session.proto

// Copyright 2023 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.cloud.dialogflow.v2;

import "google/api/annotations.proto";
import "google/api/client.proto";
import "google/api/field_behavior.proto";
import "google/api/resource.proto";
import "google/cloud/dialogflow/v2/audio_config.proto";
import "google/cloud/dialogflow/v2/context.proto";
import "google/cloud/dialogflow/v2/intent.proto";
import "google/cloud/dialogflow/v2/session_entity_type.proto";
import "google/protobuf/duration.proto";
import "google/protobuf/field_mask.proto";
import "google/protobuf/struct.proto";
import "google/rpc/status.proto";
import "google/type/latlng.proto";

option cc_enable_arenas = true;
option csharp_namespace = "Google.Cloud.Dialogflow.V2";
option go_package = "cloud.google.com/go/dialogflow/apiv2/dialogflowpb;dialogflowpb";
option java_multiple_files = true;
option java_outer_classname = "SessionProto";
option java_package = "com.google.cloud.dialogflow.v2";
option objc_class_prefix = "DF";
option (google.api.resource_definition) = {
  type: "dialogflow.googleapis.com/Session"
  pattern: "projects/{project}/agent/sessions/{session}"
  pattern: "projects/{project}/agent/environments/{environment}/users/{user}/sessions/{session}"
  pattern: "projects/{project}/locations/{location}/agent/sessions/{session}"
  pattern: "projects/{project}/locations/{location}/agent/environments/{environment}/users/{user}/sessions/{session}"
};

// A service used for session interactions.
//
// For more information, see the [API interactions
// guide](https://cloud.google.com/dialogflow/docs/api-overview).
service Sessions {
  option (google.api.default_host) = "dialogflow.googleapis.com";
  option (google.api.oauth_scopes) =
      "https://www.googleapis.com/auth/cloud-platform,"
      "https://www.googleapis.com/auth/dialogflow";

  // Processes a natural language query and returns structured, actionable data
  // as a result. This method is not idempotent, because it may cause contexts
  // and session entity types to be updated, which in turn might affect
  // results of future queries.
  //
  // If you might use
  // [Agent Assist](https://cloud.google.com/dialogflow/docs/#aa)
  // or other CCAI products now or in the future, consider using
  // [AnalyzeContent][google.cloud.dialogflow.v2.Participants.AnalyzeContent]
  // instead of `DetectIntent`. `AnalyzeContent` has additional
  // functionality for Agent Assist and other CCAI products.
  //
  // Note: Always use agent versions for production traffic.
  // See [Versions and
  // environments](https://cloud.google.com/dialogflow/es/docs/agents-versions).
  rpc DetectIntent(DetectIntentRequest) returns (DetectIntentResponse) {
    option (google.api.http) = {
      post: "/v2/{session=projects/*/agent/sessions/*}:detectIntent"
      body: "*"
      additional_bindings {
        post: "/v2/{session=projects/*/agent/environments/*/users/*/sessions/*}:detectIntent"
        body: "*"
      }
      additional_bindings {
        post: "/v2/{session=projects/*/locations/*/agent/sessions/*}:detectIntent"
        body: "*"
      }
      additional_bindings {
        post: "/v2/{session=projects/*/locations/*/agent/environments/*/users/*/sessions/*}:detectIntent"
        body: "*"
      }
    };
    option (google.api.method_signature) = "session,query_input";
  }

  // Processes a natural language query in audio format in a streaming fashion
  // and returns structured, actionable data as a result. This method is only
  // available via the gRPC API (not REST).
  //
  // If you might use
  // [Agent Assist](https://cloud.google.com/dialogflow/docs/#aa)
  // or other CCAI products now or in the future, consider using
  // [StreamingAnalyzeContent][google.cloud.dialogflow.v2.Participants.StreamingAnalyzeContent]
  // instead of `StreamingDetectIntent`. `StreamingAnalyzeContent` has
  // additional functionality for Agent Assist and other CCAI products.
  //
  // Note: Always use agent versions for production traffic.
  // See [Versions and
  // environments](https://cloud.google.com/dialogflow/es/docs/agents-versions).
  rpc StreamingDetectIntent(stream StreamingDetectIntentRequest)
      returns (stream StreamingDetectIntentResponse) {}
}

// The request to detect user's intent.
message DetectIntentRequest {
  // Required. The name of the session this query is sent to. Format:
  // `projects/<Project ID>/agent/sessions/<Session ID>`, or
  // `projects/<Project ID>/agent/environments/<Environment ID>/users/<User
  // ID>/sessions/<Session ID>`. If `Environment ID` is not specified, we assume
  // default 'draft' environment (`Environment ID` might be referred to as
  // environment name at some places). If `User ID` is not specified, we are
  // using "-". It's up to the API caller to choose an appropriate `Session ID`
  // and `User Id`. They can be a random number or some type of user and session
  // identifiers (preferably hashed). The length of the `Session ID` and
  // `User ID` must not exceed 36 characters.
  //
  // For more information, see the [API interactions
  // guide](https://cloud.google.com/dialogflow/docs/api-overview).
  //
  // Note: Always use agent versions for production traffic.
  // See [Versions and
  // environments](https://cloud.google.com/dialogflow/es/docs/agents-versions).
  string session = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {
      type: "dialogflow.googleapis.com/Session"
    }
  ];

  // The parameters of this query.
  QueryParameters query_params = 2;

  // Required. The input specification. It can be set to:
  //
  // 1.  an audio config
  //     which instructs the speech recognizer how to process the speech audio,
  //
  // 2.  a conversational query in the form of text, or
  //
  // 3.  an event that specifies which intent to trigger.
  QueryInput query_input = 3 [(google.api.field_behavior) = REQUIRED];

  // Instructs the speech synthesizer how to generate the output
  // audio. If this field is not set and agent-level speech synthesizer is not
  // configured, no output audio is generated.
  OutputAudioConfig output_audio_config = 4;

  // Mask for
  // [output_audio_config][google.cloud.dialogflow.v2.DetectIntentRequest.output_audio_config]
  // indicating which settings in this request-level config should override
  // speech synthesizer settings defined at agent-level.
  //
  // If unspecified or empty,
  // [output_audio_config][google.cloud.dialogflow.v2.DetectIntentRequest.output_audio_config]
  // replaces the agent-level config in its entirety.
  google.protobuf.FieldMask output_audio_config_mask = 7;

  // The natural language speech audio to be processed. This field
  // should be populated iff `query_input` is set to an input audio config.
  // A single request can contain up to 1 minute of speech audio data.
  bytes input_audio = 5;
}

// The message returned from the DetectIntent method.
message DetectIntentResponse {
  // The unique identifier of the response. It can be used to
  // locate a response in the training example set or for reporting issues.
  string response_id = 1;

  // The selected results of the conversational query or event processing.
  // See `alternative_query_results` for additional potential results.
  QueryResult query_result = 2;

  // Specifies the status of the webhook request.
  google.rpc.Status webhook_status = 3;

  // The audio data bytes encoded as specified in the request.
  // Note: The output audio is generated based on the values of default platform
  // text responses found in the `query_result.fulfillment_messages` field. If
  // multiple default text responses exist, they will be concatenated when
  // generating audio. If no default platform text responses exist, the
  // generated audio content will be empty.
  //
  // In some scenarios, multiple output audio fields may be present in the
  // response structure. In these cases, only the top-most-level audio output
  // has content.
  bytes output_audio = 4;

  // The config used by the speech synthesizer to generate the output audio.
  OutputAudioConfig output_audio_config = 6;
}

// Represents the parameters of the conversational query.
message QueryParameters {
  // The time zone of this conversational query from the
  // [time zone database](https://www.iana.org/time-zones), e.g.,
  // America/New_York, Europe/Paris. If not provided, the time zone specified in
  // agent settings is used.
  string time_zone = 1;

  // The geo location of this conversational query.
  google.type.LatLng geo_location = 2;

  // The collection of contexts to be activated before this query is
  // executed.
  repeated Context contexts = 3;

  // Specifies whether to delete all contexts in the current session
  // before the new ones are activated.
  bool reset_contexts = 4;

  // Additional session entity types to replace or extend developer
  // entity types with. The entity synonyms apply to all languages and persist
  // for the session of this query.
  repeated SessionEntityType session_entity_types = 5;

  // This field can be used to pass custom data to your webhook.
  // Arbitrary JSON objects are supported.
  // If supplied, the value is used to populate the
  // `WebhookRequest.original_detect_intent_request.payload`
  // field sent to your webhook.
  google.protobuf.Struct payload = 6;

  // Configures the type of sentiment analysis to perform. If not
  // provided, sentiment analysis is not performed.
  SentimentAnalysisRequestConfig sentiment_analysis_request_config = 10;

  // This field can be used to pass HTTP headers for a webhook
  // call. These headers will be sent to webhook along with the headers that
  // have been configured through the Dialogflow web console. The headers
  // defined within this field will overwrite the headers configured through the
  // Dialogflow console if there is a conflict. Header names are
  // case-insensitive. Google's specified headers are not allowed. Including:
  // "Host", "Content-Length", "Connection", "From", "User-Agent",
  // "Accept-Encoding", "If-Modified-Since", "If-None-Match", "X-Forwarded-For",
  // etc.
  map<string, string> webhook_headers = 14;
}

// Represents the query input. It can contain either:
//
// 1.  An audio config which
//     instructs the speech recognizer how to process the speech audio.
//
// 2.  A conversational query in the form of text,.
//
// 3.  An event that specifies which intent to trigger.
message QueryInput {
  // Required. The input specification.
  oneof input {
    // Instructs the speech recognizer how to process the speech audio.
    InputAudioConfig audio_config = 1;

    // The natural language text to be processed. Text length must not exceed
    // 256 character for virtual agent interactions.
    TextInput text = 2;

    // The event to be processed.
    EventInput event = 3;
  }
}

// Represents the result of conversational query or event processing.
message QueryResult {
  // The original conversational query text:
  //
  // - If natural language text was provided as input, `query_text` contains
  //   a copy of the input.
  // - If natural language speech audio was provided as input, `query_text`
  //   contains the speech recognition result. If speech recognizer produced
  //   multiple alternatives, a particular one is picked.
  // - If automatic spell correction is enabled, `query_text` will contain the
  //   corrected user input.
  string query_text = 1;

  // The language that was triggered during intent detection.
  // See [Language
  // Support](https://cloud.google.com/dialogflow/docs/reference/language)
  // for a list of the currently supported language codes.
  string language_code = 15;

  // The Speech recognition confidence between 0.0 and 1.0. A higher number
  // indicates an estimated greater likelihood that the recognized words are
  // correct. The default of 0.0 is a sentinel value indicating that confidence
  // was not set.
  //
  // This field is not guaranteed to be accurate or set. In particular this
  // field isn't set for StreamingDetectIntent since the streaming endpoint has
  // separate confidence estimates per portion of the audio in
  // StreamingRecognitionResult.
  float speech_recognition_confidence = 2;

  // The action name from the matched intent.
  string action = 3;

  // The collection of extracted parameters.
  //
  // Depending on your protocol or client library language, this is a
  // map, associative array, symbol table, dictionary, or JSON object
  // composed of a collection of (MapKey, MapValue) pairs:
  //
  // -   MapKey type: string
  // -   MapKey value: parameter name
  // -   MapValue type:
  //     -   If parameter's entity type is a composite entity: map
  //     -   Else: depending on parameter value type, could be one of string,
  //         number, boolean, null, list or map
  // -   MapValue value:
  //     -   If parameter's entity type is a composite entity:
  //         map from composite entity property names to property values
  //     -   Else: parameter value
  google.protobuf.Struct parameters = 4;

  // This field is set to:
  //
  // - `false` if the matched intent has required parameters and not all of
  //    the required parameter values have been collected.
  // - `true` if all required parameter values have been collected, or if the
  //    matched intent doesn't contain any required parameters.
  bool all_required_params_present = 5;

  // Indicates whether the conversational query triggers a cancellation for slot
  // filling. For more information, see the [cancel slot filling
  // documentation](https://cloud.google.com/dialogflow/es/docs/intents-actions-parameters#cancel).
  bool cancels_slot_filling = 21;

  // The text to be pronounced to the user or shown on the screen.
  // Note: This is a legacy field, `fulfillment_messages` should be preferred.
  string fulfillment_text = 6;

  // The collection of rich messages to present to the user.
  repeated Intent.Message fulfillment_messages = 7;

  // If the query was fulfilled by a webhook call, this field is set to the
  // value of the `source` field returned in the webhook response.
  string webhook_source = 8;

  // If the query was fulfilled by a webhook call, this field is set to the
  // value of the `payload` field returned in the webhook response.
  google.protobuf.Struct webhook_payload = 9;

  // The collection of output contexts. If applicable,
  // `output_contexts.parameters` contains entries with name
  // `<parameter name>.original` containing the original parameter values
  // before the query.
  repeated Context output_contexts = 10;

  // The intent that matched the conversational query. Some, not
  // all fields are filled in this message, including but not limited to:
  // `name`, `display_name`, `end_interaction` and `is_fallback`.
  Intent intent = 11;

  // The intent detection confidence. Values range from 0.0
  // (completely uncertain) to 1.0 (completely certain).
  // This value is for informational purpose only and is only used to
  // help match the best intent within the classification threshold.
  // This value may change for the same end-user expression at any time due to a
  // model retraining or change in implementation.
  // If there are `multiple knowledge_answers` messages, this value is set to
  // the greatest `knowledgeAnswers.match_confidence` value in the list.
  float intent_detection_confidence = 12;

  // Free-form diagnostic information for the associated detect intent request.
  // The fields of this data can change without notice, so you should not write
  // code that depends on its structure.
  // The data may contain:
  //
  // - webhook call latency
  // - webhook errors
  google.protobuf.Struct diagnostic_info = 14;

  // The sentiment analysis result, which depends on the
  // `sentiment_analysis_request_config` specified in the request.
  SentimentAnalysisResult sentiment_analysis_result = 17;
}

// The top-level message sent by the client to the
// [Sessions.StreamingDetectIntent][google.cloud.dialogflow.v2.Sessions.StreamingDetectIntent]
// method.
//
// Multiple request messages should be sent in order:
//
// 1.  The first message must contain
// [session][google.cloud.dialogflow.v2.StreamingDetectIntentRequest.session],
//     [query_input][google.cloud.dialogflow.v2.StreamingDetectIntentRequest.query_input]
//     plus optionally
//     [query_params][google.cloud.dialogflow.v2.StreamingDetectIntentRequest.query_params].
//     If the client wants to receive an audio response, it should also contain
//     [output_audio_config][google.cloud.dialogflow.v2.StreamingDetectIntentRequest.output_audio_config].
//     The message must not contain
//     [input_audio][google.cloud.dialogflow.v2.StreamingDetectIntentRequest.input_audio].
// 2.  If
// [query_input][google.cloud.dialogflow.v2.StreamingDetectIntentRequest.query_input]
// was set to
//     [query_input.audio_config][google.cloud.dialogflow.v2.InputAudioConfig],
//     all subsequent messages must contain
//     [input_audio][google.cloud.dialogflow.v2.StreamingDetectIntentRequest.input_audio]
//     to continue with Speech recognition. If you decide to rather detect an
//     intent from text input after you already started Speech recognition,
//     please send a message with
//     [query_input.text][google.cloud.dialogflow.v2.QueryInput.text].
//
//     However, note that:
//
//     * Dialogflow will bill you for the audio duration so far.
//     * Dialogflow discards all Speech recognition results in favor of the
//       input text.
//     * Dialogflow will use the language code from the first message.
//
// After you sent all input, you must half-close or abort the request stream.
message StreamingDetectIntentRequest {
  // Required. The name of the session the query is sent to.
  // Format of the session name:
  // `projects/<Project ID>/agent/sessions/<Session ID>`, or
  // `projects/<Project ID>/agent/environments/<Environment ID>/users/<User
  // ID>/sessions/<Session ID>`. If `Environment ID` is not specified, we assume
  // default 'draft' environment. If `User ID` is not specified, we are using
  // "-". It's up to the API caller to choose an appropriate `Session ID` and
  // `User Id`. They can be a random number or some type of user and session
  // identifiers (preferably hashed). The length of the `Session ID` and
  // `User ID` must not exceed 36 characters.
  //
  // For more information, see the [API interactions
  // guide](https://cloud.google.com/dialogflow/docs/api-overview).
  //
  // Note: Always use agent versions for production traffic.
  // See [Versions and
  // environments](https://cloud.google.com/dialogflow/es/docs/agents-versions).
  string session = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {
      type: "dialogflow.googleapis.com/Session"
    }
  ];

  // The parameters of this query.
  QueryParameters query_params = 2;

  // Required. The input specification. It can be set to:
  //
  // 1.  an audio config which instructs the speech recognizer how to process
  //     the speech audio,
  //
  // 2.  a conversational query in the form of text, or
  //
  // 3.  an event that specifies which intent to trigger.
  QueryInput query_input = 3 [(google.api.field_behavior) = REQUIRED];

  // Please use
  // [InputAudioConfig.single_utterance][google.cloud.dialogflow.v2.InputAudioConfig.single_utterance]
  // instead. If `false` (default), recognition does not cease until the client
  // closes the stream. If `true`, the recognizer will detect a single spoken
  // utterance in input audio. Recognition ceases when it detects the audio's
  // voice has stopped or paused. In this case, once a detected intent is
  // received, the client should close the stream and start a new request with a
  // new stream as needed. This setting is ignored when `query_input` is a piece
  // of text or an event.
  bool single_utterance = 4 [deprecated = true];

  // Instructs the speech synthesizer how to generate the output
  // audio. If this field is not set and agent-level speech synthesizer is not
  // configured, no output audio is generated.
  OutputAudioConfig output_audio_config = 5;

  // Mask for
  // [output_audio_config][google.cloud.dialogflow.v2.StreamingDetectIntentRequest.output_audio_config]
  // indicating which settings in this request-level config should override
  // speech synthesizer settings defined at agent-level.
  //
  // If unspecified or empty,
  // [output_audio_config][google.cloud.dialogflow.v2.StreamingDetectIntentRequest.output_audio_config]
  // replaces the agent-level config in its entirety.
  google.protobuf.FieldMask output_audio_config_mask = 7;

  // The input audio content to be recognized. Must be sent if
  // `query_input` was set to a streaming input audio config. The complete audio
  // over all streaming messages must not exceed 1 minute.
  bytes input_audio = 6;

  // if true, `StreamingDetectIntentResponse.debugging_info` will get populated.
  bool enable_debugging_info = 8;
}

// Cloud conversation info for easier debugging.
// It will get populated in `StreamingDetectIntentResponse` or
// `StreamingAnalyzeContentResponse` when the flag `enable_debugging_info` is
// set to true in corresponding requests.
message CloudConversationDebuggingInfo {
  // Number of input audio data chunks in streaming requests.
  int32 audio_data_chunks = 1;

  // Time offset of the end of speech utterance relative to the
  // beginning of the first audio chunk.
  google.protobuf.Duration result_end_time_offset = 2;

  // Duration of first audio chunk.
  google.protobuf.Duration first_audio_duration = 3;

  // Whether client used single utterance mode.
  bool single_utterance = 5;

  // Time offsets of the speech partial results relative to the beginning of
  // the stream.
  repeated google.protobuf.Duration speech_partial_results_end_times = 6;

  // Time offsets of the speech final results (is_final=true) relative to the
  // beginning of the stream.
  repeated google.protobuf.Duration speech_final_results_end_times = 7;

  // Total number of partial responses.
  int32 partial_responses = 8;

  // Time offset of Speaker ID stream close time relative to the Speech stream
  // close time in milliseconds. Only meaningful for conversations involving
  // passive verification.
  int32 speaker_id_passive_latency_ms_offset = 9;

  // Whether a barge-in event is triggered in this request.
  bool bargein_event_triggered = 10;

  // Whether speech uses single utterance mode.
  bool speech_single_utterance = 11;

  // Time offsets of the DTMF partial results relative to the beginning of
  // the stream.
  repeated google.protobuf.Duration dtmf_partial_results_times = 12;

  // Time offsets of the DTMF final results relative to the beginning of
  // the stream.
  repeated google.protobuf.Duration dtmf_final_results_times = 13;

  // Time offset of the end-of-single-utterance signal relative to the
  // beginning of the stream.
  google.protobuf.Duration single_utterance_end_time_offset = 14;

  // No speech timeout settings observed at runtime.
  google.protobuf.Duration no_speech_timeout = 15;

  // Whether the streaming terminates with an injected text query.
  bool is_input_text = 16;

  // Client half close time in terms of input audio duration.
  google.protobuf.Duration client_half_close_time_offset = 17;

  // Client half close time in terms of API streaming duration.
  google.protobuf.Duration client_half_close_streaming_time_offset = 18;
}

// The top-level message returned from the
// `StreamingDetectIntent` method.
//
// Multiple response messages can be returned in order:
//
// 1.  If the `StreamingDetectIntentRequest.input_audio` field was
//     set, the `recognition_result` field is populated for one
//     or more messages.
//     See the
//     [StreamingRecognitionResult][google.cloud.dialogflow.v2.StreamingRecognitionResult]
//     message for details about the result message sequence.
//
// 2.  The next message contains `response_id`, `query_result`
//     and optionally `webhook_status` if a WebHook was called.
message StreamingDetectIntentResponse {
  // The unique identifier of the response. It can be used to
  // locate a response in the training example set or for reporting issues.
  string response_id = 1;

  // The result of speech recognition.
  StreamingRecognitionResult recognition_result = 2;

  // The result of the conversational query or event processing.
  QueryResult query_result = 3;

  // Specifies the status of the webhook request.
  google.rpc.Status webhook_status = 4;

  // The audio data bytes encoded as specified in the request.
  // Note: The output audio is generated based on the values of default platform
  // text responses found in the `query_result.fulfillment_messages` field. If
  // multiple default text responses exist, they will be concatenated when
  // generating audio. If no default platform text responses exist, the
  // generated audio content will be empty.
  //
  // In some scenarios, multiple output audio fields may be present in the
  // response structure. In these cases, only the top-most-level audio output
  // has content.
  bytes output_audio = 5;

  // The config used by the speech synthesizer to generate the output audio.
  OutputAudioConfig output_audio_config = 6;

  // Debugging info that would get populated when
  // `StreamingDetectIntentRequest.enable_debugging_info` is set to true.
  CloudConversationDebuggingInfo debugging_info = 8;
}

// Contains a speech recognition result corresponding to a portion of the audio
// that is currently being processed or an indication that this is the end
// of the single requested utterance.
//
// While end-user audio is being processed, Dialogflow sends a series of
// results. Each result may contain a `transcript` value. A transcript
// represents a portion of the utterance. While the recognizer is processing
// audio, transcript values may be interim values or finalized values.
// Once a transcript is finalized, the `is_final` value is set to true and
// processing continues for the next transcript.
//
// If `StreamingDetectIntentRequest.query_input.audio_config.single_utterance`
// was true, and the recognizer has completed processing audio,
// the `message_type` value is set to `END_OF_SINGLE_UTTERANCE and the
// following (last) result contains the last finalized transcript.
//
// The complete end-user utterance is determined by concatenating the
// finalized transcript values received for the series of results.
//
// In the following example, single utterance is enabled. In the case where
// single utterance is not enabled, result 7 would not occur.
//
// ```
// Num | transcript              | message_type            | is_final
// --- | ----------------------- | ----------------------- | --------
// 1   | "tube"                  | TRANSCRIPT              | false
// 2   | "to be a"               | TRANSCRIPT              | false
// 3   | "to be"                 | TRANSCRIPT              | false
// 4   | "to be or not to be"    | TRANSCRIPT              | true
// 5   | "that's"                | TRANSCRIPT              | false
// 6   | "that is                | TRANSCRIPT              | false
// 7   | unset                   | END_OF_SINGLE_UTTERANCE | unset
// 8   | " that is the question" | TRANSCRIPT              | true
// ```
//
// Concatenating the finalized transcripts with `is_final` set to true,
// the complete utterance becomes "to be or not to be that is the question".
message StreamingRecognitionResult {
  // Type of the response message.
  enum MessageType {
    // Not specified. Should never be used.
    MESSAGE_TYPE_UNSPECIFIED = 0;

    // Message contains a (possibly partial) transcript.
    TRANSCRIPT = 1;

    // Event indicates that the server has detected the end of the user's speech
    // utterance and expects no additional inputs.
    // Therefore, the server will not process additional audio (although it may
    // subsequently return additional results). The client should stop sending
    // additional audio data, half-close the gRPC connection, and wait for any
    // additional results until the server closes the gRPC connection. This
    // message is only sent if `single_utterance` was set to `true`, and is not
    // used otherwise.
    END_OF_SINGLE_UTTERANCE = 2;
  }

  // Type of the result message.
  MessageType message_type = 1;

  // Transcript text representing the words that the user spoke.
  // Populated if and only if `message_type` = `TRANSCRIPT`.
  string transcript = 2;

  // If `false`, the `StreamingRecognitionResult` represents an
  // interim result that may change. If `true`, the recognizer will not return
  // any further hypotheses about this piece of the audio. May only be populated
  // for `message_type` = `TRANSCRIPT`.
  bool is_final = 3;

  // The Speech confidence between 0.0 and 1.0 for the current portion of audio.
  // A higher number indicates an estimated greater likelihood that the
  // recognized words are correct. The default of 0.0 is a sentinel value
  // indicating that confidence was not set.
  //
  // This field is typically only provided if `is_final` is true and you should
  // not rely on it being accurate or even set.
  float confidence = 4;

  // Word-specific information for the words recognized by Speech in
  // [transcript][google.cloud.dialogflow.v2.StreamingRecognitionResult.transcript].
  // Populated if and only if `message_type` = `TRANSCRIPT` and
  // [InputAudioConfig.enable_word_info] is set.
  repeated SpeechWordInfo speech_word_info = 7;

  // Time offset of the end of this Speech recognition result relative to the
  // beginning of the audio. Only populated for `message_type` = `TRANSCRIPT`.
  google.protobuf.Duration speech_end_offset = 8;

  // Detected language code for the transcript.
  string language_code = 10;
}

// ============================================================================
// Auxiliary proto messages.
//
// Represents the natural language text to be processed.
message TextInput {
  // Required. The UTF-8 encoded natural language text to be processed.
  // Text length must not exceed 256 characters for virtual agent interactions.
  string text = 1 [(google.api.field_behavior) = REQUIRED];

  // Required. The language of this conversational query. See [Language
  // Support](https://cloud.google.com/dialogflow/docs/reference/language)
  // for a list of the currently supported language codes. Note that queries in
  // the same session do not necessarily need to specify the same language.
  string language_code = 2 [(google.api.field_behavior) = REQUIRED];
}

// Events allow for matching intents by event name instead of the natural
// language input. For instance, input `<event: { name: "welcome_event",
// parameters: { name: "Sam" } }>` can trigger a personalized welcome response.
// The parameter `name` may be used by the agent in the response:
// `"Hello #welcome_event.name! What can I do for you today?"`.
message EventInput {
  // Required. The unique identifier of the event.
  string name = 1 [(google.api.field_behavior) = REQUIRED];

  // The collection of parameters associated with the event.
  //
  // Depending on your protocol or client library language, this is a
  // map, associative array, symbol table, dictionary, or JSON object
  // composed of a collection of (MapKey, MapValue) pairs:
  //
  // -   MapKey type: string
  // -   MapKey value: parameter name
  // -   MapValue type:
  //     -   If parameter's entity type is a composite entity: map
  //     -   Else: depending on parameter value type, could be one of string,
  //         number, boolean, null, list or map
  // -   MapValue value:
  //     -   If parameter's entity type is a composite entity:
  //         map from composite entity property names to property values
  //     -   Else: parameter value
  google.protobuf.Struct parameters = 2;

  // Required. The language of this query. See [Language
  // Support](https://cloud.google.com/dialogflow/docs/reference/language)
  // for a list of the currently supported language codes. Note that queries in
  // the same session do not necessarily need to specify the same language.
  //
  // This field is ignored when used in the context of a
  // [WebhookResponse.followup_event_input][google.cloud.dialogflow.v2.WebhookResponse.followup_event_input]
  // field, because the language was already defined in the originating detect
  // intent request.
  string language_code = 3 [(google.api.field_behavior) = REQUIRED];
}

// Configures the types of sentiment analysis to perform.
message SentimentAnalysisRequestConfig {
  // Instructs the service to perform sentiment analysis on
  // `query_text`. If not provided, sentiment analysis is not performed on
  // `query_text`.
  bool analyze_query_text_sentiment = 1;
}

// The result of sentiment analysis. Sentiment analysis inspects user input
// and identifies the prevailing subjective opinion, especially to determine a
// user's attitude as positive, negative, or neutral.
// For [Participants.DetectIntent][], it needs to be configured in
// [DetectIntentRequest.query_params][google.cloud.dialogflow.v2.DetectIntentRequest.query_params].
// For [Participants.StreamingDetectIntent][], it needs to be configured in
// [StreamingDetectIntentRequest.query_params][google.cloud.dialogflow.v2.StreamingDetectIntentRequest.query_params].
// And for
// [Participants.AnalyzeContent][google.cloud.dialogflow.v2.Participants.AnalyzeContent]
// and
// [Participants.StreamingAnalyzeContent][google.cloud.dialogflow.v2.Participants.StreamingAnalyzeContent],
// it needs to be configured in
// [ConversationProfile.human_agent_assistant_config][google.cloud.dialogflow.v2.ConversationProfile.human_agent_assistant_config]
message SentimentAnalysisResult {
  // The sentiment analysis result for `query_text`.
  Sentiment query_text_sentiment = 1;
}

// The sentiment, such as positive/negative feeling or association, for a unit
// of analysis, such as the query text. See:
// https://cloud.google.com/natural-language/docs/basics#interpreting_sentiment_analysis_values
// for how to interpret the result.
message Sentiment {
  // Sentiment score between -1.0 (negative sentiment) and 1.0 (positive
  // sentiment).
  float score = 1;

  // A non-negative number in the [0, +inf) range, which represents the absolute
  // magnitude of sentiment, regardless of score (positive or negative).
  float magnitude = 2;
}