libs/httpd/luasrc/httpd/handler/file.lua

   1 --[[
   2
   3 HTTP server implementation for LuCI - luci handler
   4 (c) 2008 Steven Barth <steven@midlink.org>
   5
   6 Licensed under the Apache License, Version 2.0 (the "License");
   7 you may not use this file except in compliance with the License.
   8 You may obtain a copy of the License at
   9
  10         http://www.apache.org/licenses/LICENSE-2.0
  11
  12 $Id$
  13
  14 ]]--
  15
  16 module("luci.httpd.handler.file", package.seeall)
  17
  18 require("luci.httpd.module")
  19 require("luci.http.protocol.date")
  20 require("luci.http.protocol.mime")
  21 require("luci.http.protocol.conditionals")
  22 require("luci.fs")
  23 require("ltn12")
  24
  25 Simple = luci.util.class(luci.httpd.module.Handler)
  26 Response = luci.httpd.module.Response
  27
  28 function Simple.__init__(self, docroot, dirlist)
  29         luci.httpd.module.Handler.__init__(self)
  30         self.docroot = docroot
  31         self.dirlist = dirlist and true or false
  32         self.mime    = luci.http.protocol.mime
  33         self.date    = luci.http.protocol.date
  34         self.cond    = luci.http.protocol.conditionals
  35 end
  36
  37 function Simple.getfile(self, uri)
  38         local file = self.docroot .. uri:gsub("%.%./+", "")
  39         local stat = luci.fs.stat(file)
  40
  41         return file, stat
  42 end
  43
  44 function Simple.handle_get(self, request, sourcein, sinkerr)
  45         local file, stat = self:getfile(request.env.PATH_INFO)
  46
  47         if stat then
  48                 if stat.type == "regular" then
  49
  50                         -- Generate Entity Tag
  51                         local etag = self.cond.mk_etag( stat )
  52
  53                         -- Check conditionals
  54                         local ok, code, hdrs
  55
  56                         ok, code, hdrs = self.cond.if_modified_since( request, stat )
  57                         if ok then
  58                                 ok, code, hdrs = self.cond.if_match( request, stat )
  59                                 if ok then
  60                                         ok, code, hdrs = self.cond.if_unmodified_since( request, stat )
  61                                         if ok then
  62                                                 ok, code, hdrs = self.cond.if_none_match( request, stat )
  63                                                 if ok then
  64                                                         -- Send Response
  65                                                         return Response(
  66                                                                 200, {
  67                                                                         ["Date"]           = self.date.to_http( os.time() );
  68                                                                         ["Last-Modified"]  = self.date.to_http( stat.mtime );
  69                                                                         ["Content-Type"]   = self.mime.to_mime( file );
  70                                                                         ["Content-Length"] = stat.size;
  71                                                                         ["ETag"]           = etag;
  72                                                                 }
  73                                                         ), ltn12.source.file(io.open(file))
  74                                                 else
  75                                                         return Response( code, hdrs or { } ),
  76                                                                 ltn12.source.empty()
  77                                                 end
  78                                         else
  79                                                 return Response( code, hdrs or { } ),
  80                                                         ltn12.source.empty()
  81                                         end
  82                                 else
  83                                         return Response( code, hdrs or { } ),
  84                                                 ltn12.source.empty()
  85                                 end
  86                         else
  87                                 return Response( code, hdrs or { } ),
  88                                         ltn12.source.empty()
  89                         end
  90                 else
  91                         return self:failure(403, "Unable to transmit " .. stat.type .. " " .. file)
  92                 end
  93         else
  94                 return self:failure(404, "No such file: " .. file)
  95         end
  96 end
  97
  98 function Simple.handle_head(self, ...)
  99         local response, sourceout = self:handle_get(...)
 100         return response
 101 end