prosody-modules
8064b5e346ab
mod_json_streams/mod_json_streams.lua

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mod_json_streams/mod_json_streams.lua @ 1893:8064b5e346ab

mod_pubsub_feeds/README: Update wording to be clearer
author Kim Alvefur <zash@zash.se>
date Sat, 03 Oct 2015 16:53:45 +0200
parent 350:98569ec25ac2
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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
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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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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