webmcp
view framework/env/request/default_router.lua @ 215:ba3dd4a17e3d
Some code cleanup/rearrangement for request handling
| author | jbe |
|---|---|
| date | Mon Jan 12 01:48:11 2015 +0100 (2015-01-12) |
| parents | framework/env/request/handler.lua@47ebf4213716 |
| children | fd0360594636 |
line source
1 -- TODO: function incomplete yet
3 local function file_exists(filename)
4 local file = io.open(filename, "r")
5 if file then
6 io.close(file)
7 return true
8 else
9 return false
10 end
11 end
13 function request.default_router(path)
14 request._http_request = http_request
15 local path = http_request.path
16 local function parse_path()
17 if not path then
18 return
19 end
20 if path == "/" then
21 return {module = "index", view = "index"}
22 end
23 module = string.match(path, "^/([^/]+)/$")
24 if module then
25 return {module = module, view = "index"}
26 end
27 module, action = string.match(path, "^/([^/]+)/([^/.]+)$")
28 if module then
29 return {module = module, action = action}
30 end
31 module, view, suffix = string.match(path, "^/([^/]+)/([^/.]+)%.([^/]+)$")
32 if module then
33 return {module = module, view = view, suffix = suffix}
34 end
35 module, view, id, suffix = string.match(path, "^/([^/]+)/([^/]+)/([^/.]+)%.([^/]+)$")
36 if module then
37 return {module = module, view = view, id = id, suffix = suffix}
38 end
39 end
40 request._data = parse_path()
41 if path then
42 local elements = {}
43 for match in string.gmatch(path, "/") do
44 elements[#elements+1] = "../"
45 end
46 elements[#elements] = nil
47 if #elements > 0 then
48 request._relative_baseurl = table.concat(elements)
49 else
50 request._relative_baseurl = "./"
51 end
52 end
53 local success, error_info = xpcall(
54 function()
56 -- restore slots if coming from http redirect
57 local tempstore_value = request.get_param{method = "GET", name = "_tempstore"}
58 if tempstore_value then
59 trace.restore_slots{}
60 local blob = tempstore.pop(tempstore_value)
61 if blob then slot.restore_all(blob) end
62 end
65 if request.is_404() then
66 request.set_status("404 Not Found")
67 if request.get_404_route() then
68 request.forward(request.get_404_route())
69 else
70 error("No 404 page set.")
71 end
72 elseif request.get_action() then
73 trace.request{
74 module = request.get_module(),
75 action = request.get_action()
76 }
77 if
78 request.get_404_route() and
79 not file_exists(
80 encode.action_file_path{
81 module = request.get_module(),
82 action = request.get_action()
83 }
84 )
85 then
86 request.set_status("404 Not Found")
87 request.forward(request.get_404_route())
88 else
89 if cgi.method ~= "POST" then
90 request.set_status("405 Method Not Allowed")
91 cgi.add_header("Allow: POST")
92 error("Tried to invoke an action with a GET request.")
93 end
94 local action_status = execute.filtered_action{
95 module = request.get_module(),
96 action = request.get_action(),
97 }
98 if not request.is_rerouted() then
99 local routing_mode, routing_module, routing_view
100 routing_mode = cgi.params["_webmcp_routing." .. action_status .. ".mode"]
101 routing_module = cgi.params["_webmcp_routing." .. action_status .. ".module"]
102 routing_view = cgi.params["_webmcp_routing." .. action_status .. ".view"]
103 routing_anchor = cgi.params["_webmcp_routing." .. action_status .. ".anchor"]
104 if not (routing_mode or routing_module or routing_view) then
105 action_status = "default"
106 routing_mode = cgi.params["_webmcp_routing.default.mode"]
107 routing_module = cgi.params["_webmcp_routing.default.module"]
108 routing_view = cgi.params["_webmcp_routing.default.view"]
109 routing_anchor = cgi.params["_webmcp_routing.default.anchor"]
110 end
111 assert(routing_module, "Routing information has no module.")
112 assert(routing_view, "Routing information has no view.")
113 if routing_mode == "redirect" then
114 local routing_params = {}
115 for key, value in pairs(cgi.params) do
116 local status, stripped_key = string.match(
117 key, "^_webmcp_routing%.([^%.]*)%.params%.(.*)$"
118 )
119 if status == action_status then
120 routing_params[stripped_key] = value
121 end
122 end
123 request.redirect{
124 module = routing_module,
125 view = routing_view,
126 id = cgi.params["_webmcp_routing." .. action_status .. ".id"],
127 params = routing_params,
128 anchor = routing_anchor
129 }
130 elseif routing_mode == "forward" then
131 request.forward{ module = routing_module, view = routing_view }
132 else
133 error("Missing or unknown routing mode in request parameters.")
134 end
135 end
136 end
137 else
138 -- no action
139 trace.request{
140 module = request.get_module(),
141 view = request.get_view()
142 }
143 if
144 request.get_404_route() and
145 not file_exists(
146 encode.view_file_path{
147 module = request.get_module(),
148 view = request.get_view()
149 }
150 )
151 then
152 request.set_status("404 Not Found")
153 request.forward(request.get_404_route())
154 end
155 end
157 if not request.get_redirect_data() then
158 request.process_forward()
159 local view = request.get_view()
160 if string.find(view, "^_") then
161 error("Tried to call a private view (prefixed with underscore).")
162 end
163 execute.filtered_view{
164 module = request.get_module(),
165 view = view,
166 }
167 end
169 -- force error due to missing absolute base URL until its too late to display error message
170 --if request.get_redirect_data() then
171 -- request.get_absolute_baseurl()
172 --end
174 end,
176 function(errobj)
177 return {
178 errobj = errobj,
179 stacktrace = string.gsub(
180 debug.traceback('', 2),
181 "^\r?\n?stack traceback:\r?\n?", ""
182 )
183 }
184 end
185 )
187 if not success then trace.error{} end
189 -- laufzeitermittlung
190 trace.exectime{ real = extos.monotonic_hires_time(), cpu = os.clock() }
192 slot.select('trace', trace.render) -- render trace information
194 local redirect_data = request.get_redirect_data()
196 -- log error and switch to error layout, unless success
197 if not success then
198 local errobj = error_info.errobj
199 local stacktrace = error_info.stacktrace
200 if not request.get_status() and not request.get_json_request_slots() then
201 request.set_status("500 Internal Server Error")
202 end
203 slot.set_layout('system_error')
204 slot.select('system_error', function()
205 if getmetatable(errobj) == mondelefant.errorobject_metatable then
206 slot.put(
207 "<p>Database error of class <b>",
208 encode.html(errobj.code),
209 "</b> occured:<br/><b>",
210 encode.html(errobj.message),
211 "</b></p>"
212 )
213 else
214 slot.put("<p><b>", encode.html(tostring(errobj)), "</b></p>")
215 end
216 slot.put("<p>Stack trace follows:<br/>")
217 slot.put(encode.html_newlines(encode.html(stacktrace)))
218 slot.put("</p>")
219 end)
220 elseif redirect_data then
221 local redirect_params = {}
222 for key, value in pairs(redirect_data.params) do
223 redirect_params[key] = value
224 end
225 local slot_dump = slot.dump_all()
226 if slot_dump ~= "" then
227 redirect_params.tempstore = tempstore.save(slot_dump)
228 end
229 local json_request_slots = request.get_json_request_slots()
230 if json_request_slots then
231 redirect_params["_webmcp_json_slots[]"] = json_request_slots
232 end
233 cgi.redirect(
234 encode.url{
235 base = request.get_absolute_baseurl(),
236 module = redirect_data.module,
237 view = redirect_data.view,
238 id = redirect_data.id,
239 params = redirect_params,
240 anchor = redirect_data.anchor
241 }
242 )
243 cgi.send_data()
244 end
246 if not success or not redirect_data then
248 local http_status = request.get_status()
249 if http_status then
250 cgi.set_status(http_status)
251 end
253 local json_request_slots = request.get_json_request_slots()
254 if json_request_slots then
255 cgi.set_content_type('application/json')
256 local data = {}
257 for idx, slot_ident in ipairs(json_request_slots) do
258 data[slot_ident] = slot.get_content(slot_ident)
259 end
260 cgi.send_data(encode.json(data))
261 else
262 cgi.set_content_type(slot.get_content_type())
263 cgi.send_data(slot.render_layout())
264 end
265 end
267 end