initial

go.mod

@@ -0,0 +1,3 @@
+module code.icod.de/dalu/oid64
+
+go 1.20

oid64.go

@@ -0,0 +1,24 @@
+package oid64
+
+import (
+	"encoding/base64"
+	"encoding/hex"
+)
+
+func ObjectIDToBase64(oid string) (string, error) {
+	b, e := hex.DecodeString(oid)
+	if e != nil {
+		return "", e
+	}
+	s := base64.URLEncoding.EncodeToString(b)
+	return s, nil
+}
+
+func Base64ToObjectID(bid string) (string, error) {
+	b, e := base64.URLEncoding.DecodeString(bid)
+	if e != nil {
+		return "", e
+	}
+	s := hex.EncodeToString(b)
+	return s, nil
+}

oid64_test.go

@@ -0,0 +1,31 @@
+package oid64
+
+import "testing"
+
+func TestObjectIDToBase64(t *testing.T) {
+	in := "507f191e810c19729de860ea"
+	exOut := "UH8ZHoEMGXKd6GDq"
+
+	out, e := ObjectIDToBase64(in)
+	if e != nil {
+		t.Fatal(e.Error())
+	}
+	if out != exOut {
+		t.Logf("Results don't match. Expected %s got %s", exOut, out)
+		t.Fail()
+	}
+}
+
+func TestBase64ToObjectID(t *testing.T) {
+	in := "UH8ZHoEMGXKd6GDq"
+	exOut := "507f191e810c19729de860ea"
+
+	out, e := Base64ToObjectID(in)
+	if e != nil {
+		t.Fatal(e.Error())
+	}
+	if out != exOut {
+		t.Logf("Results don't match. Expected %s got %s", exOut, out)
+		t.Fail()
+	}
+}