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package jose
import (
"fmt"
"strings"
)
type JWS struct {
RawHeader string
Header JOSEHeader
RawPayload string
Payload []byte
Signature []byte
}
// Given a raw encoded JWS token parses it and verifies the structure.
func ParseJWS(raw string) (JWS, error) {
parts := strings.Split(raw, ".")
if len(parts) != 3 {
return JWS{}, fmt.Errorf("malformed JWS, only %d segments", len(parts))
}
rawSig := parts[2]
jws := JWS{
RawHeader: parts[0],
RawPayload: parts[1],
}
header, err := decodeHeader(jws.RawHeader)
if err != nil {
return JWS{}, fmt.Errorf("malformed JWS, unable to decode header, %s", err)
}
if err = header.Validate(); err != nil {
return JWS{}, fmt.Errorf("malformed JWS, %s", err)
}
jws.Header = header
payload, err := decodeSegment(jws.RawPayload)
if err != nil {
return JWS{}, fmt.Errorf("malformed JWS, unable to decode payload: %s", err)
}
jws.Payload = payload
sig, err := decodeSegment(rawSig)
if err != nil {
return JWS{}, fmt.Errorf("malformed JWS, unable to decode signature: %s", err)
}
jws.Signature = sig
return jws, nil
}