plomlompom.com Git - plomtask/blob - plomtask/http.py

   1 """Web server stuff."""
   2 from __future__ import annotations
   3 from dataclasses import dataclass
   4 from typing import Any, Callable
   5 from base64 import b64encode, b64decode
   6 from http.server import BaseHTTPRequestHandler
   7 from http.server import HTTPServer
   8 from urllib.parse import urlparse, parse_qs
   9 from os.path import split as path_split
  10 from jinja2 import Environment as JinjaEnv, FileSystemLoader as JinjaFSLoader
  11 from plomtask.dating import date_in_n_days
  12 from plomtask.days import Day
  13 from plomtask.exceptions import HandledException, BadFormatException, \
  14         NotFoundException
  15 from plomtask.db import DatabaseConnection, DatabaseFile
  16 from plomtask.processes import Process, ProcessStep, ProcessStepsNode
  17 from plomtask.conditions import Condition
  18 from plomtask.todos import Todo
  19
  20 TEMPLATES_DIR = 'templates'
  21
  22
  23 class TaskServer(HTTPServer):
  24     """Variant of HTTPServer that knows .jinja as Jinja Environment."""
  25
  26     def __init__(self, db_file: DatabaseFile,
  27                  *args: Any, **kwargs: Any) -> None:
  28         super().__init__(*args, **kwargs)
  29         self.db = db_file
  30         self.jinja = JinjaEnv(loader=JinjaFSLoader(TEMPLATES_DIR))
  31
  32
  33 class InputsParser:
  34     """Wrapper for validating and retrieving dict-like HTTP inputs."""
  35
  36     def __init__(self, dict_: dict[str, list[str]],
  37                  strictness: bool = True) -> None:
  38         self.inputs = dict_
  39         self.strict = strictness
  40
  41     def get_str(self, key: str, default: str = '',
  42                 ignore_strict: bool = False) -> str:
  43         """Retrieve single/first string value of key, or default."""
  44         if key not in self.inputs.keys() or 0 == len(self.inputs[key]):
  45             if self.strict and not ignore_strict:
  46                 raise BadFormatException(f'no value found for key {key}')
  47             return default
  48         return self.inputs[key][0]
  49
  50     def get_first_strings_starting(self, prefix: str) -> dict[str, str]:
  51         """Retrieve dict of (first) strings at key starting with prefix."""
  52         ret = {}
  53         for key in [k for k in self.inputs.keys() if k.startswith(prefix)]:
  54             ret[key] = self.inputs[key][0]
  55         return ret
  56
  57     def get_int(self, key: str) -> int:
  58         """Retrieve single/first value of key as int, error if empty."""
  59         val = self.get_int_or_none(key)
  60         if val is None:
  61             raise BadFormatException(f'unexpected empty value for: {key}')
  62         return val
  63
  64     def get_int_or_none(self, key: str) -> int | None:
  65         """Retrieve single/first value of key as int, return None if empty."""
  66         val = self.get_str(key, ignore_strict=True)
  67         if val == '':
  68             return None
  69         try:
  70             return int(val)
  71         except ValueError as e:
  72             msg = f'cannot int form field value for key {key}: {val}'
  73             raise BadFormatException(msg) from e
  74
  75     def get_float(self, key: str) -> float:
  76         """Retrieve float value of key from self.postvars."""
  77         val = self.get_str(key)
  78         try:
  79             return float(val)
  80         except ValueError as e:
  81             msg = f'cannot float form field value for key {key}: {val}'
  82             raise BadFormatException(msg) from e
  83
  84     def get_all_str(self, key: str) -> list[str]:
  85         """Retrieve list of string values at key."""
  86         if key not in self.inputs.keys():
  87             return []
  88         return self.inputs[key]
  89
  90     def get_all_int(self, key: str) -> list[int]:
  91         """Retrieve list of int values at key."""
  92         all_str = self.get_all_str(key)
  93         try:
  94             return [int(s) for s in all_str if len(s) > 0]
  95         except ValueError as e:
  96             msg = f'cannot int a form field value for key {key} in: {all_str}'
  97             raise BadFormatException(msg) from e
  98
  99
 100 class TaskHandler(BaseHTTPRequestHandler):
 101     """Handles single HTTP request."""
 102     # pylint: disable=too-many-public-methods
 103     server: TaskServer
 104     conn: DatabaseConnection
 105     _site: str
 106     _form_data: InputsParser
 107     _params: InputsParser
 108
 109     def _send_html(self, html: str, code: int = 200) -> None:
 110         """Send HTML as proper HTTP response."""
 111         self.send_response(code)
 112         self.end_headers()
 113         self.wfile.write(bytes(html, 'utf-8'))
 114
 115     @staticmethod
 116     def _request_wrapper(http_method: str, not_found_msg: str
 117                          ) -> Callable[..., Callable[[TaskHandler], None]]:
 118         def decorator(f: Callable[..., str | None]
 119                       ) -> Callable[[TaskHandler], None]:
 120             def wrapper(self: TaskHandler) -> None:
 121                 # pylint: disable=protected-access
 122                 # (because pylint here fails to detect the use of wrapper as a
 123                 # method to self with respective access privileges)
 124                 try:
 125                     self.conn = DatabaseConnection(self.server.db)
 126                     parsed_url = urlparse(self.path)
 127                     self._site = path_split(parsed_url.path)[1]
 128                     params = parse_qs(parsed_url.query, strict_parsing=True)
 129                     self._params = InputsParser(params, False)
 130                     handler_name = f'do_{http_method}_{self._site}'
 131                     if hasattr(self, handler_name):
 132                         handler = getattr(self, handler_name)
 133                         redir_target = f(self, handler)
 134                         if redir_target:
 135                             self.send_response(302)
 136                             self.send_header('Location', redir_target)
 137                             self.end_headers()
 138                     else:
 139                         msg = f'{not_found_msg}: {self._site}'
 140                         raise NotFoundException(msg)
 141                 except HandledException as error:
 142                     for cls in (Day, Todo, Condition, Process, ProcessStep):
 143                         assert hasattr(cls, 'empty_cache')
 144                         cls.empty_cache()
 145                     tmpl = self.server.jinja.get_template('msg.html')
 146                     html = tmpl.render(msg=error)
 147                     self._send_html(html, error.http_code)
 148                 finally:
 149                     self.conn.close()
 150             return wrapper
 151         return decorator
 152
 153     @_request_wrapper('GET', 'Unknown page')
 154     def do_GET(self, handler: Callable[[], str | dict[str, object]]
 155                ) -> str | None:
 156         """Render page with result of handler, or redirect if result is str."""
 157         template = f'{self._site}.html'
 158         ctx_or_redir = handler()
 159         if str == type(ctx_or_redir):
 160             return ctx_or_redir
 161         assert isinstance(ctx_or_redir, dict)
 162         html = self.server.jinja.get_template(template).render(**ctx_or_redir)
 163         self._send_html(html)
 164         return None
 165
 166     @_request_wrapper('POST', 'Unknown POST target')
 167     def do_POST(self, handler: Callable[[], str]) -> str:
 168         """Handle POST with handler, prepare redirection to result."""
 169         length = int(self.headers['content-length'])
 170         postvars = parse_qs(self.rfile.read(length).decode(),
 171                             keep_blank_values=True, strict_parsing=True)
 172         self._form_data = InputsParser(postvars)
 173         redir_target = handler()
 174         self.conn.commit()
 175         return redir_target
 176
 177     # GET handlers
 178
 179     def do_GET_(self) -> str:
 180         """Return redirect target on GET /."""
 181         return '/day'
 182
 183     def _do_GET_calendar(self) -> dict[str, object]:
 184         """Show Days from ?start= to ?end=.
 185
 186         Both .do_GET_calendar and .do_GET_calendar_txt refer to this to do the
 187         same, the only difference being the HTML template they are rendered to,
 188         which .do_GET selects from their method name.
 189         """
 190         start = self._params.get_str('start')
 191         end = self._params.get_str('end')
 192         if not end:
 193             end = date_in_n_days(366)
 194         ret = Day.by_date_range_with_limits(self.conn, (start, end), 'id')
 195         days, start, end = ret
 196         days = Day.with_filled_gaps(days, start, end)
 197         today = date_in_n_days(0)
 198         return {'start': start, 'end': end, 'days': days, 'today': today}
 199
 200     def do_GET_calendar(self) -> dict[str, object]:
 201         """Show Days from ?start= to ?end= – normal view."""
 202         return self._do_GET_calendar()
 203
 204     def do_GET_calendar_txt(self) -> dict[str, object]:
 205         """Show Days from ?start= to ?end= – minimalist view."""
 206         return self._do_GET_calendar()
 207
 208     def do_GET_day(self) -> dict[str, object]:
 209         """Show single Day of ?date=."""
 210         date = self._params.get_str('date', date_in_n_days(0))
 211         day = Day.by_id(self.conn, date, create=True)
 212         make_type = self._params.get_str('make_type')
 213         conditions_present = []
 214         enablers_for = {}
 215         disablers_for = {}
 216         for todo in day.todos:
 217             for condition in todo.conditions + todo.blockers:
 218                 if condition not in conditions_present:
 219                     conditions_present += [condition]
 220                     enablers_for[condition.id_] = [p for p in
 221                                                    Process.all(self.conn)
 222                                                    if condition in p.enables]
 223                     disablers_for[condition.id_] = [p for p in
 224                                                     Process.all(self.conn)
 225                                                     if condition in p.disables]
 226         seen_todos: set[int] = set()
 227         top_nodes = [t.get_step_tree(seen_todos)
 228                      for t in day.todos if not t.parents]
 229         return {'day': day,
 230                 'top_nodes': top_nodes,
 231                 'make_type': make_type,
 232                 'enablers_for': enablers_for,
 233                 'disablers_for': disablers_for,
 234                 'conditions_present': conditions_present,
 235                 'processes': Process.all(self.conn)}
 236
 237     def do_GET_todo(self) -> dict[str, object]:
 238         """Show single Todo of ?id=."""
 239
 240         @dataclass
 241         class TodoStepsNode:
 242             """Collect what's useful for Todo steps tree display."""
 243             id_: int
 244             todo: Todo | None
 245             process: Process | None
 246             children: list[TodoStepsNode]  # pylint: disable=undefined-variable
 247             fillable: bool = False
 248
 249         def walk_process_steps(id_: int,
 250                                process_step_nodes: list[ProcessStepsNode],
 251                                steps_nodes: list[TodoStepsNode]) -> None:
 252             for process_step_node in process_step_nodes:
 253                 id_ += 1
 254                 node = TodoStepsNode(id_, None, process_step_node.process, [])
 255                 steps_nodes += [node]
 256                 walk_process_steps(id_, list(process_step_node.steps.values()),
 257                                    node.children)
 258
 259         def walk_todo_steps(id_: int, todos: list[Todo],
 260                             steps_nodes: list[TodoStepsNode]) -> None:
 261             for todo in todos:
 262                 matched = False
 263                 for match in [item for item in steps_nodes
 264                               if item.process
 265                               and item.process == todo.process]:
 266                     match.todo = todo
 267                     matched = True
 268                     for child in match.children:
 269                         child.fillable = True
 270                     walk_todo_steps(id_, todo.children, match.children)
 271                 if not matched:
 272                     id_ += 1
 273                     node = TodoStepsNode(id_, todo, None, [])
 274                     steps_nodes += [node]
 275                     walk_todo_steps(id_, todo.children, node.children)
 276
 277         def collect_adoptables_keys(steps_nodes: list[TodoStepsNode]
 278                                     ) -> set[int]:
 279             ids = set()
 280             for node in steps_nodes:
 281                 if not node.todo:
 282                     assert isinstance(node.process, Process)
 283                     assert isinstance(node.process.id_, int)
 284                     ids.add(node.process.id_)
 285                 ids = ids | collect_adoptables_keys(node.children)
 286             return ids
 287
 288         id_ = self._params.get_int('id')
 289         todo = Todo.by_id(self.conn, id_)
 290         todo_steps = [step.todo for step in todo.get_step_tree(set()).children]
 291         process_tree = todo.process.get_steps(self.conn, None)
 292         steps_todo_to_process: list[TodoStepsNode] = []
 293         walk_process_steps(0, list(process_tree.values()),
 294                            steps_todo_to_process)
 295         for steps_node in steps_todo_to_process:
 296             steps_node.fillable = True
 297         walk_todo_steps(len(steps_todo_to_process), todo_steps,
 298                         steps_todo_to_process)
 299         adoptables: dict[int, list[Todo]] = {}
 300         any_adoptables = [Todo.by_id(self.conn, t.id_)
 301                           for t in Todo.by_date(self.conn, todo.date)
 302                           if t != todo]
 303         for id_ in collect_adoptables_keys(steps_todo_to_process):
 304             adoptables[id_] = [t for t in any_adoptables
 305                                if t.process.id_ == id_]
 306         return {'todo': todo, 'steps_todo_to_process': steps_todo_to_process,
 307                 'adoption_candidates_for': adoptables,
 308                 'process_candidates': Process.all(self.conn),
 309                 'todo_candidates': any_adoptables,
 310                 'condition_candidates': Condition.all(self.conn)}
 311
 312     def do_GET_todos(self) -> dict[str, object]:
 313         """Show Todos from ?start= to ?end=, of ?process=, ?comment= pattern"""
 314         sort_by = self._params.get_str('sort_by')
 315         start = self._params.get_str('start')
 316         end = self._params.get_str('end')
 317         process_id = self._params.get_int_or_none('process_id')
 318         comment_pattern = self._params.get_str('comment_pattern')
 319         todos = []
 320         ret = Todo.by_date_range_with_limits(self.conn, (start, end))
 321         todos_by_date_range, start, end = ret
 322         todos = [t for t in todos_by_date_range
 323                  if comment_pattern in t.comment
 324                  and ((not process_id) or t.process.id_ == process_id)]
 325         if sort_by == 'doneness':
 326             todos.sort(key=lambda t: t.is_done)
 327         elif sort_by == '-doneness':
 328             todos.sort(key=lambda t: t.is_done, reverse=True)
 329         elif sort_by == 'title':
 330             todos.sort(key=lambda t: t.title_then)
 331         elif sort_by == '-title':
 332             todos.sort(key=lambda t: t.title_then, reverse=True)
 333         elif sort_by == 'comment':
 334             todos.sort(key=lambda t: t.comment)
 335         elif sort_by == '-comment':
 336             todos.sort(key=lambda t: t.comment, reverse=True)
 337         elif sort_by == '-date':
 338             todos.sort(key=lambda t: t.date, reverse=True)
 339         else:
 340             todos.sort(key=lambda t: t.date)
 341         return {'start': start, 'end': end, 'process_id': process_id,
 342                 'comment_pattern': comment_pattern, 'todos': todos,
 343                 'all_processes': Process.all(self.conn), 'sort_by': sort_by}
 344
 345     def do_GET_conditions(self) -> dict[str, object]:
 346         """Show all Conditions."""
 347         pattern = self._params.get_str('pattern')
 348         conditions = Condition.matching(self.conn, pattern)
 349         sort_by = self._params.get_str('sort_by')
 350         if sort_by == 'is_active':
 351             conditions.sort(key=lambda c: c.is_active)
 352         elif sort_by == '-is_active':
 353             conditions.sort(key=lambda c: c.is_active, reverse=True)
 354         elif sort_by == '-title':
 355             conditions.sort(key=lambda c: c.title.newest, reverse=True)
 356         else:
 357             conditions.sort(key=lambda c: c.title.newest)
 358         return {'conditions': conditions,
 359                 'sort_by': sort_by,
 360                 'pattern': pattern}
 361
 362     def do_GET_condition(self) -> dict[str, object]:
 363         """Show Condition of ?id=."""
 364         id_ = self._params.get_int_or_none('id')
 365         c = Condition.by_id(self.conn, id_, create=True)
 366         ps = Process.all(self.conn)
 367         return {'condition': c, 'is_new': c.id_ is None,
 368                 'enabled_processes': [p for p in ps if c in p.conditions],
 369                 'disabled_processes': [p for p in ps if c in p.blockers],
 370                 'enabling_processes': [p for p in ps if c in p.enables],
 371                 'disabling_processes': [p for p in ps if c in p.disables]}
 372
 373     def do_GET_condition_titles(self) -> dict[str, object]:
 374         """Show title history of Condition of ?id=."""
 375         id_ = self._params.get_int_or_none('id')
 376         condition = Condition.by_id(self.conn, id_)
 377         return {'condition': condition}
 378
 379     def do_GET_condition_descriptions(self) -> dict[str, object]:
 380         """Show description historys of Condition of ?id=."""
 381         id_ = self._params.get_int_or_none('id')
 382         condition = Condition.by_id(self.conn, id_)
 383         return {'condition': condition}
 384
 385     def do_GET_process(self) -> dict[str, object]:
 386         """Show Process of ?id=."""
 387         id_ = self._params.get_int_or_none('id')
 388         process = Process.by_id(self.conn, id_, create=True)
 389         title_64 = self._params.get_str('title_b64')
 390         if title_64:
 391             title = b64decode(title_64.encode()).decode()
 392             process.title.set(title)
 393         owners = process.used_as_step_by(self.conn)
 394         for step_id in self._params.get_all_int('step_to'):
 395             owners += [Process.by_id(self.conn, step_id)]
 396         preset_top_step = None
 397         for process_id in self._params.get_all_int('has_step'):
 398             preset_top_step = process_id
 399         return {'process': process, 'is_new': process.id_ is None,
 400                 'preset_top_step': preset_top_step,
 401                 'steps': process.get_steps(self.conn), 'owners': owners,
 402                 'n_todos': len(Todo.by_process_id(self.conn, process.id_)),
 403                 'process_candidates': Process.all(self.conn),
 404                 'condition_candidates': Condition.all(self.conn)}
 405
 406     def do_GET_process_titles(self) -> dict[str, object]:
 407         """Show title history of Process of ?id=."""
 408         id_ = self._params.get_int_or_none('id')
 409         process = Process.by_id(self.conn, id_)
 410         return {'process': process}
 411
 412     def do_GET_process_descriptions(self) -> dict[str, object]:
 413         """Show description historys of Process of ?id=."""
 414         id_ = self._params.get_int_or_none('id')
 415         process = Process.by_id(self.conn, id_)
 416         return {'process': process}
 417
 418     def do_GET_process_efforts(self) -> dict[str, object]:
 419         """Show default effort history of Process of ?id=."""
 420         id_ = self._params.get_int_or_none('id')
 421         process = Process.by_id(self.conn, id_)
 422         return {'process': process}
 423
 424     def do_GET_processes(self) -> dict[str, object]:
 425         """Show all Processes."""
 426         pattern = self._params.get_str('pattern')
 427         processes = Process.matching(self.conn, pattern)
 428         sort_by = self._params.get_str('sort_by')
 429         if sort_by == 'steps':
 430             processes.sort(key=lambda p: len(p.explicit_steps))
 431         elif sort_by == '-steps':
 432             processes.sort(key=lambda p: len(p.explicit_steps), reverse=True)
 433         elif sort_by == 'owners':
 434             processes.sort(key=lambda p: p.n_owners or 0)
 435         elif sort_by == '-owners':
 436             processes.sort(key=lambda p: p.n_owners or 0, reverse=True)
 437         elif sort_by == 'effort':
 438             processes.sort(key=lambda p: p.effort.newest)
 439         elif sort_by == '-effort':
 440             processes.sort(key=lambda p: p.effort.newest, reverse=True)
 441         elif sort_by == '-title':
 442             processes.sort(key=lambda p: p.title.newest, reverse=True)
 443         else:
 444             processes.sort(key=lambda p: p.title.newest)
 445         return {'processes': processes, 'sort_by': sort_by, 'pattern': pattern}
 446
 447     # POST handlers
 448
 449     def _change_versioned_timestamps(self, cls: Any, attr_name: str) -> str:
 450         """Update history timestamps for VersionedAttribute."""
 451         id_ = self._params.get_int_or_none('id')
 452         item = cls.by_id(self.conn, id_)
 453         attr = getattr(item, attr_name)
 454         for k, v in self._form_data.get_first_strings_starting('at:').items():
 455             old = k[3:]
 456             if old[19:] != v:
 457                 attr.reset_timestamp(old, f'{v}.0')
 458         attr.save(self.conn)
 459         cls_name = cls.__name__.lower()
 460         return f'/{cls_name}_{attr_name}s?id={item.id_}'
 461
 462     def do_POST_day(self) -> str:
 463         """Update or insert Day of date and Todos mapped to it."""
 464         date = self._params.get_str('date')
 465         day = Day.by_id(self.conn, date, create=True)
 466         day.comment = self._form_data.get_str('day_comment')
 467         day.save(self.conn)
 468         make_type = self._form_data.get_str('make_type')
 469         for process_id in sorted(self._form_data.get_all_int('new_todo')):
 470             if 'empty' == make_type:
 471                 process = Process.by_id(self.conn, process_id)
 472                 todo = Todo(None, process, False, date)
 473                 todo.save(self.conn)
 474             else:
 475                 Todo.create_with_children(self.conn, process_id, date)
 476         done_ids = self._form_data.get_all_int('done')
 477         comments = self._form_data.get_all_str('comment')
 478         efforts = self._form_data.get_all_str('effort')
 479         for i, todo_id in enumerate(self._form_data.get_all_int('todo_id')):
 480             todo = Todo.by_id(self.conn, todo_id)
 481             todo.is_done = todo_id in done_ids
 482             if len(comments) > 0:
 483                 todo.comment = comments[i]
 484             if len(efforts) > 0:
 485                 todo.effort = float(efforts[i]) if efforts[i] else None
 486             todo.save(self.conn)
 487         return f'/day?date={date}&make_type={make_type}'
 488
 489     def do_POST_todo(self) -> str:
 490         """Update Todo and its children."""
 491         # pylint: disable=too-many-locals
 492         # pylint: disable=too-many-branches
 493         id_ = self._params.get_int('id')
 494         for _ in self._form_data.get_all_str('delete'):
 495             todo = Todo .by_id(self.conn, id_)
 496             todo.remove(self.conn)
 497             return '/'
 498         todo = Todo.by_id(self.conn, id_)
 499         adopted_child_ids = self._form_data.get_all_int('adopt')
 500         processes_to_make_full = self._form_data.get_all_int('make_full')
 501         processes_to_make_empty = self._form_data.get_all_int('make_empty')
 502         fill_fors = self._form_data.get_first_strings_starting('fill_for_')
 503         for v in fill_fors.values():
 504             if v.startswith('make_empty_'):
 505                 processes_to_make_empty += [int(v[11:])]
 506             elif v.startswith('make_full_'):
 507                 processes_to_make_full += [int(v[10:])]
 508             elif v != 'ignore':
 509                 adopted_child_ids += [int(v)]
 510         to_remove = []
 511         for child in todo.children:
 512             assert isinstance(child.id_, int)
 513             if child.id_ not in adopted_child_ids:
 514                 to_remove += [child.id_]
 515         for id_ in to_remove:
 516             child = Todo.by_id(self.conn, id_)
 517             todo.remove_child(child)
 518         for child_id in adopted_child_ids:
 519             if child_id in [c.id_ for c in todo.children]:
 520                 continue
 521             child = Todo.by_id(self.conn, child_id)
 522             todo.add_child(child)
 523         for process_id in processes_to_make_empty:
 524             process = Process.by_id(self.conn, process_id)
 525             made = Todo(None, process, False, todo.date)
 526             made.save(self.conn)
 527             todo.add_child(made)
 528         for process_id in processes_to_make_full:
 529             made = Todo.create_with_children(self.conn, process_id, todo.date)
 530             todo.add_child(made)
 531         effort = self._form_data.get_str('effort', ignore_strict=True)
 532         todo.effort = float(effort) if effort else None
 533         todo.set_conditions(self.conn,
 534                             self._form_data.get_all_int('condition'))
 535         todo.set_blockers(self.conn, self._form_data.get_all_int('blocker'))
 536         todo.set_enables(self.conn, self._form_data.get_all_int('enables'))
 537         todo.set_disables(self.conn, self._form_data.get_all_int('disables'))
 538         todo.is_done = len(self._form_data.get_all_str('done')) > 0
 539         todo.calendarize = len(self._form_data.get_all_str('calendarize')) > 0
 540         todo.comment = self._form_data.get_str('comment', ignore_strict=True)
 541         todo.save(self.conn)
 542         return f'/todo?id={todo.id_}'
 543
 544     def do_POST_process_descriptions(self) -> str:
 545         """Update history timestamps for Process.description."""
 546         return self._change_versioned_timestamps(Process, 'description')
 547
 548     def do_POST_process_efforts(self) -> str:
 549         """Update history timestamps for Process.effort."""
 550         return self._change_versioned_timestamps(Process, 'effort')
 551
 552     def do_POST_process_titles(self) -> str:
 553         """Update history timestamps for Process.title."""
 554         return self._change_versioned_timestamps(Process, 'title')
 555
 556     def do_POST_process(self) -> str:
 557         """Update or insert Process of ?id= and fields defined in postvars."""
 558         # pylint: disable=too-many-branches
 559         id_ = self._params.get_int_or_none('id')
 560         for _ in self._form_data.get_all_str('delete'):
 561             process = Process.by_id(self.conn, id_)
 562             process.remove(self.conn)
 563             return '/processes'
 564         process = Process.by_id(self.conn, id_, create=True)
 565         process.title.set(self._form_data.get_str('title'))
 566         process.description.set(self._form_data.get_str('description'))
 567         process.effort.set(self._form_data.get_float('effort'))
 568         process.set_conditions(self.conn,
 569                                self._form_data.get_all_int('condition'))
 570         process.set_blockers(self.conn, self._form_data.get_all_int('blocker'))
 571         process.set_enables(self.conn, self._form_data.get_all_int('enables'))
 572         process.set_disables(self.conn,
 573                              self._form_data.get_all_int('disables'))
 574         process.calendarize = self._form_data.get_all_str('calendarize') != []
 575         process.save(self.conn)
 576         assert isinstance(process.id_, int)
 577         steps: list[ProcessStep] = []
 578         for step_id in self._form_data.get_all_int('keep_step'):
 579             if step_id not in self._form_data.get_all_int('steps'):
 580                 raise BadFormatException('trying to keep unknown step')
 581         for step_id in self._form_data.get_all_int('steps'):
 582             if step_id not in self._form_data.get_all_int('keep_step'):
 583                 continue
 584             step_process_id = self._form_data.get_int(
 585                     f'step_{step_id}_process_id')
 586             parent_id = self._form_data.get_int_or_none(
 587                     f'step_{step_id}_parent_id')
 588             steps += [ProcessStep(step_id, process.id_, step_process_id,
 589                                   parent_id)]
 590         for step_id in self._form_data.get_all_int('steps'):
 591             for step_process_id in self._form_data.get_all_int(
 592                     f'new_step_to_{step_id}'):
 593                 steps += [ProcessStep(None, process.id_, step_process_id,
 594                                       step_id)]
 595         new_step_title = None
 596         for step_identifier in self._form_data.get_all_str('new_top_step'):
 597             try:
 598                 step_process_id = int(step_identifier)
 599                 steps += [ProcessStep(None, process.id_, step_process_id,
 600                                       None)]
 601             except ValueError:
 602                 new_step_title = step_identifier
 603         process.set_steps(self.conn, steps)
 604         process.set_step_suppressions(self.conn,
 605                                       self._form_data.
 606                                       get_all_int('suppresses'))
 607         owners_to_set = []
 608         new_owner_title = None
 609         for owner_identifier in self._form_data.get_all_str('step_of'):
 610             try:
 611                 owners_to_set += [int(owner_identifier)]
 612             except ValueError:
 613                 new_owner_title = owner_identifier
 614         process.set_owners(self.conn, owners_to_set)
 615         params = f'id={process.id_}'
 616         if new_step_title:
 617             title_b64_encoded = b64encode(new_step_title.encode()).decode()
 618             params = f'step_to={process.id_}&title_b64={title_b64_encoded}'
 619         elif new_owner_title:
 620             title_b64_encoded = b64encode(new_owner_title.encode()).decode()
 621             params = f'has_step={process.id_}&title_b64={title_b64_encoded}'
 622         process.save(self.conn)
 623         return f'/process?{params}'
 624
 625     def do_POST_condition_descriptions(self) -> str:
 626         """Update history timestamps for Condition.description."""
 627         return self._change_versioned_timestamps(Condition, 'description')
 628
 629     def do_POST_condition_titles(self) -> str:
 630         """Update history timestamps for Condition.title."""
 631         return self._change_versioned_timestamps(Condition, 'title')
 632
 633     def do_POST_condition(self) -> str:
 634         """Update/insert Condition of ?id= and fields defined in postvars."""
 635         id_ = self._params.get_int_or_none('id')
 636         for _ in self._form_data.get_all_str('delete'):
 637             condition = Condition.by_id(self.conn, id_)
 638             condition.remove(self.conn)
 639             return '/conditions'
 640         condition = Condition.by_id(self.conn, id_, create=True)
 641         condition.is_active = self._form_data.get_all_str('is_active') != []
 642         condition.title.set(self._form_data.get_str('title'))
 643         condition.description.set(self._form_data.get_str('description'))
 644         condition.save(self.conn)
 645         return f'/condition?id={condition.id_}'