Introducing a net::GenerateMimeMultipartBoundary helper.

content/browser/download/mhtml_generation_manager.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/browser/download/mhtml_generation_manager.h"
 
 #include <map>
 #include <queue>
 
 #include "base/bind.h"
 #include "base/files/file.h"
 #include "base/guid.h"
-#include "base/rand_util.h"
 #include "base/scoped_observer.h"
 #include "base/stl_util.h"
-#include "base/strings/string_number_conversions.h"
 #include "base/strings/stringprintf.h"
 #include "content/browser/frame_host/frame_tree_node.h"
 #include "content/common/frame_messages.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/render_process_host_observer.h"
 #include "content/public/browser/web_contents.h"
+#include "net/base/mime_util.h"
 
 namespace content {
 
 // The class and all of its members live on the UI thread.  Only static methods
 // are executed on other threads.
 class MHTMLGenerationManager::Job : public RenderProcessHostObserver {
  public:
   Job(int job_id, WebContents* web_contents, GenerateMHTMLCallback callback);
   ~Job() override;
 
@@ skipping 15 matching lines @@
   // file size.
   void CloseFile(base::Callback<void(int64 file_size)> callback);
 
   // RenderProcessHostObserver:
   void RenderProcessExited(RenderProcessHost* host,
                            base::TerminationStatus status,
                            int exit_code) override;
   void RenderProcessHostDestroyed(RenderProcessHost* host) override;
 
  private:
-  static std::string GenerateMHTMLBoundaryMarker();
   static int64 CloseFileOnFileThread(base::File file);
   void AddFrame(RenderFrameHost* render_frame_host);
 
   // Creates a new map with values (content ids) the same as in
   // |frame_tree_node_to_content_id_| map, but with the keys translated from
   // frame_tree_node_id into a |site_instance|-specific routing_id.
   std::map<int, std::string> CreateFrameRoutingIdToContentId(
       SiteInstance* site_instance);
 
   // Id used to map renderer responses to jobs.
@@ skipping 20 matching lines @@
   ScopedObserver<RenderProcessHost, MHTMLGenerationManager::Job>
       observed_renderer_process_host_;
 
   DISALLOW_COPY_AND_ASSIGN(Job);
 };
 
 MHTMLGenerationManager::Job::Job(int job_id,
                                  WebContents* web_contents,
                                  GenerateMHTMLCallback callback)
     : job_id_(job_id),
-      mhtml_boundary_marker_(GenerateMHTMLBoundaryMarker()),
+      mhtml_boundary_marker_(net::GenerateMimeMultipartBoundary()),
       callback_(callback),
       observed_renderer_process_host_(this) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   web_contents->ForEachFrame(base::Bind(
       &MHTMLGenerationManager::Job::AddFrame,
       base::Unretained(this)));  // Safe because ForEachFrame is synchronous.
 
   // Main frame needs to be processed first.
   DCHECK(!pending_frame_tree_node_ids_.empty());
   DCHECK(FrameTreeNode::GloballyFindByID(pending_frame_tree_node_ids_.front())
@@ skipping 95 matching lines @@
 
 // static
 int64 MHTMLGenerationManager::Job::CloseFileOnFileThread(base::File file) {
   DCHECK_CURRENTLY_ON(BrowserThread::FILE);
   DCHECK(file.IsValid());
   int64 file_size = file.GetLength();
   file.Close();
   return file_size;
 }
 
-// static
-std::string MHTMLGenerationManager::Job::GenerateMHTMLBoundaryMarker() {
-  // TODO(lukasza): Introduce and use a shared helper function in
-  // net/base/mime_util.h instead of having the ad-hoc code below.
-
-  // Trying to generate random boundaries similar to IE/UnMHT
-  // (ex: ----=_NextPart_000_001B_01CC157B.96F808A0).
-  uint8_t random_values[10];
-  base::RandBytes(&random_values, sizeof(random_values));
-
-  std::string result("----=_NextPart_000_");
-  result += base::HexEncode(random_values + 0, 2);
-  result += '_';
-  result += base::HexEncode(random_values + 2, 4);
-  result += '.';
-  result += base::HexEncode(random_values + 6, 4);
-  return result;
-}
-
 MHTMLGenerationManager* MHTMLGenerationManager::GetInstance() {
   return base::Singleton<MHTMLGenerationManager>::get();
 }
 
 MHTMLGenerationManager::MHTMLGenerationManager() : next_job_id_(0) {}
 
 MHTMLGenerationManager::~MHTMLGenerationManager() {
   STLDeleteValues(&id_to_job_);
 }
 
@@ skipping 132 matching lines @@
        ++it) {
     if (it->second == job) {
       JobFinished(it->first, JobStatus::FAILURE);
       return;
     }
   }
   NOTREACHED();
 }
 
 }  // namespace content