require 'time'
require 'rack/utils'
require 'rack/mime'
module Rack
# Rack::Directory serves entries below the +root+ given, according to the
# path info of the Rack request. If a directory is found, the file's contents
# will be presented in an html based index. If a file is found, the env will
# be passed to the specified +app+.
#
# If +app+ is not specified, a Rack::File of the same +root+ will be used.
class Directory
DIR_FILE = "<tr><td class='name'><a href='%s'>%s</a></td><td class='size'>%s</td><td class='type'>%s</td><td class='mtime'>%s</td></tr>"
DIR_PAGE = <<-PAGE
<html><head>
<title>%s</title>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<style type='text/css'>
table { width:100%%; }
.name { text-align:left; }
.size, .mtime { text-align:right; }
.type { width:11em; }
.mtime { width:15em; }
</style>
</head><body>
<h1>%s</h1>
<hr />
<table>
<tr>
<th class='name'>Name</th>
<th class='size'>Size</th>
<th class='type'>Type</th>
<th class='mtime'>Last Modified</th>
</tr>
%s
</table>
<hr />
</body></html>
PAGE
attr_reader :files
attr_accessor :root, :path
def initialize(root, app=nil)
@root = F.expand_path(root)
@app = app || Rack::File.new(@root)
end
def call(env)
dup._call(env)
end
F = ::File
def _call(env)
@env = env
@script_name = env[SCRIPT_NAME]
@path_info = Utils.unescape(env[PATH_INFO])
if forbidden = check_forbidden
forbidden
else
@path = F.join(@root, @path_info)
list_path
end
end
def check_forbidden
return unless @path_info.include? ".."
body = "Forbidden\n"
size = Rack::Utils.bytesize(body)
return [403, {"Content-Type" => "text/plain",
CONTENT_LENGTH => size.to_s,
"X-Cascade" => "pass"}, [body]]
end
def list_directory
@files = [['../','Parent Directory','','','']]
glob = F.join(@path, '*')
url_head = (@script_name.split('/') + @path_info.split('/')).map do |part|
Rack::Utils.escape part
end
Dir[glob].sort.each do |node|
stat = stat(node)
next unless stat
basename = F.basename(node)
ext = F.extname(node)
url = F.join(*url_head + [Rack::Utils.escape(basename)])
size = stat.size
type = stat.directory? ? 'directory' : Mime.mime_type(ext)
size = stat.directory? ? '-' : filesize_format(size)
mtime = stat.mtime.httpdate
url << '/' if stat.directory?
basename << '/' if stat.directory?
@files << [ url, basename, size, type, mtime ]
end
return [ 200, { CONTENT_TYPE =>'text/html; charset=utf-8'}, self ]
end
def stat(node, max = 10)
F.stat(node)
rescue Errno::ENOENT, Errno::ELOOP
return nil
end
# TODO: add correct response if not readable, not sure if 404 is the best
# option
def list_path
@stat = F.stat(@path)
if @stat.readable?
return @app.call(@env) if @stat.file?
return list_directory if @stat.directory?
else
raise Errno::ENOENT, 'No such file or directory'
end
rescue Errno::ENOENT, Errno::ELOOP
return entity_not_found
end
def entity_not_found
body = "Entity not found: #{@path_info}\n"
size = Rack::Utils.bytesize(body)
return [404, {"Content-Type" => "text/plain",
CONTENT_LENGTH => size.to_s,
"X-Cascade" => "pass"}, [body]]
end
def each
show_path = Rack::Utils.escape_html(@path.sub(/^#{@root}/,''))
files = @files.map{|f| DIR_FILE % DIR_FILE_escape(*f) }*"\n"
page = DIR_PAGE % [ show_path, show_path , files ]
page.each_line{|l| yield l }
end
# Stolen from Ramaze
FILESIZE_FORMAT = [
['%.1fT', 1 << 40],
['%.1fG', 1 << 30],
['%.1fM', 1 << 20],
['%.1fK', 1 << 10],
]
def filesize_format(int)
FILESIZE_FORMAT.each do |format, size|
return format % (int.to_f / size) if int >= size
end
int.to_s + 'B'
end
private
# Assumes url is already escaped.
def DIR_FILE_escape url, *html
[url, *html.map { |e| Utils.escape_html(e) }]
end
end
end
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