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package jwt |
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import ( |
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"context" |
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"strings" |
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"time" |
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"github.com/golang-jwt/jwt/v5" |
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"github.com/memnix/memnix-rest/pkg/utils" |
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"github.com/pkg/errors" |
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"golang.org/x/crypto/ed25519" |
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) |
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type Instance struct { |
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headerLen int |
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publicKey ed25519.PublicKey |
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privateKey ed25519.PrivateKey |
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signingMethod jwt.SigningMethod |
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ExpirationTimeInHours int |
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} |
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// NewJWTInstance return a new JwtInstance with the given parameters |
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func NewJWTInstance(headerLen, expirationTime int, publicKey ed25519.PublicKey, privateKey ed25519.PrivateKey) Instance { |
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return Instance{ |
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headerLen: headerLen, |
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publicKey: publicKey, |
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privateKey: privateKey, |
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signingMethod: jwt.SigningMethodEdDSA, |
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ExpirationTimeInHours: expirationTime, |
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} |
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} |
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// GenerateToken generates a jwt token from a user id |
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// and returns the token and an error |
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// |
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// It's signing method is defined in utils.JwtSigningMethod |
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// It's expiration time is defined in utils.GetExpirationTime |
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// It's secret key is defined in the environment variable SECRET_KEY |
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// see: utils/config.go for more information |
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func (instance Instance) GenerateToken(_ context.Context, userID uint) (string, error) { |
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// Create the Claims for the token |
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claims := jwt.NewWithClaims(instance.signingMethod, jwt.RegisteredClaims{ |
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Issuer: utils.ConvertUIntToStr(userID), // Issuer is the user id |
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ExpiresAt: instance.CalculateExpirationTime(), // ExpiresAt is the expiration time |
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}) |
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// Sign and get the complete encoded token as a string using the secret |
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token, err := claims.SignedString(instance.privateKey) |
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if err != nil { |
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return "", errors.Wrap(err, "failed to sign") |
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} |
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return token, nil |
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} |
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// VerifyToken verifies a jwt token |
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// and returns the user id and an error |
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func (Instance) VerifyToken(token *jwt.Token) (uint, error) { |
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// claims is of type jwt.MapClaims |
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if claims, ok := token.Claims.(jwt.MapClaims); token.Valid && ok { |
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// Get the issuer from the claims and convert it to uint |
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userID, err := utils.ConvertStrToUInt(claims["iss"].(string)) |
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if err != nil { |
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return 0, err |
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} |
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return userID, nil |
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} |
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return 0, errors.New("invalid token") |
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} |
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// GetToken gets a jwt.Token token from a string |
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// and returns the jwt.Token and an error |
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func (instance Instance) GetToken(_ context.Context, token string) (*jwt.Token, error) { |
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// Parse takes the token string and a function for looking up the key. |
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return jwt.Parse(token, func(token *jwt.Token) (interface{}, error) { |
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if _, ok := token.Method.(*jwt.SigningMethodEd25519); !ok { |
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return nil, errors.New("unexpected signing method") |
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} |
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return instance.publicKey, nil // Return the secret key as the signing key |
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}) |
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} |
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func (Instance) GetExpirationTime(token *jwt.Token) int64 { |
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claims := token.Claims.(jwt.MapClaims) |
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return int64(claims["exp"].(float64)) |
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} |
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// extractToken function to extract token from header |
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func (instance Instance) extractToken(token string) string { |
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// Normally Authorization HTTP header. |
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onlyToken := strings.Split(token, " ") // Split token |
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if len(onlyToken) == instance.headerLen { |
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return onlyToken[1] // Return only token |
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} |
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return "" // Return empty string |
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} |
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// GetConnectedUserID gets the user id from a jwt token |
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func (instance Instance) GetConnectedUserID(ctx context.Context, tokenHeader string) (uint, error) { |
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// Get the token from the Authorization header |
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tokenString := instance.extractToken(tokenHeader) |
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token, err := instance.GetToken(ctx, tokenString) |
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if err != nil { |
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return 0, err |
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} |
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// Check if the token is valid |
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userID, err := instance.VerifyToken(token) |
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if err != nil { |
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return 0, err |
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} |
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return userID, nil |
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} |
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// CalculateExpirationTime returns the expiration time |
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func (instance Instance) CalculateExpirationTime() *jwt.NumericDate { |
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return jwt.NewNumericDate(time.Now().Add(time.Hour * time.Duration(instance.ExpirationTimeInHours))) |
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} |
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memnix /
memnix-rest
