webmcp
view framework/env/request/handler.lua @ 351:b1748c6c3c89
extos.stat(...) returns false (instead of nil) if file does not exist; Added extos.lstat(...) and extos.fstat(...)
| author | jbe |
|---|---|
| date | Thu Mar 26 16:38:30 2015 +0100 (2015-03-26) |
| parents | 8cf6d927d074 |
| children | 2b5bdf9028fb |
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)
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 filename = WEBMCP_BASE_PATH .. "static/" .. request._route.static
60 -- TODO: move sanitizer from request.default_router(...) to request.handler(...)
61 local fstat, f, errmsg
62 fstat, errmsg = extos.stat(filename)
63 if fstat then
64 if fstat.isdir then
65 errmsg = "Is a directory"
66 elseif not fstat.isreg then
67 errmsg = "Not a regular file"
68 else
69 f, errmsg = io.open(filename, "r")
70 end
71 end
72 if not f then
73 request.set_status("404 Not Found")
74 if request.get_404_route() then
75 request.set_status("404 Not Found")
76 request.forward(request.get_404_route())
77 else
78 error('Could not open static file "' .. request._route.static .. '": ' .. errmsg)
79 end
80 else
81 local d = assert(f:read("*a"))
82 f:close()
83 slot.put_into("data", d)
84 local filename_extension = string.match(request._route.static, "%.([^.]+)$")
85 slot.set_layout(nil, request._mime_types[filename_extension] or "application/octet-stream")
86 request.allow_caching()
87 return
88 end
89 end
91 -- restore slots if coming from http redirect
92 do
93 local tempstore_value = http_request.get_params["_tempstore"]
94 if tempstore_value then
95 trace.restore_slots{}
96 local blob = tempstore.pop(tempstore_value)
97 if blob then slot.restore_all(blob) end
98 end
99 end
101 if request.get_action() then
102 trace.request{
103 module = request.get_module(),
104 action = request.get_action()
105 }
106 if
107 request.get_404_route() and
108 not file_exists(
109 encode.action_file_path{
110 module = request.get_module(),
111 action = request.get_action()
112 }
113 )
114 then
115 request.set_status("404 Not Found")
116 request.forward(request.get_404_route())
117 else
118 if http_request.method ~= "POST" then
119 request.set_status("405 Method Not Allowed")
120 request.add_header("Allow", "POST")
121 error("Tried to invoke an action with a GET request.")
122 end
123 local action_status = execute.filtered_action{
124 module = request.get_module(),
125 action = request.get_action(),
126 }
127 if not request.is_rerouted() then
128 local routing_mode, routing_module, routing_view, routing_anchor
129 routing_mode = http_request.post_params["_webmcp_routing." .. action_status .. ".mode"]
130 routing_module = http_request.post_params["_webmcp_routing." .. action_status .. ".module"]
131 routing_view = http_request.post_params["_webmcp_routing." .. action_status .. ".view"]
132 routing_anchor = http_request.post_params["_webmcp_routing." .. action_status .. ".anchor"]
133 if not (routing_mode or routing_module or routing_view) then
134 action_status = "default"
135 routing_mode = http_request.post_params["_webmcp_routing.default.mode"]
136 routing_module = http_request.post_params["_webmcp_routing.default.module"]
137 routing_view = http_request.post_params["_webmcp_routing.default.view"]
138 routing_anchor = http_request.post_params["_webmcp_routing.default.anchor"]
139 end
140 assert(routing_module, "Routing information has no module.")
141 assert(routing_view, "Routing information has no view.")
142 if routing_mode == "redirect" then
143 local routing_params = {}
144 for key, value in pairs(request.get_param_strings{ method="POST", include_internal=true }) do
145 local status, stripped_key = string.match(
146 key, "^_webmcp_routing%.([^%.]*)%.params%.(.*)$"
147 )
148 if status == action_status then
149 routing_params[stripped_key] = value
150 end
151 end
152 request.redirect{
153 module = routing_module,
154 view = routing_view,
155 id = http_request.post_params["_webmcp_routing." .. action_status .. ".id"],
156 params = routing_params,
157 anchor = routing_anchor
158 }
159 elseif routing_mode == "forward" then
160 request.forward{ module = routing_module, view = routing_view }
161 else
162 error("Missing or unknown routing mode in request parameters.")
163 end
164 end
165 end
166 else
167 -- no action
168 trace.request{
169 module = request.get_module(),
170 view = request.get_view()
171 }
172 if
173 request.get_404_route() and
174 not file_exists(
175 encode.view_file_path{
176 module = request.get_module(),
177 view = request.get_view()
178 }
179 )
180 then
181 request.set_status("404 Not Found")
182 request.forward(request.get_404_route())
183 end
184 end
186 if not request.get_redirect_data() then
187 request.process_forward()
188 local view = request.get_view()
189 if string.find(view, "^_") then
190 error("Tried to call a private view (prefixed with underscore).")
191 end
192 execute.filtered_view{
193 module = request.get_module(),
194 view = view,
195 }
196 end
198 end,
200 function(errobj)
201 return {
202 errobj = errobj,
203 stacktrace = string.gsub(
204 debug.traceback('', 2),
205 "^\r?\n?stack traceback:\r?\n?", ""
206 )
207 }
208 end
209 )
211 if not success then trace.error{} end
213 -- TODO: extend trace system to generally monitor execution time
214 -- trace.exectime{ real = extos.monotonic_hires_time(), cpu = os.clock() }
216 slot.select('trace', trace.render) -- render trace information
218 local redirect_data = request.get_redirect_data()
220 -- log error and switch to error layout, unless success
221 if not success then
222 local errobj = error_info.errobj
223 local stacktrace = error_info.stacktrace
224 if not request._status then
225 request._status = "500 Internal Server Error"
226 end
227 http_request:close_after_finish()
228 slot.set_layout('system_error')
229 slot.select('system_error', function()
230 if getmetatable(errobj) == mondelefant.errorobject_metatable then
231 slot.put(
232 "<p>Database error of class <b>",
233 encode.html(errobj.code),
234 "</b> occured:<br/><b>",
235 encode.html(errobj.message),
236 "</b></p>"
237 )
238 else
239 slot.put("<p><b>", encode.html(tostring(errobj)), "</b></p>")
240 end
241 slot.put("<p>Stack trace follows:<br/>")
242 slot.put(encode.html_newlines(encode.html(stacktrace)))
243 slot.put("</p>")
244 end)
245 elseif redirect_data then
246 redirect_data = table.new(redirect_data)
247 redirect_data.params = table.new(redirect_data.params)
248 local slot_dump = slot.dump_all()
249 if slot_dump ~= "" then
250 redirect_data.params._tempstore = tempstore.save(slot_dump)
251 end
252 http_request:send_status("303 See Other")
253 for i, header in ipairs(request._response_headers) do
254 http_request:send_header(header[1], header[2])
255 end
256 http_request:send_header("Location", encode.url(redirect_data))
257 http_request:finish()
258 end
260 if not success or not redirect_data then
262 http_request:send_status(request._status or "200 OK")
263 for i, header in ipairs(request._response_headers) do
264 http_request:send_header(header[1], header[2])
265 end
266 if not request._cache_manual then
267 local cache_time = request._cache_time
268 if request._cache and cache_time and cache_time > 0 then
269 http_request:send_header("Cache-Control", "max-age=" .. cache_time)
270 else
271 http_request:send_header("Cache-Control", "no-cache")
272 end
273 end
274 http_request:send_header("Content-Type", slot.get_content_type())
275 http_request:send_data(slot.render_layout())
276 http_request:finish()
277 end
279 return success
281 end