commit 2916082d5ed94ef86ad58bdb7256ae07b214c4f3
Author: Alexander NeonXP Kiryukhin <i@neonxp.ru>
Date:   Mon Jul 29 02:38:17 2024 +0300

    Начальный коммит

diff --git a/binder.go b/binder.go
new file mode 100644
index 0000000..f618a1a
--- /dev/null
+++ b/binder.go
@@ -0,0 +1,88 @@
+package mux
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"net/url"
+	"reflect"
+	"strconv"
+	"strings"
+)
+
+func Bind[T any](r *http.Request, obj *T) error {
+	contentType := r.Header.Get("Content-Type")
+	switch {
+	case strings.HasPrefix(contentType, "multipart/form-data"),
+		strings.HasPrefix(contentType, "application/x-www-form-urlencoded"):
+		if err := r.ParseForm(); err != nil {
+			return err
+		}
+		return bindForm(r.Form, obj)
+	case strings.HasPrefix(contentType, "application/json"):
+		defer r.Body.Close()
+		return json.NewDecoder(r.Body).Decode(obj)
+	case r.Method == http.MethodGet:
+		return bindForm(r.URL.Query(), obj)
+	case r.Method == http.MethodPost:
+		return fmt.Errorf("invalid content-type: %s", contentType)
+	}
+
+	return nil
+}
+
+func bindForm(values url.Values, obj any) error {
+	val := reflect.ValueOf(obj)
+	if val.Kind() == reflect.Ptr {
+		val = val.Elem()
+	}
+
+	fields := val.NumField()
+
+	for i := 0; i < fields; i++ {
+		f := val.Field(i)
+		if !f.IsValid() {
+			continue
+		}
+		if !f.CanSet() {
+			continue
+		}
+		t := val.Type().Field(i)
+		k := t.Tag.Get("form")
+		if k == "" {
+			continue
+		}
+		if !values.Has(k) {
+			continue
+		}
+		v := values.Get(k)
+
+		switch f.Type().Kind() {
+		case reflect.Bool:
+			switch v {
+			case "on", "true", "1":
+				f.SetBool(true)
+			default:
+				f.SetBool(false)
+			}
+		case reflect.Int, reflect.Int64:
+			if i, e := strconv.ParseInt(v, 0, 0); e == nil {
+				f.SetInt(i)
+			} else {
+				return fmt.Errorf("could not set int value of %s: %s", k, e)
+			}
+		case reflect.Float64:
+			if fl, e := strconv.ParseFloat(v, 64); e == nil {
+				f.SetFloat(fl)
+			} else {
+				return fmt.Errorf("could not set float64 value of %s: %s", k, e)
+			}
+		case reflect.String:
+			f.SetString(v)
+		default:
+			return fmt.Errorf("unsupported format %v for field %s", f.Type().Kind(), k)
+		}
+	}
+
+	return nil
+}
diff --git a/error.go b/error.go
new file mode 100644
index 0000000..416d578
--- /dev/null
+++ b/error.go
@@ -0,0 +1,19 @@
+package mux
+
+import (
+	"context"
+	"encoding/json"
+	"io"
+)
+
+var DefaultErrorHandler func(err error) Renderer = func(err error) Renderer {
+	return RendererFunc(func(ctx context.Context, w io.Writer) error {
+		return json.NewEncoder(w).Encode(errorStruct{
+			Message: err.Error(),
+		})
+	})
+}
+
+type errorStruct struct {
+	Message string `json:"message"`
+}
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..2c9b4ee
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,5 @@
+module go.neonxp.ru/mux
+
+go 1.22.5
+
+require go.neonxp.ru/objectid v0.0.2
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..3ce48c1
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,2 @@
+go.neonxp.ru/objectid v0.0.2 h1:Z/G6zvBxmUq0NTq681oGH8pTbBWwi6VA22YOYludIPs=
+go.neonxp.ru/objectid v0.0.2/go.mod h1:s0dRi//oe1liiKcor1KmWx09WzkD6Wtww8ZaIv+VLBs=
diff --git a/middleware.go b/middleware.go
new file mode 100644
index 0000000..2b56105
--- /dev/null
+++ b/middleware.go
@@ -0,0 +1,13 @@
+package mux
+
+import "net/http"
+
+type Middleware func(http.Handler) http.Handler
+
+func Use(handler http.Handler, middlewares ...Middleware) http.Handler {
+	for _, h := range middlewares {
+		handler = h(handler)
+	}
+
+	return handler
+}
diff --git a/middleware/context.go b/middleware/context.go
new file mode 100644
index 0000000..b9ad45f
--- /dev/null
+++ b/middleware/context.go
@@ -0,0 +1,11 @@
+package middleware
+
+type ctxKey int
+
+const (
+	requestIDKey ctxKey = iota
+	sessionIDKey
+	sessionValueKey
+	sessionConfigKey
+	sessionStorerKey
+)
diff --git a/middleware/logger.go b/middleware/logger.go
new file mode 100644
index 0000000..80117da
--- /dev/null
+++ b/middleware/logger.go
@@ -0,0 +1,48 @@
+package middleware
+
+import (
+	"log/slog"
+	"net/http"
+	"time"
+
+	"go.neonxp.ru/mux"
+)
+
+type wrappedResponse struct {
+	http.ResponseWriter
+	statusCode int
+}
+
+func (w *wrappedResponse) WriteHeader(code int) {
+	w.statusCode = code
+	w.ResponseWriter.WriteHeader(code)
+}
+
+func Logger(logger *slog.Logger) mux.Middleware {
+	return func(next http.Handler) http.Handler {
+		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			requestID := GetRequestID(r)
+			args := []any{
+				slog.String("proto", r.Proto),
+				slog.String("method", r.Method),
+				slog.String("request_uri", r.RequestURI),
+				slog.String("request_id", requestID),
+			}
+			logger.InfoContext(
+				r.Context(),
+				"start request",
+				args...,
+			)
+			t := time.Now()
+			wr := &wrappedResponse{ResponseWriter: w, statusCode: http.StatusOK}
+			next.ServeHTTP(wr, r)
+			args = append(args, slog.String("response_time", time.Since(t).String()))
+			args = append(args, slog.Int("response_status", wr.statusCode))
+			logger.InfoContext(
+				r.Context(),
+				"finish request",
+				args...,
+			)
+		})
+	}
+}
diff --git a/middleware/recover.go b/middleware/recover.go
new file mode 100644
index 0000000..b34d582
--- /dev/null
+++ b/middleware/recover.go
@@ -0,0 +1,33 @@
+package middleware
+
+import (
+	"log/slog"
+	"net/http"
+
+	"go.neonxp.ru/mux"
+)
+
+func Recover(logger *slog.Logger) mux.Middleware {
+	return func(next http.Handler) http.Handler {
+		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			defer func() {
+				err := recover()
+				if err == nil {
+					return
+				}
+				requestID := GetRequestID(r)
+				logger.ErrorContext(
+					r.Context(),
+					"panic",
+					slog.Any("panic", err),
+					slog.String("proto", r.Proto),
+					slog.String("method", r.Method),
+					slog.String("request_uri", r.RequestURI),
+					slog.String("request_id", requestID),
+				)
+			}()
+
+			next.ServeHTTP(w, r)
+		})
+	}
+}
diff --git a/middleware/request_id.go b/middleware/request_id.go
new file mode 100644
index 0000000..016b44a
--- /dev/null
+++ b/middleware/request_id.go
@@ -0,0 +1,35 @@
+package middleware
+
+import (
+	"context"
+	"net/http"
+
+	"go.neonxp.ru/objectid"
+)
+
+const RequestIDHeader string = "X-Request-ID"
+
+func RequestID(next http.Handler) http.Handler {
+	objectid.Seed()
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		requestID := r.Header.Get(RequestIDHeader)
+		if requestID == "" {
+			requestID = objectid.New().String()
+		}
+
+		next.ServeHTTP(w, r.WithContext(context.WithValue(r.Context(), requestIDKey, requestID)))
+	})
+}
+
+func GetRequestID(r *http.Request) string {
+	rid := r.Context().Value(requestIDKey)
+	if rid == nil {
+		return ""
+	}
+	srid, ok := rid.(string)
+	if !ok {
+		return ""
+	}
+
+	return srid
+}
diff --git a/middleware/session.go b/middleware/session.go
new file mode 100644
index 0000000..838e088
--- /dev/null
+++ b/middleware/session.go
@@ -0,0 +1,89 @@
+package middleware
+
+import (
+	"context"
+	"errors"
+	"net/http"
+
+	"go.neonxp.ru/mux"
+	"go.neonxp.ru/mux/middleware/session"
+	"go.neonxp.ru/objectid"
+)
+
+type SessionConfig struct {
+	SessionCookie string
+	Path          string
+	Domain        string
+	Secure        bool
+	HttpOnly      bool
+	MaxAge        int
+}
+
+var DefaultSessionConfig SessionConfig = SessionConfig{
+	SessionCookie: "_session",
+	Path:          "/",
+	Domain:        "",
+	Secure:        false,
+	HttpOnly:      true,
+	MaxAge:        30 * 3600,
+}
+
+func Session(config SessionConfig, storer session.Store) mux.Middleware {
+	return func(h http.Handler) http.Handler {
+		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			var (
+				sessionID string
+				values    session.Value
+			)
+			cookie, err := r.Cookie(config.SessionCookie)
+			switch {
+			case err == nil:
+				sessionID = cookie.Value
+				values = storer.Load(r.Context(), sessionID)
+			case errors.Is(err, http.ErrNoCookie):
+				sessionID = objectid.New().String()
+				values = session.Value{}
+			}
+
+			http.SetCookie(w, &http.Cookie{
+				Name:     config.SessionCookie,
+				Value:    sessionID,
+				Path:     config.Path,
+				Domain:   config.Domain,
+				Secure:   config.Secure,
+				HttpOnly: config.HttpOnly,
+				MaxAge:   config.MaxAge,
+			})
+
+			ctx := context.WithValue(r.Context(), sessionValueKey, &values)
+			ctx = context.WithValue(ctx, sessionIDKey, sessionID)
+			ctx = context.WithValue(ctx, sessionConfigKey, config)
+			ctx = context.WithValue(ctx, sessionStorerKey, storer)
+
+			h.ServeHTTP(w, r.WithContext(ctx))
+
+			storer.Save(r.Context(), sessionID, values)
+
+		})
+	}
+}
+
+func SessionFromRequest(r *http.Request) *session.Value {
+	return r.Context().Value(sessionValueKey).(*session.Value)
+}
+
+func ClearSession(w http.ResponseWriter, r *http.Request) {
+	storer := r.Context().Value(sessionStorerKey).(session.Store)
+	sessionID := r.Context().Value(sessionIDKey).(string)
+	storer.Remove(r.Context(), sessionID)
+	config := r.Context().Value(sessionConfigKey).(SessionConfig)
+	http.SetCookie(w, &http.Cookie{
+		Name:     config.SessionCookie,
+		Value:    sessionID,
+		Path:     config.Path,
+		Domain:   config.Domain,
+		Secure:   config.Secure,
+		HttpOnly: config.HttpOnly,
+		MaxAge:   -1,
+	})
+}
diff --git a/middleware/session/bbolt.go b/middleware/session/bbolt.go
new file mode 100644
index 0000000..1068ed8
--- /dev/null
+++ b/middleware/session/bbolt.go
@@ -0,0 +1,71 @@
+package session
+
+import (
+	"bytes"
+	"context"
+	"encoding/gob"
+	"log/slog"
+
+	"go.etcd.io/bbolt"
+)
+
+func New(db *bbolt.DB, bucketName []byte) Store {
+	return &BoltStore{
+		db:         db,
+		bucketName: bucketName,
+	}
+}
+
+type BoltStore struct {
+	db         *bbolt.DB
+	bucketName []byte
+}
+
+func (s *BoltStore) Load(ctx context.Context, sessionID string) Value {
+	v := Value{}
+	err := s.db.View(func(tx *bbolt.Tx) error {
+		bucket := tx.Bucket(s.bucketName)
+		if bucket == nil {
+			// no bucket -- normal situation
+			return nil
+		}
+		vb := bucket.Get([]byte(sessionID))
+		if vb == nil {
+			// no session -- no error
+			return nil
+		}
+		rdr := bytes.NewBuffer(vb)
+
+		return gob.NewDecoder(rdr).Decode(&v)
+	})
+	if err != nil {
+		slog.WarnContext(ctx, "failed load session", slog.Any("error", err))
+	}
+	return v
+}
+
+func (s *BoltStore) Save(ctx context.Context, sessionID string, value Value) error {
+	return s.db.Update(func(tx *bbolt.Tx) error {
+		bucket, err := tx.CreateBucketIfNotExists(s.bucketName)
+		if err != nil {
+			return err
+		}
+		wrt := bytes.NewBuffer([]byte{})
+		if err := gob.NewEncoder(wrt).Encode(value); err != nil {
+			return err
+		}
+
+		return bucket.Put([]byte(sessionID), wrt.Bytes())
+	})
+}
+
+func (s *BoltStore) Remove(ctx context.Context, sessionID string) error {
+	return s.db.Update(func(tx *bbolt.Tx) error {
+		bucket, err := tx.CreateBucketIfNotExists(s.bucketName)
+		if err != nil {
+			return err
+		}
+
+		return bucket.Delete([]byte(sessionID))
+	})
+}
diff --git a/middleware/session/memstore.go b/middleware/session/memstore.go
new file mode 100644
index 0000000..2fcef39
--- /dev/null
+++ b/middleware/session/memstore.go
@@ -0,0 +1,31 @@
+package session
+
+import (
+	"context"
+	"sync"
+)
+
+type MemoryStore struct {
+	store sync.Map
+}
+
+func (s *MemoryStore) Load(ctx context.Context, sessionID string) Value {
+	val, ok := s.store.Load(sessionID)
+	if ok {
+		return val.(Value)
+	}
+
+	return Value{}
+}
+
+func (s *MemoryStore) Save(ctx context.Context, sessionID string, value Value) error {
+	s.store.Store(sessionID, value)
+
+	return nil
+}
+
+func (s *MemoryStore) Remove(ctx context.Context, sessionID string) error {
+	s.store.Delete(sessionID)
+
+	return nil
+}
diff --git a/middleware/session/store.go b/middleware/session/store.go
new file mode 100644
index 0000000..b74a8aa
--- /dev/null
+++ b/middleware/session/store.go
@@ -0,0 +1,18 @@
+package session
+
+import (
+	"context"
+	"errors"
+)
+
+var (
+	ErrSessionNotFound = errors.New("session not found")
+)
+
+type Store interface {
+	Load(ctx context.Context, sessionID string) Value
+	Save(ctx context.Context, sessionID string, value Value) error
+	Remove(ctx context.Context, sessionID string) error
+}
+
+type Value map[string]any
diff --git a/redirect.go b/redirect.go
new file mode 100644
index 0000000..a392234
--- /dev/null
+++ b/redirect.go
@@ -0,0 +1,8 @@
+package mux
+
+import "net/http"
+
+func Redirect(w http.ResponseWriter, code int, location string) {
+	w.Header().Add("Location", location)
+	w.WriteHeader(code)
+}
diff --git a/render.go b/render.go
new file mode 100644
index 0000000..8b39090
--- /dev/null
+++ b/render.go
@@ -0,0 +1,24 @@
+package mux
+
+import (
+	"context"
+	"io"
+	"log/slog"
+	"net/http"
+)
+
+type Renderer interface {
+	Render(context.Context, io.Writer) error
+}
+
+func Render(w http.ResponseWriter, r *http.Request, renderable Renderer) {
+	if err := renderable.Render(r.Context(), w); err != nil {
+		slog.ErrorContext(r.Context(), "failed render template", slog.Any("err", err))
+	}
+}
+
+type RendererFunc func(context.Context, io.Writer) error
+
+func (r RendererFunc) Render(ctx context.Context, w io.Writer) error {
+	return r(ctx, w)
+}