Add kyc tool library

Signed-off-by: Asai Neko <sugar@sne.moe>

internal/kyc/cnrid.go

@@ -0,0 +1,120 @@
+package kyc
+
+import (
+	"crypto/md5"
+	"encoding/hex"
+	"fmt"
+	"unicode/utf8"
+
+	alicloudauth20190307 "github.com/alibabacloud-go/cloudauth-20190307/v4/client"
+	aliopenapi "github.com/alibabacloud-go/darabonba-openapi/v2/client"
+	aliutil "github.com/alibabacloud-go/tea-utils/v2/service"
+	alitea "github.com/alibabacloud-go/tea/tea"
+	alicredential "github.com/aliyun/credentials-go/credentials"
+	"github.com/spf13/viper"
+)
+
+func CNRidMD5AliEnc(kyc *KycInfo) (*AliCloudAuth, error) {
+	if kyc.Type != "Chinese" {
+		return nil, nil
+	}
+
+	// MD5 Legal Name rule: First Chinese char md5enc, remaining plain, at least 2 Chinese chars
+	if len(kyc.CNRidInfo.LegalName) < 2 || utf8.RuneCountInString(kyc.CNRidInfo.LegalName) < 2 {
+		return nil, fmt.Errorf("input string must have at least 2 Chinese characters")
+	}
+
+	lnFirstRune, size := utf8.DecodeRuneInString(kyc.CNRidInfo.LegalName)
+	if lnFirstRune == utf8.RuneError {
+		return nil, fmt.Errorf("invalid first character")
+	}
+
+	lnHash := md5.New()
+	lnHash.Write([]byte(string(lnFirstRune)))
+	lnFirstHash := hex.EncodeToString(lnHash.Sum(nil))
+
+	lnRemaining := kyc.CNRidInfo.LegalName[size:]
+
+	ln := lnFirstHash + lnRemaining
+
+	// MD5 Resident Id rule: First 6 char plain, middle birthdate md5enc, last 4 char plain, at least 18 chars
+	if len(kyc.CNRidInfo.ResidentId) < 18 {
+		return nil, fmt.Errorf("input string must have at least 18 characters")
+	}
+
+	ridPrefix := kyc.CNRidInfo.ResidentId[:6]
+	ridSuffix := kyc.CNRidInfo.ResidentId[len(kyc.CNRidInfo.ResidentId)-4:]
+	ridMiddle := kyc.CNRidInfo.ResidentId[6 : len(kyc.CNRidInfo.ResidentId)-4]
+
+	ridHash := md5.New()
+	ridHash.Write([]byte(ridMiddle))
+	ridMiddleHash := hex.EncodeToString(ridHash.Sum(nil))
+
+	rid := ridPrefix + ridMiddleHash + ridSuffix
+
+	// Aliyun Id2MetaVerify API Params
+	var kycAli AliCloudAuth
+	kycAli.ParamType = "md5"
+	kycAli.UserName = ln
+	kycAli.IdentifyNum = rid
+
+	return &kycAli, nil
+}
+
+func AliId2MetaVerify(kycAli *AliCloudAuth) (*string, error) {
+	// Create aliyun openapi credential
+	credentialConfig := new(alicredential.Config).
+		SetType("access_key").
+		SetAccessKeyId(viper.GetString("kyc.ali_access_key_id")).
+		SetAccessKeySecret(viper.GetString("kyc.ali_access_key_secret"))
+	credential, err := alicredential.NewCredential(credentialConfig)
+	if err != nil {
+		return nil, err
+	}
+
+	// Create aliyun cloudauth client
+	config := &aliopenapi.Config{
+		Credential: credential,
+	}
+	config.Endpoint = alitea.String("cloudauth.aliyuncs.com")
+	client := &alicloudauth20190307.Client{}
+	client, err = alicloudauth20190307.NewClient(config)
+	if err != nil {
+		return nil, err
+	}
+
+	// Create Id2MetaVerify request
+	id2MetaVerifyRequest := &alicloudauth20190307.Id2MetaVerifyRequest{
+		ParamType:   &kycAli.ParamType,
+		UserName:    &kycAli.UserName,
+		IdentifyNum: &kycAli.IdentifyNum,
+	}
+
+	// Create client runtime request
+	runtime := &aliutil.RuntimeOptions{}
+	resp, tryErr := func() (*alicloudauth20190307.Id2MetaVerifyResponse, error) {
+		defer func() {
+			if r := alitea.Recover(recover()); r != nil {
+				err = r
+			}
+		}()
+		resp, err := client.Id2MetaVerifyWithOptions(id2MetaVerifyRequest, runtime)
+		if err != nil {
+			return nil, err
+		}
+		return resp, nil
+	}()
+
+	// Try error handler ??? from ali generated sdk
+	if tryErr != nil {
+		var error = &alitea.SDKError{}
+		if t, ok := tryErr.(*alitea.SDKError); ok {
+			error = t
+		} else {
+			error.Message = alitea.String(tryErr.Error())
+		}
+		return nil, error
+	}
+
+	return resp.Body.ResultObject.BizCode, err
+}