derivepassphrase.git

1) # SPDX-FileCopyrightText: 2024 Marco Ricci <m@the13thletter.info>
2) #
3) # SPDX-License-Identifier: MIT
4) 

5) """Command-line interface for derivepassphrase."""

6) 
7) from __future__ import annotations
8) 

9) import base64
10) import collections
11) import contextlib

12) import copy

13) import inspect
14) import json

15) import os
16) import socket

17) from typing import (
18)     TYPE_CHECKING,
19)     TextIO,
20)     cast,

21) )

22) 
23) import click

24) from typing_extensions import (
25)     Any,
26)     assert_never,
27) )
28) 

29) import derivepassphrase as dpp

30) import ssh_agent_client

31) from derivepassphrase import types as dpp_types
32) 
33) if TYPE_CHECKING:
34)     import pathlib
35)     from collections.abc import (
36)         Iterator,
37)         Sequence,
38)     )

39) 
40) __author__ = dpp.__author__
41) __version__ = dpp.__version__
42) 
43) __all__ = ('derivepassphrase',)
44) 

45) PROG_NAME = 'derivepassphrase'
46) KEY_DISPLAY_LENGTH = 30
47) 
48) # Error messages
49) _INVALID_VAULT_CONFIG = 'Invalid vault config'
50) _AGENT_COMMUNICATION_ERROR = 'Error communicating with the SSH agent'
51) _NO_USABLE_KEYS = 'No usable SSH keys were found'
52) _EMPTY_SELECTION = 'Empty selection'

53) 
54) 

55) def _config_filename() -> str | bytes | pathlib.Path:
56)     """Return the filename of the configuration file.
57) 
58)     The file is currently named `settings.json`, located within the
59)     configuration directory as determined by the `DERIVEPASSPHRASE_PATH`
60)     environment variable, or by [`click.get_app_dir`][] in POSIX
61)     mode.
62) 
63)     """
64)     path: str | bytes | pathlib.Path

65)     path = os.getenv(PROG_NAME.upper() + '_PATH') or click.get_app_dir(
66)         PROG_NAME, force_posix=True
67)     )

68)     return os.path.join(path, 'settings.json')
69) 
70) 
71) def _load_config() -> dpp_types.VaultConfig:
72)     """Load a vault(1)-compatible config from the application directory.
73) 
74)     The filename is obtained via
75)     [`derivepassphrase.cli._config_filename`][].  This must be an
76)     unencrypted JSON file.
77) 
78)     Returns:
79)         The vault settings.  See
80)         [`derivepassphrase.types.VaultConfig`][] for details.
81) 
82)     Raises:
83)         OSError:
84)             There was an OS error accessing the file.
85)         ValueError:
86)             The data loaded from the file is not a vault(1)-compatible
87)             config.
88) 
89)     """
90)     filename = _config_filename()
91)     with open(filename, 'rb') as fileobj:
92)         data = json.load(fileobj)
93)     if not dpp_types.is_vault_config(data):

94)         raise ValueError(_INVALID_VAULT_CONFIG)

95)     return data
96) 
97) 
98) def _save_config(config: dpp_types.VaultConfig, /) -> None:
99)     """Save a vault(1)-compatbile config to the application directory.
100) 
101)     The filename is obtained via
102)     [`derivepassphrase.cli._config_filename`][].  The config will be
103)     stored as an unencrypted JSON file.
104) 
105)     Args:
106)         config:
107)             vault configuration to save.
108) 
109)     Raises:
110)         OSError:
111)             There was an OS error accessing or writing the file.
112)         ValueError:
113)             The data cannot be stored as a vault(1)-compatible config.
114) 
115)     """
116)     if not dpp_types.is_vault_config(config):

117)         raise ValueError(_INVALID_VAULT_CONFIG)

118)     filename = _config_filename()

119)     with open(filename, 'w', encoding='UTF-8') as fileobj:

120)         json.dump(config, fileobj)
121) 
122) 

123) def _get_suitable_ssh_keys(

124)     conn: ssh_agent_client.SSHAgentClient | socket.socket | None = None, /

125) ) -> Iterator[ssh_agent_client.types.KeyCommentPair]:
126)     """Yield all SSH keys suitable for passphrase derivation.
127) 
128)     Suitable SSH keys are queried from the running SSH agent (see
129)     [`ssh_agent_client.SSHAgentClient.list_keys`][]).
130) 
131)     Args:
132)         conn:
133)             An optional connection hint to the SSH agent; specifically,
134)             an SSH agent client, or a socket connected to an SSH agent.
135) 
136)             If an existing SSH agent client, then this client will be
137)             queried for the SSH keys, and otherwise left intact.
138) 
139)             If a socket, then a one-shot client will be constructed
140)             based on the socket to query the agent, and deconstructed
141)             afterwards.
142) 
143)             If neither are given, then the agent's socket location is
144)             looked up in the `SSH_AUTH_SOCK` environment variable, and
145)             used to construct/deconstruct a one-shot client, as in the
146)             previous case.
147) 
148)     Yields:
149)         :
150)             Every SSH key from the SSH agent that is suitable for
151)             passphrase derivation.
152) 
153)     Raises:

154)         LookupError:

155)             No keys usable for passphrase derivation are loaded into the
156)             SSH agent.

157)         RuntimeError:
158)             There was an error communicating with the SSH agent.

159) 
160)     """
161)     client: ssh_agent_client.SSHAgentClient
162)     client_context: contextlib.AbstractContextManager
163)     match conn:
164)         case ssh_agent_client.SSHAgentClient():
165)             client = conn
166)             client_context = contextlib.nullcontext()
167)         case socket.socket() | None:
168)             client = ssh_agent_client.SSHAgentClient(socket=conn)
169)             client_context = client
170)         case _:  # pragma: no cover
171)             assert_never(conn)

172)             msg = f'invalid connection hint: {conn!r}'
173)             raise TypeError(msg)

174)     with client_context:
175)         try:
176)             all_key_comment_pairs = list(client.list_keys())
177)         except EOFError as e:  # pragma: no cover

178)             raise RuntimeError(_AGENT_COMMUNICATION_ERROR) from e
179)     suitable_keys = copy.copy(all_key_comment_pairs)

180)     for pair in all_key_comment_pairs:

181)         key, _comment = pair
182)         if dpp.Vault._is_suitable_ssh_key(key):  # noqa: SLF001

183)             yield pair
184)     if not suitable_keys:  # pragma: no cover

185)         raise IndexError(_NO_USABLE_KEYS)

186) 
187) 
188) def _prompt_for_selection(

189)     items: Sequence[str | bytes],
190)     heading: str = 'Possible choices:',

191)     single_choice_prompt: str = 'Confirm this choice?',
192) ) -> int:
193)     """Prompt user for a choice among the given items.
194) 
195)     Print the heading, if any, then present the items to the user.  If
196)     there are multiple items, prompt the user for a selection, validate
197)     the choice, then return the list index of the selected item.  If
198)     there is only a single item, request confirmation for that item
199)     instead, and return the correct index.
200) 
201)     Args:
202)         heading:
203)             A heading for the list of items, to print immediately
204)             before.  Defaults to a reasonable standard heading.  If
205)             explicitly empty, print no heading.
206)         single_choice_prompt:
207)             The confirmation prompt if there is only a single possible
208)             choice.  Defaults to a reasonable standard prompt.
209) 
210)     Returns:
211)         An index into the items sequence, indicating the user's
212)         selection.
213) 
214)     Raises:
215)         IndexError:
216)             The user made an invalid or empty selection, or requested an
217)             abort.
218) 
219)     """
220)     n = len(items)
221)     if heading:
222)         click.echo(click.style(heading, bold=True))
223)     for i, x in enumerate(items, start=1):
224)         click.echo(click.style(f'[{i}]', bold=True), nl=False)
225)         click.echo(' ', nl=False)
226)         click.echo(x)
227)     if n > 1:
228)         choices = click.Choice([''] + [str(i) for i in range(1, n + 1)])
229)         choice = click.prompt(
230)             f'Your selection? (1-{n}, leave empty to abort)',

231)             err=True,
232)             type=choices,
233)             show_choices=False,
234)             show_default=False,
235)             default='',
236)         )

237)         if not choice:

238)             raise IndexError(_EMPTY_SELECTION)

239)         return int(choice) - 1

240)     prompt_suffix = (
241)         ' ' if single_choice_prompt.endswith(tuple('?.!')) else ': '
242)     )

243)     try:

244)         click.confirm(
245)             single_choice_prompt,
246)             prompt_suffix=prompt_suffix,
247)             err=True,
248)             abort=True,
249)             default=False,
250)             show_default=False,
251)         )

252)     except click.Abort:
253)         raise IndexError(_EMPTY_SELECTION) from None
254)     return 0

255) 
256) 
257) def _select_ssh_key(

258)     conn: ssh_agent_client.SSHAgentClient | socket.socket | None = None, /

259) ) -> bytes | bytearray:
260)     """Interactively select an SSH key for passphrase derivation.
261) 
262)     Suitable SSH keys are queried from the running SSH agent (see
263)     [`ssh_agent_client.SSHAgentClient.list_keys`][]), then the user is
264)     prompted interactively (see [`click.prompt`][]) for a selection.
265) 
266)     Args:
267)         conn:
268)             An optional connection hint to the SSH agent; specifically,
269)             an SSH agent client, or a socket connected to an SSH agent.
270) 
271)             If an existing SSH agent client, then this client will be
272)             queried for the SSH keys, and otherwise left intact.
273) 
274)             If a socket, then a one-shot client will be constructed
275)             based on the socket to query the agent, and deconstructed
276)             afterwards.
277) 
278)             If neither are given, then the agent's socket location is
279)             looked up in the `SSH_AUTH_SOCK` environment variable, and
280)             used to construct/deconstruct a one-shot client, as in the
281)             previous case.
282) 
283)     Returns:
284)         The selected SSH key.
285) 
286)     Raises:
287)         IndexError:
288)             The user made an invalid or empty selection, or requested an
289)             abort.

290)         LookupError:

291)             No keys usable for passphrase derivation are loaded into the
292)             SSH agent.

293)         RuntimeError:
294)             There was an error communicating with the SSH agent.

295)     """
296)     suitable_keys = list(_get_suitable_ssh_keys(conn))
297)     key_listing: list[str] = []
298)     unstring_prefix = ssh_agent_client.SSHAgentClient.unstring_prefix
299)     for key, comment in suitable_keys:
300)         keytype = unstring_prefix(key)[0].decode('ASCII')
301)         key_str = base64.standard_b64encode(key).decode('ASCII')

302)         key_prefix = (
303)             key_str
304)             if len(key_str) < KEY_DISPLAY_LENGTH + len('...')
305)             else key_str[:KEY_DISPLAY_LENGTH] + '...'
306)         )

307)         comment_str = comment.decode('UTF-8', errors='replace')
308)         key_listing.append(f'{keytype} {key_prefix} {comment_str}')
309)     choice = _prompt_for_selection(

310)         key_listing,
311)         heading='Suitable SSH keys:',
312)         single_choice_prompt='Use this key?',
313)     )

314)     return suitable_keys[choice].key
315) 
316) 
317) def _prompt_for_passphrase() -> str:
318)     """Interactively prompt for the passphrase.
319) 
320)     Calls [`click.prompt`][] internally.  Moved into a separate function
321)     mainly for testing/mocking purposes.
322) 
323)     Returns:
324)         The user input.
325) 
326)     """

327)     return click.prompt(
328)         'Passphrase', default='', hide_input=True, show_default=False, err=True
329)     )

330) 
331) 

332) class OptionGroupOption(click.Option):

333)     """A [`click.Option`][] with an associated group name and group epilog.
334) 
335)     Used by [`derivepassphrase.cli.CommandWithHelpGroups`][] to print
336)     help sections.  Each subclass contains its own group name and
337)     epilog.
338) 
339)     Attributes:
340)         option_group_name:
341)             The name of the option group.  Used as a heading on the help
342)             text for options in this section.
343)         epilog:
344)             An epilog to print after listing the options in this
345)             section.
346) 
347)     """

348) 

349)     option_group_name: str = ''
350)     epilog: str = ''
351) 
352)     def __init__(self, *args, **kwargs):  # type: ignore
353)         if self.__class__ == __class__:

354)             raise NotImplementedError
355)         super().__init__(*args, **kwargs)

356) 

357) 
358) class CommandWithHelpGroups(click.Command):

359)     """A [`click.Command`][] with support for help/option groups.
360) 
361)     Inspired by [a comment on `pallets/click#373`][CLICK_ISSUE], and
362)     further modified to support group epilogs.
363) 
364)     [CLICK_ISSUE]: https://github.com/pallets/click/issues/373#issuecomment-515293746
365) 
366)     """
367) 

368)     def format_options(

369)         self,
370)         ctx: click.Context,
371)         formatter: click.HelpFormatter,

372)     ) -> None:

373)         r"""Format options on the help listing, grouped into sections.
374) 

375)         This is a callback for [`click.Command.get_help`][] that
376)         implements the `--help` listing, by calling appropriate methods
377)         of the `formatter`.  We list all options (like the base
378)         implementation), but grouped into sections according to the
379)         concrete [`click.Option`][] subclass being used.  If the option
380)         is an instance of some subclass `X` of
381)         [`derivepassphrase.cli.OptionGroupOption`][], then the section
382)         heading and the epilog are taken from `X.option_group_name` and
383)         `X.epilog`; otherwise, the section heading is "Options" (or
384)         "Other options" if there are other option groups) and the epilog
385)         is empty.

386) 
387)         Args:
388)             ctx:
389)                 The click context.
390)             formatter:
391)                 The formatter for the `--help` listing.
392) 

393)         Returns:
394)             Nothing.  Output is generated by calling appropriate methods
395)             on `formatter` instead.
396) 

397)         """

398)         help_records: dict[str, list[tuple[str, str]]] = {}
399)         epilogs: dict[str, str] = {}
400)         params = self.params[:]

401)         if (  # pragma: no branch
402)             (help_opt := self.get_help_option(ctx)) is not None
403)             and help_opt not in params
404)         ):

405)             params.append(help_opt)
406)         for param in params:
407)             rec = param.get_help_record(ctx)
408)             if rec is not None:
409)                 if isinstance(param, OptionGroupOption):
410)                     group_name = param.option_group_name
411)                     epilogs.setdefault(group_name, param.epilog)
412)                 else:
413)                     group_name = ''
414)                 help_records.setdefault(group_name, []).append(rec)
415)         default_group = help_records.pop('')

416)         default_group_name = (
417)             'Other Options' if len(default_group) > 1 else 'Options'
418)         )

419)         help_records[default_group_name] = default_group
420)         for group_name, records in help_records.items():
421)             with formatter.section(group_name):
422)                 formatter.write_dl(records)
423)             epilog = inspect.cleandoc(epilogs.get(group_name, ''))
424)             if epilog:
425)                 formatter.write_paragraph()
426)                 with formatter.indentation():
427)                     formatter.write_text(epilog)
428) 

429) 

430) # Concrete option groups used by this command-line interface.
431) class PasswordGenerationOption(OptionGroupOption):

432)     """Password generation options for the CLI."""

433) 

434)     option_group_name = 'Password generation'

435)     epilog = """

436)         Use NUMBER=0, e.g. "--symbol 0", to exclude a character type
437)         from the output.

438)     """

439) 

440) 
441) class ConfigurationOption(OptionGroupOption):

442)     """Configuration options for the CLI."""

443) 

444)     option_group_name = 'Configuration'

445)     epilog = """

446)         Use $VISUAL or $EDITOR to configure the spawned editor.

447)     """

448) 

449) 
450) class StorageManagementOption(OptionGroupOption):

451)     """Storage management options for the CLI."""

452) 

453)     option_group_name = 'Storage management'

454)     epilog = """

455)         Using "-" as PATH for standard input/standard output is
456)         supported.

457)     """
458) 

459) 

460) def _validate_occurrence_constraint(

461)     ctx: click.Context,
462)     param: click.Parameter,
463)     value: Any,

464) ) -> int | None:

465)     """Check that the occurrence constraint is valid (int, 0 or larger)."""

466)     del ctx  # Unused.

467)     del param  # Unused.

468)     if value is None:
469)         return value
470)     if isinstance(value, int):
471)         int_value = value
472)     else:
473)         try:
474)             int_value = int(value, 10)
475)         except ValueError as e:

476)             msg = 'not an integer'
477)             raise click.BadParameter(msg) from e

478)     if int_value < 0:

479)         msg = 'not a non-negative integer'
480)         raise click.BadParameter(msg)

481)     return int_value
482) 

483) 
484) def _validate_length(

485)     ctx: click.Context,
486)     param: click.Parameter,
487)     value: Any,

488) ) -> int | None:

489)     """Check that the length is valid (int, 1 or larger)."""

490)     del ctx  # Unused.

491)     del param  # Unused.

492)     if value is None:
493)         return value
494)     if isinstance(value, int):
495)         int_value = value
496)     else:
497)         try:
498)             int_value = int(value, 10)
499)         except ValueError as e:

500)             msg = 'not an integer'
501)             raise click.BadParameter(msg) from e

502)     if int_value < 1:

503)         msg = 'not a positive integer'
504)         raise click.BadParameter(msg)

505)     return int_value
506) 

507) 
508) DEFAULT_NOTES_TEMPLATE = """\

509) # Enter notes below the line with the cut mark (ASCII scissors and
510) # dashes).  Lines above the cut mark (such as this one) will be ignored.
511) #
512) # If you wish to clear the notes, leave everything beyond the cut mark
513) # blank.  However, if you leave the *entire* file blank, also removing
514) # the cut mark, then the edit is aborted, and the old notes contents are
515) # retained.
516) #
517) # - - - - - >8 - - - - - >8 - - - - - >8 - - - - - >8 - - - - -

518) """

519) DEFAULT_NOTES_MARKER = '# - - - - - >8 - - - - -'
520) 
521) 

522) @click.command(

523)     context_settings={'help_option_names': ['-h', '--help']},

524)     cls=CommandWithHelpGroups,

525)     epilog=r"""

526)         WARNING: There is NO WAY to retrieve the generated passphrases
527)         if the master passphrase, the SSH key, or the exact passphrase
528)         settings are lost, short of trying out all possible
529)         combinations.  You are STRONGLY advised to keep independent
530)         backups of the settings and the SSH key, if any.

531) 
532)         Configuration is stored in a directory according to the
533)         DERIVEPASSPHRASE_PATH variable, which defaults to
534)         `~/.derivepassphrase` on UNIX-like systems and
535)         `C:\Users\<user>\AppData\Roaming\Derivepassphrase` on Windows.
536)         The configuration is NOT encrypted, and you are STRONGLY
537)         discouraged from using a stored passphrase.

538)     """,
539) )
540) @click.option(
541)     '-p',
542)     '--phrase',
543)     'use_phrase',
544)     is_flag=True,
545)     help='prompts you for your passphrase',
546)     cls=PasswordGenerationOption,
547) )
548) @click.option(
549)     '-k',
550)     '--key',
551)     'use_key',
552)     is_flag=True,
553)     help='uses your SSH private key to generate passwords',
554)     cls=PasswordGenerationOption,
555) )
556) @click.option(
557)     '-l',
558)     '--length',
559)     metavar='NUMBER',
560)     callback=_validate_length,
561)     help='emits password of length NUMBER',
562)     cls=PasswordGenerationOption,
563) )
564) @click.option(
565)     '-r',
566)     '--repeat',
567)     metavar='NUMBER',
568)     callback=_validate_occurrence_constraint,
569)     help='allows maximum of NUMBER repeated adjacent chars',
570)     cls=PasswordGenerationOption,
571) )
572) @click.option(
573)     '--lower',
574)     metavar='NUMBER',
575)     callback=_validate_occurrence_constraint,
576)     help='includes at least NUMBER lowercase letters',
577)     cls=PasswordGenerationOption,
578) )
579) @click.option(
580)     '--upper',
581)     metavar='NUMBER',
582)     callback=_validate_occurrence_constraint,
583)     help='includes at least NUMBER uppercase letters',
584)     cls=PasswordGenerationOption,
585) )
586) @click.option(
587)     '--number',
588)     metavar='NUMBER',
589)     callback=_validate_occurrence_constraint,
590)     help='includes at least NUMBER digits',
591)     cls=PasswordGenerationOption,
592) )
593) @click.option(
594)     '--space',
595)     metavar='NUMBER',
596)     callback=_validate_occurrence_constraint,
597)     help='includes at least NUMBER spaces',
598)     cls=PasswordGenerationOption,
599) )
600) @click.option(
601)     '--dash',
602)     metavar='NUMBER',
603)     callback=_validate_occurrence_constraint,
604)     help='includes at least NUMBER "-" or "_"',
605)     cls=PasswordGenerationOption,
606) )
607) @click.option(
608)     '--symbol',
609)     metavar='NUMBER',
610)     callback=_validate_occurrence_constraint,
611)     help='includes at least NUMBER symbol chars',
612)     cls=PasswordGenerationOption,
613) )
614) @click.option(
615)     '-n',
616)     '--notes',
617)     'edit_notes',
618)     is_flag=True,
619)     help='spawn an editor to edit notes for SERVICE',
620)     cls=ConfigurationOption,
621) )
622) @click.option(
623)     '-c',
624)     '--config',
625)     'store_config_only',
626)     is_flag=True,
627)     help='saves the given settings for SERVICE or global',
628)     cls=ConfigurationOption,
629) )
630) @click.option(
631)     '-x',
632)     '--delete',
633)     'delete_service_settings',
634)     is_flag=True,
635)     help='deletes settings for SERVICE',
636)     cls=ConfigurationOption,
637) )
638) @click.option(
639)     '--delete-globals',
640)     is_flag=True,
641)     help='deletes the global shared settings',
642)     cls=ConfigurationOption,
643) )
644) @click.option(
645)     '-X',
646)     '--clear',
647)     'clear_all_settings',
648)     is_flag=True,
649)     help='deletes all settings',
650)     cls=ConfigurationOption,
651) )
652) @click.option(
653)     '-e',
654)     '--export',
655)     'export_settings',
656)     metavar='PATH',
657)     type=click.Path(file_okay=True, allow_dash=True, exists=False),
658)     help='export all saved settings into file PATH',
659)     cls=StorageManagementOption,
660) )
661) @click.option(
662)     '-i',
663)     '--import',
664)     'import_settings',
665)     metavar='PATH',
666)     type=click.Path(file_okay=True, allow_dash=True, exists=False),
667)     help='import saved settings from file PATH',
668)     cls=StorageManagementOption,

669) )

670) @click.version_option(version=dpp.__version__, prog_name=PROG_NAME)

671) @click.argument('service', required=False)
672) @click.pass_context
673) def derivepassphrase(

674)     ctx: click.Context,
675)     /,
676)     *,

677)     service: str | None = None,
678)     use_phrase: bool = False,
679)     use_key: bool = False,
680)     length: int | None = None,
681)     repeat: int | None = None,
682)     lower: int | None = None,
683)     upper: int | None = None,
684)     number: int | None = None,
685)     space: int | None = None,
686)     dash: int | None = None,
687)     symbol: int | None = None,
688)     edit_notes: bool = False,
689)     store_config_only: bool = False,
690)     delete_service_settings: bool = False,
691)     delete_globals: bool = False,
692)     clear_all_settings: bool = False,
693)     export_settings: TextIO | pathlib.Path | os.PathLike[str] | None = None,
694)     import_settings: TextIO | pathlib.Path | os.PathLike[str] | None = None,

695) ) -> None:
696)     """Derive a strong passphrase, deterministically, from a master secret.
697) 

698)     Using a master passphrase or a master SSH key, derive a passphrase
699)     for SERVICE, subject to length, character and character repetition
700)     constraints.  The derivation is cryptographically strong, meaning
701)     that even if a single passphrase is compromised, guessing the master
702)     passphrase or a different service's passphrase is computationally
703)     infeasible.  The derivation is also deterministic, given the same
704)     inputs, thus the resulting passphrase need not be stored explicitly.
705)     The service name and constraints themselves also need not be kept
706)     secret; the latter are usually stored in a world-readable file.

707) 
708)     If operating on global settings, or importing/exporting settings,
709)     then SERVICE must be omitted.  Otherwise it is required.\f
710) 
711)     This is a [`click`][CLICK]-powered command-line interface function,
712)     and not intended for programmatic use.  Call with arguments

713)     `['--help']` to see full documentation of the interface.  (See also
714)     [`click.testing.CliRunner`][] for controlled, programmatic
715)     invocation.)

716) 
717)     [CLICK]: https://click.palletsprojects.com/
718) 
719)     Parameters:
720)         ctx (click.Context):
721)             The `click` context.
722) 
723)     Other Parameters:

724)         service:

725)             A service name.  Required, unless operating on global
726)             settings or importing/exporting settings.

727)         use_phrase:

728)             Command-line argument `-p`/`--phrase`.  If given, query the
729)             user for a passphrase instead of an SSH key.

730)         use_key:

731)             Command-line argument `-k`/`--key`.  If given, query the
732)             user for an SSH key instead of a passphrase.

733)         length:

734)             Command-line argument `-l`/`--length`.  Override the default
735)             length of the generated passphrase.

736)         repeat:

737)             Command-line argument `-r`/`--repeat`.  Override the default
738)             repetition limit if positive, or disable the repetition
739)             limit if 0.

740)         lower:

741)             Command-line argument `--lower`.  Require a given amount of
742)             ASCII lowercase characters if positive, else forbid ASCII
743)             lowercase characters if 0.

744)         upper:

745)             Command-line argument `--upper`.  Same as `lower`, but for
746)             ASCII uppercase characters.

747)         number:

748)             Command-line argument `--number`.  Same as `lower`, but for
749)             ASCII digits.

750)         space:

751)             Command-line argument `--number`.  Same as `lower`, but for
752)             the space character.

753)         dash:

754)             Command-line argument `--number`.  Same as `lower`, but for
755)             the hyphen-minus and underscore characters.

756)         symbol:

757)             Command-line argument `--number`.  Same as `lower`, but for
758)             all other ASCII printable characters (except backquote).

759)         edit_notes:

760)             Command-line argument `-n`/`--notes`.  If given, spawn an
761)             editor to edit notes for `service`.

762)         store_config_only:

763)             Command-line argument `-c`/`--config`.  If given, saves the
764)             other given settings (`--key`, ..., `--symbol`) to the
765)             configuration file, either specifically for `service` or as
766)             global settings.

767)         delete_service_settings:

768)             Command-line argument `-x`/`--delete`.  If given, removes
769)             the settings for `service` from the configuration file.

770)         delete_globals:

771)             Command-line argument `--delete-globals`.  If given, removes
772)             the global settings from the configuration file.

773)         clear_all_settings:

774)             Command-line argument `-X`/`--clear`.  If given, removes all
775)             settings from the configuration file.

776)         export_settings:
777)             Command-line argument `-e`/`--export`.  If a file object,
778)             then it must be open for writing and accept `str` inputs.
779)             Otherwise, a filename to open for writing.  Using `-` for
780)             standard output is supported.
781)         import_settings:
782)             Command-line argument `-i`/`--import`.  If a file object, it
783)             must be open for reading and yield `str` values.  Otherwise,
784)             a filename to open for reading.  Using `-` for standard
785)             input is supported.

786) 
787)     """

788) 
789)     options_in_group: dict[type[click.Option], list[click.Option]] = {}
790)     params_by_str: dict[str, click.Parameter] = {}

791)     for param in ctx.command.params:
792)         if isinstance(param, click.Option):
793)             group: type[click.Option]

794)             match param:
795)                 case PasswordGenerationOption():
796)                     group = PasswordGenerationOption
797)                 case ConfigurationOption():
798)                     group = ConfigurationOption
799)                 case StorageManagementOption():
800)                     group = StorageManagementOption
801)                 case OptionGroupOption():

802)                     raise AssertionError(  # noqa: TRY003

803)                         f'Unknown option group for {param!r}'  # noqa: EM102
804)                     )

805)                 case _:
806)                     group = click.Option
807)             options_in_group.setdefault(group, []).append(param)
808)         params_by_str[param.human_readable_name] = param
809)         for name in param.opts + param.secondary_opts:
810)             params_by_str[name] = param
811) 
812)     def is_param_set(param: click.Parameter):
813)         return bool(ctx.params.get(param.human_readable_name))
814) 

815)     def check_incompatible_options(

816)         param: click.Parameter | str,
817)         *incompatible: click.Parameter | str,

818)     ) -> None:

819)         if isinstance(param, str):
820)             param = params_by_str[param]
821)         assert isinstance(param, click.Parameter)
822)         if not is_param_set(param):

823)             return
824)         for other in incompatible:

825)             if isinstance(other, str):

826)                 other = params_by_str[other]  # noqa: PLW2901

827)             assert isinstance(other, click.Parameter)
828)             if other != param and is_param_set(other):
829)                 opt_str = param.opts[0]
830)                 other_str = other.opts[0]
831)                 raise click.BadOptionUsage(

832)                     opt_str, f'mutually exclusive with {other_str}', ctx=ctx
833)                 )

834) 
835)     def get_config() -> dpp_types.VaultConfig:
836)         try:
837)             return _load_config()
838)         except FileNotFoundError:
839)             return {'services': {}}

840)         except Exception as e:  # noqa: BLE001

841)             ctx.fail(f'cannot load config: {e}')
842) 
843)     configuration: dpp_types.VaultConfig
844) 
845)     check_incompatible_options('--phrase', '--key')

846)     for group in (ConfigurationOption, StorageManagementOption):

847)         for opt in options_in_group[group]:
848)             if opt != params_by_str['--config']:
849)                 check_incompatible_options(

850)                     opt, *options_in_group[PasswordGenerationOption]
851)                 )

852) 

853)     for group in (ConfigurationOption, StorageManagementOption):

854)         for opt in options_in_group[group]:
855)             check_incompatible_options(

856)                 opt,
857)                 *options_in_group[ConfigurationOption],
858)                 *options_in_group[StorageManagementOption],
859)             )
860)     sv_options = options_in_group[PasswordGenerationOption] + [
861)         params_by_str['--notes'],
862)         params_by_str['--delete'],
863)     ]

864)     sv_options.remove(params_by_str['--key'])
865)     sv_options.remove(params_by_str['--phrase'])
866)     for param in sv_options:
867)         if is_param_set(param) and not service:
868)             opt_str = param.opts[0]

869)             msg = f'{opt_str} requires a SERVICE'
870)             raise click.UsageError(msg)

871)     for param in [params_by_str['--key'], params_by_str['--phrase']]:

872)         if is_param_set(param) and not (
873)             service or is_param_set(params_by_str['--config'])

874)         ):
875)             opt_str = param.opts[0]

876)             msg = f'{opt_str} requires a SERVICE or --config'
877)             raise click.UsageError(msg)

878)     no_sv_options = [
879)         params_by_str['--delete-globals'],
880)         params_by_str['--clear'],
881)         *options_in_group[StorageManagementOption],
882)     ]

883)     for param in no_sv_options:
884)         if is_param_set(param) and service:
885)             opt_str = param.opts[0]

886)             msg = f'{opt_str} does not take a SERVICE argument'
887)             raise click.UsageError(msg)

888) 
889)     if edit_notes:
890)         assert service is not None
891)         configuration = get_config()

892)         text = DEFAULT_NOTES_TEMPLATE + configuration['services'].get(
893)             service, cast(dpp_types.VaultConfigServicesSettings, {})
894)         ).get('notes', '')

895)         notes_value = click.edit(text=text)
896)         if notes_value is not None:
897)             notes_lines = collections.deque(notes_value.splitlines(True))
898)             while notes_lines:
899)                 line = notes_lines.popleft()
900)                 if line.startswith(DEFAULT_NOTES_MARKER):
901)                     notes_value = ''.join(notes_lines)
902)                     break
903)             else:
904)                 if not notes_value.strip():
905)                     ctx.fail('not saving new notes: user aborted request')
906)             configuration['services'].setdefault(service, {})['notes'] = (

907)                 notes_value.strip('\n')
908)             )

909)             _save_config(configuration)
910)     elif delete_service_settings:
911)         assert service is not None
912)         configuration = get_config()
913)         if service in configuration['services']:
914)             del configuration['services'][service]
915)             _save_config(configuration)
916)     elif delete_globals:
917)         configuration = get_config()
918)         if 'global' in configuration:
919)             del configuration['global']
920)             _save_config(configuration)
921)     elif clear_all_settings:
922)         _save_config({'services': {}})
923)     elif import_settings:
924)         try:
925)             # TODO: keep track of auto-close; try os.dup if feasible

926)             infile = (
927)                 cast(TextIO, import_settings)
928)                 if hasattr(import_settings, 'close')
929)                 else click.open_file(os.fspath(import_settings), 'rt')
930)             )

931)             with infile:
932)                 maybe_config = json.load(infile)
933)         except json.JSONDecodeError as e:
934)             ctx.fail(f'Cannot load config: cannot decode JSON: {e}')
935)         except OSError as e:
936)             ctx.fail(f'Cannot load config: {e.strerror}')
937)         if dpp_types.is_vault_config(maybe_config):
938)             _save_config(maybe_config)
939)         else:
940)             ctx.fail('not a valid config')
941)     elif export_settings:
942)         configuration = get_config()
943)         try:
944)             # TODO: keep track of auto-close; try os.dup if feasible

945)             outfile = (
946)                 cast(TextIO, export_settings)
947)                 if hasattr(export_settings, 'close')
948)                 else click.open_file(os.fspath(export_settings), 'wt')
949)             )

950)             with outfile:
951)                 json.dump(configuration, outfile)
952)         except OSError as e:

953)             ctx.fail(f'cannot write config: {e.strerror}')

954)     else:
955)         configuration = get_config()
956)         # This block could be type checked more stringently, but this
957)         # would probably involve a lot of code repetition.  Since we
958)         # have a type guarding function anyway, assert that we didn't
959)         # make any mistakes at the end instead.
960)         global_keys = {'key', 'phrase'}

961)         service_keys = {
962)             'key',
963)             'phrase',
964)             'length',
965)             'repeat',
966)             'lower',
967)             'upper',
968)             'number',
969)             'space',
970)             'dash',
971)             'symbol',
972)         }

973)         settings: collections.ChainMap[str, Any] = collections.ChainMap(

974)             {
975)                 k: v
976)                 for k, v in locals().items()
977)                 if k in service_keys and v is not None
978)             },
979)             cast(
980)                 dict[str, Any],
981)                 configuration['services'].get(service or '', {}),
982)             ),

983)             {},

984)             cast(dict[str, Any], configuration.get('global', {})),

985)         )
986)         if use_key:
987)             try:

988)                 key = base64.standard_b64encode(_select_ssh_key()).decode(
989)                     'ASCII'
990)                 )

991)             except IndexError:
992)                 ctx.fail('no valid SSH key selected')

993)             except (LookupError, RuntimeError) as e:

994)                 ctx.fail(str(e))
995)         elif use_phrase:
996)             maybe_phrase = _prompt_for_passphrase()
997)             if not maybe_phrase:
998)                 ctx.fail('no passphrase given')
999)             else:
1000)                 phrase = maybe_phrase
1001)         if store_config_only:
1002)             view: collections.ChainMap[str, Any]

1003)             view = (
1004)                 collections.ChainMap(*settings.maps[:2])
1005)                 if service
1006)                 else settings.parents.parents
1007)             )

1008)             if use_key:
1009)                 view['key'] = key
1010)                 for m in view.maps:
1011)                     m.pop('phrase', '')
1012)             elif use_phrase:
1013)                 view['phrase'] = phrase
1014)                 for m in view.maps:
1015)                     m.pop('key', '')

1016)             if not view.maps[0]:
1017)                 settings_type = 'service' if service else 'global'

1018)                 msg = (
1019)                     f'cannot update {settings_type} settings without '
1020)                     f'actual settings'
1021)                 )

1022)                 raise click.UsageError(msg)

1023)             if service:

1024)                 configuration['services'].setdefault(service, {}).update(view)  # type: ignore[typeddict-item]

1025)             else:

1026)                 configuration.setdefault('global', {}).update(view)  # type: ignore[typeddict-item]
1027)             assert dpp_types.is_vault_config(
1028)                 configuration
1029)             ), f'invalid vault configuration: {configuration!r}'

1030)             _save_config(configuration)
1031)         else:
1032)             if not service:

1033)                 msg = 'SERVICE is required'
1034)                 raise click.UsageError(msg)

1035)             kwargs: dict[str, Any] = {
1036)                 k: v
1037)                 for k, v in settings.items()
1038)                 if k in service_keys and v is not None
1039)             }
1040) 

1041)             # If either --key or --phrase are given, use that setting.
1042)             # Otherwise, if both key and phrase are set in the config,
1043)             # one must be global (ignore it) and one must be
1044)             # service-specific (use that one). Otherwise, if only one of
1045)             # key and phrase is set in the config, use that one.  In all
1046)             # these above cases, set the phrase via
1047)             # derivepassphrase.Vault.phrase_from_key if a key is
1048)             # given. Finally, if nothing is set, error out.

1049)             def key_to_phrase(

1050)                 key: str | bytes | bytearray,

1051)             ) -> bytes | bytearray:
1052)                 return dpp.Vault.phrase_from_key(

1053)                     base64.standard_b64decode(key)
1054)                 )
1055) 

1056)             if use_key or use_phrase:
1057)                 if use_key:
1058)                     kwargs['phrase'] = key_to_phrase(key)
1059)                 else:
1060)                     kwargs['phrase'] = phrase
1061)                     kwargs.pop('key', '')
1062)             elif kwargs.get('phrase') and kwargs.get('key'):
1063)                 if any('key' in m for m in settings.maps[:2]):
1064)                     kwargs['phrase'] = key_to_phrase(kwargs.pop('key'))
1065)                 else:
1066)                     kwargs.pop('key')
1067)             elif kwargs.get('key'):
1068)                 kwargs['phrase'] = key_to_phrase(kwargs.pop('key'))
1069)             elif kwargs.get('phrase'):
1070)                 pass
1071)             else:

1072)                 msg = (
1073)                     'no passphrase or key given on command-line '
1074)                     'or in configuration'
1075)                 )

1076)                 raise click.UsageError(msg)

1077)             vault = dpp.Vault(**kwargs)
1078)             result = vault.generate(service)
1079)             click.echo(result.decode('ASCII'))