prosody-modules
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mod_firewall/conditions.lib.lua

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mod_firewall/conditions.lib.lua @ 964:04e85eb3dfef

mod_firewall/conditions: Default types for message and presence
author Matthew Wild <mwild1@gmail.com>
date Fri, 05 Apr 2013 19:20:05 +0100
parent 963:c7fca2c9e24f
child 965:d4e24fb289c0
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1 local condition_handlers = {};
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2
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3 local jid = require "util.jid";
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4
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5 -- Return a code string for a condition that checks whether the contents
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6 -- of variable with the name 'name' matches any of the values in the
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7 -- comma/space/pipe delimited list 'values'.
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8 local function compile_comparison_list(name, values)
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9 local conditions = {};
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10 for value in values:gmatch("[^%s,|]+") do
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11 table.insert(conditions, ("%s == %q"):format(name, value));
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12 end
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13 return table.concat(conditions, " or ");
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14 end
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15
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16 function condition_handlers.KIND(kind)
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17 return compile_comparison_list("name", kind), { "name" };
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18 end
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19
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20 local wildcard_equivs = { ["*"] = ".*", ["?"] = "." };
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21
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22 local function compile_jid_match_part(part, match)
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23 if not match then
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24 return part.." == nil"
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25 end
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26 local pattern = match:match("<(.*)>");
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27 if pattern then
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28 if pattern == "*" then
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29 return part;
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30 end
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31 if pattern:match("^<.*>$") then
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32 pattern = pattern:match("^<(.*)>$");
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33 else
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34 pattern = pattern:gsub("%p", "%%%0"):gsub("%%(%p)", wildcard_equivs);
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35 end
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36 return ("%s:match(%q)"):format(part, "^"..pattern.."$");
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37 else
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38 return ("%s == %q"):format(part, match);
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39 end
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40 end
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41
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42 local function compile_jid_match(which, match_jid)
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43 local match_node, match_host, match_resource = jid.split(match_jid);
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44 local conditions = {};
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45 conditions[#conditions+1] = compile_jid_match_part(which.."_node", match_node);
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46 conditions[#conditions+1] = compile_jid_match_part(which.."_host", match_host);
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47 if match_resource then
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48 conditions[#conditions+1] = compile_jid_match_part(which.."_resource", match_resource);
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49 end
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50 return table.concat(conditions, " and ");
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51 end
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52
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53 function condition_handlers.TO(to)
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54 return compile_jid_match("to", to), { "split_to" };
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55 end
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56
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57 function condition_handlers.FROM(from)
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58 return compile_jid_match("from", from), { "split_from" };
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59 end
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60
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61 function condition_handlers.TYPE(type)
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62 return compile_comparison_list("(type or (name == 'message' and 'chat') or (name == 'presence' and 'available'))", type), { "type", "name" };
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63 end
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64 end
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65
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66 function condition_handlers.ENTERING(zone)
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67 return ("(zones[%q] and (zones[%q][to_host] or "
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68 .."zones[%q][to] or "
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69 .."zones[%q][bare_to]))"
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70 )
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71 :format(zone, zone, zone, zone), { "split_to", "bare_to" };
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72 end
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73
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74 function condition_handlers.LEAVING(zone)
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75 return ("zones[%q] and (zones[%q][from_host] or "
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76 .."(zones[%q][from] or "
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77 .."zones[%q][bare_from]))")
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78 :format(zone, zone, zone, zone), { "split_from", "bare_from" };
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79 end
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80
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81 function condition_handlers.PAYLOAD(payload_ns)
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82 return ("stanza:get_child(nil, %q)"):format(payload_ns);
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83 end
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84
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85 function condition_handlers.INSPECT(path)
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86 if path:find("=") then
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87 local path, match = path:match("(.-)=(.*)");
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88 return ("stanza:find(%q) == %q"):format(path, match);
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89 end
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90 return ("stanza:find(%q)"):format(path);
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91 end
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92
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93 function condition_handlers.FROM_GROUP(group_name)
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94 return ("group_contains(%q, bare_from)"):format(group_name), { "group_contains", "bare_from" };
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95 end
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96
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97 function condition_handlers.TO_GROUP(group_name)
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98 return ("group_contains(%q, bare_to)"):format(group_name), { "group_contains", "bare_to" };
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99 end
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100
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101 function condition_handlers.FROM_ADMIN_OF(host)
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102 return ("is_admin(bare_from, %s)"):format(host ~= "*" and host or nil), { "is_admin", "bare_from" };
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103 end
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104
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105 function condition_handlers.TO_ADMIN_OF(host)
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106 return ("is_admin(bare_to, %s)"):format(host ~= "*" and host or nil), { "is_admin", "bare_to" };
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107 end
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108
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109 return condition_handlers;