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// 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)
ctx = context.WithValue(ctx, UserLanguageContextKey, session.Data.Language)
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}
}
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