verify config.Proxy during startup

[WindzCUHK]

effect

prevent the proxy get in fatal error during runtime

authorization-proxy/handler/handler.go

Lines 49 to 59 in 6c6a4ee

	Director: func(r *http.Request) {
	u := *r.URL
	u.Scheme = scheme
	u.Host = host
	req, err := http.NewRequest(r.Method, u.String(), r.Body)
	if err != nil {
	glg.Fatal(errors.Wrap(err, "NewRequest returned error"))
	}
	req.Header = r.Header
	*r = *req
	},

fix

return error if config.Proxy contains invalid values during startup, e.g.

1. scheme != 'http' || scheme != 'https'
2. host ~ '@'

authorization-proxy/usecase/authz_proxyd.go

Lines 47 to 66 in 6c6a4ee

	// New returns a Authorization Proxy daemon, or error occurred.
	// The daemon contains a token service authentication and authorization server.
	// This function will also initialize the mapping rules for the authentication and authorization check.
	func New(cfg config.Config) (AuthzProxyDaemon, error) {
	athenz, err := newAuthzD(cfg)
	if err != nil {
	return nil, errors.Wrap(err, "cannot newAuthzD(cfg)")
	}
	debugMux := router.NewDebugRouter(cfg.Server, athenz)
	return &authzProxyDaemon{
	cfg: cfg,
	athenz: athenz,
	server: service.NewServer(
	service.WithServerConfig(cfg.Server),
	service.WithServerHandler(handler.New(cfg.Proxy, infra.NewBuffer(cfg.Proxy.BufferSize), athenz)),
	service.WithDebugHandler(debugMux)),
	}, nil
	}

[WindzCUHK]

continue in: AthenZ/authorization-proxy#11