ios/web/public/referrer_util.cc

   1 // Copyright 2013 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 "ios/web/public/referrer_util.h"
   6
   7 #include "base/logging.h"
   8 #include "ios/web/public/referrer.h"
   9 #include "url/gurl.h"
  10
  11 namespace web {
  12
  13 GURL ReferrerForHeader(const GURL& referrer) {
  14   DCHECK(referrer.is_valid());
  15   GURL::Replacements replacements;
  16   replacements.ClearUsername();
  17   replacements.ClearPassword();
  18   replacements.ClearRef();
  19   return referrer.ReplaceComponents(replacements);
  20 }
  21
  22 std::string ReferrerHeaderValueForNavigation(
  23     const GURL& destination,
  24     const web::Referrer& referrer) {
  25   std::string referrer_value;
  26   bool leaving_secure_scheme = referrer.url.SchemeIsCryptographic() &&
  27                                !destination.SchemeIsCryptographic();
  28   if (referrer.policy == ReferrerPolicyAlways ||
  29       (referrer.policy == ReferrerPolicyDefault && !leaving_secure_scheme)) {
  30     if (referrer.url.is_valid())
  31       referrer_value = ReferrerForHeader(referrer.url).spec();
  32   } else if (referrer.policy == ReferrerPolicyOrigin) {
  33     referrer_value = referrer.url.GetOrigin().spec();
  34   } else {
  35     // Policy is Never, or it's Default with a secure->insecure transition, so
  36     // leave it empty.
  37   }
  38   return referrer_value;
  39 }
  40
  41 net::URLRequest::ReferrerPolicy PolicyForNavigation(
  42     const GURL& destination,
  43     const web::Referrer& referrer) {
  44   net::URLRequest::ReferrerPolicy net_referrer_policy =
  45       net::URLRequest::CLEAR_REFERRER_ON_TRANSITION_FROM_SECURE_TO_INSECURE;
  46   if (referrer.url.is_valid()) {
  47     GURL referrer_url(ReferrerHeaderValueForNavigation(destination, referrer));
  48     if (!referrer_url.is_empty()) {
  49       switch (referrer.policy) {
  50         case ReferrerPolicyDefault:
  51           break;
  52         case ReferrerPolicyAlways:
  53         case ReferrerPolicyNever:
  54         case ReferrerPolicyOrigin:
  55           net_referrer_policy = net::URLRequest::NEVER_CLEAR_REFERRER;
  56           break;
  57         default:
  58           NOTREACHED();
  59       }
  60     }
  61   }
  62   return net_referrer_policy;
  63 }
  64
  65 ReferrerPolicy ReferrerPolicyFromString(const std::string& policy) {
  66   if (policy == "never")
  67     return ReferrerPolicyNever;
  68   if (policy == "always")
  69     return ReferrerPolicyAlways;
  70   if (policy == "origin")
  71     return ReferrerPolicyOrigin;
  72   return web::ReferrerPolicyDefault;
  73 }
  74
  75 }  // namespace web