"""Certbot display."""
import logging
import os
import select
import sys
import textwrap
import zope.interface
from certbot import constants
from certbot import interfaces
from certbot import errors
from certbot.display import completer
logger = logging.getLogger(__name__)
WIDTH = 72
# Display exit codes
OK = "ok"
"""Display exit code indicating user acceptance."""
CANCEL = "cancel"
"""Display exit code for a user canceling the display."""
HELP = "help"
"""Display exit code when for when the user requests more help."""
ESC = "esc"
"""Display exit code when the user hits Escape"""
[docs]def _wrap_lines(msg):
"""Format lines nicely to 80 chars.
:param str msg: Original message
:returns: Formatted message respecting newlines in message
:rtype: str
"""
lines = msg.splitlines()
fixed_l = []
for line in lines:
fixed_l.append(textwrap.fill(
line,
80,
break_long_words=False,
break_on_hyphens=False))
return os.linesep.join(fixed_l)
@zope.interface.implementer(interfaces.IDisplay)
[docs]class FileDisplay(object):
"""File-based display."""
# pylint: disable=too-many-arguments
# see https://github.com/certbot/certbot/issues/3915
def __init__(self, outfile, force_interactive):
super(FileDisplay, self).__init__()
self.outfile = outfile
self.force_interactive = force_interactive
self.skipped_interaction = False
[docs] def notification(self, message, pause=True,
wrap=True, force_interactive=False):
"""Displays a notification and waits for user acceptance.
:param str message: Message to display
:param bool pause: Whether or not the program should pause for the
user's confirmation
:param bool wrap: Whether or not the application should wrap text
:param bool force_interactive: True if it's safe to prompt the user
because it won't cause any workflow regressions
"""
side_frame = "-" * 79
if wrap:
message = _wrap_lines(message)
self.outfile.write(
"{line}{frame}{line}{msg}{line}{frame}{line}".format(
line=os.linesep, frame=side_frame, msg=message))
if pause:
if self._can_interact(force_interactive):
input_with_timeout("Press Enter to Continue")
else:
logger.debug("Not pausing for user confirmation")
[docs] def yesno(self, message, yes_label="Yes", no_label="No", default=None,
cli_flag=None, force_interactive=False, **unused_kwargs):
"""Query the user with a yes/no question.
Yes and No label must begin with different letters, and must contain at
least one letter each.
:param str message: question for the user
:param str yes_label: Label of the "Yes" parameter
:param str no_label: Label of the "No" parameter
:param default: default value to return (if one exists)
:param str cli_flag: option used to set this value with the CLI
:param bool force_interactive: True if it's safe to prompt the user
because it won't cause any workflow regressions
:returns: True for "Yes", False for "No"
:rtype: bool
"""
if self._return_default(message, default, cli_flag, force_interactive):
return default
side_frame = ("-" * 79) + os.linesep
message = _wrap_lines(message)
self.outfile.write("{0}{frame}{msg}{0}{frame}".format(
os.linesep, frame=side_frame, msg=message))
while True:
ans = input_with_timeout("{yes}/{no}: ".format(
yes=_parens_around_char(yes_label),
no=_parens_around_char(no_label)))
# Couldn't get pylint indentation right with elif
# elif doesn't matter in this situation
if (ans.startswith(yes_label[0].lower()) or
ans.startswith(yes_label[0].upper())):
return True
if (ans.startswith(no_label[0].lower()) or
ans.startswith(no_label[0].upper())):
return False
[docs] def checklist(self, message, tags, default_status=True, default=None,
cli_flag=None, force_interactive=False, **unused_kwargs):
# pylint: disable=unused-argument
"""Display a checklist.
:param str message: Message to display to user
:param list tags: `str` tags to select, len(tags) > 0
:param bool default_status: Not used for FileDisplay
:param default: default value to return (if one exists)
:param str cli_flag: option used to set this value with the CLI
:param bool force_interactive: True if it's safe to prompt the user
because it won't cause any workflow regressions
:returns: tuple of (`code`, `tags`) where
`code` - str display exit code
`tags` - list of selected tags
:rtype: tuple
"""
if self._return_default(message, default, cli_flag, force_interactive):
return OK, default
while True:
self._print_menu(message, tags)
code, ans = self.input("Select the appropriate numbers separated "
"by commas and/or spaces, or leave input "
"blank to select all options shown",
force_interactive=True)
if code == OK:
if len(ans.strip()) == 0:
ans = " ".join(str(x) for x in range(1, len(tags)+1))
indices = separate_list_input(ans)
selected_tags = self._scrub_checklist_input(indices, tags)
if selected_tags:
return code, selected_tags
else:
self.outfile.write(
"** Error - Invalid selection **%s" % os.linesep)
else:
return code, []
[docs] def _return_default(self, prompt, default, cli_flag, force_interactive):
"""Should we return the default instead of prompting the user?
:param str prompt: prompt for the user
:param default: default answer to prompt
:param str cli_flag: command line option for setting an answer
to this question
:param bool force_interactive: if interactivity is forced by the
IDisplay call
:returns: True if we should return the default without prompting
:rtype: bool
"""
# assert_valid_call(prompt, default, cli_flag, force_interactive)
if self._can_interact(force_interactive):
return False
elif default is None:
msg = "Unable to get an answer for the question:\n{0}".format(prompt)
if cli_flag:
msg += (
"\nYou can provide an answer on the "
"command line with the {0} flag.".format(cli_flag))
raise errors.Error(msg)
else:
logger.debug(
"Falling back to default %s for the prompt:\n%s",
default, prompt)
return True
[docs] def _can_interact(self, force_interactive):
"""Can we safely interact with the user?
:param bool force_interactive: if interactivity is forced by the
IDisplay call
:returns: True if the display can interact with the user
:rtype: bool
"""
if (self.force_interactive or force_interactive or
sys.stdin.isatty() and self.outfile.isatty()):
return True
elif not self.skipped_interaction:
logger.warning(
"Skipped user interaction because Certbot doesn't appear to "
"be running in a terminal. You should probably include "
"--non-interactive or %s on the command line.",
constants.FORCE_INTERACTIVE_FLAG)
self.skipped_interaction = True
return False
[docs] def directory_select(self, message, default=None, cli_flag=None,
force_interactive=False, **unused_kwargs):
"""Display a directory selection screen.
:param str message: prompt to give the user
:param default: default value to return (if one exists)
:param str cli_flag: option used to set this value with the CLI
:param bool force_interactive: True if it's safe to prompt the user
because it won't cause any workflow regressions
:returns: tuple of the form (`code`, `string`) where
`code` - display exit code
`string` - input entered by the user
"""
with completer.Completer():
return self.input(message, default, cli_flag, force_interactive)
[docs] def _get_valid_int_ans(self, max_):
"""Get a numerical selection.
:param int max: The maximum entry (len of choices), must be positive
:returns: tuple of the form (`code`, `selection`) where
`code` - str display exit code ('ok' or cancel')
`selection` - int user's selection
:rtype: tuple
"""
selection = -1
if max_ > 1:
input_msg = ("Select the appropriate number "
"[1-{max_}] then [enter] (press 'c' to "
"cancel): ".format(max_=max_))
else:
input_msg = ("Press 1 [enter] to confirm the selection "
"(press 'c' to cancel): ")
while selection < 1:
ans = input_with_timeout(input_msg)
if ans.startswith("c") or ans.startswith("C"):
return CANCEL, -1
try:
selection = int(ans)
if selection < 1 or selection > max_:
selection = -1
raise ValueError
except ValueError:
self.outfile.write(
"{0}** Invalid input **{0}".format(os.linesep))
return OK, selection
[docs]def assert_valid_call(prompt, default, cli_flag, force_interactive):
"""Verify that provided arguments is a valid IDisplay call.
:param str prompt: prompt for the user
:param default: default answer to prompt
:param str cli_flag: command line option for setting an answer
to this question
:param bool force_interactive: if interactivity is forced by the
IDisplay call
"""
msg = "Invalid IDisplay call for this prompt:\n{0}".format(prompt)
if cli_flag:
msg += ("\nYou can set an answer to "
"this prompt with the {0} flag".format(cli_flag))
assert default is not None or force_interactive, msg
@zope.interface.implementer(interfaces.IDisplay)
[docs]class NoninteractiveDisplay(object):
"""An iDisplay implementation that never asks for interactive user input"""
def __init__(self, outfile, *unused_args, **unused_kwargs):
super(NoninteractiveDisplay, self).__init__()
self.outfile = outfile
[docs] def _interaction_fail(self, message, cli_flag, extra=""):
"Error out in case of an attempt to interact in noninteractive mode"
msg = "Missing command line flag or config entry for this setting:\n"
msg += message
if extra:
msg += "\n" + extra
if cli_flag:
msg += "\n\n(You can set this with the {0} flag)".format(cli_flag)
raise errors.MissingCommandlineFlag(msg)
[docs] def notification(self, message, pause=False, wrap=True, **unused_kwargs):
# pylint: disable=unused-argument
"""Displays a notification without waiting for user acceptance.
:param str message: Message to display to stdout
:param bool pause: The NoninteractiveDisplay waits for no keyboard
:param bool wrap: Whether or not the application should wrap text
"""
side_frame = "-" * 79
if wrap:
message = _wrap_lines(message)
self.outfile.write(
"{line}{frame}{line}{msg}{line}{frame}{line}".format(
line=os.linesep, frame=side_frame, msg=message))
[docs] def yesno(self, message, yes_label=None, no_label=None,
default=None, cli_flag=None, **unused_kwargs):
# pylint: disable=unused-argument
"""Decide Yes or No, without asking anybody
:param str message: question for the user
:param dict kwargs: absorbs yes_label, no_label
:raises errors.MissingCommandlineFlag: if there was no default
:returns: True for "Yes", False for "No"
:rtype: bool
"""
if default is None:
self._interaction_fail(message, cli_flag)
else:
return default
[docs] def checklist(self, message, tags, default=None,
cli_flag=None, **unused_kwargs):
"""Display a checklist.
:param str message: Message to display to user
:param list tags: `str` tags to select, len(tags) > 0
:param dict kwargs: absorbs default_status arg
:returns: tuple of (`code`, `tags`) where
`code` - str display exit code
`tags` - list of selected tags
:rtype: tuple
"""
if default is None:
self._interaction_fail(message, cli_flag, "? ".join(tags))
else:
return OK, default
[docs] def directory_select(self, message, default=None,
cli_flag=None, **unused_kwargs):
"""Simulate prompting the user for a directory.
This function returns default if it is not ``None``, otherwise,
an exception is raised explaining the problem. If cli_flag is
not ``None``, the error message will include the flag that can
be used to set this value with the CLI.
:param str message: prompt to give the user
:param default: default value to return (if one exists)
:param str cli_flag: option used to set this value with the CLI
:returns: tuple of the form (`code`, `string`) where
`code` - int display exit code
`string` - input entered by the user
"""
return self.input(message, default, cli_flag)
[docs]def _parens_around_char(label):
"""Place parens around first character of label.
:param str label: Must contain at least one character
"""
return "({first}){rest}".format(first=label[0], rest=label[1:])