chore(project): bootstrap project tree

internal/session/user_email.go

@@ -0,0 +1,116 @@
+package session
+
+import (
+	"context"
+	"net/http"
+
+	"github.com/pkg/errors"
+	"gitlab.com/wpetit/goweb/middleware/container"
+	"gitlab.com/wpetit/goweb/service/session"
+)
+
+type contextKey string
+
+const userEmailKey contextKey = "user_email"
+
+var (
+	ErrUserEmailNotFound = errors.New("user email not found")
+)
+
+func UserEmailMiddleware(next http.Handler) http.Handler {
+	fn := func(w http.ResponseWriter, r *http.Request) {
+		userEmail, err := GetUserEmail(w, r)
+		if err != nil {
+			http.Error(w, http.StatusText(http.StatusUnauthorized), http.StatusUnauthorized)
+
+			return
+		}
+
+		ctx := WithUserEmail(r.Context(), userEmail)
+		r = r.WithContext(ctx)
+
+		next.ServeHTTP(w, r)
+	}
+
+	return http.HandlerFunc(fn)
+}
+
+func WithUserEmail(ctx context.Context, email string) context.Context {
+	return context.WithValue(ctx, userEmailKey, email)
+}
+
+func UserEmail(ctx context.Context) (string, error) {
+	email, ok := ctx.Value(userEmailKey).(string)
+	if !ok {
+		return "", errors.WithStack(ErrUserEmailNotFound)
+	}
+
+	return email, nil
+}
+
+func SaveUserEmail(w http.ResponseWriter, r *http.Request, email string) error {
+	sess, err := getSession(w, r)
+	if err != nil {
+		return errors.WithStack(err)
+	}
+
+	sess.Set(string(userEmailKey), email)
+
+	if err := sess.Save(w, r); err != nil {
+		return errors.WithStack(err)
+	}
+
+	return nil
+}
+
+func ClearUserEmail(w http.ResponseWriter, r *http.Request, saveSession bool) error {
+	sess, err := getSession(w, r)
+	if err != nil {
+		return errors.WithStack(err)
+	}
+
+	sess.Unset(string(userEmailKey))
+
+	if saveSession {
+		if err := sess.Save(w, r); err != nil {
+			return errors.WithStack(err)
+		}
+	}
+
+	return nil
+}
+
+func GetUserEmail(w http.ResponseWriter, r *http.Request) (string, error) {
+	sess, err := getSession(w, r)
+	if err != nil {
+		return "", errors.WithStack(err)
+	}
+
+	email, ok := sess.Get(string(userEmailKey)).(string)
+	if !ok {
+		return "", errors.WithStack(ErrUserEmailNotFound)
+	}
+
+	return email, nil
+}
+
+func getSession(w http.ResponseWriter, r *http.Request) (session.Session, error) {
+	ctx := r.Context()
+
+	ctn, err := container.From(ctx)
+	if err != nil {
+		return nil, errors.WithStack(err)
+	}
+
+	session, err := session.From(ctn)
+	if err != nil {
+		return nil, errors.WithStack(err)
+	}
+
+	sess, err := session.Get(w, r)
+	if err != nil {
+		return nil, errors.WithStack(err)
+	}
+
+	return sess, nil
+}