1 files changed, 84 insertions, 0 deletions
diff --git a/http/middleware/session.go b/http/middleware/session.go
new file mode 100644
index 0000000..a0e9fbd
--- /dev/null
+++ b/http/middleware/session.go
@@ -0,0 +1,84 @@
+// Copyright 2017 Frédéric Guillot. All rights reserved.
+// Use of this source code is governed by the Apache 2.0
+// license that can be found in the LICENSE file.
+
+package middleware
+
+import (
+	"context"
+	"net/http"
+
+	"github.com/miniflux/miniflux/config"
+	"github.com/miniflux/miniflux/http/cookie"
+	"github.com/miniflux/miniflux/logger"
+	"github.com/miniflux/miniflux/model"
+	"github.com/miniflux/miniflux/storage"
+)
+
+// SessionMiddleware represents a session middleware.
+type SessionMiddleware struct {
+	cfg   *config.Config
+	store *storage.Storage
+}
+
+// Handler execute the middleware.
+func (s *SessionMiddleware) Handler(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		var err error
+		session := s.getSessionValueFromCookie(r)
+
+		if session == nil {
+			logger.Debug("[Middleware:Session] Session not found")
+			session, err = s.store.CreateSession()
+			if err != nil {
+				logger.Error("[Middleware:Session] %v", err)
+				http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
+				return
+			}
+
+			http.SetCookie(w, cookie.New(cookie.CookieSessionID, session.ID, s.cfg.IsHTTPS))
+		} else {
+			logger.Debug("[Middleware:Session] %s", session)
+		}
+
+		if r.Method == "POST" {
+			formValue := r.FormValue("csrf")
+			headerValue := r.Header.Get("X-Csrf-Token")
+
+			if session.Data.CSRF != formValue && session.Data.CSRF != headerValue {
+				logger.Error(`[Middleware:Session] Invalid or missing CSRF token: Form="%s", Header="%s"`, formValue, headerValue)
+				w.WriteHeader(http.StatusBadRequest)
+				w.Write([]byte("Invalid or missing CSRF session!"))
+				return
+			}
+		}
+
+		ctx := r.Context()
+		ctx = context.WithValue(ctx, SessionIDContextKey, session.ID)
+		ctx = context.WithValue(ctx, CSRFContextKey, session.Data.CSRF)
+		ctx = context.WithValue(ctx, OAuth2StateContextKey, session.Data.OAuth2State)
+		ctx = context.WithValue(ctx, FlashMessageContextKey, session.Data.FlashMessage)
+		ctx = context.WithValue(ctx, FlashErrorMessageContextKey, session.Data.FlashErrorMessage)
+		next.ServeHTTP(w, r.WithContext(ctx))
+	})
+}
+
+func (s *SessionMiddleware) getSessionValueFromCookie(r *http.Request) *model.Session {
+	sessionCookie, err := r.Cookie(cookie.CookieSessionID)
+	if err == http.ErrNoCookie {
+		return nil
+	}
+
+	session, err := s.store.Session(sessionCookie.Value)
+	if err != nil {
+		logger.Error("[Middleware:Session] %v", err)
+		return nil
+	}
+
+	return session
+}
+
+// NewSessionMiddleware returns a new SessionMiddleware.
+func NewSessionMiddleware(cfg *config.Config, store *storage.Storage) *SessionMiddleware {
+	return &SessionMiddleware{cfg, store}
+}