Make CertVerifier a pure virtual interface.

net/base/single_request_cert_verifier.cc

Index: net/base/single_request_cert_verifier.cc
diff --git a/net/base/single_request_cert_verifier.cc b/net/base/single_request_cert_verifier.cc
new file mode 100644
index 0000000000000000000000000000000000000000..60f9f1c8be0a87131e849cf58a4960c22d28e343
--- /dev/null
+++ b/net/base/single_request_cert_verifier.cc
@@ -0,0 +1,74 @@
+// 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 "net/base/single_request_cert_verifier.h"
+
+#include "base/bind.h"
+#include "base/bind_helpers.h"
+#include "net/base/net_errors.h"
+#include "net/base/x509_certificate.h"
+
+namespace net {
+
+SingleRequestCertVerifier::SingleRequestCertVerifier(
+    CertVerifier* cert_verifier)
+    : cert_verifier_(cert_verifier),
+      cur_request_(NULL) {
+  DCHECK(cert_verifier_ != NULL);
+}
+
+SingleRequestCertVerifier::~SingleRequestCertVerifier() {
+  if (cur_request_) {
+    cert_verifier_->CancelRequest(cur_request_);
+    cur_request_ = NULL;
+  }
+}
+
+int SingleRequestCertVerifier::Verify(X509Certificate* cert,
+                                      const std::string& hostname,
+                                      int flags,
+                                      CRLSet* crl_set,
+                                      CertVerifyResult* verify_result,
+                                      const CompletionCallback& callback,
+                                      const BoundNetLog& net_log) {
+  // Should not be already in use.
+  DCHECK(!cur_request_ && cur_request_callback_.is_null());
+
+  // Do a synchronous verification.
+  if (callback.is_null())
+    return cert->Verify(hostname, flags, crl_set, verify_result);
+
+  CertVerifier::RequestHandle request = NULL;
+
+  // We need to be notified of completion before |callback| is called, so that
+  // we can clear out |cur_request_*|.
+  int rv = cert_verifier_->Verify(
+      cert, hostname, flags, crl_set, verify_result,
+      base::Bind(&SingleRequestCertVerifier::OnVerifyCompletion,
+                 base::Unretained(this)),
+      &request, net_log);
+
+  if (rv == ERR_IO_PENDING) {
+    // Cleared in OnVerifyCompletion().
+    cur_request_ = request;
+    cur_request_callback_ = callback;
+  }
+
+  return rv;
+}
+
+void SingleRequestCertVerifier::OnVerifyCompletion(int result) {
+  DCHECK(cur_request_ && !cur_request_callback_.is_null());
+
+  CompletionCallback callback = cur_request_callback_;
+
+  // Clear the outstanding request information.
+  cur_request_ = NULL;
+  cur_request_callback_.Reset();
+
+  // Call the user's original callback.
+  callback.Run(result);
+}
+
+}  // namespace net