[Experimental Framework] Move trial token code to renderer

content/common/origin_trials/trial_token.h

-// 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.
-
-#ifndef CONTENT_COMMON_ORIGIN_TRIALS_TRIAL_TOKEN_H_
-#define CONTENT_COMMON_ORIGIN_TRIALS_TRIAL_TOKEN_H_
-
-#include <string>
-
-#include "base/memory/scoped_ptr.h"
-#include "base/strings/string_piece.h"
-#include "base/time/time.h"
-#include "content/common/content_export.h"
-#include "url/gurl.h"
-
-namespace content {
-
-// The Experimental Framework (EF) provides limited access to experimental
-// features, on a per-origin basis (origin trials). This class defines the trial
-// token data structure, used to securely provide access to an experimental
-// feature.
-//
-// Features are defined by string names, provided by the implementers. The EF
-// code does not maintain an enum or constant list for feature names. Instead,
-// the EF validates the name provided by the feature implementation against any
-// provided tokens.
-//
-// More documentation on the token format can be found at
-// https://docs.google.com/document/d/1v5fi0EUV_QHckVHVF2K4P72iNywnrJtNhNZ6i2NPt0M
-
-class CONTENT_EXPORT TrialToken {
- public:
-  ~TrialToken();
-
-  // Returns a token object if the string represents a well-formed token, or
-  // nullptr otherwise. (This does not mean that the token is valid, just that
-  // it can be parsed.)
-  static scoped_ptr<TrialToken> Parse(const std::string& token_text);
-
-  // Returns true if this feature is appropriate for use by the given origin,
-  // for the given feature name. This does not check whether the signature is
-  // valid, or whether the token itself has expired.
-  bool IsAppropriate(const std::string& origin,
-                     const std::string& featureName) const;
-
-  // Returns true if this token has a valid signature, and has not expired.
-  bool IsValid(const base::Time& now) const;
-
-  std::string signature() { return signature_; }
-  std::string data() { return data_; }
-  GURL origin() { return origin_; }
-  std::string feature_name() { return feature_name_; }
-  uint64_t expiry_timestamp() { return expiry_timestamp_; }
-
- protected:
-  friend class TrialTokenTest;
-
-  bool ValidateOrigin(const std::string& origin) const;
-  bool ValidateFeatureName(const std::string& feature_name) const;
-  bool ValidateDate(const base::Time& now) const;
-  bool ValidateSignature(const base::StringPiece& public_key) const;
-
-  static bool ValidateSignature(const std::string& signature_text,
-                                const std::string& data,
-                                const base::StringPiece& public_key);
-
- private:
-  TrialToken(const std::string& signature,
-             const std::string& data,
-             const GURL& origin,
-             const std::string& feature_name,
-             uint64_t expiry_timestamp);
-
-  // The base64-encoded-signature portion of the token. For the token to be
-  // valid, this must be a valid signature for the data portion of the token, as
-  // verified by the public key in trial_token.cc.
-  std::string signature_;
-
-  // The portion of the token string which is signed, and whose signature is
-  // contained in the signature_ member.
-  std::string data_;
-
-  // The origin for which this token is valid. Must be a secure origin.
-  GURL origin_;
-
-  // The name of the experimental feature which this token enables.
-  std::string feature_name_;
-
-  // The time until which this token should be considered valid, in UTC, as
-  // seconds since the Unix epoch.
-  uint64_t expiry_timestamp_;
-};
-
-}  // namespace content
-
-#endif  // CONTENT_COMMON_ORIGIN_TRIALS_TRIAL_TOKEN_H_