bytes_to_be_sent);
+  UpdateProgress();
+}
+
+void PepperURLLoaderHost::didReceiveResponse(WebURLLoader* loader,
+                                             const WebURLResponse& response) {
+  // Sets -1 if the content length is unknown. Send before issuing callback.
+  total_bytes_to_be_received_ = response.expectedContentLength();
+  UpdateProgress();
+
+  SaveResponse(response);
+}
+
+void PepperURLLoaderHost::didDownloadData(WebURLLoader* loader,
+                                          int data_length) {
+  bytes_received_ += data_length;
+  UpdateProgress();
+}
+
+void PepperURLLoaderHost::didReceiveData(WebURLLoader* loader,
+                                         const char* data,
+                                         int data_length,
+                                         int encoded_data_length) {
+  // Note that |loader| will be NULL for document loads.
+  bytes_received_ += data_length;
+  UpdateProgress();
+
+  PpapiPluginMsg_URLLoader_SendData* message =
+      new PpapiPluginMsg_URLLoader_SendData;
+  message->WriteData(data, data_length);
+  SendUpdateToPlugin(message);
+}
+
+void PepperURLLoaderHost::didFinishLoading(WebURLLoader* loader,
+                                           double finish_time) {
+  // Note that |loader| will be NULL for document loads.
+  SendUpdateToPlugin(new PpapiPluginMsg_URLLoader_FinishedLoading(PP_OK));
+}
+
+void PepperURLLoaderHost::didFail(WebURLLoader* loader,
+                                 const WebURLError& error) {
+  // Note that |loader| will be NULL for document loads.
+  int32_t pp_error = PP_ERROR_FAILED;
+  if (error.domain.equals(WebString::fromUTF8(net::kErrorDomain))) {
+    // TODO(bbudge): Extend pp_errors.h to cover interesting network errors
+    // from the net error domain.
+    switch (error.reason) {
+      case net::ERR_ACCESS_DENIED:
+      case net::ERR_NETWORK_ACCESS_DENIED:
+        pp_error = PP_ERROR_NOACCESS;
+        break;
+    }
+  } else {
+    // It's a WebKit error.
+    pp_error = PP_ERROR_NOACCESS;
+  }
+
+  SendUpdateToPlugin(new PpapiPluginMsg_URLLoader_FinishedLoading(pp_error));
+}
+
+void PepperURLLoaderHost::DidConnectPendingHostToResource() {
+  for (size_t i = 0; i < pending_replies_.size(); i++) {
+    host()->SendUnsolicitedReply(pp_resource(), *pending_replies_[i]);
+    delete pending_replies_[i];
+  }
+  pending_replies_.clear();
+}
+
+int32_t PepperURLLoaderHost::OnHostMsgOpen(
+    ppapi::host::HostMessageContext* context,
+    const ppapi::URLRequestInfoData& request_data) {
+  // An "Open" isn't a resource Call so has no reply, but failure to open
+  // implies a load failure. To make it harder to forget to send the load
+  // failed reply from the open handler, we instead catch errors and convert
+  // them to load failed messages.
+  int32_t ret = InternalOnHostMsgOpen(context, request_data);
+  DCHECK(ret != PP_OK_COMPLETIONPENDING);
+
+  if (ret != PP_OK)
+    SendUpdateToPlugin(new PpapiPluginMsg_URLLoader_FinishedLoading(ret));
+  return PP_OK;
+}
+
+// Since this is wrapped by OnHostMsgOpen, we can return errors here and they
+// will be translated into a FinishedLoading call automatically.
+int32_t PepperURLLoaderHost::InternalOnHostMsgOpen(
+    ppapi::host::HostMessageContext* context,
+    const ppapi::URLRequestInfoData& request_data) {
+  // Main document loads are already open, so don't allow people to open them
+  // again.
+  if (main_document_loader_)
+    return PP_ERROR_INPROGRESS;
+
+  // Create a copy of the request data since CreateWebURLRequest will populate
+  // the file refs.
+  ppapi::URLRequestInfoData filled_in_request_data = request_data;
+
+  if (webkit::ppapi::URLRequestRequiresUniversalAccess(
+          filled_in_request_data) &&
+      !has_universal_access_) {
+    ppapi::PpapiGlobals::Get()->LogWithSource(
+        pp_instance(), PP_LOGLEVEL_ERROR, std::string(),
+        "PPB_URLLoader.Open: The URL you're requesting is "
+        " on a different security origin than your plugin. To request "
+        " cross-origin resources, see "
+        " PP_URLREQUESTPROPERTY_ALLOWCROSSORIGINREQUESTS.");
+    return PP_ERROR_NOACCESS;
+  }
+
+  if (loader_.get())
+    return PP_ERROR_INPROGRESS;
+
+  WebFrame* frame = GetFrame();
+  if (!frame)
+    return PP_ERROR_FAILED;
+  WebURLRequest web_request;
+  if (!webkit::ppapi::CreateWebURLRequest(&filled_in_request_data, frame,
+                                          &web_request))
+    return PP_ERROR_FAILED;
+  web_request.setRequestorProcessID(renderer_ppapi_host_->GetPluginPID());
+
+  WebURLLoaderOptions options;
+  if (has_universal_access_) {
+    options.allowCredentials = true;
+    options.crossOriginRequestPolicy =
+        WebURLLoaderOptions::CrossOriginRequestPolicyAllow;
+  } else {
+    // All other HTTP requests are untrusted.
+    options.untrustedHTTP = true;
+    if (filled_in_request_data.allow_cross_origin_requests) {
+      // Allow cross-origin requests with access control. The request specifies
+      // if credentials are to be sent.
+      options.allowCredentials = filled_in_request_data.allow_credentials;
+      options.crossOriginRequestPolicy =
+          WebURLLoaderOptions::CrossOriginRequestPolicyUseAccessControl;
+    } else {
+      // Same-origin requests can always send credentials.
+      options.allowCredentials = true;
+    }
+  }
+
+  loader_.reset(frame->createAssociatedURLLoader(options));
+  if (!loader_.get())
+    return PP_ERROR_FAILED;
+
+  // Don't actually save the request until we know we're going to load.
+  request_data_ = filled_in_request_data;
+  loader_->loadAsynchronously(web_request, this);
+
+  // Although the request is technically pending, this is not a "Call" message
+  // so we don't return COMPLETIONPENDING.
+  return PP_OK;
+}
+
+int32_t PepperURLLoaderHost::OnHostMsgSetDeferLoading(
+    ppapi::host::HostMessageContext* context,
+    bool defers_loading) {
+  SetDefersLoading(defers_loading);
+  return PP_OK;
+}
+
+int32_t PepperURLLoaderHost::OnHostMsgClose(
+    ppapi::host::HostMessageContext* context) {
+  Close();
+  return PP_OK;
+}
+
+int32_t PepperURLLoaderHost::OnHostMsgGrantUniversalAccess(
+    ppapi::host::HostMessageContext* context) {
+  // Only plugins with private permission can bypass same origin.
+  if (!host()->permissions().HasPermission(ppapi::PERMISSION_PRIVATE))
+    return PP_ERROR_FAILED;
+  has_universal_access_ = true;
+  return PP_OK;
+}
+
+void PepperURLLoaderHost::SendUpdateToPlugin(IPC::Message* msg) {
+  if (pp_resource()) {
+    host()->SendUnsolicitedReply(pp_resource(), *msg);
+    delete msg;
+  } else {
+    pending_replies_.push_back(msg);
+  }
+}
+
+void PepperURLLoaderHost::Close() {
+  if (loader_.get())
+    loader_->cancel();
+  else if (main_document_loader_)
+    GetFrame()->stopLoading();
+}
+
+WebKit::WebFrame* PepperURLLoaderHost::GetFrame() {
+  webkit::ppapi::PluginInstance* instance_object =
+      renderer_ppapi_host_->GetPluginInstance(pp_instance());
+  if (!instance_object)
+    return NULL;
+  return instance_object->container()->element().document().frame();
+}
+
+void PepperURLLoaderHost::SetDefersLoading(bool defers_loading) {
+  if (loader_.get())
+    loader_->setDefersLoading(defers_loading);
+
+  // TODO(brettw) bug 96770: We need a way to set the defers loading flag on
+  // main document loads (when the loader_ is null).
+}
+
+void PepperURLLoaderHost::SaveResponse(const WebURLResponse& response) {
+  if (!main_document_loader_) {
+    // When we're the main document loader, we send the response data up front,
+    // so we don't want to trigger any callbacks in the plugin which aren't
+    // expected. We should not be getting redirects so the response sent
+    // up-front should be valid (plugin document loads happen after all
+    // redirects are processed since WebKit has to know the MIME type).
+    SendUpdateToPlugin(
+        new PpapiPluginMsg_URLLoader_ReceivedResponse(
+            webkit::ppapi::DataFromWebURLResponse(pp_instance(), response)));
+  }
+}
+
+void PepperURLLoaderHost::UpdateProgress() {
+  bool record_download = request_data_.record_download_progress;
+  bool record_upload = request_data_.record_upload_progress;
+  if (record_download || record_upload) {
+    // Here we go through some effort to only send the exact information that
+    // the requestor wanted in the request flags. It would be just as
+    // efficient to send all of it, but we don't want people to rely on
+    // getting download progress when they happen to set the upload progress
+    // flag.
+    ppapi::proxy::ResourceMessageReplyParams params;
+    SendUpdateToPlugin(new PpapiPluginMsg_URLLoader_UpdateProgress(
+            record_upload ? bytes_sent_ : -1,
+            record_upload ? total_bytes_to_be_sent_ : -1,
+            record_download ? bytes_received_ : -1,
+            record_download ? total_bytes_to_be_received_ : -1));
+  }
+}
+
+}  // namespace content