# Cloud Pub/Sub API . projects . subscriptions

## Instance Methods

Acknowledges the messages associated with the `ack_ids` in the

Creates a subscription to a given topic.

Deletes an existing subscription. All pending messages in the subscription

Gets the configuration details of a subscription.

Gets the access control policy for a resource.

Lists matching subscriptions.

Retrieves the next page of results.

Modifies the ack deadline for a specific message. This method is useful

Modifies the `PushConfig` for a specified subscription.

Pulls messages from the server. Returns an empty list if there are no

Sets the access control policy on the specified resource. Replaces any

Returns permissions that a caller has on the specified resource.

### Method Details

`acknowledge(subscription, body=None, x__xgafv=None)`

    Acknowledges the messages associated with the `ack_ids` in the
    `AcknowledgeRequest`. The Pub/Sub system can remove the relevant messages
    from the subscription.

    Acknowledging a message whose ack deadline has expired may succeed,
    but such a message may be redelivered later. Acknowledging a message more
    than once will not result in an error.

    Args:
      subscription: string, The subscription whose message is being acknowledged. (required)
      body: object, The request body.
        The object takes the form of:

    { # Request for the Acknowledge method.
        "ackIds": [ # The acknowledgment ID for the messages being acknowledged that was returned
            # by the Pub/Sub system in the `Pull` response. Must not be empty.
          "A String",
        ],
      }

      x__xgafv: string, V1 error format.
        Allowed values
          1 - v1 error format
          2 - v2 error format

    Returns:
      An object of the form:

        { # A generic empty message that you can re-use to avoid defining duplicated
          # empty messages in your APIs. A typical example is to use it as the request
          # or the response type of an API method. For instance:
          #
          #     service Foo {
          #       rpc Bar(google.protobuf.Empty) returns (google.protobuf.Empty);
          #     }
          #
          # The JSON representation for `Empty` is empty JSON object `{}`.
      }

`create(name, body=None, x__xgafv=None)`

    Creates a subscription to a given topic.
    If the subscription already exists, returns `ALREADY_EXISTS`.
    If the corresponding topic doesn't exist, returns `NOT_FOUND`.

    If the name is not provided in the request, the server will assign a random
    name for this subscription on the same project as the topic. Note that
    for REST API requests, you must specify a name.

    Args:
      name: string, The name of the subscription. It must have the format
    `"projects/{project}/subscriptions/{subscription}"`. `{subscription}` must
    start with a letter, and contain only letters (`[A-Za-z]`), numbers
    (`[0-9]`), dashes (`-`), underscores (`_`), periods (`.`), tildes (`~`),
    plus (`+`) or percent signs (`%`). It must be between 3 and 255 characters
    in length, and it must not start with `"goog"`. (required)
      body: object, The request body.
        The object takes the form of:

    { # A subscription resource.
        "pushConfig": { # Configuration for a push delivery endpoint. # If push delivery is used with this subscription, this field is
            # used to configure it. An empty `pushConfig` signifies that the subscriber
            # will pull and ack messages using API methods.
          "pushEndpoint": "A String", # A URL locating the endpoint to which messages should be pushed.
              # For example, a Webhook endpoint might use "https://example.com/push".
          "attributes": { # Endpoint configuration attributes.
              #
              # Every endpoint has a set of API supported attributes that can be used to
              # control different aspects of the message delivery.
              #
              # The currently supported attribute is `x-goog-version`, which you can
              # use to change the format of the push message. This attribute
              # indicates the version of the data expected by the endpoint. This
              # controls the shape of the envelope (i.e. its fields and metadata).
              # The endpoint version is based on the version of the Pub/Sub
              # API.
              #
              # If not present during the `CreateSubscription` call, it will default to
              # the version of the API used to make such call. If not present during a
              # `ModifyPushConfig` call, its value will not be changed. `GetSubscription`
              # calls will always return a valid version, even if the subscription was
              # created without this attribute.
              #
              # The possible values for this attribute are:
              #
              # * `v1beta1`: uses the push format defined in the v1beta1 Pub/Sub API.
              # * `v1` or `v1beta2`: uses the push format defined in the v1 Pub/Sub API.
            "a_key": "A String",
          },
          "oidcToken": { # Contains information needed for generating an # If specified, Pub/Sub will generate and attach an OIDC JWT token as an
              # `Authorization` header in the HTTP request for every pushed message.
              # [OpenID Connect
              # token](https://developers.google.com/identity/protocols/OpenIDConnect).
            "serviceAccountEmail": "A String", # [Service account
                # email](https://cloud.google.com/iam/docs/service-accounts)
                # to be used for generating the OIDC token. The caller (for
                # CreateSubscription, UpdateSubscription, and ModifyPushConfig RPCs) must
                # have the iam.serviceAccounts.actAs permission for the service account.
            "audience": "A String", # Audience to be used when generating OIDC token. The audience claim
                # identifies the recipients that the JWT is intended for. The audience
                # value is a single case-sensitive string. Having multiple values (array)
                # for the audience field is not supported. More info about the OIDC JWT
                # token audience here: https://tools.ietf.org/html/rfc7519#section-4.1.3
                # Note: if not specified, the Push endpoint URL will be used.
          },
        },
        "name": "A String", # The name of the subscription. It must have the format
            # `"projects/{project}/subscriptions/{subscription}"`. `{subscription}` must
            # start with a letter, and contain only letters (`[A-Za-z]`), numbers
            # (`[0-9]`), dashes (`-`), underscores (`_`), periods (`.`), tildes (`~`),
            # plus (`+`) or percent signs (`%`). It must be between 3 and 255 characters
            # in length, and it must not start with `"goog"`.
        "ackDeadlineSeconds": 42, # This value is the maximum time after a subscriber receives a message
            # before the subscriber should acknowledge the message. After message
            # delivery but before the ack deadline expires and before the message is
            # acknowledged, it is an outstanding message and will not be delivered
            # again during that time (on a best-effort basis).
            #
            # For pull subscriptions, this value is used as the initial value for the ack
            # deadline. To override this value for a given message, call
            # `ModifyAckDeadline` with the corresponding `ack_id` if using pull.
            # The maximum custom deadline you can specify is 600 seconds (10 minutes).
            #
            # For push delivery, this value is also used to set the request timeout for
            # the call to the push endpoint.
            #
            # If the subscriber never acknowledges the message, the Pub/Sub
            # system will eventually redeliver the message.
            #
            # If this parameter is 0, a default value of 10 seconds is used.
        "topic": "A String", # The name of the topic from which this subscription is receiving messages.
            # The value of this field will be `_deleted-topic_` if the topic has been
            # deleted.
      }

      x__xgafv: string, V1 error format.
        Allowed values
          1 - v1 error format
          2 - v2 error format

    Returns:
      An object of the form:

        { # A subscription resource.
          "pushConfig": { # Configuration for a push delivery endpoint. # If push delivery is used with this subscription, this field is
              # used to configure it. An empty `pushConfig` signifies that the subscriber
              # will pull and ack messages using API methods.
            "pushEndpoint": "A String", # A URL locating the endpoint to which messages should be pushed.
                # For example, a Webhook endpoint might use "https://example.com/push".
            "attributes": { # Endpoint configuration attributes.
                #
                # Every endpoint has a set of API supported attributes that can be used to
                # control different aspects of the message delivery.
                #
                # The currently supported attribute is `x-goog-version`, which you can
                # use to change the format of the push message. This attribute
                # indicates the version of the data expected by the endpoint. This
                # controls the shape of the envelope (i.e. its fields and metadata).
                # The endpoint version is based on the version of the Pub/Sub
                # API.
                #
                # If not present during the `CreateSubscription` call, it will default to
                # the version of the API used to make such call. If not present during a
                # `ModifyPushConfig` call, its value will not be changed. `GetSubscription`
                # calls will always return a valid version, even if the subscription was
                # created without this attribute.
                #
                # The possible values for this attribute are:
                #
                # * `v1beta1`: uses the push format defined in the v1beta1 Pub/Sub API.
                # * `v1` or `v1beta2`: uses the push format defined in the v1 Pub/Sub API.
              "a_key": "A String",
            },
            "oidcToken": { # Contains information needed for generating an # If specified, Pub/Sub will generate and attach an OIDC JWT token as an
                # `Authorization` header in the HTTP request for every pushed message.
                # [OpenID Connect
                # token](https://developers.google.com/identity/protocols/OpenIDConnect).
              "serviceAccountEmail": "A String", # [Service account
                  # email](https://cloud.google.com/iam/docs/service-accounts)
                  # to be used for generating the OIDC token. The caller (for
                  # CreateSubscription, UpdateSubscription, and ModifyPushConfig RPCs) must
                  # have the iam.serviceAccounts.actAs permission for the service account.
              "audience": "A String", # Audience to be used when generating OIDC token. The audience claim
                  # identifies the recipients that the JWT is intended for. The audience
                  # value is a single case-sensitive string. Having multiple values (array)
                  # for the audience field is not supported. More info about the OIDC JWT
                  # token audience here: https://tools.ietf.org/html/rfc7519#section-4.1.3
                  # Note: if not specified, the Push endpoint URL will be used.
            },
          },
          "name": "A String", # The name of the subscription. It must have the format
              # `"projects/{project}/subscriptions/{subscription}"`. `{subscription}` must
              # start with a letter, and contain only letters (`[A-Za-z]`), numbers
              # (`[0-9]`), dashes (`-`), underscores (`_`), periods (`.`), tildes (`~`),
              # plus (`+`) or percent signs (`%`). It must be between 3 and 255 characters
              # in length, and it must not start with `"goog"`.
          "ackDeadlineSeconds": 42, # This value is the maximum time after a subscriber receives a message
              # before the subscriber should acknowledge the message. After message
              # delivery but before the ack deadline expires and before the message is
              # acknowledged, it is an outstanding message and will not be delivered
              # again during that time (on a best-effort basis).
              #
              # For pull subscriptions, this value is used as the initial value for the ack
              # deadline. To override this value for a given message, call
              # `ModifyAckDeadline` with the corresponding `ack_id` if using pull.
              # The maximum custom deadline you can specify is 600 seconds (10 minutes).
              #
              # For push delivery, this value is also used to set the request timeout for
              # the call to the push endpoint.
              #
              # If the subscriber never acknowledges the message, the Pub/Sub
              # system will eventually redeliver the message.
              #
              # If this parameter is 0, a default value of 10 seconds is used.
          "topic": "A String", # The name of the topic from which this subscription is receiving messages.
              # The value of this field will be `_deleted-topic_` if the topic has been
              # deleted.
        }

`delete(subscription, x__xgafv=None)`

    Deletes an existing subscription. All pending messages in the subscription
    are immediately dropped. Calls to `Pull` after deletion will return
    `NOT_FOUND`. After a subscription is deleted, a new one may be created with
    the same name, but the new one has no association with the old
    subscription, or its topic unless the same topic is specified.

    Args:
      subscription: string, The subscription to delete. (required)
      x__xgafv: string, V1 error format.
        Allowed values
          1 - v1 error format
          2 - v2 error format

    Returns:
      An object of the form:

        { # A generic empty message that you can re-use to avoid defining duplicated
          # empty messages in your APIs. A typical example is to use it as the request
          # or the response type of an API method. For instance:
          #
          #     service Foo {
          #       rpc Bar(google.protobuf.Empty) returns (google.protobuf.Empty);
          #     }
          #
          # The JSON representation for `Empty` is empty JSON object `{}`.
      }

`get(subscription, x__xgafv=None)`

    Gets the configuration details of a subscription.

    Args:
      subscription: string, The name of the subscription to get. (required)
      x__xgafv: string, V1 error format.
        Allowed values
          1 - v1 error format
          2 - v2 error format

    Returns:
      An object of the form:

        { # A subscription resource.
          "pushConfig": { # Configuration for a push delivery endpoint. # If push delivery is used with this subscription, this field is
              # used to configure it. An empty `pushConfig` signifies that the subscriber
              # will pull and ack messages using API methods.
            "pushEndpoint": "A String", # A URL locating the endpoint to which messages should be pushed.
                # For example, a Webhook endpoint might use "https://example.com/push".
            "attributes": { # Endpoint configuration attributes.
                #
                # Every endpoint has a set of API supported attributes that can be used to
                # control different aspects of the message delivery.
                #
                # The currently supported attribute is `x-goog-version`, which you can
                # use to change the format of the push message. This attribute
                # indicates the version of the data expected by the endpoint. This
                # controls the shape of the envelope (i.e. its fields and metadata).
                # The endpoint version is based on the version of the Pub/Sub
                # API.
                #
                # If not present during the `CreateSubscription` call, it will default to
                # the version of the API used to make such call. If not present during a
                # `ModifyPushConfig` call, its value will not be changed. `GetSubscription`
                # calls will always return a valid version, even if the subscription was
                # created without this attribute.
                #
                # The possible values for this attribute are:
                #
                # * `v1beta1`: uses the push format defined in the v1beta1 Pub/Sub API.
                # * `v1` or `v1beta2`: uses the push format defined in the v1 Pub/Sub API.
              "a_key": "A String",
            },
            "oidcToken": { # Contains information needed for generating an # If specified, Pub/Sub will generate and attach an OIDC JWT token as an
                # `Authorization` header in the HTTP request for every pushed message.
                # [OpenID Connect
                # token](https://developers.google.com/identity/protocols/OpenIDConnect).
              "serviceAccountEmail": "A String", # [Service account
                  # email](https://cloud.google.com/iam/docs/service-accounts)
                  # to be used for generating the OIDC token. The caller (for
                  # CreateSubscription, UpdateSubscription, and ModifyPushConfig RPCs) must
                  # have the iam.serviceAccounts.actAs permission for the service account.
              "audience": "A String", # Audience to be used when generating OIDC token. The audience claim
                  # identifies the recipients that the JWT is intended for. The audience
                  # value is a single case-sensitive string. Having multiple values (array)
                  # for the audience field is not supported. More info about the OIDC JWT
                  # token audience here: https://tools.ietf.org/html/rfc7519#section-4.1.3
                  # Note: if not specified, the Push endpoint URL will be used.
            },
          },
          "name": "A String", # The name of the subscription. It must have the format
              # `"projects/{project}/subscriptions/{subscription}"`. `{subscription}` must
              # start with a letter, and contain only letters (`[A-Za-z]`), numbers
              # (`[0-9]`), dashes (`-`), underscores (`_`), periods (`.`), tildes (`~`),
              # plus (`+`) or percent signs (`%`). It must be between 3 and 255 characters
              # in length, and it must not start with `"goog"`.
          "ackDeadlineSeconds": 42, # This value is the maximum time after a subscriber receives a message
              # before the subscriber should acknowledge the message. After message
              # delivery but before the ack deadline expires and before the message is
              # acknowledged, it is an outstanding message and will not be delivered
              # again during that time (on a best-effort basis).
              #
              # For pull subscriptions, this value is used as the initial value for the ack
              # deadline. To override this value for a given message, call
              # `ModifyAckDeadline` with the corresponding `ack_id` if using pull.
              # The maximum custom deadline you can specify is 600 seconds (10 minutes).
              #
              # For push delivery, this value is also used to set the request timeout for
              # the call to the push endpoint.
              #
              # If the subscriber never acknowledges the message, the Pub/Sub
              # system will eventually redeliver the message.
              #
              # If this parameter is 0, a default value of 10 seconds is used.
          "topic": "A String", # The name of the topic from which this subscription is receiving messages.
              # The value of this field will be `_deleted-topic_` if the topic has been
              # deleted.
        }

`getIamPolicy(resource, options_requestedPolicyVersion=None, x__xgafv=None)`

    Gets the access control policy for a resource.
    Returns an empty policy if the resource exists and does not have a policy
    set.

    Args:
      resource: string, REQUIRED: The resource for which the policy is being requested.
    See the operation documentation for the appropriate value for this field. (required)
      options_requestedPolicyVersion: integer, Optional. The policy format version to be returned.

    Valid values are 0, 1, and 3. Requests specifying an invalid value will be
    rejected.

    Requests for policies with any conditional bindings must specify version 3.
    Policies without any conditional bindings may specify any valid value or
    leave the field unset.

    To learn which resources support conditions in their IAM policies, see the
    [IAM
    documentation](https://cloud.google.com/iam/help/conditions/resource-policies).
      x__xgafv: string, V1 error format.
        Allowed values
          1 - v1 error format
          2 - v2 error format

    Returns:
      An object of the form:

        { # An Identity and Access Management (IAM) policy, which specifies access
          # controls for Google Cloud resources.
          #
          #
          # A `Policy` is a collection of `bindings`. A `binding` binds one or more
          # `members` to a single `role`. Members can be user accounts, service accounts,
          # Google groups, and domains (such as G Suite). A `role` is a named list of
          # permissions; each `role` can be an IAM predefined role or a user-created
          # custom role.
          #
          # For some types of Google Cloud resources, a `binding` can also specify a
          # `condition`, which is a logical expression that allows access to a resource
          # only if the expression evaluates to `true`. A condition can add constraints
          # based on attributes of the request, the resource, or both. To learn which
          # resources support conditions in their IAM policies, see the
          # [IAM documentation](https://cloud.google.com/iam/help/conditions/resource-policies).
          #
          # **JSON example:**
          #
          #     {
          #       "bindings": [
          #         {
          #           "role": "roles/resourcemanager.organizationAdmin",
          #           "members": [
          #             "user:mike@example.com",
          #             "group:admins@example.com",
          #             "domain:google.com",
          #             "serviceAccount:my-project-id@appspot.gserviceaccount.com"
          #           ]
          #         },
          #         {
          #           "role": "roles/resourcemanager.organizationViewer",
          #           "members": [
          #             "user:eve@example.com"
          #           ],
          #           "condition": {
          #             "title": "expirable access",
          #             "description": "Does not grant access after Sep 2020",
          #             "expression": "request.time < timestamp('2020-10-01T00:00:00.000Z')",
          #           }
          #         }
          #       ],
          #       "etag": "BwWWja0YfJA=",
          #       "version": 3
          #     }
          #
          # **YAML example:**
          #
          #     bindings:
          #     - members:
          #       - user:mike@example.com
          #       - group:admins@example.com
          #       - domain:google.com
          #       - serviceAccount:my-project-id@appspot.gserviceaccount.com
          #       role: roles/resourcemanager.organizationAdmin
          #     - members:
          #       - user:eve@example.com
          #       role: roles/resourcemanager.organizationViewer
          #       condition:
          #         title: expirable access
          #         description: Does not grant access after Sep 2020
          #         expression: request.time < timestamp('2020-10-01T00:00:00.000Z')
          #     - etag: BwWWja0YfJA=
          #     - version: 3
          #
          # For a description of IAM and its features, see the
          # [IAM documentation](https://cloud.google.com/iam/docs/).
        "version": 42, # Specifies the format of the policy.
            #
            # Valid values are `0`, `1`, and `3`. Requests that specify an invalid value
            # are rejected.
            #
            # Any operation that affects conditional role bindings must specify version
            # `3`. This requirement applies to the following operations:
            #
            # * Getting a policy that includes a conditional role binding
            # * Adding a conditional role binding to a policy
            # * Changing a conditional role binding in a policy
            # * Removing any role binding, with or without a condition, from a policy
            #   that includes conditions
            #
            # **Important:** If you use IAM Conditions, you must include the `etag` field
            # whenever you call `setIamPolicy`. If you omit this field, then IAM allows
            # you to overwrite a version `3` policy with a version `1` policy, and all of
            # the conditions in the version `3` policy are lost.
            #
            # If a policy does not include any conditions, operations on that policy may
            # specify any valid version or leave the field unset.
            #
            # To learn which resources support conditions in their IAM policies, see the
            # [IAM documentation](https://cloud.google.com/iam/help/conditions/resource-policies).
        "etag": "A String", # `etag` is used for optimistic concurrency control as a way to help
            # prevent simultaneous updates of a policy from overwriting each other.
            # It is strongly suggested that systems make use of the `etag` in the
            # read-modify-write cycle to perform policy updates in order to avoid race
            # conditions: An `etag` is returned in the response to `getIamPolicy`, and
            # systems are expected to put that etag in the request to `setIamPolicy` to
            # ensure that their change will be applied to the same version of the policy.
            #
            # **Important:** If you use IAM Conditions, you must include the `etag` field
            # whenever you call `setIamPolicy`. If you omit this field, then IAM allows
            # you to overwrite a version `3` policy with a version `1` policy, and all of
            # the conditions in the version `3` policy are lost.
        "bindings": [ # Associates a list of `members` to a `role`. Optionally, may specify a
            # `condition` that determines how and when the `bindings` are applied. Each
            # of the `bindings` must contain at least one member.
          { # Associates `members` with a `role`.
            "role": "A String", # Role that is assigned to `members`.
                # For example, `roles/viewer`, `roles/editor`, or `roles/owner`.
            "condition": { # Represents a textual expression in the Common Expression Language (CEL) # The condition that is associated with this binding.
                #
                # If the condition evaluates to `true`, then this binding applies to the
                # current request.
                #
                # If the condition evaluates to `false`, then this binding does not apply to
                # the current request. However, a different role binding might grant the same
                # role to one or more of the members in this binding.
                #
                # To learn which resources support conditions in their IAM policies, see the
                # [IAM
                # documentation](https://cloud.google.com/iam/help/conditions/resource-policies).
                # syntax. CEL is a C-like expression language. The syntax and semantics of CEL
                # are documented at https://github.com/google/cel-spec.
                #
                # Example (Comparison):
                #
                #     title: "Summary size limit"
                #     description: "Determines if a summary is less than 100 chars"
                #     expression: "document.summary.size() < 100"
                #
                # Example (Equality):
                #
                #     title: "Requestor is owner"
                #     description: "Determines if requestor is the document owner"
                #     expression: "document.owner == request.auth.claims.email"
                #
                # Example (Logic):
                #
                #     title: "Public documents"
                #     description: "Determine whether the document should be publicly visible"
                #     expression: "document.type != 'private' && document.type != 'internal'"
                #
                # Example (Data Manipulation):
                #
                #     title: "Notification string"
                #     description: "Create a notification string with a timestamp."
                #     expression: "'New message received at ' + string(document.create_time)"
                #
                # The exact variables and functions that may be referenced within an expression
                # are determined by the service that evaluates it. See the service
                # documentation for additional information.
              "title": "A String", # Optional. Title for the expression, i.e. a short string describing
                  # its purpose. This can be used e.g. in UIs which allow to enter the
                  # expression.
              "description": "A String", # Optional. Description of the expression. This is a longer text which
                  # describes the expression, e.g. when hovered over it in a UI.
              "expression": "A String", # Textual representation of an expression in Common Expression Language
                  # syntax.
              "location": "A String", # Optional. String indicating the location of the expression for error
                  # reporting, e.g. a file name and a position in the file.
            },
            "members": [ # Specifies the identities requesting access for a Cloud Platform resource.
                # `members` can have the following values:
                #
                # * `allUsers`: A special identifier that represents anyone who is
                #    on the internet; with or without a Google account.
                #
                # * `allAuthenticatedUsers`: A special identifier that represents anyone
                #    who is authenticated with a Google account or a service account.
                #
                # * `user:{emailid}`: An email address that represents a specific Google
                #    account. For example, `alice@example.com` .
                #
                #
                # * `serviceAccount:{emailid}`: An email address that represents a service
                #    account. For example, `my-other-app@appspot.gserviceaccount.com`.
                #
                # * `group:{emailid}`: An email address that represents a Google group.
                #    For example, `admins@example.com`.
                #
                # * `deleted:user:{emailid}?uid={uniqueid}`: An email address (plus unique
                #    identifier) representing a user that has been recently deleted. For
                #    example, `alice@example.com?uid=123456789012345678901`. If the user is
                #    recovered, this value reverts to `user:{emailid}` and the recovered user
                #    retains the role in the binding.
                #
                # * `deleted:serviceAccount:{emailid}?uid={uniqueid}`: An email address (plus
                #    unique identifier) representing a service account that has been recently
                #    deleted. For example,
                #    `my-other-app@appspot.gserviceaccount.com?uid=123456789012345678901`.
                #    If the service account is undeleted, this value reverts to
                #    `serviceAccount:{emailid}` and the undeleted service account retains the
                #    role in the binding.
                #
                # * `deleted:group:{emailid}?uid={uniqueid}`: An email address (plus unique
                #    identifier) representing a Google group that has been recently
                #    deleted. For example, `admins@example.com?uid=123456789012345678901`. If
                #    the group is recovered, this value reverts to `group:{emailid}` and the
                #    recovered group retains the role in the binding.
                #
                #
                # * `domain:{domain}`: The G Suite domain (primary) that represents all the
                #    users of that domain. For example, `google.com` or `example.com`.
                #
              "A String",
            ],
          },
        ],
      }

`list(project, pageToken=None, pageSize=None, x__xgafv=None)`

    Lists matching subscriptions.

    Args:
      project: string, The name of the cloud project that subscriptions belong to. (required)
      pageToken: string, The value returned by the last `ListSubscriptionsResponse`; indicates that
    this is a continuation of a prior `ListSubscriptions` call, and that the
    system should return the next page of data.
      pageSize: integer, Maximum number of subscriptions to return.
      x__xgafv: string, V1 error format.
        Allowed values
          1 - v1 error format
          2 - v2 error format

    Returns:
      An object of the form:

        { # Response for the `ListSubscriptions` method.
        "nextPageToken": "A String", # If not empty, indicates that there may be more subscriptions that match
            # the request; this value should be passed in a new
            # `ListSubscriptionsRequest` to get more subscriptions.
        "subscriptions": [ # The subscriptions that match the request.
          { # A subscription resource.
              "pushConfig": { # Configuration for a push delivery endpoint. # If push delivery is used with this subscription, this field is
                  # used to configure it. An empty `pushConfig` signifies that the subscriber
                  # will pull and ack messages using API methods.
                "pushEndpoint": "A String", # A URL locating the endpoint to which messages should be pushed.
                    # For example, a Webhook endpoint might use "https://example.com/push".
                "attributes": { # Endpoint configuration attributes.
                    #
                    # Every endpoint has a set of API supported attributes that can be used to
                    # control different aspects of the message delivery.
                    #
                    # The currently supported attribute is `x-goog-version`, which you can
                    # use to change the format of the push message. This attribute
                    # indicates the version of the data expected by the endpoint. This
                    # controls the shape of the envelope (i.e. its fields and metadata).
                    # The endpoint version is based on the version of the Pub/Sub
                    # API.
                    #
                    # If not present during the `CreateSubscription` call, it will default to
                    # the version of the API used to make such call. If not present during a
                    # `ModifyPushConfig` call, its value will not be changed. `GetSubscription`
                    # calls will always return a valid version, even if the subscription was
                    # created without this attribute.
                    #
                    # The possible values for this attribute are:
                    #
                    # * `v1beta1`: uses the push format defined in the v1beta1 Pub/Sub API.
                    # * `v1` or `v1beta2`: uses the push format defined in the v1 Pub/Sub API.
                  "a_key": "A String",
                },
                "oidcToken": { # Contains information needed for generating an # If specified, Pub/Sub will generate and attach an OIDC JWT token as an
                    # `Authorization` header in the HTTP request for every pushed message.
                    # [OpenID Connect
                    # token](https://developers.google.com/identity/protocols/OpenIDConnect).
                  "serviceAccountEmail": "A String", # [Service account
                      # email](https://cloud.google.com/iam/docs/service-accounts)
                      # to be used for generating the OIDC token. The caller (for
                      # CreateSubscription, UpdateSubscription, and ModifyPushConfig RPCs) must
                      # have the iam.serviceAccounts.actAs permission for the service account.
                  "audience": "A String", # Audience to be used when generating OIDC token. The audience claim
                      # identifies the recipients that the JWT is intended for. The audience
                      # value is a single case-sensitive string. Having multiple values (array)
                      # for the audience field is not supported. More info about the OIDC JWT
                      # token audience here: https://tools.ietf.org/html/rfc7519#section-4.1.3
                      # Note: if not specified, the Push endpoint URL will be used.
                },
              },
              "name": "A String", # The name of the subscription. It must have the format
                  # `"projects/{project}/subscriptions/{subscription}"`. `{subscription}` must
                  # start with a letter, and contain only letters (`[A-Za-z]`), numbers
                  # (`[0-9]`), dashes (`-`), underscores (`_`), periods (`.`), tildes (`~`),
                  # plus (`+`) or percent signs (`%`). It must be between 3 and 255 characters
                  # in length, and it must not start with `"goog"`.
              "ackDeadlineSeconds": 42, # This value is the maximum time after a subscriber receives a message
                  # before the subscriber should acknowledge the message. After message
                  # delivery but before the ack deadline expires and before the message is
                  # acknowledged, it is an outstanding message and will not be delivered
                  # again during that time (on a best-effort basis).
                  #
                  # For pull subscriptions, this value is used as the initial value for the ack
                  # deadline. To override this value for a given message, call
                  # `ModifyAckDeadline` with the corresponding `ack_id` if using pull.
                  # The maximum custom deadline you can specify is 600 seconds (10 minutes).
                  #
                  # For push delivery, this value is also used to set the request timeout for
                  # the call to the push endpoint.
                  #
                  # If the subscriber never acknowledges the message, the Pub/Sub
                  # system will eventually redeliver the message.
                  #
                  # If this parameter is 0, a default value of 10 seconds is used.
              "topic": "A String", # The name of the topic from which this subscription is receiving messages.
                  # The value of this field will be `_deleted-topic_` if the topic has been
                  # deleted.
            },
        ],
      }

`list_next(previous_request, previous_response)`

    Retrieves the next page of results.

    Args:
      previous_request: The request for the previous page. (required)
      previous_response: The response from the request for the previous page. (required)

    Returns:
      A request object that you can call 'execute()' on to request the next
      page. Returns None if there are no more items in the collection.

`modifyAckDeadline(subscription, body=None, x__xgafv=None)`

    Modifies the ack deadline for a specific message. This method is useful
    to indicate that more time is needed to process a message by the
    subscriber, or to make the message available for redelivery if the
    processing was interrupted. Note that this does not modify the
    subscription-level `ackDeadlineSeconds` used for subsequent messages.

    Args:
      subscription: string, The name of the subscription. (required)
      body: object, The request body.
        The object takes the form of:

    { # Request for the ModifyAckDeadline method.
        "ackIds": [ # List of acknowledgment IDs.
          "A String",
        ],
        "ackId": "A String", # The acknowledgment ID. Either this or ack_ids must be populated, but not
            # both.
        "ackDeadlineSeconds": 42, # The new ack deadline with respect to the time this request was sent to
            # the Pub/Sub system. Must be >= 0. For example, if the value is 10, the new
            # ack deadline will expire 10 seconds after the `ModifyAckDeadline` call
            # was made. Specifying zero may immediately make the message available for
            # another pull request.
      }

      x__xgafv: string, V1 error format.
        Allowed values
          1 - v1 error format
          2 - v2 error format

    Returns:
      An object of the form:

        { # A generic empty message that you can re-use to avoid defining duplicated
          # empty messages in your APIs. A typical example is to use it as the request
          # or the response type of an API method. For instance:
          #
          #     service Foo {
          #       rpc Bar(google.protobuf.Empty) returns (google.protobuf.Empty);
          #     }
          #
          # The JSON representation for `Empty` is empty JSON object `{}`.
      }

`modifyPushConfig(subscription, body=None, x__xgafv=None)`

    Modifies the `PushConfig` for a specified subscription.

    This may be used to change a push subscription to a pull one (signified by
    an empty `PushConfig`) or vice versa, or change the endpoint URL and other
    attributes of a push subscription. Messages will accumulate for delivery
    continuously through the call regardless of changes to the `PushConfig`.

    Args:
      subscription: string, The name of the subscription. (required)
      body: object, The request body.
        The object takes the form of:

    { # Request for the ModifyPushConfig method.
        "pushConfig": { # Configuration for a push delivery endpoint. # The push configuration for future deliveries.
            #
            # An empty `pushConfig` indicates that the Pub/Sub system should
            # stop pushing messages from the given subscription and allow
            # messages to be pulled and acknowledged - effectively pausing
            # the subscription if `Pull` is not called.
          "pushEndpoint": "A String", # A URL locating the endpoint to which messages should be pushed.
              # For example, a Webhook endpoint might use "https://example.com/push".
          "attributes": { # Endpoint configuration attributes.
              #
              # Every endpoint has a set of API supported attributes that can be used to
              # control different aspects of the message delivery.
              #
              # The currently supported attribute is `x-goog-version`, which you can
              # use to change the format of the push message. This attribute
              # indicates the version of the data expected by the endpoint. This
              # controls the shape of the envelope (i.e. its fields and metadata).
              # The endpoint version is based on the version of the Pub/Sub
              # API.
              #
              # If not present during the `CreateSubscription` call, it will default to
              # the version of the API used to make such call. If not present during a
              # `ModifyPushConfig` call, its value will not be changed. `GetSubscription`
              # calls will always return a valid version, even if the subscription was
              # created without this attribute.
              #
              # The possible values for this attribute are:
              #
              # * `v1beta1`: uses the push format defined in the v1beta1 Pub/Sub API.
              # * `v1` or `v1beta2`: uses the push format defined in the v1 Pub/Sub API.
            "a_key": "A String",
          },
          "oidcToken": { # Contains information needed for generating an # If specified, Pub/Sub will generate and attach an OIDC JWT token as an
              # `Authorization` header in the HTTP request for every pushed message.
              # [OpenID Connect
              # token](https://developers.google.com/identity/protocols/OpenIDConnect).
            "serviceAccountEmail": "A String", # [Service account
                # email](https://cloud.google.com/iam/docs/service-accounts)
                # to be used for generating the OIDC token. The caller (for
                # CreateSubscription, UpdateSubscription, and ModifyPushConfig RPCs) must
                # have the iam.serviceAccounts.actAs permission for the service account.
            "audience": "A String", # Audience to be used when generating OIDC token. The audience claim
                # identifies the recipients that the JWT is intended for. The audience
                # value is a single case-sensitive string. Having multiple values (array)
                # for the audience field is not supported. More info about the OIDC JWT
                # token audience here: https://tools.ietf.org/html/rfc7519#section-4.1.3
                # Note: if not specified, the Push endpoint URL will be used.
          },
        },
      }

      x__xgafv: string, V1 error format.
        Allowed values
          1 - v1 error format
          2 - v2 error format

    Returns:
      An object of the form:

        { # A generic empty message that you can re-use to avoid defining duplicated
          # empty messages in your APIs. A typical example is to use it as the request
          # or the response type of an API method. For instance:
          #
          #     service Foo {
          #       rpc Bar(google.protobuf.Empty) returns (google.protobuf.Empty);
          #     }
          #
          # The JSON representation for `Empty` is empty JSON object `{}`.
      }

`pull(subscription, body=None, x__xgafv=None)`

    Pulls messages from the server. Returns an empty list if there are no
    messages available in the backlog. The server may return `UNAVAILABLE` if
    there are too many concurrent pull requests pending for the given
    subscription.

    Args:
      subscription: string, The subscription from which messages should be pulled. (required)
      body: object, The request body.
        The object takes the form of:

    { # Request for the `Pull` method.
        "returnImmediately": True or False, # Optional. If this is specified as true the system will respond immediately even if
            # it is not able to return a message in the `Pull` response. Otherwise the
            # system is allowed to wait until at least one message is available rather
            # than returning no messages. The client may cancel the request if it does
            # not wish to wait any longer for the response. Warning: setting this field
            # to `true` is discouraged because it adversely impacts the performance of
            # `Pull` operations. We recommend that users do not set this field.
        "maxMessages": 42, # The maximum number of messages returned for this request. The Pub/Sub
            # system may return fewer than the number specified.
      }

      x__xgafv: string, V1 error format.
        Allowed values
          1 - v1 error format
          2 - v2 error format

    Returns:
      An object of the form:

        { # Response for the `Pull` method.
        "receivedMessages": [ # Received Pub/Sub messages. The Pub/Sub system will return zero messages if
            # there are no more available in the backlog. The Pub/Sub system may return
            # fewer than the `maxMessages` requested even if there are more messages
            # available in the backlog.
          { # A message and its corresponding acknowledgment ID.
            "message": { # A message data and its attributes. The message payload must not be empty; # The message.
                # it must contain either a non-empty data field, or at least one attribute.
              "messageId": "A String", # ID of this message, assigned by the server when the message is published.
                  # Guaranteed to be unique within the topic. This value may be read by a
                  # subscriber that receives a `PubsubMessage` via a `Pull` call or a push
                  # delivery. It must not be populated by the publisher in a `Publish` call.
              "data": "A String", # The message payload. For JSON requests, the value of this field must be
                  # [base64-encoded](https://tools.ietf.org/html/rfc4648).
              "publishTime": "A String", # The time at which the message was published, populated by the server when
                  # it receives the `Publish` call. It must not be populated by the
                  # publisher in a `Publish` call.
              "attributes": { # Optional attributes for this message.
                "a_key": "A String",
              },
            },
            "ackId": "A String", # This ID can be used to acknowledge the received message.
          },
        ],
      }

`setIamPolicy(resource, body=None, x__xgafv=None)`

    Sets the access control policy on the specified resource. Replaces any
    existing policy.

    Can return `NOT_FOUND`, `INVALID_ARGUMENT`, and `PERMISSION_DENIED` errors.

    Args:
      resource: string, REQUIRED: The resource for which the policy is being specified.
    See the operation documentation for the appropriate value for this field. (required)
      body: object, The request body.
        The object takes the form of:

    { # Request message for `SetIamPolicy` method.
        "policy": { # An Identity and Access Management (IAM) policy, which specifies access # REQUIRED: The complete policy to be applied to the `resource`. The size of
            # the policy is limited to a few 10s of KB. An empty policy is a
            # valid policy but certain Cloud Platform services (such as Projects)
            # might reject them.
            # controls for Google Cloud resources.
            #
            #
            # A `Policy` is a collection of `bindings`. A `binding` binds one or more
            # `members` to a single `role`. Members can be user accounts, service accounts,
            # Google groups, and domains (such as G Suite). A `role` is a named list of
            # permissions; each `role` can be an IAM predefined role or a user-created
            # custom role.
            #
            # For some types of Google Cloud resources, a `binding` can also specify a
            # `condition`, which is a logical expression that allows access to a resource
            # only if the expression evaluates to `true`. A condition can add constraints
            # based on attributes of the request, the resource, or both. To learn which
            # resources support conditions in their IAM policies, see the
            # [IAM documentation](https://cloud.google.com/iam/help/conditions/resource-policies).
            #
            # **JSON example:**
            #
            #     {
            #       "bindings": [
            #         {
            #           "role": "roles/resourcemanager.organizationAdmin",
            #           "members": [
            #             "user:mike@example.com",
            #             "group:admins@example.com",
            #             "domain:google.com",
            #             "serviceAccount:my-project-id@appspot.gserviceaccount.com"
            #           ]
            #         },
            #         {
            #           "role": "roles/resourcemanager.organizationViewer",
            #           "members": [
            #             "user:eve@example.com"
            #           ],
            #           "condition": {
            #             "title": "expirable access",
            #             "description": "Does not grant access after Sep 2020",
            #             "expression": "request.time < timestamp('2020-10-01T00:00:00.000Z')",
            #           }
            #         }
            #       ],
            #       "etag": "BwWWja0YfJA=",
            #       "version": 3
            #     }
            #
            # **YAML example:**
            #
            #     bindings:
            #     - members:
            #       - user:mike@example.com
            #       - group:admins@example.com
            #       - domain:google.com
            #       - serviceAccount:my-project-id@appspot.gserviceaccount.com
            #       role: roles/resourcemanager.organizationAdmin
            #     - members:
            #       - user:eve@example.com
            #       role: roles/resourcemanager.organizationViewer
            #       condition:
            #         title: expirable access
            #         description: Does not grant access after Sep 2020
            #         expression: request.time < timestamp('2020-10-01T00:00:00.000Z')
            #     - etag: BwWWja0YfJA=
            #     - version: 3
            #
            # For a description of IAM and its features, see the
            # [IAM documentation](https://cloud.google.com/iam/docs/).
          "version": 42, # Specifies the format of the policy.
              #
              # Valid values are `0`, `1`, and `3`. Requests that specify an invalid value
              # are rejected.
              #
              # Any operation that affects conditional role bindings must specify version
              # `3`. This requirement applies to the following operations:
              #
              # * Getting a policy that includes a conditional role binding
              # * Adding a conditional role binding to a policy
              # * Changing a conditional role binding in a policy
              # * Removing any role binding, with or without a condition, from a policy
              #   that includes conditions
              #
              # **Important:** If you use IAM Conditions, you must include the `etag` field
              # whenever you call `setIamPolicy`. If you omit this field, then IAM allows
              # you to overwrite a version `3` policy with a version `1` policy, and all of
              # the conditions in the version `3` policy are lost.
              #
              # If a policy does not include any conditions, operations on that policy may
              # specify any valid version or leave the field unset.
              #
              # To learn which resources support conditions in their IAM policies, see the
              # [IAM documentation](https://cloud.google.com/iam/help/conditions/resource-policies).
          "etag": "A String", # `etag` is used for optimistic concurrency control as a way to help
              # prevent simultaneous updates of a policy from overwriting each other.
              # It is strongly suggested that systems make use of the `etag` in the
              # read-modify-write cycle to perform policy updates in order to avoid race
              # conditions: An `etag` is returned in the response to `getIamPolicy`, and
              # systems are expected to put that etag in the request to `setIamPolicy` to
              # ensure that their change will be applied to the same version of the policy.
              #
              # **Important:** If you use IAM Conditions, you must include the `etag` field
              # whenever you call `setIamPolicy`. If you omit this field, then IAM allows
              # you to overwrite a version `3` policy with a version `1` policy, and all of
              # the conditions in the version `3` policy are lost.
          "bindings": [ # Associates a list of `members` to a `role`. Optionally, may specify a
              # `condition` that determines how and when the `bindings` are applied. Each
              # of the `bindings` must contain at least one member.
            { # Associates `members` with a `role`.
              "role": "A String", # Role that is assigned to `members`.
                  # For example, `roles/viewer`, `roles/editor`, or `roles/owner`.
              "condition": { # Represents a textual expression in the Common Expression Language (CEL) # The condition that is associated with this binding.
                  #
                  # If the condition evaluates to `true`, then this binding applies to the
                  # current request.
                  #
                  # If the condition evaluates to `false`, then this binding does not apply to
                  # the current request. However, a different role binding might grant the same
                  # role to one or more of the members in this binding.
                  #
                  # To learn which resources support conditions in their IAM policies, see the
                  # [IAM
                  # documentation](https://cloud.google.com/iam/help/conditions/resource-policies).
                  # syntax. CEL is a C-like expression language. The syntax and semantics of CEL
                  # are documented at https://github.com/google/cel-spec.
                  #
                  # Example (Comparison):
                  #
                  #     title: "Summary size limit"
                  #     description: "Determines if a summary is less than 100 chars"
                  #     expression: "document.summary.size() < 100"
                  #
                  # Example (Equality):
                  #
                  #     title: "Requestor is owner"
                  #     description: "Determines if requestor is the document owner"
                  #     expression: "document.owner == request.auth.claims.email"
                  #
                  # Example (Logic):
                  #
                  #     title: "Public documents"
                  #     description: "Determine whether the document should be publicly visible"
                  #     expression: "document.type != 'private' && document.type != 'internal'"
                  #
                  # Example (Data Manipulation):
                  #
                  #     title: "Notification string"
                  #     description: "Create a notification string with a timestamp."
                  #     expression: "'New message received at ' + string(document.create_time)"
                  #
                  # The exact variables and functions that may be referenced within an expression
                  # are determined by the service that evaluates it. See the service
                  # documentation for additional information.
                "title": "A String", # Optional. Title for the expression, i.e. a short string describing
                    # its purpose. This can be used e.g. in UIs which allow to enter the
                    # expression.
                "description": "A String", # Optional. Description of the expression. This is a longer text which
                    # describes the expression, e.g. when hovered over it in a UI.
                "expression": "A String", # Textual representation of an expression in Common Expression Language
                    # syntax.
                "location": "A String", # Optional. String indicating the location of the expression for error
                    # reporting, e.g. a file name and a position in the file.
              },
              "members": [ # Specifies the identities requesting access for a Cloud Platform resource.
                  # `members` can have the following values:
                  #
                  # * `allUsers`: A special identifier that represents anyone who is
                  #    on the internet; with or without a Google account.
                  #
                  # * `allAuthenticatedUsers`: A special identifier that represents anyone
                  #    who is authenticated with a Google account or a service account.
                  #
                  # * `user:{emailid}`: An email address that represents a specific Google
                  #    account. For example, `alice@example.com` .
                  #
                  #
                  # * `serviceAccount:{emailid}`: An email address that represents a service
                  #    account. For example, `my-other-app@appspot.gserviceaccount.com`.
                  #
                  # * `group:{emailid}`: An email address that represents a Google group.
                  #    For example, `admins@example.com`.
                  #
                  # * `deleted:user:{emailid}?uid={uniqueid}`: An email address (plus unique
                  #    identifier) representing a user that has been recently deleted. For
                  #    example, `alice@example.com?uid=123456789012345678901`. If the user is
                  #    recovered, this value reverts to `user:{emailid}` and the recovered user
                  #    retains the role in the binding.
                  #
                  # * `deleted:serviceAccount:{emailid}?uid={uniqueid}`: An email address (plus
                  #    unique identifier) representing a service account that has been recently
                  #    deleted. For example,
                  #    `my-other-app@appspot.gserviceaccount.com?uid=123456789012345678901`.
                  #    If the service account is undeleted, this value reverts to
                  #    `serviceAccount:{emailid}` and the undeleted service account retains the
                  #    role in the binding.
                  #
                  # * `deleted:group:{emailid}?uid={uniqueid}`: An email address (plus unique
                  #    identifier) representing a Google group that has been recently
                  #    deleted. For example, `admins@example.com?uid=123456789012345678901`. If
                  #    the group is recovered, this value reverts to `group:{emailid}` and the
                  #    recovered group retains the role in the binding.
                  #
                  #
                  # * `domain:{domain}`: The G Suite domain (primary) that represents all the
                  #    users of that domain. For example, `google.com` or `example.com`.
                  #
                "A String",
              ],
            },
          ],
        },
      }

      x__xgafv: string, V1 error format.
        Allowed values
          1 - v1 error format
          2 - v2 error format

    Returns:
      An object of the form:

        { # An Identity and Access Management (IAM) policy, which specifies access
          # controls for Google Cloud resources.
          #
          #
          # A `Policy` is a collection of `bindings`. A `binding` binds one or more
          # `members` to a single `role`. Members can be user accounts, service accounts,
          # Google groups, and domains (such as G Suite). A `role` is a named list of
          # permissions; each `role` can be an IAM predefined role or a user-created
          # custom role.
          #
          # For some types of Google Cloud resources, a `binding` can also specify a
          # `condition`, which is a logical expression that allows access to a resource
          # only if the expression evaluates to `true`. A condition can add constraints
          # based on attributes of the request, the resource, or both. To learn which
          # resources support conditions in their IAM policies, see the
          # [IAM documentation](https://cloud.google.com/iam/help/conditions/resource-policies).
          #
          # **JSON example:**
          #
          #     {
          #       "bindings": [
          #         {
          #           "role": "roles/resourcemanager.organizationAdmin",
          #           "members": [
          #             "user:mike@example.com",
          #             "group:admins@example.com",
          #             "domain:google.com",
          #             "serviceAccount:my-project-id@appspot.gserviceaccount.com"
          #           ]
          #         },
          #         {
          #           "role": "roles/resourcemanager.organizationViewer",
          #           "members": [
          #             "user:eve@example.com"
          #           ],
          #           "condition": {
          #             "title": "expirable access",
          #             "description": "Does not grant access after Sep 2020",
          #             "expression": "request.time < timestamp('2020-10-01T00:00:00.000Z')",
          #           }
          #         }
          #       ],
          #       "etag": "BwWWja0YfJA=",
          #       "version": 3
          #     }
          #
          # **YAML example:**
          #
          #     bindings:
          #     - members:
          #       - user:mike@example.com
          #       - group:admins@example.com
          #       - domain:google.com
          #       - serviceAccount:my-project-id@appspot.gserviceaccount.com
          #       role: roles/resourcemanager.organizationAdmin
          #     - members:
          #       - user:eve@example.com
          #       role: roles/resourcemanager.organizationViewer
          #       condition:
          #         title: expirable access
          #         description: Does not grant access after Sep 2020
          #         expression: request.time < timestamp('2020-10-01T00:00:00.000Z')
          #     - etag: BwWWja0YfJA=
          #     - version: 3
          #
          # For a description of IAM and its features, see the
          # [IAM documentation](https://cloud.google.com/iam/docs/).
        "version": 42, # Specifies the format of the policy.
            #
            # Valid values are `0`, `1`, and `3`. Requests that specify an invalid value
            # are rejected.
            #
            # Any operation that affects conditional role bindings must specify version
            # `3`. This requirement applies to the following operations:
            #
            # * Getting a policy that includes a conditional role binding
            # * Adding a conditional role binding to a policy
            # * Changing a conditional role binding in a policy
            # * Removing any role binding, with or without a condition, from a policy
            #   that includes conditions
            #
            # **Important:** If you use IAM Conditions, you must include the `etag` field
            # whenever you call `setIamPolicy`. If you omit this field, then IAM allows
            # you to overwrite a version `3` policy with a version `1` policy, and all of
            # the conditions in the version `3` policy are lost.
            #
            # If a policy does not include any conditions, operations on that policy may
            # specify any valid version or leave the field unset.
            #
            # To learn which resources support conditions in their IAM policies, see the
            # [IAM documentation](https://cloud.google.com/iam/help/conditions/resource-policies).
        "etag": "A String", # `etag` is used for optimistic concurrency control as a way to help
            # prevent simultaneous updates of a policy from overwriting each other.
            # It is strongly suggested that systems make use of the `etag` in the
            # read-modify-write cycle to perform policy updates in order to avoid race
            # conditions: An `etag` is returned in the response to `getIamPolicy`, and
            # systems are expected to put that etag in the request to `setIamPolicy` to
            # ensure that their change will be applied to the same version of the policy.
            #
            # **Important:** If you use IAM Conditions, you must include the `etag` field
            # whenever you call `setIamPolicy`. If you omit this field, then IAM allows
            # you to overwrite a version `3` policy with a version `1` policy, and all of
            # the conditions in the version `3` policy are lost.
        "bindings": [ # Associates a list of `members` to a `role`. Optionally, may specify a
            # `condition` that determines how and when the `bindings` are applied. Each
            # of the `bindings` must contain at least one member.
          { # Associates `members` with a `role`.
            "role": "A String", # Role that is assigned to `members`.
                # For example, `roles/viewer`, `roles/editor`, or `roles/owner`.
            "condition": { # Represents a textual expression in the Common Expression Language (CEL) # The condition that is associated with this binding.
                #
                # If the condition evaluates to `true`, then this binding applies to the
                # current request.
                #
                # If the condition evaluates to `false`, then this binding does not apply to
                # the current request. However, a different role binding might grant the same
                # role to one or more of the members in this binding.
                #
                # To learn which resources support conditions in their IAM policies, see the
                # [IAM
                # documentation](https://cloud.google.com/iam/help/conditions/resource-policies).
                # syntax. CEL is a C-like expression language. The syntax and semantics of CEL
                # are documented at https://github.com/google/cel-spec.
                #
                # Example (Comparison):
                #
                #     title: "Summary size limit"
                #     description: "Determines if a summary is less than 100 chars"
                #     expression: "document.summary.size() < 100"
                #
                # Example (Equality):
                #
                #     title: "Requestor is owner"
                #     description: "Determines if requestor is the document owner"
                #     expression: "document.owner == request.auth.claims.email"
                #
                # Example (Logic):
                #
                #     title: "Public documents"
                #     description: "Determine whether the document should be publicly visible"
                #     expression: "document.type != 'private' && document.type != 'internal'"
                #
                # Example (Data Manipulation):
                #
                #     title: "Notification string"
                #     description: "Create a notification string with a timestamp."
                #     expression: "'New message received at ' + string(document.create_time)"
                #
                # The exact variables and functions that may be referenced within an expression
                # are determined by the service that evaluates it. See the service
                # documentation for additional information.
              "title": "A String", # Optional. Title for the expression, i.e. a short string describing
                  # its purpose. This can be used e.g. in UIs which allow to enter the
                  # expression.
              "description": "A String", # Optional. Description of the expression. This is a longer text which
                  # describes the expression, e.g. when hovered over it in a UI.
              "expression": "A String", # Textual representation of an expression in Common Expression Language
                  # syntax.
              "location": "A String", # Optional. String indicating the location of the expression for error
                  # reporting, e.g. a file name and a position in the file.
            },
            "members": [ # Specifies the identities requesting access for a Cloud Platform resource.
                # `members` can have the following values:
                #
                # * `allUsers`: A special identifier that represents anyone who is
                #    on the internet; with or without a Google account.
                #
                # * `allAuthenticatedUsers`: A special identifier that represents anyone
                #    who is authenticated with a Google account or a service account.
                #
                # * `user:{emailid}`: An email address that represents a specific Google
                #    account. For example, `alice@example.com` .
                #
                #
                # * `serviceAccount:{emailid}`: An email address that represents a service
                #    account. For example, `my-other-app@appspot.gserviceaccount.com`.
                #
                # * `group:{emailid}`: An email address that represents a Google group.
                #    For example, `admins@example.com`.
                #
                # * `deleted:user:{emailid}?uid={uniqueid}`: An email address (plus unique
                #    identifier) representing a user that has been recently deleted. For
                #    example, `alice@example.com?uid=123456789012345678901`. If the user is
                #    recovered, this value reverts to `user:{emailid}` and the recovered user
                #    retains the role in the binding.
                #
                # * `deleted:serviceAccount:{emailid}?uid={uniqueid}`: An email address (plus
                #    unique identifier) representing a service account that has been recently
                #    deleted. For example,
                #    `my-other-app@appspot.gserviceaccount.com?uid=123456789012345678901`.
                #    If the service account is undeleted, this value reverts to
                #    `serviceAccount:{emailid}` and the undeleted service account retains the
                #    role in the binding.
                #
                # * `deleted:group:{emailid}?uid={uniqueid}`: An email address (plus unique
                #    identifier) representing a Google group that has been recently
                #    deleted. For example, `admins@example.com?uid=123456789012345678901`. If
                #    the group is recovered, this value reverts to `group:{emailid}` and the
                #    recovered group retains the role in the binding.
                #
                #
                # * `domain:{domain}`: The G Suite domain (primary) that represents all the
                #    users of that domain. For example, `google.com` or `example.com`.
                #
              "A String",
            ],
          },
        ],
      }

`testIamPermissions(resource, body=None, x__xgafv=None)`

    Returns permissions that a caller has on the specified resource.
    If the resource does not exist, this will return an empty set of
    permissions, not a `NOT_FOUND` error.

    Note: This operation is designed to be used for building permission-aware
    UIs and command-line tools, not for authorization checking. This operation
    may "fail open" without warning.

    Args:
      resource: string, REQUIRED: The resource for which the policy detail is being requested.
    See the operation documentation for the appropriate value for this field. (required)
      body: object, The request body.
        The object takes the form of:

    { # Request message for `TestIamPermissions` method.
        "permissions": [ # The set of permissions to check for the `resource`. Permissions with
            # wildcards (such as '*' or 'storage.*') are not allowed. For more
            # information see
            # [IAM Overview](https://cloud.google.com/iam/docs/overview#permissions).
          "A String",
        ],
      }

      x__xgafv: string, V1 error format.
        Allowed values
          1 - v1 error format
          2 - v2 error format

    Returns:
      An object of the form:

        { # Response message for `TestIamPermissions` method.
        "permissions": [ # A subset of `TestPermissionsRequest.permissions` that the caller is
            # allowed.
          "A String",
        ],
      }