/
jwt_valdiate.go
77 lines (67 loc) · 2.28 KB
/
jwt_valdiate.go
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package handle
import (
"context"
"encoding/json"
"errors"
"fmt"
"github.com/MicahParks/keyfunc"
"github.com/golang-jwt/jwt/v4"
"github.com/google/uuid"
"github.com/MicahParks/magiclinksdev/model"
"github.com/MicahParks/magiclinksdev/network/middleware/ctxkey"
)
var (
// ErrToken is returned when the JWT is invalid.
ErrToken = errors.New("JWT invalid")
)
// HandleJWTValidate handles the JWT validation endpoint.
func (s *Server) HandleJWTValidate(ctx context.Context, req model.ValidJWTValidateRequest) (model.JWTValidateResponse, error) {
jwtValidateArgs := req.JWTValidateArgs
sa := ctx.Value(ctxkey.ServiceAccount).(model.ServiceAccount)
token, err := jwt.Parse(jwtValidateArgs.JWT, func(token *jwt.Token) (interface{}, error) {
jwksBytes, err := s.JWKS.JSONPublic(ctx) // Change to JSONPrivate if HMAC support is added.
if err != nil {
return nil, fmt.Errorf("failed to get JWKS JSON: %w", err)
}
jwks, err := keyfunc.NewJSON(jwksBytes)
if err != nil {
return nil, fmt.Errorf("failed to create keyfunc from JSON: %w", err)
}
return jwks.Keyfunc(token)
})
if err != nil {
var errJWTValid *jwt.ValidationError
if errors.Is(err, keyfunc.ErrKIDNotFound) || errors.As(err, &errJWTValid) {
return model.JWTValidateResponse{}, fmt.Errorf("%w: %s", ErrToken, err)
}
return model.JWTValidateResponse{}, fmt.Errorf("failed to parse JWT: %w", err)
}
if !token.Valid {
return model.JWTValidateResponse{}, fmt.Errorf("%w: token invalid", ErrToken)
}
claims, ok := token.Claims.(jwt.MapClaims)
if !ok {
return model.JWTValidateResponse{}, fmt.Errorf("%w: claims invalid", ErrToken)
}
ok = claims.VerifyIssuer(s.Config.Iss, true)
if !ok {
return model.JWTValidateResponse{}, fmt.Errorf("%w: issuer invalid", ErrToken)
}
ok = claims.VerifyAudience(sa.Aud.String(), true)
if !ok {
return model.JWTValidateResponse{}, fmt.Errorf("%w: incorrect audience for this service account", ErrToken)
}
raw, err := json.Marshal(claims)
if err != nil {
return model.JWTValidateResponse{}, fmt.Errorf("failed to marshal claims: %w", err)
}
response := model.JWTValidateResponse{
JWTValidateResults: model.JWTValidateResults{
JWTClaims: raw,
},
RequestMetadata: model.RequestMetadata{
UUID: ctx.Value(ctxkey.RequestUUID).(uuid.UUID),
},
}
return response, nil
}