basic auth

HTTP basic auth中间件，提供简单的认证方式，建议只用于内部管理系统。

Example

package main
import (
    "bytes"
    "github.com/vicanso/elton"
    "github.com/vicanso/elton/middleware"
    "github.com/vicanso/hes"
)
func main() {
    e := elton.New()
    e.Use(middleware.NewBasicAuth(middleware.BasicAuthConfig{
        Validate: func(account, pwd string, c *elton.Context) (bool, error) {
            if account == "tree.xie" && pwd == "password" {
                return true, nil
            }
            if account == "n" {
                return false, hes.New("account is invalid")
            }
            return false, nil
        },
    }))
    e.GET("/", func(c *elton.Context) (err error) {
        c.BodyBuffer = bytes.NewBufferString("hello world")
        return
    })
    err := e.ListenAndServe(":3000")
    if err != nil {
        panic(err)
    }
}