127 lines
3.4 KiB
Go
127 lines
3.4 KiB
Go
package usecase
|
|
|
|
import (
|
|
"context"
|
|
"errors"
|
|
"fmt"
|
|
|
|
"github.com/lestrrat-go/jwx/jwa"
|
|
"github.com/lestrrat-go/jwx/jwt"
|
|
|
|
"source.toby3d.me/website/indieauth/internal/domain"
|
|
"source.toby3d.me/website/indieauth/internal/session"
|
|
"source.toby3d.me/website/indieauth/internal/token"
|
|
)
|
|
|
|
type tokenUseCase struct {
|
|
sessions session.Repository
|
|
tokens token.Repository
|
|
config *domain.Config
|
|
}
|
|
|
|
func NewTokenUseCase(tokens token.Repository, sessions session.Repository, config *domain.Config) token.UseCase {
|
|
jwt.RegisterCustomField("scope", make(domain.Scopes, 0))
|
|
|
|
return &tokenUseCase{
|
|
config: config,
|
|
sessions: sessions,
|
|
tokens: tokens,
|
|
}
|
|
}
|
|
|
|
func (useCase *tokenUseCase) Exchange(ctx context.Context, opts token.ExchangeOptions) (*domain.Token, *domain.Profile,
|
|
error) {
|
|
session, err := useCase.sessions.GetAndDelete(ctx, opts.Code)
|
|
if err != nil {
|
|
return nil, nil, fmt.Errorf("cannot get session from store: %w", err)
|
|
}
|
|
|
|
if opts.ClientID.String() != session.ClientID.String() {
|
|
return nil, nil, token.ErrMismatchClientID
|
|
}
|
|
|
|
if opts.RedirectURI.String() != session.RedirectURI.String() {
|
|
return nil, nil, token.ErrMismatchRedirectURI
|
|
}
|
|
|
|
if session.CodeChallenge != "" &&
|
|
!session.CodeChallengeMethod.Validate(session.CodeChallenge, opts.CodeVerifier) {
|
|
return nil, nil, token.ErrMismatchPKCE
|
|
}
|
|
|
|
// NOTE(toby3d): If the authorization code was issued with no scope, the
|
|
// token endpoint MUST NOT issue an access token, as empty scopes are
|
|
// invalid (RFC 6749 section 3.3).
|
|
if session.Scope.IsEmpty() {
|
|
return nil, nil, token.ErrEmptyScope
|
|
}
|
|
|
|
tkn, err := domain.NewToken(domain.NewTokenOptions{
|
|
Algorithm: useCase.config.JWT.Algorithm,
|
|
Expiration: useCase.config.JWT.Expiry,
|
|
Issuer: session.ClientID,
|
|
NonceLength: useCase.config.JWT.NonceLength,
|
|
Scope: session.Scope,
|
|
Secret: []byte(useCase.config.JWT.Secret),
|
|
Subject: session.Me,
|
|
})
|
|
if err != nil {
|
|
return nil, nil, fmt.Errorf("cannot generate a new access token: %w", err)
|
|
}
|
|
|
|
if !session.Scope.Has(domain.ScopeProfile) {
|
|
return tkn, nil, nil
|
|
}
|
|
|
|
p := new(domain.Profile)
|
|
|
|
// TODO(toby3d): if session.Scope.Has(domain.ScopeEmail) {}
|
|
|
|
return tkn, p, nil
|
|
}
|
|
|
|
func (useCase *tokenUseCase) Verify(ctx context.Context, accessToken string) (*domain.Token, error) {
|
|
find, err := useCase.tokens.Get(ctx, accessToken)
|
|
if err != nil && !errors.Is(err, token.ErrNotExist) {
|
|
return nil, fmt.Errorf("cannot check token in store: %w", err)
|
|
}
|
|
|
|
if find != nil {
|
|
return nil, token.ErrRevoke
|
|
}
|
|
|
|
tkn, err := jwt.ParseString(accessToken, jwt.WithVerify(jwa.SignatureAlgorithm(useCase.config.JWT.Algorithm),
|
|
[]byte(useCase.config.JWT.Secret)))
|
|
if err != nil {
|
|
return nil, fmt.Errorf("cannot parse JWT token: %w", err)
|
|
}
|
|
|
|
if err = jwt.Validate(tkn); err != nil {
|
|
return nil, fmt.Errorf("cannot validate JWT token: %w", err)
|
|
}
|
|
|
|
result := new(domain.Token)
|
|
result.AccessToken = accessToken
|
|
result.ClientID, _ = domain.ParseClientID(tkn.Issuer())
|
|
result.Me, _ = domain.ParseMe(tkn.Subject())
|
|
|
|
if scope, ok := tkn.Get("scope"); ok {
|
|
result.Scope, _ = scope.(domain.Scopes)
|
|
}
|
|
|
|
return result, nil
|
|
}
|
|
|
|
func (useCase *tokenUseCase) Revoke(ctx context.Context, accessToken string) error {
|
|
tkn, err := useCase.Verify(ctx, accessToken)
|
|
if err != nil {
|
|
return fmt.Errorf("cannot verify token: %w", err)
|
|
}
|
|
|
|
if err = useCase.tokens.Create(ctx, tkn); err != nil {
|
|
return fmt.Errorf("cannot save token in database: %w", err)
|
|
}
|
|
|
|
return nil
|
|
}
|