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