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annotate mod_json_streams/mod_json_streams.lua @ 349:ee99eafdd168

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mod_json_streams: An implementation of XEP-0295: JSON Encodings for XMPP.
author Waqas Hussain <waqas20@gmail.com>
date Sat, 02 Apr 2011 00:04:26 +0500
parents
children 98569ec25ac2
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rev   line source
349
ee99eafdd168 mod_json_streams: An implementation of XEP-0295: JSON Encodings for XMPP.
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1 --
ee99eafdd168 mod_json_streams: An implementation of XEP-0295: JSON Encodings for XMPP.
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2 -- XEP-0295: JSON Encodings for XMPP
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3 --
ee99eafdd168 mod_json_streams: An implementation of XEP-0295: JSON Encodings for XMPP.
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4
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5 module.host = "*"
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6
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7 local filters = require "util.filters"
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8 local json = require "util.json"
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9
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10 local json_escapes = {
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11 ["\""] = "\\\"", ["\\"] = "\\\\", ["\b"] = "\\b", ["\f"] = "\\f",
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12 ["\n"] = "\\n", ["\r"] = "\\r", ["\t"] = "\\t"};
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13
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14 local s_char = string.char;
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15 for i=0,31 do
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16 local ch = s_char(i);
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17 if not json_escapes[ch] then json_escapes[ch] = ("\\u%.4X"):format(i); end
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18 end
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20 local state_out = 0;
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21 local state_key_before = 1;
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22 local state_key_in = 2;
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23 local state_key_escape = 3;
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24 local state_key_after = 4;
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25 local state_val_before = 5;
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26 local state_val_in = 6;
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27 local state_val_escape = 7;
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28 local state_val_after = 8;
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29
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30 local whitespace = { [" "] = true, ["\n"] = true, ["\r"] = true, ["\t"] = true };
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31 function json_decoder()
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32 local state = state_out;
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33 local quote;
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34 local output = "";
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35 local buffer = "";
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36 return function(input)
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37 for ch in input:gmatch(".") do
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38 module:log("debug", "%s | %d", ch, state)
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39 local final = false;
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40 if state == state_out then
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41 if whitespace[ch] then
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42 elseif ch ~= "{" then return nil, "{ expected";
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43 else state = state_key_before end
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44 elseif state == state_key_before then
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45 if whitespace[ch] then
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46 elseif ch ~= "'" and ch ~= "\"" then return nil, "\" expected";
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47 else quote = ch; state = state_key_in; end
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48 elseif state == state_key_in then
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49 if ch == quote then state = state_key_after;
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50 elseif ch ~= "s" then return nil, "invalid key, 's' expected"; -- only s as key allowed
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51 else end -- ignore key
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52 elseif state == state_key_after then
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53 if whitespace[ch] then
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54 elseif ch ~= ":" then return nil, ": expected";
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55 else state = state_val_before; end
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56 elseif state == state_val_before then
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57 if whitespace[ch] then
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58 elseif ch ~= "'" and ch ~= "\"" then return nil, "\" expected";
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59 else quote = ch; state = state_val_in; end
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60 elseif state == state_val_in then
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61 if ch == quote then state = state_val_after;
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62 elseif ch == "\\" then state = state_val_escape;
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63 else end
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64 elseif state == state_val_after then
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65 if whitespace[ch] then
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66 elseif ch ~= "}" then return nil, "} expected";
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67 else state = state_out;
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68 final = true;
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69 end
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70 elseif state == state_val_escape then
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71 state = state_val_in;
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72 else
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73 module:log("error", "Unhandled state: "..state);
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74 return nil, "Unhandled state in parser"
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75 end
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76 buffer = buffer..ch;
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77 if final then
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78 module:log("debug", "%s", buffer)
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79 local tmp;
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80 pcall(function() tmp = json.decode(buffer); end);
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81 if not tmp then return nil, "Invalid JSON"; end
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82 output, buffer = output..tmp.s, "";
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83 end
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84 end
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85 local _ = output; output = "";
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86 return _;
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87 end;
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88 end
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89
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90 function filter_hook(session)
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91 local determined = false;
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92 local is_json = false;
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93 local function in_filter(t)
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94 if not determined then
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95 is_json = (t:sub(1,1) == "{") and json_decoder();
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96 determined = true;
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97 end
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98 if is_json then
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99 local s, err = is_json(t);
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100 if not err then return s; end
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101 session:close("not-well-formed");
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102 return;
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103 end
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104 return t;
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105 end
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106 local function out_filter(t)
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107 if is_json then
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108 return '{"s":"' .. t:gsub(".", json_escapes) .. '"}'; -- encode
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109 end
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110 return t;
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111 end
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112 filters.add_filter(session, "bytes/in", in_filter, 100);
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113 filters.add_filter(session, "bytes/out", out_filter, 100);
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114 end
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115
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116 function module.load()
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117 filters.add_filter_hook(filter_hook);
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118 end
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Waqas Hussain <waqas20@gmail.com>
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119 function module.unload()
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120 filters.remove_filter_hook(filter_hook);
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Waqas Hussain <waqas20@gmail.com>
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121 end
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Waqas Hussain <waqas20@gmail.com>
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122
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123