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