webmcp
view framework/env/request/handler.lua @ 210:474cf0cfb85b
Moved request handling code from mcp.lua to request.handler(...)
| author | jbe |
|---|---|
| date | Sat Jan 10 00:28:03 2015 +0100 (2015-01-10) |
| parents | |
| children | 47ebf4213716 |
line source
1 -- TODO: function incomplete yet
3 function request.handler(http_request)
5 local success, error_info = xpcall(
6 function()
8 -- restore slots if coming from http redirect
9 if cgi.params.tempstore then
10 trace.restore_slots{}
11 local blob = tempstore.pop(cgi.params.tempstore)
12 if blob then slot.restore_all(blob) end
13 end
15 local function file_exists(filename)
16 local file = io.open(filename, "r")
17 if file then
18 io.close(file)
19 return true
20 else
21 return false
22 end
23 end
25 if request.is_404() then
26 request.set_status("404 Not Found")
27 if request.get_404_route() then
28 request.forward(request.get_404_route())
29 else
30 error("No 404 page set.")
31 end
32 elseif request.get_action() then
33 trace.request{
34 module = request.get_module(),
35 action = request.get_action()
36 }
37 if
38 request.get_404_route() and
39 not file_exists(
40 encode.action_file_path{
41 module = request.get_module(),
42 action = request.get_action()
43 }
44 )
45 then
46 request.set_status("404 Not Found")
47 request.forward(request.get_404_route())
48 else
49 if cgi.method ~= "POST" then
50 request.set_status("405 Method Not Allowed")
51 cgi.add_header("Allow: POST")
52 error("Tried to invoke an action with a GET request.")
53 end
54 local action_status = execute.filtered_action{
55 module = request.get_module(),
56 action = request.get_action(),
57 }
58 if not request.is_rerouted() then
59 local routing_mode, routing_module, routing_view
60 routing_mode = cgi.params["_webmcp_routing." .. action_status .. ".mode"]
61 routing_module = cgi.params["_webmcp_routing." .. action_status .. ".module"]
62 routing_view = cgi.params["_webmcp_routing." .. action_status .. ".view"]
63 routing_anchor = cgi.params["_webmcp_routing." .. action_status .. ".anchor"]
64 if not (routing_mode or routing_module or routing_view) then
65 action_status = "default"
66 routing_mode = cgi.params["_webmcp_routing.default.mode"]
67 routing_module = cgi.params["_webmcp_routing.default.module"]
68 routing_view = cgi.params["_webmcp_routing.default.view"]
69 routing_anchor = cgi.params["_webmcp_routing.default.anchor"]
70 end
71 assert(routing_module, "Routing information has no module.")
72 assert(routing_view, "Routing information has no view.")
73 if routing_mode == "redirect" then
74 local routing_params = {}
75 for key, value in pairs(cgi.params) do
76 local status, stripped_key = string.match(
77 key, "^_webmcp_routing%.([^%.]*)%.params%.(.*)$"
78 )
79 if status == action_status then
80 routing_params[stripped_key] = value
81 end
82 end
83 request.redirect{
84 module = routing_module,
85 view = routing_view,
86 id = cgi.params["_webmcp_routing." .. action_status .. ".id"],
87 params = routing_params,
88 anchor = routing_anchor
89 }
90 elseif routing_mode == "forward" then
91 request.forward{ module = routing_module, view = routing_view }
92 else
93 error("Missing or unknown routing mode in request parameters.")
94 end
95 end
96 end
97 else
98 -- no action
99 trace.request{
100 module = request.get_module(),
101 view = request.get_view()
102 }
103 if
104 request.get_404_route() and
105 not file_exists(
106 encode.view_file_path{
107 module = request.get_module(),
108 view = request.get_view()
109 }
110 )
111 then
112 request.set_status("404 Not Found")
113 request.forward(request.get_404_route())
114 end
115 end
117 if not request.get_redirect_data() then
118 request.process_forward()
119 local view = request.get_view()
120 if string.find(view, "^_") then
121 error("Tried to call a private view (prefixed with underscore).")
122 end
123 execute.filtered_view{
124 module = request.get_module(),
125 view = view,
126 }
127 end
129 -- force error due to missing absolute base URL until its too late to display error message
130 --if request.get_redirect_data() then
131 -- request.get_absolute_baseurl()
132 --end
134 end,
136 function(errobj)
137 return {
138 errobj = errobj,
139 stacktrace = string.gsub(
140 debug.traceback('', 2),
141 "^\r?\n?stack traceback:\r?\n?", ""
142 )
143 }
144 end
145 )
147 if not success then trace.error{} end
149 -- laufzeitermittlung
150 trace.exectime{ real = extos.monotonic_hires_time(), cpu = os.clock() }
152 slot.select('trace', trace.render) -- render trace information
154 local redirect_data = request.get_redirect_data()
156 -- log error and switch to error layout, unless success
157 if not success then
158 local errobj = error_info.errobj
159 local stacktrace = error_info.stacktrace
160 if not request.get_status() and not request.get_json_request_slots() then
161 request.set_status("500 Internal Server Error")
162 end
163 slot.set_layout('system_error')
164 slot.select('system_error', function()
165 if getmetatable(errobj) == mondelefant.errorobject_metatable then
166 slot.put(
167 "<p>Database error of class <b>",
168 encode.html(errobj.code),
169 "</b> occured:<br/><b>",
170 encode.html(errobj.message),
171 "</b></p>"
172 )
173 else
174 slot.put("<p><b>", encode.html(tostring(errobj)), "</b></p>")
175 end
176 slot.put("<p>Stack trace follows:<br/>")
177 slot.put(encode.html_newlines(encode.html(stacktrace)))
178 slot.put("</p>")
179 end)
180 elseif redirect_data then
181 local redirect_params = {}
182 for key, value in pairs(redirect_data.params) do
183 redirect_params[key] = value
184 end
185 local slot_dump = slot.dump_all()
186 if slot_dump ~= "" then
187 redirect_params.tempstore = tempstore.save(slot_dump)
188 end
189 local json_request_slots = request.get_json_request_slots()
190 if json_request_slots then
191 redirect_params["_webmcp_json_slots[]"] = json_request_slots
192 end
193 cgi.redirect(
194 encode.url{
195 base = request.get_absolute_baseurl(),
196 module = redirect_data.module,
197 view = redirect_data.view,
198 id = redirect_data.id,
199 params = redirect_params,
200 anchor = redirect_data.anchor
201 }
202 )
203 cgi.send_data()
204 end
206 if not success or not redirect_data then
208 local http_status = request.get_status()
209 if http_status then
210 cgi.set_status(http_status)
211 end
213 local json_request_slots = request.get_json_request_slots()
214 if json_request_slots then
215 cgi.set_content_type('application/json')
216 local data = {}
217 for idx, slot_ident in ipairs(json_request_slots) do
218 data[slot_ident] = slot.get_content(slot_ident)
219 end
220 cgi.send_data(encode.json(data))
221 else
222 cgi.set_content_type(slot.get_content_type())
223 cgi.send_data(slot.render_layout())
224 end
225 end
227 end