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jbe@215
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1 --[[--
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jbe@215
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2 request.handler(
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jbe@270
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3 http_request, -- HTTP request object
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4 close -- boolean indicating whether the server should announce to close the connection
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5 )
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6
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7 Called by mcp.lua to process an HTTP request. Performs some initializations, calls request.router(), and handles the request.
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8
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9 --]]--
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10
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11 local function file_exists(filename)
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12 local file = io.open(filename, "r")
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13 if file then
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14 io.close(file)
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15 return true
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16 else
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17 return false
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18 end
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19 end
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20
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21 function request.handler(http_request, close)
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22 _G.app = {} -- may be overwritten or modified by request initializers
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23 do
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24 request._in_progress = true -- NOTE: must be set to true before initializer functions are called
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25 for i, func in ipairs(request._initializers) do
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26 func()
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27 end
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28 end
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29
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30 request._http_request = http_request
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31 local path = http_request.path
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32 if path then
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33 local relative_baseurl_elements = {}
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34 for match in string.gmatch(path, "/") do
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35 relative_baseurl_elements[#relative_baseurl_elements+1] = "../"
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36 end
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jbe@280
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37 if #relative_baseurl_elements > 0 then
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38 request._relative_baseurl = table.concat(relative_baseurl_elements)
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39 else
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40 request._relative_baseurl = "./"
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41 end
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42 else
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43 request._relative_baseurl = nil
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44 end
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jbe@241
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45 request._route = request.router() or {}
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jbe@275
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46 do
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47 local post_id = http_request.post_params["_webmcp_id"]
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48 if post_id then
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49 request._route.id = post_id
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50 end
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51 end
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52
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53 if close then
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54 request.add_header("Connection", "close")
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55 end
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56
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57 local success, error_info = xpcall(
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58 function()
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59
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60 if request._route.static then
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61 local f, errmsg = io.open(WEBMCP_BASE_PATH .. "static/" .. request._route.static, "r")
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62 if not f then
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63 if request.get_404_route() then
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64 request.set_status("404 Not Found")
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65 request.forward(request.get_404_route())
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66 return
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67 else
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68 error('Could not open static file "' .. request._route.static .. '": ' .. errmsg)
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69 end
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70 end
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71 local d = assert(f:read("*a"))
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72 f:close()
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73 slot.put_into("data", d)
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74 local filename_extension = string.match(request._route.static, "%.([^.]+)$")
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75 slot.set_layout(nil, request._mime_types[filename_extension] or "application/octet-stream")
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76 return
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77 end
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78
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79 -- restore slots if coming from http redirect
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80 local tempstore_value = http_request.get_params["_tempstore"]
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81 if tempstore_value then
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82 trace.restore_slots{}
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83 local blob = tempstore.pop(tempstore_value)
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84 if blob then slot.restore_all(blob) end
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85 end
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86
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87 if request.get_action() then
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88 trace.request{
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89 module = request.get_module(),
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90 action = request.get_action()
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91 }
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92 if
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93 request.get_404_route() and
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94 not file_exists(
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95 encode.action_file_path{
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96 module = request.get_module(),
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97 action = request.get_action()
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98 }
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99 )
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100 then
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101 request.set_status("404 Not Found")
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102 request.forward(request.get_404_route())
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103 else
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104 if http_request.method ~= "POST" then
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105 request.set_status("405 Method Not Allowed")
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106 request.add_header("Allow", "POST")
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107 error("Tried to invoke an action with a GET request.")
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108 end
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109 local action_status = execute.filtered_action{
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110 module = request.get_module(),
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111 action = request.get_action(),
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112 }
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113 if not request.is_rerouted() then
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114 local routing_mode, routing_module, routing_view, routing_anchor
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115 routing_mode = http_request.post_params["_webmcp_routing." .. action_status .. ".mode"]
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116 routing_module = http_request.post_params["_webmcp_routing." .. action_status .. ".module"]
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117 routing_view = http_request.post_params["_webmcp_routing." .. action_status .. ".view"]
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118 routing_anchor = http_request.post_params["_webmcp_routing." .. action_status .. ".anchor"]
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119 if not (routing_mode or routing_module or routing_view) then
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120 action_status = "default"
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121 routing_mode = http_request.post_params["_webmcp_routing.default.mode"]
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122 routing_module = http_request.post_params["_webmcp_routing.default.module"]
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123 routing_view = http_request.post_params["_webmcp_routing.default.view"]
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124 routing_anchor = http_request.post_params["_webmcp_routing.default.anchor"]
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125 end
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126 assert(routing_module, "Routing information has no module.")
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127 assert(routing_view, "Routing information has no view.")
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128 if routing_mode == "redirect" then
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129 local routing_params = {}
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130 for key, value in pairs(request.get_param_strings{ method="POST", include_internal=true }) do
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131 local status, stripped_key = string.match(
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132 key, "^_webmcp_routing%.([^%.]*)%.params%.(.*)$"
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133 )
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134 if status == action_status then
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135 routing_params[stripped_key] = value
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136 end
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137 end
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138 request.redirect{
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139 module = routing_module,
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140 view = routing_view,
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141 id = http_request.post_params["_webmcp_routing." .. action_status .. ".id"],
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142 params = routing_params,
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143 anchor = routing_anchor
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144 }
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145 elseif routing_mode == "forward" then
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146 request.forward{ module = routing_module, view = routing_view }
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147 else
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148 error("Missing or unknown routing mode in request parameters.")
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149 end
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150 end
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151 end
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152 else
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153 -- no action
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154 trace.request{
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155 module = request.get_module(),
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156 view = request.get_view()
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157 }
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158 if
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159 request.get_404_route() and
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160 not file_exists(
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161 encode.view_file_path{
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162 module = request.get_module(),
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163 view = request.get_view()
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164 }
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165 )
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166 then
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167 request.set_status("404 Not Found")
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168 request.forward(request.get_404_route())
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169 end
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170 end
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171
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172 if not request.get_redirect_data() then
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173 request.process_forward()
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174 local view = request.get_view()
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175 if string.find(view, "^_") then
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176 error("Tried to call a private view (prefixed with underscore).")
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177 end
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178 execute.filtered_view{
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179 module = request.get_module(),
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180 view = view,
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181 }
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182 end
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183
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184 -- force error due to missing absolute base URL until its too late to display error message
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185 --if request.get_redirect_data() then
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186 -- request.get_absolute_baseurl()
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187 --end
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188
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189 end,
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190
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191 function(errobj)
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192 return {
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193 errobj = errobj,
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194 stacktrace = string.gsub(
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195 debug.traceback('', 2),
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196 "^\r?\n?stack traceback:\r?\n?", ""
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197 )
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198 }
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199 end
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200 )
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201
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202 if not success then trace.error{} end
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203
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204 -- TODO: extend trace system to generally monitor execution time
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205 -- trace.exectime{ real = extos.monotonic_hires_time(), cpu = os.clock() }
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206
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207 slot.select('trace', trace.render) -- render trace information
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208
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209 local redirect_data = request.get_redirect_data()
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210
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211 -- log error and switch to error layout, unless success
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212 if not success then
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213 local errobj = error_info.errobj
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214 local stacktrace = error_info.stacktrace
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215 if not request._status then
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216 request._status = "500 Internal Server Error"
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217 end
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jbe@255
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218 slot.set_layout('system_error')
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219 slot.select('system_error', function()
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220 if getmetatable(errobj) == mondelefant.errorobject_metatable then
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221 slot.put(
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222 "<p>Database error of class <b>",
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223 encode.html(errobj.code),
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224 "</b> occured:<br/><b>",
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225 encode.html(errobj.message),
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226 "</b></p>"
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227 )
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228 else
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229 slot.put("<p><b>", encode.html(tostring(errobj)), "</b></p>")
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230 end
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jbe@255
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231 slot.put("<p>Stack trace follows:<br/>")
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232 slot.put(encode.html_newlines(encode.html(stacktrace)))
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233 slot.put("</p>")
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jbe@255
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234 end)
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jbe@255
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235 elseif redirect_data then
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jbe@267
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236 redirect_data = table.new(redirect_data)
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jbe@267
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237 if redirect_data.base == nil then
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238 redirect_data.base = request.get_absolute_baseurl()
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239 end
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jbe@267
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240 redirect_data.params = table.new(redirect_data.params)
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jbe@255
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241 local slot_dump = slot.dump_all()
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jbe@255
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242 if slot_dump ~= "" then
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jbe@267
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243 redirect_data.params.tempstore = tempstore.save(slot_dump)
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244 end
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jbe@255
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245 http_request:send_status("303 See Other")
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246 for i, header in ipairs(request._response_headers) do
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247 http_request:send_header(header[1], header[2])
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248 end
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jbe@267
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249 http_request:send_header("Location", encode.url(redirect_data))
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250 http_request:finish()
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251 end
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jbe@255
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252
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jbe@255
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253 if not success or not redirect_data then
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254
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jbe@255
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255 http_request:send_status(request._status or "200 OK")
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256 for i, header in ipairs(request._response_headers) do
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jbe@255
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257 http_request:send_header(header[1], header[2])
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258 end
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jbe@255
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259 http_request:send_header("Content-Type", slot.get_content_type())
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jbe@255
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260 http_request:send_data(slot.render_layout())
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261 http_request:finish()
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262 end
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jbe@255
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263
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jbe@215
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264 end
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jbe@258
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265
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jbe@258
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266 --//--
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jbe@258
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267
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jbe@258
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268 --[[--
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jbe@258
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269 app -- table to store an application state
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jbe@258
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270
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271 'app' is a global table for storing any application state data. It will be reset for every request.
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jbe@258
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272 --]]--
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jbe@258
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273
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274 -- Initialized in request.handler(...).
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jbe@258
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275
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jbe@258
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276 --//--
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