💾 Archived View for gemini.conman.org › extensions › GLV-1 › handlers › gRFC.lua captured on 2021-12-17 at 13:26:06.
⬅️ Previous capture (2021-12-03)
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-- ************************************************************************
--
-- CGI interface.
-- Copyright 2019 by Sean Conner. All Rights Reserved.
--
-- This program is free software: you can redistribute it and/or modify
-- it under the terms of the GNU General Public License as published by
-- the Free Software Foundation, either version 3 of the License, or
-- (at your option) any later version.
--
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU General Public License for more details.
--
-- You should have received a copy of the GNU General Public License
-- along with this program. If not, see <http://www.gnu.org/licenses/>.
--
-- Comments, questions and criticisms can be sent to: sean@conman.org
--
-- ************************************************************************
-- luacheck: globals init fini handler
-- luacheck: ignore 611
-- RFC-3875
-- ************************************************************************
local abnf = require "org.conman.parsers.abnf"
local strftime = require "org.conman.parsers.strftime"
local fsys = require "org.conman.fsys"
local lpeg = require "lpeg"
local io = require "io"
local os = require "os"
local string = require "string"
local table = require "table"
_ENV = {}
-- ************************************************************************
local parse_headers, parse_body do
local Cf = lpeg.Cf
local Cg = lpeg.Cg
local Cs = lpeg.Cs
local Ct = lpeg.Ct
local C = lpeg.C
local P = lpeg.P
local R = lpeg.R
local S = lpeg.S
local H do
local text = R("AZ","az") / function(c) return P(c:lower()) + P(c:upper()) end
+ P(1) / function(c) return P(c) end
H = function(s)
local pattern = Cf(text^1,function(acc,pat) return acc * pat end)
return pattern:match(s) / s
end
end
local LWSP = (abnf.WSP + abnf.CRLF * abnf.WSP)
local text = LWSP^1 / " "
+ abnf.VCHAR
local separator = S'()<>@,;:\\"/[]?={}\t '
local token = (abnf.VCHAR - separator)^1
local subject = H"Subject" * P":" * LWSP * Cs(text^1) * abnf.CRLF
local from = H"From" * P":" * LWSP * Cs(text^1) * abnf.CRLF
local date = H"Date" * P":" * LWSP * strftime:match("%a, %e %b %Y") * abnf.CRLF
local content_type = H"Content-Type" * P":" * LWSP * Cs(text^1) * abnf.CRLF
local status = H"Status" * P":" * LWSP * Cs(text^1) * abnf.CRLF
local generic = C(token) * P":" * LWSP * C(text^0) * abnf.CRLF
local headers = subject + from + date + status + content_type + generic
parse_headers = Cf(Ct"" * Cg(headers)^1,function(acc,name,value)
acc[name] = value
return acc
end)
* abnf.CRLF
local line = C(R("\9\9"," ~")^0) * abnf.CRLF
parse_body = Ct(line^1)
end
-- ************************************************************************
function handler(conf,_,_,match,ios)
if match[1] == "" then
ios:write(
"20 text/gemini\r\n",
"Gemini Request For Comments\r\n",
"---------------------------\r\n",
"\r\n"
)
for file in fsys.gexpand(conf.directory .. "/[0-9][0-9][0-9][0-9]") do
local f = io.open(file,"r")
local headers = parse_headers:match(f:read("*a"))
f:close()
local name = fsys.basename(file)
local when = os.date("%Y-%m-%d",os.time(headers['Date']))
ios:write(string.format([[=> %s %s %s %-8s %s]],
name,
name,
when,
headers['Status'],
headers['Subject']
),"\r\n")
end
ios:write(
"\r\n",
"---------------------------\r\n",
"GLV-1.12556\r\n"
)
return 20
else
local f = io.open(conf.directory .. "/" .. match[1],"r")
if not f then
ios:write("51\r\n")
return 51
end
local d = f:read("*a")
local headers = parse_headers:match(d)
local reply = parse_body:match(d)
f:close()
ios:write(
"20 ",headers['Content-Type'],"\r\n",
table.concat(reply,"\r\n"),
"\r\n"
)
return 20
end
end
-- ************************************************************************
return _ENV