feat: support MetaMask provider (#2084)

* feat: add metamask provider

* feat: add eth login

* feat: check eth sign

* feat: finish metamask signin/signup

* feat: support MetaMask provider link/unlink

* feat: update web/craco.config.js to handle polyfill

* feat: gofumpt idp/metamask.go

* feat: update MetaMask logo path

* feat: support MetaMask avatar

idp/metamask.go

@@ -0,0 +1,80 @@
+// Copyright 2023 The Casdoor 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 idp
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"net/http"
+	"time"
+
+	"golang.org/x/oauth2"
+)
+
+const Web3AuthTokenKey = "web3AuthToken"
+
+type MetaMaskIdProvider struct {
+	Client *http.Client
+}
+
+type Web3AuthToken struct {
+	Address   string `json:"address"`
+	Nonce     string `json:"nonce"`
+	CreateAt  uint64 `json:"createAt"`
+	TypedData string `json:"typedData"`
+	Signature string `json:"signature"` // signature for typed data
+}
+
+func NewMetaMaskIdProvider() *MetaMaskIdProvider {
+	idp := &MetaMaskIdProvider{}
+	return idp
+}
+
+func (idp *MetaMaskIdProvider) SetHttpClient(client *http.Client) {
+	idp.Client = client
+}
+
+func (idp *MetaMaskIdProvider) GetToken(code string) (*oauth2.Token, error) {
+	web3AuthToken := Web3AuthToken{}
+	if err := json.Unmarshal([]byte(code), &web3AuthToken); err != nil {
+		return nil, err
+	}
+	token := &oauth2.Token{
+		AccessToken: web3AuthToken.Signature,
+		TokenType:   "Bearer",
+		Expiry:      time.Now().AddDate(0, 1, 0),
+	}
+
+	token = token.WithExtra(map[string]interface{}{
+		Web3AuthTokenKey: web3AuthToken,
+	})
+	return token, nil
+}
+
+func (idp *MetaMaskIdProvider) GetUserInfo(token *oauth2.Token) (*UserInfo, error) {
+	// TODO use "github.com/ethereum/go-ethereum" to check address's eth balance or transaction
+	web3AuthToken, ok := token.Extra(Web3AuthTokenKey).(Web3AuthToken)
+	if !ok {
+		return nil, errors.New("invalid web3AuthToken")
+	}
+	userInfo := &UserInfo{
+		Id:          web3AuthToken.Address,
+		Username:    web3AuthToken.Address,
+		DisplayName: web3AuthToken.Address,
+		AvatarUrl:   fmt.Sprintf("metamask:%v", web3AuthToken.Address),
+	}
+	return userInfo, nil
+}