Add example and small CLI

Signed-off-by: jolheiser <john.olheiser@gmail.com>

cmd/confage/main.go

@@ -0,0 +1,23 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+
+	"go.jolheiser.com/confage"
+
+	
+)
+
+func main() {
+	fs := flag.NewFlagSet("confage", flag.ExitOnError)
+	secretKeyFlag := fs.String("secret-key", "", "Age secret key")
+	fs.StringVar(secretKeyFlag, "s", *secretKeyFlag, "--secret-key")
+	if err := fs.Parse(os.Args[1:]); err != nil {
+		panic(err)
+	}
+
+	t := confage.MustNew(*secretKeyFlag, fs.Arg(0))
+	fmt.Println(t.String())
+}

confage.go

@@ -38,8 +38,7 @@ func New[T any](key string, val T) (v Type[T], err error) {
 		if err != nil {
 			return v, err
 		}
-		i = ii
-		r = ii.Recipient()
+		i, r = ii, ii.Recipient()
 	default:
 		i, err = age.NewScryptIdentity(key)
 		if err != nil {
@@ -65,40 +64,47 @@ func (t Type[T]) String() string {
 }
 
 // MarshalText implements encoding.MarshalText
-func (v Type[T]) MarshalText() ([]byte, error) {
+func (t Type[T]) MarshalText() ([]byte, error) {
 	var b bytes.Buffer
-	w, err := age.Encrypt(&b, v.r)
+	w, err := age.Encrypt(&b, t.r)
 	if err != nil {
 		return nil, err
 	}
-	if err := json.NewEncoder(w).Encode(v.Value); err != nil {
+
+	if err := json.NewEncoder(w).Encode(t.Value); err != nil {
 		return nil, err
 	}
+
 	if err := w.Close(); err != nil {
 		return nil, err
 	}
+
 	out := base64.StdEncoding.EncodeToString(b.Bytes())
 	return []byte(out), nil
 }
 
 // UnmarshalText implements encoding.UnmarshalText
-func (v *Type[T]) UnmarshalText(text []byte) error {
+func (t *Type[T]) UnmarshalText(text []byte) error {
 	b, err := base64.StdEncoding.DecodeString(string(text))
 	if err != nil {
 		return err
 	}
-	r, err := age.Decrypt(bytes.NewBuffer(b), v.i)
+
+	r, err := age.Decrypt(bytes.NewBuffer(b), t.i)
 	if err != nil {
 		return err
 	}
+
 	var out bytes.Buffer
 	if _, err := io.Copy(&out, r); err != nil {
 		return err
 	}
+
 	var val T
 	if err := json.Unmarshal(out.Bytes(), &val); err != nil {
 		return err
 	}
-	(*v).Value = val
+
+	(*t).Value = val
 	return nil
 }

confage_example_test.go

@@ -0,0 +1,38 @@
+package confage_test
+
+import (
+	"encoding/json"
+	"fmt"
+
+	"go.jolheiser.com/confage"
+
+	
+)
+
+func Example_config() {
+	const secretKey = "AGE-SECRET-KEY-1AN83H8JECDKHSD2RN70WU8RQYYH3C309UUYQQ0EPQNJR3ZXRDHESTUCCM4" // age1ynmpzgvrqj3r6z39kp3p852afe3nkc3neem80vgq96jt2zhesezq8yhn02
+
+	cfg := &Config{
+		Password: confage.MustNew(secretKey, ""),
+	}
+
+	if err := json.Unmarshal(config, &cfg); err != nil {
+		panic(err)
+	}
+
+	fmt.Println(cfg.Password.Value)
+	// Output:
+	// bar
+}
+
+// Example config struct
+type Config struct {
+	Username string
+	Password confage.Type[string]
+}
+
+// config.json living on disk
+var config = []byte(`{
+	"username": "foo",
+	"password": "YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSB0b3pzdTVtcnBBUFV3bnNsa2RIYlhTVGVYeXlHcHpIbEpMR3ZwcWxHMmtjClc5ald4MHZhdFFKY3NmS0R5bFpXY1VGa1RKeWxHaGVzR3FhS1B1NHgydUkKLS0tIEJYRnhMNm12aE14bUU5bGNPVFBJcHBWZDJBeWFMMVdMUGdyVXErOVFuaWsK3F0DfPH+Ud50XIBoDR2D/+/PMoqNp9O2R6BdBLTLyiENJYrxGxo="
+}`)

confage_test.go

@@ -7,29 +7,82 @@ import (
 	"github.com/matryer/is"
 )
 
-func TestTypeScrypt(t *testing.T) {
-	assert := is.New(t)
+const (
+	passphrase = "passphrase"
+	secretKey  = "AGE-SECRET-KEY-1F7SU7MXLVHU0SWQ3L2ZMW7G2NN2YTH88NLU6LVDHENTZLMCT3M5S799RDK"
+)
 
-	enc := MustNew("passphrase", 0)
-	enc.Value = 100
+type Struct struct {
+	String string
+	Int    int
+	Bool   bool
+}
+
+func TestType(t *testing.T) {
+	t.Run("string", func(t *testing.T) {
+		assert := is.New(t)
+		val := "foo"
+		testEncryption(assert, passphrase, val)
+		testEncryption(assert, secretKey, val)
+	})
+
+	t.Run("int", func(t *testing.T) {
+		assert := is.New(t)
+		val := 123
+		testEncryption(assert, passphrase, val)
+		testEncryption(assert, secretKey, val)
+	})
+
+	t.Run("bool", func(t *testing.T) {
+		assert := is.New(t)
+		val := true
+		testEncryption(assert, passphrase, val)
+		testEncryption(assert, secretKey, val)
+	})
+
+	t.Run("map", func(t *testing.T) {
+		assert := is.New(t)
+		val := map[string]any{
+			"foo": "bar",
+			"baz": 123.0,
+			"bux": false,
+		}
+		testEncryption(assert, passphrase, val)
+		testEncryption(assert, secretKey, val)
+	})
+
+	t.Run("struct", func(t *testing.T) {
+		assert := is.New(t)
+		val := Struct{
+			String: "string",
+			Int:    123,
+			Bool:   true,
+		}
+		testEncryption(assert, passphrase, val)
+		testEncryption(assert, secretKey, val)
+	})
+
+	t.Run("pointer", func(t *testing.T) {
+		assert := is.New(t)
+		val := &Struct{
+			String: "string",
+			Int:    123,
+			Bool:   true,
+		}
+		testEncryption(assert, passphrase, val)
+		testEncryption(assert, secretKey, val)
+	})
+}
+
+func testEncryption[T any](assert *is.I, key string, value T) {
+	assert.Helper()
+
+	enc := MustNew(key, value)
 	payload, err := json.Marshal(enc)
 	assert.NoErr(err) // Should be able to marshal JSON
 
-	dec := MustNew("passphrase", 0)
-	err = json.Unmarshal(payload, &dec)
-	assert.NoErr(err) // Should be able to unmarshal JSON
-
-	assert.Equal(enc.Value, dec.Value) // Values should match
-}
-
-func TestTypeX25519(t *testing.T) {
-	assert := is.New(t)
-
-	enc := MustNew("AGE-SECRET-KEY-1F7SU7MXLVHU0SWQ3L2ZMW7G2NN2YTH88NLU6LVDHENTZLMCT3M5S799RDK", 100)
-	payload, err := json.Marshal(enc)
-	assert.NoErr(err) // Should be able to marshal JSON
-
-	dec := MustNew("AGE-SECRET-KEY-1F7SU7MXLVHU0SWQ3L2ZMW7G2NN2YTH88NLU6LVDHENTZLMCT3M5S799RDK", 0)
+	var t T
+	dec := MustNew(key, t)
 	err = json.Unmarshal(payload, &dec)
 	assert.NoErr(err) // Should be able to unmarshal JSON