Context pre-processors

[wsantos]

Hi I need to extract data from context and expose it to the template, mainly sure info so I can show that the user is logged in on the page header, do we have a way to do it ? do you think that maybe we can have the same functionality as Config.Funcs but they receive context? here it's my test middleware and the data I need available on all templates.

// UserAuth -
func (m *Middleware) UserAuth(next echo.HandlerFunc) echo.HandlerFunc {
	return func(c echo.Context) error {
		sess, _ := session.Get("session", c)
		userId, _ := sess.Values["user_id"].(int)

		user, _ := models.FindUser(c.Request().Context(), m.DB, userId)

		c.Set("user", user)

		return next(c)
	}
}

And for echoview I think that this needs to go here, echoview.go

// Render render template for echo interface
func (e *ViewEngine) Render(w io.Writer, name string, data interface{}, c echo.Context) error {

    // call all context processors and transform data

	return e.RenderWriter(w, name, data)
}

Let me know if that is a good approach, but I'm not sure how to fit this on other frameworks.

[foolin]

Wrapper utils function for this data:

e.GET("/page", func(c echo.Context) error {

		return c.Render(http.StatusOK, "page.html", AuthData(c, echo.Map{"title": "Page file title!!"}))
})

func AuthData(c echo.Context, echo.Map) echo.Map{

  user := c.Get("user")
    //merge data with data
   return xxxx
}

[wsantos]

@foolin That's my point I don't want to need to add it to Render on every single Handler, here it's what I did, wdyt ?

// Template structure
type Template struct {
	ev *echoview.ViewEngine
}

// Render template
func (t *Template) Render(w io.Writer, name string, data interface{}, c echo.Context) error {

	// Add global methods if data is a map
	if viewContext, isMap := data.(echo.Map); isMap {
		viewContext["newVariable"] = "MyValue" // Here I can get the value from context
	}

	return t.ev.Render(w, name, data, c)
}

[foolin]

Well, that's a good way.

[wsantos]

Thank you @foolin