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
   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 @dataclass
  24 class TodoStepsNode:
  25     """Collect what's useful for Todo steps tree display."""
  26     id_: int
  27     todo: Todo | None
  28     process: Process | None
  29     children: list[TodoStepsNode]
  30     fillable: bool = False
  31
  32
  33 class TaskServer(HTTPServer):
  34     """Variant of HTTPServer that knows .jinja as Jinja Environment."""
  35
  36     def __init__(self, db_file: DatabaseFile,
  37                  *args: Any, **kwargs: Any) -> None:
  38         super().__init__(*args, **kwargs)
  39         self.db = db_file
  40         self.jinja = JinjaEnv(loader=JinjaFSLoader(TEMPLATES_DIR))
  41
  42
  43 class InputsParser:
  44     """Wrapper for validating and retrieving dict-like HTTP inputs."""
  45
  46     def __init__(self, dict_: dict[str, list[str]],
  47                  strictness: bool = True) -> None:
  48         self.inputs = dict_
  49         self.strict = strictness
  50
  51     def get_str(self, key: str, default: str = '',
  52                 ignore_strict: bool = False) -> str:
  53         """Retrieve single/first string value of key, or default."""
  54         if key not in self.inputs.keys() or 0 == len(self.inputs[key]):
  55             if self.strict and not ignore_strict:
  56                 raise BadFormatException(f'no value found for key {key}')
  57             return default
  58         return self.inputs[key][0]
  59
  60     def get_first_strings_starting(self, prefix: str) -> dict[str, str]:
  61         """Retrieve dict of (first) strings at key starting with prefix."""
  62         ret = {}
  63         for key in [k for k in self.inputs.keys() if k.startswith(prefix)]:
  64             ret[key] = self.inputs[key][0]
  65         return ret
  66
  67     def get_int(self, key: str) -> int:
  68         """Retrieve single/first value of key as int, error if empty."""
  69         val = self.get_int_or_none(key)
  70         if val is None:
  71             raise BadFormatException(f'unexpected empty value for: {key}')
  72         return val
  73
  74     def get_int_or_none(self, key: str) -> int | None:
  75         """Retrieve single/first value of key as int, return None if empty."""
  76         val = self.get_str(key, ignore_strict=True)
  77         if val == '':
  78             return None
  79         try:
  80             return int(val)
  81         except ValueError as e:
  82             msg = f'cannot int form field value for key {key}: {val}'
  83             raise BadFormatException(msg) from e
  84
  85     def get_float(self, key: str) -> float:
  86         """Retrieve float value of key from self.postvars."""
  87         val = self.get_str(key)
  88         try:
  89             return float(val)
  90         except ValueError as e:
  91             msg = f'cannot float form field value for key {key}: {val}'
  92             raise BadFormatException(msg) from e
  93
  94     def get_all_str(self, key: str) -> list[str]:
  95         """Retrieve list of string values at key."""
  96         if key not in self.inputs.keys():
  97             return []
  98         return self.inputs[key]
  99
 100     def get_all_int(self, key: str) -> list[int]:
 101         """Retrieve list of int values at key."""
 102         all_str = self.get_all_str(key)
 103         try:
 104             return [int(s) for s in all_str if len(s) > 0]
 105         except ValueError as e:
 106             msg = f'cannot int a form field value for key {key} in: {all_str}'
 107             raise BadFormatException(msg) from e
 108
 109
 110 class TaskHandler(BaseHTTPRequestHandler):
 111     """Handles single HTTP request."""
 112     # pylint: disable=too-many-public-methods
 113     server: TaskServer
 114     conn: DatabaseConnection
 115     _site: str
 116     _form_data: InputsParser
 117     _params: InputsParser
 118
 119     def do_GET(self) -> None:
 120         """Handle any GET request."""
 121         try:
 122             self._init_handling()
 123             if hasattr(self, f'do_GET_{self._site}'):
 124                 template = f'{self._site}.html'
 125                 ctx = getattr(self, f'do_GET_{self._site}')()
 126                 html = self.server.jinja.get_template(template).render(**ctx)
 127                 self._send_html(html)
 128             elif '' == self._site:
 129                 self._redirect('/day')
 130             else:
 131                 raise NotFoundException(f'Unknown page: /{self._site}')
 132         except HandledException as error:
 133             self._send_msg(error, code=error.http_code)
 134         finally:
 135             self.conn.close()
 136
 137     def _do_GET_calendar(self) -> dict[str, object]:
 138         """Show Days from ?start= to ?end=."""
 139         start = self._params.get_str('start')
 140         end = self._params.get_str('end')
 141         if not end:
 142             end = date_in_n_days(366)
 143         ret = Day.by_date_range_with_limits(self.conn, (start, end), 'id')
 144         days, start, end = ret
 145         days = Day.with_filled_gaps(days, start, end)
 146         for day in days:
 147             day.collect_calendarized_todos(self.conn)
 148         today = date_in_n_days(0)
 149         return {'start': start, 'end': end, 'days': days, 'today': today}
 150
 151     def do_GET_calendar(self) -> dict[str, object]:
 152         """Show Days from ?start= to ?end= – normal view."""
 153         return self._do_GET_calendar()
 154
 155     def do_GET_calendar_txt(self) -> dict[str, object]:
 156         """Show Days from ?start= to ?end= – minimalist view."""
 157         return self._do_GET_calendar()
 158
 159     def do_GET_day(self) -> dict[str, object]:
 160         """Show single Day of ?date=."""
 161         date = self._params.get_str('date', date_in_n_days(0))
 162         make_type = self._params.get_str('make_type')
 163         todays_todos = Todo.by_date(self.conn, date)
 164         total_effort = 0.0
 165         for todo in todays_todos:
 166             total_effort += todo.performed_effort
 167         conditions_present = []
 168         enablers_for = {}
 169         disablers_for = {}
 170         for todo in todays_todos:
 171             for condition in todo.conditions + todo.blockers:
 172                 if condition not in conditions_present:
 173                     conditions_present += [condition]
 174                     enablers_for[condition.id_] = [p for p in
 175                                                    Process.all(self.conn)
 176                                                    if condition in p.enables]
 177                     disablers_for[condition.id_] = [p for p in
 178                                                     Process.all(self.conn)
 179                                                     if condition in p.disables]
 180         seen_todos: set[int] = set()
 181         top_nodes = [t.get_step_tree(seen_todos)
 182                      for t in todays_todos if not t.parents]
 183         return {'day': Day.by_id(self.conn, date, create=True),
 184                 'total_effort': total_effort,
 185                 'top_nodes': top_nodes,
 186                 'make_type': make_type,
 187                 'enablers_for': enablers_for,
 188                 'disablers_for': disablers_for,
 189                 'conditions_present': conditions_present,
 190                 'processes': Process.all(self.conn)}
 191
 192     def do_GET_todo(self) -> dict[str, object]:
 193         """Show single Todo of ?id=."""
 194
 195         def walk_process_steps(id_: int,
 196                                process_step_nodes: list[ProcessStepsNode],
 197                                steps_nodes: list[TodoStepsNode]) -> None:
 198             for process_step_node in process_step_nodes:
 199                 id_ += 1
 200                 node = TodoStepsNode(id_, None, process_step_node.process, [])
 201                 steps_nodes += [node]
 202                 walk_process_steps(id_, list(process_step_node.steps.values()),
 203                                    node.children)
 204
 205         def walk_todo_steps(id_: int, todos: list[Todo],
 206                             steps_nodes: list[TodoStepsNode]) -> None:
 207             for todo in todos:
 208                 matched = False
 209                 for match in [item for item in steps_nodes
 210                               if item.process
 211                               and item.process == todo.process]:
 212                     match.todo = todo
 213                     matched = True
 214                     for child in match.children:
 215                         child.fillable = True
 216                     walk_todo_steps(id_, todo.children, match.children)
 217                 if not matched:
 218                     id_ += 1
 219                     node = TodoStepsNode(id_, todo, None, [])
 220                     steps_nodes += [node]
 221                     walk_todo_steps(id_, todo.children, node.children)
 222
 223         def collect_adoptables_keys(steps_nodes: list[TodoStepsNode]
 224                                     ) -> set[int]:
 225             ids = set()
 226             for node in steps_nodes:
 227                 if not node.todo:
 228                     assert isinstance(node.process, Process)
 229                     assert isinstance(node.process.id_, int)
 230                     ids.add(node.process.id_)
 231                 ids = ids | collect_adoptables_keys(node.children)
 232             return ids
 233
 234         id_ = self._params.get_int('id')
 235         todo = Todo.by_id(self.conn, id_)
 236         todo_steps = [step.todo for step in todo.get_step_tree(set()).children]
 237         process_tree = todo.process.get_steps(self.conn, None)
 238         steps_todo_to_process: list[TodoStepsNode] = []
 239         walk_process_steps(0, list(process_tree.values()),
 240                            steps_todo_to_process)
 241         for steps_node in steps_todo_to_process:
 242             steps_node.fillable = True
 243         walk_todo_steps(len(steps_todo_to_process), todo_steps,
 244                         steps_todo_to_process)
 245         adoptables: dict[int, list[Todo]] = {}
 246         any_adoptables = [Todo.by_id(self.conn, t.id_)
 247                           for t in Todo.by_date(self.conn, todo.date)
 248                           if t != todo]
 249         for id_ in collect_adoptables_keys(steps_todo_to_process):
 250             adoptables[id_] = [t for t in any_adoptables
 251                                if t.process.id_ == id_]
 252         return {'todo': todo, 'steps_todo_to_process': steps_todo_to_process,
 253                 'adoption_candidates_for': adoptables,
 254                 'process_candidates': Process.all(self.conn),
 255                 'todo_candidates': any_adoptables,
 256                 'condition_candidates': Condition.all(self.conn)}
 257
 258     def do_GET_todos(self) -> dict[str, object]:
 259         """Show Todos from ?start= to ?end=, of ?process=, ?comment= pattern"""
 260         sort_by = self._params.get_str('sort_by')
 261         start = self._params.get_str('start')
 262         end = self._params.get_str('end')
 263         process_id = self._params.get_int_or_none('process_id')
 264         comment_pattern = self._params.get_str('comment_pattern')
 265         todos = []
 266         ret = Todo.by_date_range_with_limits(self.conn, (start, end))
 267         todos_by_date_range, start, end = ret
 268         todos = [t for t in todos_by_date_range
 269                  if comment_pattern in t.comment
 270                  and ((not process_id) or t.process.id_ == process_id)]
 271         if sort_by == 'doneness':
 272             todos.sort(key=lambda t: t.is_done)
 273         elif sort_by == '-doneness':
 274             todos.sort(key=lambda t: t.is_done, reverse=True)
 275         elif sort_by == 'title':
 276             todos.sort(key=lambda t: t.title_then)
 277         elif sort_by == '-title':
 278             todos.sort(key=lambda t: t.title_then, reverse=True)
 279         elif sort_by == 'comment':
 280             todos.sort(key=lambda t: t.comment)
 281         elif sort_by == '-comment':
 282             todos.sort(key=lambda t: t.comment, reverse=True)
 283         elif sort_by == '-date':
 284             todos.sort(key=lambda t: t.date, reverse=True)
 285         else:
 286             todos.sort(key=lambda t: t.date)
 287         return {'start': start, 'end': end, 'process_id': process_id,
 288                 'comment_pattern': comment_pattern, 'todos': todos,
 289                 'all_processes': Process.all(self.conn), 'sort_by': sort_by}
 290
 291     def do_GET_conditions(self) -> dict[str, object]:
 292         """Show all Conditions."""
 293         pattern = self._params.get_str('pattern')
 294         conditions = Condition.matching(self.conn, pattern)
 295         sort_by = self._params.get_str('sort_by')
 296         if sort_by == 'is_active':
 297             conditions.sort(key=lambda c: c.is_active)
 298         elif sort_by == '-is_active':
 299             conditions.sort(key=lambda c: c.is_active, reverse=True)
 300         elif sort_by == '-title':
 301             conditions.sort(key=lambda c: c.title.newest, reverse=True)
 302         else:
 303             conditions.sort(key=lambda c: c.title.newest)
 304         return {'conditions': conditions,
 305                 'sort_by': sort_by,
 306                 'pattern': pattern}
 307
 308     def do_GET_condition(self) -> dict[str, object]:
 309         """Show Condition of ?id=."""
 310         id_ = self._params.get_int_or_none('id')
 311         c = Condition.by_id(self.conn, id_, create=True)
 312         ps = Process.all(self.conn)
 313         return {'condition': c, 'is_new': c.id_ is None,
 314                 'enabled_processes': [p for p in ps if c in p.conditions],
 315                 'disabled_processes': [p for p in ps if c in p.blockers],
 316                 'enabling_processes': [p for p in ps if c in p.enables],
 317                 'disabling_processes': [p for p in ps if c in p.disables]}
 318
 319     def do_GET_condition_titles(self) -> dict[str, object]:
 320         """Show title history of Condition of ?id=."""
 321         id_ = self._params.get_int_or_none('id')
 322         condition = Condition.by_id(self.conn, id_)
 323         return {'condition': condition}
 324
 325     def do_GET_condition_descriptions(self) -> dict[str, object]:
 326         """Show description historys of Condition of ?id=."""
 327         id_ = self._params.get_int_or_none('id')
 328         condition = Condition.by_id(self.conn, id_)
 329         return {'condition': condition}
 330
 331     def do_GET_process(self) -> dict[str, object]:
 332         """Show Process of ?id=."""
 333         id_ = self._params.get_int_or_none('id')
 334         process = Process.by_id(self.conn, id_, create=True)
 335         title_64 = self._params.get_str('title_b64')
 336         if title_64:
 337             title = b64decode(title_64.encode()).decode()
 338             process.title.set(title)
 339         owners = process.used_as_step_by(self.conn)
 340         for step_id in self._params.get_all_int('step_to'):
 341             owners += [Process.by_id(self.conn, step_id)]
 342         preset_top_step = None
 343         for process_id in self._params.get_all_int('has_step'):
 344             preset_top_step = process_id
 345         return {'process': process, 'is_new': process.id_ is None,
 346                 'preset_top_step': preset_top_step,
 347                 'steps': process.get_steps(self.conn), 'owners': owners,
 348                 'n_todos': len(Todo.by_process_id(self.conn, process.id_)),
 349                 'process_candidates': Process.all(self.conn),
 350                 'condition_candidates': Condition.all(self.conn)}
 351
 352     def do_GET_process_titles(self) -> dict[str, object]:
 353         """Show title history of Process of ?id=."""
 354         id_ = self._params.get_int_or_none('id')
 355         process = Process.by_id(self.conn, id_)
 356         return {'process': process}
 357
 358     def do_GET_process_descriptions(self) -> dict[str, object]:
 359         """Show description historys of Process of ?id=."""
 360         id_ = self._params.get_int_or_none('id')
 361         process = Process.by_id(self.conn, id_)
 362         return {'process': process}
 363
 364     def do_GET_process_efforts(self) -> dict[str, object]:
 365         """Show default effort history of Process of ?id=."""
 366         id_ = self._params.get_int_or_none('id')
 367         process = Process.by_id(self.conn, id_)
 368         return {'process': process}
 369
 370     def do_GET_processes(self) -> dict[str, object]:
 371         """Show all Processes."""
 372         pattern = self._params.get_str('pattern')
 373         processes = Process.matching(self.conn, pattern)
 374         sort_by = self._params.get_str('sort_by')
 375         if sort_by == 'steps':
 376             processes.sort(key=lambda p: len(p.explicit_steps))
 377         elif sort_by == '-steps':
 378             processes.sort(key=lambda p: len(p.explicit_steps), reverse=True)
 379         elif sort_by == 'owners':
 380             processes.sort(key=lambda p: p.n_owners or 0)
 381         elif sort_by == '-owners':
 382             processes.sort(key=lambda p: p.n_owners or 0, reverse=True)
 383         elif sort_by == 'effort':
 384             processes.sort(key=lambda p: p.effort.newest)
 385         elif sort_by == '-effort':
 386             processes.sort(key=lambda p: p.effort.newest, reverse=True)
 387         elif sort_by == '-title':
 388             processes.sort(key=lambda p: p.title.newest, reverse=True)
 389         else:
 390             processes.sort(key=lambda p: p.title.newest)
 391         return {'processes': processes, 'sort_by': sort_by, 'pattern': pattern}
 392
 393     def do_POST(self) -> None:
 394         """Handle any POST request."""
 395         try:
 396             self._init_handling()
 397             length = int(self.headers['content-length'])
 398             postvars = parse_qs(self.rfile.read(length).decode(),
 399                                 keep_blank_values=True, strict_parsing=True)
 400             self._form_data = InputsParser(postvars)
 401             if hasattr(self, f'do_POST_{self._site}'):
 402                 redir_target = getattr(self, f'do_POST_{self._site}')()
 403                 self.conn.commit()
 404             else:
 405                 msg = f'Page not known as POST target: /{self._site}'
 406                 raise NotFoundException(msg)
 407             self._redirect(redir_target)
 408         except HandledException as error:
 409             self._send_msg(error, code=error.http_code)
 410         finally:
 411             self.conn.close()
 412
 413     def do_POST_day(self) -> str:
 414         """Update or insert Day of date and Todos mapped to it."""
 415         date = self._params.get_str('date')
 416         day = Day.by_id(self.conn, date, create=True)
 417         day.comment = self._form_data.get_str('day_comment')
 418         day.save(self.conn)
 419         make_type = self._form_data.get_str('make_type')
 420         for process_id in sorted(self._form_data.get_all_int('new_todo')):
 421             if 'empty' == make_type:
 422                 process = Process.by_id(self.conn, process_id)
 423                 todo = Todo(None, process, False, date)
 424                 todo.save(self.conn)
 425             else:
 426                 Todo.create_with_children(self.conn, process_id, date)
 427         done_ids = self._form_data.get_all_int('done')
 428         comments = self._form_data.get_all_str('comment')
 429         efforts = self._form_data.get_all_str('effort')
 430         for i, todo_id in enumerate(self._form_data.get_all_int('todo_id')):
 431             todo = Todo.by_id(self.conn, todo_id)
 432             todo.is_done = todo_id in done_ids
 433             if len(comments) > 0:
 434                 todo.comment = comments[i]
 435             if len(efforts) > 0:
 436                 todo.effort = float(efforts[i]) if efforts[i] else None
 437             todo.save(self.conn)
 438             for condition in todo.enables:
 439                 condition.save(self.conn)
 440             for condition in todo.disables:
 441                 condition.save(self.conn)
 442         return f'/day?date={date}&make_type={make_type}'
 443
 444     def do_POST_todo(self) -> str:
 445         """Update Todo and its children."""
 446         # pylint: disable=too-many-locals
 447         # pylint: disable=too-many-branches
 448         id_ = self._params.get_int('id')
 449         for _ in self._form_data.get_all_str('delete'):
 450             todo = Todo .by_id(self.conn, id_)
 451             todo.remove(self.conn)
 452             return '/'
 453         todo = Todo.by_id(self.conn, id_)
 454         adopted_child_ids = self._form_data.get_all_int('adopt')
 455         processes_to_make_full = self._form_data.get_all_int('make_full')
 456         processes_to_make_empty = self._form_data.get_all_int('make_empty')
 457         fill_fors = self._form_data.get_first_strings_starting('fill_for_')
 458         for v in fill_fors.values():
 459             if v.startswith('make_empty_'):
 460                 processes_to_make_empty += [int(v[11:])]
 461             elif v.startswith('make_full_'):
 462                 processes_to_make_full += [int(v[10:])]
 463             elif v != 'ignore':
 464                 adopted_child_ids += [int(v)]
 465         to_remove = []
 466         for child in todo.children:
 467             assert isinstance(child.id_, int)
 468             if child.id_ not in adopted_child_ids:
 469                 to_remove += [child.id_]
 470         for id_ in to_remove:
 471             child = Todo.by_id(self.conn, id_)
 472             todo.remove_child(child)
 473         for child_id in adopted_child_ids:
 474             if child_id in [c.id_ for c in todo.children]:
 475                 continue
 476             child = Todo.by_id(self.conn, child_id)
 477             todo.add_child(child)
 478         for process_id in processes_to_make_empty:
 479             process = Process.by_id(self.conn, process_id)
 480             made = Todo(None, process, False, todo.date)
 481             made.save(self.conn)
 482             todo.add_child(made)
 483         for process_id in processes_to_make_full:
 484             made = Todo.create_with_children(self.conn, process_id, todo.date)
 485             todo.add_child(made)
 486         effort = self._form_data.get_str('effort', ignore_strict=True)
 487         todo.effort = float(effort) if effort else None
 488         todo.set_conditions(self.conn,
 489                             self._form_data.get_all_int('condition'))
 490         todo.set_blockers(self.conn, self._form_data.get_all_int('blocker'))
 491         todo.set_enables(self.conn, self._form_data.get_all_int('enables'))
 492         todo.set_disables(self.conn, self._form_data.get_all_int('disables'))
 493         todo.is_done = len(self._form_data.get_all_str('done')) > 0
 494         todo.calendarize = len(self._form_data.get_all_str('calendarize')) > 0
 495         todo.comment = self._form_data.get_str('comment', ignore_strict=True)
 496         todo.save(self.conn)
 497         for condition in todo.enables:
 498             condition.save(self.conn)
 499         for condition in todo.disables:
 500             condition.save(self.conn)
 501         return f'/todo?id={todo.id_}'
 502
 503     def _do_POST_versioned_timestamps(self, cls: Any, attr_name: str) -> str:
 504         """Update history timestamps for VersionedAttribute."""
 505         id_ = self._params.get_int_or_none('id')
 506         item = cls.by_id(self.conn, id_)
 507         attr = getattr(item, attr_name)
 508         for k, v in self._form_data.get_first_strings_starting('at:').items():
 509             old = k[3:]
 510             if old[19:] != v:
 511                 attr.reset_timestamp(old, f'{v}.0')
 512         attr.save(self.conn)
 513         cls_name = cls.__name__.lower()
 514         return f'/{cls_name}_{attr_name}s?id={item.id_}'
 515
 516     def do_POST_process_descriptions(self) -> str:
 517         """Update history timestamps for Process.description."""
 518         return self._do_POST_versioned_timestamps(Process, 'description')
 519
 520     def do_POST_process_efforts(self) -> str:
 521         """Update history timestamps for Process.effort."""
 522         return self._do_POST_versioned_timestamps(Process, 'effort')
 523
 524     def do_POST_process_titles(self) -> str:
 525         """Update history timestamps for Process.title."""
 526         return self._do_POST_versioned_timestamps(Process, 'title')
 527
 528     def do_POST_process(self) -> str:
 529         """Update or insert Process of ?id= and fields defined in postvars."""
 530         # pylint: disable=too-many-branches
 531         id_ = self._params.get_int_or_none('id')
 532         for _ in self._form_data.get_all_str('delete'):
 533             process = Process.by_id(self.conn, id_)
 534             process.remove(self.conn)
 535             return '/processes'
 536         process = Process.by_id(self.conn, id_, create=True)
 537         process.title.set(self._form_data.get_str('title'))
 538         process.description.set(self._form_data.get_str('description'))
 539         process.effort.set(self._form_data.get_float('effort'))
 540         process.set_conditions(self.conn,
 541                                self._form_data.get_all_int('condition'))
 542         process.set_blockers(self.conn, self._form_data.get_all_int('blocker'))
 543         process.set_enables(self.conn, self._form_data.get_all_int('enables'))
 544         process.set_disables(self.conn,
 545                              self._form_data.get_all_int('disables'))
 546         process.calendarize = self._form_data.get_all_str('calendarize') != []
 547         process.save(self.conn)
 548         assert isinstance(process.id_, int)
 549         steps: list[ProcessStep] = []
 550         for step_id in self._form_data.get_all_int('keep_step'):
 551             if step_id not in self._form_data.get_all_int('steps'):
 552                 raise BadFormatException('trying to keep unknown step')
 553         for step_id in self._form_data.get_all_int('steps'):
 554             if step_id not in self._form_data.get_all_int('keep_step'):
 555                 continue
 556             step_process_id = self._form_data.get_int(
 557                     f'step_{step_id}_process_id')
 558             parent_id = self._form_data.get_int_or_none(
 559                     f'step_{step_id}_parent_id')
 560             steps += [ProcessStep(step_id, process.id_, step_process_id,
 561                                   parent_id)]
 562         for step_id in self._form_data.get_all_int('steps'):
 563             for step_process_id in self._form_data.get_all_int(
 564                     f'new_step_to_{step_id}'):
 565                 steps += [ProcessStep(None, process.id_, step_process_id,
 566                                       step_id)]
 567         new_step_title = None
 568         for step_identifier in self._form_data.get_all_str('new_top_step'):
 569             try:
 570                 step_process_id = int(step_identifier)
 571                 steps += [ProcessStep(None, process.id_, step_process_id,
 572                                       None)]
 573             except ValueError:
 574                 new_step_title = step_identifier
 575         process.uncache()
 576         process.set_steps(self.conn, steps)
 577         process.set_step_suppressions(self.conn,
 578                                       self._form_data.
 579                                       get_all_int('suppresses'))
 580         process.save(self.conn)
 581         owners_to_set = []
 582         new_owner_title = None
 583         for owner_identifier in self._form_data.get_all_str('step_of'):
 584             try:
 585                 owners_to_set += [int(owner_identifier)]
 586             except ValueError:
 587                 new_owner_title = owner_identifier
 588         process.set_owners(self.conn, owners_to_set)
 589         params = f'id={process.id_}'
 590         if new_step_title:
 591             title_b64_encoded = b64encode(new_step_title.encode()).decode()
 592             params = f'step_to={process.id_}&title_b64={title_b64_encoded}'
 593         elif new_owner_title:
 594             title_b64_encoded = b64encode(new_owner_title.encode()).decode()
 595             params = f'has_step={process.id_}&title_b64={title_b64_encoded}'
 596         return f'/process?{params}'
 597
 598     def do_POST_condition_descriptions(self) -> str:
 599         """Update history timestamps for Condition.description."""
 600         return self._do_POST_versioned_timestamps(Condition, 'description')
 601
 602     def do_POST_condition_titles(self) -> str:
 603         """Update history timestamps for Condition.title."""
 604         return self._do_POST_versioned_timestamps(Condition, 'title')
 605
 606     def do_POST_condition(self) -> str:
 607         """Update/insert Condition of ?id= and fields defined in postvars."""
 608         id_ = self._params.get_int_or_none('id')
 609         for _ in self._form_data.get_all_str('delete'):
 610             condition = Condition.by_id(self.conn, id_)
 611             condition.remove(self.conn)
 612             return '/conditions'
 613         condition = Condition.by_id(self.conn, id_, create=True)
 614         condition.is_active = self._form_data.get_all_str('is_active') != []
 615         condition.title.set(self._form_data.get_str('title'))
 616         condition.description.set(self._form_data.get_str('description'))
 617         condition.save(self.conn)
 618         return f'/condition?id={condition.id_}'
 619
 620     def _init_handling(self) -> None:
 621         """Our own __init__, as we're not supposed to use the original."""
 622         self.conn = DatabaseConnection(self.server.db)
 623         parsed_url = urlparse(self.path)
 624         self._site = path_split(parsed_url.path)[1]
 625         params = parse_qs(parsed_url.query, strict_parsing=True)
 626         self._params = InputsParser(params, False)
 627
 628     def _redirect(self, target: str) -> None:
 629         """Redirect to target."""
 630         self.send_response(302)
 631         self.send_header('Location', target)
 632         self.end_headers()
 633
 634     def _send_html(self, html: str, code: int = 200) -> None:
 635         """Send HTML as proper HTTP response."""
 636         self.send_response(code)
 637         self.end_headers()
 638         self.wfile.write(bytes(html, 'utf-8'))
 639
 640     def _send_msg(self, msg: Exception, code: int = 400) -> None:
 641         """Send message in HTML formatting as HTTP response."""
 642         html = self.server.jinja.get_template('msg.html').render(msg=msg)
 643         self._send_html(html, code)