xref: /aosp_15_r20/external/googleapis/google/storage/v2/storage.proto (revision d5c09012810ac0c9f33fe448fb6da8260d444cc9)

// Copyright 2023 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

syntax = "proto3";

package google.storage.v2;

import "google/api/client.proto";
import "google/api/field_behavior.proto";
import "google/api/resource.proto";
import "google/api/routing.proto";
import "google/iam/v1/iam_policy.proto";
import "google/iam/v1/policy.proto";
import "google/protobuf/duration.proto";
import "google/protobuf/empty.proto";
import "google/protobuf/field_mask.proto";
import "google/protobuf/timestamp.proto";
import "google/type/date.proto";

option go_package = "cloud.google.com/go/storage/internal/apiv2/storagepb;storagepb";
option java_multiple_files = true;
option java_outer_classname = "StorageProto";
option java_package = "com.google.storage.v2";
option (google.api.resource_definition) = {
  type: "cloudkms.googleapis.com/CryptoKey"
  pattern: "projects/{project}/locations/{location}/keyRings/{key_ring}/cryptoKeys/{crypto_key}"
};

// ## API Overview and Naming Syntax
//
// The Cloud Storage gRPC API allows applications to read and write data through
// the abstractions of buckets and objects. For a description of these
// abstractions please see https://cloud.google.com/storage/docs.
//
// Resources are named as follows:
//   - Projects are referred to as they are defined by the Resource Manager API,
//     using strings like `projects/123456` or `projects/my-string-id`.
//   - Buckets are named using string names of the form:
//     `projects/{project}/buckets/{bucket}`
//     For globally unique buckets, `_` may be substituted for the project.
//   - Objects are uniquely identified by their name along with the name of the
//     bucket they belong to, as separate strings in this API. For example:
//
//       ReadObjectRequest {
//         bucket: 'projects/_/buckets/my-bucket'
//         object: 'my-object'
//       }
//     Note that object names can contain `/` characters, which are treated as
//     any other character (no special directory semantics).
service Storage {
  option (google.api.default_host) = "storage.googleapis.com";
  option (google.api.oauth_scopes) =
      "https://www.googleapis.com/auth/cloud-platform,"
      "https://www.googleapis.com/auth/cloud-platform.read-only,"
      "https://www.googleapis.com/auth/devstorage.full_control,"
      "https://www.googleapis.com/auth/devstorage.read_only,"
      "https://www.googleapis.com/auth/devstorage.read_write";

  // Permanently deletes an empty bucket.
  rpc DeleteBucket(DeleteBucketRequest) returns (google.protobuf.Empty) {
    option (google.api.routing) = {
      routing_parameters { field: "name" path_template: "{bucket=**}" }
    };
    option (google.api.method_signature) = "name";
  }

  // Returns metadata for the specified bucket.
  rpc GetBucket(GetBucketRequest) returns (Bucket) {
    option (google.api.routing) = {
      routing_parameters { field: "name" path_template: "{bucket=**}" }
    };
    option (google.api.method_signature) = "name";
  }

  // Creates a new bucket.
  rpc CreateBucket(CreateBucketRequest) returns (Bucket) {
    option (google.api.routing) = {
      routing_parameters { field: "parent" path_template: "{project=**}" }
      routing_parameters {
        field: "bucket.project"
        path_template: "{project=**}"
      }
    };
    option (google.api.method_signature) = "parent,bucket,bucket_id";
  }

  // Retrieves a list of buckets for a given project.
  rpc ListBuckets(ListBucketsRequest) returns (ListBucketsResponse) {
    option (google.api.routing) = {
      routing_parameters { field: "parent" path_template: "{project=**}" }
    };
    option (google.api.method_signature) = "parent";
  }

  // Locks retention policy on a bucket.
  rpc LockBucketRetentionPolicy(LockBucketRetentionPolicyRequest)
      returns (Bucket) {
    option (google.api.routing) = {
      routing_parameters { field: "bucket" path_template: "{bucket=**}" }
    };
    option (google.api.method_signature) = "bucket";
  }

  // Gets the IAM policy for a specified bucket.
  // The `resource` field in the request should be
  // `projects/_/buckets/{bucket}`.
  rpc GetIamPolicy(google.iam.v1.GetIamPolicyRequest)
      returns (google.iam.v1.Policy) {
    option (google.api.routing) = {
      routing_parameters { field: "resource" path_template: "{bucket=**}" }
    };
    option (google.api.method_signature) = "resource";
  }

  // Updates an IAM policy for the specified bucket.
  // The `resource` field in the request should be
  // `projects/_/buckets/{bucket}`.
  rpc SetIamPolicy(google.iam.v1.SetIamPolicyRequest)
      returns (google.iam.v1.Policy) {
    option (google.api.routing) = {
      routing_parameters { field: "resource" path_template: "{bucket=**}" }
    };
    option (google.api.method_signature) = "resource,policy";
  }

  // Tests a set of permissions on the given bucket or object to see which, if
  // any, are held by the caller.
  // The `resource` field in the request should be
  // `projects/_/buckets/{bucket}` for a bucket or
  // `projects/_/buckets/{bucket}/objects/{object}` for an object.
  rpc TestIamPermissions(google.iam.v1.TestIamPermissionsRequest)
      returns (google.iam.v1.TestIamPermissionsResponse) {
    option (google.api.routing) = {
      routing_parameters { field: "resource" path_template: "{bucket=**}" }
      routing_parameters {
        field: "resource"
        path_template: "{bucket=projects/*/buckets/*}/objects/**"
      }
    };
    option (google.api.method_signature) = "resource,permissions";
  }

  // Updates a bucket. Equivalent to JSON API's storage.buckets.patch method.
  rpc UpdateBucket(UpdateBucketRequest) returns (Bucket) {
    option (google.api.routing) = {
      routing_parameters { field: "bucket.name" path_template: "{bucket=**}" }
    };
    option (google.api.method_signature) = "bucket,update_mask";
  }

  // Permanently deletes a NotificationConfig.
  rpc DeleteNotificationConfig(DeleteNotificationConfigRequest)
      returns (google.protobuf.Empty) {
    option (google.api.routing) = {
      routing_parameters {
        field: "name"
        path_template: "{bucket=projects/*/buckets/*}/**"
      }
    };
    option (google.api.method_signature) = "name";
  }

  // View a NotificationConfig.
  rpc GetNotificationConfig(GetNotificationConfigRequest)
      returns (NotificationConfig) {
    option (google.api.routing) = {
      routing_parameters {
        field: "name"
        path_template: "{bucket=projects/*/buckets/*}/**"
      }
    };
    option (google.api.method_signature) = "name";
  }

  // Creates a NotificationConfig for a given bucket.
  // These NotificationConfigs, when triggered, publish messages to the
  // specified Pub/Sub topics. See
  // https://cloud.google.com/storage/docs/pubsub-notifications.
  rpc CreateNotificationConfig(CreateNotificationConfigRequest)
      returns (NotificationConfig) {
    option (google.api.routing) = {
      routing_parameters { field: "parent" path_template: "{bucket=**}" }
    };
    option (google.api.method_signature) = "parent,notification_config";
  }

  // Retrieves a list of NotificationConfigs for a given bucket.
  rpc ListNotificationConfigs(ListNotificationConfigsRequest)
      returns (ListNotificationConfigsResponse) {
    option (google.api.routing) = {
      routing_parameters { field: "parent" path_template: "{bucket=**}" }
    };
    option (google.api.method_signature) = "parent";
  }

  // Concatenates a list of existing objects into a new object in the same
  // bucket.
  rpc ComposeObject(ComposeObjectRequest) returns (Object) {
    option (google.api.routing) = {
      routing_parameters {
        field: "destination.bucket"
        path_template: "{bucket=**}"
      }
    };
  }

  // Deletes an object and its metadata.
  //
  // Deletions are normally permanent when versioning is disabled or whenever
  // the generation parameter is used. However, if soft delete is enabled for
  // the bucket, deleted objects can be restored using RestoreObject until the
  // soft delete retention period has passed.
  rpc DeleteObject(DeleteObjectRequest) returns (google.protobuf.Empty) {
    option (google.api.routing) = {
      routing_parameters { field: "bucket" path_template: "{bucket=**}" }
    };
    option (google.api.method_signature) = "bucket,object";
    option (google.api.method_signature) = "bucket,object,generation";
  }

  // Restores a soft-deleted object.
  rpc RestoreObject(RestoreObjectRequest) returns (Object) {
    option (google.api.routing) = {
      routing_parameters { field: "bucket" path_template: "{bucket=**}" }
    };
    option (google.api.method_signature) = "bucket,object,generation";
  }

  // Cancels an in-progress resumable upload.
  //
  // Any attempts to write to the resumable upload after cancelling the upload
  // will fail.
  //
  // The behavior for currently in progress write operations is not guaranteed -
  // they could either complete before the cancellation or fail if the
  // cancellation completes first.
  rpc CancelResumableWrite(CancelResumableWriteRequest)
      returns (CancelResumableWriteResponse) {
    option (google.api.routing) = {
      routing_parameters {
        field: "upload_id"
        path_template: "{bucket=projects/*/buckets/*}/**"
      }
    };
    option (google.api.method_signature) = "upload_id";
  }

  // Retrieves an object's metadata.
  rpc GetObject(GetObjectRequest) returns (Object) {
    option (google.api.routing) = {
      routing_parameters { field: "bucket" path_template: "{bucket=**}" }
    };
    option (google.api.method_signature) = "bucket,object";
    option (google.api.method_signature) = "bucket,object,generation";
  }

  // Reads an object's data.
  rpc ReadObject(ReadObjectRequest) returns (stream ReadObjectResponse) {
    option (google.api.routing) = {
      routing_parameters { field: "bucket" path_template: "{bucket=**}" }
    };
    option (google.api.method_signature) = "bucket,object";
    option (google.api.method_signature) = "bucket,object,generation";
  }

  // Updates an object's metadata.
  // Equivalent to JSON API's storage.objects.patch.
  rpc UpdateObject(UpdateObjectRequest) returns (Object) {
    option (google.api.routing) = {
      routing_parameters { field: "object.bucket" path_template: "{bucket=**}" }
    };
    option (google.api.method_signature) = "object,update_mask";
  }

  // Stores a new object and metadata.
  //
  // An object can be written either in a single message stream or in a
  // resumable sequence of message streams. To write using a single stream,
  // the client should include in the first message of the stream an
  // `WriteObjectSpec` describing the destination bucket, object, and any
  // preconditions. Additionally, the final message must set 'finish_write' to
  // true, or else it is an error.
  //
  // For a resumable write, the client should instead call
  // `StartResumableWrite()`, populating a `WriteObjectSpec` into that request.
  // They should then attach the returned `upload_id` to the first message of
  // each following call to `WriteObject`. If the stream is closed before
  // finishing the upload (either explicitly by the client or due to a network
  // error or an error response from the server), the client should do as
  // follows:
  //   - Check the result Status of the stream, to determine if writing can be
  //     resumed on this stream or must be restarted from scratch (by calling
  //     `StartResumableWrite()`). The resumable errors are DEADLINE_EXCEEDED,
  //     INTERNAL, and UNAVAILABLE. For each case, the client should use binary
  //     exponential backoff before retrying.  Additionally, writes can be
  //     resumed after RESOURCE_EXHAUSTED errors, but only after taking
  //     appropriate measures, which may include reducing aggregate send rate
  //     across clients and/or requesting a quota increase for your project.
  //   - If the call to `WriteObject` returns `ABORTED`, that indicates
  //     concurrent attempts to update the resumable write, caused either by
  //     multiple racing clients or by a single client where the previous
  //     request was timed out on the client side but nonetheless reached the
  //     server. In this case the client should take steps to prevent further
  //     concurrent writes (e.g., increase the timeouts, stop using more than
  //     one process to perform the upload, etc.), and then should follow the
  //     steps below for resuming the upload.
  //   - For resumable errors, the client should call `QueryWriteStatus()` and
  //     then continue writing from the returned `persisted_size`. This may be
  //     less than the amount of data the client previously sent. Note also that
  //     it is acceptable to send data starting at an offset earlier than the
  //     returned `persisted_size`; in this case, the service will skip data at
  //     offsets that were already persisted (without checking that it matches
  //     the previously written data), and write only the data starting from the
  //     persisted offset. Even though the data isn't written, it may still
  //     incur a performance cost over resuming at the correct write offset.
  //     This behavior can make client-side handling simpler in some cases.
  //   - Clients must only send data that is a multiple of 256 KiB per message,
  //     unless the object is being finished with `finish_write` set to `true`.
  //
  // The service will not view the object as complete until the client has
  // sent a `WriteObjectRequest` with `finish_write` set to `true`. Sending any
  // requests on a stream after sending a request with `finish_write` set to
  // `true` will cause an error. The client **should** check the response it
  // receives to determine how much data the service was able to commit and
  // whether the service views the object as complete.
  //
  // Attempting to resume an already finalized object will result in an OK
  // status, with a WriteObjectResponse containing the finalized object's
  // metadata.
  //
  // Alternatively, the BidiWriteObject operation may be used to write an
  // object with controls over flushing and the ability to fetch the ability to
  // determine the current persisted size.
  rpc WriteObject(stream WriteObjectRequest) returns (WriteObjectResponse) {}

  // Stores a new object and metadata.
  //
  // This is similar to the WriteObject call with the added support for
  // manual flushing of persisted state, and the ability to determine current
  // persisted size without closing the stream.
  //
  // The client may specify one or both of the `state_lookup` and `flush` fields
  // in each BidiWriteObjectRequest. If `flush` is specified, the data written
  // so far will be persisted to storage. If `state_lookup` is specified, the
  // service will respond with a BidiWriteObjectResponse that contains the
  // persisted size. If both `flush` and `state_lookup` are specified, the flush
  // will always occur before a `state_lookup`, so that both may be set in the
  // same request and the returned state will be the state of the object
  // post-flush. When the stream is closed, a BidiWriteObjectResponse will
  // always be sent to the client, regardless of the value of `state_lookup`.
  rpc BidiWriteObject(stream BidiWriteObjectRequest)
      returns (stream BidiWriteObjectResponse) {}

  // Retrieves a list of objects matching the criteria.
  rpc ListObjects(ListObjectsRequest) returns (ListObjectsResponse) {
    option (google.api.routing) = {
      routing_parameters { field: "parent" path_template: "{bucket=**}" }
    };
    option (google.api.method_signature) = "parent";
  }

  // Rewrites a source object to a destination object. Optionally overrides
  // metadata.
  rpc RewriteObject(RewriteObjectRequest) returns (RewriteResponse) {
    option (google.api.routing) = {
      routing_parameters { field: "source_bucket" }
      routing_parameters {
        field: "destination_bucket"
        path_template: "{bucket=**}"
      }
    };
  }

  // Starts a resumable write. How long the write operation remains valid, and
  // what happens when the write operation becomes invalid, are
  // service-dependent.
  rpc StartResumableWrite(StartResumableWriteRequest)
      returns (StartResumableWriteResponse) {
    option (google.api.routing) = {
      routing_parameters {
        field: "write_object_spec.resource.bucket"
        path_template: "{bucket=**}"
      }
    };
  }

  // Determines the `persisted_size` for an object that is being written, which
  // can then be used as the `write_offset` for the next `Write()` call.
  //
  // If the object does not exist (i.e., the object has been deleted, or the
  // first `Write()` has not yet reached the service), this method returns the
  // error `NOT_FOUND`.
  //
  // The client **may** call `QueryWriteStatus()` at any time to determine how
  // much data has been processed for this object. This is useful if the
  // client is buffering data and needs to know which data can be safely
  // evicted. For any sequence of `QueryWriteStatus()` calls for a given
  // object name, the sequence of returned `persisted_size` values will be
  // non-decreasing.
  rpc QueryWriteStatus(QueryWriteStatusRequest)
      returns (QueryWriteStatusResponse) {
    option (google.api.routing) = {
      routing_parameters {
        field: "upload_id"
        path_template: "{bucket=projects/*/buckets/*}/**"
      }
    };
    option (google.api.method_signature) = "upload_id";
  }

  // Retrieves the name of a project's Google Cloud Storage service account.
  rpc GetServiceAccount(GetServiceAccountRequest) returns (ServiceAccount) {
    option (google.api.routing) = {
      routing_parameters { field: "project" }
    };
    option (google.api.method_signature) = "project";
  }

  // Creates a new HMAC key for the given service account.
  rpc CreateHmacKey(CreateHmacKeyRequest) returns (CreateHmacKeyResponse) {
    option (google.api.routing) = {
      routing_parameters { field: "project" }
    };
    option (google.api.method_signature) = "project,service_account_email";
  }

  // Deletes a given HMAC key.  Key must be in an INACTIVE state.
  rpc DeleteHmacKey(DeleteHmacKeyRequest) returns (google.protobuf.Empty) {
    option (google.api.routing) = {
      routing_parameters { field: "project" }
    };
    option (google.api.method_signature) = "access_id,project";
  }

  // Gets an existing HMAC key metadata for the given id.
  rpc GetHmacKey(GetHmacKeyRequest) returns (HmacKeyMetadata) {
    option (google.api.routing) = {
      routing_parameters { field: "project" }
    };
    option (google.api.method_signature) = "access_id,project";
  }

  // Lists HMAC keys under a given project with the additional filters provided.
  rpc ListHmacKeys(ListHmacKeysRequest) returns (ListHmacKeysResponse) {
    option (google.api.routing) = {
      routing_parameters { field: "project" }
    };
    option (google.api.method_signature) = "project";
  }

  // Updates a given HMAC key state between ACTIVE and INACTIVE.
  rpc UpdateHmacKey(UpdateHmacKeyRequest) returns (HmacKeyMetadata) {
    option (google.api.routing) = {
      routing_parameters {
        field: "hmac_key.project"
        path_template: "{project=**}"
      }
    };
    option (google.api.method_signature) = "hmac_key,update_mask";
  }
}

// Request message for DeleteBucket.
message DeleteBucketRequest {
  // Required. Name of a bucket to delete.
  string name = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = { type: "storage.googleapis.com/Bucket" }
  ];

  // If set, only deletes the bucket if its metageneration matches this value.
  optional int64 if_metageneration_match = 2;

  // If set, only deletes the bucket if its metageneration does not match this
  // value.
  optional int64 if_metageneration_not_match = 3;
}

// Request message for GetBucket.
message GetBucketRequest {
  // Required. Name of a bucket.
  string name = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = { type: "storage.googleapis.com/Bucket" }
  ];

  // If set, and if the bucket's current metageneration does not match the
  // specified value, the request will return an error.
  optional int64 if_metageneration_match = 2;

  // If set, and if the bucket's current metageneration matches the specified
  // value, the request will return an error.
  optional int64 if_metageneration_not_match = 3;

  // Mask specifying which fields to read.
  // A "*" field may be used to indicate all fields.
  // If no mask is specified, will default to all fields.
  optional google.protobuf.FieldMask read_mask = 5;
}

// Request message for CreateBucket.
message CreateBucketRequest {
  // Required. The project to which this bucket will belong.
  string parent = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {
      child_type: "storage.googleapis.com/Bucket"
    }
  ];

  // Properties of the new bucket being inserted.
  // The name of the bucket is specified in the `bucket_id` field. Populating
  // `bucket.name` field will result in an error.
  // The project of the bucket must be specified in the `bucket.project` field.
  // This field must be in `projects/{projectIdentifier}` format,
  // {projectIdentifier} can be the project ID or project number. The `parent`
  // field must be either empty or `projects/_`.
  Bucket bucket = 2;

  // Required. The ID to use for this bucket, which will become the final
  // component of the bucket's resource name. For example, the value `foo` might
  // result in a bucket with the name `projects/123456/buckets/foo`.
  string bucket_id = 3 [(google.api.field_behavior) = REQUIRED];

  // Apply a predefined set of access controls to this bucket.
  // Valid values are "authenticatedRead", "private", "projectPrivate",
  // "publicRead", or "publicReadWrite".
  string predefined_acl = 6;

  // Apply a predefined set of default object access controls to this bucket.
  // Valid values are "authenticatedRead", "bucketOwnerFullControl",
  // "bucketOwnerRead", "private", "projectPrivate", or "publicRead".
  string predefined_default_object_acl = 7;
}

// Request message for ListBuckets.
message ListBucketsRequest {
  // Required. The project whose buckets we are listing.
  string parent = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {
      child_type: "storage.googleapis.com/Bucket"
    }
  ];

  // Maximum number of buckets to return in a single response. The service will
  // use this parameter or 1,000 items, whichever is smaller. If "acl" is
  // present in the read_mask, the service will use this parameter of 200 items,
  // whichever is smaller.
  int32 page_size = 2;

  // A previously-returned page token representing part of the larger set of
  // results to view.
  string page_token = 3;

  // Filter results to buckets whose names begin with this prefix.
  string prefix = 4;

  // Mask specifying which fields to read from each result.
  // If no mask is specified, will default to all fields except items.owner,
  // items.acl, and items.default_object_acl.
  // * may be used to mean "all fields".
  optional google.protobuf.FieldMask read_mask = 5;
}

// The result of a call to Buckets.ListBuckets
message ListBucketsResponse {
  // The list of items.
  repeated Bucket buckets = 1;

  // The continuation token, used to page through large result sets. Provide
  // this value in a subsequent request to return the next page of results.
  string next_page_token = 2;
}

// Request message for LockBucketRetentionPolicyRequest.
message LockBucketRetentionPolicyRequest {
  // Required. Name of a bucket.
  string bucket = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = { type: "storage.googleapis.com/Bucket" }
  ];

  // Required. Makes the operation conditional on whether bucket's current
  // metageneration matches the given value. Must be positive.
  int64 if_metageneration_match = 2 [(google.api.field_behavior) = REQUIRED];
}

// Request for UpdateBucket method.
message UpdateBucketRequest {
  // Required. The bucket to update.
  // The bucket's `name` field will be used to identify the bucket.
  Bucket bucket = 1 [(google.api.field_behavior) = REQUIRED];

  // If set, will only modify the bucket if its metageneration matches this
  // value.
  optional int64 if_metageneration_match = 2;

  // If set, will only modify the bucket if its metageneration does not match
  // this value.
  optional int64 if_metageneration_not_match = 3;

  // Apply a predefined set of access controls to this bucket.
  // Valid values are "authenticatedRead", "private", "projectPrivate",
  // "publicRead", or "publicReadWrite".
  string predefined_acl = 8;

  // Apply a predefined set of default object access controls to this bucket.
  // Valid values are "authenticatedRead", "bucketOwnerFullControl",
  // "bucketOwnerRead", "private", "projectPrivate", or "publicRead".
  string predefined_default_object_acl = 9;

  // Required. List of fields to be updated.
  //
  // To specify ALL fields, equivalent to the JSON API's "update" function,
  // specify a single field with the value `*`. Note: not recommended. If a new
  // field is introduced at a later time, an older client updating with the `*`
  // may accidentally reset the new field's value.
  //
  // Not specifying any fields is an error.
  google.protobuf.FieldMask update_mask = 6
      [(google.api.field_behavior) = REQUIRED];
}

// Request message for DeleteNotificationConfig.
message DeleteNotificationConfigRequest {
  // Required. The parent bucket of the NotificationConfig.
  string name = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {
      type: "storage.googleapis.com/NotificationConfig"
    }
  ];
}

// Request message for GetNotificationConfig.
message GetNotificationConfigRequest {
  // Required. The parent bucket of the NotificationConfig.
  // Format:
  // `projects/{project}/buckets/{bucket}/notificationConfigs/{notificationConfig}`
  string name = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {
      type: "storage.googleapis.com/NotificationConfig"
    }
  ];
}

// Request message for CreateNotificationConfig.
message CreateNotificationConfigRequest {
  // Required. The bucket to which this NotificationConfig belongs.
  string parent = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {
      child_type: "storage.googleapis.com/NotificationConfig"
    }
  ];

  // Required. Properties of the NotificationConfig to be inserted.
  NotificationConfig notification_config = 2
      [(google.api.field_behavior) = REQUIRED];
}

// Request message for ListNotifications.
message ListNotificationConfigsRequest {
  // Required. Name of a Google Cloud Storage bucket.
  string parent = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {
      child_type: "storage.googleapis.com/NotificationConfig"
    }
  ];

  // The maximum number of NotificationConfigs to return. The service may
  // return fewer than this value. The default value is 100. Specifying a value
  // above 100 will result in a page_size of 100.
  int32 page_size = 2;

  // A page token, received from a previous `ListNotificationConfigs` call.
  // Provide this to retrieve the subsequent page.
  //
  // When paginating, all other parameters provided to `ListNotificationConfigs`
  // must match the call that provided the page token.
  string page_token = 3;
}

// The result of a call to ListNotificationConfigs
message ListNotificationConfigsResponse {
  // The list of items.
  repeated NotificationConfig notification_configs = 1;

  // A token, which can be sent as `page_token` to retrieve the next page.
  // If this field is omitted, there are no subsequent pages.
  string next_page_token = 2;
}

// Request message for ComposeObject.
message ComposeObjectRequest {
  // Description of a source object for a composition request.
  message SourceObject {
    // Preconditions for a source object of a composition request.
    message ObjectPreconditions {
      // Only perform the composition if the generation of the source object
      // that would be used matches this value.  If this value and a generation
      // are both specified, they must be the same value or the call will fail.
      optional int64 if_generation_match = 1;
    }

    // Required. The source object's name. All source objects must reside in the
    // same bucket.
    string name = 1 [(google.api.field_behavior) = REQUIRED];

    // The generation of this object to use as the source.
    int64 generation = 2;

    // Conditions that must be met for this operation to execute.
    ObjectPreconditions object_preconditions = 3;
  }

  // Required. Properties of the resulting object.
  Object destination = 1 [(google.api.field_behavior) = REQUIRED];

  // The list of source objects that will be concatenated into a single object.
  repeated SourceObject source_objects = 2;

  // Apply a predefined set of access controls to the destination object.
  // Valid values are "authenticatedRead", "bucketOwnerFullControl",
  // "bucketOwnerRead", "private", "projectPrivate", or "publicRead".
  string destination_predefined_acl = 9;

  // Makes the operation conditional on whether the object's current generation
  // matches the given value. Setting to 0 makes the operation succeed only if
  // there are no live versions of the object.
  optional int64 if_generation_match = 4;

  // Makes the operation conditional on whether the object's current
  // metageneration matches the given value.
  optional int64 if_metageneration_match = 5;

  // Resource name of the Cloud KMS key, of the form
  // `projects/my-project/locations/my-location/keyRings/my-kr/cryptoKeys/my-key`,
  // that will be used to encrypt the object. Overrides the object
  // metadata's `kms_key_name` value, if any.
  string kms_key = 6 [(google.api.resource_reference) = {
    type: "cloudkms.googleapis.com/CryptoKey"
  }];

  // A set of parameters common to Storage API requests concerning an object.
  CommonObjectRequestParams common_object_request_params = 7;

  // The checksums of the complete object. This will be validated against the
  // combined checksums of the component objects.
  ObjectChecksums object_checksums = 10;
}

// Message for deleting an object.
// `bucket` and `object` **must** be set.
message DeleteObjectRequest {
  // Required. Name of the bucket in which the object resides.
  string bucket = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = { type: "storage.googleapis.com/Bucket" }
  ];

  // Required. The name of the finalized object to delete.
  // Note: If you want to delete an unfinalized resumable upload please use
  // `CancelResumableWrite`.
  string object = 2 [(google.api.field_behavior) = REQUIRED];

  // If present, permanently deletes a specific revision of this object (as
  // opposed to the latest version, the default).
  int64 generation = 4;

  // Makes the operation conditional on whether the object's current generation
  // matches the given value. Setting to 0 makes the operation succeed only if
  // there are no live versions of the object.
  optional int64 if_generation_match = 5;

  // Makes the operation conditional on whether the object's live generation
  // does not match the given value. If no live object exists, the precondition
  // fails. Setting to 0 makes the operation succeed only if there is a live
  // version of the object.
  optional int64 if_generation_not_match = 6;

  // Makes the operation conditional on whether the object's current
  // metageneration matches the given value.
  optional int64 if_metageneration_match = 7;

  // Makes the operation conditional on whether the object's current
  // metageneration does not match the given value.
  optional int64 if_metageneration_not_match = 8;

  // A set of parameters common to Storage API requests concerning an object.
  CommonObjectRequestParams common_object_request_params = 10;
}

// Message for restoring an object.
// `bucket`, `object`, and `generation` **must** be set.
message RestoreObjectRequest {
  // Required. Name of the bucket in which the object resides.
  string bucket = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = { type: "storage.googleapis.com/Bucket" }
  ];

  // Required. The name of the object to restore.
  string object = 2 [(google.api.field_behavior) = REQUIRED];

  // Required. The specific revision of the object to restore.
  int64 generation = 3 [(google.api.field_behavior) = REQUIRED];

  // Makes the operation conditional on whether the object's current generation
  // matches the given value. Setting to 0 makes the operation succeed only if
  // there are no live versions of the object.
  optional int64 if_generation_match = 4;

  // Makes the operation conditional on whether the object's live generation
  // does not match the given value. If no live object exists, the precondition
  // fails. Setting to 0 makes the operation succeed only if there is a live
  // version of the object.
  optional int64 if_generation_not_match = 5;

  // Makes the operation conditional on whether the object's current
  // metageneration matches the given value.
  optional int64 if_metageneration_match = 6;

  // Makes the operation conditional on whether the object's current
  // metageneration does not match the given value.
  optional int64 if_metageneration_not_match = 7;

  // If false or unset, the bucket's default object ACL will be used.
  // If true, copy the source object's access controls.
  // Return an error if bucket has UBLA enabled.
  optional bool copy_source_acl = 9;

  // A set of parameters common to Storage API requests concerning an object.
  CommonObjectRequestParams common_object_request_params = 8;
}

// Message for canceling an in-progress resumable upload.
// `upload_id` **must** be set.
message CancelResumableWriteRequest {
  // Required. The upload_id of the resumable upload to cancel. This should be
  // copied from the `upload_id` field of `StartResumableWriteResponse`.
  string upload_id = 1 [(google.api.field_behavior) = REQUIRED];
}

// Empty response message for canceling an in-progress resumable upload, will be
// extended as needed.
message CancelResumableWriteResponse {}

// Request message for ReadObject.
message ReadObjectRequest {
  // Required. The name of the bucket containing the object to read.
  string bucket = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = { type: "storage.googleapis.com/Bucket" }
  ];

  // Required. The name of the object to read.
  string object = 2 [(google.api.field_behavior) = REQUIRED];

  // If present, selects a specific revision of this object (as opposed
  // to the latest version, the default).
  int64 generation = 3;

  // The offset for the first byte to return in the read, relative to the start
  // of the object.
  //
  // A negative `read_offset` value will be interpreted as the number of bytes
  // back from the end of the object to be returned. For example, if an object's
  // length is 15 bytes, a ReadObjectRequest with `read_offset` = -5 and
  // `read_limit` = 3 would return bytes 10 through 12 of the object. Requesting
  // a negative offset with magnitude larger than the size of the object will
  // return the entire object.
  int64 read_offset = 4;

  // The maximum number of `data` bytes the server is allowed to return in the
  // sum of all `Object` messages. A `read_limit` of zero indicates that there
  // is no limit, and a negative `read_limit` will cause an error.
  //
  // If the stream returns fewer bytes than allowed by the `read_limit` and no
  // error occurred, the stream includes all data from the `read_offset` to the
  // end of the resource.
  int64 read_limit = 5;

  // Makes the operation conditional on whether the object's current generation
  // matches the given value. Setting to 0 makes the operation succeed only if
  // there are no live versions of the object.
  optional int64 if_generation_match = 6;

  // Makes the operation conditional on whether the object's live generation
  // does not match the given value. If no live object exists, the precondition
  // fails. Setting to 0 makes the operation succeed only if there is a live
  // version of the object.
  optional int64 if_generation_not_match = 7;

  // Makes the operation conditional on whether the object's current
  // metageneration matches the given value.
  optional int64 if_metageneration_match = 8;

  // Makes the operation conditional on whether the object's current
  // metageneration does not match the given value.
  optional int64 if_metageneration_not_match = 9;

  // A set of parameters common to Storage API requests concerning an object.
  CommonObjectRequestParams common_object_request_params = 10;

  // Mask specifying which fields to read.
  // The checksummed_data field and its children will always be present.
  // If no mask is specified, will default to all fields except metadata.owner
  // and metadata.acl.
  // * may be used to mean "all fields".
  optional google.protobuf.FieldMask read_mask = 12;
}

// Request message for GetObject.
message GetObjectRequest {
  // Required. Name of the bucket in which the object resides.
  string bucket = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = { type: "storage.googleapis.com/Bucket" }
  ];

  // Required. Name of the object.
  string object = 2 [(google.api.field_behavior) = REQUIRED];

  // If present, selects a specific revision of this object (as opposed to the
  // latest version, the default).
  int64 generation = 3;

  // If true, return the soft-deleted version of this object.
  optional bool soft_deleted = 11;

  // Makes the operation conditional on whether the object's current generation
  // matches the given value. Setting to 0 makes the operation succeed only if
  // there are no live versions of the object.
  optional int64 if_generation_match = 4;

  // Makes the operation conditional on whether the object's live generation
  // does not match the given value. If no live object exists, the precondition
  // fails. Setting to 0 makes the operation succeed only if there is a live
  // version of the object.
  optional int64 if_generation_not_match = 5;

  // Makes the operation conditional on whether the object's current
  // metageneration matches the given value.
  optional int64 if_metageneration_match = 6;

  // Makes the operation conditional on whether the object's current
  // metageneration does not match the given value.
  optional int64 if_metageneration_not_match = 7;

  // A set of parameters common to Storage API requests concerning an object.
  CommonObjectRequestParams common_object_request_params = 8;

  // Mask specifying which fields to read.
  // If no mask is specified, will default to all fields except metadata.acl and
  // metadata.owner.
  // * may be used to mean "all fields".
  optional google.protobuf.FieldMask read_mask = 10;
}

// Response message for ReadObject.
message ReadObjectResponse {
  // A portion of the data for the object. The service **may** leave `data`
  // empty for any given `ReadResponse`. This enables the service to inform the
  // client that the request is still live while it is running an operation to
  // generate more data.
  ChecksummedData checksummed_data = 1;

  // The checksums of the complete object. If the object is downloaded in full,
  // the client should compute one of these checksums over the downloaded object
  // and compare it against the value provided here.
  ObjectChecksums object_checksums = 2;

  // If read_offset and or read_limit was specified on the
  // ReadObjectRequest, ContentRange will be populated on the first
  // ReadObjectResponse message of the read stream.
  ContentRange content_range = 3;

  // Metadata of the object whose media is being returned.
  // Only populated in the first response in the stream.
  Object metadata = 4;
}

// Describes an attempt to insert an object, possibly over multiple requests.
message WriteObjectSpec {
  // Required. Destination object, including its name and its metadata.
  Object resource = 1 [(google.api.field_behavior) = REQUIRED];

  // Apply a predefined set of access controls to this object.
  // Valid values are "authenticatedRead", "bucketOwnerFullControl",
  // "bucketOwnerRead", "private", "projectPrivate", or "publicRead".
  string predefined_acl = 7;

  // Makes the operation conditional on whether the object's current
  // generation matches the given value. Setting to 0 makes the operation
  // succeed only if there are no live versions of the object.
  optional int64 if_generation_match = 3;

  // Makes the operation conditional on whether the object's live
  // generation does not match the given value. If no live object exists, the
  // precondition fails. Setting to 0 makes the operation succeed only if
  // there is a live version of the object.
  optional int64 if_generation_not_match = 4;

  // Makes the operation conditional on whether the object's current
  // metageneration matches the given value.
  optional int64 if_metageneration_match = 5;

  // Makes the operation conditional on whether the object's current
  // metageneration does not match the given value.
  optional int64 if_metageneration_not_match = 6;

  // The expected final object size being uploaded.
  // If this value is set, closing the stream after writing fewer or more than
  // `object_size` bytes will result in an OUT_OF_RANGE error.
  //
  // This situation is considered a client error, and if such an error occurs
  // you must start the upload over from scratch, this time sending the correct
  // number of bytes.
  optional int64 object_size = 8;
}

// Request message for WriteObject.
message WriteObjectRequest {
  // The first message of each stream should set one of the following.
  oneof first_message {
    // For resumable uploads. This should be the `upload_id` returned from a
    // call to `StartResumableWriteResponse`.
    string upload_id = 1;

    // For non-resumable uploads. Describes the overall upload, including the
    // destination bucket and object name, preconditions, etc.
    WriteObjectSpec write_object_spec = 2;
  }

  // Required. The offset from the beginning of the object at which the data
  // should be written.
  //
  // In the first `WriteObjectRequest` of a `WriteObject()` action, it
  // indicates the initial offset for the `Write()` call. The value **must** be
  // equal to the `persisted_size` that a call to `QueryWriteStatus()` would
  // return (0 if this is the first write to the object).
  //
  // On subsequent calls, this value **must** be no larger than the sum of the
  // first `write_offset` and the sizes of all `data` chunks sent previously on
  // this stream.
  //
  // An incorrect value will cause an error.
  int64 write_offset = 3 [(google.api.field_behavior) = REQUIRED];

  // A portion of the data for the object.
  oneof data {
    // The data to insert. If a crc32c checksum is provided that doesn't match
    // the checksum computed by the service, the request will fail.
    ChecksummedData checksummed_data = 4;
  }

  // Checksums for the complete object. If the checksums computed by the service
  // don't match the specified checksums the call will fail. May only be
  // provided in the first or last request (either with first_message, or
  // finish_write set).
  ObjectChecksums object_checksums = 6;

  // If `true`, this indicates that the write is complete. Sending any
  // `WriteObjectRequest`s subsequent to one in which `finish_write` is `true`
  // will cause an error.
  // For a non-resumable write (where the upload_id was not set in the first
  // message), it is an error not to set this field in the final message of the
  // stream.
  bool finish_write = 7;

  // A set of parameters common to Storage API requests concerning an object.
  CommonObjectRequestParams common_object_request_params = 8;
}

// Response message for WriteObject.
message WriteObjectResponse {
  // The response will set one of the following.
  oneof write_status {
    // The total number of bytes that have been processed for the given object
    // from all `WriteObject` calls. Only set if the upload has not finalized.
    int64 persisted_size = 1;

    // A resource containing the metadata for the uploaded object. Only set if
    // the upload has finalized.
    Object resource = 2;
  }
}

// Request message for BidiWriteObject.
message BidiWriteObjectRequest {
  // The first message of each stream should set one of the following.
  oneof first_message {
    // For resumable uploads. This should be the `upload_id` returned from a
    // call to `StartResumableWriteResponse`.
    string upload_id = 1;

    // For non-resumable uploads. Describes the overall upload, including the
    // destination bucket and object name, preconditions, etc.
    WriteObjectSpec write_object_spec = 2;
  }

  // Required. The offset from the beginning of the object at which the data
  // should be written.
  //
  // In the first `WriteObjectRequest` of a `WriteObject()` action, it
  // indicates the initial offset for the `Write()` call. The value **must** be
  // equal to the `persisted_size` that a call to `QueryWriteStatus()` would
  // return (0 if this is the first write to the object).
  //
  // On subsequent calls, this value **must** be no larger than the sum of the
  // first `write_offset` and the sizes of all `data` chunks sent previously on
  // this stream.
  //
  // An invalid value will cause an error.
  int64 write_offset = 3 [(google.api.field_behavior) = REQUIRED];

  // A portion of the data for the object.
  oneof data {
    // The data to insert. If a crc32c checksum is provided that doesn't match
    // the checksum computed by the service, the request will fail.
    ChecksummedData checksummed_data = 4;
  }

  // Checksums for the complete object. If the checksums computed by the service
  // don't match the specified checksums the call will fail. May only be
  // provided in the first or last request (either with first_message, or
  // finish_write set).
  ObjectChecksums object_checksums = 6;

  // For each BidiWriteObjectRequest where state_lookup is `true` or the client
  // closes the stream, the service will send a BidiWriteObjectResponse
  // containing the current persisted size. The persisted size sent in responses
  // covers all the bytes the server has persisted thus far and can be used to
  // decide what data is safe for the client to drop. Note that the object's
  // current size reported by the BidiWriteObjectResponse may lag behind the
  // number of bytes written by the client. This field is ignored if
  // `finish_write` is set to true.
  bool state_lookup = 7;

  // Persists data written on the stream, up to and including the current
  // message, to permanent storage. This option should be used sparingly as it
  // may reduce performance. Ongoing writes will periodically be persisted on
  // the server even when `flush` is not set. This field is ignored if
  // `finish_write` is set to true since there's no need to checkpoint or flush
  // if this message completes the write.
  bool flush = 8;

  // If `true`, this indicates that the write is complete. Sending any
  // `WriteObjectRequest`s subsequent to one in which `finish_write` is `true`
  // will cause an error.
  // For a non-resumable write (where the upload_id was not set in the first
  // message), it is an error not to set this field in the final message of the
  // stream.
  bool finish_write = 9;

  // A set of parameters common to Storage API requests concerning an object.
  CommonObjectRequestParams common_object_request_params = 10;
}

// Response message for BidiWriteObject.
message BidiWriteObjectResponse {
  // The response will set one of the following.
  oneof write_status {
    // The total number of bytes that have been processed for the given object
    // from all `WriteObject` calls. Only set if the upload has not finalized.
    int64 persisted_size = 1;

    // A resource containing the metadata for the uploaded object. Only set if
    // the upload has finalized.
    Object resource = 2;
  }
}

// Request message for ListObjects.
message ListObjectsRequest {
  // Required. Name of the bucket in which to look for objects.
  string parent = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = { type: "storage.googleapis.com/Bucket" }
  ];

  // Maximum number of `items` plus `prefixes` to return
  // in a single page of responses. As duplicate `prefixes` are
  // omitted, fewer total results may be returned than requested. The service
  // will use this parameter or 1,000 items, whichever is smaller.
  int32 page_size = 2;

  // A previously-returned page token representing part of the larger set of
  // results to view.
  string page_token = 3;

  // If set, returns results in a directory-like mode. `items` will contain
  // only objects whose names, aside from the `prefix`, do not
  // contain `delimiter`. Objects whose names, aside from the
  // `prefix`, contain `delimiter` will have their name,
  // truncated after the `delimiter`, returned in
  // `prefixes`. Duplicate `prefixes` are omitted.
  string delimiter = 4;

  // If true, objects that end in exactly one instance of `delimiter`
  // will have their metadata included in `items` in addition to
  // `prefixes`.
  bool include_trailing_delimiter = 5;

  // Filter results to objects whose names begin with this prefix.
  string prefix = 6;

  // If `true`, lists all versions of an object as distinct results.
  // For more information, see
  // [Object
  // Versioning](https://cloud.google.com/storage/docs/object-versioning).
  bool versions = 7;

  // Mask specifying which fields to read from each result.
  // If no mask is specified, will default to all fields except items.acl and
  // items.owner.
  // * may be used to mean "all fields".
  optional google.protobuf.FieldMask read_mask = 8;

  // Optional. Filter results to objects whose names are lexicographically equal
  // to or after lexicographic_start. If lexicographic_end is also set, the
  // objects listed have names between lexicographic_start (inclusive) and
  // lexicographic_end (exclusive).
  string lexicographic_start = 10 [(google.api.field_behavior) = OPTIONAL];

  // Optional. Filter results to objects whose names are lexicographically
  // before lexicographic_end. If lexicographic_start is also set, the objects
  // listed have names between lexicographic_start (inclusive) and
  // lexicographic_end (exclusive).
  string lexicographic_end = 11 [(google.api.field_behavior) = OPTIONAL];

  // Optional. If true, only list all soft-deleted versions of the object.
  // Soft delete policy is required to set this option.
  bool soft_deleted = 12 [(google.api.field_behavior) = OPTIONAL];

  // Optional. If true, will also include folders and managed folders (besides
  // objects) in the returned `prefixes`. Requires `delimiter` to be set to '/'.
  bool include_folders_as_prefixes = 13
      [(google.api.field_behavior) = OPTIONAL];

  // Optional. Filter results to objects and prefixes that match this glob
  // pattern. See [List Objects Using
  // Glob](https://cloud.google.com/storage/docs/json_api/v1/objects/list#list-objects-and-prefixes-using-glob)
  // for the full syntax.
  string match_glob = 14 [(google.api.field_behavior) = OPTIONAL];
}

// Request object for `QueryWriteStatus`.
message QueryWriteStatusRequest {
  // Required. The name of the resume token for the object whose write status is
  // being requested.
  string upload_id = 1 [(google.api.field_behavior) = REQUIRED];

  // A set of parameters common to Storage API requests concerning an object.
  CommonObjectRequestParams common_object_request_params = 2;
}

// Response object for `QueryWriteStatus`.
message QueryWriteStatusResponse {
  // The response will set one of the following.
  oneof write_status {
    // The total number of bytes that have been processed for the given object
    // from all `WriteObject` calls. This is the correct value for the
    // 'write_offset' field to use when resuming the `WriteObject` operation.
    // Only set if the upload has not finalized.
    int64 persisted_size = 1;

    // A resource containing the metadata for the uploaded object. Only set if
    // the upload has finalized.
    Object resource = 2;
  }
}

// Request message for RewriteObject.
// If the source object is encrypted using a Customer-Supplied Encryption Key
// the key information must be provided in the copy_source_encryption_algorithm,
// copy_source_encryption_key_bytes, and copy_source_encryption_key_sha256_bytes
// fields. If the destination object should be encrypted the keying information
// should be provided in the encryption_algorithm, encryption_key_bytes, and
// encryption_key_sha256_bytes fields of the
// common_object_request_params.customer_encryption field.
message RewriteObjectRequest {
  // Required. Immutable. The name of the destination object.
  // See the
  // [Naming Guidelines](https://cloud.google.com/storage/docs/objects#naming).
  // Example: `test.txt`
  // The `name` field by itself does not uniquely identify a Cloud Storage
  // object. A Cloud Storage object is uniquely identified by the tuple of
  // (bucket, object, generation).
  string destination_name = 24 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.field_behavior) = IMMUTABLE
  ];

  // Required. Immutable. The name of the bucket containing the destination
  // object.
  string destination_bucket = 25 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.field_behavior) = IMMUTABLE,
    (google.api.resource_reference) = { type: "storage.googleapis.com/Bucket" }
  ];

  // The name of the Cloud KMS key that will be used to encrypt the destination
  // object. The Cloud KMS key must be located in same location as the object.
  // If the parameter is not specified, the request uses the destination
  // bucket's default encryption key, if any, or else the Google-managed
  // encryption key.
  string destination_kms_key = 27 [(google.api.resource_reference) = {
    type: "cloudkms.googleapis.com/CryptoKey"
  }];

  // Properties of the destination, post-rewrite object.
  // The `name`, `bucket` and `kms_key` fields must not be populated (these
  // values are specified in the `destination_name`, `destination_bucket`, and
  // `destination_kms_key` fields).
  // If `destination` is present it will be used to construct the destination
  // object's metadata; otherwise the destination object's metadata will be
  // copied from the source object.
  Object destination = 1;

  // Required. Name of the bucket in which to find the source object.
  string source_bucket = 2 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = { type: "storage.googleapis.com/Bucket" }
  ];

  // Required. Name of the source object.
  string source_object = 3 [(google.api.field_behavior) = REQUIRED];

  // If present, selects a specific revision of the source object (as opposed to
  // the latest version, the default).
  int64 source_generation = 4;

  // Include this field (from the previous rewrite response) on each rewrite
  // request after the first one, until the rewrite response 'done' flag is
  // true. Calls that provide a rewriteToken can omit all other request fields,
  // but if included those fields must match the values provided in the first
  // rewrite request.
  string rewrite_token = 5;

  // Apply a predefined set of access controls to the destination object.
  // Valid values are "authenticatedRead", "bucketOwnerFullControl",
  // "bucketOwnerRead", "private", "projectPrivate", or "publicRead".
  string destination_predefined_acl = 28;

  // Makes the operation conditional on whether the object's current generation
  // matches the given value. Setting to 0 makes the operation succeed only if
  // there are no live versions of the object.
  optional int64 if_generation_match = 7;

  // Makes the operation conditional on whether the object's live generation
  // does not match the given value. If no live object exists, the precondition
  // fails. Setting to 0 makes the operation succeed only if there is a live
  // version of the object.
  optional int64 if_generation_not_match = 8;

  // Makes the operation conditional on whether the destination object's current
  // metageneration matches the given value.
  optional int64 if_metageneration_match = 9;

  // Makes the operation conditional on whether the destination object's current
  // metageneration does not match the given value.
  optional int64 if_metageneration_not_match = 10;

  // Makes the operation conditional on whether the source object's live
  // generation matches the given value.
  optional int64 if_source_generation_match = 11;

  // Makes the operation conditional on whether the source object's live
  // generation does not match the given value.
  optional int64 if_source_generation_not_match = 12;

  // Makes the operation conditional on whether the source object's current
  // metageneration matches the given value.
  optional int64 if_source_metageneration_match = 13;

  // Makes the operation conditional on whether the source object's current
  // metageneration does not match the given value.
  optional int64 if_source_metageneration_not_match = 14;

  // The maximum number of bytes that will be rewritten per rewrite request.
  // Most callers
  // shouldn't need to specify this parameter - it is primarily in place to
  // support testing. If specified the value must be an integral multiple of
  // 1 MiB (1048576). Also, this only applies to requests where the source and
  // destination span locations and/or storage classes. Finally, this value must
  // not change across rewrite calls else you'll get an error that the
  // `rewriteToken` is invalid.
  int64 max_bytes_rewritten_per_call = 15;

  // The algorithm used to encrypt the source object, if any. Used if the source
  // object was encrypted with a Customer-Supplied Encryption Key.
  string copy_source_encryption_algorithm = 16;

  // The raw bytes (not base64-encoded) AES-256 encryption key used to encrypt
  // the source object, if it was encrypted with a Customer-Supplied Encryption
  // Key.
  bytes copy_source_encryption_key_bytes = 21;

  // The raw bytes (not base64-encoded) SHA256 hash of the encryption key used
  // to encrypt the source object, if it was encrypted with a Customer-Supplied
  // Encryption Key.
  bytes copy_source_encryption_key_sha256_bytes = 22;

  // A set of parameters common to Storage API requests concerning an object.
  CommonObjectRequestParams common_object_request_params = 19;

  // The checksums of the complete object. This will be used to validate the
  // destination object after rewriting.
  ObjectChecksums object_checksums = 29;
}

// A rewrite response.
message RewriteResponse {
  // The total bytes written so far, which can be used to provide a waiting user
  // with a progress indicator. This property is always present in the response.
  int64 total_bytes_rewritten = 1;

  // The total size of the object being copied in bytes. This property is always
  // present in the response.
  int64 object_size = 2;

  // `true` if the copy is finished; otherwise, `false` if
  // the copy is in progress. This property is always present in the response.
  bool done = 3;

  // A token to use in subsequent requests to continue copying data. This token
  // is present in the response only when there is more data to copy.
  string rewrite_token = 4;

  // A resource containing the metadata for the copied-to object. This property
  // is present in the response only when copying completes.
  Object resource = 5;
}

// Request message StartResumableWrite.
message StartResumableWriteRequest {
  // Required. The destination bucket, object, and metadata, as well as any
  // preconditions.
  WriteObjectSpec write_object_spec = 1
      [(google.api.field_behavior) = REQUIRED];

  // A set of parameters common to Storage API requests concerning an object.
  CommonObjectRequestParams common_object_request_params = 3;

  // The checksums of the complete object. This will be used to validate the
  // uploaded object. For each upload, object_checksums can be provided with
  // either StartResumableWriteRequest or the WriteObjectRequest with
  // finish_write set to `true`.
  ObjectChecksums object_checksums = 5;
}

// Response object for `StartResumableWrite`.
message StartResumableWriteResponse {
  // The upload_id of the newly started resumable write operation. This
  // value should be copied into the `WriteObjectRequest.upload_id` field.
  string upload_id = 1;
}

// Request message for UpdateObject.
message UpdateObjectRequest {
  // Required. The object to update.
  // The object's bucket and name fields are used to identify the object to
  // update. If present, the object's generation field selects a specific
  // revision of this object whose metadata should be updated. Otherwise,
  // assumes the live version of the object.
  Object object = 1 [(google.api.field_behavior) = REQUIRED];

  // Makes the operation conditional on whether the object's current generation
  // matches the given value. Setting to 0 makes the operation succeed only if
  // there are no live versions of the object.
  optional int64 if_generation_match = 2;

  // Makes the operation conditional on whether the object's live generation
  // does not match the given value. If no live object exists, the precondition
  // fails. Setting to 0 makes the operation succeed only if there is a live
  // version of the object.
  optional int64 if_generation_not_match = 3;

  // Makes the operation conditional on whether the object's current
  // metageneration matches the given value.
  optional int64 if_metageneration_match = 4;

  // Makes the operation conditional on whether the object's current
  // metageneration does not match the given value.
  optional int64 if_metageneration_not_match = 5;

  // Apply a predefined set of access controls to this object.
  // Valid values are "authenticatedRead", "bucketOwnerFullControl",
  // "bucketOwnerRead", "private", "projectPrivate", or "publicRead".
  string predefined_acl = 10;

  // Required. List of fields to be updated.
  //
  // To specify ALL fields, equivalent to the JSON API's "update" function,
  // specify a single field with the value `*`. Note: not recommended. If a new
  // field is introduced at a later time, an older client updating with the `*`
  // may accidentally reset the new field's value.
  //
  // Not specifying any fields is an error.
  google.protobuf.FieldMask update_mask = 7
      [(google.api.field_behavior) = REQUIRED];

  // A set of parameters common to Storage API requests concerning an object.
  CommonObjectRequestParams common_object_request_params = 8;
}

// Request message for GetServiceAccount.
message GetServiceAccountRequest {
  // Required. Project ID, in the format of "projects/{projectIdentifier}".
  // {projectIdentifier} can be the project ID or project number.
  string project = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {
      type: "cloudresourcemanager.googleapis.com/Project"
    }
  ];
}

// Request message for CreateHmacKey.
message CreateHmacKeyRequest {
  // Required. The project that the HMAC-owning service account lives in, in the
  // format of "projects/{projectIdentifier}". {projectIdentifier} can be the
  // project ID or project number.
  string project = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {
      type: "cloudresourcemanager.googleapis.com/Project"
    }
  ];

  // Required. The service account to create the HMAC for.
  string service_account_email = 2 [(google.api.field_behavior) = REQUIRED];
}

// Create hmac response.  The only time the secret for an HMAC will be returned.
message CreateHmacKeyResponse {
  // Key metadata.
  HmacKeyMetadata metadata = 1;

  // HMAC key secret material.
  // In raw bytes format (not base64-encoded).
  bytes secret_key_bytes = 3;
}

// Request object to delete a given HMAC key.
message DeleteHmacKeyRequest {
  // Required. The identifying key for the HMAC to delete.
  string access_id = 1 [(google.api.field_behavior) = REQUIRED];

  // Required. The project that owns the HMAC key, in the format of
  // "projects/{projectIdentifier}".
  // {projectIdentifier} can be the project ID or project number.
  string project = 2 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {
      type: "cloudresourcemanager.googleapis.com/Project"
    }
  ];
}

// Request object to get metadata on a given HMAC key.
message GetHmacKeyRequest {
  // Required. The identifying key for the HMAC to delete.
  string access_id = 1 [(google.api.field_behavior) = REQUIRED];

  // Required. The project the HMAC key lies in, in the format of
  // "projects/{projectIdentifier}".
  // {projectIdentifier} can be the project ID or project number.
  string project = 2 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {
      type: "cloudresourcemanager.googleapis.com/Project"
    }
  ];
}

// Request to fetch a list of HMAC keys under a given project.
message ListHmacKeysRequest {
  // Required. The project to list HMAC keys for, in the format of
  // "projects/{projectIdentifier}".
  // {projectIdentifier} can be the project ID or project number.
  string project = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {
      type: "cloudresourcemanager.googleapis.com/Project"
    }
  ];

  // The maximum number of keys to return.
  int32 page_size = 2;

  // A previously returned token from ListHmacKeysResponse to get the next page.
  string page_token = 3;

  // If set, filters to only return HMAC keys for specified service account.
  string service_account_email = 4;

  // If set, return deleted keys that have not yet been wiped out.
  bool show_deleted_keys = 5;
}

// Hmac key list response with next page information.
message ListHmacKeysResponse {
  // The list of items.
  repeated HmacKeyMetadata hmac_keys = 1;

  // The continuation token, used to page through large result sets. Provide
  // this value in a subsequent request to return the next page of results.
  string next_page_token = 2;
}

// Request object to update an HMAC key state.
// HmacKeyMetadata.state is required and the only writable field in
// UpdateHmacKey operation. Specifying fields other than state will result in an
// error.
message UpdateHmacKeyRequest {
  // Required. The HMAC key to update.
  // If present, the hmac_key's `id` field will be used to identify the key.
  // Otherwise, the hmac_key's access_id and project fields will be used to
  // identify the key.
  HmacKeyMetadata hmac_key = 1 [(google.api.field_behavior) = REQUIRED];

  // Update mask for hmac_key.
  // Not specifying any fields will mean only the `state` field is updated to
  // the value specified in `hmac_key`.
  google.protobuf.FieldMask update_mask = 3;
}

// Parameters that can be passed to any object request.
message CommonObjectRequestParams {
  // Encryption algorithm used with the Customer-Supplied Encryption Keys
  // feature.
  string encryption_algorithm = 1;

  // Encryption key used with the Customer-Supplied Encryption Keys feature.
  // In raw bytes format (not base64-encoded).
  bytes encryption_key_bytes = 4;

  // SHA256 hash of encryption key used with the Customer-Supplied Encryption
  // Keys feature.
  bytes encryption_key_sha256_bytes = 5;
}

// Shared constants.
message ServiceConstants {
  // A collection of constant values meaningful to the Storage API.
  enum Values {
    option allow_alias = true;

    // Unused. Proto3 requires first enum to be 0.
    VALUES_UNSPECIFIED = 0;

    // The maximum size chunk that can will be returned in a single
    // ReadRequest.
    // 2 MiB.
    MAX_READ_CHUNK_BYTES = 2097152;

    // The maximum size chunk that can be sent in a single WriteObjectRequest.
    // 2 MiB.
    MAX_WRITE_CHUNK_BYTES = 2097152;

    // The maximum size of an object in MB - whether written in a single stream
    // or composed from multiple other objects.
    // 5 TiB.
    MAX_OBJECT_SIZE_MB = 5242880;

    // The maximum length field name that can be sent in a single
    // custom metadata field.
    // 1 KiB.
    MAX_CUSTOM_METADATA_FIELD_NAME_BYTES = 1024;

    // The maximum length field value that can be sent in a single
    // custom_metadata field.
    // 4 KiB.
    MAX_CUSTOM_METADATA_FIELD_VALUE_BYTES = 4096;

    // The maximum total bytes that can be populated into all field names and
    // values of the custom_metadata for one object.
    // 8 KiB.
    MAX_CUSTOM_METADATA_TOTAL_SIZE_BYTES = 8192;

    // The maximum total bytes that can be populated into all bucket metadata
    // fields.
    // 20 KiB.
    MAX_BUCKET_METADATA_TOTAL_SIZE_BYTES = 20480;

    // The maximum number of NotificationConfigs that can be registered
    // for a given bucket.
    MAX_NOTIFICATION_CONFIGS_PER_BUCKET = 100;

    // The maximum number of LifecycleRules that can be registered for a given
    // bucket.
    MAX_LIFECYCLE_RULES_PER_BUCKET = 100;

    // The maximum number of custom attributes per NotificationConfigs.
    MAX_NOTIFICATION_CUSTOM_ATTRIBUTES = 5;

    // The maximum length of a custom attribute key included in
    // NotificationConfig.
    MAX_NOTIFICATION_CUSTOM_ATTRIBUTE_KEY_LENGTH = 256;

    // The maximum length of a custom attribute value included in a
    // NotificationConfig.
    MAX_NOTIFICATION_CUSTOM_ATTRIBUTE_VALUE_LENGTH = 1024;

    // The maximum number of key/value entries per bucket label.
    MAX_LABELS_ENTRIES_COUNT = 64;

    // The maximum character length of the key or value in a bucket
    // label map.
    MAX_LABELS_KEY_VALUE_LENGTH = 63;

    // The maximum byte size of the key or value in a bucket label
    // map.
    MAX_LABELS_KEY_VALUE_BYTES = 128;

    // The maximum number of object IDs that can be included in a
    // DeleteObjectsRequest.
    MAX_OBJECT_IDS_PER_DELETE_OBJECTS_REQUEST = 1000;

    // The maximum number of days for which a token returned by the
    // GetListObjectsSplitPoints RPC is valid.
    SPLIT_TOKEN_MAX_VALID_DAYS = 14;
  }
}

// A bucket.
message Bucket {
  option (google.api.resource) = {
    type: "storage.googleapis.com/Bucket"
    pattern: "projects/{project}/buckets/{bucket}"
  };

  // Billing properties of a bucket.
  message Billing {
    // When set to true, Requester Pays is enabled for this bucket.
    bool requester_pays = 1;
  }

  // Cross-Origin Response sharing (CORS) properties for a bucket.
  // For more on Cloud Storage and CORS, see
  // https://cloud.google.com/storage/docs/cross-origin.
  // For more on CORS in general, see https://tools.ietf.org/html/rfc6454.
  message Cors {
    // The list of Origins eligible to receive CORS response headers. See
    // [https://tools.ietf.org/html/rfc6454][RFC 6454] for more on origins.
    // Note: "*" is permitted in the list of origins, and means "any Origin".
    repeated string origin = 1;

    // The list of HTTP methods on which to include CORS response headers,
    // (`GET`, `OPTIONS`, `POST`, etc) Note: "*" is permitted in the list of
    // methods, and means "any method".
    repeated string method = 2;

    // The list of HTTP headers other than the
    // [https://www.w3.org/TR/cors/#simple-response-header][simple response
    // headers] to give permission for the user-agent to share across domains.
    repeated string response_header = 3;

    // The value, in seconds, to return in the
    // [https://www.w3.org/TR/cors/#access-control-max-age-response-header][Access-Control-Max-Age
    // header] used in preflight responses.
    int32 max_age_seconds = 4;
  }

  // Encryption properties of a bucket.
  message Encryption {
    // The name of the Cloud KMS key that will be used to encrypt objects
    // inserted into this bucket, if no encryption method is specified.
    string default_kms_key = 1 [(google.api.resource_reference) = {
      type: "cloudkms.googleapis.com/CryptoKey"
    }];
  }

  // Bucket restriction options.
  message IamConfig {
    // Settings for Uniform Bucket level access.
    // See https://cloud.google.com/storage/docs/uniform-bucket-level-access.
    message UniformBucketLevelAccess {
      // If set, access checks only use bucket-level IAM policies or above.
      bool enabled = 1;

      // The deadline time for changing
      // `iam_config.uniform_bucket_level_access.enabled` from `true` to
      // `false`. Mutable until the specified deadline is reached, but not
      // afterward.
      google.protobuf.Timestamp lock_time = 2;
    }

    // Bucket restriction options currently enforced on the bucket.
    UniformBucketLevelAccess uniform_bucket_level_access = 1;

    // Whether IAM will enforce public access prevention. Valid values are
    // "enforced" or "inherited".
    string public_access_prevention = 3;
  }

  // Lifecycle properties of a bucket.
  // For more information, see https://cloud.google.com/storage/docs/lifecycle.
  message Lifecycle {
    // A lifecycle Rule, combining an action to take on an object and a
    // condition which will trigger that action.
    message Rule {
      // An action to take on an object.
      message Action {
        // Type of the action. Currently, only `Delete`, `SetStorageClass`, and
        // `AbortIncompleteMultipartUpload` are supported.
        string type = 1;

        // Target storage class. Required iff the type of the action is
        // SetStorageClass.
        string storage_class = 2;
      }

      // A condition of an object which triggers some action.
      message Condition {
        // Age of an object (in days). This condition is satisfied when an
        // object reaches the specified age.
        // A value of 0 indicates that all objects immediately match this
        // condition.
        optional int32 age_days = 1;

        // This condition is satisfied when an object is created before midnight
        // of the specified date in UTC.
        google.type.Date created_before = 2;

        // Relevant only for versioned objects. If the value is
        // `true`, this condition matches live objects; if the value
        // is `false`, it matches archived objects.
        optional bool is_live = 3;

        // Relevant only for versioned objects. If the value is N, this
        // condition is satisfied when there are at least N versions (including
        // the live version) newer than this version of the object.
        optional int32 num_newer_versions = 4;

        // Objects having any of the storage classes specified by this condition
        // will be matched. Values include `MULTI_REGIONAL`, `REGIONAL`,
        // `NEARLINE`, `COLDLINE`, `STANDARD`, and
        // `DURABLE_REDUCED_AVAILABILITY`.
        repeated string matches_storage_class = 5;

        // Number of days that have elapsed since the custom timestamp set on an
        // object.
        // The value of the field must be a nonnegative integer.
        optional int32 days_since_custom_time = 7;

        // An object matches this condition if the custom timestamp set on the
        // object is before the specified date in UTC.
        google.type.Date custom_time_before = 8;

        // This condition is relevant only for versioned objects. An object
        // version satisfies this condition only if these many days have been
        // passed since it became noncurrent. The value of the field must be a
        // nonnegative integer. If it's zero, the object version will become
        // eligible for Lifecycle action as soon as it becomes noncurrent.
        optional int32 days_since_noncurrent_time = 9;

        // This condition is relevant only for versioned objects. An object
        // version satisfies this condition only if it became noncurrent before
        // the specified date in UTC.
        google.type.Date noncurrent_time_before = 10;

        // List of object name prefixes. If any prefix exactly matches the
        // beginning of the object name, the condition evaluates to true.
        repeated string matches_prefix = 11;

        // List of object name suffixes. If any suffix exactly matches the
        // end of the object name, the condition evaluates to true.
        repeated string matches_suffix = 12;
      }

      // The action to take.
      Action action = 1;

      // The condition(s) under which the action will be taken.
      Condition condition = 2;
    }

    // A lifecycle management rule, which is made of an action to take and the
    // condition(s) under which the action will be taken.
    repeated Rule rule = 1;
  }

  // Logging-related properties of a bucket.
  message Logging {
    // The destination bucket where the current bucket's logs should be placed,
    // using path format (like `projects/123456/buckets/foo`).
    string log_bucket = 1;

    // A prefix for log object names.
    string log_object_prefix = 2;
  }

  // Retention policy properties of a bucket.
  message RetentionPolicy {
    // Server-determined value that indicates the time from which policy was
    // enforced and effective.
    google.protobuf.Timestamp effective_time = 1;

    // Once locked, an object retention policy cannot be modified.
    bool is_locked = 2;

    // The duration that objects need to be retained. Retention duration must be
    // greater than zero and less than 100 years. Note that enforcement of
    // retention periods less than a day is not guaranteed. Such periods should
    // only be used for testing purposes. Any `nanos` value specified will be
    // rounded down to the nearest second.
    google.protobuf.Duration retention_duration = 4;
  }

  // Soft delete policy properties of a bucket.
  message SoftDeletePolicy {
    // The period of time that soft-deleted objects in the bucket must be
    // retained and cannot be permanently deleted. The duration must be greater
    // than or equal to 7 days and less than 1 year.
    optional google.protobuf.Duration retention_duration = 1;

    // Time from which the policy was effective. This is service-provided.
    optional google.protobuf.Timestamp effective_time = 2;
  }

  // Properties of a bucket related to versioning.
  // For more on Cloud Storage versioning, see
  // https://cloud.google.com/storage/docs/object-versioning.
  message Versioning {
    // While set to true, versioning is fully enabled for this bucket.
    bool enabled = 1;
  }

  // Properties of a bucket related to accessing the contents as a static
  // website. For more on hosting a static website via Cloud Storage, see
  // https://cloud.google.com/storage/docs/hosting-static-website.
  message Website {
    // If the requested object path is missing, the service will ensure the path
    // has a trailing '/', append this suffix, and attempt to retrieve the
    // resulting object. This allows the creation of `index.html`
    // objects to represent directory pages.
    string main_page_suffix = 1;

    // If the requested object path is missing, and any
    // `mainPageSuffix` object is missing, if applicable, the service
    // will return the named object from this bucket as the content for a
    // [https://tools.ietf.org/html/rfc7231#section-6.5.4][404 Not Found]
    // result.
    string not_found_page = 2;
  }

  // Configuration for Custom Dual Regions.  It should specify precisely two
  // eligible regions within the same Multiregion. More information on regions
  // may be found [https://cloud.google.com/storage/docs/locations][here].
  message CustomPlacementConfig {
    // List of locations to use for data placement.
    repeated string data_locations = 1;
  }

  // Configuration for a bucket's Autoclass feature.
  message Autoclass {
    // Enables Autoclass.
    bool enabled = 1;

    // Output only. Latest instant at which the `enabled` field was set to true
    // after being disabled/unconfigured or set to false after being enabled. If
    // Autoclass is enabled when the bucket is created, the toggle_time is set
    // to the bucket creation time.
    google.protobuf.Timestamp toggle_time = 2
        [(google.api.field_behavior) = OUTPUT_ONLY];

    // An object in an Autoclass bucket will eventually cool down to the
    // terminal storage class if there is no access to the object.
    // The only valid values are NEARLINE and ARCHIVE.
    optional string terminal_storage_class = 3;

    // Output only. Latest instant at which the autoclass terminal storage class
    // was updated.
    optional google.protobuf.Timestamp terminal_storage_class_update_time = 4
        [(google.api.field_behavior) = OUTPUT_ONLY];
  }

  // Configuration for a bucket's hierarchical namespace feature.
  message HierarchicalNamespace {
    // Optional. Enables the hierarchical namespace feature.
    bool enabled = 1 [(google.api.field_behavior) = OPTIONAL];
  }

  // Immutable. The name of the bucket.
  // Format: `projects/{project}/buckets/{bucket}`
  string name = 1 [(google.api.field_behavior) = IMMUTABLE];

  // Output only. The user-chosen part of the bucket name. The `{bucket}`
  // portion of the `name` field. For globally unique buckets, this is equal to
  // the "bucket name" of other Cloud Storage APIs. Example: "pub".
  string bucket_id = 2 [(google.api.field_behavior) = OUTPUT_ONLY];

  // The etag of the bucket.
  // If included in the metadata of an UpdateBucketRequest, the operation will
  // only be performed if the etag matches that of the bucket.
  string etag = 29;

  // Immutable. The project which owns this bucket, in the format of
  // "projects/{projectIdentifier}".
  // {projectIdentifier} can be the project ID or project number.
  string project = 3 [
    (google.api.field_behavior) = IMMUTABLE,
    (google.api.resource_reference) = {
      type: "cloudresourcemanager.googleapis.com/Project"
    }
  ];

  // Output only. The metadata generation of this bucket.
  int64 metageneration = 4 [(google.api.field_behavior) = OUTPUT_ONLY];

  // Immutable. The location of the bucket. Object data for objects in the
  // bucket resides in physical storage within this region.  Defaults to `US`.
  // See the
  // [https://developers.google.com/storage/docs/concepts-techniques#specifyinglocations"][developer's
  // guide] for the authoritative list. Attempting to update this field after
  // the bucket is created will result in an error.
  string location = 5 [(google.api.field_behavior) = IMMUTABLE];

  // Output only. The location type of the bucket (region, dual-region,
  // multi-region, etc).
  string location_type = 6 [(google.api.field_behavior) = OUTPUT_ONLY];

  // The bucket's default storage class, used whenever no storageClass is
  // specified for a newly-created object. This defines how objects in the
  // bucket are stored and determines the SLA and the cost of storage.
  // If this value is not specified when the bucket is created, it will default
  // to `STANDARD`. For more information, see
  // https://developers.google.com/storage/docs/storage-classes.
  string storage_class = 7;

  // The recovery point objective for cross-region replication of the bucket.
  // Applicable only for dual- and multi-region buckets. "DEFAULT" uses default
  // replication. "ASYNC_TURBO" enables turbo replication, valid for dual-region
  // buckets only. If rpo is not specified when the bucket is created, it
  // defaults to "DEFAULT". For more information, see
  // https://cloud.google.com/storage/docs/availability-durability#turbo-replication.
  string rpo = 27;

  // Access controls on the bucket.
  // If iam_config.uniform_bucket_level_access is enabled on this bucket,
  // requests to set, read, or modify acl is an error.
  repeated BucketAccessControl acl = 8;

  // Default access controls to apply to new objects when no ACL is provided.
  // If iam_config.uniform_bucket_level_access is enabled on this bucket,
  // requests to set, read, or modify acl is an error.
  repeated ObjectAccessControl default_object_acl = 9;

  // The bucket's lifecycle config. See
  // [https://developers.google.com/storage/docs/lifecycle]Lifecycle Management]
  // for more information.
  Lifecycle lifecycle = 10;

  // Output only. The creation time of the bucket.
  google.protobuf.Timestamp create_time = 11
      [(google.api.field_behavior) = OUTPUT_ONLY];

  // The bucket's [https://www.w3.org/TR/cors/][Cross-Origin Resource Sharing]
  // (CORS) config.
  repeated Cors cors = 12;

  // Output only. The modification time of the bucket.
  google.protobuf.Timestamp update_time = 13
      [(google.api.field_behavior) = OUTPUT_ONLY];

  // The default value for event-based hold on newly created objects in this
  // bucket.  Event-based hold is a way to retain objects indefinitely until an
  // event occurs, signified by the
  // hold's release. After being released, such objects will be subject to
  // bucket-level retention (if any).  One sample use case of this flag is for
  // banks to hold loan documents for at least 3 years after loan is paid in
  // full. Here, bucket-level retention is 3 years and the event is loan being
  // paid in full. In this example, these objects will be held intact for any
  // number of years until the event has occurred (event-based hold on the
  // object is released) and then 3 more years after that. That means retention
  // duration of the objects begins from the moment event-based hold
  // transitioned from true to false.  Objects under event-based hold cannot be
  // deleted, overwritten or archived until the hold is removed.
  bool default_event_based_hold = 14;

  // User-provided labels, in key/value pairs.
  map<string, string> labels = 15;

  // The bucket's website config, controlling how the service behaves
  // when accessing bucket contents as a web site. See the
  // [https://cloud.google.com/storage/docs/static-website][Static Website
  // Examples] for more information.
  Website website = 16;

  // The bucket's versioning config.
  Versioning versioning = 17;

  // The bucket's logging config, which defines the destination bucket
  // and name prefix (if any) for the current bucket's logs.
  Logging logging = 18;

  // Output only. The owner of the bucket. This is always the project team's
  // owner group.
  Owner owner = 19 [(google.api.field_behavior) = OUTPUT_ONLY];

  // Encryption config for a bucket.
  Encryption encryption = 20;

  // The bucket's billing config.
  Billing billing = 21;

  // The bucket's retention policy. The retention policy enforces a minimum
  // retention time for all objects contained in the bucket, based on their
  // creation time. Any attempt to overwrite or delete objects younger than the
  // retention period will result in a PERMISSION_DENIED error.  An unlocked
  // retention policy can be modified or removed from the bucket via a
  // storage.buckets.update operation. A locked retention policy cannot be
  // removed or shortened in duration for the lifetime of the bucket.
  // Attempting to remove or decrease period of a locked retention policy will
  // result in a PERMISSION_DENIED error.
  RetentionPolicy retention_policy = 22;

  // The bucket's IAM config.
  IamConfig iam_config = 23;

  // Reserved for future use.
  bool satisfies_pzs = 25;

  // Configuration that, if present, specifies the data placement for a
  // [https://cloud.google.com/storage/docs/use-dual-regions][Dual Region].
  CustomPlacementConfig custom_placement_config = 26;

  // The bucket's Autoclass configuration. If there is no configuration, the
  // Autoclass feature will be disabled and have no effect on the bucket.
  Autoclass autoclass = 28;

  // Optional. The bucket's hierarchical namespace configuration. If there is no
  // configuration, the hierarchical namespace feature will be disabled and have
  // no effect on the bucket.
  HierarchicalNamespace hierarchical_namespace = 32
      [(google.api.field_behavior) = OPTIONAL];

  // Optional. The bucket's soft delete policy. The soft delete policy prevents
  // soft-deleted objects from being permanently deleted.
  SoftDeletePolicy soft_delete_policy = 31
      [(google.api.field_behavior) = OPTIONAL];
}

// An access-control entry.
message BucketAccessControl {
  // The access permission for the entity.
  string role = 1;

  // The ID of the access-control entry.
  string id = 2;

  // The entity holding the permission, in one of the following forms:
  // * `user-{userid}`
  // * `user-{email}`
  // * `group-{groupid}`
  // * `group-{email}`
  // * `domain-{domain}`
  // * `project-{team}-{projectnumber}`
  // * `project-{team}-{projectid}`
  // * `allUsers`
  // * `allAuthenticatedUsers`
  // Examples:
  // * The user `[email protected]` would be `[email protected]`.
  // * The group `[email protected]` would be
  // `[email protected]`
  // * All members of the Google Apps for Business domain `example.com` would be
  // `domain-example.com`
  // For project entities, `project-{team}-{projectnumber}` format will be
  // returned on response.
  string entity = 3;

  // Output only. The alternative entity format, if exists. For project
  // entities, `project-{team}-{projectid}` format will be returned on response.
  string entity_alt = 9 [(google.api.field_behavior) = OUTPUT_ONLY];

  // The ID for the entity, if any.
  string entity_id = 4;

  // The etag of the BucketAccessControl.
  // If included in the metadata of an update or delete request message, the
  // operation operation will only be performed if the etag matches that of the
  // bucket's BucketAccessControl.
  string etag = 8;

  // The email address associated with the entity, if any.
  string email = 5;

  // The domain associated with the entity, if any.
  string domain = 6;

  // The project team associated with the entity, if any.
  ProjectTeam project_team = 7;
}

// Message used to convey content being read or written, along with an optional
// checksum.
message ChecksummedData {
  // Optional. The data.
  bytes content = 1 [ctype = CORD, (google.api.field_behavior) = OPTIONAL];

  // If set, the CRC32C digest of the content field.
  optional fixed32 crc32c = 2;
}

// Message used for storing full (not subrange) object checksums.
message ObjectChecksums {
  // CRC32C digest of the object data. Computed by the Cloud Storage service for
  // all written objects.
  // If set in a WriteObjectRequest, service will validate that the stored
  // object matches this checksum.
  optional fixed32 crc32c = 1;

  // 128 bit MD5 hash of the object data.
  // For more information about using the MD5 hash, see
  // [https://cloud.google.com/storage/docs/hashes-etags#json-api][Hashes and
  // ETags: Best Practices].
  // Not all objects will provide an MD5 hash. For example, composite objects
  // provide only crc32c hashes.
  // This value is equivalent to running `cat object.txt | openssl md5 -binary`
  bytes md5_hash = 2;
}

// Hmac Key Metadata, which includes all information other than the secret.
message HmacKeyMetadata {
  // Immutable. Resource name ID of the key in the format
  // {projectIdentifier}/{accessId}.
  // {projectIdentifier} can be the project ID or project number.
  string id = 1 [(google.api.field_behavior) = IMMUTABLE];

  // Immutable. Globally unique id for keys.
  string access_id = 2 [(google.api.field_behavior) = IMMUTABLE];

  // Immutable. Identifies the project that owns the service account of the
  // specified HMAC key, in the format "projects/{projectIdentifier}".
  // {projectIdentifier} can be the project ID or project number.
  string project = 3 [
    (google.api.field_behavior) = IMMUTABLE,
    (google.api.resource_reference) = {
      type: "cloudresourcemanager.googleapis.com/Project"
    }
  ];

  // Output only. Email of the service account the key authenticates as.
  string service_account_email = 4 [(google.api.field_behavior) = OUTPUT_ONLY];

  // State of the key. One of ACTIVE, INACTIVE, or DELETED.
  // Writable, can be updated by UpdateHmacKey operation.
  string state = 5;

  // Output only. The creation time of the HMAC key.
  google.protobuf.Timestamp create_time = 6
      [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. The last modification time of the HMAC key metadata.
  google.protobuf.Timestamp update_time = 7
      [(google.api.field_behavior) = OUTPUT_ONLY];

  // The etag of the HMAC key.
  string etag = 8;
}

// A directive to publish Pub/Sub notifications upon changes to a bucket.
message NotificationConfig {
  option (google.api.resource) = {
    type: "storage.googleapis.com/NotificationConfig"
    pattern: "projects/{project}/buckets/{bucket}/notificationConfigs/{notification_config}"
  };

  // Required. The resource name of this NotificationConfig.
  // Format:
  // `projects/{project}/buckets/{bucket}/notificationConfigs/{notificationConfig}`
  // The `{project}` portion may be `_` for globally unique buckets.
  string name = 1 [(google.api.field_behavior) = REQUIRED];

  // Required. The Pub/Sub topic to which this subscription publishes. Formatted
  // as:
  // '//pubsub.googleapis.com/projects/{project-identifier}/topics/{my-topic}'
  string topic = 2 [(google.api.field_behavior) = REQUIRED];

  // The etag of the NotificationConfig.
  // If included in the metadata of GetNotificationConfigRequest, the operation
  // will only be performed if the etag matches that of the NotificationConfig.
  string etag = 7;

  // If present, only send notifications about listed event types. If
  // empty, sent notifications for all event types.
  repeated string event_types = 3;

  // A list of additional attributes to attach to each Pub/Sub
  // message published for this NotificationConfig.
  map<string, string> custom_attributes = 4;

  // If present, only apply this NotificationConfig to object names that
  // begin with this prefix.
  string object_name_prefix = 5;

  // Required. The desired content of the Payload.
  string payload_format = 6 [(google.api.field_behavior) = REQUIRED];
}

// Describes the Customer-Supplied Encryption Key mechanism used to store an
// Object's data at rest.
message CustomerEncryption {
  // The encryption algorithm.
  string encryption_algorithm = 1;

  // SHA256 hash value of the encryption key.
  // In raw bytes format (not base64-encoded).
  bytes key_sha256_bytes = 3;
}

// An object.
message Object {
  // Immutable. The name of this object. Nearly any sequence of unicode
  // characters is valid. See
  // [Guidelines](https://cloud.google.com/storage/docs/objects#naming).
  // Example: `test.txt`
  // The `name` field by itself does not uniquely identify a Cloud Storage
  // object. A Cloud Storage object is uniquely identified by the tuple of
  // (bucket, object, generation).
  string name = 1 [(google.api.field_behavior) = IMMUTABLE];

  // Immutable. The name of the bucket containing this object.
  string bucket = 2 [
    (google.api.field_behavior) = IMMUTABLE,
    (google.api.resource_reference) = { type: "storage.googleapis.com/Bucket" }
  ];

  // The etag of the object.
  // If included in the metadata of an update or delete request message, the
  // operation will only be performed if the etag matches that of the live
  // object.
  string etag = 27;

  // Immutable. The content generation of this object. Used for object
  // versioning.
  int64 generation = 3 [(google.api.field_behavior) = IMMUTABLE];

  // Output only. The version of the metadata for this generation of this
  // object. Used for preconditions and for detecting changes in metadata. A
  // metageneration number is only meaningful in the context of a particular
  // generation of a particular object.
  int64 metageneration = 4 [(google.api.field_behavior) = OUTPUT_ONLY];

  // Storage class of the object.
  string storage_class = 5;

  // Output only. Content-Length of the object data in bytes, matching
  // [https://tools.ietf.org/html/rfc7230#section-3.3.2][RFC 7230 §3.3.2].
  int64 size = 6 [(google.api.field_behavior) = OUTPUT_ONLY];

  // Content-Encoding of the object data, matching
  // [https://tools.ietf.org/html/rfc7231#section-3.1.2.2][RFC 7231 §3.1.2.2]
  string content_encoding = 7;

  // Content-Disposition of the object data, matching
  // [https://tools.ietf.org/html/rfc6266][RFC 6266].
  string content_disposition = 8;

  // Cache-Control directive for the object data, matching
  // [https://tools.ietf.org/html/rfc7234#section-5.2"][RFC 7234 §5.2].
  // If omitted, and the object is accessible to all anonymous users, the
  // default will be `public, max-age=3600`.
  string cache_control = 9;

  // Access controls on the object.
  // If iam_config.uniform_bucket_level_access is enabled on the parent
  // bucket, requests to set, read, or modify acl is an error.
  repeated ObjectAccessControl acl = 10;

  // Content-Language of the object data, matching
  // [https://tools.ietf.org/html/rfc7231#section-3.1.3.2][RFC 7231 §3.1.3.2].
  string content_language = 11;

  // Output only. If this object is noncurrent, this is the time when the object
  // became noncurrent.
  google.protobuf.Timestamp delete_time = 12
      [(google.api.field_behavior) = OUTPUT_ONLY];

  // Content-Type of the object data, matching
  // [https://tools.ietf.org/html/rfc7231#section-3.1.1.5][RFC 7231 §3.1.1.5].
  // If an object is stored without a Content-Type, it is served as
  // `application/octet-stream`.
  string content_type = 13;

  // Output only. The creation time of the object.
  google.protobuf.Timestamp create_time = 14
      [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. Number of underlying components that make up this object.
  // Components are accumulated by compose operations.
  int32 component_count = 15 [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. Hashes for the data part of this object. This field is used
  // for output only and will be silently ignored if provided in requests.
  ObjectChecksums checksums = 16 [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. The modification time of the object metadata.
  // Set initially to object creation time and then updated whenever any
  // metadata of the object changes. This includes changes made by a requester,
  // such as modifying custom metadata, as well as changes made by Cloud Storage
  // on behalf of a requester, such as changing the storage class based on an
  // Object Lifecycle Configuration.
  google.protobuf.Timestamp update_time = 17
      [(google.api.field_behavior) = OUTPUT_ONLY];

  // Cloud KMS Key used to encrypt this object, if the object is encrypted by
  // such a key.
  string kms_key = 18 [(google.api.resource_reference) = {
    type: "cloudkms.googleapis.com/CryptoKey"
  }];

  // Output only. The time at which the object's storage class was last changed.
  // When the object is initially created, it will be set to time_created.
  google.protobuf.Timestamp update_storage_class_time = 19
      [(google.api.field_behavior) = OUTPUT_ONLY];

  // Whether an object is under temporary hold. While this flag is set to true,
  // the object is protected against deletion and overwrites.  A common use case
  // of this flag is regulatory investigations where objects need to be retained
  // while the investigation is ongoing. Note that unlike event-based hold,
  // temporary hold does not impact retention expiration time of an object.
  bool temporary_hold = 20;

  // A server-determined value that specifies the earliest time that the
  // object's retention period expires.
  // Note 1: This field is not provided for objects with an active event-based
  // hold, since retention expiration is unknown until the hold is removed.
  // Note 2: This value can be provided even when temporary hold is set (so that
  // the user can reason about policy without having to first unset the
  // temporary hold).
  google.protobuf.Timestamp retention_expire_time = 21;

  // User-provided metadata, in key/value pairs.
  map<string, string> metadata = 22;

  // Whether an object is under event-based hold.
  // An event-based hold is a way to force the retention of an object until
  // after some event occurs. Once the hold is released by explicitly setting
  // this field to false, the object will become subject to any bucket-level
  // retention policy, except that the retention duration will be calculated
  // from the time the event based hold was lifted, rather than the time the
  // object was created.
  //
  // In a WriteObject request, not setting this field implies that the value
  // should be taken from the parent bucket's "default_event_based_hold" field.
  // In a response, this field will always be set to true or false.
  optional bool event_based_hold = 23;

  // Output only. The owner of the object. This will always be the uploader of
  // the object.
  Owner owner = 24 [(google.api.field_behavior) = OUTPUT_ONLY];

  // Metadata of Customer-Supplied Encryption Key, if the object is encrypted by
  // such a key.
  CustomerEncryption customer_encryption = 25;

  // A user-specified timestamp set on an object.
  google.protobuf.Timestamp custom_time = 26;

  // Output only. This is the time when the object became soft-deleted.
  //
  // Soft-deleted objects are only accessible if a soft_delete_policy is
  // enabled. Also see hard_delete_time.
  optional google.protobuf.Timestamp soft_delete_time = 28
      [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. The time when the object will be permanently deleted.
  //
  // Only set when an object becomes soft-deleted with a soft_delete_policy.
  // Otherwise, the object will not be accessible.
  optional google.protobuf.Timestamp hard_delete_time = 29
      [(google.api.field_behavior) = OUTPUT_ONLY];
}

// An access-control entry.
message ObjectAccessControl {
  // The access permission for the entity.
  string role = 1;

  // The ID of the access-control entry.
  string id = 2;

  // The entity holding the permission, in one of the following forms:
  // * `user-{userid}`
  // * `user-{email}`
  // * `group-{groupid}`
  // * `group-{email}`
  // * `domain-{domain}`
  // * `project-{team}-{projectnumber}`
  // * `project-{team}-{projectid}`
  // * `allUsers`
  // * `allAuthenticatedUsers`
  // Examples:
  // * The user `[email protected]` would be `[email protected]`.
  // * The group `[email protected]` would be
  // `[email protected]`.
  // * All members of the Google Apps for Business domain `example.com` would be
  // `domain-example.com`.
  // For project entities, `project-{team}-{projectnumber}` format will be
  // returned on response.
  string entity = 3;

  // Output only. The alternative entity format, if exists. For project
  // entities, `project-{team}-{projectid}` format will be returned on response.
  string entity_alt = 9 [(google.api.field_behavior) = OUTPUT_ONLY];

  // The ID for the entity, if any.
  string entity_id = 4;

  // The etag of the ObjectAccessControl.
  // If included in the metadata of an update or delete request message, the
  // operation will only be performed if the etag matches that of the live
  // object's ObjectAccessControl.
  string etag = 8;

  // The email address associated with the entity, if any.
  string email = 5;

  // The domain associated with the entity, if any.
  string domain = 6;

  // The project team associated with the entity, if any.
  ProjectTeam project_team = 7;
}

// The result of a call to Objects.ListObjects
message ListObjectsResponse {
  // The list of items.
  repeated Object objects = 1;

  // The list of prefixes of objects matching-but-not-listed up to and including
  // the requested delimiter.
  repeated string prefixes = 2;

  // The continuation token, used to page through large result sets. Provide
  // this value in a subsequent request to return the next page of results.
  string next_page_token = 3;
}

// Represents the Viewers, Editors, or Owners of a given project.
message ProjectTeam {
  // The project number.
  string project_number = 1;

  // The team.
  string team = 2;
}

// A service account, owned by Cloud Storage, which may be used when taking
// action on behalf of a given project, for example to publish Pub/Sub
// notifications or to retrieve security keys.
message ServiceAccount {
  // The ID of the notification.
  string email_address = 1;
}

// The owner of a specific resource.
message Owner {
  // The entity, in the form `user-`*userId*.
  string entity = 1;

  // The ID for the entity.
  string entity_id = 2;
}

// Specifies a requested range of bytes to download.
message ContentRange {
  // The starting offset of the object data. This value is inclusive.
  int64 start = 1;

  // The ending offset of the object data. This value is exclusive.
  int64 end = 2;

  // The complete length of the object data.
  int64 complete_length = 3;
}