Index: extensions/common/id_util.cc |
diff --git a/extensions/common/id_util.cc b/extensions/common/id_util.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..5bdeba42aa48436259f0f815ceb700e588d538d3 |
--- /dev/null |
+++ b/extensions/common/id_util.cc |
@@ -0,0 +1,73 @@ |
+// 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/string_number_conversions.h" |
+#include "base/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 = 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] == ':') |
+ path_str[0] += ('A' - 'a'); |
+ |
+ return base::FilePath(path_str); |
+#else |
+ return path; |
+#endif |
+} |
+ |
+} // namespace id_util |
+} // namespace extensions |