////////////////////////////////////////////////////////////////////////////////
// Copyright 2018 Google LLC.
//
// This software is licensed under the terms defined in the Widevine Master
// License Agreement. For a copy of this agreement, please contact
// widevine-licensing@google.com.
////////////////////////////////////////////////////////////////////////////////
//
// Description:
//   Definitions of the protocol buffer messages used in the Widevine license
//   exchange protocol for Media CAS.

syntax = "proto2";

option java_package = "com.google.video.widevine.mediacaslicense";

import "protos/public/license_protocol.proto";
import "protos/public/license_server_sdk.proto";
import "protos/public/media_cas_encryption.proto";

package widevine;

message CasDrmLicenseRequest {
  // The request payload. This is usually the HTTP Post body of a request.
  // Required.
  optional bytes payload = 1;
  // The content provider whose proxy is sending this license request onto the
  // Widevine license service.  Required.
  optional string provider_id = 2;
  // An identifier supplied by a content provider, used to identify a piece of
  // content and derive key IDs and content keys.
  optional bytes content_id = 3;
  // A ContentKeySpec identifies a content key by track type name. It also
  // specifies the policy that should be used for this key.
  // TODO(user): Consolidate this ContentKeySpec with
  // ModularDrmLicenseRequest_ContentKeySpec. Both should include a common
  // ContentKeySpec.
  message ContentKeySpec {
    optional License.KeyContainer.SecurityLevel security_level = 1;
    optional License.KeyContainer.OutputProtection required_output_protection =
        2;
    optional License.KeyContainer.OutputProtection requested_output_protection =
        3;
    // Optionally specify even, odd or single slot for key rotation.
    repeated CasEncryptionResponse.KeyInfo entitlement_keys = 4;
    optional License.KeyContainer.KeyType key_type = 5;
  }
  repeated ContentKeySpec content_key_specs = 4;
  // Policy for the entire license such as playback duration.
  optional License.Policy policy = 5;
}

message CasDrmLicenseResponse {
  enum Status {
    UNKNOWN = 0;
    OK = 1;
    SIGNATURE_FAILED = 2;
    INVALID_LICENSE_CHALLENGE = 3;
    PROVIDER_ID_MISSING = 4;
    INVALID_CONTENT_INFO = 5;
    EMPTY_CONTENT_INFO = 6;
    CONTENT_ID_MISMATCH = 7;
    MISSING_CONTENT_ID = 8;
    MALFORMED_REQUEST = 9;
    INTERNAL_ERROR = 10;
  }
  optional Status status = 1;
  optional string status_message = 2;
  // Serialzed bytes for a CAS license.
  // TODO(user): Until a CAS license protocol is defined, this field is a
  // serialized License message defined in license_protocol.proto.
  optional bytes license = 3;
  // Actual SDK license status as defined in widevine/server/sdk/error.proto.
  optional uint32 internal_status = 4;
  // Indicates the type of message in the license response.
  optional SignedMessage.MessageType message_type = 5;
  // A subset of data from the Widevine PSSH.
  message PsshData {
    repeated bytes key_id = 1;
    optional bytes content_id = 2;
  }
  message LicenseMetadata {
    optional bytes content_id = 1;
    repeated bytes key_id = 2;
  }
  optional PsshData pssh_data = 6;
  optional SessionState session_state = 7;
  optional string content_owner = 8;
  optional string content_provider = 9;
  optional LicenseMetadata license_metadata = 10;
}

message SignedCasDrmRequest {
  optional bytes request = 1;
  optional bytes signature = 2;
  // Identifies the entity sending / signing the request.  Required if signature
  // is present.
  optional string signer = 3;
  // The IP Address of the portal that is forwarding the request from the
  // original sender.
  optional string client_ip_address = 4;
  // The client software identifier, as used by HTTP.
  optional string user_agent = 5;
  optional string provider = 6;
}

message SignedCasDrmResponse {
  optional bytes response = 1;
  optional bytes signature = 2;
}