feat: add initial implementation of Go utilities and CI workflows

Yubikey/otp.go

@@ -0,0 +1,114 @@
+package Yubikey
+
+import (
+	"errors"
+	"fmt"
+	"log"
+	"math/rand"
+	"net/http"
+	"strconv"
+	"strings"
+	"time"
+)
+
+type Response struct {
+	h              string
+	t              time.Time
+	otp            string
+	presentedNonce string
+	nonce          string
+	sl             uint8
+	timestamp      uint32
+	sessionCounter uint32
+	sessionUse     uint32
+	status         string
+}
+
+const keyLen = 40
+
+func (response *Response) Time() time.Time {
+	return response.t
+}
+
+func (response *Response) TimeStamp() uint32 {
+	return response.timestamp
+}
+
+func (response *Response) Valid() bool {
+	return response.status == "OK" && response.nonce == response.presentedNonce
+}
+
+//goland:noinspection GoUnusedExportedFunction // library function
+func GetVerification(otp string, clientId string) (*Response, error) {
+	nonce := randSeq(keyLen)
+
+	url := fmt.Sprintf(
+		"https://api.yubico.com/wsapi/2.0/verify?id=%s&otp=%s&timestamp=1&nonce=%s",
+		clientId,
+		otp,
+		nonce,
+	)
+
+	response, _ := http.Get(url)
+
+	defer func() {
+		_ = response.Body.Close()
+	}()
+
+	body := make([]byte, response.ContentLength)
+	_, err := response.Body.Read(body)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	parts := strings.Split(string(body), "\r\n")
+
+	var status string
+	for k, part := range parts {
+		if strings.Contains(part, "status=") {
+			status = strings.Replace(parts[k], "status=", "", 1)
+			break
+		}
+	}
+
+	if status != "OK" {
+		return nil, errors.New("invalid response status: " + status)
+	}
+
+	timeString := strings.Replace(parts[1], "t=", "", 1)[0:20]
+
+	signedTime, err := time.Parse(time.RFC3339, timeString)
+	if err != nil {
+		println(err)
+	}
+
+	sl, _ := strconv.ParseInt(strings.Replace(parts[4], "sl=", "", 1), 10, 8)
+	timestamp, _ := strconv.ParseInt(strings.Replace(parts[5], "timestamp=", "", 1), 10, 32)
+	sessionCounter, _ := strconv.ParseInt(strings.Replace(parts[6], "sessioncounter=", "", 1), 10, 32)
+	sessionUse, _ := strconv.ParseInt(strings.Replace(parts[7], "sessionuse=", "", 1), 10, 32)
+
+	keyResponse := Response{
+		h:              strings.Replace(parts[0], "h=", "", 1),
+		t:              signedTime,
+		otp:            strings.Replace(parts[2], "otp=", "", 1),
+		presentedNonce: nonce,
+		nonce:          strings.Replace(parts[3], "nonce=", "", 1),
+		sl:             uint8(sl),
+		timestamp:      uint32(timestamp),
+		sessionCounter: uint32(sessionCounter),
+		sessionUse:     uint32(sessionUse),
+		status:         status,
+	}
+
+	return &keyResponse, nil
+}
+
+func randSeq(n int) string {
+	var letters = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
+
+	b := make([]rune, n)
+	for i := range b {
+		b[i] = letters[rand.Intn(len(letters))]
+	}
+	return string(b)
+}