* luci/libs: uvl: add support for external validation commands, various cleanups

libs/uvl/luasrc/uvl.lua

@@ -21,15 +21,16 @@ require("luci.util")
 require("luci.model.uci")
 require("luci.uvl.loghelper")
 require("luci.uvl.datatypes")
---require("luci.uvl.validation")
+require("luci.uvl.validation")
 require("luci.uvl.dependencies")
 
 TYPE_SECTION  = 0x01
 TYPE_VARIABLE = 0x02
 TYPE_ENUM     = 0x03
 
-STRICT_UNKNOWN_SECTIONS = true
-STRICT_UNKNOWN_OPTIONS  = true
+STRICT_UNKNOWN_SECTIONS    = true
+STRICT_UNKNOWN_OPTIONS     = true
+STRICT_EXTERNAL_VALIDATORS = true
 
 
 local default_schemedir = "/etc/scheme"
@@ -242,6 +243,11 @@ function UVL._validate_option( self, option, nodeps )
 		if not nodeps then
 			return luci.uvl.dependencies.check( self, option )
 		end
+
+		local ok, err = luci.uvl.validation.check( self, option )
+		if not ok and STRICT_EXTERNAL_VALIDATORS then
+			return false, self.log.validator_error( option, err )
+		end
 	end
 
 	return true, nil
@@ -353,6 +359,10 @@ function UVL._read_scheme_parts( self, scheme, schemes )
 						end
 					end
 				end
+
+				s.dynamic  = s.dynamic  or false
+				s.unique   = s.unique   or false
+				s.required = s.required or false
 			end
 		end
 	end
@@ -402,6 +412,7 @@ function UVL._read_scheme_parts( self, scheme, schemes )
 				end
 
 				t.type     = t.type     or "variable"
+				t.datatype = t.datatype or "string"
 				t.required = t.required or false
 			end
 		end
@@ -485,22 +496,24 @@ end
 
 -- Read a validator specification
 function UVL._read_validator( self, value, validators )
-	local validator
+	if value then
+		local validator
 
-	if value and value:match("/") and self.datatypes.file(value) then
-		validator = value
-	else
-		validator = self:_resolve_function( value )
-	end
-
-	if validator then
-		if not validators then
-			validators = { validator }
-		else
-			table.insert( validators, validator )
+		if value:match("^exec:") then
+			validator = value:gsub("^exec:","")
+		elseif value:match("^lua:") then
+			validator = self:_resolve_function( (value:gsub("^lua:","") ) )
 		end
 
-		return validators
+		if validator then
+			if not validators then
+				validators = { validator }
+			else
+				table.insert( validators, validator )
+			end
+
+			return validators
+		end
 	end
 end
 

libs/uvl/luasrc/uvl/dependencies.lua

@@ -16,15 +16,6 @@ $Id$
 
 module( "luci.uvl.dependencies", package.seeall )
 
-local function _assert( condition, fmt, ... )
-	if not condition then
-		return assert( nil, string.format( fmt, ... ) )
-	else
-		return condition
-	end
-end
-
-
 function _parse_reference( r, c, s, o )
 	local ref  = { }
 	local vars = {

libs/uvl/luasrc/uvl/loghelper.lua

@@ -30,6 +30,13 @@ function section_error( section, message )
 	)
 end
 
+function validator_error( option, message )
+	return string.format(
+		'External validator in option "%s" failed:\n%s',
+			option:cid(), message or "Unknown error"
+	)
+end
+
 function dump_dependency( dep, ref, v, e )
 	local str = nil
 
@@ -46,7 +53,7 @@ function dump_dependency( dep, ref, v, e )
 
 	str = string.format(
 		'%s) failed:\n\t%s',
-		str, e or string.format(
+		str, e and e:gsub("\n","\n\t") or string.format(
 			'Option "%s" %s',
 			table.concat( ref, "." ), (
 				type(v) == "boolean"

libs/uvl/luasrc/uvl/validation.lua

@@ -0,0 +1,65 @@
+--[[
+
+UCI Validation Layer - Validation helper
+(c) 2008 Jo-Philipp Wich <xm@leipzig.freifunk.net>
+(c) 2008 Steven Barth <steven@midlink.org>
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+$Id$
+
+]]--
+
+module( "luci.uvl.validation", package.seeall )
+
+require("luci.fs")
+require("luci.sys")
+
+
+function _exec( bin, args )
+	local cmd, output = "", nil
+
+	for _, v in ipairs({ bin, unpack(args) }) do
+		cmd = cmd .. string.format("%q ",v):gsub("([%$`])","\\%1")
+	end
+
+	local tmpfile = "/tmp/uvl" .. luci.sys.uniqueid(8)
+	local retval  = os.execute( cmd .. " 1>" .. tmpfile .. " 2>" .. tmpfile )
+
+	if luci.fs.access(tmpfile) then
+		output = luci.fs.readfile(tmpfile)
+		luci.fs.unlink(tmpfile)
+	end
+
+	return retval, output
+end
+
+function check( self, object )
+	local item = object:option()
+
+	if item.validators then
+		for _, val in ipairs(item.validators) do
+			local ok, err = false, nil
+			local args = {
+				item.type, unpack(object.cref), item.datatype, object:value()
+			}
+
+			if type(val) == "function" then
+				ok, err = val(unpack(args))
+			else
+				ok, err = _exec( val, args )
+				ok = ( ok == 0 )
+			end
+
+			if not ok then
+				return false, err
+			end
+		end
+	end
+
+	return true, nil
+end