Created
June 27, 2022 13:35
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Middleware Example Echo Golang
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| package main | |
| import ( | |
| "fmt" | |
| "github.com/labstack/echo/v4" | |
| "net/http" | |
| ) | |
| /* | |
| 1. type MiddlewareFunc func(next HandlerFunc) HandlerFunc | |
| 2. type HandlerFunc func(c Context) error | |
| 3. func (e *Echo) GET(path string, h HandlerFunc, m ...MiddlewareFunc) *Route | |
| */ | |
| func main() { | |
| e := echo.New() | |
| f := e.Group("/first", MiddlewareFirst) | |
| f.GET("", FirstHandler) | |
| s := e.Group("/second", MiddlewareSecond) | |
| s.GET("", SecondHandler) | |
| e.Logger.Fatal(e.Start(":8888")) | |
| } | |
| func FirstHandler(c echo.Context) error { | |
| fmt.Println("Ini Handler 1") | |
| return c.String(http.StatusOK, "Hello, World!") | |
| } | |
| func SecondHandler(c echo.Context) error { | |
| fmt.Println("Ini Handler 2") | |
| return c.String(http.StatusOK, "Hello, World!") | |
| } | |
| func MiddlewareFirst(next echo.HandlerFunc) echo.HandlerFunc { | |
| // logic middleware | |
| return func(c echo.Context) error { | |
| // logic middleware | |
| if c.Request().Header.Get("User-Agent") != "POSTMAN" { | |
| return c.JSON(401, nil) | |
| } | |
| return next(c) | |
| } | |
| } | |
| func MiddlewareSecond(next echo.HandlerFunc) echo.HandlerFunc { | |
| // logic middleware | |
| return func(c echo.Context) error { | |
| // logic middleware | |
| fmt.Println("ini middleware second") | |
| //if true { | |
| // return c.JSON(401, nil) | |
| //} | |
| return next(c) | |
| } | |
| } | |
| /* | |
| MiddlewareSecond[ MiddlewareFirst[ FirstHandler[ eksekusi ] ] ] | |
| */ |
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