moving a bunch of packages under pkg (#124)

* moving a bunch of packages under pkg

* fix gen

* fix tst

* oops

* fix test fo real

* parse mx/a

pkg/js/js.go

@@ -0,0 +1,64 @@
+package js
+
+import (
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+
+	"github.com/StackExchange/dnscontrol/models"
+
+	"github.com/robertkrimen/otto"
+	//load underscore js into vm by default
+	_ "github.com/robertkrimen/otto/underscore"
+)
+
+//ExecuteJavascript accepts a javascript string and runs it, returning the resulting dnsConfig.
+func ExecuteJavascript(script string, devMode bool) (*models.DNSConfig, error) {
+	vm := otto.New()
+
+	vm.Set("require", require)
+
+	helperJs := GetHelpers(devMode)
+	// run helper script to prime vm and initialize variables
+	if _, err := vm.Run(helperJs); err != nil {
+		return nil, err
+	}
+
+	// run user script
+	if _, err := vm.Run(script); err != nil {
+		return nil, err
+	}
+
+	// export conf as string and unmarshal
+	value, err := vm.Run(`JSON.stringify(conf)`)
+	if err != nil {
+		return nil, err
+	}
+	str, err := value.ToString()
+	if err != nil {
+		return nil, err
+	}
+	conf := &models.DNSConfig{}
+	if err = json.Unmarshal([]byte(str), conf); err != nil {
+		return nil, err
+	}
+	return conf, nil
+}
+
+func GetHelpers(devMode bool) string {
+	return _escFSMustString(devMode, "/helpers.js")
+}
+
+func require(call otto.FunctionCall) otto.Value {
+	file := call.Argument(0).String()
+	fmt.Printf("requiring: %s\n", file)
+	data, err := ioutil.ReadFile(file)
+	if err != nil {
+		panic(err)
+	}
+	_, err = call.Otto.Run(string(data))
+	if err != nil {
+		panic(err)
+	}
+	return otto.TrueValue()
+}