dotenv, parsing fix email, moved dump tracnsport to new file gz, removed unwanted var jwt, added in HS256 sign/parse

ptr, ref and deref funcs response, use fmt.Fprint(f) validate, few new funcs

crypto/hash.go

@@ -17,14 +17,6 @@ func MD5(b []byte) string {
 	return hex.EncodeToString(hash[:])
 }
 
-/*
-func MD5Int(b []byte) uint64 {
-	n := new(big.Int)
-	n.SetString(MD5(b), 16)
-	return n.Uint64()
-}
-*/
-
 // SHA256 Sum256 is generally preferred over md5.hash due to its superior security and resistance to collision attacks
 func SHA256(b []byte) string {
 	hash := sha256.Sum256(b)

dotenv/assign.go

@@ -0,0 +1,83 @@
+package dotenv
+
+import (
+	"log/slog"
+	"reflect"
+	"strconv"
+	"strings"
+)
+
+// Assign env tag matching values from envMap
+func Assign[T any](to *T, envMap map[string]string) error {
+	if to == nil {
+		return nil
+	}
+
+	if len(envMap) == 0 {
+		return nil
+	}
+
+	val := reflect.Indirect(reflect.ValueOf(to))
+	name := val.Type().Name()
+	for i := range val.NumField() {
+		f := val.Type().Field(i)
+		tag := f.Tag.Get("env")
+		if tag == "" {
+			continue
+		}
+
+		var v string
+		var ok bool
+		if multiTag := strings.Split(tag, ","); len(multiTag) > 1 {
+			// multi tags like env:"DB_URL,PG_DB_URL"
+			for _, mt := range multiTag {
+				if v, ok = envMap[strings.TrimSpace(mt)]; ok {
+					break
+				}
+			}
+		} else {
+			v, ok = envMap[tag]
+		}
+
+		if !ok {
+			continue
+		}
+
+		field := val.FieldByName(f.Name)
+		if !field.IsValid() {
+			continue
+		}
+
+		switch f.Type.Kind() {
+		case reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Int:
+			if v, err := strconv.ParseInt(v, 10, 64); err != nil {
+				return err
+			} else {
+				field.SetInt(v)
+			}
+		case reflect.Float32, reflect.Float64:
+			if v, err := strconv.ParseFloat(v, 64); err != nil {
+				return err
+			} else {
+				field.SetFloat(v)
+			}
+		case reflect.Bool:
+			if strings.EqualFold(v, "true") {
+				field.SetBool(true)
+			} else {
+				field.SetBool(false)
+			}
+
+		default:
+			field.SetString(v)
+		}
+
+		if name == "" {
+			slog.Info("override value from env", "field", f.Name)
+		} else {
+			slog.Info("override value from env", "type", name, "field", f.Name)
+		}
+	}
+
+	return nil
+}

dotenv/parser.go

@@ -23,7 +23,7 @@ const (
 )
 
 func parseBytes(src []byte, out map[string]string) error {
-	src = bytes.Replace(src, []byte("\r\n"), []byte("\n"), -1)
+	src = bytes.ReplaceAll(src, []byte("\r\n"), []byte("\n"))
 	cutset := src
 	for {
 		cutset = getStatementStart(cutset)
@@ -76,8 +76,8 @@ func getStatementStart(src []byte) []byte {
 func locateKeyName(src []byte) (key string, cutset []byte, err error) {
 	// trim "export" and space at beginning
 	src = bytes.TrimLeftFunc(src, isSpace)
-	if bytes.HasPrefix(src, []byte(exportPrefix)) {
+	if after, ok := bytes.CutPrefix(src, []byte(exportPrefix)); ok {
-		trimmed := bytes.TrimPrefix(src, []byte(exportPrefix))
+		trimmed := after
 		if bytes.IndexFunc(trimmed, isSpace) == 0 {
 			src = bytes.TrimLeftFunc(trimmed, isSpace)
 		}

dotenv/read.go

@@ -22,14 +22,17 @@ func Read(dir string, filenames ...string) (envMap map[string]string, err error)
 
 	for _, filename := range filenames {
 		slog.Info("read .env", slog.String("file", filepath.Join(dir, filename)))
-		individualEnvMap, individualErr := readFile(filepath.Join(dir, filename))
+		m, er := readFile(filepath.Join(dir, filename))
-
+		if er != nil {
-		if individualErr != nil {
+			if os.IsNotExist(er) {
-			err = individualErr
+				slog.Info(".env not found", slog.String("file", filename))
+				continue
+			}
+			err = er
 			return
 		}
 
-		maps.Copy(envMap, individualEnvMap)
+		maps.Copy(envMap, m)
 	}
 
 	return

dotenv/write.go

@@ -56,7 +56,7 @@ func doubleQuoteEscape(line string) string {
 		if c == '\r' {
 			toReplace = `\r`
 		}
-		line = strings.Replace(line, string(c), toReplace, -1)
+		line = strings.ReplaceAll(line, string(c), toReplace)
 	}
 	return line
 }

email/transport.go

@@ -5,36 +5,6 @@
 
 package email
 
-import (
-	"os"
-	"path/filepath"
-	"time"
-
-	"code.patial.tech/go/appcore/open"
-)
-
 type Transport interface {
 	Send(*Message) error
 }
-
-// DumpToTemp transport is for development environment to ensure emails are renderd as HTML ok
-//
-// once dump operation is done it will try to open the html with default app for html
-type DumpToTemp struct{}
-
-func (DumpToTemp) Send(msg *Message) error {
-	// validate msg first
-	if err := msg.Validate(); err != nil {
-		return err
-	}
-
-	dir := os.TempDir()
-	id := time.Now().Format("20060102T150405999")
-	file := filepath.Join(dir, id+".html")
-
-	if err := os.WriteFile(file, []byte(msg.HtmlBody), 0440); err != nil {
-		return err
-	}
-
-	return open.WithDefaultApp(file)
-}

email/transport_dump.go

@@ -0,0 +1,30 @@
+package email
+
+import (
+	"os"
+	"path/filepath"
+
+	"code.patial.tech/go/appcore/open"
+	"github.com/google/uuid"
+)
+
+// DumpToTemp transport is for development environment to ensure emails are renderd as HTML ok
+// once dump operation is done it will try to open the html with default app for html
+type DumpToTemp struct{}
+
+func (DumpToTemp) Send(msg *Message) error {
+	// validate msg first
+	if err := msg.Validate(); err != nil {
+		return err
+	}
+
+	dir := os.TempDir()
+	id, _ := uuid.NewV7()
+	file := filepath.Join(dir, id.String()+".html")
+
+	if err := os.WriteFile(file, []byte(msg.HtmlBody), 0440); err != nil {
+		return err
+	}
+
+	return open.WithDefaultApp(file)
+}

email/transport_smtp.go

@@ -17,11 +17,12 @@ import (
 // SMTP mailer
 type SMTP struct {
 	Host     string
-	Port     int
 	Username string
 	Password string
 	// Domain name for smtp
 	Domain string
+
+	Port int
 }
 
 func (t SMTP) Send(msg *Message) error {

go.mod

@@ -1,21 +1,20 @@
 module code.patial.tech/go/appcore
 
-go 1.24
+go 1.25
 
 require (
-	github.com/go-playground/validator/v10 v10.26.0
+	github.com/go-playground/validator/v10 v10.27.0
-	github.com/golang-jwt/jwt/v5 v5.2.2
+	github.com/golang-jwt/jwt/v5 v5.3.0
 	github.com/google/uuid v1.6.0
 	github.com/sqids/sqids-go v0.4.1
-	golang.org/x/crypto v0.39.0
+	golang.org/x/crypto v0.42.0
 )
 
 require (
-	github.com/gabriel-vasile/mimetype v1.4.9 // indirect
+	github.com/gabriel-vasile/mimetype v1.4.10 // indirect
 	github.com/go-playground/locales v0.14.1 // indirect
 	github.com/go-playground/universal-translator v0.18.1 // indirect
 	github.com/leodido/go-urn v1.4.0 // indirect
-	golang.org/x/net v0.41.0 // indirect
+	golang.org/x/sys v0.36.0 // indirect
-	golang.org/x/sys v0.33.0 // indirect
+	golang.org/x/text v0.29.0 // indirect
-	golang.org/x/text v0.26.0 // indirect
 )

go.sum

@@ -1,19 +1,17 @@
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/gabriel-vasile/mimetype v1.4.8 h1:FfZ3gj38NjllZIeJAmMhr+qKL8Wu+nOoI3GqacKw1NM=
+github.com/gabriel-vasile/mimetype v1.4.10 h1:zyueNbySn/z8mJZHLt6IPw0KoZsiQNszIpU+bX4+ZK0=
-github.com/gabriel-vasile/mimetype v1.4.8/go.mod h1:ByKUIKGjh1ODkGM1asKUbQZOLGrPjydw3hYPU2YU9t8=
+github.com/gabriel-vasile/mimetype v1.4.10/go.mod h1:d+9Oxyo1wTzWdyVUPMmXFvp4F9tea18J8ufA774AB3s=
-github.com/gabriel-vasile/mimetype v1.4.9 h1:5k+WDwEsD9eTLL8Tz3L0VnmVh9QxGjRmjBvAG7U/oYY=
-github.com/gabriel-vasile/mimetype v1.4.9/go.mod h1:WnSQhFKJuBlRyLiKohA/2DtIlPFAbguNaG7QCHcyGok=
 github.com/go-playground/assert/v2 v2.2.0 h1:JvknZsQTYeFEAhQwI4qEt9cyV5ONwRHC+lYKSsYSR8s=
 github.com/go-playground/assert/v2 v2.2.0/go.mod h1:VDjEfimB/XKnb+ZQfWdccd7VUvScMdVu0Titje2rxJ4=
 github.com/go-playground/locales v0.14.1 h1:EWaQ/wswjilfKLTECiXz7Rh+3BjFhfDFKv/oXslEjJA=
 github.com/go-playground/locales v0.14.1/go.mod h1:hxrqLVvrK65+Rwrd5Fc6F2O76J/NuW9t0sjnWqG1slY=
 github.com/go-playground/universal-translator v0.18.1 h1:Bcnm0ZwsGyWbCzImXv+pAJnYK9S473LQFuzCbDbfSFY=
 github.com/go-playground/universal-translator v0.18.1/go.mod h1:xekY+UJKNuX9WP91TpwSH2VMlDf28Uj24BCp08ZFTUY=
-github.com/go-playground/validator/v10 v10.26.0 h1:SP05Nqhjcvz81uJaRfEV0YBSSSGMc/iMaVtFbr3Sw2k=
+github.com/go-playground/validator/v10 v10.27.0 h1:w8+XrWVMhGkxOaaowyKH35gFydVHOvC0/uWoy2Fzwn4=
-github.com/go-playground/validator/v10 v10.26.0/go.mod h1:I5QpIEbmr8On7W0TktmJAumgzX4CA1XNl4ZmDuVHKKo=
+github.com/go-playground/validator/v10 v10.27.0/go.mod h1:I5QpIEbmr8On7W0TktmJAumgzX4CA1XNl4ZmDuVHKKo=
-github.com/golang-jwt/jwt/v5 v5.2.2 h1:Rl4B7itRWVtYIHFrSNd7vhTiz9UpLdi6gZhZ3wEeDy8=
+github.com/golang-jwt/jwt/v5 v5.3.0 h1:pv4AsKCKKZuqlgs5sUmn4x8UlGa0kEVt/puTpKx9vvo=
-github.com/golang-jwt/jwt/v5 v5.2.2/go.mod h1:pqrtFR0X4osieyHYxtmOUWsAWrfe1Q5UVIyoH402zdk=
+github.com/golang-jwt/jwt/v5 v5.3.0/go.mod h1:fxCRLWMO43lRc8nhHWY6LGqRcf+1gQWArsqaEUEa5bE=
 github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
 github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/leodido/go-urn v1.4.0 h1:WT9HwE9SGECu3lg4d/dIA+jxlljEa1/ffXKmRjqdmIQ=
@@ -24,15 +22,11 @@ github.com/sqids/sqids-go v0.4.1 h1:eQKYzmAZbLlRwHeHYPF35QhgxwZHLnlmVj9AkIj/rrw=
 github.com/sqids/sqids-go v0.4.1/go.mod h1:EMwHuPQgSNFS0A49jESTfIQS+066XQTVhukrzEPScl8=
 github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
 github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
-golang.org/x/crypto v0.39.0 h1:SHs+kF4LP+f+p14esP5jAoDpHU8Gu/v9lFRK6IT5imM=
+golang.org/x/crypto v0.42.0 h1:chiH31gIWm57EkTXpwnqf8qeuMUi0yekh6mT2AvFlqI=
-golang.org/x/crypto v0.39.0/go.mod h1:L+Xg3Wf6HoL4Bn4238Z6ft6KfEpN0tJGo53AAPC632U=
+golang.org/x/crypto v0.42.0/go.mod h1:4+rDnOTJhQCx2q7/j6rAN5XDw8kPjeaXEUR2eL94ix8=
-golang.org/x/net v0.34.0 h1:Mb7Mrk043xzHgnRM88suvJFwzVrRfHEHJEl5/71CKw0=
+golang.org/x/sys v0.36.0 h1:KVRy2GtZBrk1cBYA7MKu5bEZFxQk4NIDV6RLVcC8o0k=
-golang.org/x/net v0.34.0/go.mod h1:di0qlW3YNM5oh6GqDGQr92MyTozJPmybPK4Ev/Gm31k=
+golang.org/x/sys v0.36.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=
-golang.org/x/net v0.41.0 h1:vBTly1HeNPEn3wtREYfy4GZ/NECgw2Cnl+nK6Nz3uvw=
+golang.org/x/text v0.29.0 h1:1neNs90w9YzJ9BocxfsQNHKuAT4pkghyXc4nhZ6sJvk=
-golang.org/x/net v0.41.0/go.mod h1:B/K4NNqkfmg07DQYrbwvSluqCJOOXwUjeb/5lOisjbA=
+golang.org/x/text v0.29.0/go.mod h1:7MhJOA9CD2qZyOKYazxdYMF85OwPdEr9jTtBpO7ydH4=
-golang.org/x/sys v0.33.0 h1:q3i8TbbEz+JRD9ywIRlyRAQbM0qF7hu24q3teo2hbuw=
-golang.org/x/sys v0.33.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k=
-golang.org/x/text v0.26.0 h1:P42AVeLghgTYr4+xUnTRKDMqpar+PtX7KWuNQL21L8M=
-golang.org/x/text v0.26.0/go.mod h1:QK15LZJUUQVJxhz7wXgxSy/CJaTFjd0G+YLonydOVQA=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

gz/gz.go

@@ -8,7 +8,6 @@ package gz
 import (
 	"bytes"
 	"compress/gzip"
-	"io"
 )
 
 func Zip(data []byte) ([]byte, error) {
@@ -31,7 +30,6 @@ func Zip(data []byte) ([]byte, error) {
 
 func UnZip(data []byte) ([]byte, error) {
 	b := bytes.NewBuffer(data)
-	var r io.Reader
 	r, err := gzip.NewReader(b)
 	if err != nil {
 		return nil, err

jwt/jwt.go

@@ -8,6 +8,7 @@ package jwt
 import (
 	"crypto/ed25519"
 	"errors"
+	"fmt"
 	"log"
 	"maps"
 	"time"
@@ -15,7 +16,18 @@ import (
 	"github.com/golang-jwt/jwt/v5"
 )
 
+// Sign using EdDSA
 func Sign(key ed25519.PrivateKey, claims map[string]any, issuer string, d time.Duration) (string, error) {
+	return SignEdDSA(key, claims, issuer, d)
+}
+
+func Parse(key ed25519.PrivateKey, tokenString string, issuer string) (jwt.MapClaims, error) {
+	return ParseEdDSA(key, tokenString, issuer)
+}
+
+// SignEdDSA (Edwards-curve Digital Signature Algorithm, typically Ed25519) is an excellent,
+// modern choice for JWT signing—arguably safer and more efficient than both HS256 and traditional RSA/ECDSA.
+func SignEdDSA(key ed25519.PrivateKey, claims map[string]any, issuer string, d time.Duration) (string, error) {
 	cl := jwt.MapClaims{
 		"iss": issuer,
 		"iat": jwt.NewNumericDate(time.Now().UTC()),
@@ -27,7 +39,7 @@ func Sign(key ed25519.PrivateKey, claims map[string]any, issuer string, d time.D
 	return t.SignedString(key)
 }
 
-func Parse(key ed25519.PrivateKey, tokenString string, issuer string) (jwt.MapClaims, error) {
+func ParseEdDSA(key ed25519.PrivateKey, tokenString string, issuer string) (jwt.MapClaims, error) {
 	token, err := jwt.Parse(
 		tokenString,
 		func(token *jwt.Token) (any, error) {
@@ -48,3 +60,40 @@ func Parse(key ed25519.PrivateKey, tokenString string, issuer string) (jwt.MapCl
 		return nil, errors.New("no claims found")
 	}
 }
+
+func SignHS256(secret []byte, claims map[string]any, issuer string, d time.Duration) (string, error) {
+	cl := jwt.MapClaims{
+		"iss": issuer,
+		"iat": jwt.NewNumericDate(time.Now().UTC()),
+		"exp": jwt.NewNumericDate(time.Now().Add(d)),
+	}
+	maps.Copy(cl, claims)
+
+	t := jwt.NewWithClaims(jwt.SigningMethodHS256, cl)
+	return t.SignedString(secret)
+}
+
+func ParseHS256(secret []byte, tokenString string, issuer string) (jwt.MapClaims, error) {
+	token, err := jwt.Parse(
+		tokenString,
+		func(token *jwt.Token) (any, error) {
+			if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
+				return nil, fmt.Errorf("unexpected signing method: %v", token.Header["alg"])
+			}
+			return secret, nil
+		},
+		jwt.WithValidMethods([]string{jwt.SigningMethodHS256.Alg()}),
+		jwt.WithIssuer(issuer),
+		jwt.WithIssuedAt(),
+		jwt.WithExpirationRequired(),
+	)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	if claims, ok := token.Claims.(jwt.MapClaims); ok {
+		return claims, nil
+	} else {
+		return nil, errors.New("no claims found")
+	}
+}

jwt/jwt_test.go

@@ -60,3 +60,28 @@ MC4CAQAwBQYDK2VwBCIEIMMkYUKJ9P0gp+Rm9mR4i0KUBT9nFUzxzxjH7sC0xq/F
 
 	fmt.Printf("%v", claims)
 }
+
+func TestHS256(t *testing.T) {
+	secret := []byte("c4c5fcb25e289e7a23763b013f04fd11b6b0247729216bb98d07f58332360aec")
+	claims := map[string]any{
+		"id":    1,
+		"email": "aa@aa.com",
+	}
+	issuer := "pat"
+
+	// Sign
+	jwt, err := SignHS256(secret, claims, issuer, time.Second)
+	if err != nil {
+		t.Error(err)
+		return
+	}
+
+	t.Log("jwt", jwt)
+
+	// Parse
+	_, err = ParseHS256(secret, jwt, issuer)
+	if err != nil {
+		t.Error(err)
+		return
+	}
+}

open/open_darwin.go

@@ -1,5 +1,3 @@
-//go:build darwin
-
 package open
 
 import (

open/open_linux.go

@@ -1,5 +1,3 @@
-//go:build linux
-
 package open
 
 import (

open/open_windows.go

@@ -1,5 +1,3 @@
-//go:build windows
-
 package open
 
 import (

ptr/ptr.go

@@ -7,15 +7,24 @@ package ptr
 
 import "strings"
 
+func Ref[T string | bool | Num](v T) *T {
+	return &v
+}
+
+func Deref[T any](v *T) T {
+	if v == nil {
+		var a T
+		return a
+	}
+	return *v
+}
+
 func Bool(v bool) *bool {
 	return &v
 }
 
 func GetBool(v *bool) bool {
-	if v == nil {
+	return Deref(v)
-		return false
-	}
-	return *v
 }
 
 func Str(v string) *string {
@@ -23,10 +32,7 @@ func Str(v string) *string {
 }
 
 func GetStr(v *string) string {
-	if v == nil {
+	return Deref(v)
-		return ""
-	}
-	return *v
 }
 
 func StrTrim(v *string) *string {
@@ -38,17 +44,14 @@ func StrTrim(v *string) *string {
 	return v
 }
 
-type N interface {
+type Num interface {
-	uint8 | int8 | uint16 | int16 | uint | int | uint32 | int32 | uint64 | int64 | float32 | float64
+	uint8 | int8 | uint16 | int16 | uint32 | int32 | uint64 | int64 | uint | int | float32 | float64
 }
 
-func Number[T N](v T) *T {
+func Number[T Num](v T) *T {
 	return &v
 }
 
-func GetNumber[T N](v *T) T {
+func GetNumber[T Num](v *T) T {
-	if v == nil {
+	return Deref(v)
-		return 0
-	}
-	return *v
 }

ptr/ptr_test.go

@@ -0,0 +1,36 @@
+package ptr
+
+import "testing"
+
+func TestRefDeref(t *testing.T) {
+	a := 10
+	if Deref(Ref(a)) != a {
+		t.Log("a) had a issue")
+		return
+	}
+
+	b := 10.1
+	if Deref(Ref(b)) != b {
+		t.Log("b) had a issue")
+		return
+	}
+
+	c := true
+	if Deref(Ref(c)) != c {
+		t.Log("c) had a issue")
+		return
+	}
+
+	d := "hello there"
+	if Deref(Ref(d)) != d {
+		t.Log("d) had a issue")
+		return
+	}
+
+	var e string
+	if Deref(Ref(e)) != e {
+		t.Log("e) had a issue")
+		return
+	}
+
+}

request/pager.go

@@ -14,12 +14,15 @@ import (
 )
 
 type Pager struct {
-	Search      string
 	OrderBy  *string `json:"orderBy"`
 	OrderAsc *bool   `json:"orderAsc"`
+
+	Search string
+
 	Page  int `json:"page"`
 	Size  int `json:"size"`
 	Total int `json:"total"`
+
 	TotalNeeded bool `json:"-"`
 }
 

response/reply.go

@@ -8,6 +8,7 @@ package response
 import (
 	"encoding/json"
 	"fmt"
+	"log/slog"
 	"net/http"
 
 	"code.patial.tech/go/appcore/request"
@@ -49,7 +50,10 @@ func reply(w http.ResponseWriter, data any, p *request.Pager) {
 	// if data is nil, let's pass it on as null
 	if data == nil {
 		w.WriteHeader(http.StatusOK)
-		w.Write([]byte("{\"data\":null}"))
+		_, writeErr := fmt.Fprint(w, "{\"data\":null}")
+		if writeErr != nil {
+			slog.Error(writeErr.Error())
+		}
 		return
 	}
 
@@ -64,30 +68,45 @@ func reply(w http.ResponseWriter, data any, p *request.Pager) {
 func BadRequest(w http.ResponseWriter, err error) {
 	w.Header().Set("Content-Type", "application/json")
 	w.WriteHeader(http.StatusBadRequest)
-	w.Write(fmt.Appendf(nil, "{\"error\": %q}", err.Error()))
+	_, writeErr := fmt.Fprintf(w, "{\"error\": %q}", err.Error())
+	if writeErr != nil {
+		slog.Error(writeErr.Error())
+	}
 }
 
 func InternalServerError(w http.ResponseWriter, err error) {
 	w.Header().Set("Content-Type", "application/json")
 	w.WriteHeader(http.StatusInternalServerError)
-	w.Write(fmt.Appendf(nil, "{\"error\": %q}", err.Error()))
+	_, writeErr := fmt.Fprintf(w, "{\"error\": %q}", err.Error())
+	if writeErr != nil {
+		slog.Error(writeErr.Error())
+	}
 }
 
 func SessionExpired(w http.ResponseWriter) {
 	w.Header().Set("Content-Type", "application/json")
 	w.WriteHeader(http.StatusUnauthorized)
-	w.Write([]byte("{\"error\": \"Session is expired, please login again\"}"))
+	_, writeErr := fmt.Fprint(w, "{\"error\": \"Session is expired, please login again\"}")
+	if writeErr != nil {
+		slog.Error(writeErr.Error())
+	}
 }
 
 func NotAutorized(w http.ResponseWriter) {
 	w.Header().Set("Content-Type", "application/json")
 	w.WriteHeader(http.StatusBadRequest)
-	w.Write([]byte("{\"error\": \"You are not authorized to perform this action\"}"))
+	_, writeErr := fmt.Fprint(w, "{\"error\": \"You are not authorized to perform this action\"}")
+	if writeErr != nil {
+		slog.Error(writeErr.Error())
+	}
 }
 
 // Forbidden response error
 func Forbidden(w http.ResponseWriter, err error) {
 	w.Header().Set("Content-Type", "application/json")
 	w.WriteHeader(http.StatusForbidden)
-	w.Write(fmt.Appendf(nil, "{\"error\": %q}", err.Error()))
+	_, writeErr := fmt.Fprintf(w, "{\"error\": %q}", err.Error())
+	if writeErr != nil {
+		slog.Error(writeErr.Error())
+	}
 }

structs/structs.go

@@ -12,7 +12,7 @@ import (
 func Map(obj any) map[string]any {
 	result := make(map[string]any)
 	val := reflect.ValueOf(obj)
-	if val.Kind() == reflect.Ptr {
+	if val.Kind() == reflect.Pointer {
 		val = val.Elem()
 	}
 

validate/validate.go

@@ -6,6 +6,8 @@
 package validate
 
 import (
+	"errors"
+	"fmt"
 	"reflect"
 	"strings"
 
@@ -24,8 +26,51 @@ func init() {
 		}
 		return name
 	})
+
 }
 
-func Struct(s any) error {
+// RegisterAlias for single/multuple tags
-	return validate.Struct(s)
+func RegisterAlias(alias, tags string) {
+	validate.RegisterAlias(alias, tags)
+}
+
+func RegisterValidation(tagName string, fn validator.Func, callValidationEvenIfNull ...bool) {
+	validate.RegisterValidation(tagName, fn, callValidationEvenIfNull...)
+}
+
+// Struct validator
+func Struct(s any) error {
+	err := validate.Struct(s)
+	if IsInvalidValidationError(err) {
+		return err
+	}
+
+	var valErrs validator.ValidationErrors
+	if !errors.As(err, &valErrs) {
+		return err
+	}
+
+	var sb strings.Builder
+	for _, err := range valErrs {
+		switch err.Tag() {
+		case "required":
+			sb.WriteString(fmt.Sprintf("%s: is required.\n", err.Field()))
+		case "email":
+			sb.WriteString(fmt.Sprintf("%s: is invalid.\n", err.Field()))
+		default:
+			sb.WriteString(fmt.Sprintf("%s: %q validation failed.\n", err.Field(), err.Tag()))
+		}
+	}
+
+	return errors.New(sb.String())
+}
+
+// Map validator
+func Map(data map[string]any, rules map[string]any) map[string]any {
+	return validate.ValidateMap(data, rules)
+}
+
+func IsInvalidValidationError(err error) bool {
+	var v *validator.InvalidValidationError
+	return errors.As(err, &v)
 }

validate/validate_test.go

@@ -0,0 +1,30 @@
+package validate
+
+import "testing"
+
+func TestStruct(t *testing.T) {
+	type person struct {
+		FirstName string `validate:"required,max=10"`
+		LastName  string `validate:"required"`
+		Email     string `validate:"email"`
+	}
+
+	var p *person
+	t.Log("check for nil value")
+	if err := Struct(p); err == nil {
+		t.Fatal("nil value must report and error")
+	} else {
+		t.Log(err.Error())
+	}
+
+	p = new(person)
+	t.Log("validation checks")
+	if err := Struct(p); err == nil {
+		t.Error(err)
+	} else {
+		t.Log(err)
+	}
+
+	// Structure error string
+
+}