forked from ebhomengo/niki
142 lines
3.1 KiB
Go
142 lines
3.1 KiB
Go
package jwt
|
|
|
|
import (
|
|
"encoding/base64"
|
|
"encoding/json"
|
|
)
|
|
|
|
// Keyfunc will be used by the Parse methods as a callback function to supply
|
|
|
|
// the key for verification. The function receives the parsed, but unverified
|
|
|
|
// Token. This allows you to use properties in the Header of the token (such as
|
|
|
|
// `kid`) to identify which key to use.
|
|
|
|
type Keyfunc func(*Token) (interface{}, error)
|
|
|
|
// Token represents a JWT Token. Different fields will be used depending on
|
|
|
|
// whether you're creating or parsing/verifying a token.
|
|
|
|
type Token struct {
|
|
Raw string // Raw contains the raw token. Populated when you [Parse] a token
|
|
|
|
Method SigningMethod // Method is the signing method used or to be used
|
|
|
|
Header map[string]interface{} // Header is the first segment of the token in decoded form
|
|
|
|
Claims Claims // Claims is the second segment of the token in decoded form
|
|
|
|
Signature []byte // Signature is the third segment of the token in decoded form. Populated when you Parse a token
|
|
|
|
Valid bool // Valid specifies if the token is valid. Populated when you Parse/Verify a token
|
|
|
|
}
|
|
|
|
// New creates a new [Token] with the specified signing method and an empty map
|
|
|
|
// of claims. Additional options can be specified, but are currently unused.
|
|
|
|
func New(method SigningMethod, opts ...TokenOption) *Token {
|
|
|
|
return NewWithClaims(method, MapClaims{}, opts...)
|
|
|
|
}
|
|
|
|
// NewWithClaims creates a new [Token] with the specified signing method and
|
|
|
|
// claims. Additional options can be specified, but are currently unused.
|
|
|
|
func NewWithClaims(method SigningMethod, claims Claims, opts ...TokenOption) *Token {
|
|
|
|
return &Token{
|
|
|
|
Header: map[string]interface{}{
|
|
|
|
"typ": "JWT",
|
|
|
|
"alg": method.Alg(),
|
|
},
|
|
|
|
Claims: claims,
|
|
|
|
Method: method,
|
|
}
|
|
|
|
}
|
|
|
|
// SignedString creates and returns a complete, signed JWT. The token is signed
|
|
|
|
// using the SigningMethod specified in the token. Please refer to
|
|
|
|
// https://golang-jwt.github.io/jwt/usage/signing_methods/#signing-methods-and-key-types
|
|
|
|
// for an overview of the different signing methods and their respective key
|
|
|
|
// types.
|
|
|
|
func (t *Token) SignedString(key interface{}) (string, error) {
|
|
|
|
sstr, err := t.SigningString()
|
|
|
|
if err != nil {
|
|
|
|
return "", err
|
|
|
|
}
|
|
|
|
sig, err := t.Method.Sign(sstr, key)
|
|
|
|
if err != nil {
|
|
|
|
return "", err
|
|
|
|
}
|
|
|
|
return sstr + "." + t.EncodeSegment(sig), nil
|
|
|
|
}
|
|
|
|
// SigningString generates the signing string. This is the most expensive part
|
|
|
|
// of the whole deal. Unless you need this for something special, just go
|
|
|
|
// straight for the SignedString.
|
|
|
|
func (t *Token) SigningString() (string, error) {
|
|
|
|
h, err := json.Marshal(t.Header)
|
|
|
|
if err != nil {
|
|
|
|
return "", err
|
|
|
|
}
|
|
|
|
c, err := json.Marshal(t.Claims)
|
|
|
|
if err != nil {
|
|
|
|
return "", err
|
|
|
|
}
|
|
|
|
return t.EncodeSegment(h) + "." + t.EncodeSegment(c), nil
|
|
|
|
}
|
|
|
|
// EncodeSegment encodes a JWT specific base64url encoding with padding
|
|
|
|
// stripped. In the future, this function might take into account a
|
|
|
|
// [TokenOption]. Therefore, this function exists as a method of [Token], rather
|
|
|
|
// than a global function.
|
|
|
|
func (*Token) EncodeSegment(seg []byte) string {
|
|
|
|
return base64.RawURLEncoding.EncodeToString(seg)
|
|
|
|
}
|