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# frozen_string_literal: true
require 'time'
require_relative 'constants'
require_relative 'utils'
require_relative 'head'
require_relative 'mime'
require_relative '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>\n"
DIR_PAGE_HEADER = <<-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>
PAGE
DIR_PAGE_FOOTER = <<-PAGE
</table>
<hr />
</body></html>
PAGE
# Body class for directory entries, showing an index page with links
# to each file.
class DirectoryBody < Struct.new(:root, :path, :files)
# Yield strings for each part of the directory entry
def each
show_path = Utils.escape_html(path.sub(/^#{root}/, ''))
yield(DIR_PAGE_HEADER % [ show_path, show_path ])
unless path.chomp('/') == root
yield(DIR_FILE % DIR_FILE_escape(files.call('..')))
end
Dir.foreach(path) do |basename|
next if basename.start_with?('.')
next unless f = files.call(basename)
yield(DIR_FILE % DIR_FILE_escape(f))
end
yield(DIR_PAGE_FOOTER)
end
private
# Escape each element in the array of html strings.
def DIR_FILE_escape(htmls)
htmls.map { |e| Utils.escape_html(e) }
end
end
# The root of the directory hierarchy. Only requests for files and
# directories inside of the root directory are supported.
attr_reader :root
# Set the root directory and application for serving files.
def initialize(root, app = nil)
@root = ::File.expand_path(root)
@app = app || Files.new(@root)
@head = Head.new(method(:get))
end
def call(env)
# strip body if this is a HEAD call
@head.call env
end
# Internals of request handling. Similar to call but does
# not remove body for HEAD requests.
def get(env)
script_name = env[SCRIPT_NAME]
path_info = Utils.unescape_path(env[PATH_INFO])
if client_error_response = check_bad_request(path_info) || check_forbidden(path_info)
client_error_response
else
path = ::File.join(@root, path_info)
list_path(env, path, path_info, script_name)
end
end
# Rack response to use for requests with invalid paths, or nil if path is valid.
def check_bad_request(path_info)
return if Utils.valid_path?(path_info)
body = "Bad Request\n"
[400, { CONTENT_TYPE => "text/plain",
CONTENT_LENGTH => body.bytesize.to_s,
"x-cascade" => "pass" }, [body]]
end
# Rack response to use for requests with paths outside the root, or nil if path is inside the root.
def check_forbidden(path_info)
return unless path_info.include? ".."
return if ::File.expand_path(::File.join(@root, path_info)).start_with?(@root)
body = "Forbidden\n"
[403, { CONTENT_TYPE => "text/plain",
CONTENT_LENGTH => body.bytesize.to_s,
"x-cascade" => "pass" }, [body]]
end
# Rack response to use for directories under the root.
def list_directory(path_info, path, script_name)
url_head = (script_name.split('/') + path_info.split('/')).map do |part|
Utils.escape_path part
end
# Globbing not safe as path could contain glob metacharacters
body = DirectoryBody.new(@root, path, ->(basename) do
stat = stat(::File.join(path, basename))
next unless stat
url = ::File.join(*url_head + [Utils.escape_path(basename)])
mtime = stat.mtime.httpdate
if stat.directory?
type = 'directory'
size = '-'
url << '/'
if basename == '..'
basename = 'Parent Directory'
else
basename << '/'
end
else
type = Mime.mime_type(::File.extname(basename))
size = filesize_format(stat.size)
end
[ url, basename, size, type, mtime ]
end)
[ 200, { CONTENT_TYPE => 'text/html; charset=utf-8' }, body ]
end
# File::Stat for the given path, but return nil for missing/bad entries.
def stat(path)
::File.stat(path)
rescue Errno::ENOENT, Errno::ELOOP
return nil
end
# Rack response to use for files and directories under the root.
# Unreadable and non-file, non-directory entries will get a 404 response.
def list_path(env, path, path_info, script_name)
if (stat = stat(path)) && stat.readable?
return @app.call(env) if stat.file?
return list_directory(path_info, path, script_name) if stat.directory?
end
entity_not_found(path_info)
end
# Rack response to use for unreadable and non-file, non-directory entries.
def entity_not_found(path_info)
body = "Entity not found: #{path_info}\n"
[404, { CONTENT_TYPE => "text/plain",
CONTENT_LENGTH => body.bytesize.to_s,
"x-cascade" => "pass" }, [body]]
end
# Stolen from Ramaze
FILESIZE_FORMAT = [
['%.1fT', 1 << 40],
['%.1fG', 1 << 30],
['%.1fM', 1 << 20],
['%.1fK', 1 << 10],
]
# Provide human readable file sizes
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