Extensions: Move id_util functions to crx_file component.

extensions/common/id_util.cc

-// Copyright (c) 2013 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 "extensions/common/id_util.h"
-
-#include "base/files/file_path.h"
-#include "base/strings/string_number_conversions.h"
-#include "base/strings/string_util.h"
-#include "crypto/sha2.h"
-
-namespace {
-
-// Converts a normal hexadecimal string into the alphabet used by extensions.
-// We use the characters 'a'-'p' instead of '0'-'f' to avoid ever having a
-// completely numeric host, since some software interprets that as an IP
-// address.
-static void ConvertHexadecimalToIDAlphabet(std::string* id) {
-  for (size_t i = 0; i < id->size(); ++i) {
-    int val;
-    if (base::HexStringToInt(base::StringPiece(id->begin() + i,
-                                               id->begin() + i + 1),
-                             &val)) {
-      (*id)[i] = val + 'a';
-    } else {
-      (*id)[i] = 'a';
-    }
-  }
-}
-
-}  // namespace
-
-namespace extensions {
-namespace id_util {
-
-// First 16 bytes of SHA256 hashed public key.
-const size_t kIdSize = 16;
-
-std::string GenerateId(const std::string& input) {
-  uint8 hash[kIdSize];
-  crypto::SHA256HashString(input, hash, sizeof(hash));
-  std::string output =
-      base::StringToLowerASCII(base::HexEncode(hash, sizeof(hash)));
-  ConvertHexadecimalToIDAlphabet(&output);
-
-  return output;
-}
-
-std::string GenerateIdForPath(const base::FilePath& path) {
-  base::FilePath new_path = MaybeNormalizePath(path);
-  std::string path_bytes =
-      std::string(reinterpret_cast<const char*>(new_path.value().data()),
-                  new_path.value().size() * sizeof(base::FilePath::CharType));
-  return GenerateId(path_bytes);
-}
-
-base::FilePath MaybeNormalizePath(const base::FilePath& path) {
-#if defined(OS_WIN)
-  // Normalize any drive letter to upper-case. We do this for consistency with
-  // net_utils::FilePathToFileURL(), which does the same thing, to make string
-  // comparisons simpler.
-  base::FilePath::StringType path_str = path.value();
-  if (path_str.size() >= 2 && path_str[0] >= L'a' && path_str[0] <= L'z' &&
-      path_str[1] == L':')
-    path_str[0] = towupper(path_str[0]);
-
-  return base::FilePath(path_str);
-#else
-  return path;
-#endif
-}
-
-}  // namespace id_util
-}  // namespace extensions