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      1 // Copyright (c) 2011 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 "chrome/browser/extensions/external_policy_extension_loader.h"
      6 
      7 #include "base/logging.h"
      8 #include "base/values.h"
      9 #include "chrome/browser/prefs/pref_service.h"
     10 #include "chrome/browser/profiles/profile.h"
     11 #include "chrome/common/extensions/extension.h"
     12 #include "chrome/common/pref_names.h"
     13 #include "content/browser/browser_thread.h"
     14 #include "content/common/notification_service.h"
     15 #include "content/common/notification_type.h"
     16 #include "googleurl/src/gurl.h"
     17 
     18 namespace {
     19 
     20 // Check an extension ID and an URL to be syntactically correct.
     21 bool CheckExtension(const std::string& id, const std::string& update_url) {
     22   GURL url(update_url);
     23   if (!url.is_valid()) {
     24     LOG(WARNING) << "Policy specifies invalid update URL for external "
     25                  << "extension: " << update_url;
     26     return false;
     27   }
     28   if (!Extension::IdIsValid(id)) {
     29     LOG(WARNING) << "Policy specifies invalid ID for external "
     30                  << "extension: " << id;
     31     return false;
     32   }
     33   return true;
     34 }
     35 
     36 }  // namespace
     37 
     38 ExternalPolicyExtensionLoader::ExternalPolicyExtensionLoader(
     39     Profile* profile)
     40     : profile_(profile) {
     41   pref_change_registrar_.Init(profile_->GetPrefs());
     42   pref_change_registrar_.Add(prefs::kExtensionInstallForceList, this);
     43   notification_registrar_.Add(this,
     44                               NotificationType::PROFILE_DESTROYED,
     45                               Source<Profile>(profile_));
     46 }
     47 
     48 void ExternalPolicyExtensionLoader::StartLoading() {
     49   const ListValue* forcelist =
     50       profile_->GetPrefs()->GetList(prefs::kExtensionInstallForceList);
     51   DictionaryValue* result = new DictionaryValue();
     52   if (forcelist != NULL) {
     53     std::string extension_desc;
     54     for (ListValue::const_iterator it = forcelist->begin();
     55          it != forcelist->end(); ++it) {
     56       if (!(*it)->GetAsString(&extension_desc)) {
     57         LOG(WARNING) << "Failed to read forcelist string.";
     58       } else {
     59         // Each string item of the list has the following form:
     60         // extension_id_code;extension_update_url
     61         // The update URL might also contain semicolons.
     62         size_t pos = extension_desc.find(';');
     63         std::string id = extension_desc.substr(0, pos);
     64         std::string update_url = extension_desc.substr(pos+1);
     65         if (CheckExtension(id, update_url)) {
     66           result->SetString(id + ".external_update_url", update_url);
     67         }
     68       }
     69     }
     70   }
     71   prefs_.reset(result);
     72   LoadFinished();
     73 }
     74 
     75 void ExternalPolicyExtensionLoader::Observe(
     76     NotificationType type,
     77     const NotificationSource& source,
     78     const NotificationDetails& details) {
     79   if (profile_ == NULL) return;
     80   switch (type.value) {
     81     case NotificationType::PREF_CHANGED: {
     82       if (Source<PrefService>(source).ptr() == profile_->GetPrefs()) {
     83         std::string* pref_name = Details<std::string>(details).ptr();
     84         if (*pref_name == prefs::kExtensionInstallForceList) {
     85           StartLoading();
     86         } else {
     87           NOTREACHED() << "Unexpected preference name.";
     88         }
     89       }
     90       break;
     91     }
     92     case NotificationType::PROFILE_DESTROYED: {
     93       if (Source<Profile>(source).ptr() == profile_) {
     94         notification_registrar_.RemoveAll();
     95         pref_change_registrar_.RemoveAll();
     96         profile_ = NULL;
     97       }
     98       break;
     99     }
    100     default:
    101       NOTREACHED() << "Unexpected notification type.";
    102   }
    103 }
    104