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 require("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.mime    = luci.http.protocol.mime
  34         self.date    = luci.http.protocol.date
  35         self.cond    = luci.http.protocol.conditionals
  36 end
  37
  38 function Simple.getfile(self, uri)
  39         local file = self.docroot .. uri:gsub("%.%./+", "")
  40         local stat = luci.fs.stat(file)
  41
  42         return file, stat
  43 end
  44
  45 function Simple.handle_get(self, request, sourcein, sinkerr)
  46         local file, stat = self:getfile(request.env.PATH_INFO)
  47
  48         if stat then
  49                 if stat.type == "regular" then
  50
  51                         -- Generate Entity Tag
  52                         local etag = self.cond.mk_etag( stat )
  53
  54                         -- Check conditionals
  55                         local ok, code, hdrs
  56
  57                         ok, code, hdrs = self.cond.if_modified_since( request, stat )
  58                         if ok then
  59                                 ok, code, hdrs = self.cond.if_match( request, stat )
  60                                 if ok then
  61                                         ok, code, hdrs = self.cond.if_unmodified_since( request, stat )
  62                                         if ok then
  63                                                 ok, code, hdrs = self.cond.if_none_match( request, stat )
  64                                                 if ok then
  65                                                         -- Send Response
  66                                                         return Response(
  67                                                                 200, {
  68                                                                         ["Date"]           = self.date.to_http( os.time() );
  69                                                                         ["Last-Modified"]  = self.date.to_http( stat.mtime );
  70                                                                         ["Content-Type"]   = self.mime.to_mime( file );
  71                                                                         ["Content-Length"] = stat.size;
  72                                                                         ["ETag"]           = etag;
  73                                                                 }
  74                                                         ), ltn12.source.file(io.open(file))
  75                                                 else
  76                                                         return Response( code, hdrs or { } )
  77                                                 end
  78                                         else
  79                                                 return Response( code, hdrs or { } )
  80                                         end
  81                                 else
  82                                         return Response( code, hdrs or { } )
  83                                 end
  84                         else
  85                                 return Response( code, hdrs or { } )
  86                         end
  87
  88                 elseif stat.type == "directory" then
  89
  90                         local ruri = request.request_uri:gsub("/$","")
  91                         local root = self.docroot:gsub("/$","")
  92
  93                         -- check for index files
  94                         local index_candidates = {
  95                                 "index.html", "index.htm", "default.html", "default.htm",
  96                                 "index.txt", "default.txt"
  97                         }
  98
  99                         -- try to find an index file and redirect to it
 100                         for i, candidate in ipairs( index_candidates ) do
 101                                 local istat = luci.fs.stat(
 102                                         root .. "/" .. ruri .. "/" .. candidate
 103                                 )
 104
 105                                 if istat ~= nil and istat.type == "regular" then
 106                                         return Response( 301, {
 107                                                 ["Location"] = ruri .. "/" .. candidate
 108                                         } ), ltn12.source.empty()
 109                                 end
 110                         end
 111
 112
 113                         local html = string.format(
 114                                 '<?xml version="1.0" encoding="UTF-8"?>\n' ..
 115                                 '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" '  ..
 116                                         '"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">\n' ..
 117                                 '<html xmlns="http://www.w3.org/1999/xhtml" '                ..
 118                                         'xml:lang="en" lang="en">\n'                             ..
 119                                 '<head>\n'                                                   ..
 120                                 '<title>Index of %s</title>\n'                               ..
 121                                 '</head><body><h1>Index of %s</h1><hr /><ul>',
 122                                         file, file
 123                         )
 124
 125                         for i, e in luci.util.vspairs( luci.fs.dir( file ) ) do
 126
 127                                 if e ~= '.' then
 128                                         local estat = luci.fs.stat( file .. "/" .. e )
 129
 130                                         if estat.type == "directory" then
 131                                                 html = html .. string.format(
 132                                                         '<li><p><a href="%s/%s/">%s/</a> '                         ..
 133                                                         '<small>(directory)</small><br />'                              ..
 134                                                         '<small>Changed: %s</small></li>',
 135                                                                 ruri, e, e,
 136                                                                 self.date.to_http( estat.mtime )
 137                                                 )
 138                                         else
 139                                                 html = html .. string.format(
 140                                                         '<li><p><a href="%s/%s">%s</a> '                         ..
 141                                                         '<small>(%s)</small><br />'                              ..
 142                                                         '<small>Size: %i Bytes | Changed: %s</small></li>',
 143                                                                 ruri, e, e, self.mime.to_mime( e ),
 144                                                                 estat.size, self.date.to_http( estat.mtime )
 145                                                 )
 146                                         end
 147                                 end
 148                         end
 149
 150                         html = html .. '</ul><hr /></body></html>'
 151
 152                         return Response(
 153                                 200, {
 154                                         ["Date"]         = self.date.to_http( os.time() );
 155                                         ["Content-Type"] = "text/html";
 156                                 }
 157                         ), ltn12.source.string(html)
 158                 else
 159                         return self:failure(403, "Unable to transmit " .. stat.type .. " " .. file)
 160                 end
 161         else
 162                 return self:failure(404, "No such file: " .. file)
 163         end
 164 end
 165
 166 function Simple.handle_head(self, ...)
 167         local response, sourceout = self:handle_get(...)
 168         return response
 169 end