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require 'zlib'
require 'rack/request'
require 'rack/response'
require 'rack/utils'
require 'time'
require 'grack/git'
module Grack
class Server
attr_reader :git
SERVICES = [
["POST", 'service_rpc', "(.*?)/git-upload-pack$", 'upload-pack'],
["POST", 'service_rpc', "(.*?)/git-receive-pack$", 'receive-pack'],
["GET", 'get_info_refs', "(.*?)/info/refs$"],
["GET", 'get_text_file', "(.*?)/HEAD$"],
["GET", 'get_text_file', "(.*?)/objects/info/alternates$"],
["GET", 'get_text_file', "(.*?)/objects/info/http-alternates$"],
["GET", 'get_info_packs', "(.*?)/objects/info/packs$"],
["GET", 'get_text_file', "(.*?)/objects/info/[^/]*$"],
["GET", 'get_loose_object', "(.*?)/objects/[0-9a-f]{2}/[0-9a-f]{38}$"],
["GET", 'get_pack_file', "(.*?)/objects/pack/pack-[0-9a-f]{40}\\.pack$"],
["GET", 'get_idx_file', "(.*?)/objects/pack/pack-[0-9a-f]{40}\\.idx$"],
]
def initialize(config = false)
set_config(config)
end
def set_config(config)
@config = config || {}
end
def set_config_setting(key, value)
@config[key] = value
end
def call(env)
dup._call(env)
end
def _call(env)
@env = env
@req = Rack::Request.new(env)
cmd, path, @reqfile, @rpc = match_routing
return render_method_not_allowed if cmd == 'not_allowed'
return render_not_found unless cmd
@git = get_git(path)
return render_not_found unless git.valid_repo?
self.method(cmd).call
end
# ---------------------------------
# actual command handling functions
# ---------------------------------
# Uses chunked (streaming) transfer, otherwise response
# blocks to calculate Content-Length header
# http://en.wikipedia.org/wiki/Chunked_transfer_encoding
CRLF = "\r\n"
def service_rpc
return render_no_access unless has_access?(@rpc, true)
input = read_body
@res = Rack::Response.new
@res.status = 200
@res["Content-Type"] = "application/x-git-%s-result" % @rpc
@res["Transfer-Encoding"] = "chunked"
@res["Cache-Control"] = "no-cache"
@res.finish do
git.execute([@rpc, '--stateless-rpc', git.repo]) do |pipe|
pipe.write(input)
pipe.close_write
while block = pipe.read(8192) # 8KB at a time
@res.write encode_chunk(block) # stream it to the client
end
@res.write terminating_chunk
end
end
end
def encode_chunk(chunk)
size_in_hex = chunk.size.to_s(16)
[size_in_hex, CRLF, chunk, CRLF].join
end
def terminating_chunk
[0, CRLF, CRLF].join
end
def get_info_refs
service_name = get_service_type
return dumb_info_refs unless has_access?(service_name)
refs = git.execute([service_name, '--stateless-rpc', '--advertise-refs', git.repo])
@res = Rack::Response.new
@res.status = 200
@res["Content-Type"] = "application/x-git-%s-advertisement" % service_name
hdr_nocache
@res.write(pkt_write("# service=git-#{service_name}\n"))
@res.write(pkt_flush)
@res.write(refs)
@res.finish
end
def dumb_info_refs
git.update_server_info
send_file(@reqfile, "text/plain; charset=utf-8") do
hdr_nocache
end
end
def get_info_packs
# objects/info/packs
send_file(@reqfile, "text/plain; charset=utf-8") do
hdr_nocache
end
end
def get_loose_object
send_file(@reqfile, "application/x-git-loose-object") do
hdr_cache_forever
end
end
def get_pack_file
send_file(@reqfile, "application/x-git-packed-objects") do
hdr_cache_forever
end
end
def get_idx_file
send_file(@reqfile, "application/x-git-packed-objects-toc") do
hdr_cache_forever
end
end
def get_text_file
send_file(@reqfile, "text/plain") do
hdr_nocache
end
end
# ------------------------
# logic helping functions
# ------------------------
# some of this borrowed from the Rack::File implementation
def send_file(reqfile, content_type)
reqfile = File.join(git.repo, reqfile)
return render_not_found unless File.exists?(reqfile)
return render_not_found unless reqfile == File.realpath(reqfile)
# reqfile looks legit: no path traversal, no leading '|'
@res = Rack::Response.new
@res.status = 200
@res["Content-Type"] = content_type
@res["Last-Modified"] = File.mtime(reqfile).httpdate
yield
if size = File.size?(reqfile)
@res["Content-Length"] = size.to_s
@res.finish do
File.open(reqfile, "rb") do |file|
while part = file.read(8192)
@res.write part
end
end
end
else
body = [File.read(reqfile)]
size = Rack::Utils.bytesize(body.first)
@res["Content-Length"] = size
@res.write body
@res.finish
end
end
def get_git(path)
root = @config[:project_root] || Dir.pwd
path = File.join(root, path)
Grack::Git.new(@config[:git_path], path)
end
def get_service_type
service_type = @req.params['service']
return false unless service_type
return false if service_type[0, 4] != 'git-'
service_type.gsub('git-', '')
end
def match_routing
cmd = nil
path = nil
SERVICES.each do |method, handler, match, rpc|
next unless m = Regexp.new(match).match(@req.path_info)
return ['not_allowed'] unless method == @req.request_method
cmd = handler
path = m[1]
file = @req.path_info.sub(path + '/', '')
return [cmd, path, file, rpc]
end
nil
end
def has_access?(rpc, check_content_type = false)
if check_content_type
conten_type = "application/x-git-%s-request" % rpc
return false unless @req.content_type == conten_type
end
return false unless ['upload-pack', 'receive-pack'].include?(rpc)
if rpc == 'receive-pack'
return @config[:receive_pack] if @config.include?(:receive_pack)
end
if rpc == 'upload-pack'
return @config[:upload_pack] if @config.include?(:upload_pack)
end
git.config_setting(rpc)
end
def read_body
if @env["HTTP_CONTENT_ENCODING"] =~ /gzip/
Zlib::GzipReader.new(@req.body).read
else
@req.body.read
end
end
# --------------------------------------
# HTTP error response handling functions
# --------------------------------------
PLAIN_TYPE = { "Content-Type" => "text/plain" }
def render_method_not_allowed
if @env['SERVER_PROTOCOL'] == "HTTP/1.1"
[405, PLAIN_TYPE, ["Method Not Allowed"]]
else
[400, PLAIN_TYPE, ["Bad Request"]]
end
end
def render_not_found
[404, PLAIN_TYPE, ["Not Found"]]
end
def render_no_access
[403, PLAIN_TYPE, ["Forbidden"]]
end
# ------------------------------
# packet-line handling functions
# ------------------------------
def pkt_flush
'0000'
end
def pkt_write(str)
(str.size + 4).to_s(16).rjust(4, '0') + str
end
# ------------------------
# header writing functions
# ------------------------
def hdr_nocache
@res["Expires"] = "Fri, 01 Jan 1980 00:00:00 GMT"
@res["Pragma"] = "no-cache"
@res["Cache-Control"] = "no-cache, max-age=0, must-revalidate"
end
def hdr_cache_forever
now = Time.now().to_i
@res["Date"] = now.to_s
@res["Expires"] = (now + 31536000).to_s;
@res["Cache-Control"] = "public, max-age=31536000";
end
end
end
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