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1 #!/usr/bin/env lua
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2
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3 -- module preamble
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4 local _G, _M = _ENV, {}
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5 _ENV = setmetatable({}, {
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6 __index = function(self, key)
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7 local value = _M[key]; if value ~= nil then return value end
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8 return _G[key]
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9 end,
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10 __newindex = _M
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11 })
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12
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13 -- function that encodes certain HTML entities:
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14 -- (not used by the library itself)
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15 function encode_html(text)
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16 return (
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17 string.gsub(
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18 text, '[<>&"]',
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19 function(char)
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20 if char == '<' then
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21 return "<"
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22 elseif char == '>' then
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23 return ">"
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24 elseif char == '&' then
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25 return "&"
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26 elseif char == '"' then
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27 return """
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28 end
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29 end
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30 )
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31 )
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32
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33 end
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34
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35 -- function that encodes special characters for URIs:
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36 -- (not used by the library itself)
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37 function encode_uri(text)
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38 return (
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39 string.gsub(text, "[^0-9A-Za-z_%.~-]",
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40 function (char)
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41 return string.format("%%%02x", string.byte(char))
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42 end
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43 )
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44 )
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45 end
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46
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47 -- function undoing URL encoding:
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48 do
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49 local b0 = string.byte("0")
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50 local b9 = string.byte("9")
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51 local bA = string.byte("A")
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52 local bF = string.byte("F")
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53 local ba = string.byte("a")
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54 local bf = string.byte("f")
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55 function decode_uri(str)
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56 return (
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57 string.gsub(
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58 string.gsub(str, "%+", " "),
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59 "%%([0-9A-Fa-f][0-9A-Fa-f])",
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60 function(hex)
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61 local n1, n2 = string.byte(hex, 1, 2)
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62 if n1 >= b0 and n1 <= b9 then n1 = n1 - b0
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63 elseif n1 >= bA and n1 <= bF then n1 = n1 - bA + 10
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64 elseif n1 >= ba and n1 <= bf then n1 = n1 - ba + 10
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65 else error("Assertion failed") end
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66 if n2 >= b0 and n2 <= b9 then n2 = n2 - b0
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67 elseif n2 >= bA and n2 <= bF then n2 = n2 - bA + 10
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68 elseif n2 >= ba and n2 <= bf then n2 = n2 - ba + 10
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69 else error("Assertion failed") end
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70 return string.char(n1 * 16 + n2)
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71 end
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72 )
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73 )
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74 end
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75 end
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76
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77 -- status codes that carry no response body (in addition to 1xx):
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78 -- (set to "zero_content_length" if Content-Length header is required)
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79 status_without_response_body = {
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80 ["101"] = true, -- list 101 to allow protocol switch
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81 ["204"] = true,
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82 ["205"] = "zero_content_length",
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83 ["304"] = true
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84 }
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85
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86 -- parses URL encoded form data:
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87 local function read_urlencoded_form(data)
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88 local tbl = {}
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89 for rawkey, rawvalue in string.gmatch(data, "([^?=&]*)=([^?=&]*)") do
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90 local key = decode_uri(rawkey)
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91 local value = decode_uri(rawvalue)
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92 local subtbl = tbl[key]
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93 if subtbl then
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94 subtbl[#subtbl+1] = value
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95 else
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96 tbl[key] = {value}
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97 end
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98 end
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99 return tbl
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100 end
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101
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102 -- extracts first value from each subtable:
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103 local function get_first_values(tbl)
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104 local newtbl = {}
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105 for key, subtbl in pairs(tbl) do
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106 newtbl[key] = subtbl[1]
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107 end
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108 return newtbl
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109 end
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110
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111 function generate_handler(handler, options)
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112 -- swap arguments if necessary (for convenience):
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113 if type(handler) ~= "function" and type(options) == "function" then
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114 handler, options = options, handler
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115 end
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116 -- helper function to process options:
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117 local function default(name, default_value)
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118 local value = options[name]
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119 if value == nil then
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120 return default_value
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121 else
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122 return value or nil
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123 end
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124 end
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125 -- process options:
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126 options = options or {}
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127 local preamble = "" -- preamble sent with every(!) HTTP response
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128 do
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129 -- named arg "static_headers" is used to create the preamble:
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130 local s = options.static_headers
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131 local t = {}
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132 if s then
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133 if type(s) == "string" then
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134 for line in string.gmatch(s, "[^\r\n]+") do
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135 t[#t+1] = line
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136 end
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137 else
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138 for i, kv in ipairs(options.static_headers) do
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139 if type(kv) == "string" then
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140 t[#t+1] = kv
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141 else
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142 t[#t+1] = kv[1] .. ": " .. kv[2]
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143 end
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144 end
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145 end
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146 end
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147 t[#t+1] = ""
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148 preamble = table.concat(t, "\r\n")
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149 end
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150 local input_chunk_size = options.maximum_input_chunk_size or options.chunk_size or 16384
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151 local output_chunk_size = options.minimum_output_chunk_size or options.chunk_size or 1024
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152 local header_size_limit = options.header_size_limit or 1024*1024
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153 local body_size_limit = options.body_size_limit or 64*1024*1024
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154 local request_idle_timeout = default("request_idle_timeout", 330)
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155 local request_header_timeout = default("request_header_timeout", 30)
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156 local request_body_timeout = default("request_body_timeout", 60)
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157 local request_response_timeout = default("request_response_timeout", 1800)
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158 local poll = options.poll_function or moonbridge_io.poll
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159 -- return socket handler:
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160 return function(socket)
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161 local socket_set = {[socket] = true} -- used for poll function
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162 local survive = true -- set to false if process shall be terminated later
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163 local consume -- function that reads some input if possible
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164 -- function that drains some input if possible:
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165 local function drain()
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166 local bytes, status = socket:drain_nb(input_chunk_size)
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167 if not bytes or status == "eof" then
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168 consume = nil
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169 end
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170 end
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171 -- function trying to unblock socket by reading:
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172 local function unblock()
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173 if consume then
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174 poll(socket_set, socket_set)
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175 consume()
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176 else
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177 poll(nil, socket_set)
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178 end
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179 end
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jbe@163
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180 -- function that enforces consumption of all input:
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181 local function consume_all()
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182 while consume do
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183 poll(socket_set, nil)
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184 consume()
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185 end
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186 end
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187 -- handle requests in a loop:
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188 repeat
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189 -- create a new request object:
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190 local request = {
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191 socket = socket,
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192 cookies = {}
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193 }
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194 -- local variables to track the state:
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195 local state = "init" -- one of:
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196 -- "init" (initial state)
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197 -- "prepare" (configureation in preparation)
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198 -- "no_status_sent" (configuration complete)
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199 -- "info_status_sent" (1xx status code has been sent)
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200 -- "bodyless_status_sent" (204/304 status code has been sent)
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201 -- "status_sent" (regular status code has been sent)
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202 -- "headers_sent" (headers have been terminated)
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203 -- "finished" (request has been answered completely)
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204 -- "faulty" (I/O or protocaol error)
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205 local close_requested = false -- "Connection: close" requested
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206 local close_responded = false -- "Connection: close" sent
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207 local content_length = nil -- value of Content-Length header sent
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208 local chunk_parts = {} -- list of chunks to send
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209 local chunk_bytes = 0 -- sum of lengths of chunks to send
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210 -- functions to assert proper output/closing:
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211 local function assert_output(...)
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212 local retval, errmsg = ...
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213 if retval then return ... end
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214 state = "faulty"
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215 socket:reset()
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216 error("Could not send data to client: " .. errmsg)
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217 end
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218 local function assert_close(...)
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219 local retval, errmsg = ...
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220 if retval then return ... end
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221 state = "faulty"
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222 error("Could not finish sending data to client: " .. errmsg)
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223 end
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224 -- function to assert non-faulty handle:
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225 local function assert_not_faulty()
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226 assert(state ~= "faulty", "Tried to use faulty request handle")
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227 end
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jbe@162
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228 -- functions to send data to the browser:
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229 local function send(...)
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230 assert_output(socket:write_call(unblock, ...))
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231 end
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232 local function send_flush(...)
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233 assert_output(socket:flush_call(unblock, ...))
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234 end
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jbe@163
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235 -- function to finish request:
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236 local function finish()
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237 if close_responded then
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238 -- discard any input:
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239 consume = drain
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240 -- close output stream:
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241 send_flush()
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242 assert_close(socket:finish())
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243 -- wait for EOF of peer to avoid immediate TCP RST condition:
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244 consume_all()
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245 -- fully close socket:
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246 assert_close(socket:close())
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247 else
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248 send_flush()
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249 consume_all()
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250 end
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251 end
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jbe@164
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252 -- function that writes out buffered chunks (without flushing the socket):
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253 function send_chunk()
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254 if chunk_bytes > 0 then
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255 assert_output(socket:write(string.format("%x\r\n", chunk_bytes)))
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256 for i = 1, #chunk_parts do -- TODO: evaluated only once?
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257 send(chunk_parts[i])
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258 chunk_parts[i] = nil
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259 end
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260 chunk_bytes = 0
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261 send("\r\n")
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262 end
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263 end
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jbe@164
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264 -- function to prepare (or skip) body processing:
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265 local function prepare()
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jbe@164
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266 assert_not_faulty()
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jbe@162
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267 if state == "prepare" then
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268 error("Unexpected internal status in HTTP engine (recursive prepare)")
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269 elseif state ~= "init" then
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270 return
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271 end
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272 state = "prepare"
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273 -- TODO
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274 state = "no_status_sent"
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275 end
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jbe@163
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276 -- method to ignore input and close connection after response:
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jbe@163
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277 function request:monologue()
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jbe@164
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278 assert_not_faulty()
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jbe@163
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279 if
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280 state == "headers_sent" or
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281 state == "finished"
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282 then
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283 error("All HTTP headers have already been sent")
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284 end
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jbe@164
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285 local old_state = state
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286 state = "faulty"
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jbe@163
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287 consume = drain
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288 close_requested = true
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jbe@164
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289 if old_state == "init" or old_state == "prepare" then -- TODO: ok?
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290 state = "no_status_sent"
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291 else
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292 state = old_state
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293 end
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294 end
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jbe@163
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295 --
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jbe@162
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296 -- method to send a HTTP response status (e.g. "200 OK"):
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jbe@162
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297 function request:send_status(status)
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298 prepare()
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jbe@164
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299 local old_state = state
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jbe@164
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300 state = "faulty"
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jbe@164
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301 if old_state == "info_status_sent" then
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jbe@162
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302 send_flush("\r\n")
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jbe@164
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303 elseif old_state ~= "no_status_sent" then
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jbe@162
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304 error("HTTP status has already been sent")
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jbe@162
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305 end
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jbe@162
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306 local status1 = string.sub(status, 1, 1)
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jbe@162
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307 local status3 = string.sub(status, 1, 3)
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jbe@162
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308 send("HTTP/1.1 ", status, "\r\n", preamble)
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jbe@162
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309 local wrb = status_without_response_body[status3]
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jbe@162
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310 if wrb then
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jbe@162
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311 state = "bodyless_status_sent"
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jbe@162
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312 if wrb == "zero_content_length" then
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jbe@162
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313 request:send_header("Content-Length", 0)
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jbe@162
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314 end
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jbe@162
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315 elseif status1 == "1" then
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jbe@162
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316 state = "info_status_sent"
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jbe@162
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317 else
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jbe@162
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318 state = "status_sent"
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jbe@162
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319 end
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jbe@162
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320 end
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jbe@162
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321 -- method to send a HTTP response header:
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jbe@162
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322 -- (key and value must be provided as separate args)
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jbe@162
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323 function request:send_header(key, value)
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jbe@164
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324 assert_not_faulty()
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jbe@164
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325 if
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jbe@164
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326 state == "init" or
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jbe@164
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327 state == "prepare" or
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jbe@164
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328 state == "no_status_sent"
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jbe@164
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329 then
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jbe@162
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330 error("HTTP status has not been sent yet")
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jbe@162
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331 elseif
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jbe@164
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332 state == "headers_sent" or
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jbe@164
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333 state == "finished"
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jbe@162
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334 then
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jbe@162
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335 error("All HTTP headers have already been sent")
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jbe@162
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336 end
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jbe@162
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337 local key_lower = string.lower(key)
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jbe@162
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338 if key_lower == "content-length" then
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jbe@162
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339 if state == "info_status_sent" then
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jbe@162
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340 error("Cannot set Content-Length for informational status response")
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jbe@162
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341 end
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jbe@162
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342 local cl = assert(tonumber(value), "Invalid content-length")
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jbe@162
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343 if content_length == nil then
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jbe@162
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344 content_length = cl
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jbe@162
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345 elseif content_length == cl then
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jbe@162
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346 return
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jbe@162
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347 else
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jbe@162
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348 error("Content-Length has been set multiple times with different values")
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jbe@162
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349 end
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jbe@162
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350 elseif key_lower == "connection" then
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jbe@162
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351 for entry in string.gmatch(string.lower(value), "[^,]+") do
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jbe@162
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352 if string.match(entry, "^[ \t]*close[ \t]*$") then
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jbe@162
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353 if state == "info_status_sent" then
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jbe@162
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354 error("Cannot set \"Connection: close\" for informational status response")
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jbe@162
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355 end
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jbe@162
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356 close_responded = true
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jbe@162
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357 break
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jbe@162
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358 end
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jbe@162
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359 end
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jbe@162
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360 end
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jbe@162
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361 assert_output(socket:write(key, ": ", value, "\r\n"))
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jbe@162
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362 end
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jbe@162
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363 -- function to terminate header section in response, optionally flushing:
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jbe@162
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364 -- (may be called multiple times unless response is finished)
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jbe@162
|
365 local function finish_headers(with_flush)
|
jbe@162
|
366 if state == "finished" then
|
jbe@162
|
367 error("Response has already been finished")
|
jbe@162
|
368 elseif state == "info_status_sent" then
|
jbe@162
|
369 send_flush("\r\n")
|
jbe@162
|
370 state = "no_status_sent"
|
jbe@162
|
371 elseif state == "bodyless_status_sent" then
|
jbe@162
|
372 if close_requested and not close_responded then
|
jbe@162
|
373 request:send_header("Connection", "close")
|
jbe@162
|
374 end
|
jbe@162
|
375 send("\r\n")
|
jbe@163
|
376 finish()
|
jbe@162
|
377 state = "finished"
|
jbe@162
|
378 elseif state == "status_sent" then
|
jbe@162
|
379 if not content_length then
|
jbe@162
|
380 request:send_header("Transfer-Encoding", "chunked")
|
jbe@162
|
381 end
|
jbe@162
|
382 if close_requested and not close_responded then
|
jbe@162
|
383 request:send_header("Connection", "close")
|
jbe@162
|
384 end
|
jbe@162
|
385 send("\r\n")
|
jbe@162
|
386 if request.method == "HEAD" then
|
jbe@163
|
387 finish()
|
jbe@162
|
388 elseif with_flush then
|
jbe@162
|
389 send_flush()
|
jbe@162
|
390 end
|
jbe@162
|
391 state = "headers_sent"
|
jbe@162
|
392 elseif state ~= "headers_sent" then
|
jbe@162
|
393 error("HTTP status has not been sent yet")
|
jbe@162
|
394 end
|
jbe@162
|
395 end
|
jbe@162
|
396 -- method to finish and flush headers:
|
jbe@162
|
397 function request:finish_headers()
|
jbe@164
|
398 assert_not_faulty()
|
jbe@162
|
399 finish_headers(true)
|
jbe@162
|
400 end
|
jbe@164
|
401 -- method to send body data:
|
jbe@164
|
402 function request:send_data(...)
|
jbe@164
|
403 assert_not_faulty()
|
jbe@164
|
404 if output_state == "info_status_sent" then
|
jbe@164
|
405 error("No (non-informational) HTTP status has been sent yet")
|
jbe@164
|
406 elseif output_state == "bodyless_status_sent" then
|
jbe@164
|
407 error("Cannot send response data for body-less status message")
|
jbe@164
|
408 end
|
jbe@164
|
409 finish_headers(false)
|
jbe@164
|
410 if output_state ~= "headers_sent" then
|
jbe@164
|
411 error("Unexpected internal status in HTTP engine")
|
jbe@164
|
412 end
|
jbe@164
|
413 if request.method == "HEAD" then
|
jbe@164
|
414 return
|
jbe@164
|
415 end
|
jbe@164
|
416 for i = 1, select("#", ...) do
|
jbe@164
|
417 local str = tostring(select(i, ...))
|
jbe@164
|
418 if #str > 0 then
|
jbe@164
|
419 if content_length then
|
jbe@164
|
420 local bytes_to_send = #str
|
jbe@164
|
421 if bytes_sent + bytes_to_send > content_length then
|
jbe@164
|
422 error("Content length exceeded")
|
jbe@164
|
423 else
|
jbe@164
|
424 send(str)
|
jbe@164
|
425 bytes_sent = bytes_sent + bytes_to_send
|
jbe@164
|
426 end
|
jbe@164
|
427 else
|
jbe@164
|
428 chunk_bytes = chunk_bytes + #str
|
jbe@164
|
429 chunk_parts[#chunk_parts+1] = str
|
jbe@164
|
430 end
|
jbe@164
|
431 end
|
jbe@164
|
432 end
|
jbe@164
|
433 if chunk_bytes >= output_chunk_size then
|
jbe@164
|
434 send_chunk()
|
jbe@164
|
435 end
|
jbe@164
|
436 end
|
jbe@163
|
437 -- function to report an error:
|
jbe@163
|
438 local function request_error(throw_error, status, text)
|
jbe@163
|
439 local errmsg = "Error while reading request from client. Error response: " .. status
|
jbe@163
|
440 if text then
|
jbe@163
|
441 errmsg = errmsg .. " (" .. text .. ")"
|
jbe@163
|
442 end
|
jbe@163
|
443 if
|
jbe@163
|
444 state == "init" or
|
jbe@163
|
445 state == "prepare" or
|
jbe@163
|
446 state == "no_status_sent" or
|
jbe@163
|
447 state == "info_status_sent"
|
jbe@163
|
448 then
|
jbe@163
|
449 local error_response_status, errmsg2 = pcall(function()
|
jbe@163
|
450 request:monologue()
|
jbe@163
|
451 request:send_status(status)
|
jbe@163
|
452 request:send_header("Content-Type", "text/plain")
|
jbe@163
|
453 request:send_data(status, "\n")
|
jbe@163
|
454 if text then
|
jbe@163
|
455 request:send_data("\n", text, "\n")
|
jbe@163
|
456 end
|
jbe@163
|
457 request:finish()
|
jbe@163
|
458 end)
|
jbe@163
|
459 if not error_response_status then
|
jbe@163
|
460 error("Unexpected error while sending error response: " .. errmsg2)
|
jbe@163
|
461 end
|
jbe@163
|
462 elseif state ~= "faulty" then
|
jbe@163
|
463 assert_close(socket:reset())
|
jbe@163
|
464 end
|
jbe@163
|
465 if throw_error then
|
jbe@163
|
466 error(errmsg)
|
jbe@163
|
467 else
|
jbe@163
|
468 return survive
|
jbe@163
|
469 end
|
jbe@163
|
470 end
|
jbe@160
|
471 -- wait for input:
|
jbe@160
|
472 if not poll(socket_set, nil, request_idle_timeout) then
|
jbe@163
|
473 return request_error(false, "408 Request Timeout", "Idle connection timed out")
|
jbe@38
|
474 end
|
jbe@162
|
475 until close_responded
|
jbe@0
|
476 return survive
|
jbe@0
|
477 end
|
jbe@0
|
478 end
|
jbe@0
|
479
|
jbe@0
|
480 return _M
|
jbe@0
|
481
|