Extensions: Move id_util functions to crx_file component.

components/crx_file/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 "components/crx_file/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)) {
+    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 crx_file {
 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)));
@@ skipping 19 matching lines @@
   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
 }
 
+bool IdIsValid(const std::string& id) {
+  // Verify that the id is legal.
+  if (id.size() != (crx_file::id_util::kIdSize * 2))
+    return false;
+
+  // We only support lowercase IDs, because IDs can be used as URL components
+  // (where GURL will lowercase it).
+  std::string temp = base::StringToLowerASCII(id);
+  for (size_t i = 0; i < temp.size(); i++)
+    if (temp[i] < 'a' || temp[i] > 'p')
+      return false;
+
+  return true;
+}
+
 }  // namespace id_util
-}  // namespace extensions
+}  // namespace crx_file