Authentication: Implements authentication

model/authtoken.go

@@ -0,0 +1,59 @@
+package model
+
+import (
+	"encoding/base64"
+	"log"
+	"time"
+
+	"github.com/dgrijalva/jwt-go"
+)
+
+type AuthToken struct {
+	SignedToken string `json:"jwt"`
+	token       jwt.Token
+}
+
+type TokenGenerationError struct {
+	message string
+}
+
+func (e *TokenGenerationError) Error() string {
+	return e.message
+}
+
+// Create a struct to hold your custom claims
+type customClaims struct {
+	Username string `json:"username"`
+	jwt.StandardClaims
+}
+
+const signingKey = "nDjYmTjoPrAGzuyhHz6Dq5bqcRrEZJc5Ls3SQcdylBI="
+
+func NewAuthToken(username string) (*AuthToken, error) {
+	claims := customClaims{
+		Username: username,
+		StandardClaims: jwt.StandardClaims{
+			ExpiresAt: time.Now().Add(time.Hour * 24 * 5).Unix(), // 5 days
+		},
+	}
+
+	// Create a new JWT token
+	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
+	if token == nil {
+		log.Printf("Error creating Jwt Token")
+		return nil, &TokenGenerationError{"Error creating Jwt Token"}
+	}
+
+	// Sign the token with the specified signing key
+	decodedSigningKey, _ := base64.StdEncoding.DecodeString(signingKey)
+	signedToken, err := token.SignedString(decodedSigningKey)
+	if err != nil {
+		log.Printf("Error signing Jwt Token: %s", err)
+		return nil, &TokenGenerationError{"Error signing Jwt Token"}
+	}
+
+	return &AuthToken{
+		SignedToken: signedToken,
+		token:       *token,
+	}, nil
+}