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jbe@0
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1 #!/usr/bin/env lua
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2
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jbe@0
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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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jbe@0
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8 return _G[key]
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9 end,
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10 __newindex = function(self, key, value) _M[key] = value end
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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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jbe@0
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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 -- handling of GET/POST param tables:
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87 local new_params_list -- defined later
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88 do
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89 local params_list_mapping = setmetatable({}, {__mode="k"})
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90 local function nextnonempty(tbl, key)
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91 while true do
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92 key = next(tbl, key)
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93 if key == nil then
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94 return nil
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95 end
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96 local value = tbl[key]
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97 if #value > 0 then
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98 return key, value
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99 end
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100 end
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101 end
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102 local function nextvalue(tbl, key)
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103 key = next(tbl, key)
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104 if key == nil then
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105 return nil
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106 end
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107 return key, tbl[key][1]
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108 end
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109 local params_list_metatable = {
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110 __index = function(self, key)
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111 local tbl = {}
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112 self[key] = tbl
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113 return tbl
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114 end,
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115 __pairs = function(self)
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116 return nextnonempty, self, nil
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117 end
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118 }
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119 local params_metatable = {
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120 __index = function(self, key)
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121 return params_list_mapping[self][key][1]
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122 end,
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123 __newindex = function(self, key, value)
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124 params_list_mapping[self][key] = {value}
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125 end,
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126 __pairs = function(self)
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127 return nextvalue, params_list_mapping[self], nil
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128 end
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129 }
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130 -- returns a table to store key value-list pairs (i.e. multiple values),
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131 -- and a second table automatically mapping keys to the first value
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132 -- using the key value-list pairs in the first table:
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133 new_params_list = function()
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134 local params_list = setmetatable({}, params_list_metatable)
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135 local params = setmetatable({}, params_metatable)
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136 params_list_mapping[params] = params_list
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137 return params_list, params
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138 end
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139 end
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140 -- parses URL encoded form data and stores it in
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141 -- a key value-list pairs structure that has to be
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142 -- previously obtained by calling by new_params_list():
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143 local function read_urlencoded_form(tbl, data)
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144 for rawkey, rawvalue in string.gmatch(data, "([^?=&]*)=([^?=&]*)") do
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145 local subtbl = tbl[decode_uri(rawkey)]
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146 subtbl[#subtbl+1] = decode_uri(rawvalue)
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147 end
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148 end
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149
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150 -- function creating a HTTP handler:
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151 function generate_handler(handler, options)
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152 -- swap arguments if necessary (for convenience):
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153 if type(handler) ~= "function" and type(options) == "function" then
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154 handler, options = options, handler
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155 end
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jbe@0
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156 -- process options:
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157 options = options or {}
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158 local preamble = "" -- preamble sent with every(!) HTTP response
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159 do
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160 -- named arg "static_headers" is used to create the preamble:
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161 local s = options.static_headers
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162 local t = {}
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163 if s then
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164 if type(s) == "string" then
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165 for line in string.gmatch(s, "[^\r\n]+") do
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166 t[#t+1] = line
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167 end
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168 else
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169 for i, kv in ipairs(options.static_headers) do
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170 if type(kv) == "string" then
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171 t[#t+1] = kv
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172 else
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173 t[#t+1] = kv[1] .. ": " .. kv[2]
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174 end
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175 end
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176 end
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177 end
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178 t[#t+1] = ""
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179 preamble = table.concat(t, "\r\n")
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180 end
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jbe@44
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181 local function assert_io(retval, errmsg)
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182 if retval then
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183 return retval
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184 end
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185 if options.io_error_handler then
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186 options.io_error_handler(errmsg)
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187 error(errmsg)
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188 end
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189 error(errmsg, 2)
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190 end
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jbe@44
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191 -- desired chunk sizes:
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192 local input_chunk_size = options.maximum_input_chunk_size or options.chunk_size or 16384
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193 local output_chunk_size = options.minimum_output_chunk_size or options.chunk_size or 1024
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194 -- return connect handler:
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195 return function(socket)
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196 local survive = true -- set to false if process shall be terminated later
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197 repeat
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198 -- process named arguments "request_header_size_limit" and "request_body_size_limit":
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199 local remaining_header_size_limit = options.request_header_size_limit or 1024*1024
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200 local remaining_body_size_limit = options.request_body_size_limit or 64*1024*1024
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201 -- state variables for request handling:
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202 local output_state = "no_status_sent" -- one of:
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203 -- "no_status_sent" (initial state)
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204 -- "info_status_sent" (1xx status code has been sent)
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205 -- "bodyless_status_sent" (204/304 status code has been sent)
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206 -- "status_sent" (regular status code has been sent)
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207 -- "headers_sent" (headers have been terminated)
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208 -- "finished" (request has been answered completely)
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209 local content_length -- value of Content-Length header sent
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210 local bytes_sent = 0 -- number of bytes sent if Content-Length is set
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211 local chunk_parts = {} -- list of chunks to send
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212 local chunk_bytes = 0 -- sum of lengths of chunks to send
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213 local connection_close_requested = false
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214 local connection_close_responded = false
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215 local headers_value_nil = {} -- header values that are nil
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216 local request_body_content_length -- Content-Length of request body
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217 local input_state = "pending" -- one of:
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218 -- "pending" (request body has not been processed yet)
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219 -- "deferred" (request body processing is deferred)
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220 -- "inprogress" (request body is currently being read)
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221 -- "finished" (request body has been read)
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222 local streamed_post_params = {} -- mapping from POST field name to stream function
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223 local streamed_post_param_patterns = {} -- list of POST field pattern and stream function pairs
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224 -- object passed to handler (with methods, GET/POST params, etc.):
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225 local request
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226 -- reads a number of bytes from the socket,
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227 -- optionally feeding these bytes chunk-wise
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228 -- into a callback function:
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229 local function read_body_bytes(remaining, callback)
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230 while remaining > 0 do
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231 local limit
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232 if remaining > input_chunk_size then
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233 limit = input_chunk_size
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234 else
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235 limit = remaining
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236 end
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237 local chunk = socket:read(limit)
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238 if not chunk or #chunk ~= limit then
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239 assert_io(false, "Unexpected EOF or read error while reading chunk of request body")
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240 end
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241 remaining = remaining - limit
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242 if callback then
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243 callback(chunk)
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244 end
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245 end
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246 end
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jbe@0
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247 -- flushes or closes the socket (depending on
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248 -- whether "Connection: close" header was sent):
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249 local function finish_response()
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250 if connection_close_responded then
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jbe@0
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251 -- close output stream:
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252 socket.output:close()
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253 -- wait for EOF of peer to avoid immediate TCP RST condition:
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254 timeout(2, function()
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255 while socket.input:read(input_chunk_size) do end
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256 end)
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257 -- fully close socket:
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jbe@44
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258 assert_io(socket:close())
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259 else
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260 assert_io(socket:flush())
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261 request:stream_request_body()
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262 end
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263 end
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264 -- writes out buffered chunks (without flushing the socket):
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265 local function send_chunk()
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266 if chunk_bytes > 0 then
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jbe@44
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267 assert_io(socket:write(string.format("%x\r\n", chunk_bytes)))
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268 for i = 1, #chunk_parts do
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269 assert_io(socket:write(chunk_parts[i]))
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270 end
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271 chunk_parts = {}
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272 chunk_bytes = 0
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273 assert_io(socket:write("\r\n"))
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jbe@0
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274 end
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jbe@0
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275 end
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jbe@0
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276 -- terminate header section in response, optionally flushing:
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277 -- (may be called multiple times unless response is finished)
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278 local function finish_headers(flush)
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279 if output_state == "no_status_sent" then
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280 error("HTTP status has not been sent yet")
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281 elseif output_state == "finished" then
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282 error("Response has already been finished")
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283 elseif output_state == "info_status_sent" then
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jbe@44
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284 assert_io(socket:write("\r\n"))
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285 assert_io(socket:flush())
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286 output_state = "no_status_sent"
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287 elseif output_state == "bodyless_status_sent" then
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288 if connection_close_requested and not connection_close_responded then
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jbe@0
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289 request:send_header("Connection", "close")
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290 end
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jbe@44
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291 assert_io(socket:write("\r\n"))
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292 finish_response()
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293 output_state = "finished"
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294 elseif output_state == "status_sent" then
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295 if not content_length then
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jbe@44
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296 assert_io(socket:write("Transfer-Encoding: chunked\r\n"))
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297 end
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jbe@0
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298 if connection_close_requested and not connection_close_responded then
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299 request:send_header("Connection", "close")
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300 end
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jbe@44
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301 assert_io(socket:write("\r\n"))
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jbe@0
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302 if request.method == "HEAD" then
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303 finish_response()
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304 elseif flush then
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305 assert_io(socket:flush())
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306 end
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307 output_state = "headers_sent"
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308 elseif output_state ~= "headers_sent" then
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309 error("Unexpected internal status in HTTP engine")
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310 end
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311 end
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jbe@0
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312 -- create request object and set several functions and values:
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313 request = {
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|
314 -- allow raw socket access:
|
|
jbe@0
|
315 socket = socket,
|
|
jbe@0
|
316 -- parsed cookies:
|
|
jbe@0
|
317 cookies = {},
|
|
jbe@0
|
318 -- send a HTTP response status (e.g. "200 OK"):
|
|
jbe@0
|
319 send_status = function(self, value)
|
|
jbe@0
|
320 if input_state == "pending" then
|
|
jbe@0
|
321 request:process_request_body()
|
|
jbe@0
|
322 end
|
|
jbe@0
|
323 if output_state == "info_status_sent" then
|
|
jbe@44
|
324 assert_io(socket:write("\r\n"))
|
|
jbe@44
|
325 assert_io(socket:flush())
|
|
jbe@0
|
326 elseif output_state ~= "no_status_sent" then
|
|
jbe@0
|
327 error("HTTP status has already been sent")
|
|
jbe@0
|
328 end
|
|
jbe@0
|
329 local status1 = string.sub(value, 1, 1)
|
|
jbe@0
|
330 local status3 = string.sub(value, 1, 3)
|
|
jbe@44
|
331 assert_io(socket:write("HTTP/1.1 ", value, "\r\n", preamble))
|
|
jbe@0
|
332 local without_response_body = status_without_response_body[status3]
|
|
jbe@0
|
333 if without_response_body then
|
|
jbe@0
|
334 output_state = "bodyless_status_sent"
|
|
jbe@0
|
335 if without_response_body == "zero_content_length" then
|
|
jbe@0
|
336 request:send_header("Content-Length", 0)
|
|
jbe@0
|
337 end
|
|
jbe@0
|
338 elseif status1 == "1" then
|
|
jbe@0
|
339 output_state = "info_status_sent"
|
|
jbe@0
|
340 else
|
|
jbe@0
|
341 output_state = "status_sent"
|
|
jbe@0
|
342 end
|
|
jbe@0
|
343 end,
|
|
jbe@0
|
344 -- send a HTTP response header
|
|
jbe@0
|
345 -- (key and value as separate args):
|
|
jbe@0
|
346 send_header = function(self, key, value)
|
|
jbe@0
|
347 if output_state == "no_status_sent" then
|
|
jbe@0
|
348 error("HTTP status has not been sent yet")
|
|
jbe@0
|
349 elseif
|
|
jbe@0
|
350 output_state ~= "info_status_sent" and
|
|
jbe@0
|
351 output_state ~= "bodyless_status_sent" and
|
|
jbe@0
|
352 output_state ~= "status_sent"
|
|
jbe@0
|
353 then
|
|
jbe@0
|
354 error("All HTTP headers have already been sent")
|
|
jbe@0
|
355 end
|
|
jbe@0
|
356 local key_lower = string.lower(key)
|
|
jbe@0
|
357 if key_lower == "content-length" then
|
|
jbe@0
|
358 if output_state == "info_status_sent" then
|
|
jbe@0
|
359 error("Cannot set Content-Length for informational status response")
|
|
jbe@0
|
360 end
|
|
jbe@0
|
361 local new_content_length = assert(tonumber(value), "Invalid content-length")
|
|
jbe@0
|
362 if content_length == nil then
|
|
jbe@0
|
363 content_length = new_content_length
|
|
jbe@0
|
364 elseif content_length == new_content_length then
|
|
jbe@0
|
365 return
|
|
jbe@0
|
366 else
|
|
jbe@0
|
367 error("Content-Length has been set multiple times with different values")
|
|
jbe@0
|
368 end
|
|
jbe@0
|
369 elseif key_lower == "connection" then
|
|
jbe@0
|
370 for entry in string.gmatch(string.lower(value), "[^,]+") do
|
|
jbe@0
|
371 if string.match(entry, "^[ \t]*close[ \t]*$") then
|
|
jbe@0
|
372 if output_state == "info_status_sent" then
|
|
jbe@0
|
373 error("Cannot set \"Connection: close\" for informational status response")
|
|
jbe@0
|
374 end
|
|
jbe@0
|
375 if connection_close_responded then
|
|
jbe@0
|
376 return
|
|
jbe@0
|
377 else
|
|
jbe@0
|
378 connection_close_responded = true
|
|
jbe@0
|
379 break
|
|
jbe@0
|
380 end
|
|
jbe@0
|
381 end
|
|
jbe@0
|
382 end
|
|
jbe@0
|
383 end
|
|
jbe@44
|
384 assert_io(socket:write(key, ": ", value, "\r\n"))
|
|
jbe@0
|
385 end,
|
|
jbe@0
|
386 -- method to finish and flush headers:
|
|
jbe@0
|
387 finish_headers = function()
|
|
jbe@0
|
388 finish_headers(true)
|
|
jbe@0
|
389 end,
|
|
jbe@0
|
390 -- send data for response body:
|
|
jbe@0
|
391 send_data = function(self, ...)
|
|
jbe@0
|
392 if output_state == "info_status_sent" then
|
|
jbe@0
|
393 error("No (non-informational) HTTP status has been sent yet")
|
|
jbe@0
|
394 elseif output_state == "bodyless_status_sent" then
|
|
jbe@0
|
395 error("Cannot send response data for body-less status message")
|
|
jbe@0
|
396 end
|
|
jbe@0
|
397 finish_headers(false)
|
|
jbe@0
|
398 if output_state ~= "headers_sent" then
|
|
jbe@0
|
399 error("Unexpected internal status in HTTP engine")
|
|
jbe@0
|
400 end
|
|
jbe@0
|
401 if request.method == "HEAD" then
|
|
jbe@0
|
402 return
|
|
jbe@0
|
403 end
|
|
jbe@0
|
404 for i = 1, select("#", ...) do
|
|
jbe@0
|
405 local str = tostring(select(i, ...))
|
|
jbe@0
|
406 if #str > 0 then
|
|
jbe@0
|
407 if content_length then
|
|
jbe@0
|
408 local bytes_to_send = #str
|
|
jbe@0
|
409 if bytes_sent + bytes_to_send > content_length then
|
|
jbe@44
|
410 assert_io(socket:write(string.sub(str, 1, content_length - bytes_sent)))
|
|
jbe@0
|
411 bytes_sent = content_length
|
|
jbe@0
|
412 error("Content length exceeded")
|
|
jbe@0
|
413 else
|
|
jbe@44
|
414 assert_io(socket:write(str))
|
|
jbe@0
|
415 bytes_sent = bytes_sent + bytes_to_send
|
|
jbe@0
|
416 end
|
|
jbe@0
|
417 else
|
|
jbe@0
|
418 chunk_bytes = chunk_bytes + #str
|
|
jbe@0
|
419 chunk_parts[#chunk_parts+1] = str
|
|
jbe@0
|
420 end
|
|
jbe@0
|
421 end
|
|
jbe@0
|
422 end
|
|
jbe@0
|
423 if chunk_bytes >= output_chunk_size then
|
|
jbe@0
|
424 send_chunk()
|
|
jbe@0
|
425 end
|
|
jbe@0
|
426 end,
|
|
jbe@0
|
427 -- flush output buffer:
|
|
jbe@0
|
428 flush = function(self)
|
|
jbe@0
|
429 send_chunk()
|
|
jbe@44
|
430 assert_io(socket:flush())
|
|
jbe@0
|
431 end,
|
|
jbe@0
|
432 -- finish response:
|
|
jbe@0
|
433 finish = function(self)
|
|
jbe@0
|
434 if output_state == "finished" then
|
|
jbe@0
|
435 return
|
|
jbe@0
|
436 elseif output_state == "info_status_sent" then
|
|
jbe@0
|
437 error("Informational HTTP response can be finished with :finish_headers() method")
|
|
jbe@0
|
438 end
|
|
jbe@0
|
439 finish_headers(false)
|
|
jbe@0
|
440 if output_state == "headers_sent" then
|
|
jbe@0
|
441 if request.method ~= "HEAD" then
|
|
jbe@0
|
442 if content_length then
|
|
jbe@0
|
443 if bytes_sent ~= content_length then
|
|
jbe@0
|
444 error("Content length not used")
|
|
jbe@0
|
445 end
|
|
jbe@0
|
446 else
|
|
jbe@0
|
447 send_chunk()
|
|
jbe@44
|
448 assert_io(socket:write("0\r\n\r\n"))
|
|
jbe@0
|
449 end
|
|
jbe@0
|
450 finish_response()
|
|
jbe@0
|
451 end
|
|
jbe@0
|
452 output_state = "finished"
|
|
jbe@28
|
453 elseif output_state ~= "finished" then
|
|
jbe@0
|
454 error("Unexpected internal status in HTTP engine")
|
|
jbe@0
|
455 end
|
|
jbe@0
|
456 end,
|
|
jbe@0
|
457 -- table mapping header field names to value-lists
|
|
jbe@0
|
458 -- (raw access):
|
|
jbe@0
|
459 headers = setmetatable({}, {
|
|
jbe@0
|
460 __index = function(self, key)
|
|
jbe@0
|
461 local lowerkey = string.lower(key)
|
|
jbe@0
|
462 if lowerkey == key then
|
|
jbe@0
|
463 return
|
|
jbe@0
|
464 end
|
|
jbe@0
|
465 local result = rawget(self, lowerkey)
|
|
jbe@0
|
466 if result == nil then
|
|
jbe@0
|
467 result = {}
|
|
jbe@0
|
468 end
|
|
jbe@0
|
469 self[lowerkey] = result
|
|
jbe@0
|
470 self[key] = result
|
|
jbe@0
|
471 return result
|
|
jbe@0
|
472 end
|
|
jbe@0
|
473 }),
|
|
jbe@0
|
474 -- table mapping header field names to value-lists
|
|
jbe@0
|
475 -- (for headers with comma separated values):
|
|
jbe@0
|
476 headers_csv_table = setmetatable({}, {
|
|
jbe@0
|
477 __index = function(self, key)
|
|
jbe@0
|
478 local result = {}
|
|
jbe@0
|
479 for i, line in ipairs(request.headers[key]) do
|
|
jbe@0
|
480 for entry in string.gmatch(line, "[^,]+") do
|
|
jbe@0
|
481 local value = string.match(entry, "^[ \t]*(..-)[ \t]*$")
|
|
jbe@0
|
482 if value then
|
|
jbe@0
|
483 result[#result+1] = value
|
|
jbe@0
|
484 end
|
|
jbe@0
|
485 end
|
|
jbe@0
|
486 end
|
|
jbe@0
|
487 self[key] = result
|
|
jbe@0
|
488 return result
|
|
jbe@0
|
489 end
|
|
jbe@0
|
490 }),
|
|
jbe@0
|
491 -- table mapping header field names to a comma separated string
|
|
jbe@0
|
492 -- (for headers with comma separated values):
|
|
jbe@0
|
493 headers_csv_string = setmetatable({}, {
|
|
jbe@0
|
494 __index = function(self, key)
|
|
jbe@0
|
495 local result = {}
|
|
jbe@0
|
496 for i, line in ipairs(request.headers[key]) do
|
|
jbe@0
|
497 result[#result+1] = line
|
|
jbe@0
|
498 end
|
|
jbe@0
|
499 result = string.concat(result, ", ")
|
|
jbe@0
|
500 self[key] = result
|
|
jbe@0
|
501 return result
|
|
jbe@0
|
502 end
|
|
jbe@0
|
503 }),
|
|
jbe@0
|
504 -- table mapping header field names to a single string value
|
|
jbe@0
|
505 -- (or false if header has been sent multiple times):
|
|
jbe@0
|
506 headers_value = setmetatable({}, {
|
|
jbe@0
|
507 __index = function(self, key)
|
|
jbe@0
|
508 if headers_value_nil[key] then
|
|
jbe@0
|
509 return nil
|
|
jbe@0
|
510 end
|
|
jbe@0
|
511 local result = nil
|
|
jbe@0
|
512 local values = request.headers_csv_table[key]
|
|
jbe@0
|
513 if #values == 0 then
|
|
jbe@0
|
514 headers_value_nil[key] = true
|
|
jbe@0
|
515 elseif #values == 1 then
|
|
jbe@0
|
516 result = values[1]
|
|
jbe@0
|
517 else
|
|
jbe@0
|
518 result = false
|
|
jbe@0
|
519 end
|
|
jbe@0
|
520 self[key] = result
|
|
jbe@0
|
521 return result
|
|
jbe@0
|
522 end
|
|
jbe@0
|
523 }),
|
|
jbe@0
|
524 -- table mapping header field names to a flag table,
|
|
jbe@0
|
525 -- indicating if the comma separated value contains certain entries:
|
|
jbe@0
|
526 headers_flags = setmetatable({}, {
|
|
jbe@0
|
527 __index = function(self, key)
|
|
jbe@0
|
528 local result = setmetatable({}, {
|
|
jbe@0
|
529 __index = function(self, key)
|
|
jbe@0
|
530 local lowerkey = string.lower(key)
|
|
jbe@0
|
531 local result = rawget(self, lowerkey) or false
|
|
jbe@0
|
532 self[lowerkey] = result
|
|
jbe@0
|
533 self[key] = result
|
|
jbe@0
|
534 return result
|
|
jbe@0
|
535 end
|
|
jbe@0
|
536 })
|
|
jbe@0
|
537 for i, value in ipairs(request.headers_csv_table[key]) do
|
|
jbe@0
|
538 result[string.lower(value)] = true
|
|
jbe@0
|
539 end
|
|
jbe@0
|
540 self[key] = result
|
|
jbe@0
|
541 return result
|
|
jbe@0
|
542 end
|
|
jbe@0
|
543 }),
|
|
jbe@0
|
544 -- register POST param stream handler for a single field name:
|
|
jbe@0
|
545 stream_post_param = function(self, field_name, callback)
|
|
jbe@0
|
546 if input_state == "inprogress" or input_state == "finished" then
|
|
jbe@0
|
547 error("Cannot register POST param streaming function if request body is already processed")
|
|
jbe@0
|
548 end
|
|
jbe@0
|
549 streamed_post_params[field_name] = callback
|
|
jbe@0
|
550 end,
|
|
jbe@0
|
551 -- register POST param stream handler for a field name pattern:
|
|
jbe@0
|
552 stream_post_params = function(self, pattern, callback)
|
|
jbe@0
|
553 if input_state == "inprogress" or input_state == "finished" then
|
|
jbe@0
|
554 error("Cannot register POST param streaming function if request body is already processed")
|
|
jbe@0
|
555 end
|
|
jbe@0
|
556 streamed_post_param_patterns[#streamed_post_param_patterns+1] = {pattern, callback}
|
|
jbe@0
|
557 end,
|
|
jbe@0
|
558 -- disables automatic request body processing on write
|
|
jbe@0
|
559 -- (use with caution):
|
|
jbe@0
|
560 defer_reading = function(self)
|
|
jbe@0
|
561 if input_state == "pending" then
|
|
jbe@0
|
562 input_state = "deferred"
|
|
jbe@0
|
563 end
|
|
jbe@0
|
564 end,
|
|
jbe@0
|
565 -- processes the request body and sets the request.post_params,
|
|
jbe@0
|
566 -- request.post_params_list, request.meta_post_params, and
|
|
jbe@0
|
567 -- request.meta_post_params_list values (can be called manually or
|
|
jbe@0
|
568 -- automatically if post_params are accessed or data is written out)
|
|
jbe@0
|
569 process_request_body = function(self)
|
|
jbe@0
|
570 if input_state == "finished" then
|
|
jbe@0
|
571 return
|
|
jbe@0
|
572 end
|
|
jbe@0
|
573 local post_params_list, post_params = new_params_list()
|
|
jbe@0
|
574 local content_type = request.headers_value["Content-Type"]
|
|
jbe@0
|
575 if content_type then
|
|
jbe@0
|
576 if
|
|
jbe@0
|
577 content_type == "application/x-www-form-urlencoded" or
|
|
jbe@0
|
578 string.match(content_type, "^application/x%-www%-form%-urlencoded *;")
|
|
jbe@0
|
579 then
|
|
jbe@0
|
580 read_urlencoded_form(post_params_list, request.body)
|
|
jbe@0
|
581 else
|
|
jbe@0
|
582 local boundary = string.match(
|
|
jbe@0
|
583 content_type,
|
|
jbe@0
|
584 '^multipart/form%-data[ \t]*[;,][ \t]*boundary="([^"]+)"$'
|
|
jbe@0
|
585 ) or string.match(
|
|
jbe@0
|
586 content_type,
|
|
jbe@0
|
587 '^multipart/form%-data[ \t]*[;,][ \t]*boundary=([^"; \t]+)$'
|
|
jbe@0
|
588 )
|
|
jbe@0
|
589 if boundary then
|
|
jbe@0
|
590 local post_metadata_list, post_metadata = new_params_list()
|
|
jbe@0
|
591 boundary = "--" .. boundary
|
|
jbe@0
|
592 local headerdata = ""
|
|
jbe@0
|
593 local streamer
|
|
jbe@0
|
594 local field_name
|
|
jbe@0
|
595 local metadata = {}
|
|
jbe@0
|
596 local value_parts
|
|
jbe@0
|
597 local function default_streamer(chunk)
|
|
jbe@0
|
598 value_parts[#value_parts+1] = chunk
|
|
jbe@0
|
599 end
|
|
jbe@0
|
600 local function stream_part_finish()
|
|
jbe@0
|
601 if streamer == default_streamer then
|
|
jbe@0
|
602 local value = table.concat(value_parts)
|
|
jbe@0
|
603 value_parts = nil
|
|
jbe@0
|
604 if field_name then
|
|
jbe@0
|
605 local values = post_params_list[field_name]
|
|
jbe@0
|
606 values[#values+1] = value
|
|
jbe@0
|
607 local metadata_entries = post_metadata_list[field_name]
|
|
jbe@0
|
608 metadata_entries[#metadata_entries+1] = metadata
|
|
jbe@0
|
609 end
|
|
jbe@0
|
610 else
|
|
jbe@0
|
611 streamer()
|
|
jbe@0
|
612 end
|
|
jbe@0
|
613 headerdata = ""
|
|
jbe@0
|
614 streamer = nil
|
|
jbe@0
|
615 field_name = nil
|
|
jbe@0
|
616 metadata = {}
|
|
jbe@0
|
617 end
|
|
jbe@0
|
618 local function stream_part_chunk(chunk)
|
|
jbe@0
|
619 if streamer then
|
|
jbe@0
|
620 streamer(chunk)
|
|
jbe@0
|
621 else
|
|
jbe@0
|
622 headerdata = headerdata .. chunk
|
|
jbe@0
|
623 while true do
|
|
jbe@0
|
624 local line, remaining = string.match(headerdata, "^(.-)\r?\n(.*)$")
|
|
jbe@0
|
625 if not line then
|
|
jbe@0
|
626 break
|
|
jbe@0
|
627 end
|
|
jbe@0
|
628 if line == "" then
|
|
jbe@0
|
629 streamer = streamed_post_params[field_name]
|
|
jbe@0
|
630 if not streamer then
|
|
jbe@0
|
631 for i, rule in ipairs(streamed_post_param_patterns) do
|
|
jbe@0
|
632 if string.match(field_name, rule[1]) then
|
|
jbe@0
|
633 streamer = rule[2]
|
|
jbe@0
|
634 break
|
|
jbe@0
|
635 end
|
|
jbe@0
|
636 end
|
|
jbe@0
|
637 end
|
|
jbe@0
|
638 if not streamer then
|
|
jbe@0
|
639 value_parts = {}
|
|
jbe@0
|
640 streamer = default_streamer
|
|
jbe@0
|
641 end
|
|
jbe@0
|
642 streamer(remaining, field_name, metadata)
|
|
jbe@0
|
643 return
|
|
jbe@0
|
644 end
|
|
jbe@0
|
645 headerdata = remaining
|
|
jbe@0
|
646 local header_key, header_value = string.match(line, "^([^:]*):[ \t]*(.-)[ \t]*$")
|
|
jbe@0
|
647 if not header_key then
|
|
jbe@0
|
648 error("Invalid header in multipart/form-data part")
|
|
jbe@0
|
649 end
|
|
jbe@0
|
650 header_key = string.lower(header_key)
|
|
jbe@0
|
651 if header_key == "content-disposition" then
|
|
jbe@0
|
652 local escaped_header_value = string.gsub(header_value, '"[^"]*"', function(str)
|
|
jbe@0
|
653 return string.gsub(str, "=", "==")
|
|
jbe@0
|
654 end)
|
|
jbe@0
|
655 field_name = string.match(escaped_header_value, ';[ \t]*name="([^"]*)"')
|
|
jbe@0
|
656 if field_name then
|
|
jbe@0
|
657 field_name = string.gsub(field_name, "==", "=")
|
|
jbe@0
|
658 else
|
|
jbe@0
|
659 field_name = string.match(header_value, ';[ \t]*name=([^"; \t]+)')
|
|
jbe@0
|
660 end
|
|
jbe@0
|
661 metadata.file_name = string.match(escaped_header_value, ';[ \t]*filename="([^"]*)"')
|
|
jbe@0
|
662 if metadata.file_name then
|
|
jbe@0
|
663 metadata.file_name = string.gsub(metadata.file_name, "==", "=")
|
|
jbe@0
|
664 else
|
|
jbe@0
|
665 string.match(header_value, ';[ \t]*filename=([^"; \t]+)')
|
|
jbe@0
|
666 end
|
|
jbe@0
|
667 elseif header_key == "content-type" then
|
|
jbe@0
|
668 metadata.content_type = header_value
|
|
jbe@0
|
669 elseif header_key == "content-transfer-encoding" then
|
|
jbe@0
|
670 error("Content-transfer-encoding not supported by multipart/form-data parser")
|
|
jbe@0
|
671 end
|
|
jbe@0
|
672 end
|
|
jbe@0
|
673 end
|
|
jbe@0
|
674 end
|
|
jbe@0
|
675 local skippart = true -- ignore data until first boundary
|
|
jbe@0
|
676 local afterbound = false -- interpret 2 bytes after boundary ("\r\n" or "--")
|
|
jbe@0
|
677 local terminated = false -- final boundary read
|
|
jbe@0
|
678 local bigchunk = ""
|
|
jbe@0
|
679 request:stream_request_body(function(chunk)
|
|
jbe@0
|
680 if terminated then
|
|
jbe@0
|
681 return
|
|
jbe@0
|
682 end
|
|
jbe@0
|
683 bigchunk = bigchunk .. chunk
|
|
jbe@0
|
684 while true do
|
|
jbe@0
|
685 if afterbound then
|
|
jbe@0
|
686 if #bigchunk <= 2 then
|
|
jbe@0
|
687 return
|
|
jbe@0
|
688 end
|
|
jbe@0
|
689 local terminator = string.sub(bigchunk, 1, 2)
|
|
jbe@0
|
690 if terminator == "\r\n" then
|
|
jbe@0
|
691 afterbound = false
|
|
jbe@0
|
692 bigchunk = string.sub(bigchunk, 3)
|
|
jbe@0
|
693 elseif terminator == "--" then
|
|
jbe@0
|
694 terminated = true
|
|
jbe@0
|
695 bigchunk = nil
|
|
jbe@0
|
696 return
|
|
jbe@0
|
697 else
|
|
jbe@0
|
698 error("Error while parsing multipart body (expected CRLF or double minus)")
|
|
jbe@0
|
699 end
|
|
jbe@0
|
700 end
|
|
jbe@0
|
701 local pos1, pos2 = string.find(bigchunk, boundary, 1, true)
|
|
jbe@0
|
702 if not pos1 then
|
|
jbe@0
|
703 if not skippart then
|
|
jbe@0
|
704 local safe = #bigchunk-#boundary
|
|
jbe@0
|
705 if safe > 0 then
|
|
jbe@0
|
706 stream_part_chunk(string.sub(bigchunk, 1, safe))
|
|
jbe@0
|
707 bigchunk = string.sub(bigchunk, safe+1)
|
|
jbe@0
|
708 end
|
|
jbe@0
|
709 end
|
|
jbe@0
|
710 return
|
|
jbe@0
|
711 end
|
|
jbe@0
|
712 if not skippart then
|
|
jbe@0
|
713 stream_part_chunk(string.sub(bigchunk, 1, pos1 - 1))
|
|
jbe@0
|
714 stream_part_finish()
|
|
jbe@0
|
715 else
|
|
jbe@0
|
716 boundary = "\r\n" .. boundary
|
|
jbe@0
|
717 skippart = false
|
|
jbe@0
|
718 end
|
|
jbe@0
|
719 bigchunk = string.sub(bigchunk, pos2 + 1)
|
|
jbe@0
|
720 afterbound = true
|
|
jbe@0
|
721 end
|
|
jbe@0
|
722 end)
|
|
jbe@0
|
723 if not terminated then
|
|
jbe@0
|
724 error("Premature end of multipart/form-data request body")
|
|
jbe@0
|
725 end
|
|
jbe@0
|
726 request.post_metadata_list, request.post_metadata = post_metadata_list, post_metadata
|
|
jbe@0
|
727 else
|
|
jbe@0
|
728 error("Unknown Content-Type of request body")
|
|
jbe@0
|
729 end
|
|
jbe@0
|
730 end
|
|
jbe@0
|
731 end
|
|
jbe@0
|
732 request.post_params_list, request.post_params = post_params_list, post_params
|
|
jbe@0
|
733 end,
|
|
jbe@0
|
734 -- stream request body to an (optional) callback function
|
|
jbe@0
|
735 -- without processing it otherwise:
|
|
jbe@0
|
736 stream_request_body = function(self, callback)
|
|
jbe@0
|
737 if input_state ~= "pending" and input_state ~= "deferred" then
|
|
jbe@0
|
738 if callback then
|
|
jbe@0
|
739 if input_state == "inprogress" then
|
|
jbe@0
|
740 error("Request body is already being processed")
|
|
jbe@0
|
741 else
|
|
jbe@0
|
742 error("Request body has already been processed")
|
|
jbe@0
|
743 end
|
|
jbe@0
|
744 end
|
|
jbe@0
|
745 return
|
|
jbe@0
|
746 end
|
|
jbe@0
|
747 input_state = "inprogress"
|
|
jbe@0
|
748 if request.headers_flags["Expect"]["100-continue"] then
|
|
jbe@0
|
749 request:send_status("100 Continue")
|
|
jbe@0
|
750 request:finish_headers()
|
|
jbe@0
|
751 end
|
|
jbe@0
|
752 if request.headers_flags["Transfer-Encoding"]["chunked"] then
|
|
jbe@0
|
753 while true do
|
|
jbe@0
|
754 local line = socket:readuntil("\n", 32 + remaining_body_size_limit)
|
|
jbe@44
|
755 if not (
|
|
jbe@44
|
756 line and (
|
|
jbe@44
|
757 string.match(line, "^[0-9A-Fa-f]+\r?$") or
|
|
jbe@44
|
758 string.match(line, "^[0-9A-Fa-f]+[ \t;]")
|
|
jbe@44
|
759 )
|
|
jbe@44
|
760 ) then
|
|
jbe@44
|
761 assert_io(false, "Unexpected EOF or read error while reading next chunk of request body")
|
|
jbe@0
|
762 end
|
|
jbe@0
|
763 local zeros, lenstr = string.match(line, "^(0*)([1-9A-Fa-f]+[0-9A-Fa-f]*)\r?\n$")
|
|
jbe@0
|
764 local chunkext
|
|
jbe@0
|
765 if lenstr then
|
|
jbe@0
|
766 chunkext = ""
|
|
jbe@0
|
767 else
|
|
jbe@0
|
768 zeros, lenstr, chunkext = string.match(line, "^(0*)([1-9A-Fa-f]+[0-9A-Fa-f]*)([ \t;].-)\r?\n$")
|
|
jbe@0
|
769 end
|
|
jbe@0
|
770 if not lenstr or #lenstr > 13 then
|
|
jbe@44
|
771 error("Encoding error while reading chunk of request body")
|
|
jbe@0
|
772 end
|
|
jbe@0
|
773 local len = tonumber("0x" .. lenstr)
|
|
jbe@0
|
774 remaining_body_size_limit = remaining_body_size_limit - (#zeros + #chunkext + len)
|
|
jbe@0
|
775 if remaining_body_size_limit < 0 then
|
|
jbe@0
|
776 error("Request body size limit exceeded")
|
|
jbe@0
|
777 end
|
|
jbe@0
|
778 if len == 0 then break end
|
|
jbe@0
|
779 read_body_bytes(len, callback)
|
|
jbe@0
|
780 local term = socket:readuntil("\n", 2)
|
|
jbe@0
|
781 if term ~= "\r\n" and term ~= "\n" then
|
|
jbe@0
|
782 error("Encoding error while reading chunk of request body")
|
|
jbe@0
|
783 end
|
|
jbe@0
|
784 end
|
|
jbe@0
|
785 while true do
|
|
jbe@0
|
786 local line = socket:readuntil("\n", 2 + remaining_body_size_limit)
|
|
jbe@0
|
787 if line == "\r\n" or line == "\n" then break end
|
|
jbe@0
|
788 remaining_body_size_limit = remaining_body_size_limit - #line
|
|
jbe@0
|
789 if remaining_body_size_limit < 0 then
|
|
jbe@0
|
790 error("Request body size limit exceeded while reading trailer section of chunked request body")
|
|
jbe@0
|
791 end
|
|
jbe@0
|
792 end
|
|
jbe@0
|
793 elseif request_body_content_length then
|
|
jbe@0
|
794 read_body_bytes(request_body_content_length, callback)
|
|
jbe@0
|
795 end
|
|
jbe@0
|
796 input_state = "finished"
|
|
jbe@0
|
797 end
|
|
jbe@0
|
798 }
|
|
jbe@0
|
799 -- initialize tables for GET params in request object:
|
|
jbe@0
|
800 request.get_params_list, request.get_params = new_params_list()
|
|
jbe@0
|
801 -- add meta table to request object to allow access to "body" and POST params:
|
|
jbe@0
|
802 setmetatable(request, {
|
|
jbe@0
|
803 __index = function(self, key)
|
|
jbe@0
|
804 if key == "body" then
|
|
jbe@0
|
805 local chunks = {}
|
|
jbe@0
|
806 request:stream_request_body(function(chunk)
|
|
jbe@0
|
807 chunks[#chunks+1] = chunk
|
|
jbe@0
|
808 end)
|
|
jbe@0
|
809 self.body = table.concat(chunks)
|
|
jbe@0
|
810 return self.body
|
|
jbe@0
|
811 elseif
|
|
jbe@0
|
812 key == "post_params_list" or key == "post_params" or
|
|
jbe@0
|
813 key == "post_metadata_list" or key == "post_metadata"
|
|
jbe@0
|
814 then
|
|
jbe@0
|
815 request:process_request_body()
|
|
jbe@0
|
816 return request[key]
|
|
jbe@0
|
817 end
|
|
jbe@0
|
818 end
|
|
jbe@0
|
819 })
|
|
jbe@33
|
820 -- sends a minimalistic error response and enforces closing of the
|
|
jbe@33
|
821 -- connection and returns the boolean value "survive"
|
|
jbe@7
|
822 local function error_response(...)
|
|
jbe@32
|
823 request:send_status(status)
|
|
jbe@32
|
824 request:send_header("Content-Type", "text/plain")
|
|
jbe@32
|
825 request:send_header("Connection", "close")
|
|
jbe@32
|
826 request:send_data(status, "\n")
|
|
jbe@32
|
827 if text then
|
|
jbe@32
|
828 request:send_data("\n", text, "\n")
|
|
jbe@32
|
829 end
|
|
jbe@32
|
830 request:finish()
|
|
jbe@0
|
831 return survive
|
|
jbe@0
|
832 end
|
|
jbe@0
|
833 -- read and parse request line:
|
|
jbe@0
|
834 local line = socket:readuntil("\n", remaining_header_size_limit)
|
|
jbe@0
|
835 if not line then return survive end
|
|
jbe@0
|
836 remaining_header_size_limit = remaining_header_size_limit - #line
|
|
jbe@0
|
837 if remaining_header_size_limit == 0 then
|
|
jbe@0
|
838 return error_response("413 Request Entity Too Large", "Request line too long")
|
|
jbe@0
|
839 end
|
|
jbe@10
|
840 local target, proto
|
|
jbe@10
|
841 request.method, target, proto =
|
|
jbe@0
|
842 line:match("^([^ \t\r]+)[ \t]+([^ \t\r]+)[ \t]*([^ \t\r]*)[ \t]*\r?\n$")
|
|
jbe@0
|
843 if not request.method then
|
|
jbe@0
|
844 return error_response("400 Bad Request")
|
|
jbe@0
|
845 elseif proto ~= "HTTP/1.1" then
|
|
jbe@0
|
846 return error_response("505 HTTP Version Not Supported")
|
|
jbe@38
|
847 end
|
|
jbe@38
|
848 -- read and parse headers:
|
|
jbe@38
|
849 while true do
|
|
jbe@38
|
850 local line = socket:readuntil("\n", remaining_header_size_limit);
|
|
jbe@38
|
851 remaining_header_size_limit = remaining_header_size_limit - #line
|
|
jbe@38
|
852 if not line then
|
|
jbe@38
|
853 return error_response("400 Bad Request")
|
|
jbe@38
|
854 end
|
|
jbe@38
|
855 if line == "\r\n" or line == "\n" then
|
|
jbe@38
|
856 break
|
|
jbe@38
|
857 end
|
|
jbe@38
|
858 if remaining_header_size_limit == 0 then
|
|
jbe@38
|
859 return error_response("413 Request Entity Too Large", "Headers too long")
|
|
jbe@38
|
860 end
|
|
jbe@38
|
861 local key, value = string.match(line, "^([^ \t\r]+):[ \t]*(.-)[ \t]*\r?\n$")
|
|
jbe@38
|
862 if not key then
|
|
jbe@38
|
863 return error_response("400 Bad Request")
|
|
jbe@38
|
864 end
|
|
jbe@38
|
865 local values = request.headers[key]
|
|
jbe@38
|
866 values[#values+1] = value
|
|
jbe@38
|
867 end
|
|
jbe@38
|
868 -- process "Connection: close" header if existent:
|
|
jbe@38
|
869 connection_close_requested = request.headers_flags["Connection"]["close"]
|
|
jbe@38
|
870 -- process "Content-Length" header if existent:
|
|
jbe@38
|
871 do
|
|
jbe@38
|
872 local values = request.headers_csv_table["Content-Length"]
|
|
jbe@38
|
873 if #values > 0 then
|
|
jbe@38
|
874 request_body_content_length = tonumber(values[1])
|
|
jbe@38
|
875 local proper_value = tostring(request_body_content_length)
|
|
jbe@38
|
876 for i, value in ipairs(values) do
|
|
jbe@38
|
877 value = string.match(value, "^0*(.*)")
|
|
jbe@38
|
878 if value ~= proper_value then
|
|
jbe@38
|
879 return error_response("400 Bad Request", "Content-Length header(s) invalid")
|
|
jbe@38
|
880 end
|
|
jbe@0
|
881 end
|
|
jbe@38
|
882 if request_body_content_length > remaining_body_size_limit then
|
|
jbe@38
|
883 return error_response("413 Request Entity Too Large", "Request body too big")
|
|
jbe@0
|
884 end
|
|
jbe@0
|
885 end
|
|
jbe@38
|
886 end
|
|
jbe@38
|
887 -- process "Transfer-Encoding" header if existent:
|
|
jbe@38
|
888 do
|
|
jbe@38
|
889 local flag = request.headers_flags["Transfer-Encoding"]["chunked"]
|
|
jbe@38
|
890 local list = request.headers_csv_table["Transfer-Encoding"]
|
|
jbe@38
|
891 if (flag and #list ~= 1) or (not flag and #list ~= 0) then
|
|
jbe@38
|
892 return error_response("400 Bad Request", "Unexpected Transfer-Encoding")
|
|
jbe@0
|
893 end
|
|
jbe@38
|
894 end
|
|
jbe@38
|
895 -- process "Expect" header if existent:
|
|
jbe@38
|
896 for i, value in ipairs(request.headers_csv_table["Expect"]) do
|
|
jbe@38
|
897 if string.lower(value) ~= "100-continue" then
|
|
jbe@38
|
898 return error_response("417 Expectation Failed", "Unexpected Expect header")
|
|
jbe@10
|
899 end
|
|
jbe@38
|
900 end
|
|
jbe@38
|
901 -- get mandatory Host header according to RFC 7230:
|
|
jbe@38
|
902 request.host = request.headers_value["Host"]
|
|
jbe@38
|
903 if not request.host then
|
|
jbe@38
|
904 return error_response("400 Bad Request", "No valid host header")
|
|
jbe@38
|
905 end
|
|
jbe@38
|
906 -- parse request target:
|
|
jbe@38
|
907 request.path, request.query = string.match(target, "^/([^?]*)(.*)$")
|
|
jbe@38
|
908 if not request.path then
|
|
jbe@38
|
909 local host2
|
|
jbe@38
|
910 host2, request.path, request.query = string.match(target, "^[Hh][Tt][Tt][Pp]://([^/?]+)/?([^?]*)(.*)$")
|
|
jbe@38
|
911 if host2 then
|
|
jbe@38
|
912 if request.host ~= host2 then
|
|
jbe@38
|
913 return error_response("400 Bad Request", "No valid host header")
|
|
jbe@5
|
914 end
|
|
jbe@38
|
915 elseif not (target == "*" and request.method == "OPTIONS") then
|
|
jbe@38
|
916 return error_response("400 Bad Request", "Invalid request target")
|
|
jbe@5
|
917 end
|
|
jbe@38
|
918 end
|
|
jbe@38
|
919 -- parse GET params:
|
|
jbe@38
|
920 if request.query then
|
|
jbe@38
|
921 read_urlencoded_form(request.get_params_list, request.query)
|
|
jbe@38
|
922 end
|
|
jbe@38
|
923 -- parse cookies:
|
|
jbe@38
|
924 for i, line in ipairs(request.headers["Cookie"]) do
|
|
jbe@38
|
925 for rawkey, rawvalue in
|
|
jbe@38
|
926 string.gmatch(line, "([^=; ]*)=([^=; ]*)")
|
|
jbe@38
|
927 do
|
|
jbe@38
|
928 request.cookies[decode_uri(rawkey)] = decode_uri(rawvalue)
|
|
jbe@5
|
929 end
|
|
jbe@0
|
930 end
|
|
jbe@38
|
931 -- call underlying handler and remember boolean result:
|
|
jbe@38
|
932 if handler(request) ~= true then survive = false end
|
|
jbe@38
|
933 -- finish request (unless already done by underlying handler):
|
|
jbe@38
|
934 request:finish()
|
|
jbe@31
|
935 until connection_close_responded
|
|
jbe@0
|
936 return survive
|
|
jbe@0
|
937 end
|
|
jbe@0
|
938 end
|
|
jbe@0
|
939
|
|
jbe@0
|
940 return _M
|
|
jbe@0
|
941
|