webmcp
view framework/env/request/handler.lua @ 360:785ff282af16
Changed version string to "2.0.1"
| author | jbe |
|---|---|
| date | Thu Mar 26 20:51:35 2015 +0100 (2015-03-26) |
| parents | 545ec2e3eafa |
| children | 4e03ecb28665 |
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 (see request.initialize()) are to be executed by mcp.lua before this function is invoked by mcp.lua.
9 --]]--
11 function request.handler(http_request)
12 request._http_request = http_request
13 local path = http_request.path
14 if path then
15 local relative_baseurl_elements = {}
16 for match in string.gmatch(path, "/") do
17 relative_baseurl_elements[#relative_baseurl_elements+1] = "../"
18 end
19 if #relative_baseurl_elements > 0 then
20 request._relative_baseurl = table.concat(relative_baseurl_elements)
21 else
22 request._relative_baseurl = "./"
23 end
24 else
25 request._relative_baseurl = nil
26 end
27 request._route = request.router()
28 do
29 local post_id = http_request.post_params["_webmcp_id"]
30 if post_id then
31 request._route.id = post_id
32 end
33 end
35 local success, error_info = xpcall(
36 function()
38 if not request._route then
39 request._route = {}
40 if request.get_404_route() then
41 request.set_status("404 Not Found")
42 request.forward(request.get_404_route())
43 else
44 error("Could not route request URL")
45 end
46 end
48 if request._route.static then
49 local subpath = request._route.static
50 for element in string.gmatch(subpath, "[^/]+") do
51 if element == "." or element == ".." then
52 subpath = nil
53 break
54 end
55 end
56 local fstat, f, errmsg
57 if subpath then
58 local filename = WEBMCP_BASE_PATH .. "static/" .. subpath
59 fstat, errmsg = extos.stat(filename)
60 if fstat then
61 if fstat.isdir then
62 errmsg = "Is a directory"
63 elseif not fstat.isreg then
64 errmsg = "Not a regular file"
65 else
66 f, errmsg = io.open(filename, "r")
67 end
68 end
69 end
70 if not f then
71 if request.get_404_route() then
72 request.set_status("404 Not Found")
73 request.forward(request.get_404_route())
74 else
75 error('Could not open static file "' .. subpath .. '": ' .. errmsg)
76 end
77 else
78 local d = assert(f:read("*a"))
79 f:close()
80 slot.put_into("data", d)
81 local filename_extension = string.match(subpath, "%.([^.]+)$")
82 slot.set_layout(nil, request._mime_types[filename_extension] or "application/octet-stream")
83 request.allow_caching()
84 return
85 end
86 end
88 -- restore slots if coming from http redirect
89 do
90 local tempstore_value = http_request.get_params["_tempstore"]
91 if tempstore_value then
92 trace.restore_slots{}
93 local blob = tempstore.pop(tempstore_value)
94 if blob then slot.restore_all(blob) end
95 end
96 end
98 if request.get_action() then
99 trace.request{
100 module = request.get_module(),
101 action = request.get_action()
102 }
103 if
104 not execute.action{
105 module = request.get_module(),
106 action = request.get_action(),
107 test_existence = true
108 } and
109 request.get_404_route()
110 then
111 request.set_status("404 Not Found")
112 request.forward(request.get_404_route())
113 else
114 if http_request.method ~= "POST" then
115 request.set_status("405 Method Not Allowed")
116 request.add_header("Allow", "POST")
117 error("Tried to invoke an action with a GET request.")
118 end
119 local action_status = execute.filtered_action{
120 module = request.get_module(),
121 action = request.get_action(),
122 }
123 if not request.is_rerouted() then
124 local routing_mode, routing_module, routing_view, routing_anchor
125 routing_mode = http_request.post_params["_webmcp_routing." .. action_status .. ".mode"]
126 routing_module = http_request.post_params["_webmcp_routing." .. action_status .. ".module"]
127 routing_view = http_request.post_params["_webmcp_routing." .. action_status .. ".view"]
128 routing_anchor = http_request.post_params["_webmcp_routing." .. action_status .. ".anchor"]
129 if not (routing_mode or routing_module or routing_view) then
130 action_status = "default"
131 routing_mode = http_request.post_params["_webmcp_routing.default.mode"]
132 routing_module = http_request.post_params["_webmcp_routing.default.module"]
133 routing_view = http_request.post_params["_webmcp_routing.default.view"]
134 routing_anchor = http_request.post_params["_webmcp_routing.default.anchor"]
135 end
136 assert(routing_module, "Routing information has no module.")
137 assert(routing_view, "Routing information has no view.")
138 if routing_mode == "redirect" then
139 local routing_params = {}
140 for key, value in pairs(request.get_param_strings{ method="POST", include_internal=true }) do
141 local status, stripped_key = string.match(
142 key, "^_webmcp_routing%.([^%.]*)%.params%.(.*)$"
143 )
144 if status == action_status then
145 routing_params[stripped_key] = value
146 end
147 end
148 request.redirect{
149 module = routing_module,
150 view = routing_view,
151 id = http_request.post_params["_webmcp_routing." .. action_status .. ".id"],
152 params = routing_params,
153 anchor = routing_anchor
154 }
155 elseif routing_mode == "forward" then
156 request.forward{ module = routing_module, view = routing_view }
157 else
158 error("Missing or unknown routing mode in request parameters.")
159 end
160 end
161 end
162 else
163 -- no action
164 trace.request{
165 module = request.get_module(),
166 view = request.get_view()
167 }
168 if
169 not execute.view{
170 module = request.get_module(),
171 view = request.get_view(),
172 test_existence = true
173 } and request.get_404_route()
174 then
175 request.set_status("404 Not Found")
176 request.forward(request.get_404_route())
177 end
178 end
180 if not request.get_redirect_data() then
181 request.process_forward()
182 local view = request.get_view()
183 if string.find(view, "^_") then
184 error("Tried to call a private view (prefixed with underscore).")
185 end
186 execute.filtered_view{
187 module = request.get_module(),
188 view = view,
189 }
190 end
192 end,
194 function(errobj)
195 return {
196 errobj = errobj,
197 stacktrace = string.gsub(
198 debug.traceback('', 2),
199 "^\r?\n?stack traceback:\r?\n?", ""
200 )
201 }
202 end
203 )
205 if not success then trace.error{} end
207 slot.select('trace', trace.render) -- render trace information
209 local redirect_data = request.get_redirect_data()
211 -- log error and switch to error layout, unless success
212 if not success then
213 local errobj = error_info.errobj
214 local stacktrace = error_info.stacktrace
215 if not request._status then
216 request._status = "500 Internal Server Error"
217 end
218 http_request:close_after_finish()
219 slot.set_layout('system_error')
220 slot.select('system_error', function()
221 if getmetatable(errobj) == mondelefant.errorobject_metatable then
222 slot.put(
223 "<p>Database error of class <b>",
224 encode.html(errobj.code),
225 "</b> occured:<br/><b>",
226 encode.html(errobj.message),
227 "</b></p>"
228 )
229 else
230 slot.put("<p><b>", encode.html(tostring(errobj)), "</b></p>")
231 end
232 slot.put("<p>Stack trace follows:<br/>")
233 slot.put(encode.html_newlines(encode.html(stacktrace)))
234 slot.put("</p>")
235 end)
236 elseif redirect_data then
237 redirect_data = table.new(redirect_data)
238 redirect_data.params = table.new(redirect_data.params)
239 local slot_dump = slot.dump_all()
240 if slot_dump ~= "" then
241 redirect_data.params._tempstore = tempstore.save(slot_dump)
242 end
243 http_request:send_status("303 See Other")
244 for i, header in ipairs(request._response_headers) do
245 http_request:send_header(header[1], header[2])
246 end
247 http_request:send_header("Location", encode.url(redirect_data))
248 http_request:finish()
249 end
251 if not success or not redirect_data then
253 http_request:send_status(request._status or "200 OK")
254 for i, header in ipairs(request._response_headers) do
255 http_request:send_header(header[1], header[2])
256 end
257 if not request._cache_manual then
258 local cache_time = request._cache_time
259 if request._cache and cache_time and cache_time > 0 then
260 http_request:send_header("Cache-Control", "max-age=" .. cache_time)
261 else
262 http_request:send_header("Cache-Control", "no-cache")
263 end
264 end
265 http_request:send_header("Content-Type", slot.get_content_type())
266 http_request:send_data(slot.render_layout())
267 http_request:finish()
268 end
270 return success
272 end