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annotate libervia/backend/tools/common/uri.py @ 4256:c14e904eee13

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core: fix SCRAM challenge parsing.
author Goffi <goffi@goffi.org>
date Sat, 01 Jun 2024 22:35:47 +0200
parents 4b842c1fb686
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #!/usr/bin/env python3
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2
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3
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4 # SAT: a jabber client
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5 # Copyright (C) 2009-2021 Jérôme Poisson (goffi@goffi.org)
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6
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7 # This program is free software: you can redistribute it and/or modify
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8 # it under the terms of the GNU Affero General Public License as published by
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9 # the Free Software Foundation, either version 3 of the License, or
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10 # (at your option) any later version.
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11
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12 # This program is distributed in the hope that it will be useful,
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13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 # GNU Affero General Public License for more details.
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16
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17 # You should have received a copy of the GNU Affero General Public License
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18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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19
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20 """ XMPP uri parsing tools """
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21
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22 from typing import Optional
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23 import sys
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24 import urllib.parse
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25 import urllib.request, urllib.parse, urllib.error
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27 # FIXME: basic implementation, need to follow RFC 5122
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29
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30 def parse_xmpp_uri(uri):
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31 """Parse an XMPP uri and return a dict with various information
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32
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33 @param uri(unicode): uri to parse
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34 @return dict(unicode, unicode): data depending of the URI where key can be:
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35 type: one of ("pubsub", TODO)
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36 type is always present
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37 sub_type: can be:
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38 - microblog
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39 only used for pubsub for now
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40 path: XMPP path (jid of the service or entity)
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41 node: node used
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42 id: id of the element (item for pubsub)
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43 @raise ValueError: the scheme is not xmpp
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44 """
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45 uri_split = urllib.parse.urlsplit(uri)
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46 if uri_split.scheme != "xmpp":
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47 raise ValueError("this is not a XMPP URI")
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48
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49 # XXX: we don't use jid.JID for path as it can be used both in backend and frontend
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50 # which may use different JID classes
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51 data = {"path": urllib.parse.unquote(uri_split.path)}
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52
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53 query_end = uri_split.query.find(";")
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54 if query_end == -1:
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55 # we just have a JID
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56 query_type = None
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57 else:
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58 query_type = uri_split.query[:query_end]
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59 if "=" in query_type:
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60 raise ValueError("no query type, invalid XMPP URI")
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61
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62 if sys.version_info >= (3, 9):
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63 # parse_qs behaviour has been modified in Python 3.9, ";" is not understood as a
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64 # parameter separator anymore but the "separator" argument has been added to
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65 # change it.
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66 pairs = urllib.parse.parse_qs(uri_split.geturl(), separator=";")
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67 else:
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68 pairs = urllib.parse.parse_qs(uri_split.geturl())
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69 for k, v in list(pairs.items()):
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70 if len(v) != 1:
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71 raise NotImplementedError("multiple values not managed")
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72 if k in ("path", "type", "sub_type"):
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73 raise NotImplementedError("reserved key used in URI, this is not supported")
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74 data[k] = urllib.parse.unquote(v[0])
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75
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76 if query_type:
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77 data["type"] = query_type
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78 elif "node" in data:
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79 data["type"] = "pubsub"
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80 else:
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81 data["type"] = ""
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82
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83 if "node" in data:
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84 if data["node"].startswith("urn:xmpp:microblog:"):
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85 data["sub_type"] = "microblog"
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86
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87 return data
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89
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90 def add_pairs(uri, pairs):
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91 for k, v in pairs.items():
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92 uri.append(
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93 ";"
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94 + urllib.parse.quote_plus(k.encode("utf-8"))
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95 + "="
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96 + urllib.parse.quote_plus(v.encode("utf-8"))
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97 )
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98
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99
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100 def build_xmpp_uri(type_: Optional[str] = None, **kwargs: str) -> str:
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101 uri = ["xmpp:"]
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102 subtype = kwargs.pop("subtype", None)
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103 path = kwargs.pop("path")
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104 uri.append(urllib.parse.quote_plus(path.encode("utf-8")).replace("%40", "@"))
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105
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106 if type_ is None:
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107 # we have an URI to a JID
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108 if kwargs:
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109 raise NotImplementedError(
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110 "keyword arguments are not supported for URI without type"
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111 )
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112 elif type_ == "pubsub":
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113 if subtype == "microblog" and not kwargs.get("node"):
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114 kwargs["node"] = "urn:xmpp:microblog:0"
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115 if kwargs:
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116 uri.append("?")
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117 add_pairs(uri, kwargs)
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118 else:
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119 raise NotImplementedError("{type_} URI are not handled yet".format(type_=type_))
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120
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121 return "".join(uri)