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| | # frozen_string_literal: true
require 'time'
require 'rack/utils'
require 'rack/mime'
require 'rack/files'
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::Files 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
class DirectoryBody < Struct.new(:root, :path, :files)
def each
show_path = Rack::Utils.escape_html(path.sub(/^#{root}/, ''))
listings = files.map{|f| DIR_FILE % DIR_FILE_escape(*f) } * "\n"
page = DIR_PAGE % [ show_path, show_path, listings ]
page.each_line{|l| yield l }
end
private
# Assumes url is already escaped.
def DIR_FILE_escape url, *html
[url, *html.map { |e| Utils.escape_html(e) }]
end
end
attr_reader :root, :path
def initialize(root, app = nil)
@root = ::File.expand_path(root)
@app = app || Rack::Files.new(@root)
@head = Rack::Head.new(lambda { |env| get env })
end
def call(env)
# strip body if this is a HEAD call
@head.call env
end
def get(env)
script_name = env[SCRIPT_NAME]
path_info = Utils.unescape_path(env[PATH_INFO])
if bad_request = check_bad_request(path_info)
bad_request
elsif forbidden = check_forbidden(path_info)
forbidden
else
path = ::File.join(@root, path_info)
list_path(env, path, path_info, script_name)
end
end
def check_bad_request(path_info)
return if Utils.valid_path?(path_info)
body = "Bad Request\n"
size = body.bytesize
return [400, { CONTENT_TYPE => "text/plain",
CONTENT_LENGTH => size.to_s,
"X-Cascade" => "pass" }, [body]]
end
def check_forbidden(path_info)
return unless path_info.include? ".."
body = "Forbidden\n"
size = body.bytesize
return [403, { CONTENT_TYPE => "text/plain",
CONTENT_LENGTH => size.to_s,
"X-Cascade" => "pass" }, [body]]
end
def list_directory(path_info, path, script_name)
files = [['../', 'Parent Directory', '', '', '']]
glob = ::File.join(path, '*')
url_head = (script_name.split('/') + path_info.split('/')).map do |part|
Rack::Utils.escape_path part
end
Dir[glob].sort.each do |node|
stat = stat(node)
next unless stat
basename = ::File.basename(node)
ext = ::File.extname(node)
url = ::File.join(*url_head + [Rack::Utils.escape_path(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' }, DirectoryBody.new(@root, path, files) ]
end
def stat(node)
::File.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(env, path, path_info, script_name)
stat = ::File.stat(path)
if stat.readable?
return @app.call(env) if stat.file?
return list_directory(path_info, path, script_name) if stat.directory?
else
raise Errno::ENOENT, 'No such file or directory'
end
rescue Errno::ENOENT, Errno::ELOOP
return entity_not_found(path_info)
end
def entity_not_found(path_info)
body = "Entity not found: #{path_info}\n"
size = body.bytesize
return [404, { CONTENT_TYPE => "text/plain",
CONTENT_LENGTH => size.to_s,
"X-Cascade" => "pass" }, [body]]
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}B"
end
end
end
|