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Package jwt

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Published: May 23, 2020 | License: MIT | Module:



var (
	// ErrMissingRealm indicates Realm name is required
	ErrMissingRealm = errors.New("realm is missing")

	// ErrMissingSecretKey indicates Secret key is required
	ErrMissingSecretKey = errors.New("secret key is required")

	// ErrForbidden when HTTP status 403 is given
	ErrForbidden = errors.New("you don't have permission to access this resource")

	// ErrMissingAuthenticatorFunc indicates Authenticator is required
	ErrMissingAuthenticatorFunc = errors.New("ginJWTMiddleware.Authenticator func is undefined")

	// ErrMissingLoginValues indicates a user tried to authenticate without username or password
	ErrMissingLoginValues = errors.New("missing Username or Password")

	// ErrFailedAuthentication indicates authentication failed, could be faulty username or password
	ErrFailedAuthentication = errors.New("incorrect Username or Password")

	// ErrFailedTokenCreation indicates JWT Token failed to create, reason unknown
	ErrFailedTokenCreation = errors.New("failed to create JWT Token")

	// ErrExpiredToken indicates JWT token has expired. Can't refresh.
	ErrExpiredToken = errors.New("token is expired")

	// ErrEmptyAuthHeader can be thrown if authing with a HTTP header, the Auth header needs to be set
	ErrEmptyAuthHeader = errors.New("auth header is empty")

	// ErrInvalidAuthHeader indicates auth header is invalid, could for example have the wrong Realm name
	ErrInvalidAuthHeader = errors.New("auth header is invalid")

	// ErrEmptyQueryToken can be thrown if authing with URL Query, the query token variable is empty
	ErrEmptyQueryToken = errors.New("query token is empty")

	// ErrEmptyCookieToken can be thrown if authing with a cookie, the token cokie is empty
	ErrEmptyCookieToken = errors.New("cookie token is empty")

	// ErrInvalidSigningAlgorithm indicates signing algorithm is invalid, needs to be HS256, HS384, or HS512
	ErrInvalidSigningAlgorithm = errors.New("invalid signing algorithm")

func ExtractClaims

func ExtractClaims(c *gin.Context) jwt.MapClaims

ExtractClaims help to extract the JWT claims

type GinJWTMiddleware

type GinJWTMiddleware struct {
	// Realm name to display to the user. Required.
	Realm string

	// signing algorithm - possible values are HS256, HS384, HS512
	// Optional, default is HS256.
	SigningAlgorithm string

	// Secret key used for signing. Required.
	Key []byte

	// Duration that a jwt token is valid. Optional, defaults to one hour.
	Timeout time.Duration

	// This field allows clients to refresh their token until MaxRefresh has passed.
	// Note that clients can refresh their token in the last moment of MaxRefresh.
	// This means that the maximum validity timespan for a token is MaxRefresh + Timeout.
	// Optional, defaults to 0 meaning not refreshable.
	MaxRefresh time.Duration

	// Callback function that should perform the authentication of the user based on userID and
	// password. Must return true on success, false on failure. Required.
	// Option return user id, if so, user id will be stored in Claim Array.
	Authenticator func(code string, c *gin.Context) (int, string, bool, error)

	// Callback function that should perform the authorization of the authenticated user. Called
	// only after an authentication success. Must return true on success, false on failure.
	// Optional, default to success.
	Authorizator func(userId int, role string, c *gin.Context) bool

	// Callback function that will be called during login.
	// Using this function it is possible to add additional payload data to the webtoken.
	// The data is then made available during requests via c.Get("JWT_PAYLOAD").
	// Note that the payload is not encrypted.
	// The attributes mentioned on can't be used as keys for the map.
	// Optional, by default no additional data will be set.
	PayloadFunc func(userID string) map[string]interface{}

	// User can define own Unauthorized func.
	Unauthorized func(*gin.Context, int, string)

	// Set the identity handler function
	IdentityHandler func(jwt.MapClaims) int

	AccessHandler func(jwt.MapClaims) string
	// TokenLookup is a string in the form of "<source>:<name>" that is used
	// to extract token from the request.
	// Optional. Default value "header:Authorization".
	// Possible values:
	// - "header:<name>"
	// - "query:<name>"
	// - "cookie:<name>"
	TokenLookup string

	// TokenHeadName is a string in the header. Default value is "Bearer"
	TokenHeadName string

	// TimeFunc provides the current time. You can override it to use another time value. This is useful for testing or if your server uses a different time zone than your tokens.
	TimeFunc func() time.Time

	// HTTP Status messages for when something in the JWT middleware fails.
	// Check error (e) to determine the appropriate error message.
	HTTPStatusMessageFunc func(e error, c *gin.Context) string

GinJWTMiddleware provides a Json-Web-Token authentication implementation. On failure, a 401 HTTP response is returned. On success, the wrapped middleware is called, and the userID is made available as c.Get("userID").(string). Users can get a token by posting a json request to LoginHandler. The token then needs to be passed in the Authentication header. Example: Authorization:Bearer XXX_TOKEN_XXX

func (*GinJWTMiddleware) LoginHandler

func (mw *GinJWTMiddleware) LoginHandler(c *gin.Context)

LoginHandler can be used by clients to get a jwt token. Payload needs to be json in the form of {"username": "USERNAME", "password": "PASSWORD"}. Reply will be of the form {"token": "TOKEN"}.

func (*GinJWTMiddleware) MiddlewareFunc

func (mw *GinJWTMiddleware) MiddlewareFunc() gin.HandlerFunc

MiddlewareFunc makes GinJWTMiddleware implement the Middleware interface.

func (*GinJWTMiddleware) MiddlewareInit

func (mw *GinJWTMiddleware) MiddlewareInit() error

MiddlewareInit initialize jwt configs.

func (*GinJWTMiddleware) RefreshHandler

func (mw *GinJWTMiddleware) RefreshHandler(c *gin.Context)

RefreshHandler can be used to refresh a token. The token still needs to be valid on refresh. Shall be put under an endpoint that is using the GinJWTMiddleware. Reply will be of the form {"token": "TOKEN"}.

func (*GinJWTMiddleware) TokenGenerator

func (mw *GinJWTMiddleware) TokenGenerator(userID string) (string, time.Time, error)

TokenGenerator method that clients can use to get a jwt token.

type Login

type Login struct {
	Code string `form:"code" json:"code" binding:"required"`

Login form structure.

Package Files

Documentation was rendered with GOOS=linux and GOARCH=amd64.

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