Created
June 6, 2020 20:23
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Golang Middleware Example
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package main | |
import ( | |
"fmt" | |
"net/http" | |
"net/url" | |
"os" | |
"github.com/gorilla/context" | |
"github.com/gorilla/handlers" | |
"github.com/gorilla/mux" | |
) | |
type wrapperMiddleware struct { | |
h http.Handler | |
} | |
func (h wrapperMiddleware) ServeHTTP(w http.ResponseWriter, r *http.Request) { | |
xCraft := r.Header.Values("X-CRAFT") | |
if len(xCraft) == 0 { | |
return | |
} | |
contextReq := http.Request{} | |
contextReq.URL, _ = url.Parse(xCraft[0]) | |
context.Set(r, "contextReq", &contextReq) | |
h.h.ServeHTTP(w, r) | |
} | |
func newWrapperMiddleware(h http.Handler) http.Handler { | |
return wrapperMiddleware{h} | |
} | |
type authenticatedMiddleware struct { | |
h http.Handler | |
} | |
func (h authenticatedMiddleware) ServeHTTP(w http.ResponseWriter, r *http.Request) { | |
contextReq := context.Get(r, "contextReq").(*http.Request) | |
client := &http.Client{} | |
fmt.Println(contextReq) | |
resp, err := client.Do(contextReq) | |
if err != nil { | |
w.WriteHeader(404) | |
return | |
} | |
fmt.Println(resp.StatusCode) | |
h.h.ServeHTTP(w, r) | |
} | |
func newAuthenticatedMiddleware(h http.Handler) http.Handler { | |
return authenticatedMiddleware{h} | |
} | |
func simpleRequestHandler(w http.ResponseWriter, r *http.Request) { | |
w.Write([]byte("Hello World!\n")) | |
} | |
func authenticatedEndpoint(w http.ResponseWriter, r *http.Request) { | |
w.Write([]byte("Hello Authenticated User!\n")) | |
} | |
func main() { | |
r := mux.NewRouter() | |
r.Handle("/", newAuthenticatedMiddleware(http.HandlerFunc(authenticatedEndpoint))) | |
r.Use(func(handler http.Handler) http.Handler { | |
return handlers.LoggingHandler(os.Stdout, handler) | |
}) | |
r.Use(handlers.CompressHandler) | |
r.Use(handlers.RecoveryHandler()) | |
r.Use(newWrapperMiddleware) | |
http.ListenAndServe(":8080", r) | |
} |
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