func (responding *challengeSimpleHttpResponding) InitializeResponse(UI ui.UserInterface) error {
	tls, err := UI.YesNoDialog("", "", "Use TLS for simple http(s) domain name verification?", true)
	if nil != err {
		return err
	}
	responding.data.TLS = tls
	return nil
}

func (responding *challengeSimpleHttpResponding) ShowInstructions(UI ui.UserInterface) error {
	if file, err := responding.createVerificationFile(); nil != err {
		return err
	} else if _, err := UI.Prompt(fmt.Sprintf(
		"Make the text on the next line available (without quotes) as %s\n%v\nPress enter when done",
		responding.WellKnownURL(), file)); nil != err {
		return err
	}
	return nil
}

func (responding *challengeDVSNIResponding) ShowInstructions(UI ui.UserInterface) error {
	text := fmt.Sprintf("%s:443 needs to present a (self-signed) certificate for SNI name (\"vhost\") %s\n", responding.dnsIdentifier, responding.subjectAltName())
	if cert, err := responding.makeCertificate(); nil != err {
		text += fmt.Sprintf("Couldn't generate example certificate (build your own instead): %s\n", err)
	} else {
		text += fmt.Sprintf("You can use the following 2048-bit RSA certificate:\n%s", cert)
	}
	text += "Press enter when done"
	_, err := UI.Prompt(text)
	return err
}

func Run(UI ui.UserInterface, args []string) {
	register_flags.Parse(args)

	if 1 != len(register_flags.Args()) {
		utils.Fatalf("Missing url of authorization to import")
	}
	url := register_flags.Arg(0)

	_, _, reg := command_base.OpenStorageFromFlags(UI)
	if nil == reg {
		utils.Fatalf("You need to register first")
	}

	auth, err := reg.ImportAuthorizationByURL(url, true)
	if nil != err {
		utils.Fatalf("Couldn't retrieve authorization: %s", err)
	}

	UI.Messagef("Imported authorization %v successfully: %#v", url, auth.Authorization())
}

func Open(UI ui.UserInterface, db *sql.DB) (i.Storage, error) {
	pwPrompt, lastPassword := UI.PasswordPromptOnce("Enter storage password")
	storage := &sqlStorage{
		db:             db,
		passwordPrompt: pwPrompt,
		lastPassword:   lastPassword,
	}
	if err := storage.checkDirectoryTable(); nil != err {
		return nil, err
	}
	if err := storage.checkRegistrationTable(); nil != err {
		return nil, err
	}
	if err := storage.checkAuthorizationTable(); nil != err {
		return nil, err
	}
	if err := storage.checkCertificateTable(); nil != err {
		return nil, err
	}

	return storage, nil
}

func EnterNewContact(UI ui.UserInterface) ([]string, error) {
	var fields = []string{
		"email address",
		"phone number",
	}
	var uris = []string{
		"mailto:",
		"tel:",
	}

	var contacts []string

	values, err := UI.FormInput("Enter contact data, leave fields empty to omit them", fields)
	if err != nil {
		return nil, err
	}
	for ndx, value := range values {
		if 0 != len(value) {
			contacts = append(contacts, uris[ndx]+value)
		}
	}

	return contacts, nil
}

func Run(UI ui.UserInterface, args []string) {
	register_flags.Parse(args)

	_, _, reg := command_base.OpenStorageFromFlags(UI)
	if nil == reg {
		utils.Fatalf("You need to register first")
	}

	if 0 == len(register_flags.Args()) {
		certs, err := reg.CertificateInfos()
		if nil != err {
			utils.Fatalf("Couldn't load certificate list: %s", err)
		}
		UI.Message("Certificate list")
		for _, certInfo := range certs {
			UI.Messagef("\t%s", certInfo.Location)
		}
	} else {
		location := register_flags.Arg(0)
		cert, err := reg.LoadCertificate(location)
		if nil != err {
			utils.Fatalf("Couldn't load certificate: %s", err)
		} else if nil == cert {
			utils.Fatalf("Couldn't find certificate")
		}
		certData := cert.Certificate()

		UI.Messagef("Certificate from %s (DER encoded)", location)
		if 0 != len(certData.LinkIssuer) {
			UI.Messagef("Issued by %s", certData.LinkIssuer)
		}
		UI.Messagef("%s", pem.EncodeToMemory(certData.Certificate))
		if nil != certData.PrivateKey {
			UI.Messagef("%s", pem.EncodeToMemory(certData.PrivateKey))
		}
	}
}

func Run(UI ui.UserInterface, args []string) {
	register_flags.Parse(args)

	_, _, reg := command_base.OpenStorageFromFlags(UI)
	if nil == reg {
		utils.Fatalf("You need to register first")
	}

	listValidAuths, err := reg.AuthorizationInfosWithStatus(types.AuthorizationStatus("valid"))
	if nil != err {
		utils.Fatalf("Couldn't list valid authorizations: %s", err)
	}

	validAuths := make(map[string]bool)
	var validDomains []string

	for dnsName, _ := range listValidAuths {
		validAuths[dnsName] = true
		validDomains = append(validDomains, dnsName)
	}

	if 0 == len(validDomains) {
		utils.Fatalf("You don't have any valid authorizations.")
	}

	var pkey interface{}
	privateKeyGenerated := false
	if 0 != len(register_flags.Args()) {
		pkeyPrompt, _ := UI.PasswordPromptOnce("Enter private key password")
		if pkeyFile, err := os.Open(register_flags.Arg(0)); nil != err {
			utils.Fatalf("%s", err)
		} else if pkey, err = utils.LoadFirstPrivateKey(pkeyFile, pkeyPrompt); nil != err {
			utils.Fatalf("%s", err)
		}
	} else {
		UI.Message("Generating private key for certificate")
		privateKeyGenerated = true
		var err error
		if pkey, err = utils.CreatePrivateKey(keyType, curve, &rsabits); nil != err {
			utils.Fatalf("Couldn't create private key for certificate: %s", err)
		}
	}

	UI.Messagef("Available domains: %v", validDomains)

	markSelectedDomains := make(map[string]bool)
	var selectedDomains []string
	for {
		domain, err := UI.Prompt("Enter domain to add to certificate (empty to end list)")
		if err != nil {
			utils.Fatalf("Couldn't read domain: %s", err)
		}
		if 0 == len(domain) {
			break
		}
		if markSelectedDomains[domain] {
			UI.Messagef("Already selected %#v", domain)
			continue
		}
		markSelectedDomains[domain] = true
		if !validAuths[domain] {
			UI.Messagef("Unknown domain %#v, not adding - try again", domain)
			continue
		}
		selectedDomains = append(selectedDomains, domain)
	}

	if 0 == len(selectedDomains) {
		UI.Message("No domains entered, aborting")
		return
	}

	csr, err := utils.MakeCertificateRequest(utils.CertificateRequestParameters{
		PrivateKey: pkey,
		DNSNames:   selectedDomains,
	})
	if nil != err {
		utils.Fatalf("Couldn't create certificate request: %s", err)
	}

	utils.Debugf("CSR:\n%s", pem.EncodeToMemory(csr))

	cert, err := reg.NewCertificate(*csr)
	if nil != err {
		utils.Fatalf("Certificate request failed: %s", err)
	}

	if privateKeyGenerated {
		if err := cert.SetPrivateKey(pkey); nil != err {
			utils.Errorf("Couldn't store private key: %s", err)
		}
	}
	certData := cert.Certificate()

	UI.Messagef("New certificate is available under: %s (DER encoded)", certData.Location)
	if 0 != len(certData.LinkIssuer) {
		UI.Messagef("Issueing certificate available at: %s", certData.LinkIssuer)
	}
	UI.Messagef("%s", pem.EncodeToMemory(certData.Certificate))
	if nil != certData.PrivateKey {
//.........这里部分代码省略.........

func Run(UI ui.UserInterface, args []string) {
	register_flags.Parse(args)

	_, _, reg := command_base.OpenStorageFromFlags(UI)
	if nil == reg {
		utils.Fatalf("You need to register first")
	}

	if 1 != len(register_flags.Args()) {
		auths, err := reg.AuthorizationInfos()
		if nil != err {
			utils.Fatalf("Couldn't retrieve list of authorizations: %s", err)
		}
		msg := "The following authorizations are available:\n"
		for dnsName, auth := range auths {
			msg += fmt.Sprintf("\t%s\n", dnsName)
			for _, info := range auth {
				if info.Status == types.AuthorizationStatus("valid") && nil != info.Expires {
					msg += fmt.Sprintf("\t\t%s (%s till %s)\n", info.Location, info.Status, info.Expires)
				} else {
					msg += fmt.Sprintf("\t\t%s (%s)\n", info.Location, info.Status)
				}
			}
		}
		msg += "Provide the domain (or url) you want to work with as command line parameter"
		UI.Message(msg)
		return
	}
	locationOrDnsName := register_flags.Arg(0)

	auth, err := reg.LoadAuthorizationByURL(locationOrDnsName)
	if nil != err {
		utils.Fatalf("Couldn't load authorization %v: %v", locationOrDnsName, err)
	} else if nil != auth {
		if err := auth.Refresh(); nil != err {
			utils.Fatalf("Couldn't refresh authorization %v: %v", locationOrDnsName, err)
		}
	} else {
		if auth, err = reg.AuthorizeDNS(locationOrDnsName); nil != err {
			utils.Fatalf("Couldn't get authorization for %v: %s", locationOrDnsName, err)
		}
	}

	for {
		// refresh every round
		authData := auth.Authorization()

		msg := fmt.Sprintf("Status: %s\n", authData.Resource.Status)
		if string(authData.Resource.Status) == "valid" {
			msg += fmt.Sprintf("Expires: %s\n", authData.Resource.Expires)
		}
		for ndx, challenge := range authData.Resource.Challenges {
			if 0 != len(challenge.GetValidated()) {
				msg += fmt.Sprintf("Challenge: %d (%s, %s, validated on %s)\n", ndx, challenge.GetType(), challenge.GetStatus(), challenge.GetValidated())
			} else {
				msg += fmt.Sprintf("Challenge: %d (%s, %s)\n", ndx, challenge.GetType(), challenge.GetStatus())
			}
		}
		msg += fmt.Sprintf("Valid combinations: %v", authData.Resource.Combinations)
		UI.Message(msg)

		if 0 != len(authData.Resource.Status) {
			UI.Message("Authorization finished")
			return
		}

		sel, err := UI.Prompt("Enter a challenge number to respond to (or r for refresh and empty string to exit)")
		if nil != err {
			utils.Fatalf("Failed reading challenge number: %s", err)
		}
		if 0 == len(sel) {
			break
		}
		if sel != "r" {
			selCh, err := strconv.Atoi(sel)
			if nil != err {
				UI.Messagef("Invalid input (%s), try again", err)
				continue
			}
			if selCh < 0 || selCh >= len(authData.Resource.Challenges) {
				UI.Messagef("Not a valid challenge index, try again", err)
				continue
			}

			chResp, err := authData.Respond(reg.Registration(), selCh)
			if nil != err {
				utils.Fatalf("Error trying to create response: %s", err)
			}
			if nil == chResp {
				UI.Messagef("Responding for challenge %d not supported", selCh)
				continue
			}

			if err = chResp.InitializeResponse(UI); nil != err {
				UI.Messagef("Failed to initialize response: %s", err)
			}

			if err = chResp.ShowInstructions(UI); nil != err {
				UI.Messagef("Failed to complete challenge: %s", err)
				continue
//.........这里部分代码省略.........

func Run(UI ui.UserInterface, args []string) {
	register_flags.Parse(args)

	st, controller, reg := command_base.OpenStorageFromFlags(UI)

	var newContact []string
	var newAgreementURL *string

	if nil != reg {
		if !no_refresh {
			UI.Message("Using existing registration")

			if err := reg.Refresh(); nil != err {
				utils.Errorf("Couldn't refresh the registration: %s", err)
			}
		}

		if modify {
			var err error
			if newContact, err = EnterNewContact(UI); nil != err {
				utils.Fatalf("Couldn't get new contact information: %s", err)
			}
			if reflect.DeepEqual(newContact, reg.Registration().Resource.Contact) {
				UI.Messagef("Entered contact information is the same we already have, ignoring update")
				newContact = nil // no changes
			}
		}
	} else {
		UI.Message("Creating new registration")

		dir, err := controller.GetDirectory(demoDirectoryURL, false)
		if nil != err {
			utils.Fatalf("Couldn't fetch directory for '%s': %s", demoDirectoryURL, err)
		}

		UI.Message("Generating private key, might take some time")
		signingKey, err := types.CreateSigningKey(keyType, curve, &rsabits)
		if nil != err {
			utils.Fatalf("Couldn't create private key for registration: %s", err)
		}
		contact, err := EnterNewContact(UI)
		if nil != err {
			utils.Fatalf("Couldn't get contact information for registration: %s", err)
		}

		if password, err := UI.NewPasswordPrompt("Enter new password for account", "Enter password again"); nil != err {
			utils.Fatalf("Couldn't read new password for storage file: %s", err)
		} else {
			st.SetPassword(password)
		}

		if reg, err = dir.NewRegistration(command_base.FlagsStorageRegistrationName, signingKey, contact); nil != err {
			utils.Fatalf("Couldn't create registration: %s", err)
		}
	}

	regData := reg.Registration()

	if 0 != len(regData.LinkTermsOfService) && (show_tos || 0 == len(regData.Resource.AgreementURL)) {
		if regData.Resource.AgreementURL == regData.LinkTermsOfService {
			UI.Messagef("The terms of service at %s are marked as already agreed to.", regData.LinkTermsOfService)
		} else if agree_tos {
			UI.Messagef("Automatically accepting the terms of service at %s as requested:", regData.LinkTermsOfService)
			newAgreementURL = &regData.LinkTermsOfService
		} else {
			var title string
			if 0 == len(regData.Resource.AgreementURL) {
				title = "The server asks for confirmation of the terms of service at %s"
			} else {
				title = "There are new terms of service at %s"
			}
			ack, err := UI.YesNoDialog(fmt.Sprintf(title, regData.LinkTermsOfService), "", "Agree?", false)
			if err != nil {
				utils.Fatalf("Couldn't read acknowledge for terms of service: %s", err)
			}
			if ack {
				newAgreementURL = &regData.LinkTermsOfService
			} else if 0 == len(regData.Resource.AgreementURL) {
				utils.Infof("Terms of service not accepted")
			} else {
				utils.Infof("New terms of service not accepted")
			}
		}
	}

	if err := reg.Update(newContact, newAgreementURL); err != nil {
		utils.Fatalf("Couldn't update registration: %s", err)
	}
	regData = reg.Registration()

	UI.Messagef("Your registration URL is %s", regData.Location)
	UI.Messagef("Your registered contact information is: %v", regData.Resource.Contact)
	if 0 != len(regData.Resource.AgreementURL) {
		UI.Messagef("You agreed to the terms of service at %s", regData.Resource.AgreementURL)
	} else {
		UI.Messagef("You didn't agree to the terms of service at %s", regData.LinkTermsOfService)
	}
	UI.Messagef("Your recovery token is: %s", regData.RecoveryToken)
}