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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,73 @@ | ||
| package app | ||
|
|
||
| import ( | ||
| "context" | ||
| "errors" | ||
| "fmt" | ||
| "net/http" | ||
| "strings" | ||
|
|
||
| "github.com/dgrijalva/jwt-go" | ||
| "github.com/lestrrat-go/jwx/jwk" | ||
| ) | ||
|
|
||
| type AuthJWT struct { | ||
| JwksURL string | ||
| } | ||
|
|
||
| func (mw *AuthJWT) getKey(token *jwt.Token) (interface{}, error) { | ||
| set, err := jwk.Fetch(context.Background(), mw.JwksURL) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| keyID, ok := token.Header["kid"].(string) | ||
| if !ok { | ||
| return nil, errors.New("expecting JWT header to have string kid") | ||
| } | ||
|
|
||
| if key, ok := set.LookupKeyID(keyID); ok { | ||
| var keyRaw interface{} | ||
| if err := key.Raw(&keyRaw); err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return keyRaw, nil | ||
| } | ||
|
|
||
| return nil, fmt.Errorf("unable to find key %q", keyID) | ||
| } | ||
|
|
||
| func (mw *AuthJWT) Middleware(next http.Handler) http.Handler { | ||
| return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { | ||
| auth := strings.SplitN(r.Header.Get("authorization"), " ", 2) | ||
|
|
||
| if len(auth) != 2 || strings.ToLower(auth[0]) != "bearer" { | ||
| http.Error(w, "not authorized", http.StatusUnauthorized) | ||
| return | ||
| } | ||
|
|
||
| token, err := jwt.Parse(auth[1], mw.getKey) | ||
| if err != nil { | ||
| http.Error(w, fmt.Sprintf("authorization failed: %s", err), http.StatusUnauthorized) | ||
| return | ||
| } | ||
|
|
||
| if !token.Valid { | ||
| http.Error(w, "authorization failed: token is invalid", http.StatusUnauthorized) | ||
| return | ||
| } | ||
|
|
||
| claims := token.Claims.(jwt.MapClaims) | ||
|
|
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| if iss, ok := claims["iss"]; ok { | ||
| w.Header().Set("x-auth-iss", iss.(string)) | ||
| } | ||
|
|
||
| if jti, ok := claims["jti"]; ok { | ||
| w.Header().Set("x-auth-jti", jti.(string)) | ||
| } | ||
|
|
||
| next.ServeHTTP(w, r) | ||
| }) | ||
| } |
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