content/browser/service_worker/service_worker_utils.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 "content/browser/service_worker/service_worker_utils.h"
   6
   7 #include <string>
   8
   9 #include "base/logging.h"
  10 #include "base/strings/string_util.h"
  11
  12 namespace content {
  13
  14 namespace {
  15
  16 bool PathContainsDisallowedCharacter(const GURL& url) {
  17   std::string path = url.path();
  18   DCHECK(base::IsStringUTF8(path));
  19
  20   // We should avoid these escaped characters in the path component because
  21   // these can be handled differently depending on server implementation.
  22   if (path.find("%2f") != std::string::npos ||
  23       path.find("%2F") != std::string::npos) {
  24     return true;
  25   }
  26   if (path.find("%5c") != std::string::npos ||
  27       path.find("%5C") != std::string::npos) {
  28     return true;
  29   }
  30   return false;
  31 }
  32
  33 }  // namespace
  34
  35 // static
  36 bool ServiceWorkerUtils::ScopeMatches(const GURL& scope, const GURL& url) {
  37   DCHECK(!scope.has_ref());
  38   DCHECK(!url.has_ref());
  39   return base::StartsWithASCII(url.spec(), scope.spec(), true);
  40 }
  41
  42 // static
  43 bool ServiceWorkerUtils::IsPathRestrictionSatisfied(
  44     const GURL& scope,
  45     const GURL& script_url,
  46     const std::string* service_worker_allowed_header_value,
  47     std::string* error_message) {
  48   DCHECK(scope.is_valid());
  49   DCHECK(!scope.has_ref());
  50   DCHECK(script_url.is_valid());
  51   DCHECK(!script_url.has_ref());
  52   DCHECK(error_message);
  53
  54   if (ContainsDisallowedCharacter(scope, script_url, error_message))
  55     return false;
  56
  57   std::string max_scope_string;
  58   if (service_worker_allowed_header_value) {
  59     GURL max_scope = script_url.Resolve(*service_worker_allowed_header_value);
  60     if (!max_scope.is_valid()) {
  61       *error_message = "An invalid Service-Worker-Allowed header value ('";
  62       error_message->append(*service_worker_allowed_header_value);
  63       error_message->append("') was received when fetching the script.");
  64       return false;
  65     }
  66     max_scope_string = max_scope.path();
  67   } else {
  68     max_scope_string = script_url.Resolve(".").path();
  69   }
  70
  71   std::string scope_string = scope.path();
  72   if (!base::StartsWithASCII(scope_string, max_scope_string, true)) {
  73     *error_message = "The path of the provided scope ('";
  74     error_message->append(scope_string);
  75     error_message->append("') is not under the max scope allowed (");
  76     if (service_worker_allowed_header_value)
  77       error_message->append("set by Service-Worker-Allowed: ");
  78     error_message->append("'");
  79     error_message->append(max_scope_string);
  80     error_message->append(
  81         "'). Adjust the scope, move the Service Worker script, or use the "
  82         "Service-Worker-Allowed HTTP header to allow the scope.");
  83     return false;
  84   }
  85   return true;
  86 }
  87
  88 // static
  89 bool ServiceWorkerUtils::ContainsDisallowedCharacter(
  90     const GURL& scope,
  91     const GURL& script_url,
  92     std::string* error_message) {
  93   if (PathContainsDisallowedCharacter(scope) ||
  94       PathContainsDisallowedCharacter(script_url)) {
  95     *error_message = "The provided scope ('";
  96     error_message->append(scope.spec());
  97     error_message->append("') or scriptURL ('");
  98     error_message->append(script_url.spec());
  99     error_message->append("') includes a disallowed escape character.");
 100     return true;
 101   }
 102   return false;
 103 }
 104
 105 bool LongestScopeMatcher::MatchLongest(const GURL& scope) {
 106   if (!ServiceWorkerUtils::ScopeMatches(scope, url_))
 107     return false;
 108   if (match_.is_empty() || match_.spec().size() < scope.spec().size()) {
 109     match_ = scope;
 110     return true;
 111   }
 112   return false;
 113 }
 114
 115 }  // namespace content