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// Copyright 2024 OpenPubkey
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// SPDX-License-Identifier: Apache-2.0
package oidc
import (
"fmt"
)
type Jwt struct {
payload string
payloadClaims *OidcClaims
signature *Signature
raw []byte
}
func NewJwt(token []byte) (*Jwt, error) {
protected, payload, signature, err := SplitCompact(token)
if err != nil {
return nil, err
}
idt := &Jwt{
payload: string(payload),
signature: &Signature{
Protected: string(protected),
Signature: string(signature),
},
raw: token,
}
if err := ParseJWTSegment(protected, &idt.signature.protectedClaims); err != nil {
return nil, fmt.Errorf("error parsing protected: %w", err)
}
if err := ParseJWTSegment(payload, &idt.payloadClaims); err != nil {
return nil, fmt.Errorf("error parsing payload: %w", err)
}
return idt, nil
}
func (i *Jwt) GetClaims() *OidcClaims {
return i.payloadClaims
}
func (i *Jwt) GetPayload() string {
return i.payload
}
func (i *Jwt) GetSignature() *Signature {
return i.signature
}
func (i *Jwt) GetRaw() []byte {
return i.raw
}
// Compares two JWTs and determines if they are for the same identity (subject)
func SameIdentity(t1, t2 []byte) error {
token1, err := NewJwt(t1)
if err != nil {
return err
}
token2, err := NewJwt(t2)
if err != nil {
return err
}
// Subject identity can only be established within the same issuer
if token1.GetClaims().Issuer != token2.GetClaims().Issuer {
return fmt.Errorf("tokens have different issuers")
}
if token1.GetClaims().Subject != token2.GetClaims().Subject {
return fmt.Errorf("token have a different subject claims")
}
return nil
}
// RequireOlder returns an error if t1 is not older than t2
func RequireOlder(t1, t2 []byte) error {
token1, err := NewJwt(t1)
if err != nil {
return err
}
token2, err := NewJwt(t2)
if err != nil {
return err
}
// Check which token was issued first
if token1.GetClaims().IssuedAt > token2.GetClaims().IssuedAt {
return fmt.Errorf("tokens not issued in correct order")
}
return nil
}
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