def parse_unix_mode(self, mode_string):
"""
Return an integer from the `mode_string`, compatible with
the `st_mode` value in stat results. Such a mode string
may look like "drwxr-xr-x".
If the mode string can't be parsed, raise an
`ftp_error.ParserError`.
"""
st_mode = 0
if len(mode_string) != 10:
raise ftp_error.ParserError("invalid mode string '%s'" %
mode_string)
for bit in mode_string[1:10]:
bit = (bit != '-')
st_mode = (st_mode << 1) + bit
if mode_string[3] == 's':
st_mode = st_mode | stat.S_ISUID
if mode_string[6] == 's':
st_mode = st_mode | stat.S_ISGID
file_type_to_mode = {'d': stat.S_IFDIR, 'l': stat.S_IFLNK,
'c': stat.S_IFCHR, '-': stat.S_IFREG}
file_type = mode_string[0]
if file_type in file_type_to_mode:
st_mode = st_mode | file_type_to_mode[file_type]
else:
raise ftp_error.ParserError(
"unknown file type character '%s'" % file_type)
return st_mode
def parse_line(self, line, time_shift=0.0):
"""
Return a `StatResult` instance corresponding to the given
text line from a FTP server which emits "Microsoft format"
(see end of file).
If the line can't be parsed, raise a `ParserError`.
The parameter `time_shift` isn't used in this method but is
listed for compatibilty with the base class.
"""
try:
date, time_, dir_or_size, name = line.split(None, 3)
except ValueError:
# "unpack list of wrong size"
raise ftp_error.ParserError("line '%s' can't be parsed" % line)
# st_mode
# Default to read access only; in fact, we can't tell.
st_mode = 0400
if dir_or_size == "<DIR>":
st_mode = st_mode | stat.S_IFDIR
else:
st_mode = st_mode | stat.S_IFREG
# st_ino, st_dev, st_nlink, st_uid, st_gid
st_ino = None
st_dev = None
st_nlink = None
st_uid = None
st_gid = None
# st_size
if dir_or_size != "<DIR>":
try:
st_size = int(dir_or_size)
except ValueError:
raise ftp_error.ParserError("invalid size %s" % dir_or_size)
else:
st_size = None
# st_atime
st_atime = None
# st_mtime
st_mtime = self.parse_ms_time(date, time_, time_shift)
# st_ctime
st_ctime = None
stat_result = StatResult(
(st_mode, st_ino, st_dev, st_nlink, st_uid, st_gid, st_size,
st_atime, st_mtime, st_ctime))
# _st_name and _st_target
stat_result._st_name = name
stat_result._st_target = None
# mtime precision in seconds
stat_result._st_mtime_precision = 60
return stat_result
def _split_line(self, line):
"""
Split a line in metadata, nlink, user, group, size, month,
day, year_or_time and name and return the result as an
nine-element list of these values. If the name is a link,
it will be encoded as a string "link_name -> link_target".
"""
# This method encapsulates the recognition of an unusual
# Unix format variant (see ticket
# http://ftputil.sschwarzer.net/trac/ticket/12 ).
line_parts = line.split()
FIELD_COUNT_WITHOUT_USERID = 8
FIELD_COUNT_WITH_USERID = FIELD_COUNT_WITHOUT_USERID + 1
if len(line_parts) < FIELD_COUNT_WITHOUT_USERID:
# No known Unix-style format
raise ftp_error.ParserError("line '%s' can't be parsed" % line)
# If we have a valid format (either with or without user id field),
# the field with index 5 is either the month abbreviation or a day.
try:
int(line_parts[5])
except ValueError:
# Month abbreviation, "invalid literal for int"
line_parts = line.split(None, FIELD_COUNT_WITH_USERID - 1)
else:
# Day
line_parts = line.split(None, FIELD_COUNT_WITHOUT_USERID - 1)
USER_FIELD_INDEX = 2
line_parts.insert(USER_FIELD_INDEX, None)
return line_parts
def _split_line(self, line):
"""
Split a line in metadata, nlink, user, group, size, month,
day, year_or_time and name and return the result as an
nine-element list of these values.
"""
# This method encapsulates the recognition of an unusual
# Unix format variant (see ticket
# http://ftputil.sschwarzer.net/trac/ticket/12 )
parts = line.split(None, 8)
if len(parts) == 9:
if parts[-1].startswith("-> "):
# for the alternative format, the last part will not be
# "link_name -> link_target" but "-> link_target" and the
# link name will be in the previous field;
# this heuristic will fail for names starting with "-> "
# which should be _quite_ rare
# insert `None` for the user field
parts.insert(2, None)
parts[-2] = "%s %s" % tuple(parts[-2:])
del parts[-1]
return parts
elif len(parts) == 8:
# alternative unusual format, insert `None` for the user field
parts.insert(2, None)
return parts
else:
# no known Unix-style format
raise ftp_error.ParserError("line '%s' can't be parsed" % line)
def parse_ms_time(self, date, time_, time_shift):
"""
Return a floating point number, like from `time.mktime`, by
parsing the string arguments `date` and `time_`. The parameter
`time_shift` is the difference
"time on server" - "time on client"
and is available as the `time_shift` parameter in the
`parse_line` interface.
Times in MS-style directory listings typically have the
format "10-23-01 03:25PM" (month-day_of_month-two_digit_year,
hour:minute, am/pm).
If this method can not make sense of the given arguments, it
raises an `ftp_error.ParserError`.
"""
try:
month, day, year = map(int, date.split('-'))
if year >= 70:
year = 1900 + year
else:
year = 2000 + year
hour, minute, am_pm = time_[0:2], time_[3:5], time_[5]
hour, minute = int(hour), int(minute)
except (ValueError, IndexError):
raise ftp_error.ParserError("invalid time string '%s'" % time_)
if am_pm == 'P':
hour = hour + 12
st_mtime = time.mktime( (year, month, day,
hour, minute, 0, 0, 0, -1) )
return st_mtime
def parse_unix_mode(self, mode_string):
"""
Return an integer from the `mode_string`, compatible with
the `st_mode` value in stat results. Such a mode string
may look like "drwxr-xr-x".
If the mode string can't be parsed, raise an
`ftp_error.ParserError`.
"""
if len(mode_string) != 10:
raise ftp_error.ParserError("invalid mode string '%s'" %
mode_string)
st_mode = 0
#TODO Add support for "S" and sticky bit ("t", "T").
for bit in mode_string[1:10]:
bit = (bit != '-')
st_mode = (st_mode << 1) + bit
if mode_string[3] == 's':
st_mode = st_mode | stat.S_ISUID
if mode_string[6] == 's':
st_mode = st_mode | stat.S_ISGID
file_type_to_mode = {
'b': stat.S_IFBLK,
'c': stat.S_IFCHR,
'd': stat.S_IFDIR,
'l': stat.S_IFLNK,
'p': stat.S_IFIFO,
's': stat.S_IFSOCK,
'-': stat.S_IFREG,
# Ignore types which `ls` can't make sense of
# (assuming the FTP server returns listings
# like `ls` does).
'?': 0,
}
file_type = mode_string[0]
if file_type in file_type_to_mode:
st_mode = st_mode | file_type_to_mode[file_type]
else:
raise ftp_error.ParserError("unknown file type character '%s'" %
file_type)
return st_mode
def parse_unix_time(self, month_abbreviation, day, year_or_time,
time_shift):
"""
Return a floating point number, like from `time.mktime`, by
parsing the string arguments `month_abbreviation`, `day` and
`year_or_time`. The parameter `time_shift` is the difference
"time on server" - "time on client" and is available as the
`time_shift` parameter in the `parse_line` interface.
Times in Unix-style directory listings typically have one of
these formats:
- "Nov 23 02:33" (month name, day of month, time)
- "May 26 2005" (month name, day of month, year)
If this method can not make sense of the given arguments, it
raises an `ftp_error.ParserError`.
"""
try:
month = self._month_numbers[month_abbreviation.lower()]
except KeyError:
raise ftp_error.ParserError("invalid month name '%s'" % month)
day = int(day)
if ":" not in year_or_time:
# `year_or_time` is really a year
year, hour, minute = int(year_or_time), 0, 0
st_mtime = time.mktime( (year, month, day,
hour, minute, 0, 0, 0, -1) )
else:
# `year_or_time` is a time hh:mm
hour, minute = year_or_time.split(':')
year, hour, minute = None, int(hour), int(minute)
# try the current year
year = time.localtime()[0]
st_mtime = time.mktime( (year, month, day,
hour, minute, 0, 0, 0, -1) )
# rhs of comparison: transform client time to server time
# (as on the lhs), so both can be compared with respect
# to the set time shift (see the definition of the time
# shift in `FTPHost.set_time_shift`'s docstring); the
# last addend allows for small deviations between the
# supposed (rounded) and the actual time shift
# #XXX the downside of this "correction" is that there is
# a one-minute time interval exactly one year ago that
# may cause that datetime to be recognized as the current
# datetime, but after all the datetime from the server
# can only be exact up to a minute
if st_mtime > time.time() + time_shift + 60.0:
# if it's in the future, use previous year
st_mtime = time.mktime( (year-1, month, day,
hour, minute, 0, 0, 0, -1) )
return st_mtime
def parse_line(self, line, time_shift=0.0):
"""
Return a `StatResult` instance corresponding to the given
text line. The `time_shift` value is needed to determine
to which year a datetime without an explicit year belongs.
If the line can't be parsed, raise a `ParserError`.
"""
mode_string, nlink, user, group, size, month, day, \
year_or_time, name = self._split_line(line)
# st_mode
st_mode = self.parse_unix_mode(mode_string)
# st_ino, st_dev, st_nlink, st_uid, st_gid, st_size, st_atime
st_ino = None
st_dev = None
st_nlink = int(nlink)
st_uid = user
st_gid = group
st_size = int(size)
st_atime = None
# st_mtime
st_mtime, st_mtime_precision = \
self.parse_unix_time(month, day, year_or_time, time_shift,
with_precision=True)
# st_ctime
st_ctime = None
# st_name
if name.count(" -> ") > 1:
# If we have more than one arrow we can't tell where the link
# name ends and the target name starts.
raise ftp_error.ParserError(
'name "%s" contains more than one "->"' % name)
elif name.count(" -> ") == 1:
st_name, st_target = name.split(' -> ')
else:
st_name, st_target = name, None
stat_result = StatResult(
(st_mode, st_ino, st_dev, st_nlink, st_uid, st_gid, st_size,
st_atime, st_mtime, st_ctime))
stat_result._st_mtime_precision = st_mtime_precision
stat_result._st_name = st_name
stat_result._st_target = st_target
return stat_result
def parse_ms_time(self, date, time_, time_shift):
"""
Return a floating point number, like from `time.mktime`, by
parsing the string arguments `date` and `time_`. The parameter
`time_shift` is the difference
"time on server" - "time on client"
and can be set as the `time_shift` parameter in the
`parse_line` interface.
Times in MS-style directory listings typically have the
format "10-23-01 03:25PM" (month-day_of_month-two_digit_year,
hour:minute, am/pm).
If this method can not make sense of the given arguments, it
raises an `ftp_error.ParserError`.
"""
# Don't complain about unused `time_shift` argument
# pylint: disable=W0613
# For the time being, I don't add a `with_precision`
# parameter as in the Unix parser because the precision for
# the DOS format is always a minute and can be set in
# `MSParser.parse_line`. Should you find yourself needing
# support for `with_precision` for a derived class, please
# send a mail (see ftputil.txt/html).
try:
month, day, year = [int(part) for part in date.split('-')]
if year >= 70:
year = 1900 + year
else:
year = 2000 + year
hour, minute, am_pm = time_[0:2], time_[3:5], time_[5]
hour, minute = int(hour), int(minute)
except (ValueError, IndexError):
raise ftp_error.ParserError("invalid time string '%s'" % time_)
if hour == 12 and am_pm == 'A':
hour = 0
if hour != 12 and am_pm == 'P':
hour = hour + 12
st_mtime = time.mktime((year, month, day, hour, minute, 0, 0, 0, -1))
return st_mtime
def parse_unix_time(self,
month_abbreviation,
day,
year_or_time,
time_shift,
with_precision=False):
"""
Return a floating point number, like from `time.mktime`, by
parsing the string arguments `month_abbreviation`, `day` and
`year_or_time`. The parameter `time_shift` is the difference
"time on server" - "time on client" and is available as the
`time_shift` parameter in the `parse_line` interface.
If `with_precision` is true (default: false), return a
two-element tuple consisting of the floating point number as
described in the previous paragraph and the precision of the
time in seconds. This takes into account that, for example, a
time string like "May 26 2005" has only a precision of one
day. This information is important for the `upload_if_newer`
and `download_if_newer` methods in the `FTPHost` class.
Times in Unix-style directory listings typically have one of
these formats:
- "Nov 23 02:33" (month name, day of month, time)
- "May 26 2005" (month name, day of month, year)
If this method can not make sense of the given arguments, it
raises an `ftp_error.ParserError`.
"""
try:
month = self._month_numbers[month_abbreviation.lower()]
except KeyError:
raise ftp_error.ParserError("invalid month name '%s'" % month)
day = int(day)
if ":" not in year_or_time:
# `year_or_time` is really a year.
year, hour, minute = int(year_or_time), 0, 0
st_mtime = time.mktime(
(year, month, day, hour, minute, 0, 0, 0, -1))
# Precise up to a day.
st_mtime_precision = 24 * 60 * 60
else:
# `year_or_time` is a time hh:mm.
hour, minute = year_or_time.split(':')
year, hour, minute = None, int(hour), int(minute)
# Try the current year
year = time.localtime()[0]
st_mtime = time.mktime(
(year, month, day, hour, minute, 0, 0, 0, -1))
# Times are precise up to a minute.
st_mtime_precision = 60
# Rhs of comparison: Transform client time to server time
# (as on the lhs), so both can be compared with respect
# to the set time shift (see the definition of the time
# shift in `FTPHost.set_time_shift`'s docstring). The
# last addend allows for small deviations between the
# supposed (rounded) and the actual time shift.
# #XXX The downside of this "correction" is that there is
# a one-minute time interval exactly one year ago that
# may cause that datetime to be recognized as the current
# datetime, but after all the datetime from the server
# can only be exact up to a minute.
if st_mtime > time.time() + time_shift + st_mtime_precision:
# If it's in the future, use previous year.
st_mtime = time.mktime(
(year - 1, month, day, hour, minute, 0, 0, 0, -1))
if with_precision:
return (st_mtime, st_mtime_precision)
else:
return st_mtime
