// https://github.com/cloudevents/spec/blob/main/cloudevents/formats/cloudevents.proto

/**
 * CloudEvent Protobuf Format
 *
 * - Required context attributes are explicitly represented.
 * - Optional and Extension context attributes are carried in a map structure.
 * - Data may be represented as binary, text, or protobuf messages.
 */

syntax = "proto3";

package io.cloudevents.v1;

import "google/protobuf/any.proto";
import "google/protobuf/timestamp.proto";

option csharp_namespace = "Microsoft.AutoGen.Contracts";


message CloudEvent {

  // -- CloudEvent Context Attributes

  // Required Attributes
  string id = 1;
  string source = 2; // URI-reference
  string spec_version = 3;
  string type = 4;

  // Optional & Extension Attributes
  map<string, CloudEventAttributeValue> attributes = 5;

  // -- CloudEvent Data (Bytes, Text, or Proto)
  oneof  data {
    bytes binary_data = 6;
    string text_data = 7;
    google.protobuf.Any proto_data = 8;
  }

  /**
   * The CloudEvent specification defines
   * seven attribute value types...
   */

  message CloudEventAttributeValue {

    oneof attr {
      bool ce_boolean = 1;
      int32 ce_integer = 2;
      string ce_string = 3;
      bytes ce_bytes = 4;
      string ce_uri = 5;
      string ce_uri_ref = 6;
      google.protobuf.Timestamp ce_timestamp = 7;
    }
  }
}