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      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/extension.h"
     12 #include "chrome/common/extensions/permissions/permission_set.h"
     13 #include "chrome/common/extensions/permissions/permissions_info.h"
     14 #include "chrome/common/extensions/permissions/usb_device_permission.h"
     15 #include "extensions/common/error_utils.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   permissions->origins.reset(new std::vector<std::string>());
     60   URLPatternSet hosts = set->explicit_hosts();
     61   for (URLPatternSet::const_iterator i = hosts.begin(); i != hosts.end(); ++i)
     62     permissions->origins->push_back(i->GetAsString());
     63 
     64   return scoped_ptr<Permissions>(permissions);
     65 }
     66 
     67 scoped_refptr<PermissionSet> UnpackPermissionSet(
     68     const Permissions& permissions,
     69     bool allow_file_access,
     70     std::string* error) {
     71   APIPermissionSet apis;
     72   std::vector<std::string>* permissions_list = permissions.permissions.get();
     73   if (permissions_list) {
     74     PermissionsInfo* info = PermissionsInfo::GetInstance();
     75     for (std::vector<std::string>::iterator it = permissions_list->begin();
     76         it != permissions_list->end(); ++it) {
     77       // This is a compromise: we currently can't switch to a blend of
     78       // objects/strings all the way through the API. Until then, put this
     79       // processing here.
     80       // http://code.google.com/p/chromium/issues/detail?id=162042
     81       if (it->find(kDelimiter) != std::string::npos) {
     82         size_t delimiter = it->find(kDelimiter);
     83         std::string permission_name = it->substr(0, delimiter);
     84         std::string permission_arg = it->substr(delimiter + 1);
     85 
     86         scoped_ptr<base::Value> permission_json(
     87             base::JSONReader::Read(permission_arg));
     88         if (!permission_json.get()) {
     89           *error = ErrorUtils::FormatErrorMessage(kInvalidParameter, *it);
     90           return NULL;
     91         }
     92 
     93         APIPermission* permission = NULL;
     94 
     95         // Explicitly check the permissions that accept arguments until the bug
     96         // referenced above is fixed.
     97         const APIPermissionInfo* usb_device_permission_info =
     98             info->GetByID(APIPermission::kUsbDevice);
     99         if (permission_name == usb_device_permission_info->name()) {
    100           permission = new UsbDevicePermission(usb_device_permission_info);
    101         } else {
    102           *error = kUnsupportedPermissionId;
    103           return NULL;
    104         }
    105 
    106         CHECK(permission);
    107         if (!permission->FromValue(permission_json.get())) {
    108           *error = ErrorUtils::FormatErrorMessage(kInvalidParameter, *it);
    109           return NULL;
    110         }
    111         apis.insert(permission);
    112       } else {
    113         const APIPermissionInfo* permission_info = info->GetByName(*it);
    114         if (!permission_info) {
    115           *error = ErrorUtils::FormatErrorMessage(
    116               kUnknownPermissionError, *it);
    117           return NULL;
    118         }
    119         apis.insert(permission_info->id());
    120       }
    121     }
    122   }
    123 
    124   URLPatternSet origins;
    125   if (permissions.origins.get()) {
    126     for (std::vector<std::string>::iterator it = permissions.origins->begin();
    127         it != permissions.origins->end(); ++it) {
    128       int allowed_schemes = Extension::kValidHostPermissionSchemes;
    129       if (!allow_file_access)
    130         allowed_schemes &= ~URLPattern::SCHEME_FILE;
    131       URLPattern origin(allowed_schemes);
    132       URLPattern::ParseResult parse_result = origin.Parse(*it);
    133       if (URLPattern::PARSE_SUCCESS != parse_result) {
    134         *error = ErrorUtils::FormatErrorMessage(
    135             kInvalidOrigin,
    136             *it,
    137             URLPattern::GetParseResultString(parse_result));
    138         return NULL;
    139       }
    140       origins.AddPattern(origin);
    141     }
    142   }
    143 
    144   return scoped_refptr<PermissionSet>(
    145       new PermissionSet(apis, origins, URLPatternSet()));
    146 }
    147 
    148 }  // namespace permissions_api
    149 }  // namespace extensions
    150