Mercurial > prosody-modules
annotate mod_json_streams/mod_json_streams.lua @ 1127:38e56be11584
mod_bidi: Make sessions table weak
author | Kim Alvefur <zash@zash.se> |
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date | Sat, 03 Aug 2013 00:53:09 +0200 |
parents | 98569ec25ac2 |
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rev | line source |
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1 -- |
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2 -- XEP-0295: JSON Encodings for XMPP |
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3 -- |
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4 |
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5 module.host = "*" |
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6 |
350
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7 local httpserver = require "net.httpserver"; |
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8 local filters = require "util.filters" |
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9 local json = require "util.json" |
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10 |
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11 local json_escapes = { |
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12 ["\""] = "\\\"", ["\\"] = "\\\\", ["\b"] = "\\b", ["\f"] = "\\f", |
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13 ["\n"] = "\\n", ["\r"] = "\\r", ["\t"] = "\\t"}; |
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14 |
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15 local s_char = string.char; |
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16 for i=0,31 do |
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17 local ch = s_char(i); |
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18 if not json_escapes[ch] then json_escapes[ch] = ("\\u%.4X"):format(i); end |
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19 end |
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20 |
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21 local state_out = 0; |
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22 local state_key_before = 1; |
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23 local state_key_in = 2; |
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24 local state_key_escape = 3; |
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25 local state_key_after = 4; |
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26 local state_val_before = 5; |
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27 local state_val_in = 6; |
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28 local state_val_escape = 7; |
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29 local state_val_after = 8; |
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30 |
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31 local whitespace = { [" "] = true, ["\n"] = true, ["\r"] = true, ["\t"] = true }; |
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32 function json_decoder() |
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33 local state = state_out; |
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34 local quote; |
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35 local output = ""; |
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36 local buffer = ""; |
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37 return function(input) |
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38 for ch in input:gmatch(".") do |
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39 module:log("debug", "%s | %d", ch, state) |
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40 local final = false; |
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41 if state == state_out then |
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42 if whitespace[ch] then |
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43 elseif ch ~= "{" then return nil, "{ expected"; |
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44 else state = state_key_before end |
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45 elseif state == state_key_before then |
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46 if whitespace[ch] then |
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47 elseif ch ~= "'" and ch ~= "\"" then return nil, "\" expected"; |
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48 else quote = ch; state = state_key_in; end |
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49 elseif state == state_key_in then |
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50 if ch == quote then state = state_key_after; |
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51 elseif ch ~= "s" then return nil, "invalid key, 's' expected"; -- only s as key allowed |
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52 else end -- ignore key |
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53 elseif state == state_key_after then |
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54 if whitespace[ch] then |
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55 elseif ch ~= ":" then return nil, ": expected"; |
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56 else state = state_val_before; end |
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57 elseif state == state_val_before then |
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58 if whitespace[ch] then |
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59 elseif ch ~= "'" and ch ~= "\"" then return nil, "\" expected"; |
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60 else quote = ch; state = state_val_in; end |
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61 elseif state == state_val_in then |
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62 if ch == quote then state = state_val_after; |
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63 elseif ch == "\\" then state = state_val_escape; |
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64 else end |
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65 elseif state == state_val_after then |
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66 if whitespace[ch] then |
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67 elseif ch ~= "}" then return nil, "} expected"; |
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68 else state = state_out; |
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69 final = true; |
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70 end |
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71 elseif state == state_val_escape then |
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72 state = state_val_in; |
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73 else |
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74 module:log("error", "Unhandled state: "..state); |
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75 return nil, "Unhandled state in parser" |
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76 end |
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77 buffer = buffer..ch; |
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78 if final then |
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79 module:log("debug", "%s", buffer) |
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80 local tmp; |
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81 pcall(function() tmp = json.decode(buffer); end); |
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82 if not tmp then return nil, "Invalid JSON"; end |
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83 output, buffer = output..tmp.s, ""; |
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84 end |
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85 end |
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86 local _ = output; output = ""; |
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87 return _; |
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88 end; |
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89 end |
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90 |
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91 function filter_hook(session) |
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92 local determined = false; |
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93 local is_json = false; |
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94 local function in_filter(t) |
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95 if not determined then |
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96 is_json = (t:sub(1,1) == "{") and json_decoder(); |
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97 determined = true; |
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98 end |
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99 if is_json then |
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100 local s, err = is_json(t); |
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101 if not err then return s; end |
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102 session:close("not-well-formed"); |
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103 return; |
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104 end |
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105 return t; |
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106 end |
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107 local function out_filter(t) |
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108 if is_json then |
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109 return '{"s":"' .. t:gsub(".", json_escapes) .. '"}'; -- encode |
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110 end |
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111 return t; |
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112 end |
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113 filters.add_filter(session, "bytes/in", in_filter, 100); |
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114 filters.add_filter(session, "bytes/out", out_filter, 100); |
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115 end |
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116 |
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117 function module.load() |
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118 filters.add_filter_hook(filter_hook); |
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119 end |
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120 function module.unload() |
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121 filters.remove_filter_hook(filter_hook); |
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122 end |
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123 |
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124 function encode(data) |
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125 if type(data) == "string" then |
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126 data = json.encode({ s = data }); |
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127 elseif type(data) == "table" and data.body then |
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128 data.body = json.encode({ s = data.body }); |
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129 data.headers["Content-Type"] = "application/json"; |
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130 end |
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131 return data; |
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132 end |
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133 function handle_request(method, body, request) |
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134 local mod_bosh = modulemanager.get_module("*", "bosh") |
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135 if mod_bosh then |
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136 if body and method == "POST" then |
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137 pcall(function() body = json.decode(body).s; end); |
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138 end |
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139 local _send = request.send; |
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140 function request:send(data) return _send(self, encode(data)); end |
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141 return encode(mod_bosh.handle_request(method, body, request)); |
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142 end |
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143 return "<html><body>mod_bosh not loaded</body></html>"; |
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144 end |
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145 |
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146 local function setup() |
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147 local ports = module:get_option("jsonstreams_ports") or { 5280 }; |
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148 httpserver.new_from_config(ports, handle_request, { base = "jsonstreams" }); |
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149 end |
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150 if prosody.start_time then -- already started |
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151 setup(); |
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152 else |
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153 prosody.events.add_handler("server-started", setup); |
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154 end |