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annotate libervia/backend/tools/common/regex.py @ 4306:94e0968987cd

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plugin XEP-0033: code modernisation, improve delivery, data validation: - Code has been rewritten using Pydantic models and `async` coroutines for data validation and cleaner element parsing/generation. - Delivery has been completely rewritten. It now works even if server doesn't support multicast, and send to local multicast service first. Delivering to local multicast service first is due to bad support of XEP-0033 in server (notably Prosody which has an incomplete implementation), and the current impossibility to detect if a sub-domain service handles fully multicast or only for local domains. This is a workaround to have a good balance between backward compatilibity and use of bandwith, and to make it work with the incoming email gateway implementation (the gateway will only deliver to entities of its own domain). - disco feature checking now uses `async` corountines. `host` implementation still use Deferred return values for compatibility with legacy code. rel 450
author Goffi <goffi@goffi.org>
date Thu, 26 Sep 2024 16:12:01 +0200
parents 0d7bb4df2343
children
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1 #!/usr/bin/env python3
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2
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4 # Salut à Toi: an XMPP client
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5 # Copyright (C) 2009-2021 Jérôme Poisson (goffi@goffi.org)
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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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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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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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20 """ regex tools common to backend and frontends """
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21
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22 import re
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23 import unicodedata
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25 path_escape = {"%": "%25", "/": "%2F", "\\": "%5c"}
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26 path_escape_rev = {re.escape(v): k for k, v in path_escape.items()}
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27 path_escape = {re.escape(k): v for k, v in path_escape.items()}
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28 #  thanks to Martijn Pieters (https://stackoverflow.com/a/14693789)
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29 RE_ANSI_REMOVE = re.compile(r"\x1B(?:[@-Z\\-_]|\[[0-?]*[ -/]*[@-~])")
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30 RE_TEXT_URL = re.compile(r"[^a-zA-Z0-9,_]+")
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31 TEXT_MAX_LEN = 60
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32 # min lenght is currently deactivated
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33 TEXT_WORD_MIN_LENGHT = 0
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35
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36 def re_join(exps):
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37 """Join (OR) various regexes"""
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38 return re.compile("|".join(exps))
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41 def re_sub_dict(pattern, repl_dict, string):
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42 """Replace key, value found in dict according to pattern
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43
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44 @param pattern(basestr): pattern using keys found in repl_dict
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45 @repl_dict(dict): keys found in this dict will be replaced by
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46 corresponding values
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47 @param string(basestr): string to use for the replacement
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48 """
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49 return pattern.sub(lambda m: repl_dict[re.escape(m.group(0))], string)
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52 path_escape_re = re_join(list(path_escape.keys()))
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53 path_escape_rev_re = re_join(list(path_escape_rev.keys()))
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55
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56 def path_escape(string):
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57 """Escape string so it can be use in a file path
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59 @param string(basestr): string to escape
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60 @return (str, unicode): escaped string, usable in a file path
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61 """
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62 return re_sub_dict(path_escape_re, path_escape, string)
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65 def path_unescape(string):
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66 """Unescape string from value found in file path
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68 @param string(basestr): string found in file path
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69 @return (str, unicode): unescaped string
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70 """
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71 return re_sub_dict(path_escape_rev_re, path_escape_rev, string)
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74 def ansi_remove(string):
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75 """Remove ANSI escape codes from string
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77 @param string(basestr): string to filter
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78 @return (str, unicode): string without ANSI escape codes
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79 """
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80 return RE_ANSI_REMOVE.sub("", string)
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82
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83 def url_friendly_text(text):
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84 """Convert text to url-friendly one"""
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85 # we change special chars to ascii one,
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86 # trick found at https://stackoverflow.com/a/3194567
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87 text = unicodedata.normalize("NFD", text).encode("ascii", "ignore").decode("utf-8")
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88 text = RE_TEXT_URL.sub(" ", text).lower()
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89 text = "-".join([t for t in text.split() if t and len(t) >= TEXT_WORD_MIN_LENGHT])
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90 while len(text) > TEXT_MAX_LEN:
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91 if "-" in text:
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92 text = text.rsplit("-", 1)[0]
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93 else:
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94 text = text[:TEXT_MAX_LEN]
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95 return text