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// Copyright (c) 2012 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 <stddef.h>
#include <string>
#include <vector>
#include "base/macros.h"
#include "net/base/net_export.h"
#include "net/cookies/cookie_constants.h"
namespace net {
class NET_EXPORT ParsedCookie {
typedef std::pair<std::string, std::string> TokenValuePair;
typedef std::vector<TokenValuePair> PairList;
// The maximum length of a cookie string we will try to parse
static const size_t kMaxCookieSize = 4096;
// The maximum number of Token/Value pairs. Shouldn't have more than 8.
static const int kMaxPairs = 16;
// Construct from a cookie string like "BLAH=1; path=/;"
// Format is according to RFC 6265. Cookies with both name and value empty
// will be considered invalid.
ParsedCookie(const std::string& cookie_line);
// You should not call any other methods except for SetName/SetValue on the
// class if !IsValid.
bool IsValid() const;
const std::string& Name() const { return pairs_[0].first; }
const std::string& Token() const { return Name(); }
const std::string& Value() const { return pairs_[0].second; }
bool HasPath() const { return path_index_ != 0; }
const std::string& Path() const { return pairs_[path_index_].second; }
bool HasDomain() const { return domain_index_ != 0; }
const std::string& Domain() const { return pairs_[domain_index_].second; }
bool HasExpires() const { return expires_index_ != 0; }
const std::string& Expires() const { return pairs_[expires_index_].second; }
bool HasMaxAge() const { return maxage_index_ != 0; }
const std::string& MaxAge() const { return pairs_[maxage_index_].second; }
bool IsSecure() const { return secure_index_ != 0; }
bool IsHttpOnly() const { return httponly_index_ != 0; }
CookieSameSite SameSite() const;
CookiePriority Priority() const;
// Returns the number of attributes, for example, returning 2 for:
// "BLAH=hah; path=/;"
size_t NumberOfAttributes() const { return pairs_.size() - 1; }
// These functions set the respective properties of the cookie. If the
// parameters are empty, the respective properties are cleared.
// The functions return false in case an error occurred.
// The cookie needs to be assigned a name/value before setting the other
// attributes.
bool SetName(const std::string& name);
bool SetValue(const std::string& value);
bool SetPath(const std::string& path);
bool SetDomain(const std::string& domain);
bool SetExpires(const std::string& expires);
bool SetMaxAge(const std::string& maxage);
bool SetIsSecure(bool is_secure);
bool SetIsHttpOnly(bool is_http_only);
bool SetSameSite(const std::string& same_site);
bool SetPriority(const std::string& priority);
// Returns the cookie description as it appears in a HTML response header.
std::string ToCookieLine() const;
// Returns an iterator pointing to the first terminator character found in
// the given string.
static std::string::const_iterator FindFirstTerminator(const std::string& s);
// Given iterators pointing to the beginning and end of a string segment,
// returns as output arguments token_start and token_end to the start and end
// positions of a cookie attribute token name parsed from the segment, and
// updates the segment iterator to point to the next segment to be parsed.
// If no token is found, the function returns false and the segment iterator
// is set to end.
static bool ParseToken(std::string::const_iterator* it,
const std::string::const_iterator& end,
std::string::const_iterator* token_start,
std::string::const_iterator* token_end);
// Given iterators pointing to the beginning and end of a string segment,
// returns as output arguments value_start and value_end to the start and end
// positions of a cookie attribute value parsed from the segment, and updates
// the segment iterator to point to the next segment to be parsed.
static void ParseValue(std::string::const_iterator* it,
const std::string::const_iterator& end,
std::string::const_iterator* value_start,
std::string::const_iterator* value_end);
// Same as the above functions, except the input is assumed to contain the
// desired token/value and nothing else.
static std::string ParseTokenString(const std::string& token);
static std::string ParseValueString(const std::string& value);
void ParseTokenValuePairs(const std::string& cookie_line);
void SetupAttributes();
// Sets a key/value pair for a cookie. |index| has to point to one of the
// |*_index_| fields in ParsedCookie and is updated to the position where
// the key/value pair is set in |pairs_|. Accordingly, |key| has to correspond
// to the token matching |index|. If |value| contains invalid characters, the
// cookie parameter is not changed and the function returns false.
// If |value| is empty/false the key/value pair is removed.
bool SetString(size_t* index,
const std::string& key,
const std::string& value);
bool SetBool(size_t* index, const std::string& key, bool value);
// Helper function for SetString and SetBool handling the case that the
// key/value pair shall not be removed.
bool SetAttributePair(size_t* index,
const std::string& key,
const std::string& value);
// Removes the key/value pair from a cookie that is identified by |index|.
// |index| refers to a position in |pairs_|.
void ClearAttributePair(size_t index);
// Returns false if a 'SameSite' attribute is present, but has an unrecognized
// value. In particular, this includes attributes with empty values.
bool IsSameSiteAttributeValid() const;
PairList pairs_;
// These will default to 0, but that should never be valid since the
// 0th index is the user supplied token/value, not an attribute.
// We're really never going to have more than like 8 attributes, so we
// could fit these into 3 bits each if we're worried about size...
size_t path_index_;
size_t domain_index_;
size_t expires_index_;
size_t maxage_index_;
size_t secure_index_;
size_t httponly_index_;
size_t same_site_index_;
size_t priority_index_;
} // namespace net