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mod_xhtmlim/mod_xhtmlim.lua @ 4282:281a864e7472
mod_pubsub_feeds: Don't skip publishing items after an existing one
I encountered a feed which was backwards, such that older entries were
considered first and then it would skip newer entries.
This may however run into trouble if the feed contains more items than
what's persisted in pubsub.
author | Kim Alvefur <zash@zash.se> |
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date | Mon, 30 Nov 2020 15:17:29 +0100 |
parent | 3699:1f68287138e3 |
rev | line source |
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1 -- XEP-0071: XHTML-IM sanitizing |
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2 |
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3 local assert = assert; |
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4 |
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5 local st = require "util.stanza"; |
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6 local url = require "socket.url"; |
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7 |
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8 local no_styles = module:get_option_boolean("strip_xhtml_style", true); |
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9 |
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10 -- Tables from XEP-0071 |
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11 local xeptables = [[ |
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12 <body/> class, id, title; style |
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13 <head/> profile |
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14 <html/> version |
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15 <title/> |
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16 <abbr/> class, id, title; style |
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17 <acronym/> class, id, title; style |
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18 <address/> class, id, title; style |
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19 <blockquote/> class, id, title; style; cite |
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20 <br/> class, id, title; style |
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21 <cite/> class, id, title; style |
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22 <code/> class, id, title; style |
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23 <dfn/> class, id, title; style |
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24 <div/> class, id, title; style |
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25 <em/> class, id, title; style |
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26 <h1/> class, id, title; style |
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27 <h2/> class, id, title; style |
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28 <h3/> class, id, title; style |
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29 <h4/> class, id, title; style |
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30 <h5/> class, id, title; style |
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31 <h6/> class, id, title; style |
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32 <kbd/> class, id, title; style |
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33 <p/> class, id, title; style |
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34 <pre/> class, id, title; style |
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35 <q/> class, id, title; style; cite |
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36 <samp/> class, id, title; style |
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37 <span/> class, id, title; style |
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38 <strong/> class, id, title; style |
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39 <var/> class, id, title; style |
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40 <a/> class, id, title; style; accesskey, charset, href, hreflang, rel, rev, tabindex, type |
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41 <dl/> class, id, title; style |
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42 <dt/> class, id, title; style |
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43 <dd/> class, id, title; style |
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44 <ol/> class, id, title; style |
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45 <ul/> class, id, title; style |
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46 <li/> class, id, title; style |
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47 <img/> class, id, title; style; alt, height, longdesc, src, width |
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48 ]]; |
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49 |
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50 -- map of whitelisted tag names to set of allowed attributes |
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51 local tags = {}; -- { string : { string : boolean } } |
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52 |
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53 for tag, attrs in xeptables:gmatch("<(%w+)/>([^\n]*)") do |
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54 tags[tag] = { xmlns = true, ["xml:lang"] = true }; |
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55 for attr in attrs:gmatch("%w+") do |
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56 tags[tag][attr] = true; |
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57 end |
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58 if no_styles then |
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59 tags[tag]["style"] = nil; |
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60 end |
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61 end |
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62 |
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63 -- module:log("debug", "tags = %s;", require "util.serialization".serialize(tags)); |
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64 |
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65 -- TODO Decide if disallowed tags should be bounced or silently discarded. |
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66 -- XEP says "ignore" and replace tag with text content, but that would |
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67 -- need a different transform which can't use `maptags`. |
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68 if not module:get_option_boolean("bounce_invalid_xhtml", false) then |
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69 assert = function (x) return x end |
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70 end |
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71 |
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72 local function sanitize_xhtml(tag) |
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73 -- module:log("debug", "sanitize_xhtml(<{%s}%s>)", tag.attr.xmlns, tag.name); |
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74 if tag.attr.xmlns == "http://www.w3.org/1999/xhtml" then |
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75 local allowed = assert(tags[tag.name], tag.name); |
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76 if allowed then |
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77 for attr, value in pairs(tag.attr) do |
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78 if not allowed[attr] then |
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79 -- module:log("debug", "Removing disallowed attribute %q from <%s>", attr, tag.name); |
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80 tag.attr[attr] = nil; |
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81 elseif attr == "src" or attr == "href" then |
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82 local urlattr = url.parse(value); |
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83 local scheme = urlattr and urlattr.scheme; |
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84 if scheme ~= "http" and scheme ~= "https" and scheme ~= "mailto" and scheme ~= "xmpp" and scheme ~= "cid" then |
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85 tag.attr[attr] = "https://url.was.invalid/"; |
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86 end |
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87 end |
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88 end |
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89 else |
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90 tag.name = "span" |
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91 tag.attr = { xmlns = "http://www.w3.org/1999/xhtml" } |
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92 end |
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93 -- Check child tags |
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94 tag:maptags(sanitize_xhtml); |
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95 -- This tag is clean! |
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96 return tag; |
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97 end |
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98 -- Not xhtml, probably best to discard it |
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99 return nil; |
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100 end |
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101 |
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102 -- Check for xhtml-im, sanitize if exists |
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103 local function message_handler(event) |
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104 local stanza = event.stanza; |
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105 if stanza:get_child("html", "http://jabber.org/protocol/xhtml-im") then |
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106 stanza = st.clone(stanza); |
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107 if pcall(function() -- try |
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108 stanza:get_child("html", "http://jabber.org/protocol/xhtml-im"):maptags(sanitize_xhtml); |
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109 end) then |
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110 event.stanza = stanza; |
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111 else -- catch |
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112 if stanza.attr.type ~= "error" then |
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113 event.origin.send(st.error_reply(stanza, "modify", "not-acceptable", "Stanza contained illegal XHTML-IM tag")); |
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114 end |
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115 return true; |
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116 end |
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117 end |
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118 end |
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119 |
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120 -- Stanzas received from clients |
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121 module:hook("pre-message/bare", message_handler, 71); |
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122 module:hook("pre-message/full", message_handler, 71); |
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123 module:hook("pre-message/host", message_handler, 71); |
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124 |
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125 -- Stanzas about to be delivered to clients |
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126 module:hook("message/bare", message_handler, 71); |
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127 module:hook("message/full", message_handler, 71); |