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Mini Shell
#
# filehandler.rb -- FileHandler Module
#
# Author: IPR -- Internet Programming with Ruby -- writers
# Copyright (c) 2001 TAKAHASHI Masayoshi, GOTOU Yuuzou
# Copyright (c) 2003 Internet Programming with Ruby writers. All rights
# reserved.
#
# $IPR: filehandler.rb,v 1.44 2003/06/07 01:34:51 gotoyuzo Exp $
require 'thread'
require 'time'
require 'webrick/htmlutils'
require 'webrick/httputils'
require 'webrick/httpstatus'
module WEBrick
module HTTPServlet
class DefaultFileHandler < AbstractServlet
def initialize(server, local_path)
super
@local_path = local_path
end
def do_GET(req, res)
st = File::stat(@local_path)
mtime = st.mtime
res['etag'] = sprintf("%x-%x-%x", st.ino, st.size, st.mtime.to_i)
if not_modified?(req, res, mtime, res['etag'])
res.body = ''
raise HTTPStatus::NotModified
elsif req['range']
make_partial_content(req, res, @local_path, st.size)
raise HTTPStatus::PartialContent
else
mtype = HTTPUtils::mime_type(@local_path, @config[:MimeTypes])
res['content-type'] = mtype
res['content-length'] = st.size
res['last-modified'] = mtime.httpdate
res.body = open(@local_path, "rb")
end
end
def not_modified?(req, res, mtime, etag)
if ir = req['if-range']
begin
if Time.httpdate(ir) >= mtime
return true
end
rescue
if HTTPUtils::split_header_value(ir).member?(res['etag'])
return true
end
end
end
if (ims = req['if-modified-since']) && Time.parse(ims) >= mtime
return true
end
if (inm = req['if-none-match']) &&
HTTPUtils::split_header_value(inm).member?(res['etag'])
return true
end
return false
end
def make_partial_content(req, res, filename, filesize)
mtype = HTTPUtils::mime_type(filename, @config[:MimeTypes])
unless ranges = HTTPUtils::parse_range_header(req['range'])
raise HTTPStatus::BadRequest,
"Unrecognized range-spec: \"#{req['range']}\""
end
open(filename, "rb"){|io|
if ranges.size > 1
time = Time.now
boundary = "#{time.sec}_#{time.usec}_#{Process::pid}"
body = ''
ranges.each{|range|
first, last = prepare_range(range, filesize)
next if first < 0
io.pos = first
content = io.read(last-first+1)
body << "--" << boundary << CRLF
body << "Content-Type: #{mtype}" << CRLF
body << "Content-Range: bytes #{first}-#{last}/#{filesize}" << CRLF
body << CRLF
body << content
body << CRLF
}
raise HTTPStatus::RequestRangeNotSatisfiable if body.empty?
body << "--" << boundary << "--" << CRLF
res["content-type"] = "multipart/byteranges; boundary=#{boundary}"
res.body = body
elsif range = ranges[0]
first, last = prepare_range(range, filesize)
raise HTTPStatus::RequestRangeNotSatisfiable if first < 0
if last == filesize - 1
content = io.dup
content.pos = first
else
io.pos = first
content = io.read(last-first+1)
end
res['content-type'] = mtype
res['content-range'] = "bytes #{first}-#{last}/#{filesize}"
res['content-length'] = last - first + 1
res.body = content
else
raise HTTPStatus::BadRequest
end
}
end
def prepare_range(range, filesize)
first = range.first < 0 ? filesize + range.first : range.first
return -1, -1 if first < 0 || first >= filesize
last = range.last < 0 ? filesize + range.last : range.last
last = filesize - 1 if last >= filesize
return first, last
end
end
class FileHandler < AbstractServlet
HandlerTable = Hash.new
def self.add_handler(suffix, handler)
HandlerTable[suffix] = handler
end
def self.remove_handler(suffix)
HandlerTable.delete(suffix)
end
def initialize(server, root, options={}, default=Config::FileHandler)
@config = server.config
@logger = @config[:Logger]
@root = File.expand_path(root)
if options == true || options == false
options = { :FancyIndexing => options }
end
@options = default.dup.update(options)
end
def service(req, res)
# if this class is mounted on "/" and /~username is requested.
# we're going to override path informations before invoking service.
if defined?(Etc) && @options[:UserDir] && req.script_name.empty?
if %r|^(/~([^/]+))| =~ req.path_info
script_name, user = $1, $2
path_info = $'
begin
passwd = Etc::getpwnam(user)
@root = File::join(passwd.dir, @options[:UserDir])
req.script_name = script_name
req.path_info = path_info
rescue
@logger.debug "#{self.class}#do_GET: getpwnam(#{user}) failed"
end
end
end
prevent_directory_traversal(req, res)
super(req, res)
end
def do_GET(req, res)
unless exec_handler(req, res)
set_dir_list(req, res)
end
end
def do_POST(req, res)
unless exec_handler(req, res)
raise HTTPStatus::NotFound, "`#{req.path}' not found."
end
end
def do_OPTIONS(req, res)
unless exec_handler(req, res)
super(req, res)
end
end
# ToDo
# RFC2518: HTTP Extensions for Distributed Authoring -- WEBDAV
#
# PROPFIND PROPPATCH MKCOL DELETE PUT COPY MOVE
# LOCK UNLOCK
# RFC3253: Versioning Extensions to WebDAV
# (Web Distributed Authoring and Versioning)
#
# VERSION-CONTROL REPORT CHECKOUT CHECK_IN UNCHECKOUT
# MKWORKSPACE UPDATE LABEL MERGE ACTIVITY
private
def trailing_pathsep?(path)
# check for trailing path separator:
# File.dirname("/aaaa/bbbb/") #=> "/aaaa")
# File.dirname("/aaaa/bbbb/x") #=> "/aaaa/bbbb")
# File.dirname("/aaaa/bbbb") #=> "/aaaa")
# File.dirname("/aaaa/bbbbx") #=> "/aaaa")
return File.dirname(path) != File.dirname(path+"x")
end
def prevent_directory_traversal(req, res)
# Preventing directory traversal on Windows platforms;
# Backslashes (0x5c) in path_info are not interpreted as special
# character in URI notation. So the value of path_info should be
# normalize before accessing to the filesystem.
if trailing_pathsep?(req.path_info)
# File.expand_path removes the trailing path separator.
# Adding a character is a workaround to save it.
# File.expand_path("/aaa/") #=> "/aaa"
# File.expand_path("/aaa/" + "x") #=> "/aaa/x"
expanded = File.expand_path(req.path_info + "x")
expanded.chop! # remove trailing "x"
else
expanded = File.expand_path(req.path_info)
end
req.path_info = expanded
end
def exec_handler(req, res)
raise HTTPStatus::NotFound, "`#{req.path}' not found" unless @root
if set_filename(req, res)
handler = get_handler(req, res)
call_callback(:HandlerCallback, req, res)
h = handler.get_instance(@config, res.filename)
h.service(req, res)
return true
end
call_callback(:HandlerCallback, req, res)
return false
end
def get_handler(req, res)
suffix1 = (/\.(\w+)\z/ =~ res.filename) && $1.downcase
if /\.(\w+)\.([\w\-]+)\z/ =~ res.filename
if @options[:AcceptableLanguages].include?($2.downcase)
suffix2 = $1.downcase
end
end
handler_table = @options[:HandlerTable]
return handler_table[suffix1] || handler_table[suffix2] ||
HandlerTable[suffix1] || HandlerTable[suffix2] ||
DefaultFileHandler
end
def set_filename(req, res)
res.filename = @root.dup
path_info = req.path_info.scan(%r|/[^/]*|)
path_info.unshift("") # dummy for checking @root dir
while base = path_info.first
break if base == "/"
break unless File.directory?(File.expand_path(res.filename + base))
shift_path_info(req, res, path_info)
call_callback(:DirectoryCallback, req, res)
end
if base = path_info.first
if base == "/"
if file = search_index_file(req, res)
shift_path_info(req, res, path_info, file)
call_callback(:FileCallback, req, res)
return true
end
shift_path_info(req, res, path_info)
elsif file = search_file(req, res, base)
shift_path_info(req, res, path_info, file)
call_callback(:FileCallback, req, res)
return true
else
raise HTTPStatus::NotFound, "`#{req.path}' not found."
end
end
return false
end
def check_filename(req, res, name)
if nondisclosure_name?(name) || windows_ambiguous_name?(name)
@logger.warn("the request refers nondisclosure name `#{name}'.")
raise HTTPStatus::NotFound, "`#{req.path}' not found."
end
end
def shift_path_info(req, res, path_info, base=nil)
tmp = path_info.shift
base = base || tmp
req.path_info = path_info.join
req.script_name << base
res.filename = File.expand_path(res.filename + base)
check_filename(req, res, File.basename(res.filename))
end
def search_index_file(req, res)
@config[:DirectoryIndex].each{|index|
if file = search_file(req, res, "/"+index)
return file
end
}
return nil
end
def search_file(req, res, basename)
langs = @options[:AcceptableLanguages]
path = res.filename + basename
if File.file?(path)
return basename
elsif langs.size > 0
req.accept_language.each{|lang|
path_with_lang = path + ".#{lang}"
if langs.member?(lang) && File.file?(path_with_lang)
return basename + ".#{lang}"
end
}
(langs - req.accept_language).each{|lang|
path_with_lang = path + ".#{lang}"
if File.file?(path_with_lang)
return basename + ".#{lang}"
end
}
end
return nil
end
def call_callback(callback_name, req, res)
if cb = @options[callback_name]
cb.call(req, res)
end
end
def windows_ambiguous_name?(name)
return true if /[. ]+\z/ =~ name
return true if /::\$DATA\z/ =~ name
return false
end
def nondisclosure_name?(name)
@options[:NondisclosureName].each{|pattern|
if File.fnmatch(pattern, name, File::FNM_CASEFOLD)
return true
end
}
return false
end
def set_dir_list(req, res)
redirect_to_directory_uri(req, res)
unless @options[:FancyIndexing]
raise HTTPStatus::Forbidden, "no access permission to `#{req.path}'"
end
local_path = res.filename
list = Dir::entries(local_path).collect{|name|
next if name == "." || name == ".."
next if nondisclosure_name?(name)
next if windows_ambiguous_name?(name)
st = (File::stat(File.join(local_path, name)) rescue nil)
if st.nil?
[ name, nil, -1 ]
elsif st.directory?
[ name + "/", st.mtime, -1 ]
else
[ name, st.mtime, st.size ]
end
}
list.compact!
if d0 = req.query["N"]; idx = 0
elsif d0 = req.query["M"]; idx = 1
elsif d0 = req.query["S"]; idx = 2
else d0 = "A" ; idx = 0
end
d1 = (d0 == "A") ? "D" : "A"
if d0 == "A"
list.sort!{|a,b| a[idx] <=> b[idx] }
else
list.sort!{|a,b| b[idx] <=> a[idx] }
end
res['content-type'] = "text/html"
res.body = <<-_end_of_html_
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
<HTML>
<HEAD><TITLE>Index of #{HTMLUtils::escape(req.path)}</TITLE></HEAD>
<BODY>
<H1>Index of #{HTMLUtils::escape(req.path)}</H1>
_end_of_html_
res.body << "<PRE>\n"
res.body << " <A HREF=\"?N=#{d1}\">Name</A> "
res.body << "<A HREF=\"?M=#{d1}\">Last modified</A> "
res.body << "<A HREF=\"?S=#{d1}\">Size</A>\n"
res.body << "<HR>\n"
list.unshift [ "..", File::mtime(local_path+"/.."), -1 ]
list.each{ |name, time, size|
if name == ".."
dname = "Parent Directory"
elsif name.size > 25
dname = name.sub(/^(.{23})(.*)/){ $1 + ".." }
else
dname = name
end
s = " <A HREF=\"#{HTTPUtils::escape(name)}\">#{dname}</A>"
s << " " * (30 - dname.size)
s << (time ? time.strftime("%Y/%m/%d %H:%M ") : " " * 22)
s << (size >= 0 ? size.to_s : "-") << "\n"
res.body << s
}
res.body << "</PRE><HR>"
res.body << <<-_end_of_html_
<ADDRESS>
#{HTMLUtils::escape(@config[:ServerSoftware])}<BR>
at #{req.host}:#{req.port}
</ADDRESS>
</BODY>
</HTML>
_end_of_html_
end
end
end
end
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