fake attestation flow

The introduced new class is meant to replace the current fake objects
used in various browser tests.

BUG=b:158955123

Change-Id: I743bd605321e7f384eb22a9ecac4fb40ae93e980
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2297062
Commit-Queue: Leo Lai <cylai@google.com>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789383}

chromeos/attestation/BUILD.gn

@@ -35,10 +35,13 @@ source_set("test_support") {
   deps = [
     "//base/test:test_support",
     "//chromeos/dbus/attestation:attestation_proto",
+    "//chromeos/dbus/constants:constants",
     "//components/account_id",
     "//testing/gmock",
   ]
   sources = [
+    "fake_attestation_flow.cc",
+    "fake_attestation_flow.h",
     "mock_attestation_flow.cc",
     "mock_attestation_flow.h",
   ]

chromeos/attestation/fake_attestation_flow.cc

+// Copyright 2020 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 "chromeos/attestation/fake_attestation_flow.h"
+
+#include <string>
+#include <utility>
+
+#include "base/bind.h"
+#include "base/threading/thread_task_runner_handle.h"
+#include "chromeos/dbus/constants/attestation_constants.h"
+#include "components/account_id/account_id.h"
+
+namespace chromeos {
+namespace attestation {
+
+namespace {
+
+constexpr char kFakeCert[] = "cert";
+
+}  // namespace
+
+// This constructor passes |nullptr|s to the base class
+// |AttestationFlow| because we don't use cryptohome client and server
+// proxy in |AttestationFlowIntegrated|.
+//
+// TOOD(b/158955123): Remove this transitional state along with the removal of
+// |AttestationFlow|.
+FakeAttestationFlow::FakeAttestationFlow()
+    : AttestationFlow(nullptr, nullptr, nullptr) {}
+
+FakeAttestationFlow::~FakeAttestationFlow() = default;
+
+void FakeAttestationFlow::GetCertificate(
+    AttestationCertificateProfile /*certificate_profile*/,
+    const AccountId& /*account_id*/,
+    const std::string& /*request_origin*/,
+    bool /*force_new_key*/,
+    const std::string& /*key_name*/,
+    CertificateCallback callback) {
+  base::ThreadTaskRunnerHandle::Get()->PostTask(
+      FROM_HERE,
+      base::BindOnce(std::move(callback),
+                     AttestationStatus::ATTESTATION_SUCCESS, kFakeCert));
+}
+
+}  // namespace attestation
+}  // namespace chromeos

chromeos/attestation/fake_attestation_flow.h

+// Copyright 2020 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 CHROMEOS_ATTESTATION_FAKE_ATTESTATION_FLOW_H_
+#define CHROMEOS_ATTESTATION_FAKE_ATTESTATION_FLOW_H_
+
+#include <string>
+
+#include "chromeos/attestation/attestation_flow.h"
+
+class AccountId;
+
+namespace chromeos {
+namespace attestation {
+
+// This fake class always returns a fake certificate.
+class FakeAttestationFlow : public AttestationFlow {
+ public:
+  FakeAttestationFlow();
+  ~FakeAttestationFlow() override;
+
+  void GetCertificate(AttestationCertificateProfile certificate_profile,
+                      const AccountId& account_id,
+                      const std::string& request_origin,
+                      bool force_new_key,
+                      const std::string& key_name,
+                      CertificateCallback callback) override;
+};
+
+}  // namespace attestation
+}  // namespace chromeos
+
+#endif  // CHROMEOS_ATTESTATION_FAKE_ATTESTATION_FLOW_H_