# -*- coding: utf-8 -*- #
# Copyright 2017 Google Inc. All Rights Reserved.
#
# 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.
"""The Create command for Binary Authorization attestations."""

from __future__ import absolute_import
from __future__ import division
from __future__ import unicode_literals

import textwrap

from googlecloudsdk.api_lib.container.binauthz import apis
from googlecloudsdk.api_lib.container.binauthz import attestors
from googlecloudsdk.api_lib.container.binauthz import containeranalysis
from googlecloudsdk.calliope import base
from googlecloudsdk.command_lib.container.binauthz import flags
from googlecloudsdk.command_lib.container.binauthz import util as binauthz_command_util
from googlecloudsdk.core import properties
from googlecloudsdk.core import resources
from googlecloudsdk.core.console import console_io


@base.ReleaseTracks(base.ReleaseTrack.BETA)
class CreateBeta(base.CreateCommand):
  r"""Create a Binary Authorization attestation.

  This command creates a Binary Authorization attestation for your project. The
  attestation is created for the specified artifact (e.g. a grc.io container
  URL), associate with the specified attestor, and stored under the specified
  project.

  ## EXAMPLES

  To create an attestation in the project "my_proj" as the attestor with
  resource path "projects/foo/attestors/bar", run:

      $ {command} \
          --project=my_proj \
          --artifact-url='gcr.io/example-project/example-image@sha256:abcd' \
          --attestor=projects/foo/attestors/bar \
          --signature-file=signed_artifact_attestation.pgp.sig \
          --pgp-key-fingerprint=AAAA0000000000000000FFFFFFFFFFFFFFFFFFFF
  """

  @classmethod
  def Args(cls, parser):
    flags.AddArtifactUrlFlag(parser)
    parser.add_argument(
        '--signature-file',
        required=True,
        type=str,
        help=textwrap.dedent("""\
          Path to file containing the signature to store, or `-` to read
          signature from stdin."""))

    flags.AddConcepts(
        parser,
        flags.GetAttestorPresentationSpec(
            base_name='attestor',
            required=True,
            positional=False,
            use_global_project_flag=False,
            group_help=textwrap.dedent("""\
              The Attestor whose Container Analysis Note will be used to host
              the created attestation. In order to successfully attach the
              attestation, the active gcloud account (core/account) must
              be able to read this attestor and must have the
              `containeranalysis.notes.attachOccurrence` permission for the
              Attestor's underlying Note resource (usually via the
              `containeranalysis.notes.attacher` role).""")),
    )

    parser.add_argument(
        '--pgp-key-fingerprint',
        required=True,
        type=str,
        help=textwrap.dedent("""\
          The cryptographic ID of the key used to generate the signature.  For
          Binary Authorization, this must be the version 4, full 160-bit
          fingerprint, expressed as a 40 character hexadecimal string.  See
          https://tools.ietf.org/html/rfc4880#section-12.2 for details."""))

  def Run(self, args):
    project_ref = resources.REGISTRY.Parse(
        properties.VALUES.core.project.Get(required=True),
        collection='cloudresourcemanager.projects',
    )
    normalized_artifact_url = binauthz_command_util.NormalizeArtifactUrl(
        args.artifact_url)
    signature = console_io.ReadFromFileOrStdin(args.signature_file, binary=True)

    attestor_ref = args.CONCEPTS.attestor.Parse()
    api_version = apis.GetApiVersion(self.ReleaseTrack())
    attestor = attestors.Client(api_version).Get(attestor_ref)
    # TODO(b/79709480): Add other types of attestors if/when supported.
    note_ref = resources.REGISTRY.ParseResourceId(
        'containeranalysis.projects.notes',
        attestor.userOwnedDrydockNote.noteReference, {})

    return containeranalysis.Client().CreatePgpAttestationOccurrence(
        project_ref=project_ref,
        note_ref=note_ref,
        artifact_url=normalized_artifact_url,
        pgp_key_fingerprint=args.pgp_key_fingerprint,
        signature=signature,
    )


@base.ReleaseTracks(base.ReleaseTrack.ALPHA)
class CreateAlpha(base.CreateCommand):
  r"""Create a Binary Authorization attestation.

  This command creates a Binary Authorization attestation for your project. The
  attestation is created for the specified artifact (e.g. a grc.io container
  URL), associate with the specified attestor, and stored under the specified
  project.

  ## EXAMPLES

  To create an attestation in the project "my_proj" as the attestor with
  resource path "projects/foo/attestors/bar", run:

      $ {command} \
          --project=my_proj \
          --artifact-url='gcr.io/example-project/example-image@sha256:abcd' \
          --attestor=projects/foo/attestors/bar \
          --signature-file=signed_artifact_attestation.pgp.sig \
          --public-key-id=AAAA0000000000000000FFFFFFFFFFFFFFFFFFFF
  """

  @classmethod
  def Args(cls, parser):
    flags.AddArtifactUrlFlag(parser)
    parser.add_argument(
        '--signature-file',
        required=True,
        type=str,
        help=textwrap.dedent("""\
          Path to file containing the signature to store, or `-` to read
          signature from stdin."""))

    flags.AddConcepts(
        parser,
        flags.GetAttestorPresentationSpec(
            base_name='attestor',
            required=True,
            positional=False,
            use_global_project_flag=False,
            group_help=textwrap.dedent("""\
              The Attestor whose Container Analysis Note will be used to host
              the created attestation. In order to successfully attach the
              attestation, the active gcloud account (core/account) must
              be able to read this attestor and must have the
              `containeranalysis.notes.attachOccurrence` permission for the
              Attestor's underlying Note resource (usually via the
              `containeranalysis.notes.attacher` role).""")),
    )

    parser.add_argument(
        '--public-key-id',
        required=True,
        type=str,
        help=textwrap.dedent("""\
          The ID of the public key that will be used to verify the signature
          of the created Attestation. This ID should match the one found on the
          Attestor resource(s) which will use this Attestation.

          For PKIX keys, this will be the URI-formatted `id` field of the
          associated Attestor public key.

          For PGP keys, this must be the version 4, full 160-bit fingerprint,
          expressed as a 40 character hexadecimal string. See
          https://tools.ietf.org/html/rfc4880#section-12.2 for details."""))

  def Run(self, args):
    project_ref = resources.REGISTRY.Parse(
        properties.VALUES.core.project.Get(required=True),
        collection='cloudresourcemanager.projects',
    )
    normalized_artifact_url = binauthz_command_util.NormalizeArtifactUrl(
        args.artifact_url)
    signature = console_io.ReadFromFileOrStdin(args.signature_file, binary=True)

    attestor_ref = args.CONCEPTS.attestor.Parse()
    api_version = apis.GetApiVersion(self.ReleaseTrack())
    attestor = attestors.Client(api_version).Get(attestor_ref)
    # TODO(b/79709480): Add other types of attestors if/when supported.
    note_ref = resources.REGISTRY.ParseResourceId(
        'containeranalysis.projects.notes',
        attestor.userOwnedDrydockNote.noteReference, {})

    return containeranalysis.Client().CreateGenericAttestationOccurrence(
        project_ref=project_ref,
        note_ref=note_ref,
        artifact_url=normalized_artifact_url,
        public_key_id=args.public_key_id,
        signature=signature,
        plaintext=binauthz_command_util.MakeSignaturePayload(
            normalized_artifact_url),
    )
