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// Copyright 2025 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.

syntax = "proto3";

package google.api;

option go_package = "google.golang.org/genproto/googleapis/api/serviceconfig;serviceconfig";
option java_multiple_files = true;
option java_outer_classname = "AuthProto";
option java_package = "com.google.api";
option objc_class_prefix = "GAPI";

// `Authentication` defines the authentication configuration for API methods
// provided by an API service.
//
// Example:
//
//     name: calendar.googleapis.com
//     authentication:
//       providers:
//       - id: google_calendar_auth
//         jwks_uri: https://www.googleapis.com/oauth2/v1/certs
//         issuer: https://securetoken.google.com
//       rules:
//       - selector: "*"
//         requirements:
//           provider_id: google_calendar_auth
//       - selector: google.calendar.Delegate
//         oauth:
//           canonical_scopes: https://www.googleapis.com/auth/calendar.read
message Authentication {
  // A list of authentication rules that apply to individual API methods.
  //
  // **NOTE:** All service configuration rules follow "last one wins" order.
  repeated AuthenticationRule rules = 3;

  // Defines a set of authentication providers that a service supports.
  repeated AuthProvider providers = 4;
}

// Authentication rules for the service.
//
// By default, if a method has any authentication requirements, every request
// must include a valid credential matching one of the requirements.
// It's an error to include more than one kind of credential in a single
// request.
//
// If a method doesn't have any auth requirements, request credentials will be
// ignored.
message AuthenticationRule {
  // Selects the methods to which this rule applies.
  //
  // Refer to [selector][google.api.DocumentationRule.selector] for syntax
  // details.
  string selector = 1;

  // The requirements for OAuth credentials.
  OAuthRequirements oauth = 2;

  // If true, the service accepts API keys without any other credential.
  // This flag only applies to HTTP and gRPC requests.
  bool allow_without_credential = 5;

  // Requirements for additional authentication providers.
  repeated AuthRequirement requirements = 7;
}

// Specifies a location to extract JWT from an API request.
message JwtLocation {
  oneof in {
    // Specifies HTTP header name to extract JWT token.
    string header = 1;

    // Specifies URL query parameter name to extract JWT token.
    string query = 2;

    // Specifies cookie name to extract JWT token.
    string cookie = 4;
  }

  // The value prefix. The value format is "value_prefix{token}"
  // Only applies to "in" header type. Must be empty for "in" query type.
  // If not empty, the header value has to match (case sensitive) this prefix.
  // If not matched, JWT will not be extracted. If matched, JWT will be
  // extracted after the prefix is removed.
  //
  // For example, for "Authorization: Bearer {JWT}",
  // value_prefix="Bearer " with a space at the end.
  string value_prefix = 3;
}

// Configuration for an authentication provider, including support for
// [JSON Web Token
// (JWT)](https://tools.ietf.org/html/draft-ietf-oauth-json-web-token-32).
message AuthProvider {
  // The unique identifier of the auth provider. It will be referred to by
  // `AuthRequirement.provider_id`.
  //
  // Example: "bookstore_auth".
  string id = 1;

  // Identifies the principal that issued the JWT. See
  // https://tools.ietf.org/html/draft-ietf-oauth-json-web-token-32#section-4.1.1
  // Usually a URL or an email address.
  //
  // Example: https://securetoken.google.com
  // Example: 1234567-compute@developer.gserviceaccount.com
  string issuer = 2;

  // URL of the provider's public key set to validate signature of the JWT. See
  // [OpenID
  // Discovery](https://openid.net/specs/openid-connect-discovery-1_0.html#ProviderMetadata).
  // Optional if the key set document:
  //  - can be retrieved from
  //    [OpenID
  //    Discovery](https://openid.net/specs/openid-connect-discovery-1_0.html)
  //    of the issuer.
  //  - can be inferred from the email domain of the issuer (e.g. a Google
  //  service account).
  //
  // Example: https://www.googleapis.com/oauth2/v1/certs
  string jwks_uri = 3;

  // The list of JWT
  // [audiences](https://tools.ietf.org/html/draft-ietf-oauth-json-web-token-32#section-4.1.3).
  // that are allowed to access. A JWT containing any of these audiences will
  // be accepted. When this setting is absent, JWTs with audiences:
  //   - "https://[service.name]/[google.protobuf.Api.name]"
  //   - "https://[service.name]/"
  // will be accepted.
  // For example, if no audiences are in the setting, LibraryService API will
  // accept JWTs with the following audiences:
  //   -
  //   https://library-example.googleapis.com/google.example.library.v1.LibraryService
  //   - https://library-example.googleapis.com/
  //
  // Example:
  //
  //     audiences: bookstore_android.apps.googleusercontent.com,
  //                bookstore_web.apps.googleusercontent.com
  string audiences = 4;

  // Redirect URL if JWT token is required but not present or is expired.
  // Implement authorizationUrl of securityDefinitions in OpenAPI spec.
  string authorization_url = 5;

  // Defines the locations to extract the JWT.  For now it is only used by the
  // Cloud Endpoints to store the OpenAPI extension [x-google-jwt-locations]
  // (https://cloud.google.com/endpoints/docs/openapi/openapi-extensions#x-google-jwt-locations)
  //
  // JWT locations can be one of HTTP headers, URL query parameters or
  // cookies. The rule is that the first match wins.
  //
  // If not specified,  default to use following 3 locations:
  //    1) Authorization: Bearer
  //    2) x-goog-iap-jwt-assertion
  //    3) access_token query parameter
  //
  // Default locations can be specified as followings:
  //    jwt_locations:
  //    - header: Authorization
  //      value_prefix: "Bearer "
  //    - header: x-goog-iap-jwt-assertion
  //    - query: access_token
  repeated JwtLocation jwt_locations = 6;
}

// OAuth scopes are a way to define data and permissions on data. For example,
// there are scopes defined for "Read-only access to Google Calendar" and
// "Access to Cloud Platform". Users can consent to a scope for an application,
// giving it permission to access that data on their behalf.
//
// OAuth scope specifications should be fairly coarse grained; a user will need
// to see and understand the text description of what your scope means.
//
// In most cases: use one or at most two OAuth scopes for an entire family of
// products. If your product has multiple APIs, you should probably be sharing
// the OAuth scope across all of those APIs.
//
// When you need finer grained OAuth consent screens: talk with your product
// management about how developers will use them in practice.
//
// Please note that even though each of the canonical scopes is enough for a
// request to be accepted and passed to the backend, a request can still fail
// due to the backend requiring additional scopes or permissions.
message OAuthRequirements {
  // The list of publicly documented OAuth scopes that are allowed access. An
  // OAuth token containing any of these scopes will be accepted.
  //
  // Example:
  //
  //      canonical_scopes: https://www.googleapis.com/auth/calendar,
  //                        https://www.googleapis.com/auth/calendar.read
  string canonical_scopes = 1;
}

// User-defined authentication requirements, including support for
// [JSON Web Token
// (JWT)](https://tools.ietf.org/html/draft-ietf-oauth-json-web-token-32).
message AuthRequirement {
  // [id][google.api.AuthProvider.id] from authentication provider.
  //
  // Example:
  //
  //     provider_id: bookstore_auth
  string provider_id = 1;

  // NOTE: This will be deprecated soon, once AuthProvider.audiences is
  // implemented and accepted in all the runtime components.
  //
  // The list of JWT
  // [audiences](https://tools.ietf.org/html/draft-ietf-oauth-json-web-token-32#section-4.1.3).
  // that are allowed to access. A JWT containing any of these audiences will
  // be accepted. When this setting is absent, only JWTs with audience
  // "https://[Service_name][google.api.Service.name]/[API_name][google.protobuf.Api.name]"
  // will be accepted. For example, if no audiences are in the setting,
  // LibraryService API will only accept JWTs with the following audience
  // "https://library-example.googleapis.com/google.example.library.v1.LibraryService".
  //
  // Example:
  //
  //     audiences: bookstore_android.apps.googleusercontent.com,
  //                bookstore_web.apps.googleusercontent.com
  string audiences = 2;
}
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