From 5dd11641656f3e6a848713b6f0e723efb7882fac Mon Sep 17 00:00:00 2001
From: Darko Luketic <info@icod.de>
Date: Thu, 3 Aug 2023 17:25:00 +0200
Subject: [PATCH] initial

---
 README.md     |  0
 go.mod        |  3 +++
 oid64.go      | 24 ++++++++++++++++++++++++
 oid64_test.go | 31 +++++++++++++++++++++++++++++++
 4 files changed, 58 insertions(+)
 create mode 100644 README.md
 create mode 100644 go.mod
 create mode 100644 oid64.go
 create mode 100644 oid64_test.go

diff --git a/README.md b/README.md
new file mode 100644
index 0000000..e69de29
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..28df167
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module code.icod.de/dalu/oid64
+
+go 1.20
diff --git a/oid64.go b/oid64.go
new file mode 100644
index 0000000..7bb7527
--- /dev/null
+++ b/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
+}
diff --git a/oid64_test.go b/oid64_test.go
new file mode 100644
index 0000000..b134585
--- /dev/null
+++ b/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()
+	}
+}