--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libervia/backend/tools/common/uri.py	Fri Jun 02 11:49:51 2023 +0200
@@ -0,0 +1,121 @@
+#!/usr/bin/env python3
+
+
+# SAT: a jabber client
+# Copyright (C) 2009-2021 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/>.
+
+""" XMPP uri parsing tools """
+
+from typing import Optional
+import sys
+import urllib.parse
+import urllib.request, urllib.parse, urllib.error
+
+# FIXME: basic implementation, need to follow RFC 5122
+
+
+def parse_xmpp_uri(uri):
+    """Parse an XMPP uri and return a dict with various information
+
+    @param uri(unicode): uri to parse
+    @return dict(unicode, unicode): data depending of the URI where key can be:
+        type: one of ("pubsub", TODO)
+            type is always present
+        sub_type: can be:
+            - microblog
+            only used for pubsub for now
+        path: XMPP path (jid of the service or entity)
+        node: node used
+        id: id of the element (item for pubsub)
+    @raise ValueError: the scheme is not xmpp
+    """
+    uri_split = urllib.parse.urlsplit(uri)
+    if uri_split.scheme != "xmpp":
+        raise ValueError("this is not a XMPP URI")
+
+    # XXX: we don't use jid.JID for path as it can be used both in backend and frontend
+    # which may use different JID classes
+    data = {"path": urllib.parse.unquote(uri_split.path)}
+
+    query_end = uri_split.query.find(";")
+    if query_end == -1:
+        # we just have a JID
+        query_type = None
+    else:
+        query_type = uri_split.query[:query_end]
+        if "=" in query_type:
+            raise ValueError("no query type, invalid XMPP URI")
+
+    if sys.version_info >= (3, 9):
+        # parse_qs behaviour has been modified in Python 3.9, ";" is not understood as a
+        # parameter separator anymore but the "separator" argument has been added to
+        # change it.
+        pairs = urllib.parse.parse_qs(uri_split.geturl(), separator=";")
+    else:
+        pairs = urllib.parse.parse_qs(uri_split.geturl())
+    for k, v in list(pairs.items()):
+        if len(v) != 1:
+            raise NotImplementedError("multiple values not managed")
+        if k in ("path", "type", "sub_type"):
+            raise NotImplementedError("reserved key used in URI, this is not supported")
+        data[k] = urllib.parse.unquote(v[0])
+
+    if query_type:
+        data["type"] = query_type
+    elif "node" in data:
+        data["type"] = "pubsub"
+    else:
+        data["type"] = ""
+
+    if "node" in data:
+        if data["node"].startswith("urn:xmpp:microblog:"):
+            data["sub_type"] = "microblog"
+
+    return data
+
+
+def add_pairs(uri, pairs):
+    for k, v in pairs.items():
+        uri.append(
+            ";"
+            + urllib.parse.quote_plus(k.encode("utf-8"))
+            + "="
+            + urllib.parse.quote_plus(v.encode("utf-8"))
+        )
+
+
+def build_xmpp_uri(type_: Optional[str] = None, **kwargs: str) -> str:
+    uri = ["xmpp:"]
+    subtype = kwargs.pop("subtype", None)
+    path = kwargs.pop("path")
+    uri.append(urllib.parse.quote_plus(path.encode("utf-8")).replace("%40", "@"))
+
+    if type_ is None:
+        # we have an URI to a JID
+        if kwargs:
+            raise NotImplementedError(
+                "keyword arguments are not supported for URI without type"
+            )
+    elif type_ == "pubsub":
+        if subtype == "microblog" and not kwargs.get("node"):
+            kwargs["node"] = "urn:xmpp:microblog:0"
+        if kwargs:
+            uri.append("?")
+            add_pairs(uri, kwargs)
+    else:
+        raise NotImplementedError("{type_} URI are not handled yet".format(type_=type_))
+
+    return "".join(uri)