Go language demo

1package main 2 3import ( 4 "crypto/hmac" 5 "crypto/sha256" 6 "encoding/hex" 7 "fmt" 8 "time" 9) 10 11func sha256hex(s string) string { 12 b := sha256.Sum256([]byte(s)) 13 return hex.EncodeToString(b[:]) 14} 15 16func hmacsha256(s, key string) string { 17 hashed := hmac.New(sha256.New, []byte(key)) 18 hashed.Write([]byte(s)) 19 return string(hashed.Sum(nil)) 20} 21 22func main() { 23 accessKey := "AKIDz8krbsJ5yKBZQpn74WFkmLPx3*******" 24 secretKey := "Gu5t9xGARNpq86cd98joQYCN3*******" 25 host := "api-testing.klavi.ai" 26 algorithm := "K1-HMAC-SHA256" 27 service := "cbms" 28 29 region := "ap-brazil" 30 var timestamp int64 = time.Now().Unix() 31 32 // step 1: build canonical request string 33 // httpRequestMethod := "POST" 34 // canonicalURI := "/" 35 httpRequestMethod := "GET" 36 canonicalURI := "/link/external/v3/getInstitutionList" 37 canonicalQueryString := "" 38 // canonicalHeaders := "content-type:application/json; charset=utf-8\n" + "host:" + host + "\n" 39 canonicalHeaders := "content-type:application/x-www-form-urlencoded\n" + "host:" + host + "\n" 40 signedHeaders := "content-type;host" 41 payload := "" 42 hashedRequestPayload := sha256hex(payload) 43 canonicalRequest := fmt.Sprintf("%s\n%s\n%s\n%s\n%s\n%s", 44 httpRequestMethod, 45 canonicalURI, 46 canonicalQueryString, 47 canonicalHeaders, 48 signedHeaders, 49 hashedRequestPayload) 50 fmt.Printf("canonicalRequest: %s\n\n",canonicalRequest) 51 52 // step 2: build string to sign 53 date := time.Unix(timestamp, 0).UTC().Format("2006-01-02") 54 credentialScope := fmt.Sprintf("%s/%s/k1_request", date, service) 55 hashedCanonicalRequest := sha256hex(canonicalRequest) 56 string2sign := fmt.Sprintf("%s\n%d\n%s\n%s", 57 algorithm, 58 timestamp, 59 credentialScope, 60 hashedCanonicalRequest) 61 fmt.Printf("string2sign: %s\n",string2sign) 62 63 // step 3: sign string 64 secretDate := hmacsha256(date, "K1"+secretKey) 65 secretService := hmacsha256(service, secretDate) 66 secretSigning := hmacsha256("k1_request", secretService) 67 signature := hex.EncodeToString([]byte(hmacsha256(string2sign, secretSigning))) 68 fmt.Printf("signature: %s\n\n",signature) 69 70 // step 4: build authorization 71 authorization := fmt.Sprintf("%s Credential=%s/%s, SignedHeaders=%s, Signature=%s", 72 algorithm, 73 accessKey, 74 credentialScope, 75 signedHeaders, 76 signature) 77 fmt.Printf("authorization: %s\n\n",authorization) 78 79 // GET 80 getCurl := fmt.Sprintf(`curl -s -L -X GET http://%s%s \ 81 -H 'Authorization: %s'\ 82 -H 'Content-type: application/x-www-form-urlencoded' \ 83 -H 'Host: %s'\ 84 -H 'X-Timestamp: %d' \ 85 -H 'X-Region: %s'`,host,canonicalURI,authorization,host,timestamp,region) 86 fmt.Println(getCurl) 87 88 // POST 89 //postCurl := fmt.Sprintf(`curl -X POST https://%s\ 90 //-H "Authorization: %s"\ 91 //-H "Content-Type: application/json; charset=utf-8"\ 92 //-H "Host: %s"\ 93 //-H "X-Timestamp: %d"\ 94 //-H "X-Region: %s"\ 95 //-d '%s'`, host, authorization, host, timestamp, region, payload) 96 //fmt.Println(postCurl) 97}