Move browser-agnostic code from file_system_util to file_system_core_util.

chrome/browser/chromeos/drive/file_system_core_util.cc

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/chromeos/drive/file_system_core_util.h"
+
+#include <string>
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/bind.h"
+#include "base/bind_helpers.h"
+#include "base/files/file_path.h"
+#include "base/files/file_util.h"
+#include "base/i18n/icu_string_conversions.h"
+#include "base/json/json_file_value_serializer.h"
+#include "base/logging.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/prefs/pref_service.h"
+#include "base/strings/string_number_conversions.h"
+#include "base/strings/string_util.h"
+#include "base/strings/stringprintf.h"
+#include "base/thread_task_runner_handle.h"
+#include "base/threading/sequenced_worker_pool.h"
+#include "chrome/browser/chromeos/drive/drive.pb.h"
+#include "chrome/browser/chromeos/drive/drive_pref_names.h"
+#include "chrome/browser/chromeos/drive/file_system_interface.h"
+#include "chrome/browser/chromeos/drive/job_list.h"
+#include "chrome/browser/chromeos/drive/write_on_cache_file.h"
+#include "net/base/escape.h"
+
+namespace drive {
+namespace util {
+
+namespace {
+
+std::string ReadStringFromGDocFile(const base::FilePath& file_path,
+                                   const std::string& key) {
+  const int64 kMaxGDocSize = 4096;
+  int64 file_size = 0;
+  if (!base::GetFileSize(file_path, &file_size) || file_size > kMaxGDocSize) {
+    LOG(WARNING) << "File too large to be a GDoc file " << file_path.value();
+    return std::string();
+  }
+
+  JSONFileValueDeserializer reader(file_path);
+  std::string error_message;
+  scoped_ptr<base::Value> root_value(reader.Deserialize(NULL, &error_message));
+  if (!root_value) {
+    LOG(WARNING) << "Failed to parse " << file_path.value() << " as JSON."
+                 << " error = " << error_message;
+    return std::string();
+  }
+
+  base::DictionaryValue* dictionary_value = NULL;
+  std::string result;
+  if (!root_value->GetAsDictionary(&dictionary_value) ||
+      !dictionary_value->GetString(key, &result)) {
+    LOG(WARNING) << "No value for the given key is stored in "
+                 << file_path.value() << ". key = " << key;
+    return std::string();
+  }
+
+  return result;
+}
+
+}  // namespace
+
+const base::FilePath& GetDriveGrandRootPath() {
+  CR_DEFINE_STATIC_LOCAL(
+      base::FilePath, grand_root_path,
+      (base::FilePath::FromUTF8Unsafe(kDriveGrandRootDirName)));
+  return grand_root_path;
+}
+
+const base::FilePath& GetDriveMyDriveRootPath() {
+  CR_DEFINE_STATIC_LOCAL(
+      base::FilePath, drive_root_path,
+      (GetDriveGrandRootPath().AppendASCII(kDriveMyDriveRootDirName)));
+  return drive_root_path;
+}
+
+base::FilePath GetDriveMountPointPathForUserIdHash(
+    const std::string user_id_hash) {
+  static const base::FilePath::CharType kSpecialMountPointRoot[] =
+      FILE_PATH_LITERAL("/special");
+  static const char kDriveMountPointNameBase[] = "drive";
+  return base::FilePath(kSpecialMountPointRoot)
+      .AppendASCII(net::EscapeQueryParamValue(
+          kDriveMountPointNameBase +
+              (user_id_hash.empty() ? "" : "-" + user_id_hash),
+          false));
+}
+
+bool IsUnderDriveMountPoint(const base::FilePath& path) {
+  return !ExtractDrivePath(path).empty();
+}
+
+base::FilePath ExtractDrivePath(const base::FilePath& path) {
+  std::vector<base::FilePath::StringType> components;
+  path.GetComponents(&components);
+  if (components.size() < 3)
+    return base::FilePath();
+  if (components[0] != FILE_PATH_LITERAL("/"))
+    return base::FilePath();
+  if (components[1] != FILE_PATH_LITERAL("special"))
+    return base::FilePath();
+  static const base::FilePath::CharType kPrefix[] = FILE_PATH_LITERAL("drive");
+  if (components[2].compare(0, arraysize(kPrefix) - 1, kPrefix) != 0)
+    return base::FilePath();
+
+  base::FilePath drive_path = GetDriveGrandRootPath();
+  for (size_t i = 3; i < components.size(); ++i)
+    drive_path = drive_path.Append(components[i]);
+  return drive_path;
+}
+
+std::string EscapeCacheFileName(const std::string& filename) {
+  // This is based on net/base/escape.cc: net::(anonymous namespace)::Escape
+  std::string escaped;
+  for (size_t i = 0; i < filename.size(); ++i) {
+    char c = filename[i];
+    if (c == '%' || c == '.' || c == '/') {
+      base::StringAppendF(&escaped, "%%%02X", c);
+    } else {
+      escaped.push_back(c);
+    }
+  }
+  return escaped;
+}
+
+std::string UnescapeCacheFileName(const std::string& filename) {
+  std::string unescaped;
+  for (size_t i = 0; i < filename.size(); ++i) {
+    char c = filename[i];
+    if (c == '%' && i + 2 < filename.length()) {
+      c = (base::HexDigitToInt(filename[i + 1]) << 4) +
+          base::HexDigitToInt(filename[i + 2]);
+      i += 2;
+    }
+    unescaped.push_back(c);
+  }
+  return unescaped;
+}
+
+std::string NormalizeFileName(const std::string& input) {
+  DCHECK(base::IsStringUTF8(input));
+
+  std::string output;
+  if (!base::ConvertToUtf8AndNormalize(input, base::kCodepageUTF8, &output))
+    output = input;
+  base::ReplaceChars(output, "/", "_", &output);
+  if (!output.empty() && output.find_first_not_of('.', 0) == std::string::npos)
+    output = "_";
+  return output;
+}
+
+void EmptyFileOperationCallback(FileError error) {
+}
+
+bool CreateGDocFile(const base::FilePath& file_path,
+                    const GURL& url,
+                    const std::string& resource_id) {
+  std::string content =
+      base::StringPrintf("{\"url\": \"%s\", \"resource_id\": \"%s\"}",
+                         url.spec().c_str(), resource_id.c_str());
+  return base::WriteFile(file_path, content.data(), content.size()) ==
+         static_cast<int>(content.size());
+}
+
+GURL ReadUrlFromGDocFile(const base::FilePath& file_path) {
+  return GURL(ReadStringFromGDocFile(file_path, "url"));
+}
+
+std::string ReadResourceIdFromGDocFile(const base::FilePath& file_path) {
+  return ReadStringFromGDocFile(file_path, "resource_id");
+}
+
+}  // namespace util
+}  // namespace drive