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# -*- coding: utf-8 -*-
# Copyright 2014 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.
"""Utility functions and class for listing commands such as ls and du."""

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

import fnmatch
import sys

import six
from gslib.cloud_api import EncryptionException
from gslib.exception import CommandException
from gslib.plurality_checkable_iterator import PluralityCheckableIterator
from gslib.storage_url import GenerationFromUrlAndString
from gslib.utils.constants import S3_ACL_MARKER_GUID
from gslib.utils.constants import S3_DELETE_MARKER_GUID
from gslib.utils.constants import S3_MARKER_GUIDS
from gslib.utils.constants import UTF8
from gslib.utils.system_util import IS_WINDOWS
from gslib.utils.translation_helper import AclTranslation
from gslib.utils import text_util
from gslib.wildcard_iterator import StorageUrlFromString

ENCRYPTED_FIELDS = [
    'md5Hash',
    'crc32c',
]
UNENCRYPTED_FULL_LISTING_FIELDS = [
    'acl',
    'cacheControl',
    'componentCount',
    'contentDisposition',
    'contentEncoding',
    'contentLanguage',
    'contentType',
    'customTime',
    'kmsKeyName',
    'customerEncryption',
    'etag',
    'eventBasedHold',
    'generation',
    'metadata',
    'metageneration',
    'retentionExpirationTime',
    'size',
    'storageClass',
    'temporaryHold',
    'timeCreated',
    'timeDeleted',
    'timeStorageClassUpdated',
    'updated',
]


def MakeMetadataLine(label, value, indent=1):
  """Returns a string with a vertically aligned label and value.

  Labels of the same indentation level will start at the same column. Values
  will all start at the same column (unless the combined left-indent and
  label length is excessively long). If a value spans multiple lines,
  indentation will only be applied to the first line. Example output from
  several calls:

      Label1:            Value (default indent of 1 was used)
          Sublabel1:     Value (used indent of 2 here)
      Label2:            Value

  Args:
    label: The label to print in the first column.
    value: The value to print in the second column.
    indent: (4 * indent) spaces will be placed before the label.
  Returns:
    A string with a vertically aligned label and value.
  """
  return '{}{}'.format(((' ' * indent * 4) + label + ':').ljust(28), value)


def PrintBucketHeader(bucket_listing_ref):  # pylint: disable=unused-argument
  """Default function for printing headers for buckets.

  Header is printed prior to listing the contents of the bucket.

  Args:
    bucket_listing_ref: BucketListingRef of type BUCKET.
  """
  pass


def PrintDir(bucket_listing_ref):
  """Default function for printing buckets or prefixes.

  Args:
    bucket_listing_ref: BucketListingRef of type BUCKET or PREFIX.
  """
  text_util.print_to_fd(bucket_listing_ref.url_string)


# pylint: disable=unused-argument
def PrintDirSummary(num_bytes, bucket_listing_ref):
  """Off-by-default function for printing buckets or prefix size summaries.

  Args:
    num_bytes: Number of bytes contained in the directory.
    bucket_listing_ref: BucketListingRef of type BUCKET or PREFIX.
  """
  pass


def PrintDirHeader(bucket_listing_ref):
  """Default function for printing headers for prefixes.

  Header is printed prior to listing the contents of the prefix.

  Args:
    bucket_listing_ref: BucketListingRef of type PREFIX.
  """
  text_util.print_to_fd('{}:'.format(bucket_listing_ref.url_string))


def PrintNewLine():
  """Default function for printing new lines between directories."""
  text_util.print_to_fd()


# pylint: disable=too-many-statements
def PrintFullInfoAboutObject(bucket_listing_ref, incl_acl=True):
  """Print full info for given object (like what displays for gsutil ls -L).

  Args:
    bucket_listing_ref: BucketListingRef being listed.
                        Must have ref_type OBJECT and a populated root_object
                        with the desired fields.
    incl_acl: True if ACL info should be output.

  Returns:
    Tuple (number of objects, object_length)

  Raises:
    Exception: if calling bug encountered.
  """
  url_str = bucket_listing_ref.url_string
  storage_url = StorageUrlFromString(url_str)
  obj = bucket_listing_ref.root_object

  if (obj.metadata and
      S3_DELETE_MARKER_GUID in obj.metadata.additionalProperties):
    num_bytes = 0
    num_objs = 0
    url_str += '<DeleteMarker>'
  else:
    num_bytes = obj.size
    num_objs = 1

  text_util.print_to_fd('{}:'.format(url_str))
  if obj.timeCreated:
    text_util.print_to_fd(
        MakeMetadataLine('Creation time',
                         obj.timeCreated.strftime('%a, %d %b %Y %H:%M:%S GMT')))
  if obj.updated:
    text_util.print_to_fd(
        MakeMetadataLine('Update time',
                         obj.updated.strftime('%a, %d %b %Y %H:%M:%S GMT')))
  if (obj.timeStorageClassUpdated and
      obj.timeStorageClassUpdated != obj.timeCreated):
    text_util.print_to_fd(
        MakeMetadataLine(
            'Storage class update time',
            obj.timeStorageClassUpdated.strftime('%a, %d %b %Y %H:%M:%S GMT')))
  if obj.storageClass:
    text_util.print_to_fd(MakeMetadataLine('Storage class', obj.storageClass))
  if obj.temporaryHold:
    text_util.print_to_fd(MakeMetadataLine('Temporary Hold', 'Enabled'))
  if obj.eventBasedHold:
    text_util.print_to_fd(MakeMetadataLine('Event-Based Hold', 'Enabled'))
  if obj.retentionExpirationTime:
    text_util.print_to_fd(
        MakeMetadataLine(
            'Retention Expiration',
            obj.retentionExpirationTime.strftime('%a, %d %b %Y %H:%M:%S GMT')))
  if obj.kmsKeyName:
    text_util.print_to_fd(MakeMetadataLine('KMS key', obj.kmsKeyName))
  if obj.cacheControl:
    text_util.print_to_fd(MakeMetadataLine('Cache-Control', obj.cacheControl))
  if obj.contentDisposition:
    text_util.print_to_fd(
        MakeMetadataLine('Content-Disposition', obj.contentDisposition))
  if obj.contentEncoding:
    text_util.print_to_fd(
        MakeMetadataLine('Content-Encoding', obj.contentEncoding))
  if obj.contentLanguage:
    text_util.print_to_fd(
        MakeMetadataLine('Content-Language', obj.contentLanguage))
  text_util.print_to_fd(MakeMetadataLine('Content-Length', obj.size))
  text_util.print_to_fd(MakeMetadataLine('Content-Type', obj.contentType))
  if obj.componentCount:
    text_util.print_to_fd(
        MakeMetadataLine('Component-Count', obj.componentCount))
  if obj.customTime:
    text_util.print_to_fd(MakeMetadataLine('Custom-Time', obj.customTime))
  if obj.timeDeleted:
    text_util.print_to_fd(
        MakeMetadataLine('Noncurrent time',
                         obj.timeDeleted.strftime('%a, %d %b %Y %H:%M:%S GMT')))
  marker_props = {}
  if obj.metadata and obj.metadata.additionalProperties:
    non_marker_props = []
    for add_prop in obj.metadata.additionalProperties:
      if add_prop.key not in S3_MARKER_GUIDS:
        non_marker_props.append(add_prop)
      else:
        marker_props[add_prop.key] = add_prop.value
    if non_marker_props:
      text_util.print_to_fd(MakeMetadataLine('Metadata', ''))
      for ap in non_marker_props:
        ap_key = '{}'.format(ap.key)
        ap_value = '{}'.format(ap.value)
        meta_data_line = MakeMetadataLine(ap_key, ap_value, indent=2)
        text_util.print_to_fd(meta_data_line)
  if obj.customerEncryption:
    if not obj.crc32c:
      text_util.print_to_fd(MakeMetadataLine('Hash (crc32c)', 'encrypted'))
    if not obj.md5Hash:
      text_util.print_to_fd(MakeMetadataLine('Hash (md5)', 'encrypted'))
    text_util.print_to_fd(
        MakeMetadataLine('Encryption algorithm',
                         obj.customerEncryption.encryptionAlgorithm))
    text_util.print_to_fd(
        MakeMetadataLine('Encryption key SHA256',
                         obj.customerEncryption.keySha256))
  if obj.crc32c:
    text_util.print_to_fd(MakeMetadataLine('Hash (crc32c)', obj.crc32c))
  if obj.md5Hash:
    text_util.print_to_fd(MakeMetadataLine('Hash (md5)', obj.md5Hash))
  text_util.print_to_fd(MakeMetadataLine('ETag', obj.etag.strip('"\'')))
  if obj.generation:
    generation_str = GenerationFromUrlAndString(storage_url, obj.generation)
    text_util.print_to_fd(MakeMetadataLine('Generation', generation_str))
  if obj.metageneration:
    text_util.print_to_fd(MakeMetadataLine('Metageneration',
                                           obj.metageneration))
  if incl_acl:
    # JSON API won't return acls as part of the response unless we have
    # full control scope
    if obj.acl:
      text_util.print_to_fd(
          MakeMetadataLine('ACL', AclTranslation.JsonFromMessage(obj.acl)))
    elif S3_ACL_MARKER_GUID in marker_props:
      text_util.print_to_fd(
          MakeMetadataLine('ACL', marker_props[S3_ACL_MARKER_GUID]))
    else:
      # Empty ACLs are possible with Bucket Policy Only and no longer imply
      # ACCESS DENIED anymore.
      text_util.print_to_fd(MakeMetadataLine('ACL', '[]'))

  return (num_objs, num_bytes)


def PrintObject(bucket_listing_ref):
  """Default printing function for objects.

  Args:
    bucket_listing_ref: BucketListingRef of type OBJECT.

  Returns:
    (num_objects, num_bytes).
  """
  try:
    text_util.print_to_fd(bucket_listing_ref.url_string)
  except IOError as e:
    # Windows throws an IOError 0 here for object names containing Unicode
    # chars. Ignore it.
    if not (IS_WINDOWS and e.errno == 0):
      raise
  return (1, 0)


class LsHelper(object):
  """Helper class for ls and du."""

  def __init__(self,
               iterator_func,
               logger,
               print_object_func=PrintObject,
               print_dir_func=PrintDir,
               print_dir_header_func=PrintDirHeader,
               print_bucket_header_func=PrintBucketHeader,
               print_dir_summary_func=PrintDirSummary,
               print_newline_func=PrintNewLine,
               all_versions=False,
               should_recurse=False,
               exclude_patterns=None,
               fields=('name',),
               list_subdir_contents=True):
    """Initializes the helper class to prepare for listing.

    Args:
      iterator_func: Function for instantiating iterator.
                     Inputs-
                       url_string- Url string to iterate on. May include
                                   wildcards.
                       all_versions=False- If true, iterate over all object
                                           versions.
      logger: Logger for outputting warnings / errors.
      print_object_func: Function for printing objects.
      print_dir_func:    Function for printing buckets/prefixes.
      print_dir_header_func: Function for printing header line for buckets
                             or prefixes.
      print_bucket_header_func: Function for printing header line for buckets
                                or prefixes.
      print_dir_summary_func: Function for printing size summaries about
                              buckets/prefixes.
      print_newline_func: Function for printing new lines between dirs.
      all_versions:      If true, list all object versions.
      should_recurse:    If true, recursively listing buckets/prefixes.
      exclude_patterns:  Patterns to exclude when listing.
      fields:            Fields to request from bucket listings; this should
                         include all fields that need to be populated in
                         objects so they can be listed. Can be set to None
                         to retrieve all object fields. Defaults to short
                         listing fields.
      list_subdir_contents: If true, return the directory and any contents,
                            otherwise return only the directory itself.
    """
    self._iterator_func = iterator_func
    self.logger = logger
    self._print_object_func = print_object_func
    self._print_dir_func = print_dir_func
    self._print_dir_header_func = print_dir_header_func
    self._print_bucket_header_func = print_bucket_header_func
    self._print_dir_summary_func = print_dir_summary_func
    self._print_newline_func = print_newline_func
    self.all_versions = all_versions
    self.should_recurse = should_recurse
    self.exclude_patterns = exclude_patterns
    self.bucket_listing_fields = fields
    self.list_subdir_contents = list_subdir_contents

  def ExpandUrlAndPrint(self, url):
    """Iterates over the given URL and calls print functions.

    Args:
      url: StorageUrl to iterate over.

    Returns:
      (num_objects, num_bytes) total number of objects and bytes iterated.
    """
    num_objects = 0
    num_dirs = 0
    num_bytes = 0
    print_newline = False

    if url.IsBucket() or self.should_recurse:
      # IsBucket() implies a top-level listing.
      if url.IsBucket():
        self._print_bucket_header_func(url)
      return self._RecurseExpandUrlAndPrint(url.url_string,
                                            print_initial_newline=False)
    else:
      # User provided a prefix or object URL, but can't tell which unless there
      # is a generation or we do a listing to see what matches.
      if url.HasGeneration():
        iteration_url = url.url_string
      else:
        iteration_url = url.CreatePrefixUrl()
      top_level_iterator = PluralityCheckableIterator(
          self._iterator_func(
              iteration_url, all_versions=self.all_versions).IterAll(
                  expand_top_level_buckets=True,
                  bucket_listing_fields=self.bucket_listing_fields))
      plurality = top_level_iterator.HasPlurality()

      try:
        top_level_iterator.PeekException()
      except EncryptionException:
        # Detailed listing on a single object can perform a GetObjectMetadata
        # call, which raises if a matching encryption key isn't found.
        # Re-iterate without requesting encrypted fields.
        top_level_iterator = PluralityCheckableIterator(
            self._iterator_func(
                url.CreatePrefixUrl(wildcard_suffix=None),
                all_versions=self.all_versions).IterAll(
                    expand_top_level_buckets=True,
                    bucket_listing_fields=UNENCRYPTED_FULL_LISTING_FIELDS))
        plurality = top_level_iterator.HasPlurality()

      for blr in top_level_iterator:
        if self._MatchesExcludedPattern(blr):
          continue
        if blr.IsObject():
          nd = 0
          no, nb = self._print_object_func(blr)
          print_newline = True
        elif blr.IsPrefix():
          if print_newline:
            self._print_newline_func()
          else:
            print_newline = True
          if plurality and self.list_subdir_contents:
            self._print_dir_header_func(blr)
          elif plurality and not self.list_subdir_contents:
            print_newline = False
          expansion_url_str = StorageUrlFromString(
              blr.url_string).CreatePrefixUrl(
                  wildcard_suffix='*' if self.list_subdir_contents else None)
          nd, no, nb = self._RecurseExpandUrlAndPrint(expansion_url_str)
          self._print_dir_summary_func(nb, blr)
        else:
          # We handle all buckets at the top level, so this should never happen.
          raise CommandException(
              'Sub-level iterator returned a CsBucketListingRef of type Bucket')
        num_objects += no
        num_dirs += nd
        num_bytes += nb
      return num_dirs, num_objects, num_bytes

  def _RecurseExpandUrlAndPrint(self, url_str, print_initial_newline=True):
    """Iterates over the given URL string and calls print functions.

    Args:
      url_str: String describing StorageUrl to iterate over.
               Must be of depth one or higher.
      print_initial_newline: If true, print a newline before recursively
                             expanded prefixes.

    Returns:
      (num_objects, num_bytes) total number of objects and bytes iterated.
    """
    num_objects = 0
    num_dirs = 0
    num_bytes = 0
    for blr in self._iterator_func(
        '%s' % url_str, all_versions=self.all_versions).IterAll(
            expand_top_level_buckets=True,
            bucket_listing_fields=self.bucket_listing_fields):
      if self._MatchesExcludedPattern(blr):
        continue

      if blr.IsObject():
        nd = 0
        no, nb = self._print_object_func(blr)
      elif blr.IsPrefix():
        if self.should_recurse:
          if print_initial_newline:
            self._print_newline_func()
          else:
            print_initial_newline = True
          self._print_dir_header_func(blr)
          expansion_url_str = StorageUrlFromString(
              blr.url_string).CreatePrefixUrl(wildcard_suffix='*')

          nd, no, nb = self._RecurseExpandUrlAndPrint(expansion_url_str)
          self._print_dir_summary_func(nb, blr)
        else:
          nd, no, nb = 1, 0, 0
          self._print_dir_func(blr)
      else:
        # We handle all buckets at the top level, so this should never happen.
        raise CommandException(
            'Sub-level iterator returned a bucketListingRef of type Bucket')
      num_dirs += nd
      num_objects += no
      num_bytes += nb

    return num_dirs, num_objects, num_bytes

  def _MatchesExcludedPattern(self, blr):
    """Checks bucket listing reference against patterns to exclude.

    Args:
      blr: BucketListingRef to check.

    Returns:
      True if reference matches a pattern and should be excluded.
    """
    if self.exclude_patterns:
      tomatch = six.ensure_str(blr.url_string)
      for pattern in self.exclude_patterns:
        if fnmatch.fnmatch(tomatch, six.ensure_str(pattern)):
          return True
    return False

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