main.go

func loginFn(c *gin.Context) {
	if c.Request.Method == http.MethodGet { // Serve login page
		c.HTML(http.StatusOK, "index", gin.H{
			"title": "Hi! GoBlog.",
		})
	} else if c.Request.Method == http.MethodPost { // Process login
		var login loginForm
		if err := c.ShouldBind(&login); err == nil {
			// TODO:
		} else {
			c.HTML(http.StatusOK, "index", gin.H{
				"title": "Hi! GoBlog.",
				"error": "Required fields not provided.",
			})
		}
	}
}