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[plomtask] / 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         todays_todos = Todo.by_date(self.conn, date)
159         total_effort = 0.0
160         for todo in todays_todos:
161             total_effort += todo.performed_effort
162         conditions_present = []
163         enablers_for = {}
164         disablers_for = {}
165         for todo in todays_todos:
166             for condition in todo.conditions + todo.blockers:
167                 if condition not in conditions_present:
168                     conditions_present += [condition]
169                     enablers_for[condition.id_] = [p for p in
170                                                    Process.all(self.conn)
171                                                    if condition in p.enables]
172                     disablers_for[condition.id_] = [p for p in
173                                                     Process.all(self.conn)
174                                                     if condition in p.disables]
175         seen_todos: set[int] = set()
176         top_nodes = [t.get_step_tree(seen_todos)
177                      for t in todays_todos if not t.parents]
178         return {'day': Day.by_id(self.conn, date, create=True),
179                 'total_effort': total_effort,
180                 'top_nodes': top_nodes,
181                 'enablers_for': enablers_for,
182                 'disablers_for': disablers_for,
183                 'conditions_present': conditions_present,
184                 'processes': Process.all(self.conn)}
185
186     def do_GET_todo(self) -> dict[str, object]:
187         """Show single Todo of ?id=."""
188
189         def walk_process_steps(id_: int,
190                                process_step_nodes: list[ProcessStepsNode],
191                                steps_nodes: list[TodoStepsNode]) -> None:
192             for process_step_node in process_step_nodes:
193                 id_ += 1
194                 node = TodoStepsNode(id_, None, process_step_node.process, [])
195                 steps_nodes += [node]
196                 walk_process_steps(id_, list(process_step_node.steps.values()),
197                                    node.children)
198
199         def walk_todo_steps(id_: int, todos: list[Todo],
200                             steps_nodes: list[TodoStepsNode]) -> None:
201             for todo in todos:
202                 matched = False
203                 for match in [item for item in steps_nodes
204                               if item.process
205                               and item.process == todo.process]:
206                     match.todo = todo
207                     matched = True
208                     for child in match.children:
209                         child.fillable = True
210                     walk_todo_steps(id_, todo.children, match.children)
211                 if not matched:
212                     id_ += 1
213                     node = TodoStepsNode(id_, todo, None, [])
214                     steps_nodes += [node]
215                     walk_todo_steps(id_, todo.children, node.children)
216
217         def collect_adoptables_keys(steps_nodes: list[TodoStepsNode]
218                                     ) -> set[int]:
219             ids = set()
220             for node in steps_nodes:
221                 if not node.todo:
222                     assert isinstance(node.process, Process)
223                     assert isinstance(node.process.id_, int)
224                     ids.add(node.process.id_)
225                 ids = ids | collect_adoptables_keys(node.children)
226             return ids
227
228         id_ = self.params.get_int('id')
229         todo = Todo.by_id(self.conn, id_)
230         todo_steps = [step.todo for step in todo.get_step_tree(set()).children]
231         process_tree = todo.process.get_steps(self.conn, None)
232         steps_todo_to_process: list[TodoStepsNode] = []
233         walk_process_steps(0, list(process_tree.values()),
234                            steps_todo_to_process)
235         for steps_node in steps_todo_to_process:
236             steps_node.fillable = True
237         walk_todo_steps(len(steps_todo_to_process), todo_steps,
238                         steps_todo_to_process)
239         adoptables: dict[int, list[Todo]] = {}
240         any_adoptables = [Todo.by_id(self.conn, t.id_)
241                           for t in Todo.by_date(self.conn, todo.date)
242                           if t != todo]
243         for id_ in collect_adoptables_keys(steps_todo_to_process):
244             adoptables[id_] = [t for t in any_adoptables
245                                if t.process.id_ == id_]
246         return {'todo': todo, 'steps_todo_to_process': steps_todo_to_process,
247                 'adoption_candidates_for': adoptables,
248                 'process_candidates': Process.all(self.conn),
249                 'todo_candidates': any_adoptables,
250                 'condition_candidates': Condition.all(self.conn)}
251
252     def do_GET_todos(self) -> dict[str, object]:
253         """Show Todos from ?start= to ?end=, of ?process=, ?comment= pattern"""
254         sort_by = self.params.get_str('sort_by')
255         start = self.params.get_str('start')
256         end = self.params.get_str('end')
257         process_id = self.params.get_int_or_none('process_id')
258         comment_pattern = self.params.get_str('comment_pattern')
259         todos = []
260         ret = Todo.by_date_range_with_limits(self.conn, (start, end))
261         todos_by_date_range, start, end = ret
262         todos = [t for t in todos_by_date_range
263                  if comment_pattern in t.comment
264                  and ((not process_id) or t.process.id_ == process_id)]
265         if sort_by == 'doneness':
266             todos.sort(key=lambda t: t.is_done)
267         elif sort_by == '-doneness':
268             todos.sort(key=lambda t: t.is_done, reverse=True)
269         elif sort_by == 'title':
270             todos.sort(key=lambda t: t.title_then)
271         elif sort_by == '-title':
272             todos.sort(key=lambda t: t.title_then, reverse=True)
273         elif sort_by == 'comment':
274             todos.sort(key=lambda t: t.comment)
275         elif sort_by == '-comment':
276             todos.sort(key=lambda t: t.comment, reverse=True)
277         elif sort_by == '-date':
278             todos.sort(key=lambda t: t.date, reverse=True)
279         else:
280             todos.sort(key=lambda t: t.date)
281         return {'start': start, 'end': end, 'process_id': process_id,
282                 'comment_pattern': comment_pattern, 'todos': todos,
283                 'all_processes': Process.all(self.conn), 'sort_by': sort_by}
284
285     def do_GET_conditions(self) -> dict[str, object]:
286         """Show all Conditions."""
287         pattern = self.params.get_str('pattern')
288         conditions = Condition.matching(self.conn, pattern)
289         sort_by = self.params.get_str('sort_by')
290         if sort_by == 'is_active':
291             conditions.sort(key=lambda c: c.is_active)
292         elif sort_by == '-is_active':
293             conditions.sort(key=lambda c: c.is_active, reverse=True)
294         elif sort_by == '-title':
295             conditions.sort(key=lambda c: c.title.newest, reverse=True)
296         else:
297             conditions.sort(key=lambda c: c.title.newest)
298         return {'conditions': conditions,
299                 'sort_by': sort_by,
300                 'pattern': pattern}
301
302     def do_GET_condition(self) -> dict[str, object]:
303         """Show Condition of ?id=."""
304         id_ = self.params.get_int_or_none('id')
305         c = Condition.by_id(self.conn, id_, create=True)
306         ps = Process.all(self.conn)
307         return {'condition': c, 'is_new': c.id_ is None,
308                 'enabled_processes': [p for p in ps if c in p.conditions],
309                 'disabled_processes': [p for p in ps if c in p.blockers],
310                 'enabling_processes': [p for p in ps if c in p.enables],
311                 'disabling_processes': [p for p in ps if c in p.disables]}
312
313     def do_GET_condition_titles(self) -> dict[str, object]:
314         """Show title history of Condition of ?id=."""
315         id_ = self.params.get_int_or_none('id')
316         condition = Condition.by_id(self.conn, id_)
317         return {'condition': condition}
318
319     def do_GET_condition_descriptions(self) -> dict[str, object]:
320         """Show description historys 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_process(self) -> dict[str, object]:
326         """Show Process of ?id=."""
327         id_ = self.params.get_int_or_none('id')
328         process = Process.by_id(self.conn, id_, create=True)
329         title_64 = self.params.get_str('title_b64')
330         if title_64:
331             title = b64decode(title_64.encode()).decode()
332             process.title.set(title)
333         owners = process.used_as_step_by(self.conn)
334         for step_id in self.params.get_all_int('step_to'):
335             owners += [Process.by_id(self.conn, step_id)]
336         preset_top_step = None
337         for process_id in self.params.get_all_int('has_step'):
338             preset_top_step = process_id
339         return {'process': process, 'is_new': process.id_ is None,
340                 'preset_top_step': preset_top_step,
341                 'steps': process.get_steps(self.conn), 'owners': owners,
342                 'n_todos': len(Todo.by_process_id(self.conn, process.id_)),
343                 'process_candidates': Process.all(self.conn),
344                 'condition_candidates': Condition.all(self.conn)}
345
346     def do_GET_process_titles(self) -> dict[str, object]:
347         """Show title history of Process of ?id=."""
348         id_ = self.params.get_int_or_none('id')
349         process = Process.by_id(self.conn, id_)
350         return {'process': process}
351
352     def do_GET_process_descriptions(self) -> dict[str, object]:
353         """Show description historys 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_efforts(self) -> dict[str, object]:
359         """Show default effort history 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_processes(self) -> dict[str, object]:
365         """Show all Processes."""
366         pattern = self.params.get_str('pattern')
367         processes = Process.matching(self.conn, pattern)
368         sort_by = self.params.get_str('sort_by')
369         if sort_by == 'steps':
370             processes.sort(key=lambda p: len(p.explicit_steps))
371         elif sort_by == '-steps':
372             processes.sort(key=lambda p: len(p.explicit_steps), reverse=True)
373         elif sort_by == 'owners':
374             processes.sort(key=lambda p: p.n_owners or 0)
375         elif sort_by == '-owners':
376             processes.sort(key=lambda p: p.n_owners or 0, reverse=True)
377         elif sort_by == 'effort':
378             processes.sort(key=lambda p: p.effort.newest)
379         elif sort_by == '-effort':
380             processes.sort(key=lambda p: p.effort.newest, reverse=True)
381         elif sort_by == '-title':
382             processes.sort(key=lambda p: p.title.newest, reverse=True)
383         else:
384             processes.sort(key=lambda p: p.title.newest)
385         return {'processes': processes, 'sort_by': sort_by, 'pattern': pattern}
386
387     def do_POST(self) -> None:
388         """Handle any POST request."""
389         # pylint: disable=attribute-defined-outside-init
390         try:
391             self._init_handling()
392             length = int(self.headers['content-length'])
393             postvars = parse_qs(self.rfile.read(length).decode(),
394                                 keep_blank_values=True, strict_parsing=True)
395             self.form_data = InputsParser(postvars)
396             if hasattr(self, f'do_POST_{self.site}'):
397                 redir_target = getattr(self, f'do_POST_{self.site}')()
398                 self.conn.commit()
399             else:
400                 msg = f'Page not known as POST target: /{self.site}'
401                 raise NotFoundException(msg)
402             self._redirect(redir_target)
403         except HandledException as error:
404             self._send_msg(error, code=error.http_code)
405         finally:
406             self.conn.close()
407
408     def do_POST_day(self) -> str:
409         """Update or insert Day of date and Todos mapped to it."""
410         date = self.params.get_str('date')
411         day = Day.by_id(self.conn, date, create=True)
412         day.comment = self.form_data.get_str('day_comment')
413         day.save(self.conn)
414         for process_id in sorted(self.form_data.get_all_int('new_todo')):
415             Todo.create_with_children(self.conn, process_id, date)
416         done_ids = self.form_data.get_all_int('done')
417         comments = self.form_data.get_all_str('comment')
418         efforts = self.form_data.get_all_str('effort')
419         for i, todo_id in enumerate(self.form_data.get_all_int('todo_id')):
420             todo = Todo.by_id(self.conn, todo_id)
421             todo.is_done = todo_id in done_ids
422             if len(comments) > 0:
423                 todo.comment = comments[i]
424             if len(efforts) > 0:
425                 todo.effort = float(efforts[i]) if efforts[i] else None
426             todo.save(self.conn)
427             for condition in todo.enables:
428                 condition.save(self.conn)
429             for condition in todo.disables:
430                 condition.save(self.conn)
431         return f'/day?date={date}'
432
433     def do_POST_todo(self) -> str:
434         """Update Todo and its children."""
435         id_ = self.params.get_int('id')
436         for _ in self.form_data.get_all_str('delete'):
437             todo = Todo .by_id(self.conn, id_)
438             todo.remove(self.conn)
439             return '/'
440         todo = Todo.by_id(self.conn, id_)
441         adopted_child_ids = self.form_data.get_all_int('adopt')
442         processes_to_make = self.form_data.get_all_int('make')
443         fill_fors = self.form_data.get_first_strings_starting('fill_for_')
444         for v in fill_fors.values():
445             if v.startswith('make_'):
446                 processes_to_make += [int(v[5:])]
447             elif v != 'ignore':
448                 adopted_child_ids += [int(v)]
449         to_remove = []
450         for child in todo.children:
451             assert isinstance(child.id_, int)
452             if child.id_ not in adopted_child_ids:
453                 to_remove += [child.id_]
454         for id_ in to_remove:
455             child = Todo.by_id(self.conn, id_)
456             todo.remove_child(child)
457         for child_id in adopted_child_ids:
458             if child_id in [c.id_ for c in todo.children]:
459                 continue
460             child = Todo.by_id(self.conn, child_id)
461             todo.add_child(child)
462         for process_id in processes_to_make:
463             made = Todo.create_with_children(self.conn, process_id, todo.date)
464             todo.add_child(made)
465         effort = self.form_data.get_str('effort', ignore_strict=True)
466         todo.effort = float(effort) if effort else None
467         todo.set_conditions(self.conn, self.form_data.get_all_int('condition'))
468         todo.set_blockers(self.conn, self.form_data.get_all_int('blocker'))
469         todo.set_enables(self.conn, self.form_data.get_all_int('enables'))
470         todo.set_disables(self.conn, self.form_data.get_all_int('disables'))
471         todo.is_done = len(self.form_data.get_all_str('done')) > 0
472         todo.calendarize = len(self.form_data.get_all_str('calendarize')) > 0
473         todo.comment = self.form_data.get_str('comment', ignore_strict=True)
474         todo.save(self.conn)
475         for condition in todo.enables:
476             condition.save(self.conn)
477         for condition in todo.disables:
478             condition.save(self.conn)
479         return f'/todo?id={todo.id_}'
480
481     def _do_POST_versioned_timestamps(self, cls: Any, attr_name: str) -> str:
482         """Update history timestamps for VersionedAttribute."""
483         id_ = self.params.get_int_or_none('id')
484         item = cls.by_id(self.conn, id_)
485         attr = getattr(item, attr_name)
486         for k, v in self.form_data.get_first_strings_starting('at:').items():
487             old = k[3:]
488             if old[19:] != v:
489                 attr.reset_timestamp(old, f'{v}.0')
490         attr.save(self.conn)
491         cls_name = cls.__name__.lower()
492         return f'/{cls_name}_{attr_name}s?id={item.id_}'
493
494     def do_POST_process_descriptions(self) -> str:
495         """Update history timestamps for Process.description."""
496         return self._do_POST_versioned_timestamps(Process, 'description')
497
498     def do_POST_process_efforts(self) -> str:
499         """Update history timestamps for Process.effort."""
500         return self._do_POST_versioned_timestamps(Process, 'effort')
501
502     def do_POST_process_titles(self) -> str:
503         """Update history timestamps for Process.title."""
504         return self._do_POST_versioned_timestamps(Process, 'title')
505
506     def do_POST_process(self) -> str:
507         """Update or insert Process of ?id= and fields defined in postvars."""
508         # pylint: disable=too-many-branches
509         id_ = self.params.get_int_or_none('id')
510         for _ in self.form_data.get_all_str('delete'):
511             process = Process.by_id(self.conn, id_)
512             process.remove(self.conn)
513             return '/processes'
514         process = Process.by_id(self.conn, id_, create=True)
515         process.title.set(self.form_data.get_str('title'))
516         process.description.set(self.form_data.get_str('description'))
517         process.effort.set(self.form_data.get_float('effort'))
518         process.set_conditions(self.conn,
519                                self.form_data.get_all_int('condition'))
520         process.set_blockers(self.conn, self.form_data.get_all_int('blocker'))
521         process.set_enables(self.conn, self.form_data.get_all_int('enables'))
522         process.set_disables(self.conn, self.form_data.get_all_int('disables'))
523         process.calendarize = self.form_data.get_all_str('calendarize') != []
524         process.save(self.conn)
525         assert isinstance(process.id_, int)
526         steps: list[ProcessStep] = []
527         for step_id in self.form_data.get_all_int('keep_step'):
528             if step_id not in self.form_data.get_all_int('steps'):
529                 raise BadFormatException('trying to keep unknown step')
530         for step_id in self.form_data.get_all_int('steps'):
531             if step_id not in self.form_data.get_all_int('keep_step'):
532                 continue
533             step_process_id = self.form_data.get_int(
534                     f'step_{step_id}_process_id')
535             parent_id = self.form_data.get_int_or_none(
536                     f'step_{step_id}_parent_id')
537             steps += [ProcessStep(step_id, process.id_, step_process_id,
538                                   parent_id)]
539         for step_id in self.form_data.get_all_int('steps'):
540             for step_process_id in self.form_data.get_all_int(
541                     f'new_step_to_{step_id}'):
542                 steps += [ProcessStep(None, process.id_, step_process_id,
543                                       step_id)]
544         new_step_title = None
545         for step_identifier in self.form_data.get_all_str('new_top_step'):
546             try:
547                 step_process_id = int(step_identifier)
548                 steps += [ProcessStep(None, process.id_, step_process_id,
549                                       None)]
550             except ValueError:
551                 new_step_title = step_identifier
552         process.uncache()
553         process.set_steps(self.conn, steps)
554         process.set_step_suppressions(self.conn,
555                                       self.form_data.get_all_int('suppresses'))
556         process.save(self.conn)
557         owners_to_set = []
558         new_owner_title = None
559         for owner_identifier in self.form_data.get_all_str('step_of'):
560             try:
561                 owners_to_set += [int(owner_identifier)]
562             except ValueError:
563                 new_owner_title = owner_identifier
564         process.set_owners(self.conn, owners_to_set)
565         params = f'id={process.id_}'
566         if new_step_title:
567             title_b64_encoded = b64encode(new_step_title.encode()).decode()
568             params = f'step_to={process.id_}&title_b64={title_b64_encoded}'
569         elif new_owner_title:
570             title_b64_encoded = b64encode(new_owner_title.encode()).decode()
571             params = f'has_step={process.id_}&title_b64={title_b64_encoded}'
572         return f'/process?{params}'
573
574     def do_POST_condition_descriptions(self) -> str:
575         """Update history timestamps for Condition.description."""
576         return self._do_POST_versioned_timestamps(Condition, 'description')
577
578     def do_POST_condition_titles(self) -> str:
579         """Update history timestamps for Condition.title."""
580         return self._do_POST_versioned_timestamps(Condition, 'title')
581
582     def do_POST_condition(self) -> str:
583         """Update/insert Condition of ?id= and fields defined in postvars."""
584         id_ = self.params.get_int_or_none('id')
585         for _ in self.form_data.get_all_str('delete'):
586             condition = Condition.by_id(self.conn, id_)
587             condition.remove(self.conn)
588             return '/conditions'
589         condition = Condition.by_id(self.conn, id_, create=True)
590         condition.is_active = self.form_data.get_all_str('is_active') != []
591         condition.title.set(self.form_data.get_str('title'))
592         condition.description.set(self.form_data.get_str('description'))
593         condition.save(self.conn)
594         return f'/condition?id={condition.id_}'
595
596     def _init_handling(self) -> None:
597         # pylint: disable=attribute-defined-outside-init
598         self.conn = DatabaseConnection(self.server.db)
599         parsed_url = urlparse(self.path)
600         self.site = path_split(parsed_url.path)[1]
601         params = parse_qs(parsed_url.query, strict_parsing=True)
602         self.params = InputsParser(params, False)
603
604     def _redirect(self, target: str) -> None:
605         self.send_response(302)
606         self.send_header('Location', target)
607         self.end_headers()
608
609     def _send_html(self, html: str, code: int = 200) -> None:
610         """Send HTML as proper HTTP response."""
611         self.send_response(code)
612         self.end_headers()
613         self.wfile.write(bytes(html, 'utf-8'))
614
615     def _send_msg(self, msg: Exception, code: int = 400) -> None:
616         """Send message in HTML formatting as HTTP response."""
617         html = self.server.jinja.get_template('msg.html').render(msg=msg)
618         self._send_html(html, code)