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