Mercurial > prosody-modules

annotate mod_json_streams/mod_json_streams.lua @ 3656:3e0f4d727825

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mod_vcard_muc: Add an alternative method of signaling avatar change When the avatar has been changed, a signal is sent that the room configuration has changed. Clients then do a disco#info query to find the SHA-1 of the new avatar. They can then fetch it as before, or not if they have it cached already. This is meant to be less disruptive than signaling via presence, which caused problems for some clients. If clients transition to the new method, the old one can eventually be removed. The namespace is made up while waiting for standardization. Otherwise it is very close to what's described in https://xmpp.org/extensions/inbox/muc-avatars.html
author Kim Alvefur <zash@zash.se>
date Sun, 25 Aug 2019 20:46:43 +0200
parents 98569ec25ac2
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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