-- @@SHEBANG
-- -*- Lua -*-
-- command cgi
--
-- Git (with) Augmented network operations -- User authentication wrapper
--
-- Copyright 2014-2017 Richard Ipsum <richard.ipsum@codethink.co.uk>
-- All rights reserved.
--
-- Redistribution and use in source and binary forms, with or without
-- modification, are permitted provided that the following conditions
-- are met:
-- 1. Redistributions of source code must retain the above copyright
--    notice, this list of conditions and the following disclaimer.
-- 2. Redistributions in binary form must reproduce the above copyright
--    notice, this list of conditions and the following disclaimer in the
--    documentation and/or other materials provided with the distribution.
-- 3. Neither the name of the author nor the names of their contributors
--    may be used to endorse or promote products derived from this software
--    without specific prior written permission.
--
-- THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-- ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-- IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-- ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-- FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-- DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-- OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-- HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-- LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-- OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-- SUCH DAMAGE.
--
--

-- @@GITANO_LUA_PATH

local gitano = require "gitano"
local gall = require "gall"
local luxio = require "luxio"
local sio = require "luxio.simple"

-- @@GITANO_BIN_PATH
-- @@GITANO_SHARE_PATH
-- @@GITANO_I18N_PATH
-- @@GITANO_PLUGIN_PATH

local stdout = sio.stdout

function url_decode(str)
   str = string.gsub(str, "+", " ")
   str = string.gsub(str, "%%(%x%x)",
                     function(h) return string.char(tonumber(h,16)) end)
   str = string.gsub(str, "\r\n", "\n")
   return str
end

if os.getenv("QUERY_STRING") then
   local query_string = url_decode(os.getenv("QUERY_STRING"))
   local cmdline = query_string

   local _, e = string.find(query_string, "cmd=")

   if not e then
      stdout:write("Status: 400 Bad request\r\n\r\n")
      stdout:write("FATAL: " .. gitano.i18n.expand("ERROR_NO_COMMAND") .. "\n")
      return
   end

   cmdline = string.sub(query_string, e + 1, #query_string)

   if cmdline == '' then
      stdout:write("Status: 400 Bad request\r\n\r\n")
      stdout:write("FATAL: " .. gitano.i18n.expand("ERROR_NO_COMMAND") .. "\n")
      return
   end

   local user = os.getenv("REMOTE_USER") or "gitano/anonymous"

   gitano.log.buffer_output()
   local start_log_level = gitano.log.get_level()
   gitano.log.cap_level(gitano.log.level.INFO)
   local transactionid = gitano.log.syslog.open()

   local authorized, cmd, parsed_cmdline, config, env, repo =
      gitano.auth.is_authorized(user, "http", cmdline, os.getenv("GITANO_ROOT"),
                                transactionid, start_log_level)

   if authorized then
      local exit = gitano.util.run_command(cmd, cmdline, parsed_cmdline,
                                           user, config, env, repo)

      stdout:write("Status: " .. (exit == 0 and "200 OK" or "400 Bad request")
                      .. "\r\n\r\n")
      stdout:write(gitano.log.get_buffered_output() or "")
   else
      stdout:write("Status: 403 Forbidden\r\n\r\n")
      stdout:write(gitano.log.get_buffered_output() or "")
      stdout:write("FATAL: " .. gitano.i18n.expand("ERROR_NOT_AUTHORISED") .. "\n")

   end

   gitano.log.syslog.close()
else
   stdout:write("Status: 400 Bad request\r\n\r\n")
   stdout:write("FATAL: " .. gitano.i18n.expand("ERROR_NO_COMMAND") .. "\n")
end
