libs/lucittpd/luasrc/ttpd/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 local ipairs, type, tonumber = ipairs, type, tonumber
  18 local io = require "io"
  19 local os = require "os"
  20 local fs = require "luci.fs"
  21 local util = require "luci.util"
  22 local ltn12 = require "luci.ltn12"
  23 local mod = require "luci.ttpd.module"
  24 local srv = require "luci.ttpd.server"
  25 local string = require "string"
  26
  27 local prot = require "luci.http.protocol"
  28 local date = require "luci.http.protocol.date"
  29 local mime = require "luci.http.protocol.mime"
  30 local cond = require "luci.http.protocol.conditionals"
  31
  32 module "luci.ttpd.handler.file"
  33
  34 Simple = util.class(mod.Handler)
  35 Response = mod.Response
  36
  37 function Simple.__init__(self, docroot, dirlist)
  38         mod.Handler.__init__(self)
  39         self.docroot = docroot
  40         self.dirlist = dirlist and true or false
  41 end
  42
  43 function Simple.parse_range(self, request, size)
  44         if not request.headers.Range then
  45                 return true
  46         end
  47
  48         local from, to = request.headers.Range:match("bytes=([0-9]*)-([0-9]*)")
  49         if not (from or to) then
  50                 return true
  51         end
  52
  53         from, to = tonumber(from), tonumber(to)
  54         if not (from or to) then
  55                 return true
  56         elseif not from then
  57                 from, to = size - to, size - 1
  58         elseif not to then
  59                 to = size - 1
  60         end
  61
  62         -- Not satisfiable
  63         if from >= size then
  64                 return false
  65         end
  66
  67         -- Normalize
  68         if to >= size then
  69                 to = size - 1
  70         end
  71
  72         local range = "bytes " .. from .. "-" .. to .. "/" .. size
  73         return from, (1 + to - from), range
  74 end
  75
  76 function Simple.getfile(self, uri)
  77         local file = self.docroot .. uri:gsub("%.%./+", "")
  78         local stat = fs.stat(file)
  79
  80         return file, stat
  81 end
  82
  83 function Simple.handle_get(self, request, sourcein, sinkerr)
  84         local file, stat = self:getfile( prot.urldecode( request.env.PATH_INFO, true ) )
  85
  86         if stat then
  87                 if stat.type == "regular" then
  88
  89                         -- Generate Entity Tag
  90                         local etag = cond.mk_etag( stat )
  91
  92                         -- Check conditionals
  93                         local ok, code, hdrs
  94
  95                         ok, code, hdrs = cond.if_modified_since( request, stat )
  96                         if ok then
  97                                 ok, code, hdrs = cond.if_match( request, stat )
  98                                 if ok then
  99                                         ok, code, hdrs = cond.if_unmodified_since( request, stat )
 100                                         if ok then
 101                                                 ok, code, hdrs = cond.if_none_match( request, stat )
 102                                                 if ok then
 103                                                         local f, err = io.open(file)
 104
 105                                                         if f then
 106                                                                 local code = 200
 107                                                                 local o, s, r = self:parse_range(request, stat.size)
 108
 109                                                                 if not o then
 110                                                                         return self:failure(416, "Invalid Range")
 111                                                                 end
 112
 113                                                                 local headers = {
 114                                                                         ["Last-Modified"]  = date.to_http( stat.mtime ),
 115                                                                         ["Content-Type"]   = mime.to_mime( file ),
 116                                                                         ["ETag"]           = etag,
 117                                                                         ["Accept-Ranges"]  = "bytes",
 118                                                                 }
 119
 120                                                                 if o == true then
 121                                                                         o = 0
 122                                                                         s = stat.size
 123                                                                 else
 124                                                                         code = 206
 125                                                                         headers["Content-Range"] = r
 126                                                                 end
 127
 128                                                                 headers["Content-Length"] = s
 129
 130                                                                 -- Send Response
 131                                                                 return Response(code, headers),
 132                                                                         srv.IOResource(f, o, s)
 133                                                         else
 134                                                                 return self:failure( 403, err:gsub("^.+: ", "") )
 135                                                         end
 136                                                 else
 137                                                         return Response( code, hdrs or { } )
 138                                                 end
 139                                         else
 140                                                 return Response( code, hdrs or { } )
 141                                         end
 142                                 else
 143                                         return Response( code, hdrs or { } )
 144                                 end
 145                         else
 146                                 return Response( code, hdrs or { } )
 147                         end
 148
 149                 elseif stat.type == "directory" then
 150
 151                         local ruri = request.request_uri:gsub("/$","")
 152                         local duri = prot.urldecode( ruri, true )
 153                         local root = self.docroot:gsub("/$","")
 154
 155                         -- check for index files
 156                         local index_candidates = {
 157                                 "index.html", "index.htm", "default.html", "default.htm",
 158                                 "index.txt", "default.txt"
 159                         }
 160
 161                         -- try to find an index file and redirect to it
 162                         for i, candidate in ipairs( index_candidates ) do
 163                                 local istat = fs.stat(
 164                                         root .. "/" .. duri .. "/" .. candidate
 165                                 )
 166
 167                                 if istat ~= nil and istat.type == "regular" then
 168                                         return Response( 302, {
 169                                                 ["Location"] = ruri .. "/" .. candidate
 170                                         } )
 171                                 end
 172                         end
 173
 174
 175                         local html = string.format(
 176                                 '<?xml version="1.0" encoding="ISO-8859-15"?>\n' ..
 177                                 '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" '  ..
 178                                         '"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">\n' ..
 179                                 '<html xmlns="http://www.w3.org/1999/xhtml" '                ..
 180                                         'xml:lang="en" lang="en">\n'                             ..
 181                                 '<head>\n'                                                   ..
 182                                 '<title>Index of %s/</title>\n'                              ..
 183                                 '<style type="text/css"><!--\n'                              ..
 184                                         'body { background-color:#fbb034; color:#ffffff } '      ..
 185                                         'li { border-bottom:1px dotted #CCCCCC; padding:3px } '  ..
 186                                         'small { font-size:60%%; color:#ffffff } '               ..
 187                                         'p { margin:0 }'                                         ..
 188                                 '\n--></style></head><body><h1>Index of %s/</h1><hr /><ul>',
 189                                         duri, duri
 190                         )
 191
 192                         local entries = fs.dir( file )
 193
 194                         if type(entries) == "table" then
 195                                 for i, e in util.spairs(
 196                                         entries, function(a,b)
 197                                                 if entries[a] == '..' then
 198                                                         return true
 199                                                 elseif entries[b] == '..' then
 200                                                         return false
 201                                                 else
 202                                                         return ( entries[a] < entries[b] )
 203                                                 end
 204                                         end
 205                                 ) do
 206                                         if e ~= '.' and ( e == '..' or e:sub(1,1) ~= '.' ) then
 207                                                 local estat = fs.stat( file .. "/" .. e )
 208
 209                                                 if estat.type == "directory" then
 210                                                         html = html .. string.format(
 211                                                                 '<li><p><a href="%s/%s/">%s/</a> '           ..
 212                                                                 '<small>(directory)</small><br />'           ..
 213                                                                 '<small>Changed: %s</small></li>',
 214                                                                         ruri, prot.urlencode( e ), e,
 215                                                                         date.to_http( estat.mtime )
 216                                                         )
 217                                                 else
 218                                                         html = html .. string.format(
 219                                                                 '<li><p><a href="%s/%s">%s</a> '             ..
 220                                                                 '<small>(%s)</small><br />'                  ..
 221                                                                 '<small>Size: %i Bytes | '                   ..
 222                                                                         'Changed: %s</small></li>',
 223                                                                         ruri, prot.urlencode( e ), e,
 224                                                                         mime.to_mime( e ),
 225                                                                         estat.size, date.to_http( estat.mtime )
 226                                                         )
 227                                                 end
 228                                         end
 229                                 end
 230
 231                                 html = html .. '</ul><hr /></body></html>'
 232
 233                                 return Response(
 234                                         200, {
 235                                                 ["Date"]         = date.to_http( os.time() );
 236                                                 ["Content-Type"] = "text/html; charset=ISO-8859-15";
 237                                         }
 238                                 ), ltn12.source.string(html)
 239                         else
 240                                 return self:failure(403, "Permission denied")
 241                         end
 242                 else
 243                         return self:failure(403, "Unable to transmit " .. stat.type .. " " .. file)
 244                 end
 245         else
 246                 return self:failure(404, "No such file: " .. file)
 247         end
 248 end
 249
 250 function Simple.handle_head(self, ...)
 251         return (self:handle_get(...))
 252 end