webmcp
view framework/env/request/handler.lua @ 270:aedd13009ddc
Proper handling of 404's and mime types for static file delivery
| author | jbe |
|---|---|
| date | Fri Mar 20 16:38:37 2015 +0100 (2015-03-20) |
| parents | 56d237b81c18 |
| children | ee7fcdade91d |
line source
1 --[[--
2 request.handler(
3 http_request, -- HTTP request object
4 close -- boolean indicating whether the server should announce to close the connection
5 )
7 Called by mcp.lua to process an HTTP request. Performs some initializations, calls request.router(), and handles the request.
9 --]]--
11 local function file_exists(filename)
12 local file = io.open(filename, "r")
13 if file then
14 io.close(file)
15 return true
16 else
17 return false
18 end
19 end
21 function request.handler(http_request, close)
22 _G.app = {} -- may be overwritten or modified by request initializers
23 do
24 request._in_progress = true -- NOTE: must be set to true before initializer functions are called
25 for i, func in ipairs(request._initializers) do
26 func()
27 end
28 end
30 request._http_request = http_request
31 local path = http_request.path
32 if path then
33 local relative_baseurl_elements = {}
34 for match in string.gmatch(path, "/") do
35 relative_baseurl_elements[#relative_baseurl_elements+1] = "../"
36 end
37 request._relative_baseurl = table.concat(relative_baseurl_elements)
38 else
39 request._relative_baseurl = nil
40 end
41 request._route = request.router() or {}
43 if close then
44 request.add_header("Connection", "close")
45 end
47 local success, error_info = xpcall(
48 function()
50 if request._route.static then
51 local f, errmsg = io.open(WEBMCP_BASE_PATH .. "static/" .. request._route.static, "r")
52 if not f then
53 if request.get_404_route() then
54 request.set_status("404 Not Found")
55 request.forward(request.get_404_route())
56 return
57 else
58 error('Could not open static file "' .. request._route.static .. '": ' .. errmsg)
59 end
60 end
61 local d = assert(f:read("*a"))
62 f:close()
63 slot.put_into("data", d)
64 local filename_extension = string.match(request._route.static, "%.([^.]+)$")
65 slot.set_layout(nil, request._mime_types[filename_extension] or "application/octet-stream")
66 return
67 end
69 -- restore slots if coming from http redirect
70 local tempstore_value = http_request.get_params["_tempstore"]
71 if tempstore_value then
72 trace.restore_slots{}
73 local blob = tempstore.pop(tempstore_value)
74 if blob then slot.restore_all(blob) end
75 end
77 if request.get_action() then
78 trace.request{
79 module = request.get_module(),
80 action = request.get_action()
81 }
82 if
83 request.get_404_route() and
84 not file_exists(
85 encode.action_file_path{
86 module = request.get_module(),
87 action = request.get_action()
88 }
89 )
90 then
91 request.set_status("404 Not Found")
92 request.forward(request.get_404_route())
93 else
94 if http_request.method ~= "POST" then
95 request.set_status("405 Method Not Allowed")
96 request.add_header("Allow", "POST")
97 error("Tried to invoke an action with a GET request.")
98 end
99 local action_status = execute.filtered_action{
100 module = request.get_module(),
101 action = request.get_action(),
102 }
103 if not request.is_rerouted() then
104 local routing_mode, routing_module, routing_view, routing_anchor
105 routing_mode = http_request.post_params["_webmcp_routing." .. action_status .. ".mode"]
106 routing_module = http_request.post_params["_webmcp_routing." .. action_status .. ".module"]
107 routing_view = http_request.post_params["_webmcp_routing." .. action_status .. ".view"]
108 routing_anchor = http_request.post_params["_webmcp_routing." .. action_status .. ".anchor"]
109 if not (routing_mode or routing_module or routing_view) then
110 action_status = "default"
111 routing_mode = http_request.post_params["_webmcp_routing.default.mode"]
112 routing_module = http_request.post_params["_webmcp_routing.default.module"]
113 routing_view = http_request.post_params["_webmcp_routing.default.view"]
114 routing_anchor = http_request.post_params["_webmcp_routing.default.anchor"]
115 end
116 assert(routing_module, "Routing information has no module.")
117 assert(routing_view, "Routing information has no view.")
118 if routing_mode == "redirect" then
119 local routing_params = {}
120 for key, value in pairs(request.get_param_strings{ method="POST", include_internal=true }) do
121 local status, stripped_key = string.match(
122 key, "^_webmcp_routing%.([^%.]*)%.params%.(.*)$"
123 )
124 if status == action_status then
125 routing_params[stripped_key] = value
126 end
127 end
128 request.redirect{
129 module = routing_module,
130 view = routing_view,
131 id = http_request.post_params["_webmcp_routing." .. action_status .. ".id"],
132 params = routing_params,
133 anchor = routing_anchor
134 }
135 elseif routing_mode == "forward" then
136 request.forward{ module = routing_module, view = routing_view }
137 else
138 error("Missing or unknown routing mode in request parameters.")
139 end
140 end
141 end
142 else
143 -- no action
144 trace.request{
145 module = request.get_module(),
146 view = request.get_view()
147 }
148 if
149 request.get_404_route() and
150 not file_exists(
151 encode.view_file_path{
152 module = request.get_module(),
153 view = request.get_view()
154 }
155 )
156 then
157 request.set_status("404 Not Found")
158 request.forward(request.get_404_route())
159 end
160 end
162 if not request.get_redirect_data() then
163 request.process_forward()
164 local view = request.get_view()
165 if string.find(view, "^_") then
166 error("Tried to call a private view (prefixed with underscore).")
167 end
168 execute.filtered_view{
169 module = request.get_module(),
170 view = view,
171 }
172 end
174 -- force error due to missing absolute base URL until its too late to display error message
175 --if request.get_redirect_data() then
176 -- request.get_absolute_baseurl()
177 --end
179 end,
181 function(errobj)
182 return {
183 errobj = errobj,
184 stacktrace = string.gsub(
185 debug.traceback('', 2),
186 "^\r?\n?stack traceback:\r?\n?", ""
187 )
188 }
189 end
190 )
192 if not success then trace.error{} end
194 -- TODO: extend trace system to generally monitor execution time
195 -- trace.exectime{ real = extos.monotonic_hires_time(), cpu = os.clock() }
197 slot.select('trace', trace.render) -- render trace information
199 local redirect_data = request.get_redirect_data()
201 -- log error and switch to error layout, unless success
202 if not success then
203 local errobj = error_info.errobj
204 local stacktrace = error_info.stacktrace
205 if not request._status then
206 request._status = "500 Internal Server Error"
207 end
208 slot.set_layout('system_error')
209 slot.select('system_error', function()
210 if getmetatable(errobj) == mondelefant.errorobject_metatable then
211 slot.put(
212 "<p>Database error of class <b>",
213 encode.html(errobj.code),
214 "</b> occured:<br/><b>",
215 encode.html(errobj.message),
216 "</b></p>"
217 )
218 else
219 slot.put("<p><b>", encode.html(tostring(errobj)), "</b></p>")
220 end
221 slot.put("<p>Stack trace follows:<br/>")
222 slot.put(encode.html_newlines(encode.html(stacktrace)))
223 slot.put("</p>")
224 end)
225 elseif redirect_data then
226 redirect_data = table.new(redirect_data)
227 if redirect_data.base == nil then
228 redirect_data.base = request.get_absolute_baseurl()
229 end
230 redirect_data.params = table.new(redirect_data.params)
231 local slot_dump = slot.dump_all()
232 if slot_dump ~= "" then
233 redirect_data.params.tempstore = tempstore.save(slot_dump)
234 end
235 http_request:send_status("303 See Other")
236 for i, header in ipairs(request._response_headers) do
237 http_request:send_header(header[1], header[2])
238 end
239 http_request:send_header("Location", encode.url(redirect_data))
240 http_request:finish()
241 end
243 if not success or not redirect_data then
245 http_request:send_status(request._status or "200 OK")
246 for i, header in ipairs(request._response_headers) do
247 http_request:send_header(header[1], header[2])
248 end
249 http_request:send_header("Content-Type", slot.get_content_type())
250 http_request:send_data(slot.render_layout())
251 http_request:finish()
252 end
254 end
256 --//--
258 --[[--
259 app -- table to store an application state
261 'app' is a global table for storing any application state data. It will be reset for every request.
262 --]]--
264 -- Initialized in request.handler(...).
266 --//--