"""
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements.  See the NOTICE file
distributed with this work for additional information
regarding copyright ownership.  The ASF licenses this file
to you 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.

"""

from resource_management import *
from resource_management.libraries.functions.security_commons import build_expectations, \
  cached_kinit_executor, get_params_from_filesystem, validate_security_config_properties, \
  FILE_TYPE_XML
from hdfs import hdfs
from utils import service


class HdfsClient(Script):

  def get_stack_to_component(self):
    return {"HDP": "hadoop-client"}

  def install(self, env):
    import params

    self.install_packages(env, params.exclude_packages)
    env.set_params(params)
    self.config(env)

  def pre_rolling_restart(self, env):
    import params
    env.set_params(params)
    if params.version and compare_versions(format_hdp_stack_version(params.version), '2.2.0.0') >= 0:
      Execute(format("hdp-select set hadoop-client {version}"))

  def start(self, env, rolling_restart=False):
    import params

    env.set_params(params)

  def stop(self, env, rolling_restart=False):
    import params

    env.set_params(params)

  def status(self, env):
    raise ClientComponentHasNoStatus()

  def config(self, env):
    import params
    hdfs()

  def security_status(self, env):
    import status_params
    env.set_params(status_params)

    props_value_check = {"hadoop.security.authentication": "kerberos",
                         "hadoop.security.authorization": "true"}
    props_empty_check = ["hadoop.security.auth_to_local"]
    props_read_check = None
    core_site_expectations = build_expectations('core-site', props_value_check, props_empty_check,
                                                props_read_check)
    hdfs_expectations ={}
    hdfs_expectations.update(core_site_expectations)

    security_params = get_params_from_filesystem(status_params.hadoop_conf_dir,
                                                   {'core-site.xml': FILE_TYPE_XML})

    if 'core-site' in security_params and 'hadoop.security.authentication' in security_params['core-site'] and \
        security_params['core-site']['hadoop.security.authentication'].lower() == 'kerberos':
      result_issues = validate_security_config_properties(security_params, hdfs_expectations)
      if not result_issues: # If all validations passed successfully
        if status_params.hdfs_user_principal or status_params.hdfs_user_keytab:
          try:
            cached_kinit_executor(status_params.kinit_path_local,
                       status_params.hdfs_user,
                       status_params.hdfs_user_keytab,
                       status_params.hdfs_user_principal,
                       status_params.hostname,
                       status_params.tmp_dir)
            self.put_structured_out({"securityState": "SECURED_KERBEROS"})
          except Exception as e:
            self.put_structured_out({"securityState": "ERROR"})
            self.put_structured_out({"securityStateErrorInfo": str(e)})
        else:
          self.put_structured_out({"securityIssuesFound": "hdfs principal and/or keytab file is not specified"})
          self.put_structured_out({"securityState": "UNSECURED"})
      else:
        issues = []
        for cf in result_issues:
          issues.append("Configuration file %s did not pass the validation. Reason: %s" % (cf, result_issues[cf]))
        self.put_structured_out({"securityIssuesFound": ". ".join(issues)})
        self.put_structured_out({"securityState": "UNSECURED"})

    else:
      self.put_structured_out({"securityState": "UNSECURED"})

if __name__ == "__main__":
  HdfsClient().execute()
