Начальный коммит

8 files changed, 336 insertions, 0 deletions

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