webmcp
view framework/env/request/handler.lua @ 334:ac44b171aa09
merge
| author | jbe |
|---|---|
| date | Tue Mar 24 17:27:41 2015 +0100 (2015-03-24) |
| parents | 3db9b672ee73 |
| children | 169dfbd0246a |
line source
1 --[[--
2 success = -- false if an error occurred, true otherwise
3 request.handler(
4 http_request, -- HTTP request object
5 )
7 Called by mcp.lua to process an HTTP request. Calls request.router(), and handles the request. Note: request initializers will have to be (automatically) executed before this function is invoked by mcp.lua.
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 request._http_request = http_request
23 local path = http_request.path
24 if path then
25 local relative_baseurl_elements = {}
26 for match in string.gmatch(path, "/") do
27 relative_baseurl_elements[#relative_baseurl_elements+1] = "../"
28 end
29 if #relative_baseurl_elements > 0 then
30 request._relative_baseurl = table.concat(relative_baseurl_elements)
31 else
32 request._relative_baseurl = "./"
33 end
34 else
35 request._relative_baseurl = nil
36 end
37 request._route = request.router()
38 do
39 local post_id = http_request.post_params["_webmcp_id"]
40 if post_id then
41 request._route.id = post_id
42 end
43 end
45 local success, error_info = xpcall(
46 function()
48 if not request._route then
49 request._route = {}
50 if request.get_404_route() then
51 request.set_status("404 Not Found")
52 request.forward(request.get_404_route())
53 else
54 error("Could not route request URL")
55 end
56 end
58 if request._route.static then
59 local f, errmsg = io.open(WEBMCP_BASE_PATH .. "static/" .. request._route.static, "r")
60 if not f then
61 request.set_status("404 Not Found")
62 if request.get_404_route() then
63 request.set_status("404 Not Found")
64 request.forward(request.get_404_route())
65 else
66 error('Could not open static file "' .. request._route.static .. '": ' .. errmsg)
67 end
68 else
69 local d = assert(f:read("*a"))
70 f:close()
71 slot.put_into("data", d)
72 local filename_extension = string.match(request._route.static, "%.([^.]+)$")
73 slot.set_layout(nil, request._mime_types[filename_extension] or "application/octet-stream")
74 request.allow_caching()
75 return
76 end
77 end
79 -- restore slots if coming from http redirect
80 do
81 local tempstore_value = http_request.get_params["_tempstore"]
82 if tempstore_value then
83 trace.restore_slots{}
84 local blob = tempstore.pop(tempstore_value)
85 if blob then slot.restore_all(blob) end
86 end
87 end
89 if request.get_action() then
90 trace.request{
91 module = request.get_module(),
92 action = request.get_action()
93 }
94 if
95 request.get_404_route() and
96 not file_exists(
97 encode.action_file_path{
98 module = request.get_module(),
99 action = request.get_action()
100 }
101 )
102 then
103 request.set_status("404 Not Found")
104 request.forward(request.get_404_route())
105 else
106 if http_request.method ~= "POST" then
107 request.set_status("405 Method Not Allowed")
108 request.add_header("Allow", "POST")
109 error("Tried to invoke an action with a GET request.")
110 end
111 local action_status = execute.filtered_action{
112 module = request.get_module(),
113 action = request.get_action(),
114 }
115 if not request.is_rerouted() then
116 local routing_mode, routing_module, routing_view, routing_anchor
117 routing_mode = http_request.post_params["_webmcp_routing." .. action_status .. ".mode"]
118 routing_module = http_request.post_params["_webmcp_routing." .. action_status .. ".module"]
119 routing_view = http_request.post_params["_webmcp_routing." .. action_status .. ".view"]
120 routing_anchor = http_request.post_params["_webmcp_routing." .. action_status .. ".anchor"]
121 if not (routing_mode or routing_module or routing_view) then
122 action_status = "default"
123 routing_mode = http_request.post_params["_webmcp_routing.default.mode"]
124 routing_module = http_request.post_params["_webmcp_routing.default.module"]
125 routing_view = http_request.post_params["_webmcp_routing.default.view"]
126 routing_anchor = http_request.post_params["_webmcp_routing.default.anchor"]
127 end
128 assert(routing_module, "Routing information has no module.")
129 assert(routing_view, "Routing information has no view.")
130 if routing_mode == "redirect" then
131 local routing_params = {}
132 for key, value in pairs(request.get_param_strings{ method="POST", include_internal=true }) do
133 local status, stripped_key = string.match(
134 key, "^_webmcp_routing%.([^%.]*)%.params%.(.*)$"
135 )
136 if status == action_status then
137 routing_params[stripped_key] = value
138 end
139 end
140 request.redirect{
141 module = routing_module,
142 view = routing_view,
143 id = http_request.post_params["_webmcp_routing." .. action_status .. ".id"],
144 params = routing_params,
145 anchor = routing_anchor
146 }
147 elseif routing_mode == "forward" then
148 request.forward{ module = routing_module, view = routing_view }
149 else
150 error("Missing or unknown routing mode in request parameters.")
151 end
152 end
153 end
154 else
155 -- no action
156 trace.request{
157 module = request.get_module(),
158 view = request.get_view()
159 }
160 if
161 request.get_404_route() and
162 not file_exists(
163 encode.view_file_path{
164 module = request.get_module(),
165 view = request.get_view()
166 }
167 )
168 then
169 request.set_status("404 Not Found")
170 request.forward(request.get_404_route())
171 end
172 end
174 if not request.get_redirect_data() then
175 request.process_forward()
176 local view = request.get_view()
177 if string.find(view, "^_") then
178 error("Tried to call a private view (prefixed with underscore).")
179 end
180 execute.filtered_view{
181 module = request.get_module(),
182 view = view,
183 }
184 end
186 end,
188 function(errobj)
189 return {
190 errobj = errobj,
191 stacktrace = string.gsub(
192 debug.traceback('', 2),
193 "^\r?\n?stack traceback:\r?\n?", ""
194 )
195 }
196 end
197 )
199 if not success then trace.error{} end
201 -- TODO: extend trace system to generally monitor execution time
202 -- trace.exectime{ real = extos.monotonic_hires_time(), cpu = os.clock() }
204 slot.select('trace', trace.render) -- render trace information
206 local redirect_data = request.get_redirect_data()
208 -- log error and switch to error layout, unless success
209 if not success then
210 local errobj = error_info.errobj
211 local stacktrace = error_info.stacktrace
212 if not request._status then
213 request._status = "500 Internal Server Error"
214 end
215 http_request:close_after_finish()
216 slot.set_layout('system_error')
217 slot.select('system_error', function()
218 if getmetatable(errobj) == mondelefant.errorobject_metatable then
219 slot.put(
220 "<p>Database error of class <b>",
221 encode.html(errobj.code),
222 "</b> occured:<br/><b>",
223 encode.html(errobj.message),
224 "</b></p>"
225 )
226 else
227 slot.put("<p><b>", encode.html(tostring(errobj)), "</b></p>")
228 end
229 slot.put("<p>Stack trace follows:<br/>")
230 slot.put(encode.html_newlines(encode.html(stacktrace)))
231 slot.put("</p>")
232 end)
233 elseif redirect_data then
234 redirect_data = table.new(redirect_data)
235 redirect_data.params = table.new(redirect_data.params)
236 local slot_dump = slot.dump_all()
237 if slot_dump ~= "" then
238 redirect_data.params._tempstore = tempstore.save(slot_dump)
239 end
240 http_request:send_status("303 See Other")
241 for i, header in ipairs(request._response_headers) do
242 http_request:send_header(header[1], header[2])
243 end
244 http_request:send_header("Location", encode.url(redirect_data))
245 http_request:finish()
246 end
248 if not success or not redirect_data then
250 http_request:send_status(request._status or "200 OK")
251 for i, header in ipairs(request._response_headers) do
252 http_request:send_header(header[1], header[2])
253 end
254 if not request._cache_manual then
255 local cache_time = request._cache_time
256 if request._cache and cache_time and cache_time > 0 then
257 http_request:send_header("Cache-Control", "max-age=" .. cache_time)
258 else
259 http_request:send_header("Cache-Control", "no-cache")
260 end
261 end
262 http_request:send_header("Content-Type", slot.get_content_type())
263 http_request:send_data(slot.render_layout())
264 http_request:finish()
265 end
267 return success
269 end