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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         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)