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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 request_pt = {}
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112 request_mt = { __index = request_pt }
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113
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114 function request_pt:_init(handler, options)
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115 -- process options:
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116 options = options or {}
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117 do
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118 -- named arg "static_headers" is used to create the preamble:
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119 local s = options.static_headers
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120 local t = {}
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121 if s then
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122 if type(s) == "string" then
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123 for line in string.gmatch(s, "[^\r\n]+") do
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124 t[#t+1] = line
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125 end
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126 else
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127 for i, kv in ipairs(options.static_headers) do
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128 if type(kv) == "string" then
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129 t[#t+1] = kv
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130 else
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131 t[#t+1] = kv[1] .. ": " .. kv[2]
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132 end
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133 end
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134 end
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135 end
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136 t[#t+1] = ""
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137 self._preamble = table.concat(t, "\r\n") -- preamble sent with every(!) HTTP response
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138 end
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139 self._input_chunk_size = options.maximum_input_chunk_size or options.chunk_size or 16384
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140 self._output_chunk_size = options.minimum_output_chunk_size or options.chunk_size or 1024
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141 self._header_size_limit = options.header_size_limit or 1024*1024
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142 local function init_timeout(name, default)
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143 local value = options[name]
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144 if value == nil then
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145 self["_"..name] = default
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146 else
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147 self["_"..name] = value or 0
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148 end
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149 end
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150 init_timeout("request_idle_timeout", 330)
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151 init_timeout("request_header_timeout", 30)
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152 init_timeout("request_body_timeout", 1800)
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153 init_timeout("response_timeout", 1830)
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154 self._poll = options.poll_function or moonbridge_io.poll
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155 self:_create_closure("_write_yield")
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156 self:_create_closure("_handler")
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157 -- table mapping header field names to value-lists:
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158 self._headers_mt = {
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159 __index = function(tbl, key)
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160 local lowerkey = string.lower(key)
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161 local result = self._headers[lowerkey]
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162 if result == nil then
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163 result = {}
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164 end
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165 tbl[lowerkey] = result
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166 tbl[key] = result
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167 return result
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168 end
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169 }
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170 -- table mapping header field names to value-lists
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171 -- (for headers with comma separated values):
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172 self._headers_csv_table_mt = {
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173 __index = function(tbl, key)
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174 local result = {}
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175 for i, line in ipairs(self.headers[key]) do
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176 for entry in string.gmatch(line, "[^,]+") do
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177 local value = string.match(entry, "^[ \t]*(..-)[ \t]*$")
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178 if value then
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179 result[#result+1] = value
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180 end
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181 end
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182 end
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183 tbl[key] = result
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184 return result
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185 end
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186 }
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187 -- table mapping header field names to a comma separated string
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188 -- (for headers with comma separated values):
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189 self._headers_csv_string_mt = {
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190 __index = function(tbl, key)
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191 local result = {}
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192 for i, line in ipairs(self.headers[key]) do
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193 result[#result+1] = line
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194 end
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195 result = string.concat(result, ", ")
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196 tbl[key] = result
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197 return result
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198 end
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199 }
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200 -- table mapping header field names to a single string value
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201 -- (or false if header has been sent multiple times):
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202 self._headers_value_mt = {
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203 __index = function(tbl, key)
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204 if self._headers_value_nil[key] then
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205 return nil
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206 end
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207 local result = nil
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208 local values = self.headers_csv_table[key]
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209 if #values == 0 then
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210 self._headers_value_nil[key] = true
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211 elseif #values == 1 then
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212 result = values[1]
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213 else
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214 result = false
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215 end
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216 tbl[key] = result
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217 return result
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218 end
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219 }
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220 -- table mapping header field names to a flag table,
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221 -- indicating if the comma separated value contains certain entries:
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222 self._headers_flags_mt = {
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223 __index = function(tbl, key)
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224 local result = setmetatable({}, {
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225 __index = function(tbl, key)
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226 local lowerkey = string.lower(key)
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227 local result = rawget(tbl, lowerkey) or false
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228 tbl[lowerkey] = result
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229 tbl[key] = result
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230 return result
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231 end
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232 })
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233 for i, value in ipairs(self.headers_csv_table[key]) do
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234 result[string.lower(value)] = true
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235 end
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236 tbl[key] = result
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237 return result
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238 end
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239 }
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240 end
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241
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242 function request_pt:_create_closure(name)
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243 self[name.."_closure"] = function(...)
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244 return self[name](self, ...)
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245 end
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246 end
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247
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248 function request_pt:_create_magictable(name)
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249 self[name] = setmetatable({}, self["_"..name.."_mt"])
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250 end
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251
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252 function request_pt:_handler(socket)
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253 self._socket = socket
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254 self._survive = true
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255 self._socket_set = {[socket] = true}
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256 self._faulty = false
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257 self._consume_input = self._drain_input
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258 self._headers = {}
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259 self._headers_value_nil = {}
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260 self:_create_magictable("headers")
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261 self:_create_magictable("headers_csv_table")
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262 self:_create_magictable("headers_csv_string")
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263 self:_create_magictable("headers_value")
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264 self:_create_magictable("headers_flags")
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265 repeat
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266 -- wait for input:
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267 if not moonbridge_io.poll(self._socket_set, nil, self._request_idle_timeout) then
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268 self:_error("408 Request Timeout", "Idle connection timed out")
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269 return self._survive
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270 end
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271 -- read headers (with timeout):
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272 do
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273 local coro = coroutine.wrap(self._read_headers)
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274 local timeout = self._request_header_timeout
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275 local starttime = timeout and moonbridge_io.timeref()
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276 while true do
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277 local status = coro(self)
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278 if status == nil then
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279 local remaining
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280 if timeout then
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281 remaining = timeout - moonbridge_io.timeref(starttime)
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282 end
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283 if not self._poll(self._socket_set, nil, remaining) then
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284 self:_error("408 Request Timeout", "Timeout while receiving headers")
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285 return self._survive
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286 end
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287 elseif status == false then
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288 return self._survive
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289 elseif status == true then
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290 break
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291 else
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292 error("Unexpected yield value")
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293 end
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294 end
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295 end
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296 until true
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297 end
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298
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299 function request_pt:_error(status, explanation)
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300 end
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301
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302 function request_pt:_read(...)
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303 local line, status = self._socket:read_yield(...)
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304 if line == nil then
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305 self._faulty = true
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306 error(status)
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307 else
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308 return line, status
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309 end
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310 end
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311
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312 function request_pt:_read_headers()
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313 local remaining = self._header_size_limit
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314 -- read and parse request line:
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315 local target, proto
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316 do
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317 local line, status = self:_read(remaining-2, "\n")
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318 if status == "maxlen" then
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319 self:_error("414 Request-URI Too Long")
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320 return false
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321 elseif status == "eof" then
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322 if line ~= "" then
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323 self:_error("400 Bad Request", "Unexpected EOF in request-URI line")
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324 end
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325 return false
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326 end
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327 remaining = remaining - #line
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328 self.method, target, proto =
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329 line:match("^([^ \t\r]+)[ \t]+([^ \t\r]+)[ \t]*([^ \t\r]*)[ \t]*\r?\n$")
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330 if not request.method then
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331 self:_error("400 Bad Request", "Invalid request-URI line")
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332 return false
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333 elseif proto ~= "HTTP/1.1" then
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334 self:_error("505 HTTP Version Not Supported")
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335 return false
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336 end
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337 end
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jbe@154
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338 -- read and parse headers:
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339 while true do
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340 local line, status = self:_read(remaining, "\n");
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341 if status == "maxlen" then
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342 self:_error("431 Request Header Fields Too Large")
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343 return false
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344 elseif status == "eof" then
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345 self:_error("400 Bad Request", "Unexpected EOF in request headers")
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346 return false
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347 end
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jbe@154
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348 remaining = remaining - #line
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349 if line == "\r\n" or line == "\n" then
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350 break
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351 end
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jbe@154
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352 local key, value = string.match(line, "^([^ \t\r]+):[ \t]*(.-)[ \t]*\r?\n$")
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353 if not key then
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354 self:_error("400 Bad Request", "Invalid header line")
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355 return false
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356 end
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357 local lowerkey = key:lower()
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358 local values = self._headers[lowerkey]
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359 if values then
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360 values[#values+1] = value
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361 else
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362 self._headers[lowerkey] = {value}
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363 end
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364 end
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jbe@154
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365 -- process "Connection: close" header if existent:
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366 self._connection_close_requested = self.headers_flags["Connection"]["close"]
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367 -- process "Content-Length" header if existent:
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368 do
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jbe@154
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369 local values = self.headers_csv_table["Content-Length"]
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jbe@154
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370 if #values > 0 then
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jbe@154
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371 self._request_body_content_length = tonumber(values[1])
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jbe@154
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372 local proper_value = tostring(request_body_content_length)
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jbe@154
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373 for i, value in ipairs(values) do
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jbe@154
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374 value = string.match(value, "^0*(.*)")
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jbe@154
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375 if value ~= proper_value then
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jbe@154
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376 self:_error("400 Bad Request", "Content-Length header(s) invalid")
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jbe@154
|
377 return false
|
jbe@0
|
378 end
|
jbe@38
|
379 end
|
jbe@154
|
380 if request_body_content_length > self._body_size_limit then
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jbe@154
|
381 self:_error("413 Request Entity Too Large", "Announced request body size is too big")
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jbe@154
|
382 return false
|
jbe@38
|
383 end
|
jbe@154
|
384 end
|
jbe@154
|
385 end
|
jbe@154
|
386 -- process "Transfer-Encoding" header if existent:
|
jbe@154
|
387 do
|
jbe@154
|
388 local flag = self.headers_flags["Transfer-Encoding"]["chunked"]
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jbe@154
|
389 local list = self.headers_csv_table["Transfer-Encoding"]
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jbe@154
|
390 if (flag and #list ~= 1) or (not flag and #list ~= 0) then
|
jbe@154
|
391 self:_error("400 Bad Request", "Unexpected Transfer-Encoding")
|
jbe@154
|
392 return false
|
jbe@154
|
393 end
|
jbe@154
|
394 end
|
jbe@154
|
395 -- process "Expect" header if existent:
|
jbe@154
|
396 for i, value in ipairs(self.headers_csv_table["Expect"]) do
|
jbe@154
|
397 if string.lower(value) ~= "100-continue" then
|
jbe@154
|
398 self:_error("417 Expectation Failed", "Unexpected Expect header")
|
jbe@154
|
399 return false
|
jbe@154
|
400 end
|
jbe@154
|
401 end
|
jbe@154
|
402 -- get mandatory Host header according to RFC 7230:
|
jbe@154
|
403 self.host = self.headers_value["Host"]
|
jbe@154
|
404 if not self.host then
|
jbe@154
|
405 self:_error("400 Bad Request", "No valid host header")
|
jbe@154
|
406 return false
|
jbe@154
|
407 end
|
jbe@154
|
408 -- parse request target:
|
jbe@154
|
409 self.path, self.query = string.match(target, "^/([^?]*)(.*)$")
|
jbe@154
|
410 if not self.path then
|
jbe@154
|
411 local host2
|
jbe@154
|
412 host2, self.path, self.query = string.match(target, "^[Hh][Tt][Tt][Pp]://([^/?]+)/?([^?]*)(.*)$")
|
jbe@154
|
413 if host2 then
|
jbe@154
|
414 if self.host ~= host2 then
|
jbe@154
|
415 self:_error("400 Bad Request", "No valid host header")
|
jbe@154
|
416 return false
|
jbe@38
|
417 end
|
jbe@154
|
418 elseif not (target == "*" and self.method == "OPTIONS") then
|
jbe@154
|
419 self:_error("400 Bad Request", "Invalid request target")
|
jbe@154
|
420 end
|
jbe@154
|
421 end
|
jbe@154
|
422 -- parse GET params:
|
jbe@154
|
423 if self.query then
|
jbe@154
|
424 self.get_params_list = read_urlencoded_form(request.query)
|
jbe@154
|
425 self.get_params = get_first_values(self.get_params_list)
|
jbe@154
|
426 end
|
jbe@154
|
427 -- parse cookies:
|
jbe@154
|
428 for i, line in ipairs(self.headers["Cookie"]) do
|
jbe@154
|
429 for rawkey, rawvalue in
|
jbe@154
|
430 string.gmatch(line, "([^=; ]*)=([^=; ]*)")
|
jbe@154
|
431 do
|
jbe@154
|
432 self.cookies[decode_uri(rawkey)] = decode_uri(rawvalue)
|
jbe@154
|
433 end
|
jbe@0
|
434 end
|
jbe@0
|
435 end
|
jbe@0
|
436
|
jbe@154
|
437 function request_pt:_assert_not_faulty()
|
jbe@154
|
438 assert(not self._faulty, "Tried to use faulty request handle")
|
jbe@154
|
439 end
|
jbe@154
|
440
|
jbe@154
|
441 function request_pt:_write_yield()
|
jbe@154
|
442 self:_consume_input()
|
jbe@154
|
443 self._poll(self._socket_set, self._socket_set)
|
jbe@154
|
444 end
|
jbe@154
|
445
|
jbe@154
|
446 function request_pt:_write(...)
|
jbe@154
|
447 assert(self._socket:write_call(self._write_yield_closure, ...))
|
jbe@154
|
448 end
|
jbe@154
|
449
|
jbe@154
|
450 function request_pt:_flush(...)
|
jbe@154
|
451 assert(self._socket:write_call(self._write_yield_closure, ...))
|
jbe@154
|
452 end
|
jbe@154
|
453
|
jbe@154
|
454 function request_pt:_drain_input()
|
jbe@154
|
455 socket:drain_nb(self._input_chunk_size)
|
jbe@154
|
456 end
|
jbe@154
|
457
|
jbe@154
|
458
|
jbe@154
|
459 -- function creating a HTTP handler:
|
jbe@154
|
460 function generate_handler(handler, options)
|
jbe@154
|
461 -- swap arguments if necessary (for convenience):
|
jbe@154
|
462 if type(handler) ~= "function" and type(options) == "function" then
|
jbe@154
|
463 handler, options = options, handler
|
jbe@154
|
464 end
|
jbe@154
|
465 local request = setmetatable({}, request_mt)
|
jbe@154
|
466 request:_init(handler, options)
|
jbe@154
|
467 return request._handler_closure
|
jbe@154
|
468 end
|
jbe@154
|
469
|
jbe@0
|
470 return _M
|
jbe@0
|
471
|