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