prosody-modules
14a3f5223074
mod_xhtmlim/mod_xhtmlim.lua

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mod_xhtmlim/mod_xhtmlim.lua @ 4080:14a3f5223074

mod_invites: Whitespace (from Snikket)
author Matthew Wild <mwild1@gmail.com>
date Mon, 07 Sep 2020 13:03:08 +0100
parent 3699:1f68287138e3
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
2865
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
1 -- XEP-0071: XHTML-IM sanitizing
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
2
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
3 local assert = assert;
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
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4
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
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5 local st = require "util.stanza";
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
6 local url = require "socket.url";
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
7
3699
1f68287138e3 mod_xhtmlim: Default to stripping @style attribute by default
Kim Alvefur <zash@zash.se>
parents: 3404
diff changeset
8 local no_styles = module:get_option_boolean("strip_xhtml_style", true);
2865
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
9
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
10 -- Tables from XEP-0071
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
11 local xeptables = [[
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
12 <body/> class, id, title; style
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
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13 <head/> profile
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
14 <html/> version
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
15 <title/>
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
16 <abbr/> class, id, title; style
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
17 <acronym/> class, id, title; style
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
18 <address/> class, id, title; style
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
19 <blockquote/> class, id, title; style; cite
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
20 <br/> class, id, title; style
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
21 <cite/> class, id, title; style
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
22 <code/> class, id, title; style
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
23 <dfn/> class, id, title; style
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
24 <div/> class, id, title; style
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
25 <em/> class, id, title; style
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
26 <h1/> class, id, title; style
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
27 <h2/> class, id, title; style
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
28 <h3/> class, id, title; style
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
29 <h4/> class, id, title; style
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
30 <h5/> class, id, title; style
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
31 <h6/> class, id, title; style
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
32 <kbd/> class, id, title; style
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
33 <p/> class, id, title; style
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
34 <pre/> class, id, title; style
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
35 <q/> class, id, title; style; cite
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
36 <samp/> class, id, title; style
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
37 <span/> class, id, title; style
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
38 <strong/> class, id, title; style
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
39 <var/> class, id, title; style
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
40 <a/> class, id, title; style; accesskey, charset, href, hreflang, rel, rev, tabindex, type
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
41 <dl/> class, id, title; style
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
42 <dt/> class, id, title; style
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
43 <dd/> class, id, title; style
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
44 <ol/> class, id, title; style
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
45 <ul/> class, id, title; style
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
46 <li/> class, id, title; style
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
47 <img/> class, id, title; style; alt, height, longdesc, src, width
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
48 ]];
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
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49
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
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50 -- map of whitelisted tag names to set of allowed attributes
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
51 local tags = {}; -- { string : { string : boolean } }
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
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52
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
53 for tag, attrs in xeptables:gmatch("<(%w+)/>([^\n]*)") do
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
54 tags[tag] = { xmlns = true, ["xml:lang"] = true };
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
55 for attr in attrs:gmatch("%w+") do
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
56 tags[tag][attr] = true;
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
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57 end
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
58 if no_styles then
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
59 tags[tag]["style"] = nil;
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
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60 end
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
61 end
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
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62
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
63 -- module:log("debug", "tags = %s;", require "util.serialization".serialize(tags));
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
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64
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
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65 -- TODO Decide if disallowed tags should be bounced or silently discarded.
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
66 -- XEP says "ignore" and replace tag with text content, but that would
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
67 -- need a different transform which can't use `maptags`.
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
68 if not module:get_option_boolean("bounce_invalid_xhtml", false) then
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
69 assert = function (x) return x end
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
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70 end
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
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71
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
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72 local function sanitize_xhtml(tag)
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
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73 -- module:log("debug", "sanitize_xhtml(<{%s}%s>)", tag.attr.xmlns, tag.name);
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
74 if tag.attr.xmlns == "http://www.w3.org/1999/xhtml" then
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
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75 local allowed = assert(tags[tag.name], tag.name);
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
76 if allowed then
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
77 for attr, value in pairs(tag.attr) do
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
78 if not allowed[attr] then
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
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79 -- module:log("debug", "Removing disallowed attribute %q from <%s>", attr, tag.name);
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
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80 tag.attr[attr] = nil;
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
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81 elseif attr == "src" or attr == "href" then
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
82 local urlattr = url.parse(value);
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
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83 local scheme = urlattr and urlattr.scheme;
2866
276f7af8afd1 mod_xhtmlim: Fix scheme check (thanks wiktor)
Kim Alvefur <zash@zash.se>
parents: 2865
diff changeset
84 if scheme ~= "http" and scheme ~= "https" and scheme ~= "mailto" and scheme ~= "xmpp" and scheme ~= "cid" then
2865
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
85 tag.attr[attr] = "https://url.was.invalid/";
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Kim Alvefur <zash@zash.se>
parents:
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86 end
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
87 end
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
88 end
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Kim Alvefur <zash@zash.se>
parents:
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89 else
3404
6444fb5dbb51 mod_xhtmlim: Turn unknown elements into <span>
Kim Alvefur <zash@zash.se>
parents: 2866
diff changeset
90 tag.name = "span"
6444fb5dbb51 mod_xhtmlim: Turn unknown elements into <span>
Kim Alvefur <zash@zash.se>
parents: 2866
diff changeset
91 tag.attr = { xmlns = "http://www.w3.org/1999/xhtml" }
2865
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
92 end
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
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93 -- Check child tags
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
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94 tag:maptags(sanitize_xhtml);
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
95 -- This tag is clean!
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
96 return tag;
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
97 end
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
98 -- Not xhtml, probably best to discard it
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
99 return nil;
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
100 end
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
101
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
102 -- Check for xhtml-im, sanitize if exists
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
103 local function message_handler(event)
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
104 local stanza = event.stanza;
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
105 if stanza:get_child("html", "http://jabber.org/protocol/xhtml-im") then
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
106 stanza = st.clone(stanza);
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
107 if pcall(function() -- try
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
108 stanza:get_child("html", "http://jabber.org/protocol/xhtml-im"):maptags(sanitize_xhtml);
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
109 end) then
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
110 event.stanza = stanza;
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
111 else -- catch
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
112 if stanza.attr.type ~= "error" then
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
113 event.origin.send(st.error_reply(stanza, "modify", "not-acceptable", "Stanza contained illegal XHTML-IM tag"));
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
114 end
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
115 return true;
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
116 end
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
117 end
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
118 end
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
119
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
120 -- Stanzas received from clients
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
121 module:hook("pre-message/bare", message_handler, 71);
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
122 module:hook("pre-message/full", message_handler, 71);
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
123 module:hook("pre-message/host", message_handler, 71);
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
124
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
125 -- Stanzas about to be delivered to clients
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
126 module:hook("message/bare", message_handler, 71);
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
127 module:hook("message/full", message_handler, 71);