// Copyright 2017 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.

module network.mojom;

import "components/content_settings/core/common/content_settings.mojom";
import "mojo/public/mojom/base/time.mojom";
import "url/mojom/url.mojom";

// Parameters for constructing a cookie manager.
struct CookieManagerParams {
  // Whether or not third party cookies should be blocked.
  bool block_third_party_cookies = false;

  // Content settings for cookies.
  array<content_settings.mojom.ContentSettingPatternSource> settings;
};

enum CookiePriority {
  LOW,
  MEDIUM,
  HIGH
};

// See https://tools.ietf.org/html/draft-ietf-httpbis-cookie-same-site-00
// and https://tools.ietf.org/html/draft-ietf-httpbis-rfc6265bis for
// information about same site cookie restrictions.
enum CookieSameSite {
  NO_RESTRICTION,
  LAX_MODE,
  STRICT_MODE
};

enum CookieSameSiteFilter {
  INCLUDE_STRICT_AND_LAX,
  INCLUDE_LAX,
  DO_NOT_INCLUDE
};

// Keep defaults here in sync with net/cookies/cookie_options.cc.
struct CookieOptions {
  bool exclude_httponly = true;
  CookieSameSiteFilter cookie_same_site_filter = DO_NOT_INCLUDE;
  bool update_access_time = true;
  // TODO(rdsmith): Remove this element from the mojo structure?  It's only
  // used in the underlying net:: structure in CanonicalCookie::Create().
  mojo_base.mojom.Time? server_time;
};

// See net/cookies/canonical_cookie.{h,cc} for documentation.
// Keep defaults here in sync with those files.
struct CanonicalCookie {
  string name;
  string value;
  string domain;
  string path;
  mojo_base.mojom.Time creation;
  mojo_base.mojom.Time expiry;
  mojo_base.mojom.Time last_access;
  bool secure = false;
  bool httponly = false;
  CookieSameSite site_restrictions = NO_RESTRICTION;
  CookiePriority priority = MEDIUM;
};

// Keep values here in sync with net::CookieStore::ChangeCause.
// (Not typemapped to avoid forcing clients to know about net::CookieStore.)
enum CookieChangeCause {
  // The cookie was inserted.
  INSERTED,
  // The cookie was changed directly by a consumer's action.
  EXPLICIT,
  // The cookie was deleted, but no more details are known.
  UNKNOWN_DELETION,
  // The cookie was automatically removed due to an insert operation that
  // overwrote it.
  OVERWRITE,
  // The cookie was automatically removed as it expired.
  EXPIRED,
  // The cookie was automatically evicted during garbage collection.
  EVICTED,
  // The cookie was overwritten with an already-expired expiration date.
  EXPIRED_OVERWRITE
};

// Session cookies are cookies that expire at the end of the browser session.
// That is represented in canonical cookies by a null expiry time.
enum CookieDeletionSessionControl {
  IGNORE_CONTROL,
  SESSION_COOKIES,
  PERSISTENT_COOKIES,
};

// All existing filters are ANDed together.  I.e. if there is a value for
// created_after_time and there's a value for including_domains, only cookies
// in including_domains that have been created after the specified date would be
// deleted.  A value for session_control of IGNORE_CONTROL is treated the same
// as optional values not being present for the other filters.
// If no filters are specified then all cookies will be deleted; this can be
// thought of as there being a default "match everything" filter which is
// ANDed in with all other filters.
//
// Note that whether a domain matches a cookie or not is somewhat nuanced.  For
// the purposes of this filter:
//      * The host/domain cookie distinction is ignored
//      * A cookies effective domain is considered to be the top level registry
//        (including private registries) for the domain stored in the cookie
//        + the next entry down.  So the effective domain for x.y.google.com
//        would be google.com, and the effective domain for x.google.co.uk would
//        be google.co.uk.  See the function
//        net::registry_controlled_domains::GetDomainAndRegistry for more
//        details.
//      * If a cookie does not have such a top level domain (e.g. IP address
//        or private hostname), the domain specified in the cookie (the IP
//        address or private hostname) is used.
struct CookieDeletionFilter {
  // Delete cookies created after a date.
  mojo_base.mojom.Time? created_after_time;

  // Delete cookies created before a date.
  mojo_base.mojom.Time? created_before_time;

  // Delete cookies whose domains are not listed.
  array<string>? excluding_domains;

  // Deletes cookies whose domains are listed.
  array<string>? including_domains;

  // Delete cookies with a particular name.
  string? cookie_name;

  // Delete cookies from a particular host.
  string? host_name;

  // Delete cookies which match the given URL.
  // See https://tools.ietf.org/html/rfc6265, sections 5.1.{3,4} & 5.2.{5,6}
  // for matching rules.  In general terms, secure cookies only match
  // https URLs, the domain must match (the cookie domain must be a suffix
  // of the URL domain), and the path must match (the cookie path must
  // be a prefix of the URL path).  So
  // a cookie with {domain: ".sub.example.com", path: "/path", secure}
  // would be deleted if the URL passed was
  // "https://www.sub.example.com/path/path2" but not if it was
  // "http://www.example.com/x"--in fact, that cookie wouldn't be deleted
  // if any of the secure/domain/path attributes in the URL were changed.
  url.mojom.Url? url;

  // Delete session/persistent cookies.
  CookieDeletionSessionControl session_control = IGNORE_CONTROL;
};

interface CookieChangeListener {
  // TODO(rdsmith): Should this be made a batch interface?
  OnCookieChange(CanonicalCookie cookie, CookieChangeCause cause);
};

interface CookieManager {
  // TODO(rdsmith): Worthwhile specifying a sort order for the getters?

  // Get all the cookies known to the service.
  // Returned cookie list is sorted first by path length (longest first)
  // and second by creation time.
  // TODO(rdsmith): There are consumers that rely on this behavior, but
  // for this function it doesn't make a lot of sense not to also sort
  // on origin.  Should the returned cookies also be sorted by origin?
  GetAllCookies() => (array<CanonicalCookie> cookies);

  // Get all cookies for the specified URL and cookie options.
  // Returned cookie list is sorted first by path length (longest first)
  // and second by creation time.
  GetCookieList(url.mojom.Url url, CookieOptions cookie_options) =>
      (array<CanonicalCookie> cookies);

  // Set a cookie.  |secure_source| indicates whether existing secure
  // cookies can be overwritten (secure cookies may be created from a
  // non-secure source).  |modify_http_only| indicates whether http_only
  // cookies may be overwritten.
  SetCanonicalCookie(
      CanonicalCookie cookie, bool secure_source, bool modify_http_only) =>
      (bool success);

  // Delete a cookie. Returns true if a cookie was deleted.
  DeleteCanonicalCookie(CanonicalCookie cookie) => (bool success);

  // Delete a set of cookies matching the passed filter.
  // Returns the number of cookies deleted.
  DeleteCookies(CookieDeletionFilter filter) => (uint32 num_deleted);

  // Subscribes the given listener to changes to a cookie.
  //
  // The subscription is canceled by closing the CookieChangeListener's pipe.
  //
  // Note that if the caller may be racing with other uses of the cookie store,
  // it should follow the subscription request with a probe of the relevant
  // information about the tracked cookie, to make sure that a change to the
  // cookie did not happen right before the listener was registered.
  //
  // TODO(rdsmith): Should this have a filter to register for a lot of
  // notifications at once?  Maybe combine with the deletion filter?
  // TODO(rdsmith): Describe the performance implications of using this meethod.
  // The comments in CookieMonster::AddCallbackForCookie look pretty scary.
  AddCookieChangeListener(
      url.mojom.Url url,
      string name,
      CookieChangeListener listener);

  // Subscribes the given listener to changes to this CookieManager's cookies.
  //
  // The subscription is canceled by closing the CookieChangeListener's pipe.
  //
  // TODO(rdsmith): Should this have a filter to register for a lot of
  // notifications at once?  Maybe combine with the deletion filter?
  AddGlobalChangeListener(CookieChangeListener notification_pointer);

  // Clone the interface for use somewhere else.  After this call,
  // requests to the same implementation may be posted to the other side
  // of the pipe new_interface was configured on.
  CloneInterface(CookieManager& new_interface);

  // Flush the backing store (if any) to disk.
  FlushCookieStore() => ();

  // Sets content settings for cookies. These are used to determine cookie
  // access and cookie deletion behavior.
  SetContentSettings(
      array<content_settings.mojom.ContentSettingPatternSource> settings);

  // Instructs the cookie store to not discard session only cookies on shutdown.
  SetForceKeepSessionState();

  // Enables/Disables blocking of third-party cookies.
  BlockThirdPartyCookies(bool block);
};