Delete the temporary file when generating MHTML with the extension API.

chrome/browser/extensions/extension_save_page_api.cc

Index: chrome/browser/extensions/extension_save_page_api.cc
diff --git a/chrome/browser/extensions/extension_save_page_api.cc b/chrome/browser/extensions/extension_save_page_api.cc
index 2a934b2b73924af140285b7f9d857d5dc6f3d111..fea54e7c22ae5014e0bb46e2d457a395f9dd1d63 100644
--- a/chrome/browser/extensions/extension_save_page_api.cc
+++ b/chrome/browser/extensions/extension_save_page_api.cc
@@ -8,6 +8,7 @@
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/extensions/extension_tab_util.h"
 #include "chrome/browser/ui/tab_contents/tab_contents_wrapper.h"
+#include "chrome/common/extensions/extension_messages.h"
 #include "content/browser/child_process_security_policy.h"
 #include "content/browser/renderer_host/render_view_host.h"
 #include "content/browser/tab_contents/tab_contents.h"
@@ -26,12 +27,18 @@ const char* const kSizeRetrievalError =
 const char* const kTemporaryFileError = "Failed to create a temporary file.";
 const char* const kTabClosedError = "Cannot find the tab for thie request.";
 
+static SavePageAsMHTMLFunction::TestDelegate* test_delegate_ = NULL;
+
 SavePageAsMHTMLFunction::SavePageAsMHTMLFunction() : tab_id_(0) {
 }
 
 SavePageAsMHTMLFunction::~SavePageAsMHTMLFunction() {
 }
 
+void SavePageAsMHTMLFunction::SetTestDelegate(TestDelegate* delegate) {
+  test_delegate_ = delegate;
+}
+
 bool SavePageAsMHTMLFunction::RunImpl() {
   EXTENSION_FUNCTION_VALIDATE(args_->GetInteger(0, &tab_id_));
 
@@ -42,11 +49,30 @@ bool SavePageAsMHTMLFunction::RunImpl() {
   return true;
 }
 
+bool SavePageAsMHTMLFunction::OnMessageReceivedFromRenderView(
+    const IPC::Message& message) {
+  if (message.type() != ExtensionHostMsg_ResponseAck::ID)
+    return false;
+
+  int message_request_id;
+  void* iter = NULL;
+  if (!message.ReadInt(&iter, &message_request_id)) {
+    NOTREACHED() << "malformed extension message";
+    return true;
+  }
+
+  if (message_request_id != request_id())
+    return false;
+
+  // The extension process has processed the response and has created a
+  // reference to the blob, it is safe for us to go away.
+  Release();  // Balanced in Run()
+
+  return true;
+}
+
 void SavePageAsMHTMLFunction::CreateTemporaryFile() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
-  // TODO(jcivelli): http://crbug.com/97489 we don't clean-up the temporary file
-  //                 at this point.  It must be done before we can take that API
-  //                 out of experimental.
   bool success = file_util::CreateTemporaryFile(&mhtml_path_);
   BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
       NewRunnableMethod(this, &SavePageAsMHTMLFunction::TemporaryFileCreated,
@@ -59,16 +85,20 @@ void SavePageAsMHTMLFunction::TemporaryFileCreated(bool success) {
     return;
   }
 
-  Browser* browser = NULL;
-  TabContentsWrapper* tab_contents_wrapper = NULL;
+  if (test_delegate_)
+    test_delegate_->OnTemporaryFileCreated(mhtml_path_);
 
-  if (!ExtensionTabUtil::GetTabById(tab_id_, profile(), include_incognito(),
-      &browser, NULL, &tab_contents_wrapper, NULL)) {
+  // Sets a DeletableFileReference so the temporary file gets deleted once it is
+  // no longer used.
+  mhtml_file_ = webkit_blob::DeletableFileReference::GetOrCreate(mhtml_path_,
+      BrowserThread::GetMessageLoopProxyForThread(BrowserThread::FILE));
+
+  TabContents* tab_contents = GetTabContents();
+  if (!tab_contents) {
     ReturnFailure(kTabClosedError);
     return;
   }
 
-  TabContents* tab_contents = tab_contents_wrapper->tab_contents();
   registrar_.Add(
       this, content::NOTIFICATION_MHTML_GENERATED,
       content::Source<RenderViewHost>(tab_contents->render_view_host()));
@@ -124,6 +154,12 @@ void SavePageAsMHTMLFunction::ReturnFailure(const std::string& error) {
 void SavePageAsMHTMLFunction::ReturnSuccess(int64 file_size) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
+  TabContents* tab_contents = GetTabContents();
+  if (!tab_contents || !render_view_host()) {
+    ReturnFailure(kTabClosedError);
+    return;
+  }
+
   int child_id = render_view_host()->process()->GetID();
   ChildProcessSecurityPolicy::GetInstance()->GrantReadFile(
       child_id, mhtml_path_);
@@ -135,5 +171,18 @@ void SavePageAsMHTMLFunction::ReturnSuccess(int64 file_size) {
 
   SendResponse(true);
 
-  Release();  // Balanced in Run()
+  // Note that we'll wait for a response ack message received in
+  // OnMessageReceivedFromRenderView before we call Release() (to prevent the
+  // blob file from being deleted).
+}
+
+TabContents* SavePageAsMHTMLFunction::GetTabContents() {
+  Browser* browser = NULL;
+  TabContentsWrapper* tab_contents_wrapper = NULL;
+
+  if (!ExtensionTabUtil::GetTabById(tab_id_, profile(), include_incognito(),
+      &browser, NULL, &tab_contents_wrapper, NULL)) {
+    return NULL;
+  }
+  return tab_contents_wrapper->tab_contents();
 }