webmcp
view framework/env/request/handler.lua @ 212:47ebf4213716
Storage of Moonbridge's HTTP request and request handler options in request environment
| author | jbe |
|---|---|
| date | Sat Jan 10 00:50:44 2015 +0100 (2015-01-10) |
| parents | 474cf0cfb85b |
| children | ba3dd4a17e3d |
line source
1 -- TODO: function incomplete yet
3 function request.handler(http_request)
4 request._http_request = http_request
6 local success, error_info = xpcall(
7 function()
9 -- restore slots if coming from http redirect
10 if cgi.params.tempstore then
11 trace.restore_slots{}
12 local blob = tempstore.pop(cgi.params.tempstore)
13 if blob then slot.restore_all(blob) end
14 end
16 local function file_exists(filename)
17 local file = io.open(filename, "r")
18 if file then
19 io.close(file)
20 return true
21 else
22 return false
23 end
24 end
26 if request.is_404() then
27 request.set_status("404 Not Found")
28 if request.get_404_route() then
29 request.forward(request.get_404_route())
30 else
31 error("No 404 page set.")
32 end
33 elseif request.get_action() then
34 trace.request{
35 module = request.get_module(),
36 action = request.get_action()
37 }
38 if
39 request.get_404_route() and
40 not file_exists(
41 encode.action_file_path{
42 module = request.get_module(),
43 action = request.get_action()
44 }
45 )
46 then
47 request.set_status("404 Not Found")
48 request.forward(request.get_404_route())
49 else
50 if cgi.method ~= "POST" then
51 request.set_status("405 Method Not Allowed")
52 cgi.add_header("Allow: POST")
53 error("Tried to invoke an action with a GET request.")
54 end
55 local action_status = execute.filtered_action{
56 module = request.get_module(),
57 action = request.get_action(),
58 }
59 if not request.is_rerouted() then
60 local routing_mode, routing_module, routing_view
61 routing_mode = cgi.params["_webmcp_routing." .. action_status .. ".mode"]
62 routing_module = cgi.params["_webmcp_routing." .. action_status .. ".module"]
63 routing_view = cgi.params["_webmcp_routing." .. action_status .. ".view"]
64 routing_anchor = cgi.params["_webmcp_routing." .. action_status .. ".anchor"]
65 if not (routing_mode or routing_module or routing_view) then
66 action_status = "default"
67 routing_mode = cgi.params["_webmcp_routing.default.mode"]
68 routing_module = cgi.params["_webmcp_routing.default.module"]
69 routing_view = cgi.params["_webmcp_routing.default.view"]
70 routing_anchor = cgi.params["_webmcp_routing.default.anchor"]
71 end
72 assert(routing_module, "Routing information has no module.")
73 assert(routing_view, "Routing information has no view.")
74 if routing_mode == "redirect" then
75 local routing_params = {}
76 for key, value in pairs(cgi.params) do
77 local status, stripped_key = string.match(
78 key, "^_webmcp_routing%.([^%.]*)%.params%.(.*)$"
79 )
80 if status == action_status then
81 routing_params[stripped_key] = value
82 end
83 end
84 request.redirect{
85 module = routing_module,
86 view = routing_view,
87 id = cgi.params["_webmcp_routing." .. action_status .. ".id"],
88 params = routing_params,
89 anchor = routing_anchor
90 }
91 elseif routing_mode == "forward" then
92 request.forward{ module = routing_module, view = routing_view }
93 else
94 error("Missing or unknown routing mode in request parameters.")
95 end
96 end
97 end
98 else
99 -- no action
100 trace.request{
101 module = request.get_module(),
102 view = request.get_view()
103 }
104 if
105 request.get_404_route() and
106 not file_exists(
107 encode.view_file_path{
108 module = request.get_module(),
109 view = request.get_view()
110 }
111 )
112 then
113 request.set_status("404 Not Found")
114 request.forward(request.get_404_route())
115 end
116 end
118 if not request.get_redirect_data() then
119 request.process_forward()
120 local view = request.get_view()
121 if string.find(view, "^_") then
122 error("Tried to call a private view (prefixed with underscore).")
123 end
124 execute.filtered_view{
125 module = request.get_module(),
126 view = view,
127 }
128 end
130 -- force error due to missing absolute base URL until its too late to display error message
131 --if request.get_redirect_data() then
132 -- request.get_absolute_baseurl()
133 --end
135 end,
137 function(errobj)
138 return {
139 errobj = errobj,
140 stacktrace = string.gsub(
141 debug.traceback('', 2),
142 "^\r?\n?stack traceback:\r?\n?", ""
143 )
144 }
145 end
146 )
148 if not success then trace.error{} end
150 -- laufzeitermittlung
151 trace.exectime{ real = extos.monotonic_hires_time(), cpu = os.clock() }
153 slot.select('trace', trace.render) -- render trace information
155 local redirect_data = request.get_redirect_data()
157 -- log error and switch to error layout, unless success
158 if not success then
159 local errobj = error_info.errobj
160 local stacktrace = error_info.stacktrace
161 if not request.get_status() and not request.get_json_request_slots() then
162 request.set_status("500 Internal Server Error")
163 end
164 slot.set_layout('system_error')
165 slot.select('system_error', function()
166 if getmetatable(errobj) == mondelefant.errorobject_metatable then
167 slot.put(
168 "<p>Database error of class <b>",
169 encode.html(errobj.code),
170 "</b> occured:<br/><b>",
171 encode.html(errobj.message),
172 "</b></p>"
173 )
174 else
175 slot.put("<p><b>", encode.html(tostring(errobj)), "</b></p>")
176 end
177 slot.put("<p>Stack trace follows:<br/>")
178 slot.put(encode.html_newlines(encode.html(stacktrace)))
179 slot.put("</p>")
180 end)
181 elseif redirect_data then
182 local redirect_params = {}
183 for key, value in pairs(redirect_data.params) do
184 redirect_params[key] = value
185 end
186 local slot_dump = slot.dump_all()
187 if slot_dump ~= "" then
188 redirect_params.tempstore = tempstore.save(slot_dump)
189 end
190 local json_request_slots = request.get_json_request_slots()
191 if json_request_slots then
192 redirect_params["_webmcp_json_slots[]"] = json_request_slots
193 end
194 cgi.redirect(
195 encode.url{
196 base = request.get_absolute_baseurl(),
197 module = redirect_data.module,
198 view = redirect_data.view,
199 id = redirect_data.id,
200 params = redirect_params,
201 anchor = redirect_data.anchor
202 }
203 )
204 cgi.send_data()
205 end
207 if not success or not redirect_data then
209 local http_status = request.get_status()
210 if http_status then
211 cgi.set_status(http_status)
212 end
214 local json_request_slots = request.get_json_request_slots()
215 if json_request_slots then
216 cgi.set_content_type('application/json')
217 local data = {}
218 for idx, slot_ident in ipairs(json_request_slots) do
219 data[slot_ident] = slot.get_content(slot_ident)
220 end
221 cgi.send_data(encode.json(data))
222 else
223 cgi.set_content_type(slot.get_content_type())
224 cgi.send_data(slot.render_layout())
225 end
226 end
228 end