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-- lib/lace/builtin.lua
--
-- Lua Access Control Engine -- Builtin commands for Lace
--
-- Copyright 2012 Daniel Silverstone <dsilvers@digital-scurf.org>
--
-- For Licence terms, see COPYING
--
local builtin = {}
local function compiler()
return require "lace.compiler"
end
--[ Allow and Deny ]------------------------------------------------
local unconditional_result = nil
local last_result = nil
local function get_set_last_unconditional_result(newv)
local ret = unconditional_result
unconditional_result = newv
return ret
end
local function get_set_last_result(newv)
local ret = last_result
last_result = newv
return ret
end
local function _do_return(exec_context, result, reason, cond)
if #cond > 0 then
-- Run the conditions
end
return result, reason
end
local function _return(compcontext, result, reason, ...)
if result ~= "allow" and result ~= "deny" then
return compiler().error("Unknown result: " .. result, {1})
end
if type(reason) ~= "string" then
return compiler().error("Expected reason, got nothing")
end
local cond = {...}
if #cond == 0 then
unconditional_result = result
end
last_result = result
return {
fn = _do_return,
args = { result, reason, cond }
}
end
builtin.allow = _return
builtin.deny = _return
--[ Default for Allow and Deny ]------------------------------------
function builtin.default(compcontext, def, result, reason, unwanted)
assert(def == "default", "Somehow, builtin.default got something odd")
if type(result) ~= "string" then
return compiler().error("Expected result, got nothing")
end
if result ~= "allow" and result ~= "deny" then
return compiler().error("Result wasn't allow or deny", {2})
end
if type(reason) ~= "string" then
reason = "Default behaviour"
end
if unwanted ~= nil then
return compiler().error("Unexpected additional content", {4})
end
if compcontext[".lace"].default then
return compiler().error("Cannot change the default")
end
compcontext[".lace"].default = _return(compcontext, result, reason)
return {
fn = function() return true end,
args = {}
}
end
return {
commands = builtin,
get_set_last_unconditional_result = get_set_last_unconditional_result,
get_set_last_result = get_set_last_result,
}
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