Remove obsolete UserSettings class

chrome/browser/sync/util/user_settings.cc

Index: chrome/browser/sync/util/user_settings.cc
diff --git a/chrome/browser/sync/util/user_settings.cc b/chrome/browser/sync/util/user_settings.cc
deleted file mode 100644
index 2ab090e639f276da855e34889c6a407efcdd45da..0000000000000000000000000000000000000000
--- a/chrome/browser/sync/util/user_settings.cc
+++ /dev/null
@@ -1,465 +0,0 @@
-// Copyright (c) 2011 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.
-//
-// This class isn't pretty. It's just a step better than globals, which is what
-// these were previously.
-
-#include "chrome/browser/sync/util/user_settings.h"
-
-#include "build/build_config.h"
-
-#if defined(OS_WIN)
-#include <windows.h>
-#endif
-
-#include <limits>
-#include <string>
-#include <vector>
-
-#include "base/file_util.h"
-#include "base/md5.h"
-#include "base/rand_util.h"
-#include "base/string_util.h"
-#include "chrome/browser/sync/syncable/directory_manager.h"  // For migration.
-#include "chrome/browser/sync/util/data_encryption.h"
-#include "chrome/browser/sync/util/sqlite_utils.h"
-#include "chrome/common/random.h"
-
-using std::numeric_limits;
-using std::string;
-using std::vector;
-
-using syncable::DirectoryManager;
-
-namespace browser_sync {
-
-void ExecOrDie(sqlite3* dbhandle, const char *query) {
-  sqlite_utils::SQLStatement statement;
-  statement.prepare(dbhandle, query);
-  if (SQLITE_DONE != statement.step()) {
-    LOG(FATAL) << query << "\n" << sqlite3_errmsg(dbhandle);
-  }
-}
-
-// Useful for encoding any sequence of bytes into a string that can be used in
-// a table name. Kind of like hex encoding, except that A is zero and P is 15.
-string APEncode(const string& in) {
-  string result;
-  result.reserve(in.size() * 2);
-  for (string::const_iterator i = in.begin(); i != in.end(); ++i) {
-    unsigned int c = static_cast<unsigned char>(*i);
-    result.push_back((c & 0x0F) + 'A');
-    result.push_back(((c >> 4) & 0x0F) + 'A');
-  }
-  return result;
-}
-
-string APDecode(const string& in) {
-  string result;
-  result.reserve(in.size() / 2);
-  for (string::const_iterator i = in.begin(); i != in.end(); ++i) {
-    unsigned int c = *i - 'A';
-    if (++i != in.end())
-      c = c | (static_cast<unsigned char>(*i - 'A') << 4);
-    result.push_back(c);
-  }
-  return result;
-}
-
-static const char PASSWORD_HASH[] = "password_hash2";
-static const char SALT[] = "salt2";
-
-static const int kSaltSize = 20;
-static const int kCurrentDBVersion = 12;
-
-UserSettings::ScopedDBHandle::ScopedDBHandle(UserSettings* settings)
-    : mutex_lock_(settings->dbhandle_mutex_), handle_(&settings->dbhandle_) {
-}
-
-UserSettings::UserSettings() : dbhandle_(NULL) {
-}
-
-string UserSettings::email() const {
-  base::AutoLock lock(mutex_);
-  return email_;
-}
-
-static void MakeSigninsTable(sqlite3* const dbhandle) {
-  // Multiple email addresses can map to the same Google Account. This table
-  // keeps a map of sign-in email addresses to primary Google Account email
-  // addresses.
-  ExecOrDie(dbhandle,
-            "CREATE TABLE signins"
-            " (signin, primary_email, "
-            " PRIMARY KEY(signin, primary_email) ON CONFLICT REPLACE)");
-}
-
-void UserSettings::MigrateOldVersionsAsNeeded(sqlite3* const handle,
-    int current_version) {
-  switch (current_version) {
-    // Versions 1-9 are unhandled.  Version numbers greater than
-    // kCurrentDBVersion should have already been weeded out by the caller.
-    default:
-      // When the version is too old, we just try to continue anyway.  There
-      // should not be a released product that makes a database too old for us
-      // to handle.
-      LOG(WARNING) << "UserSettings database version " << current_version <<
-          " is too old to handle.";
-      return;
-    case 10:
-      {
-        // Scrape the 'shares' table to find the syncable DB.  'shares' had a
-        // pair of string columns that mapped the username to the filename of
-        // the sync data sqlite3 file.  Version 11 switched to a constant
-        // filename, so here we read the string, copy the file to the new name,
-        // delete the old one, and then drop the unused shares table.
-        sqlite_utils::SQLStatement share_query;
-        share_query.prepare(handle, "SELECT share_name, file_name FROM shares");
-        int query_result = share_query.step();
-        CHECK(SQLITE_ROW == query_result);
-        FilePath::StringType share_name, file_name;
-#if defined(OS_POSIX)
-        share_name = share_query.column_string(0);
-        file_name = share_query.column_string(1);
-#else
-        share_name = share_query.column_wstring(0);
-        file_name = share_query.column_wstring(1);
-#endif
-
-        const FilePath& src_syncdata_path = FilePath(file_name);
-        FilePath dst_syncdata_path(src_syncdata_path.DirName());
-        file_util::AbsolutePath(&dst_syncdata_path);
-        dst_syncdata_path = dst_syncdata_path.Append(
-            DirectoryManager::GetSyncDataDatabaseFilename());
-        if (!file_util::Move(src_syncdata_path, dst_syncdata_path)) {
-          LOG(WARNING) << "Unable to upgrade UserSettings from v10";
-          return;
-        }
-      }
-      ExecOrDie(handle, "DROP TABLE shares");
-      ExecOrDie(handle, "UPDATE db_version SET version = 11");
-    // FALL THROUGH
-    case 11:
-      ExecOrDie(handle, "DROP TABLE signin_types");
-      ExecOrDie(handle, "UPDATE db_version SET version = 12");
-    // FALL THROUGH
-    case kCurrentDBVersion:
-      // Nothing to migrate.
-      return;
-  }
-}
-
-static void MakeCookiesTable(sqlite3* const dbhandle) {
-  // This table keeps a list of auth tokens for each signed in account. There
-  // will be as many rows as there are auth tokens per sign in.
-  // The service_token column will store encrypted values.
-  ExecOrDie(dbhandle,
-            "CREATE TABLE cookies"
-            " (email, service_name, service_token, "
-            " PRIMARY KEY(email, service_name) ON CONFLICT REPLACE)");
-}
-
-static void MakeClientIDTable(sqlite3* const dbhandle) {
-  // Stores a single client ID value that can be used as the client id, if
-  // there's not another such ID provided on the install.
-  ExecOrDie(dbhandle, "CREATE TABLE client_id (id) ");
-  {
-    sqlite_utils::SQLStatement statement;
-    statement.prepare(dbhandle,
-                      "INSERT INTO client_id values ( ? )");
-    statement.bind_string(0, Generate128BitRandomBase64String());
-    if (SQLITE_DONE != statement.step()) {
-      LOG(FATAL) << "INSERT INTO client_id\n" << sqlite3_errmsg(dbhandle);
-    }
-  }
-}
-
-bool UserSettings::Init(const FilePath& settings_path) {
-  {  // Scope the handle.
-    ScopedDBHandle dbhandle(this);
-    if (dbhandle_)
-      sqlite3_close(dbhandle_);
-
-    if (SQLITE_OK != sqlite_utils::OpenSqliteDb(settings_path, &dbhandle_))
-      return false;
-
-    // In the worst case scenario, the user may hibernate his computer during
-    // one of our transactions.
-    sqlite3_busy_timeout(dbhandle_, numeric_limits<int>::max());
-    ExecOrDie(dbhandle.get(), "PRAGMA fullfsync = 1");
-    ExecOrDie(dbhandle.get(), "PRAGMA synchronous = 2");
-
-    sqlite_utils::SQLTransaction transaction(dbhandle.get());
-    transaction.BeginExclusive();
-    sqlite_utils::SQLStatement table_query;
-    table_query.prepare(dbhandle.get(),
-                        "select count(*) from sqlite_master"
-                        " where type = 'table' and name = 'db_version'");
-    int query_result = table_query.step();
-    CHECK(SQLITE_ROW == query_result);
-    int table_count = table_query.column_int(0);
-    table_query.reset();
-    if (table_count > 0) {
-      sqlite_utils::SQLStatement version_query;
-      version_query.prepare(dbhandle.get(),
-                            "SELECT version FROM db_version");
-      query_result = version_query.step();
-      CHECK(SQLITE_ROW == query_result);
-      const int version = version_query.column_int(0);
-      version_query.reset();
-      if (version > kCurrentDBVersion) {
-        LOG(WARNING) << "UserSettings database is too new.";
-        return false;
-      }
-
-      MigrateOldVersionsAsNeeded(dbhandle.get(), version);
-    } else {
-      // Create settings table.
-      {
-        sqlite_utils::SQLStatement statement;
-        statement.prepare(dbhandle.get(),
-                          "CREATE TABLE settings"
-                          " (email, key, value, "
-                          "  PRIMARY KEY(email, key) ON CONFLICT REPLACE)");
-        if (SQLITE_DONE != statement.step()) {
-          return false;
-        }
-      }
-      // Create and populate version table.
-      {
-        sqlite_utils::SQLStatement statement;
-        statement.prepare(dbhandle.get(),
-                          "CREATE TABLE db_version ( version )");
-        if (SQLITE_DONE != statement.step()) {
-          return false;
-        }
-      }
-      {
-        sqlite_utils::SQLStatement statement;
-        statement.prepare(dbhandle.get(),
-                          "INSERT INTO db_version values ( ? )");
-        statement.bind_int(0, kCurrentDBVersion);
-        if (SQLITE_DONE != statement.step()) {
-          return false;
-        }
-      }
-
-      MakeSigninsTable(dbhandle.get());
-      MakeCookiesTable(dbhandle.get());
-      MakeClientIDTable(dbhandle.get());
-    }
-    transaction.Commit();
-  }
-#if defined(OS_WIN)
-  // Do not index this file. Scanning can occur every time we close the file,
-  // which causes long delays in SQLite's file locking.
-  const DWORD attrs = GetFileAttributes(settings_path.value().c_str());
-  const BOOL attrs_set =
-    SetFileAttributes(settings_path.value().c_str(),
-                      attrs | FILE_ATTRIBUTE_NOT_CONTENT_INDEXED);
-#endif
-  return true;
-}
-
-UserSettings::~UserSettings() {
-  if (dbhandle_)
-    sqlite3_close(dbhandle_);
-}
-
-const int32 kInvalidHash = 0xFFFFFFFF;
-
-// We use 10 bits of data from the MD5 digest as the hash.
-const int32 kHashMask = 0x3FF;
-
-int32 GetHashFromDigest(base::MD5Digest& digest) {
-  int32 hash = 0;
-  int32 mask = kHashMask;
-  for (size_t i = 0; i < sizeof(digest.a); ++i) {
-    hash = hash << 8;
-    hash = hash | (digest.a[i] & kHashMask);
-    mask = mask >> 8;
-    if (0 == mask)
-      break;
-  }
-  return hash;
-}
-
-void UserSettings::StoreEmailForSignin(const string& signin,
-                                       const string& primary_email) {
-  ScopedDBHandle dbhandle(this);
-  sqlite_utils::SQLTransaction transaction(dbhandle.get());
-  int sqlite_result = transaction.BeginExclusive();
-  CHECK(SQLITE_OK == sqlite_result);
-  sqlite_utils::SQLStatement query;
-  query.prepare(dbhandle.get(),
-                "SELECT COUNT(*) FROM signins"
-                " WHERE signin = ? AND primary_email = ?");
-  query.bind_string(0, signin);
-  query.bind_string(1, primary_email);
-  int query_result = query.step();
-  CHECK(SQLITE_ROW == query_result);
-  int32 count = query.column_int(0);
-  query.reset();
-  if (0 == count) {
-    // Migrate any settings the user might have from earlier versions.
-    {
-      sqlite_utils::SQLStatement statement;
-      statement.prepare(dbhandle.get(),
-                        "UPDATE settings SET email = ? WHERE email = ?");
-      statement.bind_string(0, signin);
-      statement.bind_string(1, primary_email);
-      if (SQLITE_DONE != statement.step()) {
-        LOG(FATAL) << sqlite3_errmsg(dbhandle.get());
-      }
-    }
-    // Store this signin:email mapping.
-    {
-      sqlite_utils::SQLStatement statement;
-      statement.prepare(dbhandle.get(),
-                        "INSERT INTO signins(signin, primary_email)"
-                        " values ( ?, ? )");
-      statement.bind_string(0, signin);
-      statement.bind_string(1, primary_email);
-      if (SQLITE_DONE != statement.step()) {
-        LOG(FATAL) << sqlite3_errmsg(dbhandle.get());
-      }
-    }
-  }
-  transaction.Commit();
-}
-
-// string* signin is both the input and the output of this function.
-bool UserSettings::GetEmailForSignin(string* signin) {
-  ScopedDBHandle dbhandle(this);
-  string result;
-  sqlite_utils::SQLStatement query;
-  query.prepare(dbhandle.get(),
-                "SELECT primary_email FROM signins WHERE signin = ?");
-  query.bind_string(0, *signin);
-  int query_result = query.step();
-  if (SQLITE_ROW == query_result) {
-    query.column_string(0, &result);
-    if (!result.empty()) {
-      swap(result, *signin);
-      return true;
-    }
-  }
-  return false;
-}
-
-void UserSettings::StoreHashedPassword(const string& email,
-                                       const string& password) {
-  // Save one-way hashed password:
-  char binary_salt[kSaltSize];
-  base::RandBytes(binary_salt, sizeof(binary_salt));
-
-  const string salt = APEncode(string(binary_salt, sizeof(binary_salt)));
-  base::MD5Context md5_context;
-  base::MD5Init(&md5_context);
-  base::MD5Update(&md5_context, salt);
-  base::MD5Update(&md5_context, password);
-  base::MD5Digest md5_digest;
-  base::MD5Final(&md5_digest, &md5_context);
-
-  ScopedDBHandle dbhandle(this);
-  sqlite_utils::SQLTransaction transaction(dbhandle.get());
-  transaction.BeginExclusive();
-  {
-    sqlite_utils::SQLStatement statement;
-    statement.prepare(dbhandle.get(),
-                      "INSERT INTO settings(email, key, value)"
-                      " values ( ?, ?, ? )");
-    statement.bind_string(0, email);
-    statement.bind_string(1, PASSWORD_HASH);
-    statement.bind_int(2, GetHashFromDigest(md5_digest));
-    if (SQLITE_DONE != statement.step()) {
-      LOG(FATAL) << sqlite3_errmsg(dbhandle.get());
-    }
-  }
-  {
-    sqlite_utils::SQLStatement statement;
-    statement.prepare(dbhandle.get(),
-                      "INSERT INTO settings(email, key, value)"
-                      " values ( ?, ?, ? )");
-    statement.bind_string(0, email);
-    statement.bind_string(1, SALT);
-    statement.bind_string(2, salt);
-    if (SQLITE_DONE != statement.step()) {
-      LOG(FATAL) << sqlite3_errmsg(dbhandle.get());
-    }
-  }
-  transaction.Commit();
-}
-
-bool UserSettings::VerifyAgainstStoredHash(const string& email,
-                                           const string& password) {
-  ScopedDBHandle dbhandle(this);
-  string salt_and_digest;
-
-  sqlite_utils::SQLStatement query;
-  query.prepare(dbhandle.get(),
-                "SELECT key, value FROM settings"
-                " WHERE email = ? AND (key = ? OR key = ?)");
-  query.bind_string(0, email);
-  query.bind_string(1, PASSWORD_HASH);
-  query.bind_string(2, SALT);
-  int query_result = query.step();
-  string salt;
-  int32 hash = kInvalidHash;
-  while (SQLITE_ROW == query_result) {
-    string key(query.column_string(0));
-    if (key == SALT)
-      salt = query.column_string(1);
-    else
-      hash = query.column_int(1);
-    query_result = query.step();
-  }
-  CHECK(SQLITE_DONE == query_result);
-  if (salt.empty() || hash == kInvalidHash)
-    return false;
-  base::MD5Context md5_context;
-  base::MD5Init(&md5_context);
-  base::MD5Update(&md5_context, salt);
-  base::MD5Update(&md5_context, password);
-  base::MD5Digest md5_digest;
-  base::MD5Final(&md5_digest, &md5_context);
-  return hash == GetHashFromDigest(md5_digest);
-}
-
-void UserSettings::SwitchUser(const string& username) {
-  {
-    base::AutoLock lock(mutex_);
-    email_ = username;
-  }
-}
-
-string UserSettings::GetClientId() {
-  ScopedDBHandle dbhandle(this);
-  sqlite_utils::SQLStatement statement;
-  statement.prepare(dbhandle.get(), "SELECT id FROM client_id");
-  int query_result = statement.step();
-  string client_id;
-  if (query_result == SQLITE_ROW)
-    client_id = statement.column_string(0);
-  return client_id;
-}
-
-void UserSettings::ClearAllServiceTokens() {
-  ScopedDBHandle dbhandle(this);
-  ExecOrDie(dbhandle.get(), "DELETE FROM cookies");
-}
-
-bool UserSettings::GetLastUser(string* username) {
-  ScopedDBHandle dbhandle(this);
-  sqlite_utils::SQLStatement query;
-  query.prepare(dbhandle.get(), "SELECT email FROM cookies");
-  if (SQLITE_ROW == query.step()) {
-    *username = query.column_string(0);
-    return true;
-  } else {
-    return false;
-  }
-}
-
-}  // namespace browser_sync