/
parse.go
66 lines (50 loc) · 1.3 KB
/
parse.go
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package jwt
import (
"encoding/json"
"errors"
"strings"
)
var (
// ErrInvalidSignature is returned when a token's
// signature is invalidated by a signer.
ErrInvalidSignature = errors.New("jwt.Parse: token has invalid signature")
// ErrMalformedToken is returned when a token
// doesn't contain a valid format of "header.payload.signature".
ErrMalformedToken = errors.New("jwt.Parse: token is malformed")
)
// Parse parses a string token using a specific signer and returns
// a JSON Web Token if all conditions are met for parsing it.
func Parse(s Signer, token string) (*JWT, error) {
jot := &JWT{}
sep1 := strings.IndexByte(token, '.')
if sep1 == -1 {
return nil, ErrMalformedToken
}
sep2 := strings.IndexByte(token[sep1+1:], '.')
if sep2 == -1 {
return nil, ErrMalformedToken
}
sep2 += len(token[:sep1+1])
dec, err := decode(token[sep2+1:])
if err != nil {
return nil, err
}
if err = s.Verify([]byte(token[:sep2]), dec); err != nil {
return nil, err
}
dec, err = decode(token[:sep1])
if err != nil {
return nil, err
}
if err = json.Unmarshal(dec, &jot.header); err != nil {
return nil, err
}
dec, err = decode(token[sep1+1 : sep2])
if err != nil {
return nil, err
}
if err = json.Unmarshal(dec, &jot.claims); err != nil {
return nil, err
}
return jot, nil
}