Mercurial > prosody-modules
annotate mod_xhtmlim/mod_xhtmlim.lua @ 5608:1893ae742f66
mod_http_oauth2: Show errors on device flow user code entry page
If the user enters the code incorrectly, having to click back to try
again is no fun. Instead, show the error and the code entry form again.
author | Kim Alvefur <zash@zash.se> |
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date | Wed, 19 Jul 2023 13:05:47 +0200 |
parents | 1f68287138e3 |
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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); |