feat: implement basic oidc functionality

internal/utils/security_utils.go

@@ -1,8 +1,11 @@
 package utils
 
 import (
+	"crypto/rand"
 	"encoding/base64"
 	"errors"
+	"math"
+	"math/big"
 	"net"
 	"regexp"
 	"strings"
@@ -105,3 +108,28 @@ func GenerateUUID(str string) string {
 	uuid := uuid.NewSHA1(uuid.NameSpaceURL, []byte(str))
 	return uuid.String()
 }
+
+// These could definitely be improved A LOT but at least they are cryptographically secure
+func GetRandomString(length int) (string, error) {
+	if length < 1 {
+		return "", errors.New("length must be greater than 0")
+	}
+	b := make([]byte, length)
+	_, err := rand.Read(b)
+	if err != nil {
+		return "", err
+	}
+	state := base64.RawURLEncoding.EncodeToString(b)
+	return state[:length], nil
+}
+
+func GetRandomInt(length int) (int64, error) {
+	if length < 1 {
+		return 0, errors.New("length must be greater than 0")
+	}
+	a, err := rand.Int(rand.Reader, big.NewInt(int64(math.Pow(10, float64(length)))))
+	if err != nil {
+		return 0, err
+	}
+	return a.Int64(), nil
+}

internal/utils/security_utils_test.go

@@ -2,6 +2,7 @@ package utils_test
 
 import (
 	"os"
+	"strconv"
 	"testing"
 
 	"github.com/steveiliop56/tinyauth/internal/utils"
@@ -147,3 +148,25 @@ func TestGenerateUUID(t *testing.T) {
 	id3 := utils.GenerateUUID("differentstring")
 	assert.Assert(t, id1 != id3)
 }
+
+func TestGetRandomString(t *testing.T) {
+	// Test with normal length
+	state, err := utils.GetRandomString(16)
+	assert.NilError(t, err)
+	assert.Equal(t, 16, len(state))
+
+	// Test with zero length
+	state, err = utils.GetRandomString(0)
+	assert.Error(t, err, "length must be greater than 0")
+}
+
+func TestGetRandomInt(t *testing.T) {
+	// Test with normal length
+	state, err := utils.GetRandomInt(16)
+	assert.NilError(t, err)
+	assert.Equal(t, 16, len(strconv.Itoa(int(state))))
+
+	// Test with zero length
+	state, err = utils.GetRandomInt(0)
+	assert.Error(t, err, "length must be greater than 0")
+}