src/chrome/browser/extensions/api/permissions/permissions_api_helpers.cc

   1 // Copyright (c) 2012 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/api/permissions/permissions_api_helpers.h"
   6
   7 #include "base/json/json_reader.h"
   8 #include "base/json/json_writer.h"
   9 #include "base/values.h"
  10 #include "chrome/common/extensions/api/permissions.h"
  11 #include "chrome/common/extensions/permissions/usb_device_permission.h"
  12 #include "extensions/common/error_utils.h"
  13 #include "extensions/common/extension.h"
  14 #include "extensions/common/permissions/permission_set.h"
  15 #include "extensions/common/permissions/permissions_info.h"
  16 #include "extensions/common/url_pattern_set.h"
  17
  18 using extensions::APIPermission;
  19 using extensions::PermissionSet;
  20 using extensions::PermissionsInfo;
  21
  22 namespace extensions {
  23
  24 using api::permissions::Permissions;
  25
  26 namespace permissions_api_helpers {
  27
  28 namespace {
  29
  30 const char kDelimiter[] = "|";
  31 const char kInvalidParameter[] =
  32     "Invalid argument for permission '*'.";
  33 const char kInvalidOrigin[] =
  34     "Invalid value for origin pattern *: *";
  35 const char kUnknownPermissionError[] =
  36     "'*' is not a recognized permission.";
  37 const char kUnsupportedPermissionId[] =
  38     "Only the usbDevices permission supports arguments.";
  39
  40 }  // namespace
  41
  42 scoped_ptr<Permissions> PackPermissionSet(const PermissionSet* set) {
  43   Permissions* permissions(new Permissions());
  44
  45   permissions->permissions.reset(new std::vector<std::string>());
  46   for (APIPermissionSet::const_iterator i = set->apis().begin();
  47        i != set->apis().end(); ++i) {
  48     scoped_ptr<base::Value> value(i->ToValue());
  49     if (!value) {
  50       permissions->permissions->push_back(i->name());
  51     } else {
  52       std::string name(i->name());
  53       std::string json;
  54       base::JSONWriter::Write(value.get(), &json);
  55       permissions->permissions->push_back(name + kDelimiter + json);
  56     }
  57   }
  58
  59   // TODO(rpaquay): We currently don't expose manifest permissions
  60   // to apps/extensions via the permissions API.
  61
  62   permissions->origins.reset(new std::vector<std::string>());
  63   URLPatternSet hosts = set->explicit_hosts();
  64   for (URLPatternSet::const_iterator i = hosts.begin(); i != hosts.end(); ++i)
  65     permissions->origins->push_back(i->GetAsString());
  66
  67   return scoped_ptr<Permissions>(permissions);
  68 }
  69
  70 scoped_refptr<PermissionSet> UnpackPermissionSet(
  71     const Permissions& permissions,
  72     bool allow_file_access,
  73     std::string* error) {
  74   DCHECK(error);
  75   APIPermissionSet apis;
  76   std::vector<std::string>* permissions_list = permissions.permissions.get();
  77   if (permissions_list) {
  78     PermissionsInfo* info = PermissionsInfo::GetInstance();
  79     for (std::vector<std::string>::iterator it = permissions_list->begin();
  80         it != permissions_list->end(); ++it) {
  81       // This is a compromise: we currently can't switch to a blend of
  82       // objects/strings all the way through the API. Until then, put this
  83       // processing here.
  84       // http://code.google.com/p/chromium/issues/detail?id=162042
  85       if (it->find(kDelimiter) != std::string::npos) {
  86         size_t delimiter = it->find(kDelimiter);
  87         std::string permission_name = it->substr(0, delimiter);
  88         std::string permission_arg = it->substr(delimiter + 1);
  89
  90         scoped_ptr<base::Value> permission_json(
  91             base::JSONReader::Read(permission_arg));
  92         if (!permission_json.get()) {
  93           *error = ErrorUtils::FormatErrorMessage(kInvalidParameter, *it);
  94           return NULL;
  95         }
  96
  97         APIPermission* permission = NULL;
  98
  99         // Explicitly check the permissions that accept arguments until the bug
 100         // referenced above is fixed.
 101         const APIPermissionInfo* usb_device_permission_info =
 102             info->GetByID(APIPermission::kUsbDevice);
 103         if (permission_name == usb_device_permission_info->name()) {
 104           permission = new UsbDevicePermission(usb_device_permission_info);
 105         } else {
 106           *error = kUnsupportedPermissionId;
 107           return NULL;
 108         }
 109
 110         CHECK(permission);
 111         if (!permission->FromValue(permission_json.get(), NULL)) {
 112           *error = ErrorUtils::FormatErrorMessage(kInvalidParameter, *it);
 113           return NULL;
 114         }
 115         apis.insert(permission);
 116       } else {
 117         const APIPermissionInfo* permission_info = info->GetByName(*it);
 118         if (!permission_info) {
 119           *error = ErrorUtils::FormatErrorMessage(
 120               kUnknownPermissionError, *it);
 121           return NULL;
 122         }
 123         apis.insert(permission_info->id());
 124       }
 125     }
 126   }
 127
 128   // TODO(rpaquay): We currently don't expose manifest permissions
 129   // to apps/extensions via the permissions API.
 130   ManifestPermissionSet manifest_permissions;
 131
 132   URLPatternSet origins;
 133   if (permissions.origins.get()) {
 134     for (std::vector<std::string>::iterator it = permissions.origins->begin();
 135         it != permissions.origins->end(); ++it) {
 136       int allowed_schemes = Extension::kValidHostPermissionSchemes;
 137       if (!allow_file_access)
 138         allowed_schemes &= ~URLPattern::SCHEME_FILE;
 139       URLPattern origin(allowed_schemes);
 140       URLPattern::ParseResult parse_result = origin.Parse(*it);
 141       if (URLPattern::PARSE_SUCCESS != parse_result) {
 142         *error = ErrorUtils::FormatErrorMessage(
 143             kInvalidOrigin,
 144             *it,
 145             URLPattern::GetParseResultString(parse_result));
 146         return NULL;
 147       }
 148       origins.AddPattern(origin);
 149     }
 150   }
 151
 152   return scoped_refptr<PermissionSet>(
 153       new PermissionSet(apis, manifest_permissions, origins, URLPatternSet()));
 154 }
 155
 156 }  // namespace permissions_api_helpers
 157 }  // namespace extensions