view libervia/frontends/tools/jid.py @ 4094:c3b68fdc2de7

component AP gateway: fix handling of XMPP comments authors: the gateway was supposing that comments where emitted from PEP of author. While this is the case for most blog posts, it's not for comments. Instead the component is now using `author_jid` which is retrieved by XEP-0277 plugin, and reject the item if the auhor is not verified (i.e. if `publisher` attribute is not set by XMPP service).
author Goffi <goffi@goffi.org>
date Mon, 12 Jun 2023 14:50:43 +0200
parents 26b7ed2817da
children
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#!/usr/bin/env python3

# Libervia XMPP
# Copyright (C) 2009-2023 Jérôme Poisson (goffi@goffi.org)

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.

# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

from typing import Optional, Tuple


class JID(str):
    """This class helps manage JID (<local>@<domain>/<resource>)"""

    def __new__(cls, jid_str: str) -> "JID":
        return str.__new__(cls, cls._normalize(jid_str))

    def __init__(self, jid_str: str):
        self._node, self._domain, self._resource = self._parse()

    @staticmethod
    def _normalize(jid_str: str) -> str:
        """Naive normalization before instantiating and parsing the JID"""
        if not jid_str:
            return jid_str
        tokens = jid_str.split("/")
        tokens[0] = tokens[0].lower()  # force node and domain to lower-case
        return "/".join(tokens)

    def _parse(self) -> Tuple[Optional[str], str, Optional[str]]:
        """Find node, domain, and resource from JID"""
        node_end = self.find("@")
        if node_end < 0:
            node_end = 0
        domain_end = self.find("/")
        if domain_end == 0:
            raise ValueError("a jid can't start with '/'")
        if domain_end == -1:
            domain_end = len(self)
        node = self[:node_end] or None
        domain = self[(node_end + 1) if node_end else 0 : domain_end]
        resource = self[domain_end + 1 :] or None
        return node, domain, resource

    @property
    def node(self) -> Optional[str]:
        return self._node

    @property
    def local(self) -> Optional[str]:
        return self._node

    @property
    def domain(self) -> str:
        return self._domain

    @property
    def resource(self) -> Optional[str]:
        return self._resource

    @property
    def bare(self) -> "JID":
        if not self.node:
            return JID(self.domain)
        return JID(f"{self.node}@{self.domain}")

    def change_resource(self, resource: str) -> "JID":
        """Build a new JID with the same node and domain but a different resource.

        @param resource: The new resource for the JID.
        @return: A new JID instance with the updated resource.
        """
        return JID(f"{self.bare}/{resource}")

    def is_valid(self) -> bool:
        """
        @return: True if the JID is XMPP compliant
        """
        # Simple check for domain part
        if not self.domain or self.domain.startswith(".") or self.domain.endswith("."):
            return False
        if ".." in self.domain:
            return False
        return True


def new_resource(entity: JID, resource: str) -> JID:
    """Build a new JID from the given entity and resource.

    @param entity: original JID
    @param resource: new resource
    @return: a new JID instance
    """
    return entity.change_resource(resource)