content/public/common/referrer.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/command_line.h"
   6 #include "content/public/common/content_switches.h"
   7 #include "content/public/common/referrer.h"
   8
   9 namespace content {
  10
  11 // static.
  12 Referrer Referrer::SanitizeForRequest(const GURL& request,
  13                                       const Referrer& referrer) {
  14   Referrer sanitized_referrer(referrer.url.GetAsReferrer(), referrer.policy);
  15
  16   if (!request.SchemeIsHTTPOrHTTPS() ||
  17       !sanitized_referrer.url.SchemeIsHTTPOrHTTPS()) {
  18     sanitized_referrer.url = GURL();
  19     return sanitized_referrer;
  20   }
  21
  22   bool is_downgrade =
  23       sanitized_referrer.url.SchemeIsSecure() && !request.SchemeIsSecure();
  24
  25   switch (sanitized_referrer.policy) {
  26     case blink::WebReferrerPolicyDefault:
  27       if (is_downgrade) {
  28         sanitized_referrer.url = GURL();
  29       } else if (request.GetOrigin() != sanitized_referrer.url.GetOrigin() &&
  30                  base::CommandLine::ForCurrentProcess()->HasSwitch(
  31                      switches::kReducedReferrerGranularity)) {
  32         sanitized_referrer.url = sanitized_referrer.url.GetOrigin();
  33       }
  34       break;
  35     case blink::WebReferrerPolicyNoReferrerWhenDowngrade:
  36       if (is_downgrade)
  37         sanitized_referrer.url = GURL();
  38       break;
  39     case blink::WebReferrerPolicyAlways:
  40       break;
  41     case blink::WebReferrerPolicyNever:
  42       sanitized_referrer.url = GURL();
  43       break;
  44     case blink::WebReferrerPolicyOrigin:
  45       sanitized_referrer.url = sanitized_referrer.url.GetOrigin();
  46       break;
  47     default:
  48       NOTREACHED();
  49       break;
  50   }
  51   return sanitized_referrer;
  52 }
  53
  54 }  // namespace content