POSTED BY
2023-04-28

最後に、Node.js版です。書式がPythonからNodeに変わっただけで、入出力データは全く同じとなります。

Node.jsのインストールなどはこちら。

Watson SDK for Node.jsをインストール

npm install ibm-watson@^5.1.0

プロキシ環境下固有の修正

プロキシサーバを利用していない場合、飛ばしてください。現バージョンではプロキシ環境下では、SDKを直接修正する必要があります。

tunnelを入れる

npm install tunnel

node_modules/ibm-cloud-sdk-core/lib/request-wrapper.js を直接編集する。

ファイル先頭部にtunnelをrequireする。

"use strict";
var tunnel = require("tunnel");

７０行目あたり～

        // merge valid Axios Config into default.
        extend(true, axiosConfig, allowedAxiosConfig.reduce(function (reducedConfig, key) {
            reducedConfig[key] = axiosOptions[key];
            return reducedConfig;
        }, {}));

        this.axiosInstance = axios_1.default.create(axiosConfig);

となっているところ、間に以下プロキシ記述を追加する。
プロキシサーバーのURLが http://proxy.local.example1155.jp:3128/ であるとすると、

        // merge valid Axios Config into default.
        extend(true, axiosConfig, allowedAxiosConfig.reduce(function (reducedConfig, key) {
            reducedConfig[key] = axiosOptions[key];
            return reducedConfig;
        }, {}));

        var agent = tunnel.httpsOverHttp({
         proxy: {
             host: 'proxy.local.example1155.jp',
             port: 3128,
         },
        });

        axiosConfig.httpsAgent = agent;
        axiosConfig.proxy = false;

        this.axiosInstance = axios_1.default.create(axiosConfig);

と、修正します。

あとは、前回のWatson AssistantをGUIで作成しAPIから呼び出す（Python編）のPythonソースがNode.jsソースになるだけですので、以下、ソースと出力のみ置いておきます。
Assistant ID,API Key,Session IDは自分のものに差し替えてください。

API接続しセッションIDを取得

const AssistantV2 = require('ibm-watson/assistant/v2');
const { IamAuthenticator } = require('ibm-watson/auth');

const service = new AssistantV2({
  version: '2019-02-28',
  authenticator: new IamAuthenticator({
    apikey: 'GGGGGG-KKKKKKKK-VVVVVV-XXXXXX',
  }),
  url: 'https://gateway-tok.watsonplatform.net/assistant/api',
});

service.createSession({
  assistantId: 'aaaaaaaa-bbbbbbb-cccccc-ddddddd'
})
  .then(res => {
    console.log(JSON.stringify(res, null, 2));
  })
  .catch(err => {
    console.log(err);
  });

node watson_create_session.js

{
  "status": 201,
  "statusText": "Created",
  "headers": {
    "content-type": "application/json; charset=utf-8",
    "content-length": "53",
    "access-control-allow-origin": "*",
    "access-control-allow-methods": "GET, POST, PUT, DELETE, PATCH, HEAD, OPTIONS",
    "access-control-allow-headers": "Content-Type, Content-Length, Authorization, X-Watson-Authorization-Token, X-WDC-PL-OPT-OUT, X-Watson-UserInfo, X-Watson-Learning-Opt-Out, X-Watson-Metadata",
    "access-control-max-age": "3600",
    "content-security-policy": "default-src 'none'",
    "x-dns-prefetch-control": "off",
    "x-frame-options": "SAMEORIGIN",
    "strict-transport-security": "max-age=31536000; includeSubDomains;",
    "x-download-options": "noopen",
    "x-content-type-options": "nosniff",
    "x-xss-protection": "1; mode=block",
    "x-response-time": "12.757ms",
    "x-global-transaction-id": "d82240d4719a15b86be4321f8fcef3b7",
    "x-dp-watson-tran-id": "d82240d4719a15b86be4321f8fcef3b7",
    "x-edgeconnect-midmile-rtt": "8",
    "x-edgeconnect-origin-mex-latency": "66",
    "date": "Sun, 01 Dec 2019 10:50:16 GMT",
    "connection": "close"
  },
  "result": {
    "session_id": "b2553333-2ace-4999-855c-da8cb666f39f"
  }
}

会話してみる

const AssistantV2 = require('ibm-watson/assistant/v2');
const { IamAuthenticator } = require('ibm-watson/auth');

const service = new AssistantV2({
  version: '2019-02-28',
  authenticator: new IamAuthenticator({
    apikey: 'GGGGGG-KKKKKKKK-VVVVVV-XXXXXX',
  }),
  url: 'https://gateway-tok.watsonplatform.net/assistant/api',
});

service.message({
  assistantId: 'aaaaaaaa-bbbbbbb-cccccc-ddddddd',
  sessionId: 'b2553333-2ace-4999-855c-da8cb666f39f',
  input: {
    'message_type': 'text',
    'text': '旅行に行きたい',
    'options': {
      'return_context': true
    }
  },
  context: {
    'skills': {
      'main skill': {
        'user_defined': {
          'username': '太郎'
        }
      }
    }
  }
  })
  .then(res => {
    console.log(JSON.stringify(res, null, 2));
  })
  .catch(err => {
    console.log(err);
  });

node watson_send_message_1.js

{
  "status": 200,
  "statusText": "OK",
  "headers": {
    "content-type": "application/json; charset=utf-8",
    "content-length": "312",
    "access-control-allow-origin": "*",
    "access-control-allow-methods": "GET, POST, PUT, DELETE, PATCH, HEAD, OPTIONS",
    "access-control-allow-headers": "Content-Type, Content-Length, Authorization, X-Watson-Authorization-Token, X-WDC-PL-OPT-OUT, X-Watson-UserInfo, X-Watson-Learning-Opt-Out, X-Watson-Metadata",
    "access-control-max-age": "3600",
    "content-security-policy": "default-src 'none'",
    "x-dns-prefetch-control": "off",
    "x-frame-options": "SAMEORIGIN",
    "strict-transport-security": "max-age=31536000; includeSubDomains;",
    "x-download-options": "noopen",
    "x-content-type-options": "nosniff",
    "x-xss-protection": "1; mode=block",
    "x-watson-session-timeout": "session_timeout=300",
    "x-response-time": "62.473ms",
    "x-global-transaction-id": "b8b0c4fed970307e208399419c2163d7",
    "x-dp-watson-tran-id": "b8b0c4fed970307e208399419c2163d7",
    "x-edgeconnect-midmile-rtt": "8",
    "x-edgeconnect-origin-mex-latency": "114",
    "date": "Sun, 01 Dec 2019 10:50:39 GMT",
    "connection": "close"
  },
  "result": {
    "output": {
      "generic": [
        {
          "response_type": "text",
          "text": "太郎さん、国内ですか？海外ですか？"
        }
      ],
      "intents": [
        {
          "intent": "旅行",
          "confidence": 0.9467347621917725
        }
      ],
      "entities": []
    },
    "context": {
      "skills": {
        "main skill": {
          "user_defined": {
            "username": "太郎"
          },
          "system": {}
        }
      },
      "global": {
        "system": {
          "turn_count": 1
        }
      }
    }
  }
}

質問に答えてみる

const AssistantV2 = require('ibm-watson/assistant/v2');
const { IamAuthenticator } = require('ibm-watson/auth');

const service = new AssistantV2({
  version: '2019-02-28',
  authenticator: new IamAuthenticator({
    apikey: 'GGGGGG-KKKKKKKK-VVVVVV-XXXXXX',
  }),
  url: 'https://gateway-tok.watsonplatform.net/assistant/api',
});

service.message({
  assistantId: 'aaaaaaaa-bbbbbbb-cccccc-ddddddd',
  sessionId: 'b2553333-2ace-4999-855c-da8cb666f39f',
  input: {
    'message_type': 'text',
    'text': '行くなら国内がいいです。',
    'options': {
      'return_context': true
    }
  }
  })
  .then(res => {
    console.log(JSON.stringify(res, null, 2));
  })
  .catch(err => {
    console.log(err);
  });

node watson_send_message_2.js

{
  "status": 200,
  "statusText": "OK",
  "headers": {
    "content-type": "application/json; charset=utf-8",
    "content-length": "372",
    "access-control-allow-origin": "*",
    "access-control-allow-methods": "GET, POST, PUT, DELETE, PATCH, HEAD, OPTIONS",
    "access-control-allow-headers": "Content-Type, Content-Length, Authorization, X-Watson-Authorization-Token, X-WDC-PL-OPT-OUT, X-Watson-UserInfo, X-Watson-Learning-Opt-Out, X-Watson-Metadata",
    "access-control-max-age": "3600",
    "content-security-policy": "default-src 'none'",
    "x-dns-prefetch-control": "off",
    "x-frame-options": "SAMEORIGIN",
    "strict-transport-security": "max-age=31536000; includeSubDomains;",
    "x-download-options": "noopen",
    "x-content-type-options": "nosniff",
    "x-xss-protection": "1; mode=block",
    "x-watson-session-timeout": "session_timeout=300",
    "x-response-time": "89.074ms",
    "x-global-transaction-id": "327b5a1cf3bcb014dd3be1f1b0637d03",
    "x-dp-watson-tran-id": "327b5a1cf3bcb014dd3be1f1b0637d03",
    "x-edgeconnect-midmile-rtt": "8",
    "x-edgeconnect-origin-mex-latency": "120",
    "date": "Sun, 01 Dec 2019 10:52:43 GMT",
    "connection": "close"
  },
  "result": {
    "output": {
      "generic": [
        {
          "response_type": "text",
          "text": "そうですか、国内に行きたいんですね太郎さん"
        }
      ],
      "intents": [],
      "entities": [
        {
          "entity": "旅行の種類",
          "location": [
            4,
            6
          ],
          "value": "国内",
          "confidence": 1
        }
      ]
    },
    "context": {
      "skills": {
        "main skill": {
          "user_defined": {
            "username": "太郎",
            "traveltype": "国内"
          },
          "system": {}
        }
      },
      "global": {
        "system": {
          "turn_count": 2
        }
      }
    }
  }
}

以上です。お疲れ様でした。

Watson AssistantをGUIで作成しAPIから呼び出す（準備編）
Watson AssistantをGUIで作成しAPIから呼び出す（Python編）