1 files changed, 66 insertions, 0 deletions
diff --git a/chromium/chrome/common/client_hints/client_hints.cc b/chromium/chrome/common/client_hints/client_hints.cc
new file mode 100644
index 00000000000..4c27309acae
--- /dev/null
+++ b/chromium/chrome/common/client_hints/client_hints.cc
@@ -0,0 +1,66 @@
+// Copyright 2017 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 "chrome/common/client_hints/client_hints.h"
+
+#include "content/public/common/origin_util.h"
+#include "third_party/blink/public/platform/web_client_hints_type.h"
+#include "url/gurl.h"
+
+namespace client_hints {
+
+void GetAllowedClientHintsFromSource(
+    const GURL& url,
+    const ContentSettingsForOneType& client_hints_rules,
+    blink::WebEnabledClientHints* client_hints) {
+  if (client_hints_rules.empty())
+    return;
+
+  if (!content::IsOriginSecure(url))
+    return;
+
+  const GURL& origin = url.GetOrigin();
+
+  for (const auto& rule : client_hints_rules) {
+    // Look for an exact match since persisted client hints are disabled by
+    // default, and enabled only on per-host basis.
+    if (rule.primary_pattern == ContentSettingsPattern::Wildcard() ||
+        !rule.primary_pattern.Matches(origin)) {
+      continue;
+    }
+
+    // Found an exact match.
+    DCHECK(ContentSettingsPattern::Wildcard() == rule.secondary_pattern);
+    DCHECK(rule.setting_value.is_dict());
+    const base::Value* expiration_time =
+        rule.setting_value.FindKey("expiration_time");
+
+    // |expiration_time| may be null in rare cases. See
+    // https://bugs.chromium.org/p/chromium/issues/detail?id=942398.
+    if (expiration_time == nullptr)
+      continue;
+    DCHECK(expiration_time->is_double());
+
+    if (base::Time::Now().ToDoubleT() > expiration_time->GetDouble()) {
+      // The client hint is expired.
+      return;
+    }
+
+    const base::Value* list_value = rule.setting_value.FindKey("client_hints");
+    if (list_value == nullptr)
+      continue;
+    DCHECK(list_value->is_list());
+    base::span<const base::Value> client_hints_list = list_value->GetList();
+    for (const auto& client_hint : client_hints_list) {
+      DCHECK(client_hint.is_int());
+      client_hints->SetIsEnabled(
+          static_cast<blink::mojom::WebClientHintsType>(client_hint.GetInt()),
+          true);
+    }
+    // Match found for |url| and client hints have been set.
+    return;
+  }
+}
+
+}  // namespace client_hints