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annotate mod_firewall/actions.lib.lua @ 1268:854a3933cfcd

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mod_muc_log_http: URL-encode room names. This allows special characters in room names to work. Ideally this escaping shouldn’t be done in the user visible content, but the module’s template system doesn’t currently allow that.
author Waqas Hussain <waqas20@gmail.com>
date Sat, 04 Jan 2014 16:50:57 -0500
parents f0108ec2b016
children 8a3f3f485675
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 local action_handlers = {};
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2
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3
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4 -- Run code through this to allow strings to contain code. e.g.: LOG=Received: $(stanza:top_tag())
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5 local function meta(s, extra)
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6 return (s:gsub("$(%b())", [["..%1.."]])
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7 :gsub("$(%b<>)", [["..stanza:find("%1").."]])
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8 :gsub("$$(%a+)", extra or {}));
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9 end
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10
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11 -- Takes an XML string and returns a code string that builds that stanza
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12 -- using st.stanza()
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13 local function compile_xml(data)
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14 local code = {};
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15 local first, short_close = true, nil;
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16 for tagline, text in data:gmatch("<([^>]+)>([^<]*)") do
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17 if tagline:sub(-1,-1) == "/" then
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18 tagline = tagline:sub(1, -2);
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19 short_close = true;
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20 end
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21 if tagline:sub(1,1) == "/" then
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22 code[#code+1] = (":up()");
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23 else
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24 local name, attr = tagline:match("^(%S*)%s*(.*)$");
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25 local attr_str = {};
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26 for k, _, v in attr:gmatch("(%S+)=([\"'])([^%2]-)%2") do
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27 if #attr_str == 0 then
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28 table.insert(attr_str, ", { ");
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29 else
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30 table.insert(attr_str, ", ");
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31 end
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32 if k:match("^%a%w*$") then
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33 table.insert(attr_str, string.format("%s = %q", k, v));
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34 else
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35 table.insert(attr_str, string.format("[%q] = %q", k, v));
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36 end
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37 end
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38 if #attr_str > 0 then
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39 table.insert(attr_str, " }");
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40 end
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41 if first then
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42 code[#code+1] = (string.format("st.stanza(%q %s)", name, #attr_str>0 and table.concat(attr_str) or ", nil"));
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43 first = nil;
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44 else
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45 code[#code+1] = (string.format(":tag(%q%s)", name, table.concat(attr_str)));
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46 end
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47 end
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48 if text and text:match("%S") then
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49 code[#code+1] = (string.format(":text(%q)", text));
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50 elseif short_close then
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51 short_close = nil;
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52 code[#code+1] = (":up()");
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53 end
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54 end
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55 return table.concat(code, "");
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56 end
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57
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9b21b91c2d96 mod_firewall/actions: Add PASS
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58 function action_handlers.PASS()
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59 return "do return end"
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60 end
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62 function action_handlers.DROP()
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843795020701 mod_firewall/actions: DROP no longer logs, log messages can be emitted with LOG
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63 return "do return true end";
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64 end
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65
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66 function action_handlers.STRIP(tag_desc)
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67 local code = {};
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68 local name, xmlns = tag_desc:match("^(%S+) (.+)$");
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69 if not name then
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70 name, xmlns = tag_desc, nil;
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71 end
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72 if name == "*" then
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73 name = nil;
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74 end
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75 code[#code+1] = ("local stanza_xmlns = stanza.attr.xmlns; ");
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76 code[#code+1] = "stanza:maptags(function (tag) if ";
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77 if name then
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78 code[#code+1] = ("tag.name == %q and "):format(name);
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79 end
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80 if xmlns then
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81 code[#code+1] = ("(tag.attr.xmlns or stanza_xmlns) == %q "):format(xmlns);
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82 else
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83 code[#code+1] = ("tag.attr.xmlns == stanza_xmlns ");
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84 end
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85 code[#code+1] = "then return nil; end return tag; end );";
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86 return table.concat(code);
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87 end
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88
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89 function action_handlers.INJECT(tag)
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90 return "stanza:add_child("..compile_xml(tag)..")", { "st" };
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91 end
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92
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93 local error_types = {
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94 ["bad-request"] = "modify";
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95 ["conflict"] = "cancel";
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96 ["feature-not-implemented"] = "cancel";
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97 ["forbidden"] = "auth";
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98 ["gone"] = "cancel";
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99 ["internal-server-error"] = "cancel";
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100 ["item-not-found"] = "cancel";
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101 ["jid-malformed"] = "modify";
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102 ["not-acceptable"] = "modify";
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103 ["not-allowed"] = "cancel";
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104 ["not-authorized"] = "auth";
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105 ["payment-required"] = "auth";
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106 ["policy-violation"] = "modify";
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107 ["recipient-unavailable"] = "wait";
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108 ["redirect"] = "modify";
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109 ["registration-required"] = "auth";
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110 ["remote-server-not-found"] = "cancel";
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111 ["remote-server-timeout"] = "wait";
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112 ["resource-constraint"] = "wait";
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113 ["service-unavailable"] = "cancel";
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114 ["subscription-required"] = "auth";
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115 ["undefined-condition"] = "cancel";
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116 ["unexpected-request"] = "wait";
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117 };
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118
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119
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120 local function route_modify(make_new, to, drop)
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121 local reroute, deps = "session.send(newstanza)", { "st" };
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122 if to then
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123 reroute = ("newstanza.attr.to = %q; core_post_stanza(session, newstanza)"):format(to);
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124 deps[#deps+1] = "core_post_stanza";
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125 end
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b729414b4bf1 mod_firewall/actions: Move semicolon as to not produce two in a row. (Not legal in Lua)
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126 return ([[local newstanza = st.%s; %s; %s ]])
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127 :format(make_new, reroute, drop and "return true;" or ""), deps;
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128 end
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129
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130 function action_handlers.BOUNCE(with)
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131 local error = with and with:match("^%S+") or "service-unavailable";
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132 local error_type = error:match(":(%S+)");
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133 if not error_type then
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134 error_type = error_types[error] or "cancel";
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135 else
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136 error = error:match("^[^:]+");
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137 end
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138 error, error_type = string.format("%q", error), string.format("%q", error_type);
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139 local text = with and with:match(" %((.+)%)$");
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140 if text then
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141 text = string.format("%q", text);
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142 else
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143 text = "nil";
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144 end
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145 return route_modify(("error_reply(stanza, %s, %s, %s)"):format(error_type, error, text), nil, true);
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146 end
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147
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148 function action_handlers.REDIRECT(where)
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149 return route_modify("clone(stanza)", where, true);
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150 end
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151
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152 function action_handlers.COPY(where)
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153 return route_modify("clone(stanza)", where, false);
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154 end
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155
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156 function action_handlers.REPLY(with)
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157 return route_modify(("reply(stanza):body(%q)"):format(with));
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158 end
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159
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160 function action_handlers.LOG(string)
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161 local level = string:match("^%[(%a+)%]") or "info";
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162 string = string:gsub("^%[%a+%] ?", "");
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f0108ec2b016 mod_firewall/actions: Break out logic into a separate reusable function
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parents: 960
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163 return meta(("log(%q, %q)"):format(level, string));
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164 end
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165
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166 function action_handlers.RULEDEP(dep)
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167 return "", { dep };
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168 end
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169
960
d773a51af9b1 mod_firewall: Add actions EVENT (fire an event), JUMP EVENT (transfer control to the handlers of an event), JUMP CHAIN (transfer control to another mod_firewall chain)
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parents: 959
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170 function action_handlers.EVENT(name)
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171 return ("fire_event(%q, event)"):format(name);
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parents: 959
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172 end
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173
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174 function action_handlers.JUMP_EVENT(name)
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175 return ("do return fire_event(%q, event); end"):format(name);
d773a51af9b1 mod_firewall: Add actions EVENT (fire an event), JUMP EVENT (transfer control to the handlers of an event), JUMP CHAIN (transfer control to another mod_firewall chain)
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parents: 959
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176 end
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177
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178 function action_handlers.JUMP_CHAIN(name)
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parents: 959
diff changeset
179 return ("do return fire_event(%q, event); end"):format("firewall/chains/"..name);
d773a51af9b1 mod_firewall: Add actions EVENT (fire an event), JUMP EVENT (transfer control to the handlers of an event), JUMP CHAIN (transfer control to another mod_firewall chain)
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parents: 959
diff changeset
180 end
d773a51af9b1 mod_firewall: Add actions EVENT (fire an event), JUMP EVENT (transfer control to the handlers of an event), JUMP CHAIN (transfer control to another mod_firewall chain)
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parents: 959
diff changeset
181
947
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182 return action_handlers;