jws

type ClaimSet struct {
	Iss   string `json:"iss"`             // email address of the client_id of the application making the access token request
	Scope string `json:"scope,omitempty"` // space-delimited list of the permissions the application requests
	Aud   string `json:"aud"`             // descriptor of the intended target of the assertion (Optional).
	Exp   int64  `json:"exp"`             // the expiration time of the assertion (seconds since Unix epoch)
	Iat   int64  `json:"iat"`             // the time the assertion was issued (seconds since Unix epoch)
	Typ   string `json:"typ,omitempty"`   // token type (Optional).

	// Email for which the application is requesting delegated access (Optional).
	Sub string `json:"sub,omitempty"`

	// The old name of Sub. Client keeps setting Prn to be
	// complaint with legacy OAuth 2.0 providers. (Optional)
	Prn string `json:"prn,omitempty"`

	// See http://tools.ietf.org/html/draft-jones-json-web-token-10#section-4.3
	// This array is marshalled using custom code (see (c *ClaimSet) encode()).
	PrivateClaims map[string]interface{} `json:"-"`
}

type Header struct {
	// The algorithm used for signature.
	Algorithm string `json:"alg"`

	// Represents the token type.
	Typ string `json:"typ"`

	// The optional hint of which key is being used.
	KeyID string `json:"kid,omitempty"`
}

type Signer func(data []byte) (sig []byte, err error)