| // Copyright 2022 Google LLC |
| // |
| // 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. |
| // |
| //////////////////////////////////////////////////////////////////////////////// |
| |
| package jwt |
| |
| import ( |
| "fmt" |
| |
| "github.com/google/tink/go/core/primitiveset" |
| "github.com/google/tink/go/keyset" |
| ) |
| |
| // NewVerifier generates a new instance of the JWT Verifier primitive. |
| func NewVerifier(h *keyset.Handle) (Verifier, error) { |
| if h == nil { |
| return nil, fmt.Errorf("keyset handle can't be nil") |
| } |
| ps, err := h.PrimitivesWithKeyManager(nil) |
| if err != nil { |
| return nil, fmt.Errorf("jwt_verifier_factory: cannot obtain primitive set: %v", err) |
| } |
| return newWrappedVerifier(ps) |
| } |
| |
| // wrappedVerifier is a JWT Verifier implementation that uses the underlying primitive set for JWT Verifier. |
| type wrappedVerifier struct { |
| ps *primitiveset.PrimitiveSet |
| } |
| |
| var _ Verifier = (*wrappedVerifier)(nil) |
| |
| func newWrappedVerifier(ps *primitiveset.PrimitiveSet) (*wrappedVerifier, error) { |
| if _, ok := (ps.Primary.Primitive).(*verifierWithKID); !ok { |
| return nil, fmt.Errorf("jwt_verifier_factory: not a JWT Verifier primitive") |
| } |
| for _, primitives := range ps.Entries { |
| for _, p := range primitives { |
| if _, ok := (p.Primitive).(*verifierWithKID); !ok { |
| return nil, fmt.Errorf("jwt_verifier_factory: not a JWT Verifier primitive") |
| } |
| } |
| } |
| return &wrappedVerifier{ps: ps}, nil |
| } |
| |
| func (w *wrappedVerifier) VerifyAndDecode(compact string, validator *Validator) (*VerifiedJWT, error) { |
| for _, s := range w.ps.Entries { |
| for _, e := range s { |
| p, ok := e.Primitive.(*verifierWithKID) |
| if !ok { |
| return nil, fmt.Errorf("jwt_verifier_factory: not a JWT Verifier primitive") |
| } |
| if verifiedJWT, err := p.VerifyAndDecodeWithKID(compact, validator, keyID(e.KeyID, e.PrefixType)); err == nil { |
| return verifiedJWT, nil |
| } |
| } |
| } |
| return nil, fmt.Errorf("verification failed") |
| } |