chrome/browser/chromeos/file_system_provider/operations/get_metadata.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 "chrome/browser/chromeos/file_system_provider/operations/get_metadata.h"
   6
   7 #include <algorithm>
   8 #include <string>
   9
  10 #include "chrome/common/extensions/api/file_system_provider.h"
  11 #include "chrome/common/extensions/api/file_system_provider_internal.h"
  12
  13 namespace chromeos {
  14 namespace file_system_provider {
  15 namespace operations {
  16 namespace {
  17
  18 // Convert |value| into |output|. If parsing fails, then returns false.
  19 bool ConvertRequestValueToFileInfo(scoped_ptr<RequestValue> value,
  20                                    bool root_entry,
  21                                    EntryMetadata* output) {
  22   using extensions::api::file_system_provider::EntryMetadata;
  23   using extensions::api::file_system_provider_internal::
  24       GetMetadataRequestedSuccess::Params;
  25
  26   const Params* params = value->get_metadata_success_params();
  27   if (!params)
  28     return false;
  29
  30   if (!ValidateIDLEntryMetadata(params->metadata, root_entry))
  31     return false;
  32
  33   output->name = params->metadata.name;
  34   output->is_directory = params->metadata.is_directory;
  35   output->size = static_cast<int64>(params->metadata.size);
  36
  37   std::string input_modification_time;
  38   if (!params->metadata.modification_time.additional_properties.GetString(
  39           "value", &input_modification_time)) {
  40     NOTREACHED();
  41   }
  42
  43   // Allow to pass invalid modification time, since there is no way to verify
  44   // it easily on any earlier stage.
  45   base::Time::FromString(input_modification_time.c_str(),
  46                          &output->modification_time);
  47
  48   if (params->metadata.mime_type.get())
  49     output->mime_type = *params->metadata.mime_type.get();
  50
  51   if (params->metadata.thumbnail.get())
  52     output->thumbnail = *params->metadata.thumbnail.get();
  53
  54   return true;
  55 }
  56
  57 }  // namespace
  58
  59 bool ValidateIDLEntryMetadata(
  60     const extensions::api::file_system_provider::EntryMetadata& metadata,
  61     bool root_entry) {
  62   using extensions::api::file_system_provider::EntryMetadata;
  63
  64   if (!ValidateName(metadata.name, root_entry))
  65     return false;
  66
  67   std::string input_modification_time;
  68   if (!metadata.modification_time.additional_properties.GetString(
  69           "value", &input_modification_time)) {
  70     return false;
  71   }
  72
  73   if (metadata.thumbnail.get()) {
  74     // Sanity check for the thumbnail format. Note, that another, more granural
  75     // check is done in custom bindings. Note, this is an extra check only for
  76     // the security reasons.
  77     const std::string expected_prefix = "data:";
  78     std::string thumbnail_prefix =
  79         metadata.thumbnail.get()->substr(0, expected_prefix.size());
  80     std::transform(thumbnail_prefix.begin(),
  81                    thumbnail_prefix.end(),
  82                    thumbnail_prefix.begin(),
  83                    ::tolower);
  84
  85     if (expected_prefix != thumbnail_prefix)
  86       return false;
  87   }
  88
  89   return true;
  90 }
  91
  92 bool ValidateName(const std::string& name, bool root_entry) {
  93   if (root_entry)
  94     return name.empty();
  95   return !name.empty() && name.find('/') == std::string::npos;
  96 }
  97
  98 GetMetadata::GetMetadata(
  99     extensions::EventRouter* event_router,
 100     const ProvidedFileSystemInfo& file_system_info,
 101     const base::FilePath& entry_path,
 102     ProvidedFileSystemInterface::MetadataFieldMask fields,
 103     const ProvidedFileSystemInterface::GetMetadataCallback& callback)
 104     : Operation(event_router, file_system_info),
 105       entry_path_(entry_path),
 106       fields_(fields),
 107       callback_(callback) {
 108 }
 109
 110 GetMetadata::~GetMetadata() {
 111 }
 112
 113 bool GetMetadata::Execute(int request_id) {
 114   using extensions::api::file_system_provider::GetMetadataRequestedOptions;
 115
 116   GetMetadataRequestedOptions options;
 117   options.file_system_id = file_system_info_.file_system_id();
 118   options.request_id = request_id;
 119   options.entry_path = entry_path_.AsUTF8Unsafe();
 120   options.thumbnail =
 121       fields_ & ProvidedFileSystemInterface::METADATA_FIELD_THUMBNAIL;
 122
 123   return SendEvent(
 124       request_id,
 125       extensions::events::FILE_SYSTEM_PROVIDER_ON_GET_METADATA_REQUESTED,
 126       extensions::api::file_system_provider::OnGetMetadataRequested::kEventName,
 127       extensions::api::file_system_provider::OnGetMetadataRequested::Create(
 128           options));
 129 }
 130
 131 void GetMetadata::OnSuccess(int /* request_id */,
 132                             scoped_ptr<RequestValue> result,
 133                             bool has_more) {
 134   scoped_ptr<EntryMetadata> metadata(new EntryMetadata);
 135   const bool convert_result = ConvertRequestValueToFileInfo(
 136       result.Pass(), entry_path_.AsUTF8Unsafe() == FILE_PATH_LITERAL("/"),
 137       metadata.get());
 138
 139   if (!convert_result) {
 140     LOG(ERROR) << "Failed to parse a response for the get metadata operation.";
 141     callback_.Run(make_scoped_ptr<EntryMetadata>(NULL),
 142                   base::File::FILE_ERROR_IO);
 143     return;
 144   }
 145
 146   callback_.Run(metadata.Pass(), base::File::FILE_OK);
 147 }
 148
 149 void GetMetadata::OnError(int /* request_id */,
 150                           scoped_ptr<RequestValue> /* result */,
 151                           base::File::Error error) {
 152   callback_.Run(make_scoped_ptr<EntryMetadata>(NULL), error);
 153 }
 154 }  // namespace operations
 155 }  // namespace file_system_provider
 156 }  // namespace chromeos