1package graphql2
 2
 3import (
 4	"encoding/base64"
 5	"strings"
 6)
 7
 8
 9type ResolvedGlobalID struct {
10	Type string `json:"type"`
11	ID   string `json:"id"`
12}
13
14// Takes a type name and an ID specific to that type name, and returns a
15// "global ID" that is unique among all types.
16func ToGlobalID(ttype string, id string) string {
17	str := ttype + ":" + id
18	encStr := base64.StdEncoding.EncodeToString([]byte(str))
19	return encStr
20}
21
22// Takes the "global ID" created by toGlobalID, and returns the type name and ID
23// used to create it.
24func FromGlobalID(globalID string) *ResolvedGlobalID {
25	strID := ""
26	b, err := base64.StdEncoding.DecodeString(globalID)
27	if err == nil {
28		strID = string(b)
29	}
30	tokens := strings.Split(strID, ":")
31	if len(tokens) < 2 {
32		return nil
33	}
34	return &ResolvedGlobalID{
35		Type: tokens[0],
36		ID:   tokens[1],
37	}
38}
39