prosody
f33887f925e1
util/xml.lua

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util/xml.lua @ 12828:f33887f925e1

net.server_epoll: Remove delay on last main loop iteration when quitting Main difference is that timers are not checked unconditionally before each poll, only when running out of previous poll results (hidden by util.poll). This removes a final poll at shutdown that usually delays the 'not quitting' condition check by one second.
author Kim Alvefur <zash@zash.se>
date Fri, 06 Jan 2023 04:38:39 +0100
parent 12270:c78639ee6ccb
child 12975:d10957394a3c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1
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2 local st = require "util.stanza";
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3 local lxp = require "lxp";
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4 local t_insert = table.insert;
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5 local t_remove = table.remove;
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6 local error = error;
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7
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8 local _ENV = nil;
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9 -- luacheck: std none
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11 local parse_xml = (function()
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12 local ns_prefixes = {
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13 ["http://www.w3.org/XML/1998/namespace"] = "xml";
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14 };
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15 local ns_separator = "\1";
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16 local ns_pattern = "^([^"..ns_separator.."]*)"..ns_separator.."?(.*)$";
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17 return function(xml, options)
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18 --luacheck: ignore 212/self
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19 local handler = {};
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20 local stanza = st.stanza("root");
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21 local namespaces = {};
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22 local prefixes = {};
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23 function handler:StartNamespaceDecl(prefix, url)
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24 if prefix ~= nil then
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25 t_insert(namespaces, url);
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26 t_insert(prefixes, prefix);
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27 end
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28 end
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29 function handler:EndNamespaceDecl(prefix)
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30 if prefix ~= nil then
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31 -- we depend on each StartNamespaceDecl having a paired EndNamespaceDecl
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32 t_remove(namespaces);
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33 t_remove(prefixes);
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34 end
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35 end
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36 function handler:StartElement(tagname, attr)
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37 local curr_ns,name = tagname:match(ns_pattern);
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38 if name == "" then
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39 curr_ns, name = "", curr_ns;
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40 end
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41 if curr_ns ~= "" then
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42 attr.xmlns = curr_ns;
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43 end
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44 for i=1,#attr do
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45 local k = attr[i];
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46 attr[i] = nil;
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47 local ns, nm = k:match(ns_pattern);
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48 if nm ~= "" then
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49 ns = ns_prefixes[ns];
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50 if ns then
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51 attr[ns..":"..nm] = attr[k];
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52 attr[k] = nil;
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53 end
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54 end
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55 end
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56 local n = {}
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57 for i=1,#namespaces do
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58 n[prefixes[i]] = namespaces[i];
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59 end
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60 stanza:tag(name, attr, n);
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61 end
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62 function handler:CharacterData(data)
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63 stanza:text(data);
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64 end
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65 function handler:EndElement()
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66 stanza:up();
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67 end
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68 -- SECURITY: These two handlers, especially the Doctype one, are required to prevent exploits such as Billion Laughs.
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69 local function restricted_handler(parser)
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70 if not parser.stop or not parser:stop() then
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71 error("Failed to abort parsing");
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72 end
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73 end
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74 handler.StartDoctypeDecl = restricted_handler;
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75 if not options or not options.allow_comments then
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76 -- NOTE: comments are generally harmless and can be useful when parsing configuration files or other data, even user-provided data
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77 handler.Comment = restricted_handler;
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78 end
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79 if not options or not options.allow_processing_instructions then
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80 -- Processing instructions should generally be safe to just ignore
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81 handler.ProcessingInstruction = restricted_handler;
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82 end
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83 local parser = lxp.new(handler, ns_separator);
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84 local ok, err, line, col = parser:parse(xml);
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85 if ok then ok, err, line, col = parser:parse(); end
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86 --parser:close();
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87 if ok then
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88 return stanza.tags[1];
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89 else
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90 return ok, ("%s (line %d, col %d))"):format(err, line, col);
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91 end
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92 end;
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93 end)();
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94
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95 return {
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96 parse = parse_xml;
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97 };