chore: Adds user creation route.

backend/api/jwtcore/jwt.go

@@ -0,0 +1,59 @@
+package jwtcore
+
+import (
+	"encoding/base64"
+	"fmt"
+	"os"
+	"strconv"
+	"time"
+
+	"github.com/golang-jwt/jwt/v5"
+)
+
+var JWTKey []byte
+
+func SetupJWT() error {
+	var err error
+	jwtDataString := os.Getenv("HERMES_JWT_SECRET")
+
+	if jwtDataString == "" {
+		return fmt.Errorf("JWT secret isn't set (missing HERMES_JWT_SECRET)")
+	}
+
+	if os.Getenv("HERMES_JWT_BASE64_ENCODED") != "" {
+		JWTKey, err = base64.StdEncoding.DecodeString(jwtDataString)
+
+		if err != nil {
+			return fmt.Errorf("failed to decode base64 JWT: %s", err.Error())
+		}
+	} else {
+		JWTKey = []byte(jwtDataString)
+	}
+
+	return nil
+}
+
+func Parse(tokenString string, options ...jwt.ParserOption) (*jwt.Token, error) {
+	return jwt.Parse(tokenString, JWTKeyCallback, options...)
+}
+
+func Generate(uid uint) (string, error) {
+	token := jwt.NewWithClaims(jwt.SigningMethodHS256, jwt.RegisteredClaims{
+		ExpiresAt: jwt.NewNumericDate(time.Now().Add(3 * time.Minute)),
+		IssuedAt:  jwt.NewNumericDate(time.Now()),
+		NotBefore: jwt.NewNumericDate(time.Now()),
+		Audience:  []string{strconv.Itoa(int(uid))},
+	})
+
+	signedToken, err := token.SignedString(JWTKey)
+
+	if err != nil {
+		return "", err
+	}
+
+	return signedToken, nil
+}
+
+func JWTKeyCallback(*jwt.Token) (interface{}, error) {
+	return JWTKey, nil
+}