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local M = { _NAME = "uri.urn.oid" }
local Util = require "uri._util"
local URN = require "uri.urn"
Util.subclass_of(M, URN)
-- This implements RFC 3061.
local function _valid_oid (oid)
if oid == "" then return nil, "OID can't be zero-length" end
if not oid:find("^[.0-9]*$") then return nil, "bad character in OID" end
if oid:find("%.%.") then return nil, "missing number in OID" end
if oid:find("^0[^.]") or oid:find("%.0[^.]") then
return nil, "OID numbers shouldn't have leading zeros"
end
return true
end
function M.init (self)
local nss = self:nss()
local ok, msg = _valid_oid(nss)
if not ok then return nil, "bad NSS value for OID URI (" .. msg .. ")" end
return self
end
function M.nss (self, new)
local old = M._SUPER.nss(self)
if new then
local ok, msg = _valid_oid(new)
if not ok then
error("bad OID value '" .. new .. "' (" .. msg .. ")")
end
M._SUPER.nss(self, new)
end
return old
end
function M.oid_numbers (self, new)
local old = Util.split("%.", self:nss())
for i = 1, #old do old[i] = tonumber(old[i]) end
if new then
if type(new) ~= "table" then error("expected array of numbers") end
local nss = ""
for _, n in ipairs(new) do
if type(n) == "string" and n:find("^%d+$") then n = tonumber(n) end
if type(n) ~= "number" then error("bad type for number in OID") end
n = n - n % 1
if n < 0 then error("negative numbers not allowed in OID") end
if nss ~= "" then nss = nss .. "." end
nss = nss .. n
end
if nss == "" then error("no numbers in new OID value") end
self:nss(nss)
end
return old
end
return M
-- vi:ts=4 sw=4 expandtab
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