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mod_firewall/actions.lib.lua @ 1211:27de4109b7e9
mod_http_altconnect: Exposes BOSH and WebSocket endpoints over HTTP per http://legastero.github.io/customxeps/extensions/xep-0156.html#http
author | Kim Alvefur <zash@zash.se> |
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date | Sun, 13 Oct 2013 04:47:51 +0200 |
parent | 961:f0108ec2b016 |
child | 1303:8a3f3f485675 |
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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58 function action_handlers.PASS() |
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59 return "do return end" |
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60 end |
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61 |
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62 function action_handlers.DROP() |
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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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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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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 |
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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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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); |
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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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179 return ("do return fire_event(%q, event); end"):format("firewall/chains/"..name); |
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180 end |
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181 |
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182 return action_handlers; |