chore: move api to route package

server/route/auth/auth.go

@@ -0,0 +1,64 @@
+package auth
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/golang-jwt/jwt/v4"
+)
+
+const (
+	// issuer is the issuer of the jwt token.
+	Issuer = "slash"
+	// Signing key section. For now, this is only used for signing, not for verifying since we only
+	// have 1 version. But it will be used to maintain backward compatibility if we change the signing mechanism.
+	KeyID = "v1"
+	// AccessTokenAudienceName is the audience name of the access token.
+	AccessTokenAudienceName = "user.access-token"
+	AccessTokenDuration     = 7 * 24 * time.Hour
+
+	// CookieExpDuration expires slightly earlier than the jwt expiration. Client would be logged out if the user
+	// cookie expires, thus the client would always logout first before attempting to make a request with the expired jwt.
+	CookieExpDuration = AccessTokenDuration - 1*time.Minute
+	// AccessTokenCookieName is the cookie name of access token.
+	AccessTokenCookieName = "slash.access-token"
+)
+
+type ClaimsMessage struct {
+	Name string `json:"name"`
+	jwt.RegisteredClaims
+}
+
+// GenerateAccessToken generates an access token.
+// username is the email of the user.
+func GenerateAccessToken(username string, userID int32, expirationTime time.Time, secret []byte) (string, error) {
+	return generateToken(username, userID, AccessTokenAudienceName, expirationTime, secret)
+}
+
+// generateToken generates a jwt token.
+func generateToken(username string, userID int32, audience string, expirationTime time.Time, secret []byte) (string, error) {
+	registeredClaims := jwt.RegisteredClaims{
+		Issuer:   Issuer,
+		Audience: jwt.ClaimStrings{audience},
+		IssuedAt: jwt.NewNumericDate(time.Now()),
+		Subject:  fmt.Sprint(userID),
+	}
+	if !expirationTime.IsZero() {
+		registeredClaims.ExpiresAt = jwt.NewNumericDate(expirationTime)
+	}
+
+	// Declare the token with the HS256 algorithm used for signing, and the claims.
+	token := jwt.NewWithClaims(jwt.SigningMethodHS256, &ClaimsMessage{
+		Name:             username,
+		RegisteredClaims: registeredClaims,
+	})
+	token.Header["kid"] = KeyID
+
+	// Create the JWT string.
+	tokenString, err := token.SignedString(secret)
+	if err != nil {
+		return "", err
+	}
+
+	return tokenString, nil
+}