webmcp

annotate framework/env/request/handler.lua @ 267:56d237b81c18

find changesets by author, revision, files, or words in the commit message
Support for external redirects and redirects to static files
author jbe
date Fri Mar 20 15:12:31 2015 +0100 (2015-03-20)
parents 8aa38ddcc1b2
children aedd13009ddc
rev   line source
jbe@215 1 --[[--
jbe@215 2 request.handler(
jbe@264 3 request, -- HTTP request object
jbe@264 4 close -- boolean indicating whether the server should announce to close the connection
jbe@215 5 )
jbe@215 6
jbe@255 7 Called by mcp.lua to process an HTTP request. Performs some initializations, calls request.router(), and handles the request.
jbe@215 8
jbe@215 9 --]]--
jbe@210 10
jbe@255 11 local function file_exists(filename)
jbe@255 12 local file = io.open(filename, "r")
jbe@255 13 if file then
jbe@255 14 io.close(file)
jbe@255 15 return true
jbe@255 16 else
jbe@255 17 return false
jbe@255 18 end
jbe@255 19 end
jbe@255 20
jbe@255 21 -- TODO: function incomplete yet
jbe@264 22 function request.handler(http_request, close)
jbe@258 23 _G.app = {} -- may be overwritten or modified by request initializers
jbe@255 24 do
jbe@255 25 request._in_progress = true -- NOTE: must be set to true before initializer functions are called
jbe@255 26 for i, func in ipairs(request._initializers) do
jbe@262 27 func()
jbe@255 28 end
jbe@255 29 end
jbe@255 30
jbe@212 31 request._http_request = http_request
jbe@215 32 local path = http_request.path
jbe@215 33 if path then
jbe@221 34 local relative_baseurl_elements = {}
jbe@215 35 for match in string.gmatch(path, "/") do
jbe@221 36 relative_baseurl_elements[#relative_baseurl_elements+1] = "../"
jbe@215 37 end
jbe@221 38 request._relative_baseurl = table.concat(relative_baseurl_elements)
jbe@215 39 else
jbe@215 40 request._relative_baseurl = nil
jbe@215 41 end
jbe@241 42 request._route = request.router() or {}
jbe@255 43
jbe@264 44 if close then
jbe@264 45 request.add_header("Connection", "close")
jbe@264 46 end
jbe@264 47
jbe@255 48 local success, error_info = xpcall(
jbe@255 49 function()
jbe@255 50
jbe@255 51 if request._route.static then
jbe@255 52 local f = assert(io.open(WEBMCP_BASE_PATH .. "static/" .. request._route.static, "r"))
jbe@255 53 local d = f:read("*a")
jbe@255 54 f:close()
jbe@255 55 slot.put_into("data", d)
jbe@255 56 slot.set_layout(nil, "application/octet-stream") -- TODO
jbe@255 57 return
jbe@255 58 end
jbe@255 59
jbe@255 60 -- restore slots if coming from http redirect
jbe@255 61 local tempstore_value = http_request.get_params["_tempstore"]
jbe@255 62 if tempstore_value then
jbe@255 63 trace.restore_slots{}
jbe@255 64 local blob = tempstore.pop(tempstore_value)
jbe@255 65 if blob then slot.restore_all(blob) end
jbe@255 66 end
jbe@255 67
jbe@255 68 if request.get_action() then
jbe@255 69 trace.request{
jbe@255 70 module = request.get_module(),
jbe@255 71 action = request.get_action()
jbe@255 72 }
jbe@255 73 if
jbe@255 74 request.get_404_route() and
jbe@255 75 not file_exists(
jbe@255 76 encode.action_file_path{
jbe@255 77 module = request.get_module(),
jbe@255 78 action = request.get_action()
jbe@255 79 }
jbe@255 80 )
jbe@255 81 then
jbe@255 82 request.set_status("404 Not Found")
jbe@255 83 request.forward(request.get_404_route())
jbe@255 84 else
jbe@255 85 if http_request.method ~= "POST" then
jbe@255 86 request.set_status("405 Method Not Allowed")
jbe@255 87 request.add_header("Allow", "POST")
jbe@255 88 error("Tried to invoke an action with a GET request.")
jbe@255 89 end
jbe@255 90 local action_status = execute.filtered_action{
jbe@255 91 module = request.get_module(),
jbe@255 92 action = request.get_action(),
jbe@255 93 }
jbe@255 94 if not request.is_rerouted() then
jbe@255 95 local routing_mode, routing_module, routing_view, routing_anchor
jbe@255 96 routing_mode = http_request.post_params["_webmcp_routing." .. action_status .. ".mode"]
jbe@255 97 routing_module = http_request.post_params["_webmcp_routing." .. action_status .. ".module"]
jbe@255 98 routing_view = http_request.post_params["_webmcp_routing." .. action_status .. ".view"]
jbe@255 99 routing_anchor = http_request.post_params["_webmcp_routing." .. action_status .. ".anchor"]
jbe@255 100 if not (routing_mode or routing_module or routing_view) then
jbe@255 101 action_status = "default"
jbe@255 102 routing_mode = http_request.post_params["_webmcp_routing.default.mode"]
jbe@255 103 routing_module = http_request.post_params["_webmcp_routing.default.module"]
jbe@255 104 routing_view = http_request.post_params["_webmcp_routing.default.view"]
jbe@255 105 routing_anchor = http_request.post_params["_webmcp_routing.default.anchor"]
jbe@255 106 end
jbe@255 107 assert(routing_module, "Routing information has no module.")
jbe@255 108 assert(routing_view, "Routing information has no view.")
jbe@255 109 if routing_mode == "redirect" then
jbe@255 110 local routing_params = {}
jbe@255 111 for key, value in pairs(request.get_param_strings{ method="POST", include_internal=true }) do
jbe@255 112 local status, stripped_key = string.match(
jbe@255 113 key, "^_webmcp_routing%.([^%.]*)%.params%.(.*)$"
jbe@255 114 )
jbe@255 115 if status == action_status then
jbe@255 116 routing_params[stripped_key] = value
jbe@255 117 end
jbe@255 118 end
jbe@255 119 request.redirect{
jbe@255 120 module = routing_module,
jbe@255 121 view = routing_view,
jbe@255 122 id = http_request.post_params["_webmcp_routing." .. action_status .. ".id"],
jbe@255 123 params = routing_params,
jbe@255 124 anchor = routing_anchor
jbe@255 125 }
jbe@255 126 elseif routing_mode == "forward" then
jbe@255 127 request.forward{ module = routing_module, view = routing_view }
jbe@255 128 else
jbe@255 129 error("Missing or unknown routing mode in request parameters.")
jbe@255 130 end
jbe@255 131 end
jbe@255 132 end
jbe@255 133 else
jbe@255 134 -- no action
jbe@255 135 trace.request{
jbe@255 136 module = request.get_module(),
jbe@255 137 view = request.get_view()
jbe@255 138 }
jbe@255 139 if
jbe@255 140 request.get_404_route() and
jbe@255 141 not file_exists(
jbe@255 142 encode.view_file_path{
jbe@255 143 module = request.get_module(),
jbe@255 144 view = request.get_view()
jbe@255 145 }
jbe@255 146 )
jbe@255 147 then
jbe@255 148 request.set_status("404 Not Found")
jbe@255 149 request.forward(request.get_404_route())
jbe@255 150 end
jbe@255 151 end
jbe@255 152
jbe@255 153 if not request.get_redirect_data() then
jbe@255 154 request.process_forward()
jbe@255 155 local view = request.get_view()
jbe@255 156 if string.find(view, "^_") then
jbe@255 157 error("Tried to call a private view (prefixed with underscore).")
jbe@255 158 end
jbe@255 159 execute.filtered_view{
jbe@255 160 module = request.get_module(),
jbe@255 161 view = view,
jbe@255 162 }
jbe@255 163 end
jbe@255 164
jbe@255 165 -- force error due to missing absolute base URL until its too late to display error message
jbe@255 166 --if request.get_redirect_data() then
jbe@255 167 -- request.get_absolute_baseurl()
jbe@255 168 --end
jbe@255 169
jbe@255 170 end,
jbe@255 171
jbe@255 172 function(errobj)
jbe@255 173 return {
jbe@255 174 errobj = errobj,
jbe@255 175 stacktrace = string.gsub(
jbe@255 176 debug.traceback('', 2),
jbe@255 177 "^\r?\n?stack traceback:\r?\n?", ""
jbe@255 178 )
jbe@255 179 }
jbe@255 180 end
jbe@255 181 )
jbe@255 182
jbe@255 183 if not success then trace.error{} end
jbe@255 184
jbe@255 185 -- TODO: extend trace system to generally monitor execution time
jbe@255 186 -- trace.exectime{ real = extos.monotonic_hires_time(), cpu = os.clock() }
jbe@255 187
jbe@255 188 slot.select('trace', trace.render) -- render trace information
jbe@255 189
jbe@255 190 local redirect_data = request.get_redirect_data()
jbe@255 191
jbe@255 192 -- log error and switch to error layout, unless success
jbe@255 193 if not success then
jbe@255 194 local errobj = error_info.errobj
jbe@255 195 local stacktrace = error_info.stacktrace
jbe@255 196 if not request._status then
jbe@255 197 request._status = "500 Internal Server Error"
jbe@255 198 end
jbe@255 199 slot.set_layout('system_error')
jbe@255 200 slot.select('system_error', function()
jbe@255 201 if getmetatable(errobj) == mondelefant.errorobject_metatable then
jbe@255 202 slot.put(
jbe@255 203 "<p>Database error of class <b>",
jbe@255 204 encode.html(errobj.code),
jbe@255 205 "</b> occured:<br/><b>",
jbe@255 206 encode.html(errobj.message),
jbe@255 207 "</b></p>"
jbe@255 208 )
jbe@255 209 else
jbe@255 210 slot.put("<p><b>", encode.html(tostring(errobj)), "</b></p>")
jbe@255 211 end
jbe@255 212 slot.put("<p>Stack trace follows:<br/>")
jbe@255 213 slot.put(encode.html_newlines(encode.html(stacktrace)))
jbe@255 214 slot.put("</p>")
jbe@255 215 end)
jbe@255 216 elseif redirect_data then
jbe@267 217 redirect_data = table.new(redirect_data)
jbe@267 218 if redirect_data.base == nil then
jbe@267 219 redirect_data.base = request.get_absolute_baseurl()
jbe@255 220 end
jbe@267 221 redirect_data.params = table.new(redirect_data.params)
jbe@255 222 local slot_dump = slot.dump_all()
jbe@255 223 if slot_dump ~= "" then
jbe@267 224 redirect_data.params.tempstore = tempstore.save(slot_dump)
jbe@255 225 end
jbe@255 226 http_request:send_status("303 See Other")
jbe@264 227 for i, header in ipairs(request._response_headers) do
jbe@264 228 http_request:send_header(header[1], header[2])
jbe@264 229 end
jbe@267 230 http_request:send_header("Location", encode.url(redirect_data))
jbe@255 231 http_request:finish()
jbe@255 232 end
jbe@255 233
jbe@255 234 if not success or not redirect_data then
jbe@255 235
jbe@255 236 http_request:send_status(request._status or "200 OK")
jbe@255 237 for i, header in ipairs(request._response_headers) do
jbe@255 238 http_request:send_header(header[1], header[2])
jbe@255 239 end
jbe@255 240 http_request:send_header("Content-Type", slot.get_content_type())
jbe@255 241 http_request:send_data(slot.render_layout())
jbe@255 242 http_request:finish()
jbe@255 243 end
jbe@255 244
jbe@215 245 end
jbe@258 246
jbe@258 247 --//--
jbe@258 248
jbe@258 249 --[[--
jbe@258 250 app -- table to store an application state
jbe@258 251
jbe@258 252 'app' is a global table for storing any application state data. It will be reset for every request.
jbe@258 253 --]]--
jbe@258 254
jbe@258 255 -- Initialized in request.handler(...).
jbe@258 256
jbe@258 257 --//--

Impressum / About Us