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util/xml.lua

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util/xml.lua @ 12251:21ed12cfe300

util.pluginloader: Support for a per-file load filter Load filters can choose to block the loading of certain files, and optionally return some metadata about the loaded file.
author Matthew Wild <mwild1@gmail.com>
date Thu, 03 Feb 2022 12:56:52 +0000
parent 12203:320de3e4b579
child 12270:c78639ee6ccb
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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 handler.ProcessingInstruction = restricted_handler;
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76 if not options or not options.allow_comments then
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77 -- NOTE: comments are generally harmless and can be useful when parsing configuration files or other data, even user-provided data
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78 handler.Comment = restricted_handler;
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79 end
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80 local parser = lxp.new(handler, ns_separator);
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81 local ok, err, line, col = parser:parse(xml);
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82 if ok then ok, err, line, col = parser:parse(); end
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83 --parser:close();
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84 if ok then
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85 return stanza.tags[1];
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86 else
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87 return ok, ("%s (line %d, col %d))"):format(err, line, col);
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88 end
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89 end;
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90 end)();
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91
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92 return {
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93 parse = parse_xml;
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94 };