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cgi = {}
cgi.none = "None"
cgi.lax = "Lax"
cgi.strict = "Strict"
-- global helpers
function string.split(self, sep)
if not sep then sep = "%s" end
local t = {}
for match in (self .. sep):gmatch("(.-)" .. sep) do
table.insert(t, match)
end
return t
end
function string.fromhex(self)
return (self:gsub("..", function(cc)
return string.char(tonumber(cc, 16))
end))
end
function string.tohex(self)
return (self:gsub(".", function(c)
return string.format("%02x", string.byte(c))
end))
end
function cgi.encode_uri(str)
if str then
str = str:gsub("\n", "\r\n")
str = str:gsub("([^%w _ %- . ~])",
function(c) return string.format("%%%02X", string.byte(c)) end)
str = str:gsub(" ", "+")
end
return str
end
function cgi.decode_uri(str)
if str then
str = str:gsub("+", " ")
str = str:gsub("%%(%x%x)",
function(hex) return string.char(tonumber(hex, 16)) end)
end
return str
end
local function parse_params(dst, src)
for _, pair in ipairs(src:split("&")) do
local kv = pair:split("=")
local key = kv[1]
local value = kv[2]
dst[key] = cgi.decode_uri(value)
end
end
local function params_tostring(src)
local dst = ""
for k, v in pairs(src) do
local kv = k .. "=" .. cgi.encode_uri(v)
dst = dst .. kv .. "&"
end
return dst:sub(1, #dst - 1)
end
local function parse_cookies(dst, src)
for _, pair in ipairs(src:split("; ")) do
local kv = pair:split("=")
local key = kv[1]
local value = kv[2]
dst[key] = cgi.decode_uri(value)
end
end
-- method
cgi.method = os.getenv("REQUEST_METHOD")
-- GET/POST params
cgi.get = {}
cgi.post = {}
if cgi.method == "GET" then
local get_params = os.getenv("QUERY_STRING")
if get_params then
parse_params(cgi.get, get_params)
end
elseif cgi.method == "POST" then
local post_params = io.read("*a")
if post_params then
parse_params(cgi.post, post_params)
end
end
-- cookies
local cookies = {}
local cookie = os.getenv("HTTP_COOKIE")
if cookie then
local c = {}
parse_cookies(c, cookie)
for k, v in pairs(c) do
cookies[k] = {value = v}
end
end
function cgi.get_cookie(name)
if not cookies[name] then return nil end
return cookies[name].value
end
function cgi.set_cookie(name, cookie)
cookie._modified = true
cookies[name] = cookie
end
-- custom headers
function cgi.request_header(name)
return os.getenv("HTTP_" .. name:upper())
end
local resp_headers = {}
local headers_complete = false
function cgi.header(key, value)
if not value then
return false
end
if not headers_complete then
resp_headers[key] = value
print(key .. ": " .. value)
end
return not headers_complete
end
-- set cookies on exit
local function set_cookies()
for name, c in pairs(cookies) do
if c._modified then
local cookie = name .. "=" .. cgi.encode_uri(c.value or "")
if c.domain then
cookie = cookie .. "; Domain=" .. c.domain
end
if c.path then
cookie = cookie .. "; Path=" .. c.path
end
if c.expires then
cookie = cookie .. "; Expires=" .. c.expires
end
if c.http_only then
cookie = cookie .. "; HttpOnly"
end
if c.https_only then
cookie = cookie .. "; Secure"
end
if c.same_site then
cookie = cookie .. "; SameSite=" .. c.same_site
end
cgi.header("Set-Cookie", cookie)
end
end
end
-- special date format
function cgi.date(t)
return os.date("!%a, %d %b %Y %H:%M:%S GMT", t)
end
-- (custom) content
function cgi.content(data)
if not headers_complete then
set_cookies()
print()
headers_complete = true
end
if data then
print(data)
end
return not not data
end
function cgi.serve(data)
if data then
cgi.content(data)
else
cgi.status(500)
end
cgi.done()
end
-- finish response
function cgi.done()
if not headers_complete then
local body
local status = tonumber(resp_headers["Status"])
if status and status >= 400 and status < 600 then
-- error but no content: display error page
local f = io.open("/var/www/html/error/" .. tostring(status) .. ".html")
if f then
body = f:read("*a")
f:close()
end
end
cgi.content(body)
end
os.exit(0)
end
-- frequently used header utilities
function cgi.content_type(type)
return cgi.header("Content-Type", type)
end
function cgi.status(code)
return cgi.header("Status", tostring(code))
end
return cgi
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