home · contact · privacy
26c8b719fec481e4106d66073a85844a1d16491a
[plomtask] / plomtask / http.py
1 """Web server stuff."""
2 from __future__ import annotations
3 from dataclasses import dataclass
4 from typing import Any, Callable, Mapping
5 from base64 import b64encode, b64decode
6 from http.server import BaseHTTPRequestHandler
7 from http.server import HTTPServer
8 from urllib.parse import urlparse, parse_qs
9 from os.path import split as path_split
10 from jinja2 import Environment as JinjaEnv, FileSystemLoader as JinjaFSLoader
11 from plomtask.dating import date_in_n_days
12 from plomtask.days import Day
13 from plomtask.exceptions import HandledException, BadFormatException, \
14         NotFoundException
15 from plomtask.db import DatabaseConnection, DatabaseFile
16 from plomtask.processes import Process, ProcessStep, ProcessStepsNode
17 from plomtask.conditions import Condition
18 from plomtask.todos import Todo
19
20 TEMPLATES_DIR = 'templates'
21
22
23 class TaskServer(HTTPServer):
24     """Variant of HTTPServer that knows .jinja as Jinja Environment."""
25
26     def __init__(self, db_file: DatabaseFile,
27                  *args: Any, **kwargs: Any) -> None:
28         super().__init__(*args, **kwargs)
29         self.db = db_file
30         self.jinja = JinjaEnv(loader=JinjaFSLoader(TEMPLATES_DIR))
31
32
33 class InputsParser:
34     """Wrapper for validating and retrieving dict-like HTTP inputs."""
35
36     def __init__(self, dict_: dict[str, list[str]],
37                  strictness: bool = True) -> None:
38         self.inputs = dict_
39         self.strict = strictness
40
41     def get_str(self, key: str, default: str = '',
42                 ignore_strict: bool = False) -> str:
43         """Retrieve single/first string value of key, or default."""
44         if key not in self.inputs.keys() or 0 == len(self.inputs[key]):
45             if self.strict and not ignore_strict:
46                 raise BadFormatException(f'no value found for key {key}')
47             return default
48         return self.inputs[key][0]
49
50     def get_first_strings_starting(self, prefix: str) -> dict[str, str]:
51         """Retrieve dict of (first) strings at key starting with prefix."""
52         ret = {}
53         for key in [k for k in self.inputs.keys() if k.startswith(prefix)]:
54             ret[key] = self.inputs[key][0]
55         return ret
56
57     def get_int(self, key: str) -> int:
58         """Retrieve single/first value of key as int, error if empty."""
59         val = self.get_int_or_none(key)
60         if val is None:
61             raise BadFormatException(f'unexpected empty value for: {key}')
62         return val
63
64     def get_int_or_none(self, key: str) -> int | None:
65         """Retrieve single/first value of key as int, return None if empty."""
66         val = self.get_str(key, ignore_strict=True)
67         if val == '':
68             return None
69         try:
70             return int(val)
71         except ValueError as e:
72             msg = f'cannot int form field value for key {key}: {val}'
73             raise BadFormatException(msg) from e
74
75     def get_float(self, key: str) -> float:
76         """Retrieve float value of key from self.postvars."""
77         val = self.get_str(key)
78         try:
79             return float(val)
80         except ValueError as e:
81             msg = f'cannot float form field value for key {key}: {val}'
82             raise BadFormatException(msg) from e
83
84     def get_all_str(self, key: str) -> list[str]:
85         """Retrieve list of string values at key."""
86         if key not in self.inputs.keys():
87             return []
88         return self.inputs[key]
89
90     def get_all_int(self, key: str) -> list[int]:
91         """Retrieve list of int values at key."""
92         all_str = self.get_all_str(key)
93         try:
94             return [int(s) for s in all_str if len(s) > 0]
95         except ValueError as e:
96             msg = f'cannot int a form field value for key {key} in: {all_str}'
97             raise BadFormatException(msg) from e
98
99
100 class TaskHandler(BaseHTTPRequestHandler):
101     """Handles single HTTP request."""
102     # pylint: disable=too-many-public-methods
103     server: TaskServer
104     conn: DatabaseConnection
105     _site: str
106     _form_data: InputsParser
107     _params: InputsParser
108
109     def _send_html(self,
110                    tmpl_name: str,
111                    ctx: Mapping[str, object],
112                    code: int = 200) -> None:
113         """Send HTML as proper HTTP response."""
114         tmpl = self.server.jinja.get_template(tmpl_name)
115         html = tmpl.render(ctx)
116         self.send_response(code)
117         self.end_headers()
118         self.wfile.write(bytes(html, 'utf-8'))
119
120     @staticmethod
121     def _request_wrapper(http_method: str, not_found_msg: str
122                          ) -> Callable[..., Callable[[TaskHandler], None]]:
123         def decorator(f: Callable[..., str | None]
124                       ) -> Callable[[TaskHandler], None]:
125             def wrapper(self: TaskHandler) -> None:
126                 # pylint: disable=protected-access
127                 # (because pylint here fails to detect the use of wrapper as a
128                 # method to self with respective access privileges)
129                 try:
130                     self.conn = DatabaseConnection(self.server.db)
131                     parsed_url = urlparse(self.path)
132                     self._site = path_split(parsed_url.path)[1]
133                     params = parse_qs(parsed_url.query, strict_parsing=True)
134                     self._params = InputsParser(params, False)
135                     handler_name = f'do_{http_method}_{self._site}'
136                     if hasattr(self, handler_name):
137                         handler = getattr(self, handler_name)
138                         redir_target = f(self, handler)
139                         if redir_target:
140                             self.send_response(302)
141                             self.send_header('Location', redir_target)
142                             self.end_headers()
143                     else:
144                         msg = f'{not_found_msg}: {self._site}'
145                         raise NotFoundException(msg)
146                 except HandledException as error:
147                     for cls in (Day, Todo, Condition, Process, ProcessStep):
148                         assert hasattr(cls, 'empty_cache')
149                         cls.empty_cache()
150                     ctx = {'msg': error}
151                     self._send_html('msg.html', ctx, error.http_code)
152                 finally:
153                     self.conn.close()
154             return wrapper
155         return decorator
156
157     @_request_wrapper('GET', 'Unknown page')
158     def do_GET(self, handler: Callable[[], str | dict[str, object]]
159                ) -> str | None:
160         """Render page with result of handler, or redirect if result is str."""
161         tmpl_name = f'{self._site}.html'
162         ctx_or_redir = handler()
163         if isinstance(ctx_or_redir, str):
164             return ctx_or_redir
165         self._send_html(tmpl_name, ctx_or_redir)
166         return None
167
168     @_request_wrapper('POST', 'Unknown POST target')
169     def do_POST(self, handler: Callable[[], str]) -> str:
170         """Handle POST with handler, prepare redirection to result."""
171         length = int(self.headers['content-length'])
172         postvars = parse_qs(self.rfile.read(length).decode(),
173                             keep_blank_values=True, strict_parsing=True)
174         self._form_data = InputsParser(postvars)
175         redir_target = handler()
176         self.conn.commit()
177         return redir_target
178
179     # GET handlers
180
181     def do_GET_(self) -> str:
182         """Return redirect target on GET /."""
183         return '/day'
184
185     def _do_GET_calendar(self) -> dict[str, object]:
186         """Show Days from ?start= to ?end=.
187
188         Both .do_GET_calendar and .do_GET_calendar_txt refer to this to do the
189         same, the only difference being the HTML template they are rendered to,
190         which .do_GET selects from their method name.
191         """
192         start = self._params.get_str('start')
193         end = self._params.get_str('end')
194         if not end:
195             end = date_in_n_days(366)
196         ret = Day.by_date_range_with_limits(self.conn, (start, end), 'id')
197         days, start, end = ret
198         days = Day.with_filled_gaps(days, start, end)
199         today = date_in_n_days(0)
200         return {'start': start, 'end': end, 'days': days, 'today': today}
201
202     def do_GET_calendar(self) -> dict[str, object]:
203         """Show Days from ?start= to ?end= – normal view."""
204         return self._do_GET_calendar()
205
206     def do_GET_calendar_txt(self) -> dict[str, object]:
207         """Show Days from ?start= to ?end= – minimalist view."""
208         return self._do_GET_calendar()
209
210     def do_GET_day(self) -> dict[str, object]:
211         """Show single Day of ?date=."""
212         date = self._params.get_str('date', date_in_n_days(0))
213         day = Day.by_id(self.conn, date, create=True)
214         make_type = self._params.get_str('make_type')
215         conditions_present = []
216         enablers_for = {}
217         disablers_for = {}
218         for todo in day.todos:
219             for condition in todo.conditions + todo.blockers:
220                 if condition not in conditions_present:
221                     conditions_present += [condition]
222                     enablers_for[condition.id_] = [p for p in
223                                                    Process.all(self.conn)
224                                                    if condition in p.enables]
225                     disablers_for[condition.id_] = [p for p in
226                                                     Process.all(self.conn)
227                                                     if condition in p.disables]
228         seen_todos: set[int] = set()
229         top_nodes = [t.get_step_tree(seen_todos)
230                      for t in day.todos if not t.parents]
231         return {'day': day,
232                 'top_nodes': top_nodes,
233                 'make_type': make_type,
234                 'enablers_for': enablers_for,
235                 'disablers_for': disablers_for,
236                 'conditions_present': conditions_present,
237                 'processes': Process.all(self.conn)}
238
239     def do_GET_todo(self) -> dict[str, object]:
240         """Show single Todo of ?id=."""
241
242         @dataclass
243         class TodoStepsNode:
244             """Collect what's useful for Todo steps tree display."""
245             id_: int
246             todo: Todo | None
247             process: Process | None
248             children: list[TodoStepsNode]  # pylint: disable=undefined-variable
249             fillable: bool = False
250
251         def walk_process_steps(id_: int,
252                                process_step_nodes: list[ProcessStepsNode],
253                                steps_nodes: list[TodoStepsNode]) -> None:
254             for process_step_node in process_step_nodes:
255                 id_ += 1
256                 node = TodoStepsNode(id_, None, process_step_node.process, [])
257                 steps_nodes += [node]
258                 walk_process_steps(id_, list(process_step_node.steps.values()),
259                                    node.children)
260
261         def walk_todo_steps(id_: int, todos: list[Todo],
262                             steps_nodes: list[TodoStepsNode]) -> None:
263             for todo in todos:
264                 matched = False
265                 for match in [item for item in steps_nodes
266                               if item.process
267                               and item.process == todo.process]:
268                     match.todo = todo
269                     matched = True
270                     for child in match.children:
271                         child.fillable = True
272                     walk_todo_steps(id_, todo.children, match.children)
273                 if not matched:
274                     id_ += 1
275                     node = TodoStepsNode(id_, todo, None, [])
276                     steps_nodes += [node]
277                     walk_todo_steps(id_, todo.children, node.children)
278
279         def collect_adoptables_keys(steps_nodes: list[TodoStepsNode]
280                                     ) -> set[int]:
281             ids = set()
282             for node in steps_nodes:
283                 if not node.todo:
284                     assert isinstance(node.process, Process)
285                     assert isinstance(node.process.id_, int)
286                     ids.add(node.process.id_)
287                 ids = ids | collect_adoptables_keys(node.children)
288             return ids
289
290         id_ = self._params.get_int('id')
291         todo = Todo.by_id(self.conn, id_)
292         todo_steps = [step.todo for step in todo.get_step_tree(set()).children]
293         process_tree = todo.process.get_steps(self.conn, None)
294         steps_todo_to_process: list[TodoStepsNode] = []
295         walk_process_steps(0, list(process_tree.values()),
296                            steps_todo_to_process)
297         for steps_node in steps_todo_to_process:
298             steps_node.fillable = True
299         walk_todo_steps(len(steps_todo_to_process), todo_steps,
300                         steps_todo_to_process)
301         adoptables: dict[int, list[Todo]] = {}
302         any_adoptables = [Todo.by_id(self.conn, t.id_)
303                           for t in Todo.by_date(self.conn, todo.date)
304                           if t != todo]
305         for id_ in collect_adoptables_keys(steps_todo_to_process):
306             adoptables[id_] = [t for t in any_adoptables
307                                if t.process.id_ == id_]
308         return {'todo': todo, 'steps_todo_to_process': steps_todo_to_process,
309                 'adoption_candidates_for': adoptables,
310                 'process_candidates': Process.all(self.conn),
311                 'todo_candidates': any_adoptables,
312                 'condition_candidates': Condition.all(self.conn)}
313
314     def do_GET_todos(self) -> dict[str, object]:
315         """Show Todos from ?start= to ?end=, of ?process=, ?comment= pattern"""
316         sort_by = self._params.get_str('sort_by')
317         start = self._params.get_str('start')
318         end = self._params.get_str('end')
319         process_id = self._params.get_int_or_none('process_id')
320         comment_pattern = self._params.get_str('comment_pattern')
321         todos = []
322         ret = Todo.by_date_range_with_limits(self.conn, (start, end))
323         todos_by_date_range, start, end = ret
324         todos = [t for t in todos_by_date_range
325                  if comment_pattern in t.comment
326                  and ((not process_id) or t.process.id_ == process_id)]
327         if sort_by == 'doneness':
328             todos.sort(key=lambda t: t.is_done)
329         elif sort_by == '-doneness':
330             todos.sort(key=lambda t: t.is_done, reverse=True)
331         elif sort_by == 'title':
332             todos.sort(key=lambda t: t.title_then)
333         elif sort_by == '-title':
334             todos.sort(key=lambda t: t.title_then, reverse=True)
335         elif sort_by == 'comment':
336             todos.sort(key=lambda t: t.comment)
337         elif sort_by == '-comment':
338             todos.sort(key=lambda t: t.comment, reverse=True)
339         elif sort_by == '-date':
340             todos.sort(key=lambda t: t.date, reverse=True)
341         else:
342             todos.sort(key=lambda t: t.date)
343         return {'start': start, 'end': end, 'process_id': process_id,
344                 'comment_pattern': comment_pattern, 'todos': todos,
345                 'all_processes': Process.all(self.conn), 'sort_by': sort_by}
346
347     def do_GET_conditions(self) -> dict[str, object]:
348         """Show all Conditions."""
349         pattern = self._params.get_str('pattern')
350         conditions = Condition.matching(self.conn, pattern)
351         sort_by = self._params.get_str('sort_by')
352         if sort_by == 'is_active':
353             conditions.sort(key=lambda c: c.is_active)
354         elif sort_by == '-is_active':
355             conditions.sort(key=lambda c: c.is_active, reverse=True)
356         elif sort_by == '-title':
357             conditions.sort(key=lambda c: c.title.newest, reverse=True)
358         else:
359             conditions.sort(key=lambda c: c.title.newest)
360         return {'conditions': conditions,
361                 'sort_by': sort_by,
362                 'pattern': pattern}
363
364     def do_GET_condition(self) -> dict[str, object]:
365         """Show Condition of ?id=."""
366         id_ = self._params.get_int_or_none('id')
367         c = Condition.by_id(self.conn, id_, create=True)
368         ps = Process.all(self.conn)
369         return {'condition': c, 'is_new': c.id_ is None,
370                 'enabled_processes': [p for p in ps if c in p.conditions],
371                 'disabled_processes': [p for p in ps if c in p.blockers],
372                 'enabling_processes': [p for p in ps if c in p.enables],
373                 'disabling_processes': [p for p in ps if c in p.disables]}
374
375     def do_GET_condition_titles(self) -> dict[str, object]:
376         """Show title history of Condition of ?id=."""
377         id_ = self._params.get_int_or_none('id')
378         condition = Condition.by_id(self.conn, id_)
379         return {'condition': condition}
380
381     def do_GET_condition_descriptions(self) -> dict[str, object]:
382         """Show description historys of Condition of ?id=."""
383         id_ = self._params.get_int_or_none('id')
384         condition = Condition.by_id(self.conn, id_)
385         return {'condition': condition}
386
387     def do_GET_process(self) -> dict[str, object]:
388         """Show Process of ?id=."""
389         id_ = self._params.get_int_or_none('id')
390         process = Process.by_id(self.conn, id_, create=True)
391         title_64 = self._params.get_str('title_b64')
392         if title_64:
393             title = b64decode(title_64.encode()).decode()
394             process.title.set(title)
395         owners = process.used_as_step_by(self.conn)
396         for step_id in self._params.get_all_int('step_to'):
397             owners += [Process.by_id(self.conn, step_id)]
398         preset_top_step = None
399         for process_id in self._params.get_all_int('has_step'):
400             preset_top_step = process_id
401         return {'process': process, 'is_new': process.id_ is None,
402                 'preset_top_step': preset_top_step,
403                 'steps': process.get_steps(self.conn), 'owners': owners,
404                 'n_todos': len(Todo.by_process_id(self.conn, process.id_)),
405                 'process_candidates': Process.all(self.conn),
406                 'condition_candidates': Condition.all(self.conn)}
407
408     def do_GET_process_titles(self) -> dict[str, object]:
409         """Show title history of Process of ?id=."""
410         id_ = self._params.get_int_or_none('id')
411         process = Process.by_id(self.conn, id_)
412         return {'process': process}
413
414     def do_GET_process_descriptions(self) -> dict[str, object]:
415         """Show description historys of Process of ?id=."""
416         id_ = self._params.get_int_or_none('id')
417         process = Process.by_id(self.conn, id_)
418         return {'process': process}
419
420     def do_GET_process_efforts(self) -> dict[str, object]:
421         """Show default effort history of Process of ?id=."""
422         id_ = self._params.get_int_or_none('id')
423         process = Process.by_id(self.conn, id_)
424         return {'process': process}
425
426     def do_GET_processes(self) -> dict[str, object]:
427         """Show all Processes."""
428         pattern = self._params.get_str('pattern')
429         processes = Process.matching(self.conn, pattern)
430         sort_by = self._params.get_str('sort_by')
431         if sort_by == 'steps':
432             processes.sort(key=lambda p: len(p.explicit_steps))
433         elif sort_by == '-steps':
434             processes.sort(key=lambda p: len(p.explicit_steps), reverse=True)
435         elif sort_by == 'owners':
436             processes.sort(key=lambda p: p.n_owners or 0)
437         elif sort_by == '-owners':
438             processes.sort(key=lambda p: p.n_owners or 0, reverse=True)
439         elif sort_by == 'effort':
440             processes.sort(key=lambda p: p.effort.newest)
441         elif sort_by == '-effort':
442             processes.sort(key=lambda p: p.effort.newest, reverse=True)
443         elif sort_by == '-title':
444             processes.sort(key=lambda p: p.title.newest, reverse=True)
445         else:
446             processes.sort(key=lambda p: p.title.newest)
447         return {'processes': processes, 'sort_by': sort_by, 'pattern': pattern}
448
449     # POST handlers
450
451     def _change_versioned_timestamps(self, cls: Any, attr_name: str) -> str:
452         """Update history timestamps for VersionedAttribute."""
453         id_ = self._params.get_int_or_none('id')
454         item = cls.by_id(self.conn, id_)
455         attr = getattr(item, attr_name)
456         for k, v in self._form_data.get_first_strings_starting('at:').items():
457             old = k[3:]
458             if old[19:] != v:
459                 attr.reset_timestamp(old, f'{v}.0')
460         attr.save(self.conn)
461         cls_name = cls.__name__.lower()
462         return f'/{cls_name}_{attr_name}s?id={item.id_}'
463
464     def do_POST_day(self) -> str:
465         """Update or insert Day of date and Todos mapped to it."""
466         date = self._params.get_str('date')
467         day = Day.by_id(self.conn, date, create=True)
468         day.comment = self._form_data.get_str('day_comment')
469         day.save(self.conn)
470         make_type = self._form_data.get_str('make_type')
471         for process_id in sorted(self._form_data.get_all_int('new_todo')):
472             if 'empty' == make_type:
473                 process = Process.by_id(self.conn, process_id)
474                 todo = Todo(None, process, False, date)
475                 todo.save(self.conn)
476             else:
477                 Todo.create_with_children(self.conn, process_id, date)
478         done_ids = self._form_data.get_all_int('done')
479         comments = self._form_data.get_all_str('comment')
480         efforts = self._form_data.get_all_str('effort')
481         for i, todo_id in enumerate(self._form_data.get_all_int('todo_id')):
482             todo = Todo.by_id(self.conn, todo_id)
483             todo.is_done = todo_id in done_ids
484             if len(comments) > 0:
485                 todo.comment = comments[i]
486             if len(efforts) > 0:
487                 todo.effort = float(efforts[i]) if efforts[i] else None
488             todo.save(self.conn)
489         return f'/day?date={date}&make_type={make_type}'
490
491     def do_POST_todo(self) -> str:
492         """Update Todo and its children."""
493         # pylint: disable=too-many-locals
494         # pylint: disable=too-many-branches
495         id_ = self._params.get_int('id')
496         for _ in self._form_data.get_all_str('delete'):
497             todo = Todo .by_id(self.conn, id_)
498             todo.remove(self.conn)
499             return '/'
500         todo = Todo.by_id(self.conn, id_)
501         adopted_child_ids = self._form_data.get_all_int('adopt')
502         processes_to_make_full = self._form_data.get_all_int('make_full')
503         processes_to_make_empty = self._form_data.get_all_int('make_empty')
504         fill_fors = self._form_data.get_first_strings_starting('fill_for_')
505         for v in fill_fors.values():
506             if v.startswith('make_empty_'):
507                 processes_to_make_empty += [int(v[11:])]
508             elif v.startswith('make_full_'):
509                 processes_to_make_full += [int(v[10:])]
510             elif v != 'ignore':
511                 adopted_child_ids += [int(v)]
512         to_remove = []
513         for child in todo.children:
514             assert isinstance(child.id_, int)
515             if child.id_ not in adopted_child_ids:
516                 to_remove += [child.id_]
517         for id_ in to_remove:
518             child = Todo.by_id(self.conn, id_)
519             todo.remove_child(child)
520         for child_id in adopted_child_ids:
521             if child_id in [c.id_ for c in todo.children]:
522                 continue
523             child = Todo.by_id(self.conn, child_id)
524             todo.add_child(child)
525         for process_id in processes_to_make_empty:
526             process = Process.by_id(self.conn, process_id)
527             made = Todo(None, process, False, todo.date)
528             made.save(self.conn)
529             todo.add_child(made)
530         for process_id in processes_to_make_full:
531             made = Todo.create_with_children(self.conn, process_id, todo.date)
532             todo.add_child(made)
533         effort = self._form_data.get_str('effort', ignore_strict=True)
534         todo.effort = float(effort) if effort else None
535         todo.set_conditions(self.conn,
536                             self._form_data.get_all_int('condition'))
537         todo.set_blockers(self.conn, self._form_data.get_all_int('blocker'))
538         todo.set_enables(self.conn, self._form_data.get_all_int('enables'))
539         todo.set_disables(self.conn, self._form_data.get_all_int('disables'))
540         todo.is_done = len(self._form_data.get_all_str('done')) > 0
541         todo.calendarize = len(self._form_data.get_all_str('calendarize')) > 0
542         todo.comment = self._form_data.get_str('comment', ignore_strict=True)
543         todo.save(self.conn)
544         return f'/todo?id={todo.id_}'
545
546     def do_POST_process_descriptions(self) -> str:
547         """Update history timestamps for Process.description."""
548         return self._change_versioned_timestamps(Process, 'description')
549
550     def do_POST_process_efforts(self) -> str:
551         """Update history timestamps for Process.effort."""
552         return self._change_versioned_timestamps(Process, 'effort')
553
554     def do_POST_process_titles(self) -> str:
555         """Update history timestamps for Process.title."""
556         return self._change_versioned_timestamps(Process, 'title')
557
558     def do_POST_process(self) -> str:
559         """Update or insert Process of ?id= and fields defined in postvars."""
560         # pylint: disable=too-many-branches
561         id_ = self._params.get_int_or_none('id')
562         for _ in self._form_data.get_all_str('delete'):
563             process = Process.by_id(self.conn, id_)
564             process.remove(self.conn)
565             return '/processes'
566         process = Process.by_id(self.conn, id_, create=True)
567         process.title.set(self._form_data.get_str('title'))
568         process.description.set(self._form_data.get_str('description'))
569         process.effort.set(self._form_data.get_float('effort'))
570         process.set_conditions(self.conn,
571                                self._form_data.get_all_int('condition'))
572         process.set_blockers(self.conn, self._form_data.get_all_int('blocker'))
573         process.set_enables(self.conn, self._form_data.get_all_int('enables'))
574         process.set_disables(self.conn,
575                              self._form_data.get_all_int('disables'))
576         process.calendarize = self._form_data.get_all_str('calendarize') != []
577         process.save(self.conn)
578         assert isinstance(process.id_, int)
579         steps: list[ProcessStep] = []
580         for step_id in self._form_data.get_all_int('keep_step'):
581             if step_id not in self._form_data.get_all_int('steps'):
582                 raise BadFormatException('trying to keep unknown step')
583         for step_id in self._form_data.get_all_int('steps'):
584             if step_id not in self._form_data.get_all_int('keep_step'):
585                 continue
586             step_process_id = self._form_data.get_int(
587                     f'step_{step_id}_process_id')
588             parent_id = self._form_data.get_int_or_none(
589                     f'step_{step_id}_parent_id')
590             steps += [ProcessStep(step_id, process.id_, step_process_id,
591                                   parent_id)]
592         for step_id in self._form_data.get_all_int('steps'):
593             for step_process_id in self._form_data.get_all_int(
594                     f'new_step_to_{step_id}'):
595                 steps += [ProcessStep(None, process.id_, step_process_id,
596                                       step_id)]
597         new_step_title = None
598         for step_identifier in self._form_data.get_all_str('new_top_step'):
599             try:
600                 step_process_id = int(step_identifier)
601                 steps += [ProcessStep(None, process.id_, step_process_id,
602                                       None)]
603             except ValueError:
604                 new_step_title = step_identifier
605         process.set_steps(self.conn, steps)
606         process.set_step_suppressions(self.conn,
607                                       self._form_data.
608                                       get_all_int('suppresses'))
609         owners_to_set = []
610         new_owner_title = None
611         for owner_identifier in self._form_data.get_all_str('step_of'):
612             try:
613                 owners_to_set += [int(owner_identifier)]
614             except ValueError:
615                 new_owner_title = owner_identifier
616         process.set_owners(self.conn, owners_to_set)
617         params = f'id={process.id_}'
618         if new_step_title:
619             title_b64_encoded = b64encode(new_step_title.encode()).decode()
620             params = f'step_to={process.id_}&title_b64={title_b64_encoded}'
621         elif new_owner_title:
622             title_b64_encoded = b64encode(new_owner_title.encode()).decode()
623             params = f'has_step={process.id_}&title_b64={title_b64_encoded}'
624         process.save(self.conn)
625         return f'/process?{params}'
626
627     def do_POST_condition_descriptions(self) -> str:
628         """Update history timestamps for Condition.description."""
629         return self._change_versioned_timestamps(Condition, 'description')
630
631     def do_POST_condition_titles(self) -> str:
632         """Update history timestamps for Condition.title."""
633         return self._change_versioned_timestamps(Condition, 'title')
634
635     def do_POST_condition(self) -> str:
636         """Update/insert Condition of ?id= and fields defined in postvars."""
637         id_ = self._params.get_int_or_none('id')
638         for _ in self._form_data.get_all_str('delete'):
639             condition = Condition.by_id(self.conn, id_)
640             condition.remove(self.conn)
641             return '/conditions'
642         condition = Condition.by_id(self.conn, id_, create=True)
643         condition.is_active = self._form_data.get_all_str('is_active') != []
644         condition.title.set(self._form_data.get_str('title'))
645         condition.description.set(self._form_data.get_str('description'))
646         condition.save(self.conn)
647         return f'/condition?id={condition.id_}'