plomlompom.com Git - plomtask/blob - plomtask/http.py

   1 """Web server stuff."""
   2 from typing import Any
   3 from http.server import BaseHTTPRequestHandler
   4 from http.server import HTTPServer
   5 from urllib.parse import urlparse, parse_qs
   6 from os.path import split as path_split
   7 from jinja2 import Environment as JinjaEnv, FileSystemLoader as JinjaFSLoader
   8 from plomtask.days import Day, todays_date
   9 from plomtask.exceptions import HandledException, BadFormatException, \
  10         NotFoundException
  11 from plomtask.db import DatabaseConnection, DatabaseFile
  12 from plomtask.processes import Process
  13 from plomtask.conditions import Condition
  14 from plomtask.todos import Todo
  15
  16 TEMPLATES_DIR = 'templates'
  17
  18
  19 class TaskServer(HTTPServer):
  20     """Variant of HTTPServer that knows .jinja as Jinja Environment."""
  21
  22     def __init__(self, db_file: DatabaseFile,
  23                  *args: Any, **kwargs: Any) -> None:
  24         super().__init__(*args, **kwargs)
  25         self.db = db_file
  26         self.jinja = JinjaEnv(loader=JinjaFSLoader(TEMPLATES_DIR))
  27
  28
  29 class InputsParser:
  30     """Wrapper for validating and retrieving dict-like HTTP inputs."""
  31
  32     def __init__(self, dict_: dict[str, list[str]],
  33                  strictness: bool = True) -> None:
  34         self.inputs = dict_
  35         self.strict = strictness
  36
  37     def get_str(self, key: str, default: str = '',
  38                 ignore_strict: bool = False) -> str:
  39         """Retrieve single/first string value of key, or default."""
  40         if key not in self.inputs.keys() or 0 == len(self.inputs[key]):
  41             if self.strict and not ignore_strict:
  42                 raise BadFormatException(f'no value found for key {key}')
  43             return default
  44         return self.inputs[key][0]
  45
  46     def get_int(self, key: str) -> int:
  47         """Retrieve single/first value of key as int, error if empty."""
  48         val = self.get_int_or_none(key)
  49         if val is None:
  50             raise BadFormatException(f'unexpected empty value for: {key}')
  51         return val
  52
  53     def get_int_or_none(self, key: str) -> int | None:
  54         """Retrieve single/first value of key as int, return None if empty."""
  55         val = self.get_str(key, ignore_strict=True)
  56         if val == '':
  57             return None
  58         try:
  59             return int(val)
  60         except ValueError as e:
  61             msg = f'cannot int form field value for key {key}: {val}'
  62             raise BadFormatException(msg) from e
  63
  64     def get_float(self, key: str) -> float:
  65         """Retrieve float value of key from self.postvars."""
  66         val = self.get_str(key)
  67         try:
  68             return float(val)
  69         except ValueError as e:
  70             msg = f'cannot float form field value for key {key}: {val}'
  71             raise BadFormatException(msg) from e
  72
  73     def get_all_str(self, key: str) -> list[str]:
  74         """Retrieve list of string values at key."""
  75         if key not in self.inputs.keys():
  76             return []
  77         return self.inputs[key]
  78
  79     def get_all_int(self, key: str) -> list[int]:
  80         """Retrieve list of int values at key."""
  81         all_str = self.get_all_str(key)
  82         try:
  83             return [int(s) for s in all_str if len(s) > 0]
  84         except ValueError as e:
  85             msg = f'cannot int a form field value for key {key} in: {all_str}'
  86             raise BadFormatException(msg) from e
  87
  88
  89 class TaskHandler(BaseHTTPRequestHandler):
  90     """Handles single HTTP request."""
  91     server: TaskServer
  92
  93     def do_GET(self) -> None:
  94         """Handle any GET request."""
  95         try:
  96             self._init_handling()
  97             if self.site in {'calendar', 'day', 'process', 'processes', 'todo',
  98                              'condition', 'conditions'}:
  99                 template = f'{self.site}.html'
 100                 ctx = getattr(self, f'do_GET_{self.site}')()
 101                 html = self.server.jinja.get_template(template).render(**ctx)
 102                 self._send_html(html)
 103             elif '' == self.site:
 104                 self._redirect('/day')
 105             else:
 106                 raise NotFoundException(f'Unknown page: /{self.site}')
 107         except HandledException as error:
 108             self._send_msg(error, code=error.http_code)
 109         finally:
 110             self.conn.close()
 111
 112     def do_GET_calendar(self) -> dict[str, object]:
 113         """Show Days from ?start= to ?end=."""
 114         start = self.params.get_str('start')
 115         end = self.params.get_str('end')
 116         days = Day.all(self.conn, date_range=(start, end), fill_gaps=True)
 117         return {'start': start, 'end': end, 'days': days}
 118
 119     def do_GET_day(self) -> dict[str, object]:
 120         """Show single Day of ?date=."""
 121         date = self.params.get_str('date', todays_date())
 122         todays_todos = Todo.by_date(self.conn, date)
 123         conditions_present = []
 124         enablers_for = {}
 125         for todo in todays_todos:
 126             for condition in todo.conditions:
 127                 if condition not in conditions_present:
 128                     conditions_present += [condition]
 129                     enablers_for[condition.id_] = [p for p in
 130                                                    Process.all(self.conn)
 131                                                    if condition in p.enables]
 132         seen_todos: set[int] = set()
 133         top_nodes = [t.get_step_tree(seen_todos)
 134                      for t in todays_todos if not t.parents]
 135         return {'day': Day.by_id(self.conn, date, create=True),
 136                 'top_nodes': top_nodes,
 137                 'enablers_for': enablers_for,
 138                 'conditions_present': conditions_present,
 139                 'processes': Process.all(self.conn)}
 140
 141     def do_GET_todo(self) -> dict[str, object]:
 142         """Show single Todo of ?id=."""
 143         id_ = self.params.get_int('id')
 144         todo = Todo.by_id(self.conn, id_)
 145         return {'todo': todo,
 146                 'todo_candidates': Todo.by_date(self.conn, todo.date),
 147                 'condition_candidates': Condition.all(self.conn)}
 148
 149     def do_GET_conditions(self) -> dict[str, object]:
 150         """Show all Conditions."""
 151         return {'conditions': Condition.all(self.conn)}
 152
 153     def do_GET_condition(self) -> dict[str, object]:
 154         """Show Condition of ?id=."""
 155         id_ = self.params.get_int_or_none('id')
 156         return {'condition': Condition.by_id(self.conn, id_, create=True)}
 157
 158     def do_GET_process(self) -> dict[str, object]:
 159         """Show process of ?id=."""
 160         id_ = self.params.get_int_or_none('id')
 161         process = Process.by_id(self.conn, id_, create=True)
 162         return {'process': process,
 163                 'steps': process.get_steps(self.conn),
 164                 'owners': process.used_as_step_by(self.conn),
 165                 'step_candidates': Process.all(self.conn),
 166                 'condition_candidates': Condition.all(self.conn)}
 167
 168     def do_GET_processes(self) -> dict[str, object]:
 169         """Show all Processes."""
 170         return {'processes': Process.all(self.conn)}
 171
 172     def do_POST(self) -> None:
 173         """Handle any POST request."""
 174         # pylint: disable=attribute-defined-outside-init
 175         try:
 176             self._init_handling()
 177             length = int(self.headers['content-length'])
 178             postvars = parse_qs(self.rfile.read(length).decode(),
 179                                 keep_blank_values=True, strict_parsing=True)
 180             self.form_data = InputsParser(postvars)
 181             if self.site in ('day', 'process', 'todo', 'condition'):
 182                 redir_target = getattr(self, f'do_POST_{self.site}')()
 183                 self.conn.commit()
 184             else:
 185                 msg = f'Page not known as POST target: /{self.site}'
 186                 raise NotFoundException(msg)
 187             self._redirect(redir_target)
 188         except HandledException as error:
 189             self._send_msg(error, code=error.http_code)
 190         finally:
 191             self.conn.close()
 192
 193     def do_POST_day(self) -> str:
 194         """Update or insert Day of date and Todos mapped to it."""
 195         date = self.params.get_str('date')
 196         day = Day.by_id(self.conn, date, create=True)
 197         day.comment = self.form_data.get_str('comment')
 198         day.save(self.conn)
 199         new_todos = []
 200         for process_id in self.form_data.get_all_int('new_todo'):
 201             process = Process.by_id(self.conn, process_id)
 202             todo = Todo(None, process, False, day.date)
 203             todo.save(self.conn)
 204             new_todos += [todo]
 205         adopted = True
 206         while adopted:
 207             adopted = False
 208             existing_todos = Todo.by_date(self.conn, date)
 209             for todo in new_todos:
 210                 if todo.adopt_from(existing_todos):
 211                     adopted = True
 212                 todo.make_missing_children(self.conn)
 213                 todo.save(self.conn)
 214         done_ids = self.form_data.get_all_int('done')
 215         for todo_id in self.form_data.get_all_int('todo_id'):
 216             todo = Todo.by_id(self.conn, todo_id)
 217             todo.is_done = todo_id in done_ids
 218             todo.save(self.conn)
 219             for condition in todo.enables:
 220                 condition.save(self.conn)
 221             for condition in todo.disables:
 222                 condition.save(self.conn)
 223         return f'/day?date={date}'
 224
 225     def do_POST_todo(self) -> str:
 226         """Update Todo and its children."""
 227         id_ = self.params.get_int('id')
 228         for _ in self.form_data.get_all_str('delete'):
 229             todo = Todo .by_id(self.conn, id_)
 230             todo.remove(self.conn)
 231             return '/'
 232         todo = Todo.by_id(self.conn, id_)
 233         adopted_child_ids = self.form_data.get_all_int('adopt')
 234         for child in todo.children:
 235             if child.id_ not in adopted_child_ids:
 236                 assert isinstance(child.id_, int)
 237                 child = Todo.by_id(self.conn, child.id_)
 238                 todo.remove_child(child)
 239         for child_id in adopted_child_ids:
 240             if child_id in [c.id_ for c in todo.children]:
 241                 continue
 242             child = Todo.by_id(self.conn, child_id)
 243             todo.add_child(child)
 244         todo.set_conditions(self.conn, self.form_data.get_all_int('condition'))
 245         todo.set_enables(self.conn, self.form_data.get_all_int('enables'))
 246         todo.set_disables(self.conn, self.form_data.get_all_int('disables'))
 247         todo.is_done = len(self.form_data.get_all_str('done')) > 0
 248         todo.save(self.conn)
 249         for condition in todo.enables:
 250             condition.save(self.conn)
 251         for condition in todo.disables:
 252             condition.save(self.conn)
 253         return f'/todo?id={todo.id_}'
 254
 255     def do_POST_process(self) -> str:
 256         """Update or insert Process of ?id= and fields defined in postvars."""
 257         id_ = self.params.get_int_or_none('id')
 258         for _ in self.form_data.get_all_str('delete'):
 259             process = Process.by_id(self.conn, id_)
 260             process.remove(self.conn)
 261             return '/processes'
 262         process = Process.by_id(self.conn, id_, create=True)
 263         process.title.set(self.form_data.get_str('title'))
 264         process.description.set(self.form_data.get_str('description'))
 265         process.effort.set(self.form_data.get_float('effort'))
 266         process.set_conditions(self.conn,
 267                                self.form_data.get_all_int('condition'))
 268         process.set_enables(self.conn, self.form_data.get_all_int('enables'))
 269         process.set_disables(self.conn, self.form_data.get_all_int('disables'))
 270         process.save(self.conn)
 271         process.explicit_steps = []
 272         steps: list[tuple[int | None, int, int | None]] = []
 273         for step_id in self.form_data.get_all_int('steps'):
 274             for step_process_id in self.form_data.get_all_int(
 275                     f'new_step_to_{step_id}'):
 276                 steps += [(None, step_process_id, step_id)]
 277             if step_id not in self.form_data.get_all_int('keep_step'):
 278                 continue
 279             step_process_id = self.form_data.get_int(
 280                     f'step_{step_id}_process_id')
 281             parent_id = self.form_data.get_int_or_none(
 282                     f'step_{step_id}_parent_id')
 283             steps += [(step_id, step_process_id, parent_id)]
 284         for step_process_id in self.form_data.get_all_int('new_top_step'):
 285             steps += [(None, step_process_id, None)]
 286         process.set_steps(self.conn, steps)
 287         process.save(self.conn)
 288         return f'/process?id={process.id_}'
 289
 290     def do_POST_condition(self) -> str:
 291         """Update/insert Condition of ?id= and fields defined in postvars."""
 292         id_ = self.params.get_int_or_none('id')
 293         for _ in self.form_data.get_all_str('delete'):
 294             condition = Condition.by_id(self.conn, id_)
 295             condition.remove(self.conn)
 296             return '/conditions'
 297         condition = Condition.by_id(self.conn, id_, create=True)
 298         condition.is_active = self.form_data.get_all_str('is_active') != []
 299         condition.title.set(self.form_data.get_str('title'))
 300         condition.description.set(self.form_data.get_str('description'))
 301         condition.save(self.conn)
 302         return f'/condition?id={condition.id_}'
 303
 304     def _init_handling(self) -> None:
 305         # pylint: disable=attribute-defined-outside-init
 306         self.conn = DatabaseConnection(self.server.db)
 307         parsed_url = urlparse(self.path)
 308         self.site = path_split(parsed_url.path)[1]
 309         params = parse_qs(parsed_url.query, strict_parsing=True)
 310         self.params = InputsParser(params, False)
 311
 312     def _redirect(self, target: str) -> None:
 313         self.send_response(302)
 314         self.send_header('Location', target)
 315         self.end_headers()
 316
 317     def _send_html(self, html: str, code: int = 200) -> None:
 318         """Send HTML as proper HTTP response."""
 319         self.send_response(code)
 320         self.end_headers()
 321         self.wfile.write(bytes(html, 'utf-8'))
 322
 323     def _send_msg(self, msg: Exception, code: int = 400) -> None:
 324         """Send message in HTML formatting as HTTP response."""
 325         html = self.server.jinja.get_template('msg.html').render(msg=msg)
 326         self._send_html(html, code)