feat: support webauthn (#407)

* feat: support webauthn

* Update init.go

* Update user_webauthn.go

* Update UserEditPage.js

* Update WebauthnCredentialTable.js

* Update LoginPage.js

Co-authored-by: Gucheng <85475922+nomeguy@users.noreply.github.com>

object/user_webauthn.go

@@ -0,0 +1,102 @@
+// Copyright 2022 The casbin Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package object
+
+import (
+	"encoding/base64"
+	"net/url"
+	"strings"
+
+	"github.com/astaxie/beego"
+	"github.com/duo-labs/webauthn/protocol"
+	"github.com/duo-labs/webauthn/webauthn"
+)
+
+func GetWebAuthnObject(host string) *webauthn.WebAuthn {
+	var err error
+
+	origin := beego.AppConfig.String("origin")
+	if origin == "" {
+		_, origin = getOriginFromHost(host)
+	}
+
+	localUrl, err := url.Parse(origin)
+	if err != nil {
+		panic("error when parsing origin:" + err.Error())
+	}
+
+	webAuthn, err := webauthn.New(&webauthn.Config{
+		RPDisplayName: beego.AppConfig.String("appname"),    // Display Name for your site
+		RPID:          strings.Split(localUrl.Host, ":")[0], // Generally the domain name for your site, it's ok because splits cannot return empty array
+		RPOrigin:      origin,                               // The origin URL for WebAuthn requests
+		// RPIcon:     "https://duo.com/logo.png",           // Optional icon URL for your site
+	})
+	if err != nil {
+		panic(err)
+	}
+
+	return webAuthn
+}
+
+// implementation of webauthn.User interface
+func (u *User) WebAuthnID() []byte {
+	return []byte(u.GetId())
+}
+
+func (u *User) WebAuthnName() string {
+	return u.Name
+}
+
+func (u *User) WebAuthnDisplayName() string {
+	return u.DisplayName
+}
+
+func (u *User) WebAuthnCredentials() []webauthn.Credential {
+	return u.WebauthnCredentials
+}
+
+func (u *User) WebAuthnIcon() string {
+	return u.Avatar
+}
+
+// CredentialExcludeList returns a CredentialDescriptor array filled with all the user's credentials
+func (u *User) CredentialExcludeList() []protocol.CredentialDescriptor {
+	credentials := u.WebAuthnCredentials()
+	credentialExcludeList := []protocol.CredentialDescriptor{}
+	for _, cred := range credentials {
+		descriptor := protocol.CredentialDescriptor{
+			Type:         protocol.PublicKeyCredentialType,
+			CredentialID: cred.ID,
+		}
+		credentialExcludeList = append(credentialExcludeList, descriptor)
+	}
+
+	return credentialExcludeList
+}
+
+func (u *User) AddCredentials(credential webauthn.Credential, isGlobalAdmin bool) bool {
+	u.WebauthnCredentials = append(u.WebauthnCredentials, credential)
+	return UpdateUser(u.GetId(), u, []string{"webauthnCredentials"}, isGlobalAdmin)
+}
+
+func (u *User) DeleteCredentials(credentialIdBase64 string) bool {
+	for i, credential := range u.WebauthnCredentials {
+		if base64.StdEncoding.EncodeToString(credential.ID) == credentialIdBase64 {
+			u.WebauthnCredentials = append(u.WebauthnCredentials[0:i], u.WebauthnCredentials[i+1:]...)
+			return UpdateUserForAllFields(u.GetId(), u)
+		}
+	}
+	return false
+}