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

   1 --[[
   2
   3 HTTP server implementation for LuCI - file handler
   4 (c) 2008 Steven Barth <steven@midlink.org>
   5 (c) 2008 Freifunk Leipzig / Jo-Philipp Wich <xm@leipzig.freifunk.net>
   6
   7 Licensed under the Apache License, Version 2.0 (the "License");
   8 you may not use this file except in compliance with the License.
   9 You may obtain a copy of the License at
  10
  11         http://www.apache.org/licenses/LICENSE-2.0
  12
  13 $Id$
  14
  15 ]]--
  16
  17 module("luci.httpd.handler.file", package.seeall)
  18
  19 require("luci.httpd.module")
  20 require("luci.http.protocol.date")
  21 require("luci.http.protocol.mime")
  22 require("luci.http.protocol.conditionals")
  23 require("luci.fs")
  24 local ltn12 = require("luci.ltn12")
  25
  26 Simple = luci.util.class(luci.httpd.module.Handler)
  27 Response = luci.httpd.module.Response
  28
  29 function Simple.__init__(self, docroot, dirlist)
  30         luci.httpd.module.Handler.__init__(self)
  31         self.docroot = docroot
  32         self.dirlist = dirlist and true or false
  33         self.proto   = luci.http.protocol
  34         self.mime    = luci.http.protocol.mime
  35         self.date    = luci.http.protocol.date
  36         self.cond    = luci.http.protocol.conditionals
  37 end
  38
  39 function Simple.getfile(self, uri)
  40         local file = self.docroot .. uri:gsub("%.%./+", "")
  41         local stat = luci.fs.stat(file)
  42
  43         return file, stat
  44 end
  45
  46 function Simple.handle_get(self, request, sourcein, sinkerr)
  47         local file, stat = self:getfile( self.proto.urldecode( request.env.PATH_INFO, true ) )
  48
  49         if stat then
  50                 if stat.type == "regular" then
  51
  52                         -- Generate Entity Tag
  53                         local etag = self.cond.mk_etag( stat )
  54
  55                         -- Check conditionals
  56                         local ok, code, hdrs
  57
  58                         ok, code, hdrs = self.cond.if_modified_since( request, stat )
  59                         if ok then
  60                                 ok, code, hdrs = self.cond.if_match( request, stat )
  61                                 if ok then
  62                                         ok, code, hdrs = self.cond.if_unmodified_since( request, stat )
  63                                         if ok then
  64                                                 ok, code, hdrs = self.cond.if_none_match( request, stat )
  65                                                 if ok then
  66                                                         local f, err = io.open(file)
  67
  68                                                         if f then
  69                                                                 -- Send Response
  70                                                                 return Response(
  71                                                                         200, {
  72                                                                                 ["Date"]           = self.date.to_http( os.time() );
  73                                                                                 ["Last-Modified"]  = self.date.to_http( stat.mtime );
  74                                                                                 ["Content-Type"]   = self.mime.to_mime( file );
  75                                                                                 ["Content-Length"] = stat.size;
  76                                                                                 ["ETag"]           = etag;
  77                                                                         }
  78                                                                 ), ltn12.source.file(f)
  79                                                         else
  80                                                                 return self:failure( 403, err:gsub("^.+: ", "") )
  81                                                         end
  82                                                 else
  83                                                         return Response( code, hdrs or { } )
  84                                                 end
  85                                         else
  86                                                 return Response( code, hdrs or { } )
  87                                         end
  88                                 else
  89                                         return Response( code, hdrs or { } )
  90                                 end
  91                         else
  92                                 return Response( code, hdrs or { } )
  93                         end
  94
  95                 elseif stat.type == "directory" then
  96
  97                         local ruri = request.request_uri:gsub("/$","")
  98                         local duri = self.proto.urldecode( ruri, true )
  99                         local root = self.docroot:gsub("/$","")
 100
 101                         -- check for index files
 102                         local index_candidates = {
 103                                 "index.html", "index.htm", "default.html", "default.htm",
 104                                 "index.txt", "default.txt"
 105                         }
 106
 107                         -- try to find an index file and redirect to it
 108                         for i, candidate in ipairs( index_candidates ) do
 109                                 local istat = luci.fs.stat(
 110                                         root .. "/" .. duri .. "/" .. candidate
 111                                 )
 112
 113                                 if istat ~= nil and istat.type == "regular" then
 114                                         return Response( 301, {
 115                                                 ["Location"] = ruri .. "/" .. candidate
 116                                         } ), ltn12.source.empty()
 117                                 end
 118                         end
 119
 120
 121                         local html = string.format(
 122                                 '<?xml version="1.0" encoding="ISO-8859-15"?>\n' ..
 123                                 '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" '  ..
 124                                         '"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">\n' ..
 125                                 '<html xmlns="http://www.w3.org/1999/xhtml" '                ..
 126                                         'xml:lang="en" lang="en">\n'                             ..
 127                                 '<head>\n'                                                   ..
 128                                 '<title>Index of %s/</title>\n'                              ..
 129                                 '<style type="text/css"><!--\n'                              ..
 130                                         'body { background-color:#FFFFFF; color:#000000 } '      ..
 131                                         'li { border-bottom:1px dotted #CCCCCC; padding:3px } '  ..
 132                                         'small { font-size:60%%; color:#999999 } '               ..
 133                                         'p { margin:0 }'                                         ..
 134                                 '\n--></style></head><body><h1>Index of %s/</h1><hr /><ul>',
 135                                         duri, duri
 136                         )
 137
 138                         local entries = luci.fs.dir( file )
 139
 140                         if type(entries) == "table" then
 141                                 for i, e in luci.util.spairs(
 142                                         entries, function(a,b)
 143                                                 if entries[a] == '..' then
 144                                                         return true
 145                                                 elseif entries[b] == '..' then
 146                                                         return false
 147                                                 else
 148                                                         return ( entries[a] < entries[b] )
 149                                                 end
 150                                         end
 151                                 ) do
 152                                         if e ~= '.' and ( e == '..' or e:sub(1,1) ~= '.' ) then
 153                                                 local estat = luci.fs.stat( file .. "/" .. e )
 154
 155                                                 if estat.type == "directory" then
 156                                                         html = html .. string.format(
 157                                                                 '<li><p><a href="%s/%s/">%s/</a> '           ..
 158                                                                 '<small>(directory)</small><br />'           ..
 159                                                                 '<small>Changed: %s</small></li>',
 160                                                                         ruri, self.proto.urlencode( e ), e,
 161                                                                         self.date.to_http( estat.mtime )
 162                                                         )
 163                                                 else
 164                                                         html = html .. string.format(
 165                                                                 '<li><p><a href="%s/%s">%s</a> '             ..
 166                                                                 '<small>(%s)</small><br />'                  ..
 167                                                                 '<small>Size: %i Bytes | '                   ..
 168                                                                         'Changed: %s</small></li>',
 169                                                                         ruri, self.proto.urlencode( e ), e,
 170                                                                         self.mime.to_mime( e ),
 171                                                                         estat.size, self.date.to_http( estat.mtime )
 172                                                         )
 173                                                 end
 174                                         end
 175                                 end
 176
 177                                 html = html .. '</ul><hr /></body></html>'
 178
 179                                 return Response(
 180                                         200, {
 181                                                 ["Date"]         = self.date.to_http( os.time() );
 182                                                 ["Content-Type"] = "text/html; charset=ISO-8859-15";
 183                                         }
 184                                 ), ltn12.source.string(html)
 185                         else
 186                                 return self:failure(403, "Permission denied")
 187                         end
 188                 else
 189                         return self:failure(403, "Unable to transmit " .. stat.type .. " " .. file)
 190                 end
 191         else
 192                 return self:failure(404, "No such file: " .. file)
 193         end
 194 end
 195
 196 function Simple.handle_head(self, ...)
 197         local response, sourceout = self:handle_get(...)
 198         return response
 199 end