annotate sat_frontends/tools/jid.py @ 4067:3f62c2445df1

plugin XEP-0339: "Source-Specific Media Attributes in Jingle" implementation: rel 439
author Goffi <goffi@goffi.org>
date Thu, 01 Jun 2023 20:53:33 +0200
parents 199473ffe4ea
children
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1 #!/usr/bin/env python3
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2
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3 # Libervia XMPP
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4 # Copyright (C) 2009-2023 Jérôme Poisson (goffi@goffi.org)
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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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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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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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19 from typing import Optional, Tuple
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22 class JID(str):
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23 """This class helps manage JID (<local>@<domain>/<resource>)"""
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24
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25 def __new__(cls, jid_str: str) -> "JID":
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26 return str.__new__(cls, cls._normalize(jid_str))
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28 def __init__(self, jid_str: str):
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29 self._node, self._domain, self._resource = self._parse()
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31 @staticmethod
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32 def _normalize(jid_str: str) -> str:
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33 """Naive normalization before instantiating and parsing the JID"""
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34 if not jid_str:
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35 return jid_str
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36 tokens = jid_str.split("/")
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37 tokens[0] = tokens[0].lower() # force node and domain to lower-case
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38 return "/".join(tokens)
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40 def _parse(self) -> Tuple[Optional[str], str, Optional[str]]:
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41 """Find node, domain, and resource from JID"""
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42 node_end = self.find("@")
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43 if node_end < 0:
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44 node_end = 0
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45 domain_end = self.find("/")
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46 if domain_end == 0:
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47 raise ValueError("a jid can't start with '/'")
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48 if domain_end == -1:
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49 domain_end = len(self)
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50 node = self[:node_end] or None
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51 domain = self[(node_end + 1) if node_end else 0 : domain_end]
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52 resource = self[domain_end + 1 :] or None
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53 return node, domain, resource
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54
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55 @property
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56 def node(self) -> Optional[str]:
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57 return self._node
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58
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59 @property
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60 def local(self) -> Optional[str]:
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61 return self._node
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62
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63 @property
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64 def domain(self) -> str:
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65 return self._domain
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66
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67 @property
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68 def resource(self) -> Optional[str]:
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69 return self._resource
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70
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71 @property
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72 def bare(self) -> "JID":
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73 if not self.node:
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74 return JID(self.domain)
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75 return JID(f"{self.node}@{self.domain}")
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76
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77 def change_resource(self, resource: str) -> "JID":
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78 """Build a new JID with the same node and domain but a different resource.
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79
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80 @param resource: The new resource for the JID.
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81 @return: A new JID instance with the updated resource.
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82 """
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83 return JID(f"{self.bare}/{resource}")
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84
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85 def is_valid(self) -> bool:
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86 """
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87 @return: True if the JID is XMPP compliant
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88 """
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89 # Simple check for domain part
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90 if not self.domain or self.domain.startswith(".") or self.domain.endswith("."):
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91 return False
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92 if ".." in self.domain:
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93 return False
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94 return True
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95
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96
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97 def new_resource(entity: JID, resource: str) -> JID:
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98 """Build a new JID from the given entity and resource.
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99
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100 @param entity: original JID
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101 @param resource: new resource
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102 @return: a new JID instance
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103 """
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104 return entity.change_resource(resource)