Update error page

- Add retry button for GET requests
- Only show signin button when it's a session error

renderer/model.go

@@ -34,7 +34,9 @@ type NavData struct {
 
 type ErrorData struct {
 	*CommonData
-	Error string
+	Err        string
+	Retry      bool
+	SessionErr bool
 }
 
 type HomePageData struct {

service/service.go

@@ -109,15 +109,21 @@ func (s *service) cdata(c *client, title string, count int, rinterval int,
 	return
 }
 
-func (s *service) ErrorPage(c *client, err error) error {
+func (s *service) ErrorPage(c *client, err error, retry bool) error {
 	var errStr string
+	var sessionErr bool
 	if err != nil {
 		errStr = err.Error()
+		if err == errInvalidSession || err == errInvalidCSRFToken {
+			sessionErr = true
+		}
 	}
 	cdata := s.cdata(nil, "error", 0, 0, "")
 	data := &renderer.ErrorData{
 		CommonData: cdata,
-		Error:      errStr,
+		Err:        errStr,
+		Retry:      retry,
+		SessionErr: sessionErr,
 	}
 	return s.renderer.Render(c.rctx, c.w, renderer.ErrorPage, data)
 }

service/transport.go

@@ -62,11 +62,11 @@ func redirect(c *client, url string) {
 func NewHandler(s *service, logger *log.Logger, staticDir string) http.Handler {
 	r := mux.NewRouter()
 
-	writeError := func(c *client, err error, t int) {
+	writeError := func(c *client, err error, t int, retry bool) {
 		switch t {
 		case HTML:
 			c.w.WriteHeader(http.StatusInternalServerError)
-			s.ErrorPage(c, err)
+			s.ErrorPage(c, err, retry)
 		case JSON:
 			c.w.WriteHeader(http.StatusInternalServerError)
 			json.NewEncoder(c.w).Encode(map[string]string{
@@ -110,13 +110,13 @@ func NewHandler(s *service, logger *log.Logger, staticDir string) http.Handler {
 
 			err = authenticate(c, at)
 			if err != nil {
-				writeError(c, err, rt)
+				writeError(c, err, rt, req.Method == http.MethodGet)
 				return
 			}
 
 			err = f(c)
 			if err != nil {
-				writeError(c, err, rt)
+				writeError(c, err, rt, req.Method == http.MethodGet)
 				return
 			}
 		}

templates/error.tmpl

@@ -2,10 +2,15 @@
 {{template "header.tmpl" (WithContext .CommonData $.Ctx)}}
 <div class="page-title"> Error </div>
 
-<div class="error-text"> {{.Error}} </div>
+<div class="error-text"> {{.Err}} </div>
 <div>
-	<a href="/timeline/home">Home</a>
+	<a href="/timeline/home">home</a>
-	<a href="/signin" target="_top">Sign In</a>
+	{{if .Retry}}
+	<a href="{{$.Ctx.Referrer}}">retry</a>
+	{{end}}
+	{{if .SessionErr}}
+	<a href="/signin" target="_top">signin</a>
+	{{end}}
 </div>
 
 {{template "footer.tmpl"}}