From 5a69a61d4841a35d7ddcb761a688db8c688314d6 Mon Sep 17 00:00:00 2001
From: Frédéric Guillot <fred@miniflux.net>
Date: Sun, 11 Nov 2018 11:28:29 -0800
Subject: Move UI middlewares and routes to ui package

---
 ui/middleware.go | 149 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 149 insertions(+)
 create mode 100644 ui/middleware.go

(limited to 'ui/middleware.go')

diff --git a/ui/middleware.go b/ui/middleware.go
new file mode 100644
index 0000000..6ec68ee
--- /dev/null
+++ b/ui/middleware.go
@@ -0,0 +1,149 @@
+// Copyright 2018 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 ui // import "miniflux.app/ui"
+
+import (
+	"context"
+	"errors"
+	"net/http"
+
+	"miniflux.app/config"
+	"miniflux.app/http/cookie"
+	"miniflux.app/http/request"
+	"miniflux.app/http/response/html"
+	"miniflux.app/http/route"
+	"miniflux.app/storage"
+	"miniflux.app/logger"
+	"miniflux.app/model"
+
+	"github.com/gorilla/mux"
+)
+
+type middleware struct {
+	router *mux.Router
+	cfg *config.Config
+	store *storage.Storage
+}
+
+func newMiddleware(router *mux.Router, cfg *config.Config, store *storage.Storage) *middleware {
+	return &middleware{router, cfg, store}
+}
+
+func (m *middleware) handleUserSession(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		session := m.getUserSessionFromCookie(r)
+
+		if session == nil {
+			logger.Debug("[UserSession] Session not found")
+			if m.isPublicRoute(r) {
+				next.ServeHTTP(w, r)
+			} else {
+				html.Redirect(w, r, route.Path(m.router, "login"))
+			}
+		} else {
+			logger.Debug("[UserSession] %s", session)
+
+			ctx := r.Context()
+			ctx = context.WithValue(ctx, request.UserIDContextKey, session.UserID)
+			ctx = context.WithValue(ctx, request.IsAuthenticatedContextKey, true)
+			ctx = context.WithValue(ctx, request.UserSessionTokenContextKey, session.Token)
+
+			next.ServeHTTP(w, r.WithContext(ctx))
+		}
+	})
+}
+
+func (m *middleware) handleAppSession(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		var err error
+		session := m.getAppSessionValueFromCookie(r)
+
+		if session == nil {
+			logger.Debug("[AppSession] Session not found")
+
+			session, err = m.store.CreateSession()
+			if err != nil {
+				html.ServerError(w, r, err)
+				return
+			}
+
+			http.SetCookie(w, cookie.New(cookie.CookieSessionID, session.ID, m.cfg.IsHTTPS, m.cfg.BasePath()))
+		} else {
+			logger.Debug("[AppSession] %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(`[AppSession] Invalid or missing CSRF token: Form="%s", Header="%s"`, formValue, headerValue)
+				html.BadRequest(w, r, errors.New("Invalid or missing CSRF"))
+				return
+			}
+		}
+
+		ctx := r.Context()
+		ctx = context.WithValue(ctx, request.SessionIDContextKey, session.ID)
+		ctx = context.WithValue(ctx, request.CSRFContextKey, session.Data.CSRF)
+		ctx = context.WithValue(ctx, request.OAuth2StateContextKey, session.Data.OAuth2State)
+		ctx = context.WithValue(ctx, request.FlashMessageContextKey, session.Data.FlashMessage)
+		ctx = context.WithValue(ctx, request.FlashErrorMessageContextKey, session.Data.FlashErrorMessage)
+		ctx = context.WithValue(ctx, request.UserLanguageContextKey, session.Data.Language)
+		ctx = context.WithValue(ctx, request.UserThemeContextKey, session.Data.Theme)
+		ctx = context.WithValue(ctx, request.PocketRequestTokenContextKey, session.Data.PocketRequestToken)
+		next.ServeHTTP(w, r.WithContext(ctx))
+	})
+}
+
+func (m *middleware) getAppSessionValueFromCookie(r *http.Request) *model.Session {
+	cookieValue := request.CookieValue(r, cookie.CookieSessionID)
+	if cookieValue == "" {
+		return nil
+	}
+
+	session, err := m.store.Session(cookieValue)
+	if err != nil {
+		logger.Error("[AppSession] %v", err)
+		return nil
+	}
+
+	return session
+}
+
+func (m *middleware) isPublicRoute(r *http.Request) bool {
+	route := mux.CurrentRoute(r)
+	switch route.GetName() {
+	case "login",
+		"checkLogin",
+		"stylesheet",
+		"javascript",
+		"oauth2Redirect",
+		"oauth2Callback",
+		"appIcon",
+		"favicon",
+		"webManifest",
+		"robots",
+		"healthcheck":
+		return true
+	default:
+		return false
+	}
+}
+
+func (m *middleware) getUserSessionFromCookie(r *http.Request) *model.UserSession {
+	cookieValue := request.CookieValue(r, cookie.CookieUserSessionID)
+	if cookieValue == "" {
+		return nil
+	}
+
+	session, err := m.store.UserSessionByToken(cookieValue)
+	if err != nil {
+		logger.Error("[UserSession] %v", err)
+		return nil
+	}
+
+	return session
+}
-- 
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