text: // Copyright 2021 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.
  //
  ///////////////////////////////////////////////////////////////////////////////
  
  #include "tink/jwt/internal/jwt_public_key_verify_wrapper.h"
  
  #include <utility>
  
  #include "absl/status/status.h"
  #include "tink/jwt/internal/jwt_format.h"
  #include "tink/jwt/internal/jwt_public_key_verify_internal.h"
  #include "tink/jwt/jwt_public_key_verify.h"
  #include "tink/primitive_set.h"
  #include "tink/util/status.h"
  #include "tink/util/statusor.h"
  
  namespace crypto {
  namespace tink {
  namespace jwt_internal {
  
  using google::crypto::tink::OutputPrefixType;
  
  namespace {
  
  class JwtPublicKeyVerifySetWrapper : public JwtPublicKeyVerify {
   public:
    explicit JwtPublicKeyVerifySetWrapper(
        std::unique_ptr<PrimitiveSet<JwtPublicKeyVerifyInternal>> jwt_verify_set)
        : jwt_verify_set_(std::move(jwt_verify_set)) {}
  
    crypto::tink::util::StatusOr<crypto::tink::VerifiedJwt> VerifyAndDecode(
        absl::string_view compact,
        const crypto::tink::JwtValidator& validator) const override;
  
    ~JwtPublicKeyVerifySetWrapper() override {}
  
   private:
    std::unique_ptr<PrimitiveSet<JwtPublicKeyVerifyInternal>> jwt_verify_set_;
  };
  
  util::Status Validate(
      PrimitiveSet<JwtPublicKeyVerifyInternal>* jwt_verify_set) {
    if (jwt_verify_set == nullptr) {
      return util::Status(absl::StatusCode::kInternal,
                          "jwt_verify_set must be non-NULL");
    }
    for (const auto* entry : jwt_verify_set->get_all()) {
      if ((entry->get_output_prefix_type() != OutputPrefixType::RAW) &&
          (entry->get_output_prefix_type() != OutputPrefixType::TINK)) {
        return util::Status(absl::StatusCode::kInvalidArgument,
                            "all JWT keys must be either RAW or TINK");
      }
    }
    return util::OkStatus();
  }
  
  util::StatusOr<crypto::tink::VerifiedJwt>
  JwtPublicKeyVerifySetWrapper::VerifyAndDecode(
      absl::string_view compact,
      const crypto::tink::JwtValidator& validator) const {
    absl::optional<util::Status> interesting_status;
    for (const auto* entry : jwt_verify_set_->get_all()) {
      JwtPublicKeyVerifyInternal& jwt_verify = entry->get_primitive();
      absl::optional<std::string> kid =
          GetKid(entry->get_key_id(), entry->get_output_prefix_type());
      util::StatusOr<VerifiedJwt> verified_jwt =
          jwt_verify.VerifyAndDecodeWithKid(compact, validator, kid);
      if (verified_jwt.ok()) {
        return verified_jwt;
      } else if (verified_jwt.status().code() !=
                 absl::StatusCode::kUnauthenticated) {
        // errors that are not the result of a signature verification
        interesting_status = verified_jwt.status();
      }
    }
    if (interesting_status.has_value()) {
      return *std::move(interesting_status);
    }
    return util::Status(absl::StatusCode::kInvalidArgument,
                        "verification failed");
  }
  
  }  // namespace
  
  util::StatusOr<std::unique_ptr<JwtPublicKeyVerify>>
  JwtPublicKeyVerifyWrapper::Wrap(
      std::unique_ptr<PrimitiveSet<JwtPublicKeyVerifyInternal>> jwt_verify_set)
      const {
    util::Status status = Validate(jwt_verify_set.get());
    if (!status.ok()) return status;
    std::unique_ptr<JwtPublicKeyVerify> jwt_verify =
        absl::make_unique<JwtPublicKeyVerifySetWrapper>(
            std::move(jwt_verify_set));
    return std::move(jwt_verify);
  }
  
  }  // namespace jwt_internal
  }  // namespace tink
  }  // namespace crypto
  