study.proto

// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

syntax = "proto2";

option optimize_for = LITE_RUNTIME;
option java_package = "org.chromium.components.variations";

package variations;

import "layer.proto";

// This defines the Protocol Buffer representation of a Chrome Variations study
// as sent to clients of the Variations server.
//
// Next tag: 13
message Study {
  // The name of the study. Should not contain spaces or special characters.
  // Ex: "my_study"
  required string name = 1;

  // DEPRECATED: Prefer end_date instead.
  // The expiry date of the study in Unix time format. (Seconds since midnight
  // January 1, 1970 UTC). See: http://en.wikipedia.org/wiki/Unix_time
  //
  // A study that has expired will be disabled, and users will be assigned
  // groups based on the default_experiment_name. This will take precedence over
  // a corresponding hardcoded field trial in the client.
  //
  // Ex: 1330893974  (corresponds to 2012-03-04 20:46:14Z)
  optional int64 expiry_date = 3;

  // Consistency setting for a study.
  enum Consistency {
    SESSION = 0;  // Can't change within a session.
    PERMANENT = 1;  // Can't change for a given user.
  }

  // Consistency setting for this study. Optional - defaults to SESSION.
  // Ex: PERMANENT
  optional Consistency consistency = 7 [default = SESSION];

  // Optionally specifies which layer the study is a part of, which will
  // ensure only one study per layer is enabled for a client. A study must
  // specify both the ID of the layer and the ID of the LayerMember within
  // that layer that the study should be associated with.
  optional LayerMemberReference layer = 16;

  // Name of the experiment that gets the default experience. This experiment
  // must be included in the list below. If not specified, a generic default
  // experiment name is used.
  // Ex: "default"
  optional string default_experiment_name = 8;

  // Specifies under which conditions a |google_web_experiment_id| or
  // |google_web_trigger_experiment_id| is visible to Google web properties.
  enum GoogleWebVisibility {
    // Eligible requests to Google web properties include the experiment ID. See
    // AppendHeaderIfNeeded() in variations_http_headers.cc for eligibility
    // details.
    ANY = 0;

    // Only eligible requests initiated from a first-party context include the
    // experiment ID.
    //
    // The following requests are considered to be from a first-party context:
    // requests initiated by (i) the browser, (ii) a Chrome internal page,
    // (iii) a main frame with a Google-owned domain, and (iv) a subframe
    // whose associated main frame has a Google-owned domain. See
    // IsFirstPartyContext() in variations_http_headers.cc for more details.
    FIRST_PARTY = 1;
  }

  // An experiment within the study.
  //
  // Next tag: 17
  message Experiment {
    // A named parameter value for this experiment.
    //
    // Next tag: 3
    message Param {
      // The name of the parameter.
      optional string name = 1;

      // The value of the parameter.
      optional string value = 2;
    }

    // The name of the experiment within the study.
    // Ex: "bucketA"
    required string name = 1;

    // The cut of the total probability taken for this experiment (the x in
    // x / N, where N is the sum of all x’s).  Ex: "50"
    required uint32 probability_weight = 2;

    // Optional id used to uniquely identify this experiment for Google web
    // properties.
    optional uint64 google_web_experiment_id = 3;

    // Optional id used to allow this experiment to trigger experimental
    // behavior on Google web properties.
    optional uint64 google_web_trigger_experiment_id = 8;

    // Optional id that specifies under which conditions Google web and web
    // trigger experiment ids are visible to Google web properties.
    optional GoogleWebVisibility google_web_visibility = 16;

    // Optional id used to uniquely identify this experiment for Chrome Sync.
    optional uint64 chrome_sync_experiment_id = 10;

    // Optional id used to uniquely identify this experiment when activating
    // integrations with the Android Google App.
    // IMPORTANT: This field is only approved for integrations with the Android
    // Google App and must receive a privacy review before extending to other
    // apps.
    optional uint64 google_app_experiment_id = 15;

    // Specifies the feature association parameters for this experiment group.
    //
    // Next tag: 5
    message FeatureAssociation {
      // Optional list of features to enable when this experiment is selected.
      // Command-line overrides take precedence over this setting. No feature
      // listed here should exist in the |disable_feature| list.
      repeated string enable_feature = 1;

      // Optional list of features to disable when this experiment is selected.
      // Command-line overrides take precedence over this setting. No feature
      // listed here should exist in the |enable_feature| list.
      repeated string disable_feature = 2;

      // Similar to |forcing_flag|, this is an optional name of a feature which
      // will cause this experiment to be activated, if that feature is enabled
      // from the command-line. Experiment with this set are not eligible for
      // selection via a random dice roll.
      // Mutually exclusive with |forcing_flag|, |forcing_feature_off| or
      // having a non-zero |probability_weight|.
      optional string forcing_feature_on = 3;

      // Similar to |forcing_flag|, this is an optional name of a feature which
      // will cause this experiment to be activated, if that feature is disabled
      // from the command-line. Experiment with this set are not eligible for
      // selection via a random dice roll.
      // Mutually exclusive with |forcing_flag|, |forcing_feature_on| or having
      // a non-zero |probability_weight|.
      optional string forcing_feature_off = 4;
    }
    optional FeatureAssociation feature_association = 12;

    // Optional name of a Chrome flag that, when present, causes this experiment
    // to be forced. If the forcing_flag field is set, users will not be
    // assigned to this experiment unless that flag is present in Chrome's
    // command line.
    // Mutually exclusive with |forcing_feature_on|, |forcing_feature_off| or
    // having a non-zero |probability_weight|.
    optional string forcing_flag = 5;

    // Parameter values for this experiment.
    repeated Param param = 6;

    enum Type {
      // Regular experiment group. This is the default value and can be omitted.
      NORMAL = 0;

      // Changes to this experiment group are ignored for the purposes of
      // kill-switch triggering. Included to allow the flexibility to not
      // trigger this logic for specific cases (e.g. a group rename without
      // any functionality changes).
      IGNORE_CHANGE = 1;

      // This is a kill-switch group that should be killed at "best effort"
      // priority, e.g. with a hot dog menu badge. The experiment must have a
      // probability_weight of 0.
      KILL_BEST_EFFORT = 2;

      // This is a kill-switch group that should be killed with "critical"
      // priority. Depending on platform this may result in showing a
      // non-dismissible restart prompt with a timer. This should only be used
      // in very serious emergency circumstances. The experiment must have a
      // probability_weight of 0.
      KILL_CRITICAL = 3;
    }
    optional Type type = 7 [default = NORMAL];

    // A UI string to override, and the new value to use.
    message OverrideUIString {
      // The first 32 bits of the MD5 hash digest of the resource name to
      // override.
      // e.g. Hash("IDS_BOOKMARK_BAR_UNDO")
      optional fixed32 name_hash = 1;

      // The new value of the string being overridden.
      // e.g. "Undo"
      optional string value = 2;
    }
    repeated OverrideUIString override_ui_string = 9;
  }

  // List of experiments in this study. This list should include the default /
  // control experiment.
  //
  // For example, to specify that 99% of users get the default behavior, while
  // 0.5% of users get experience "A" and 0.5% of users get experience "B",
  // specify the values below.
  // Ex: { "default": 990, "A": 5, "B": 5 }
  repeated Experiment experiment = 9;

  // Possible Chrome release channels.
  // See: http://dev.chromium.org/getting-involved/dev-channel
  enum Channel {
    // UNKNOWN value is defined here for the benefit of code using this enum
    // type, but is not actually meant to be encoded in the protobuf.
    UNKNOWN = -1;
    CANARY = 0;
    DEV = 1;
    BETA = 2;
    STABLE = 3;
  }

  // Possible Chrome operating system platforms.
  // These names must match those in tools/variations/fieldtrial_to_struct.py.
  enum Platform {
    PLATFORM_WINDOWS = 0;
    PLATFORM_MAC = 1;
    PLATFORM_LINUX = 2;
    PLATFORM_CHROMEOS = 3;
    PLATFORM_ANDROID = 4;
    PLATFORM_IOS = 5;
    PLATFORM_ANDROID_WEBVIEW = 6;
    PLATFORM_FUCHSIA = 7;
    PLATFORM_ANDROID_WEBLAYER = 8;
    PLATFORM_CHROMEOS_LACROS = 9;
  }

  // Possible form factors Chrome is running on.
  enum FormFactor {
    // Chrome Desktop on Windows, Mac, Linux, or Chrome OS.
    DESKTOP = 0;
    // Phone-based mobile Chrome, e.g. an Android phone or iPhone.
    PHONE = 1;
    // Tablet-based mobile Chrome, e.g. an Android tablet or iPad.
    TABLET = 2;
    // Chrome OS running in single-app Kiosk mode.
    KIOSK = 3;
    // Chrome OS running on Meet Hardware devices e.g. Chromebox For Meetings.
    MEET_DEVICE = 4;
    // Chrome running on Android TV.
    TV = 5;
    // Chrome running on Android Auto.
    AUTOMOTIVE = 6;
    // Chrome running on Android Foldable.
    FOLDABLE = 7;
  }

  // Possible CPU architectures Chrome is running on. Only supported on M90+.
  enum CpuArchitecture {
    X86_64 = 0;
    ARM64 = 1;
    X86_32 = 2;
    ARM32 = 3;

    // A Mac-only value, indicating an x86-64 binary running on an arm64 host
    // via "Rosetta 2" binary translation.
    TRANSLATED_X86_64 = 4;
  }

  // Enum to pass as optional bool.
  enum OptionalBool {
    // Neither True nor False. (For cases like missing / unset / default etc.)
    OPTIONAL_BOOL_MISSING = 0;
    // Explicit True.
    OPTIONAL_BOOL_TRUE = 1;
    // Explicit False.
    OPTIONAL_BOOL_FALSE = 2;
  }

  // Possible states of the severity filter.
  enum PolicyRestriction {
    // No restriction configs apply to clients that do not have a
    // "ChromeVariations" policy set or if it is set to the variations enabled
    // value.
    NONE = 0;
    // Critical studies apply to both clients that have all variations enabled
    // or if the "ChromeVariations" policy is set to only allow critical
    // variations.
    CRITICAL = 1;
    // Critical-only studies apply *only* to clients that have the
    // "ChromeVariations" policy set to only allow critical variations.
    CRITICAL_ONLY = 2;
  }

  // Filtering criteria specifying whether this study is applicable to a given
  // Chrome instance.
  //
  // Next tag: 24
  message Filter {
    // The start date of the study in Unix time format. (Seconds since midnight
    // January 1, 1970 UTC). See: http://en.wikipedia.org/wiki/Unix_time
    // Ex: 1330893974  (corresponds to 2012-03-04 20:46:14Z)
    optional int64 start_date = 1;

    // The end date of the study in Unix time format. (Seconds since midnight
    // January 1, 1970 UTC). See: http://en.wikipedia.org/wiki/Unix_time
    // Ex: 1330893974  (corresponds to 2012-03-04 20:46:14Z)
    // Mutually exclusive with expiry_date. The difference between end_date and
    // expiry_date is that, when end_date is past, the field trial will not be
    // created. When expiry_date is past, the trial is still created, but will
    // be disabled, causing it to select its default group.
    optional int64 end_date = 13;

    // The minimum Chrome version for this study, allowing a trailing '*'
    // character for pattern matching. Inclusive. (To check for a match, iterate
    // over each component checking >= until a * or end of string is reached.)
    // Optional - if not specified, there is no minimum version.
    // Ex: "17.0.963.46", "17.0.963.*", "17.*"
    optional string min_version = 2;

    // The maximum Chrome version for this study; same formatting as
    // |min_version| above. Inclusive. (To check for a match, iterate over each
    // component checking <= until a * or end of string is reached.)
    // Optional - if not specified, there is no maximum version.
    // Ex: "19.*"
    optional string max_version = 3;

    // The minimum OS version for this study, allowing a trailing '*' character
    // for pattern matching. Inclusive. (To check for a match, iterate over each
    // component checking >= until a * or end of string is reached.) OS versions
    // are sanitized into a list of digits separated by dots like so:
    //  Windows:  "6.2.7601 SP1"      --> "6.2.7601.1"
    //  Mac OS X: "10.11.2"           --> "10.11.2"
    //  Linux:    "4.13.0-27-generic" --> "4.13.0"
    // Optional - if not specified, there is no minimum version.
    optional string min_os_version = 16;

    // The maximum OS version for this study, allowing a trailing '*' character
    // for pattern matching. Inclusive. (To check for a match, iterate over each
    // component checking <= until a * or end of string is reached.)
    // Optional - if not specified, there is no minimum version.
    // Ex: See |min_os_version| for details.
    optional string max_os_version = 17;

    // List of channels that will receive this study. If omitted, the study
    // applies to all channels.
    // Ex: [BETA, STABLE]
    repeated Channel channel = 4;

    // List of platforms that will receive this study. If omitted, the study
    // applies to all platforms.
    // Ex: [PLATFORM_WINDOWS, PLATFORM_MAC]
    repeated Platform platform = 5;

    // List of locales that will receive this study. If omitted, the study
    // applies to all locales, unless |exclude_locale| is specified. Mutually
    // exclusive with |exclude_locale|.
    // Ex: ["en-US", "en-CA"]
    repeated string locale = 6;

    // List of locales that will be excluded from this study. If omitted, the
    // study applies to all locales unless |locale| is specified. Mutually
    // exclusive with |locale|.
    // Ex: ["en-US", "en-CA"]
    repeated string exclude_locale = 12;

    // List of form factors that will receive this study. If omitted, the study
    // applies to all form factors, unless |exclude_form_factor| is specified.
    // Mutually exclusive with |exclude_form_factor|.
    // Ex: [PHONE, TABLET]
    repeated FormFactor form_factor = 7;

    // List of form factors that will be excluded from this study. If omitted,
    // the study applies to all form factors unless |form_factor| is specified.
    // Mutually exclusive with |form_factor|.
    // Takes the same range of values as form_factor, e.g. [PHONE, TABLET].
    repeated FormFactor exclude_form_factor = 14;

    // List of hardware classes that will receive this study.
    // This supports Chrome OS and as of M77, Android.
    //
    // Starting with Chrome M67, this does a case insensitive match on the same
    // hardware class field that is reported to UMA in the SystemProfileProto's
    // |hardware.hardware_class| field.
    //
    // Older versions did a case sensitive substring comparison, which was
    // problematic for short hardware classes like "eve" that existed as
    // substrings of other longer ones.
    //
    // If omitted, the study applies to all hardware classes unless
    // |exclude_hardware_class| is specified. Mutually exclusive with
    // |exclude_hardware_class|.
    // Ex: ["veyron_minnie", "daisy"]
    repeated string hardware_class = 8;

    // List of hardware classes that will be excluded in this study.
    // This supports Chrome OS and as of M77, Android.
    //
    // Starting with Chrome M67, this does a case insensitive match on the same
    // hardware class field that is reported to UMA in the SystemProfileProto's
    // |hardware.hardware_class| field.
    //
    // Older versions did a case sensitive substring comparison, which was
    // problematic for short hardware classes like "eve" that existed as
    // substrings of other longer ones.
    //
    // If omitted, the study applies to all hardware classes unless
    // |hardware_class| is specified. Mutually exclusive with |hardware_class|.
    // Ex: ["veyron_minnie", "daisy"]
    repeated string exclude_hardware_class = 9;

    // List of lowercase ISO 3166-1 alpha-2 country codes that will receive this
    // study. If omitted, the study applies to all countries unless
    // |exclude_country| is specified. Mutually exclusive with
    // |exclude_country|.
    // Ex: ["in", "us"]
    repeated string country = 10;

    // List of lowercase ISO 3166-1 alpha-2 country codes that will be excluded
    // from this study. If omitted, the study applies to all countries unless
    // |country| is specified. Mutually exclusive with |country|.
    // Ex: ["in", "us"]
    repeated string exclude_country = 11;

    // Specifies whether the config should apply to low-end devices only. This
    // is currently only supported on Android.
    optional bool is_low_end_device = 15;

    // Specifies whether the config should apply to enterprise or non-enterprise
    // only. If omitted, the config applies to both groups.
    // - On windows and mac, machines on a domain network are considered
    //   enterprise.
    // - On chromeOS, registered mode determines enterprise status.
    // - Android, iOS, and linux consider all clients as non-enterprise.
    optional bool is_enterprise = 18;

    // Specifies the restrictions applied by the "ChromeVariations" policy to
    // the study. See the definition of the PolicyRestriction enum for details.
    optional PolicyRestriction policy_restriction = 19 [default = NONE];

    // List of CPU architectures that will receive this study. If omitted, the
    // study applies to all architectures, unless |exclude_cpu_architecture| is
    // specified. Mutually exclusive with |exclude_cpu_architecture|. Ex:
    // [X86_32, ARM64]
    repeated CpuArchitecture cpu_architecture = 20;

    // List of CPU architectures that will be excluded from this study. If
    // omitted, the study applies to all architectures unless |cpu_architecture|
    // is specified. Mutually exclusive with |cpu_architecture|. Takes the same
    // range of values as cpu_architecture, e.g. [X86_32, ARM64].
    repeated CpuArchitecture exclude_cpu_architecture = 21;

    // Specifies that the config should apply only to clients where at least
    // one of the signed in users is a member of at least one of the specified
    // groups.
    // The values are the gaia ID of the google group.
    // Mutually exclusive with |exclude_google_group|.
    repeated int64 google_group = 22 [packed = true];

    // Specifies that the config should apply only to clients where none
    // of the signed in users are a member of any of the specified groups.
    // The values are the gaia ID of the google group.
    // Mutually exclusive with |google_group|.
    repeated int64 exclude_google_group = 23 [packed = true];
  }

  // Filtering criteria for this study. A study that is filtered out for a given
  // client is equivalent to that study not being sent at all.
  optional Filter filter = 10;

  // Randomization seed to be used when |consistency| is set to PERMANENT. If
  // not specified, randomization will be done using the trial name.
  optional uint32 randomization_seed = 11;

  // Specifies whether the study starts as active initially, or whether it
  // requires the client to query its state before it is marked as active.
  enum ActivationType {
    // The study will be activated when its state is queried by the client.
    // This is recommended for most studies that include client code.
    ACTIVATE_ON_QUERY = 0;
    // The study will be automatically activated when it is created. This
    // is recommended for studies that do not have any client logic.
    ACTIVATE_ON_STARTUP = 1;
  }

  // Activation type for this study. Defaults to ACTIVATE_ON_QUERY if omitted.
  optional ActivationType activation_type = 12;
}