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