feat: add aliyun captcha (#833)

* feat: add aliyun captcha provider

* Rename App key

* fix typo

* Rename HMACSHA1 & Reused clientId2 and clientSecret2

* Update ProviderEditPage.js

* Delete unused import

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

captcha/aliyun.go

@@ -0,0 +1,105 @@
+// Copyright 2022 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 captcha
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"net/url"
+	"sort"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/casdoor/casdoor/util"
+)
+
+const AliyunCaptchaVerifyUrl = "http://afs.aliyuncs.com"
+
+type AliyunCaptchaProvider struct {
+}
+
+func NewAliyunCaptchaProvider() *AliyunCaptchaProvider {
+	captcha := &AliyunCaptchaProvider{}
+	return captcha
+}
+
+func contentEscape(str string) string {
+	str = strings.Replace(str, " ", "%20", -1)
+	str = url.QueryEscape(str)
+	return str
+}
+
+func (captcha *AliyunCaptchaProvider) VerifyCaptcha(token, clientSecret string) (bool, error) {
+	pathData, err := url.ParseQuery(token)
+	if err != nil {
+		return false, err
+	}
+
+	pathData["Action"] = []string{"AuthenticateSig"}
+	pathData["Format"] = []string{"json"}
+	pathData["SignatureMethod"] = []string{"HMAC-SHA1"}
+	pathData["SignatureNonce"] = []string{strconv.FormatInt(time.Now().UnixNano(), 10)}
+	pathData["SignatureVersion"] = []string{"1.0"}
+	pathData["Timestamp"] = []string{time.Now().UTC().Format("2006-01-02T15:04:05Z")}
+	pathData["Version"] = []string{"2018-01-12"}
+
+	var keys []string
+	for k := range pathData {
+		keys = append(keys, k)
+	}
+	sort.Strings(keys)
+
+	sortQuery := ""
+	for _, k := range keys {
+		sortQuery += k + "=" + contentEscape(pathData[k][0]) + "&"
+	}
+	sortQuery = strings.TrimSuffix(sortQuery, "&")
+
+	stringToSign := fmt.Sprintf("GET&%s&%s", url.QueryEscape("/"), url.QueryEscape(sortQuery))
+
+	signature := util.GetHmacSha1(clientSecret+"&", stringToSign)
+
+	resp, err := http.Get(fmt.Sprintf("%s?%s&Signature=%s", AliyunCaptchaVerifyUrl, sortQuery, url.QueryEscape(signature)))
+	if err != nil {
+		return false, err
+	}
+
+	defer resp.Body.Close()
+	body, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return false, err
+	}
+
+	type captchaResponse struct {
+		Code int    `json:"Code"`
+		Msg  string `json:"Msg"`
+	}
+	captchaResp := &captchaResponse{}
+
+	err = json.Unmarshal(body, captchaResp)
+	if err != nil {
+		return false, err
+	}
+
+	if captchaResp.Code != 100 {
+		return false, errors.New(captchaResp.Msg)
+	}
+
+	return true, nil
+}