Un-refcount SSLClientAuthHandler.

content/browser/ssl/ssl_client_auth_handler.h

 // 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.
 
 #ifndef CONTENT_BROWSER_SSL_SSL_CLIENT_AUTH_HANDLER_H_
 #define CONTENT_BROWSER_SSL_SSL_CLIENT_AUTH_HANDLER_H_
 
 #include "base/basictypes.h"
+#include "base/callback.h"
 #include "base/memory/ref_counted.h"
-#include "base/sequenced_task_runner_helpers.h"
-#include "content/common/content_export.h"
+#include "base/memory/weak_ptr.h"
 #include "content/public/browser/browser_thread.h"
 #include "net/ssl/ssl_cert_request_info.h"
 
 namespace net {
 class ClientCertStore;
-class HttpNetworkSession;
 class URLRequest;
 class X509Certificate;
 }  // namespace net
 
 namespace content {
 
-class ResourceContext;
-
 // This class handles the approval and selection of a certificate for SSL client
-// authentication by the user.
-// It is self-owned and deletes itself when the UI reports the user selection or
-// when the net::URLRequest is cancelled.
-class CONTENT_EXPORT SSLClientAuthHandler
-    : public base::RefCountedThreadSafe<
-          SSLClientAuthHandler, BrowserThread::DeleteOnIOThread> {
+// authentication by the user. Should only be used on the IO thread. If the
+// SSLClientAuthHandler is destroyed before the certificate is selected, the
+// selection is canceled and the callback never called.
+class SSLClientAuthHandler {
  public:
   using CertificateCallback = base::Callback<void(net::X509Certificate*)>;
 
   SSLClientAuthHandler(scoped_ptr<net::ClientCertStore> client_cert_store,
                        net::URLRequest* request,
                        net::SSLCertRequestInfo* cert_request_info,
                        const CertificateCallback& callback);
+  ~SSLClientAuthHandler();
 
   // Selects a certificate and resumes the URL request with that certificate.
-  // Should only be called on the IO thread.
   void SelectCertificate();
 
-  // Invoked when the request associated with this handler is cancelled.
-  // Should only be called on the IO thread.
-  void OnRequestCancelled();
+ private:
+  class Core;
 
-  // Calls DoCertificateSelected on the I/O thread.
-  // Called on the UI thread after the user has made a selection (which may
-  // be long after DoSelectCertificate returns, if the UI is modeless/async.)
+  // Called when |core_| is done retrieving the cert list.
+  void DidGetClientCerts();
+
+  // Called when the user has selected a cert.

[pneubeck (no reviews), 2014/12/14 16:45:13]

wouldn't |cert| be null if the selection was aborted?

[davidben, 2015/01/23 21:05:35]

We actually don't ever plumb through aborting a selection (a bug I need to fix
crbug.com/417092). Pressing cancel explicitly selects no certificate, which is a
different operation. Added a note in the comment.

   void CertificateSelected(net::X509Certificate* cert);
 
- protected:
-  virtual ~SSLClientAuthHandler();
-
- private:
-  friend class base::RefCountedThreadSafe<
-      SSLClientAuthHandler, BrowserThread::DeleteOnIOThread>;
-  friend class BrowserThread;
-  friend class base::DeleteHelper<SSLClientAuthHandler>;
-
-  // Called when ClientCertStore is done retrieving the cert list.
-  void DidGetClientCerts();
-
-  // Notifies that the user has selected a cert.
-  // Called on the IO thread.
-  void DoCertificateSelected(net::X509Certificate* cert);
-
-  // Selects a client certificate on the UI thread.
-  void DoSelectCertificate(int render_process_host_id,
-                           int render_frame_host_id);
+  // A reference-counted core so the ClientCertStore may outlive
+  // SSLClientAuthHandler if the handler is destroyed while an operation on the
+  // ClientCertStore is in progress.
+  scoped_refptr<Core> core_;
 
   // The net::URLRequest that triggered this client auth.
   net::URLRequest* request_;
 
   // The certs to choose from.
   scoped_refptr<net::SSLCertRequestInfo> cert_request_info_;
 
-  scoped_ptr<net::ClientCertStore> client_cert_store_;
-
   // The callback to call when the certificate is selected.
   CertificateCallback callback_;
 
+  base::WeakPtrFactory<SSLClientAuthHandler> weak_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(SSLClientAuthHandler);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SSL_SSL_CLIENT_AUTH_HANDLER_H_