FIXUP: Implement HTTPS state

Add missing https_state.cc and https_state.h.
This amends commit:
e6c8000fcf [Backport] Fix for security issue 880023 (2/2)

Change-Id: I810334ed6ec8e8ba2c43992f26a7c9de1c1706a1
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>

2 files changed, 57 insertions, 0 deletions

diff --git a/chromium/third_party/blink/renderer/platform/loader/fetch/https_state.cc b/chromium/third_party/blink/renderer/platform/loader/fetch/https_state.cc
new file mode 100644
index 00000000000..98b50a6d6cd
--- /dev/null
+++ b/chromium/third_party/blink/renderer/platform/loader/fetch/https_state.cc
@@ -0,0 +1,22 @@
+// Copyright 2018 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 "third_party/blink/renderer/platform/loader/fetch/https_state.h"
+
+#include "third_party/blink/renderer/platform/weborigin/security_origin.h"
+
+namespace blink {
+
+HttpsState CalculateHttpsState(const SecurityOrigin* security_origin,
+                               base::Optional<HttpsState> parent_https_state) {
+  if (security_origin && security_origin->Protocol() == "https")
+    return HttpsState::kModern;
+
+  if (parent_https_state && *parent_https_state != HttpsState::kNone)
+    return *parent_https_state;
+
+  return HttpsState::kNone;
+}
+
+}  // namespace blink
diff --git a/chromium/third_party/blink/renderer/platform/loader/fetch/https_state.h b/chromium/third_party/blink/renderer/platform/loader/fetch/https_state.h
new file mode 100644
index 00000000000..77023b88d9e
--- /dev/null
+++ b/chromium/third_party/blink/renderer/platform/loader/fetch/https_state.h
@@ -0,0 +1,35 @@
+// Copyright 2018 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 THIRD_PARTY_BLINK_RENDERER_PLATFORM_LOADER_FETCH_HTTPS_STATE_H_
+#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_LOADER_FETCH_HTTPS_STATE_H_
+
+#include "base/optional.h"
+#include "third_party/blink/renderer/platform/platform_export.h"
+
+namespace blink {
+
+class SecurityOrigin;
+
+// https://fetch.spec.whatwg.org/#concept-https-state-value
+enum class HttpsState {
+  kNone,
+  // kDeprecated is not used.
+  kModern
+};
+
+// According to the Fetch spec, HTTPS state is set during fetch, e.g. to
+// modern for https: or to request's client's HTTPS state for data:.
+// In the Blink implementation however, HTTPS state is calculated from
+// response URL's SecurityOrigin and optional |parent_https_state| (that
+// represents request's client's HTTPS state) to emulate this behavior.
+// TODO(https://crbug.com/880986): Implement HTTPS state in more
+// spec-conformant way.
+PLATFORM_EXPORT HttpsState CalculateHttpsState(
+    const SecurityOrigin*,
+    base::Optional<HttpsState> parent_https_state = base::nullopt);
+
+}  // namespace blink
+
+#endif  // THIRD_PARTY_BLINK_RENDERER_PLATFORM_LOADER_FETCH_HTTPS_STATE_H_