[feat] Add X-Remote-User header

In some cases there are needs to Authorize user not in Taskcafe itself.
For this reason option server.remote_user_header was added.

```toml
[server]
remote_user_header = true
```

With turned on Taskcafe listens X-Remote-User http header and skip
password checking. But still check user existence and active flag.

Author: Maxim Kernozhitskiy

.tmuxinator.yml

@@ -21,4 +21,4 @@ windows:
   - database:
       root: ./
       panes:
-        - pgcli postgres://taskcafe:taskcafe_test@localhost:8855/taskcafe
+        - pgcli postgres://taskcafe:taskcafe_test@localhost:8865/taskcafe

conf/taskcafe.example.toml

@@ -1,5 +1,6 @@
 [server]
 hostname = '0.0.0.0:3333'
+remote_user_header = false
 
 [email_notifications]
 enabled = true

docs/remote-auth.md

@@ -0,0 +1,8 @@
+# Remote authorize
+If you need to authenticate user with some proxy, you should use
+```toml
+[server]
+remote_user_header = true
+```
+With this option Taskcafe will take username from
+`X-Remote-User` HTTP header and will not check its password.

internal/commands/commands.go

@@ -81,6 +81,7 @@ func Execute() {
 	viper.SetDefault("database.password", "taskcafe_test")
 	viper.SetDefault("database.port", "5432")
 	viper.SetDefault("security.token_expiration", "15m")
+	viper.SetDefault("server.remote_user_header", "false")
 
 	viper.SetDefault("queue.broker", "amqp://guest:guest@localhost:5672/")
 	viper.SetDefault("queue.store", "memcache://localhost:11211")

internal/commands/web.go

@@ -75,15 +75,24 @@ func newWebCmd() *cobra.Command {
 				log.Warn("server.secret is not set, generating a random secret")
 				secret = uuid.New().String()
 			}
+
 			security, err := utils.GetSecurityConfig(viper.GetString("security.token_expiration"), []byte(secret))
-			r, _ := route.NewRouter(db, utils.EmailConfig{
-				From:               viper.GetString("smtp.from"),
-				Host:               viper.GetString("smtp.host"),
-				Port:               viper.GetInt("smtp.port"),
-				Username:           viper.GetString("smtp.username"),
-				Password:           viper.GetString("smtp.password"),
-				InsecureSkipVerify: viper.GetBool("smtp.skip_verify"),
-			}, security)
+			if err != nil {
+				log.Error(err)
+			}
+			security.IsExternalAuth = viper.GetBool("server.remote_user_header")
+
+			r, _ := route.NewRouter(db, route.Config{
+				Email: utils.EmailConfig{
+					From:               viper.GetString("smtp.from"),
+					Host:               viper.GetString("smtp.host"),
+					Port:               viper.GetInt("smtp.port"),
+					Username:           viper.GetString("smtp.username"),
+					Password:           viper.GetString("smtp.password"),
+					InsecureSkipVerify: viper.GetBool("smtp.skip_verify"),
+				},
+				Security: security,
+			})
 			log.WithFields(log.Fields{"url": viper.GetString("server.hostname")}).Info("starting server")
 			return http.ListenAndServe(viper.GetString("server.hostname"), r)
 		},

internal/route/auth.go

@@ -102,6 +102,15 @@ func (h *TaskcafeHandler) LogoutHandler(w http.ResponseWriter, r *http.Request)
 
 // LoginHandler creates a new refresh & access token for the user if given the correct credentials
 func (h *TaskcafeHandler) LoginHandler(w http.ResponseWriter, r *http.Request) {
+	if h.SecurityConfig.IsExternalAuth {
+		h.xHeaderAuthenticate(w, r)
+		return
+	}
+
+	h.credentialsHandler(w, r)
+}
+
+func (h *TaskcafeHandler) credentialsHandler(w http.ResponseWriter, r *http.Request) {
 	var requestData LoginRequestData
 	err := json.NewDecoder(r.Body).Decode(&requestData)
 	if err != nil {
@@ -139,9 +148,47 @@ func (h *TaskcafeHandler) LoginHandler(w http.ResponseWriter, r *http.Request) {
 	authCreatedAt := time.Now().UTC()
 	authExpiresAt := authCreatedAt.AddDate(0, 0, 1)
 	authToken, err := h.repo.CreateAuthToken(r.Context(), db.CreateAuthTokenParams{user.UserID, authCreatedAt, authExpiresAt})
+	if err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+		// TODO: should we return here?
+	}
+
+	w.Header().Set("Content-type", "application/json")
+	http.SetCookie(w, &http.Cookie{
+		Name:     "authToken",
+		Value:    authToken.TokenID.String(),
+		Expires:  authExpiresAt,
+		Path:     "/",
+		HttpOnly: true,
+	})
+	json.NewEncoder(w).Encode(LoginResponseData{Complete: true, UserID: authToken.UserID.String()})
+}
 
+func (h *TaskcafeHandler) xHeaderAuthenticate(w http.ResponseWriter, r *http.Request) {
+	xRemoteUser := r.Header.Get("X-Remote-User")
+	user, err := h.repo.GetUserAccountByUsername(r.Context(), xRemoteUser)
+	if err != nil {
+		log.WithFields(log.Fields{
+			"username": xRemoteUser,
+		}).Warn("user account not found")
+		w.WriteHeader(http.StatusUnauthorized)
+		return
+	}
+
+	if !user.Active {
+		log.WithFields(log.Fields{
+			"username": user.Username,
+		}).Warn("attempt to login with inactive user")
+		w.WriteHeader(http.StatusUnauthorized)
+		return
+	}
+
+	authCreatedAt := time.Now().UTC()
+	authExpiresAt := authCreatedAt.AddDate(0, 0, 1)
+	authToken, err := h.repo.CreateAuthToken(r.Context(), db.CreateAuthTokenParams{user.UserID, authCreatedAt, authExpiresAt})
 	if err != nil {
 		w.WriteHeader(http.StatusInternalServerError)
+		return
 	}
 
 	w.Header().Set("Content-type", "application/json")

internal/route/route.go

@@ -65,8 +65,13 @@ type TaskcafeHandler struct {
 	SecurityConfig utils.SecurityConfig
 }
 
+type Config struct {
+	Email    utils.EmailConfig
+	Security utils.SecurityConfig
+}
+
 // NewRouter creates a new router for chi
-func NewRouter(dbConnection *sqlx.DB, emailConfig utils.EmailConfig, securityConfig utils.SecurityConfig) (chi.Router, error) {
+func NewRouter(dbConnection *sqlx.DB, cfg Config) (chi.Router, error) {
 	formatter := new(log.TextFormatter)
 	formatter.TimestampFormat = "02-01-2006 15:04:05"
 	formatter.FullTimestamp = true
@@ -93,7 +98,7 @@ func NewRouter(dbConnection *sqlx.DB, emailConfig utils.EmailConfig, securityCon
 	}))
 
 	repository := db.NewRepository(dbConnection)
-	taskcafeHandler := TaskcafeHandler{*repository, securityConfig}
+	taskcafeHandler := TaskcafeHandler{*repository, cfg.Security}
 
 	var imgServer = http.FileServer(http.Dir("./uploads/"))
 	r.Group(func(mux chi.Router) {
@@ -108,7 +113,7 @@ func NewRouter(dbConnection *sqlx.DB, emailConfig utils.EmailConfig, securityCon
 	r.Group(func(mux chi.Router) {
 		mux.Use(auth.Middleware)
 		mux.Post("/users/me/avatar", taskcafeHandler.ProfileImageUpload)
-		mux.Handle("/graphql", graph.NewHandler(*repository, emailConfig))
+		mux.Handle("/graphql", graph.NewHandler(*repository, cfg.Email))
 	})
 
 	frontend := FrontendHandler{staticPath: "build", indexPath: "index.html"}

internal/utils/security.go

@@ -9,6 +9,7 @@ import (
 type SecurityConfig struct {
 	AccessTokenExpiration time.Duration
 	Secret                []byte
+	IsExternalAuth        bool
 }
 
 func GetSecurityConfig(accessTokenExp string, secret []byte) (SecurityConfig, error) {