minio/generic-web-handlers.go

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package main
import (
"fmt"
"net/http"
"github.com/dgrijalva/jwt-go"
)
type authHandler struct {
handler http.Handler
}
// AuthHandler -
// Verify if authorization header has signature version '2', reject it cleanly.
func AuthHandler(h http.Handler) http.Handler {
return authHandler{h}
}
// Ignore request if authorization header is not valid.
func (h authHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
// For login attempts please issue a new token.
if r.Method == "POST" && r.URL.Path == "/login-token" {
h.handler.ServeHTTP(w, r)
return
}
authBackend := InitJWT()
token, err := jwt.ParseFromRequest(r, func(token *jwt.Token) (interface{}, error) {
if _, ok := token.Method.(*jwt.SigningMethodRSA); !ok {
return nil, fmt.Errorf("Unexpected signing method: %v", token.Header["alg"])
}
return authBackend.PublicKey, nil
})
if err != nil || !token.Valid {
w.WriteHeader(http.StatusUnauthorized)
return
}
h.handler.ServeHTTP(w, r)
}