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annotate libervia/web/server/websockets.py @ 1611:b695b98851fc

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pages (events/new): use coroutines.
author Goffi <goffi@goffi.org>
date Wed, 12 Jun 2024 23:09:49 +0200
parents eb00d593801d
children
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rev   line source
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1 #!/usr/bin/env python3
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2
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3 # Libervia: a Salut à Toi frontend
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4 # Copyright (C) 2011-2021 Jérôme Poisson <goffi@goffi.org>
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5
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6 # This program is free software: you can redistribute it and/or modify
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7 # it under the terms of the GNU Affero General Public License as published by
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8 # the Free Software Foundation, either version 3 of the License, or
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9 # (at your option) any later version.
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10
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11 # This program is distributed in the hope that it will be useful,
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12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 # GNU Affero General Public License for more details.
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15
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16 # You should have received a copy of the GNU Affero General Public License
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17 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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18
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19
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20 import json
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21 from typing import Optional
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22
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23 from autobahn.twisted import websocket
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24 from autobahn.twisted import resource as resource
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25 from autobahn.websocket import types
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26 from libervia.backend.core import exceptions
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27 from libervia.backend.core.i18n import _
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28 from libervia.backend.core.log import getLogger
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29
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30 from . import session_iface
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31 from .constants import Const as C
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32
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33 log = getLogger(__name__)
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34
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35 host = None
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36
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37
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38 class LiberviaPageWSProtocol(websocket.WebSocketServerProtocol):
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39
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40 def __init__(self):
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41 super().__init__()
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42 self._init_ok: bool = False
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43 self.__profile: Optional[str] = None
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44 self.__session: Optional[session_iface.WebSession] = None
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45
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46 @property
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47 def init_ok(self):
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48 return self._init_ok
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49
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50 def send(self, data_type: str, data: dict) -> None:
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51 """Send data to frontend"""
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52 if not self._init_ok and data_type != "error":
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53 raise exceptions.InternalError(
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54 "send called when not initialized, this should not happend! Please use "
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55 "WebSession.send which takes care of sending correctly the data to all "
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56 "sessions."
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57 )
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58
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59 data_root = {
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60 "type": data_type,
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61 "data": data
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62 }
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63 self.sendMessage(json.dumps(data_root, ensure_ascii=False).encode())
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64
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65 def close(self) -> None:
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66 log.debug(f"closing websocket for profile {self.__profile}")
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67
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68 def error(self, error_type: str, msg: str) -> None:
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69 """Send an error message to frontend and log it locally"""
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70 log.warning(
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71 f"websocket error {error_type}: {msg}"
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72 )
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73 self.send("error", {
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74 "type": error_type,
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75 "msg": msg,
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76 })
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77
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78 def onConnect(self, request):
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79 if "libervia-page" not in request.protocols:
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80 raise types.ConnectionDeny(
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81 types.ConnectionDeny.NOT_IMPLEMENTED, "No supported protocol"
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82 )
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83 self._init_ok = False
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84 cookies = {}
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85 for cookie in request.headers.get("cookie", "").split(";"):
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86 k, __, v = cookie.partition("=")
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87 cookies[k.strip()] = v.strip()
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88 session_uid = (
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89 cookies.get("TWISTED_SECURE_SESSION")
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90 or cookies.get("TWISTED_SESSION")
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91 or ""
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92 )
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93 if not session_uid:
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94 raise types.ConnectionDeny(
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95 types.ConnectionDeny.FORBIDDEN, "No session set"
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96 )
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97 try:
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98 session = host.site.getSession(session_uid.encode())
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99 except KeyError:
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100 raise types.ConnectionDeny(
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101 types.ConnectionDeny.FORBIDDEN, "Invalid session"
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102 )
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103
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104 session.touch()
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105 session_data = session.getComponent(session_iface.IWebSession)
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106 if session_data.ws_socket is not None:
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107 log.warning(f"Session socket is already set {session_data.ws_socket=} {self=}], force closing it")
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108 try:
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109 session_data.ws_socket.send(
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110 "force_close", {"reason": "duplicate connection detected"}
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111 )
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112 except Exception as e:
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113 log.warning(f"Can't force close old connection: {e}")
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114 session_data.ws_socket = self
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115 self.__session = session_data
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116 self.__profile = session_data.profile or C.SERVICE_PROFILE
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117 log.debug(f"websocket connection connected for profile {self.__profile}")
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118 return "libervia-page"
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119
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120 def on_open(self):
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121 log.debug("websocket connection opened")
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122
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123 def onMessage(self, payload: bytes, isBinary: bool) -> None:
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124 if self.__session is None:
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125 raise exceptions.InternalError("empty session, this should never happen")
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126 try:
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127 data_full = json.loads(payload.decode())
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128 data_type = data_full["type"]
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129 data = data_full["data"]
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130 except ValueError as e:
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131 self.error(
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132 "bad_request",
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133 f"Not valid JSON, ignoring data ({e}): {payload!r}"
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134 )
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135 return
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136 except KeyError:
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137 self.error(
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138 "bad_request",
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139 'Invalid request (missing "type" or "data")'
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140 )
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141 return
1504
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142
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143 if data_type == "init":
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144 if self._init_ok:
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Goffi <goffi@goffi.org>
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145 self.error(
409d10211b20 server, browser: dynamic pages refactoring:
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parents: 1396
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146 "bad_request",
409d10211b20 server, browser: dynamic pages refactoring:
Goffi <goffi@goffi.org>
parents: 1396
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147 "double init"
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148 )
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149 self.sendClose(4400, "Bad Request")
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150 return
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151
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152 try:
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153 profile = data["profile"] or C.SERVICE_PROFILE
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Goffi <goffi@goffi.org>
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154 token = data["token"]
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155 except KeyError:
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156 self.error(
409d10211b20 server, browser: dynamic pages refactoring:
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157 "bad_request",
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158 "Invalid init data (missing profile or token)"
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159 )
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160 self.sendClose(4400, "Bad Request")
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161 return
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162 if ((
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163 profile != self.__profile
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164 or (token != self.__session.ws_token and profile != C.SERVICE_PROFILE)
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165 )):
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166 log.debug(
409d10211b20 server, browser: dynamic pages refactoring:
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167 f"profile got {profile}, was expecting {self.__profile}, "
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168 f"token got {token}, was expecting {self.__session.ws_token}, "
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169 )
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170 self.error(
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171 "Unauthorized",
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172 "Invalid profile or token"
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Goffi <goffi@goffi.org>
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diff changeset
173 )
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174 self.sendClose(4401, "Unauthorized")
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175 return
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diff changeset
176 else:
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177 log.debug(f"websocket connection initialized for {profile}")
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178 self._init_ok = True
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179 # we now send all cached data, if any
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180 while True:
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181 try:
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182 session_kw = self.__session.ws_buffer.popleft()
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183 except IndexError:
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184 break
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185 else:
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186 self.send(**session_kw)
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187
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188 if not self._init_ok:
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189 self.error(
409d10211b20 server, browser: dynamic pages refactoring:
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190 "Unauthorized",
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191 "session not authorized"
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Goffi <goffi@goffi.org>
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192 )
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193 self.sendClose(4401, "Unauthorized")
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194 return
995
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parents:
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195
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Goffi <goffi@goffi.org>
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196 def on_close(self, wasClean, code, reason):
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197 log.debug(f"closing websocket (profile: {self.__profile}, reason: {reason})")
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198 if self.__profile is None:
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199 log.error("self.__profile should not be None")
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200 self.__profile = C.SERVICE_PROFILE
995
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parents:
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201
1504
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202 if self.__session is None:
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203 log.warning("closing a socket without attached session")
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204 elif self.__session.ws_socket != self:
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205 log.error("session socket is not linked to our instance")
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206 else:
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207 log.debug(f"reseting websocket session for {self.__profile}")
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208 self.__session.ws_socket = None
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209 sessions = session_iface.WebSession.get_profile_sessions(self.__profile)
1504
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210 log.debug(f"websocket connection for profile {self.__profile} closed")
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211 self.__profile = None
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212
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diff changeset
213 @classmethod
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214 def get_base_url(cls, secure):
1504
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215 return "ws{sec}://localhost:{port}".format(
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216 sec="s" if secure else "",
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217 port=host.options["port_https" if secure else "port"],
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Goffi <goffi@goffi.org>
parents: 1054
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218 )
995
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Goffi <goffi@goffi.org>
parents:
diff changeset
219
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parents:
diff changeset
220 @classmethod
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Goffi <goffi@goffi.org>
parents: 1506
diff changeset
221 def get_resource(cls, secure):
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parents: 1506
diff changeset
222 factory = websocket.WebSocketServerFactory(cls.get_base_url(secure))
995
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parents:
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223 factory.protocol = cls
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parents:
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224 return resource.WebSocketResource(factory)