CLOVA Chatbot examples

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Available in Classic and VPC

This document introduces the CLOVA Chatbot examples.

CLOVA Chatbot

This section describes examples of CLOVA Chatbot APIs that take in user questions and return answers in a variety of ways.

Java

The following is a Java-based sample code for the API.

Call CLOVA Chatbot Custom API

package com.ncp.ai.demo.process;

import android.media.MediaPlayer;
import android.os.Environment;
import android.util.Base64;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.security.Timestamp;
import java.util.Date;

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import android.util.Base64;

import org.json.JSONArray;
import org.json.JSONObject;

public class ChatbotProc {

  public static String main(String voiceMessage, String apiURL, String secretKey) {


        String chatbotMessage = "";

        try {
            //String apiURL = "https://ex9av8bv0e.apigw.ntruss.com/custom_chatbot/prod/";

            URL url = new URL(apiURL);

            String message = getReqMessage(voiceMessage);
            System.out.println("##" + message);

            String encodeBase64String = makeSignature(message, secretKey);

            HttpURLConnection con = (HttpURLConnection)url.openConnection();
            con.setRequestMethod("POST");
            con.setRequestProperty("Content-Type", "application/json;UTF-8");
            con.setRequestProperty("X-NCP-CHATBOT_SIGNATURE", encodeBase64String);

            // post request
            con.setDoOutput(true);
            DataOutputStream wr = new DataOutputStream(con.getOutputStream());
            wr.write(message.getBytes("UTF-8"));
            wr.flush();
            wr.close();
            int responseCode = con.getResponseCode();

            BufferedReader br;

            if(responseCode==200) { // Normal call
                System.out.println(con.getResponseMessage());

                BufferedReader in = new BufferedReader(
                        new InputStreamReader(
                                con.getInputStream()));
                String decodedString;
                while ((decodedString = in.readLine()) != null) {
                    chatbotMessage = decodedString;
                }
                //chatbotMessage = decodedString;
                in.close();

            } else {  // Error occurred
                chatbotMessage = con.getResponseMessage();
            }
        } catch (Exception e) {
            System.out.println(e);
        }

        return chatbotMessage;
    }

    public static String makeSignature(String message, String secretKey) {

        String encodeBase64String = "";

        try {
            byte[] secrete_key_bytes = secretKey.getBytes("UTF-8");

            SecretKeySpec signingKey = new SecretKeySpec(secrete_key_bytes, "HmacSHA256");
            Mac mac = Mac.getInstance("HmacSHA256");
            mac.init(signingKey);

            byte[] rawHmac = mac.doFinal(message.getBytes("UTF-8"));
            encodeBase64String = Base64.encodeToString(rawHmac, Base64.NO_WRAP);

            return encodeBase64String;

        } catch (Exception e){
            System.out.println(e);
        }

        return encodeBase64String;

    }

    public static String getReqMessage(String voiceMessage) {

        String requestBody = "";

        try {

            JSONObject obj = new JSONObject();

            long timestamp = new Date().getTime();

            System.out.println("##"+timestamp);

            obj.put("version", "v2");
            obj.put("userId", "U47b00b58c90f8e47428af8b7bddc1231heo2");
//=> userId is a unique code for each chat user, not a fixed value, recommend use UUID. use different id for each user could help you to split chat history for users.

            obj.put("timestamp", timestamp);

            JSONObject bubbles_obj = new JSONObject();

            bubbles_obj.put("type", "text");

            JSONObject data_obj = new JSONObject();
            data_obj.put("description", voiceMessage);

            bubbles_obj.put("type", "text");
            bubbles_obj.put("data", data_obj);

            JSONArray bubbles_array = new JSONArray();
            bubbles_array.put(bubbles_obj);

            obj.put("bubbles", bubbles_array);
            obj.put("event", "send");

            requestBody = obj.toString();

        } catch (Exception e){
            System.out.println("## Exception : " + e);
        }

        return requestBody;

    }
}

Call ChatbotProc.java in the UI step

package com.example.user.ncpaidemo;

import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.speech.tts.Voice;
import android.util.Log;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import com.naver.speech.clientapi.SpeechRecognitionResult;
import com.ncp.ai.demo.process.ChatbotProc;
import com.ncp.ai.demo.process.CsrProc;
import com.ncp.ai.demo.process.CssProc;
import com.ncp.ai.utils.AudioWriterPCM;

import org.json.JSONArray;
import org.json.JSONObject;

import java.lang.ref.WeakReference;
import java.util.List;

public class VoiceChatbotActivity extends BaseActivity {

    private static final String TAG = VoiceChatbotActivity.class.getSimpleName();
    private RecognitionHandler handler;
    private CsrProc naverRecognizer;
    private TextView txtResult;
    private Button btnStart;
    private String mResult;
    private AudioWriterPCM writer;
    private String clientId;
    private String clientSecret;
    // Handle speech recognition Messages.
    private void handleMessage(Message msg) {
        switch (msg.what) {
            case R.id.clientReady: // Voice recognition ready
                txtResult.setText("Connected");
                writer = new AudioWriterPCM(Environment.getExternalStorageDirectory().getAbsolutePath() + "/NaverSpeechTest");
                writer.open("Test");
                break;
            case R.id.audioRecording:
                writer.write((short[]) msg.obj);
                break;
            case R.id.partialResult:
                mResult = (String) (msg.obj);
                mResult += mResult;
                txtResult.setText(mResult);
                break;
            case R.id.finalResult: // Final recognition result
                SpeechRecognitionResult speechRecognitionResult1 = (SpeechRecognitionResult) msg.obj;
                List<String> results1 = speechRecognitionResult1.getResults();
                StringBuilder strBuf1 = new StringBuilder();
                for(String result : results1) {
                    strBuf1.append(result);
                    //strBuf.append("\n");
                    break;
                }
                mResult = strBuf1.toString();
                txtResult.setText(mResult);

                requestChatbot();

                break;
            case R.id.recognitionError:
                if (writer != null) {
                    writer.close();
                }
                mResult = "Error code : " + msg.obj.toString();
                txtResult.setText(mResult);
                btnStart.setText(R.string.str_start);
                btnStart.setEnabled(true);
                break;
            case R.id.clientInactive:
                if (writer != null) {
                    writer.close();
                }
                btnStart.setText(R.string.str_start);
                btnStart.setEnabled(true);
                break;
        }
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_voice_chatbot);
        SharedPreferences sharedPref = getSharedPreferences("PREF", Context.MODE_PRIVATE);

        clientId = sharedPref.getString("application_client_id", "");
        clientSecret = sharedPref.getString("application_client_secret", "");

        txtResult = (TextView) findViewById(R.id.textViewVoiceChatbotResult);
        btnStart = (Button) findViewById(R.id.btn_voice_chatbot1);
        handler = new RecognitionHandler(this);
        //naverRecognizer = new CsrProc(this, handler, clientId);
        naverRecognizer = CsrProc.getCsrProc(this, clientId);
        naverRecognizer.setHandler(handler);
        btnStart.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                if (!naverRecognizer.getSpeechRecognizer().isRunning()) {

                    mResult = "";
                    txtResult.setText("Connecting...");
                    btnStart.setText(R.string.str_stop);
                    naverRecognizer.recognize();
                } else {
                    Log.d(TAG, "stop and wait Final Result");
                    btnStart.setEnabled(false);
                    naverRecognizer.getSpeechRecognizer().stop();
                }
            }
        });

        Button voiceChatbotReplay;

        voiceChatbotReplay = (Button) findViewById(R.id.btn_voice_chatbot_replay);
        voiceChatbotReplay.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {

                TextView txtResult = (TextView) findViewById(R.id.text_voice_chatbot_replay);
                CSSExecute(txtResult.getText().toString());

            }
        });
    }

    private void requestChatbot() {

        SharedPreferences sharedPref = getSharedPreferences("PREF", Context.MODE_PRIVATE);

        String chatbotApiGwUrl = sharedPref.getString("chatbot_api_gw_url", "");
        String chatbotSecretKey = sharedPref.getString("chatbot_secret_key", "");

        TextView csrSourceText = (TextView)findViewById(R.id.textViewVoiceChatbotResult);
        String text = csrSourceText.getText().toString();

        VoiceChatbotActivity.VoiceChatbotTask task = new VoiceChatbotActivity.VoiceChatbotTask();
        task.execute(text, chatbotApiGwUrl, chatbotSecretKey);
    }

    @Override
    protected void onStart() {
        super.onStart(); // Voice recognition server initialization is here
        naverRecognizer.getSpeechRecognizer().initialize();
    }
    @Override
    protected void onResume() {
        super.onResume();
        mResult = "";
        txtResult.setText("");
        btnStart.setText(R.string.str_start);
        btnStart.setEnabled(true);
    }
//    @Override
//    protected void onStop() {
//        System.out.println("voice chatbot End!!!");
//        super.onStop(); // terminate voice recognition server
//        naverRecognizer.getSpeechRecognizer().release();
//    }
    // Declare handler for handling SpeechRecognizer thread's Messages.
    static class RecognitionHandler extends Handler {
        private final WeakReference<VoiceChatbotActivity> mActivity;
        RecognitionHandler(VoiceChatbotActivity activity) {
            mActivity = new WeakReference<VoiceChatbotActivity>(activity);
        }
        @Override
        public void handleMessage(Message msg) {
            VoiceChatbotActivity activity = mActivity.get();
            if (activity != null) {
                activity.handleMessage(msg);
            }
        }
    }

    public class VoiceChatbotTask extends AsyncTask<String, String, String> {

        @Override
        public String doInBackground(String... strings) {

            return ChatbotProc.main(strings[0], strings[1], strings[2]);
        }

        @Override
        protected void onPostExecute(String result) {

            ReturnThreadResult(result);
        }
    }

    public String ReturnThreadResult(String result) {

        //{"version":"v2","userId":"U47b00b58c90f8e47428af8b7bddc1231heo2","sessionId":"617666","timestamp":1546593912020,
        // "bubbles":[{"type":"template","data":{"cover":{"type":"text","data":{"description":"b"}},"contentTable":[[{"rowSpan":1,"colSpan":1,"data":{"type":"button","title":"b","data":{"type":"basic","action":{"type":"link","data":{"url":"https://www.ncloud.com/product"}}}}}],[{"rowSpan":1,"colSpan":1,"data":{"type":"button","title": "b","data":{"type":"basic","action":{"type":"link","data":{"url":"https://www.ncloud.com/product"}}}}}]]}}],"event":"send"}

        //{"version":"v2","userId":"U47b00b58c90f8e47428af8b7bddc1231heo2","sessionId":"641799","timestamp":1546777198124,
        // "bubbles":[{"type":"text","data":{"description":"b"}}],"event":"send"}
        String chatbotMessage =  "";
        String rlt = result;
        try{
            JSONObject jsonObject = new JSONObject(rlt);
            JSONArray bubbles = jsonObject.getJSONArray("bubbles");

            for (int i =0; i < bubbles.length(); i++){

                JSONObject bubble = bubbles.getJSONObject(i);

                String chatType = bubble.getString("type");

                if (chatType.equals("text")){

                    chatbotMessage = bubble.getJSONObject("data").getString("description");

                }else if (chatType.equals("template")) {

                    chatbotMessage = bubble.getJSONObject("data").getJSONObject("cover").getJSONObject("data").getString("description");

                }else {
                    chatbotMessage = "";
                }

                TextView txtResult = (TextView) findViewById(R.id.text_voice_chatbot_replay);
                txtResult.setText(chatbotMessage);

                break;
            }

        } catch (Exception e) {
            System.out.println(e);
        }

        CSSExecute(chatbotMessage);

        return chatbotMessage;
    }

    private void CSSExecute(String message) {

        VoiceChatbotActivity.NaverTTSTask tts = new VoiceChatbotActivity.NaverTTSTask();
        tts.execute(message, "mijin", clientId, clientSecret);
    }

    public class NaverTTSTask extends AsyncTask<String, String, String> {

        @Override
        public String doInBackground(String... strings) {
            System.out.println(strings[1]);
            CssProc.main(strings[0], strings[1], strings[2], strings[3]);
            return null;
        }
    }
}

Python

The following is a Python-based sample code for the API.

import hashlib
import hmac
import base64
import time
import requests
import json


class ChatbotMessageSender:

    # chatbot api gateway url
    ep_path = ''
    # chatbot custom secret key
    secret_key = ''

    def req_message_send(self):

        timestamp = self.get_timestamp()
        request_body = {
            'version': 'v2',
            'userId': 'U47b00b58c90f8e47428af8b7bddcda3d1111111',
            'timestamp': timestamp,
            'bubbles': [
                {
                    'type': 'text',
                    'data': {
                        'description': 'About Me'
                    }
                }
            ],
            'event': 'send'
        }

        ## Request body
        encode_request_body = json.dumps(request_body).encode('UTF-8')

        ## make signature
        signature = self.make_signature(self.secret_key, encode_request_body)

        ## headers
        custom_headers = {
            'Content-Type': 'application/json;UTF-8',
            'X-NCP-CHATBOT_SIGNATURE': signature
        }

        print("## Timestamp : ", timestamp)
        print("## Signature : ", signature)
        print("## headers ", custom_headers)
        print("## Request Body : ", encode_request_body)

        ## POST Request
        response = requests.post(headers=custom_headers, url=self.ep_path, data=encode_request_body)

        return response

    @staticmethod
    def get_timestamp():
        timestamp = int(time.time() * 1000)
        return timestamp

    @staticmethod
    def make_signature(secret_key, request_body):

        secret_key_bytes = bytes(secret_key, 'UTF-8')

        signing_key = base64.b64encode(hmac.new(secret_key_bytes, request_body, digestmod=hashlib.sha256).digest())

        return signing_key


if __name__ == '__main__':

    res = ChatbotMessageSender().req_message_send()

    print(res.status_code)
    if(res.status_code == 200):
        print(res.text)
        #print(res.read().decode("UTF-8"))

PHP

The following is a PHP-based sample code for the API.

function makeSignature($secretKey, $requestBody) {
  $signautue = base64_encode(hash_hmac('sha256', $requestBody, $secretKey,true));
  //echo "this is signiture : ".$signautue."\n";
  return $signautue;
}


try {
  // User IP
  if (isset($_SERVER['HTTP_X_FORWARDED_FOR']) && $_SERVER['HTTP_X_FORWARDED_FOR']) {
      $clientIpAddress = $_SERVER['HTTP_X_FORWARDED_FOR'];
  } else {
      $clientIpAddress = $_SERVER['HTTP_X_FORWARDED_FOR'];
  }


  $timestamp = "";
  $microtime = "";
  list($microtime,$timestamp) = explode(' ',microtime());
  $timestamp = $timestamp.substr($microtime, 2, 3);

  $url = "https://xi3mfpym2x.apigw.ntruss.com/send/beta/";

  $requestBody=  '{
    "version": "v2",
    "userId": "U47b00b58c90f8e47428af8b7bddcda3d231",
    "userIp": "'.$clientIpAddress.'",
    "timestamp": '.$timestamp.',
    "bubbles": [
      {
        "type": "text",
        "data" : {
          "description" : "postback text of welcome action"
        }
      }
    ],
    "event": "open"
  }';

  $secretKey = "YnVFTWZDemt3bUZhaEJlalN1Z3ZNY2pzeVp0aVRjd04=12";
  $signautue = makeSignature($secretKey,$requestBody);

  $is_post = true;

  $ch = curl_init();
  curl_setopt($ch, CURLOPT_URL, $url);
  curl_setopt($ch, CURLOPT_POST, true);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
  curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
  curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
  curl_setopt($ch, CURLOPT_POSTFIELDS, $requestBody);
  $headers = array();
  $headers[] = "Content-Type:application/json; charset=utf-8";
  $headers[] = "X-NCP-CHATBOT_SIGNATURE: " .$signautue;
  curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);

  $response = curl_exec($ch);
  $err = curl_error($ch);
  curl_close ($ch);
  if ($err) {
    echo "cURL Error #:" . $err;
  } else {
    echo $response;
  }

} catch(Exception $E) {
    echo "Response: ". $E->lastResponse . "\n";
}
?>

Swift

The following is a Swift-based sample code for the API.

import UIKit
import CommonCrypto


// chatbot custom secret key
let secret_key = "";

// chatbot api gateway url
let invoke_url = "";

class ViewController: UIViewController, URLSessionDelegate {

    override func viewDidLoad() {
        super.viewDidLoad()
        demo()
    }

    func demo() {
        let timeInterval: TimeInterval = NSDate().timeIntervalSince1970
        let millisecond = CLongLong(round(timeInterval*1000))

        let body = ["bubbles":[["data": ["description":"test"],
                                "type":"text"]],
                    "event":"send",
                    "timestamp":millisecond,
                    "userId":"test",
                    "version":"v2"] as NSDictionary

        do {
            let jsonDataFromBody = try JSONSerialization.data(withJSONObject: body, options: JSONSerialization.WritingOptions.prettyPrinted)
            let jsonBytes = [CUnsignedChar](jsonDataFromBody)
            let jsonBytesPointer = UnsafePointer<CUnsignedChar>(jsonBytes) //UnsafeRawPointer

            let cKey = secret_key.cString(using: String.Encoding.utf8)
            let digestLen = Int(CC_SHA256_DIGEST_LENGTH)
            let sha256 = UnsafeMutablePointer<CUnsignedChar>.allocate(capacity: digestLen)
            CCHmac(CCHmacAlgorithm(kCCHmacAlgSHA256), cKey, secret_key.lengthOfBytes(using: String.Encoding.utf8), jsonBytesPointer, jsonBytes.count, sha256)

            let base64_sha256 = Data.init(bytes: sha256, count: Int(CC_SHA256_DIGEST_LENGTH)).base64EncodedString()

            httpsRequest("X-NCP-CHATBOT_SIGNATURE", base64_sha256, body: jsonDataFromBody)
            sha256.deallocate()

        } catch {
            print(error)
        }

    }

    func httpsRequest(_ signHeaderKey:String, _ signature:String, body:Data) {
        let url = URL.init(string: invoke_url)!
        var request = URLRequest.init(url: url)
        request.addValue(signature, forHTTPHeaderField: signHeaderKey)
        request.addValue("application/json", forHTTPHeaderField: "Content-Type")
        request.httpMethod = "POST"
        request.httpBody = body

        let session = URLSession.shared
        let task = session.dataTask(with: request) { (data:Data?, response:URLResponse?, error:Error?) in
            print(String.init(data:data!, encoding: .utf8)!)
        }
        task.resume()
    }

    func urlSession(_ session: URLSession, didReceive challenge: URLAuthenticationChallenge, completionHandler: @escaping (URLSession.AuthChallengeDisposition, URLCredential?) -> Void) {
        if challenge.protectionSpace.authenticationMethod != NSURLAuthenticationMethodServerTrust {
            return
        }
        let credential = URLCredential.init(trust: challenge.protectionSpace.serverTrust!)
        completionHandler(URLSession.AuthChallengeDisposition.useCredential, credential)
    }

}

Objective-C

The following is a Objective-C-based sample code for the API.

#import "ViewController.h"
#import <UIKit/UIKit.h>
#import <CommonCrypto/CommonHMAC.h>

// chatbot custom secret key
static NSString *secret_key = @"";

// chatbot api gateway url
static NSString *invoke_url = @"";

@interface ViewController () <NSURLSessionDelegate>

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    [self demo];
}

- (void)demo {
    NSTimeInterval time = [[NSDate date] timeIntervalSince1970]*1000;
    long long millisecond = [[NSNumber numberWithDouble:time] longLongValue];
    NSDictionary *body = @{@"bubbles":@[@{@"data":@{@"description":@"test"},
                                          @"type":@"text"}],
                           @"event":@"send",
                           @"timestamp":millisecond,
                           @"userId":@"U47b00b58c90f8e47428af8b7bddcda3d1111111",
                           @"version":@"v2"
                           };
    NSError *error;

    NSData *jsondataFrombody = [NSJSONSerialization dataWithJSONObject:body
                                                           options:0
                                                             error:&error];

    const char *cKey = [secret_key cStringUsingEncoding:NSUTF8StringEncoding];
    NSMutableData* sha256 = [NSMutableData dataWithLength:CC_SHA256_DIGEST_LENGTH];
    CCHmac(kCCHmacAlgSHA256, cKey, secret_key.length, jsondataFrombody.bytes, jsondataFrombody.length, sha256.mutableBytes);

    NSString *base64_sha256 = [sha256 base64EncodedStringWithOptions:0];

    [self httpsRequest:@"X-NCP-CHATBOT_SIGNATURE" signature:base64_sha256 bodyData:jsondataFrombody];
}

- (void)httpsRequest:(NSString *)signHeaderKey signature:(NSString *)sign bodyData:(NSData *)bodyData  {
    NSURL *url = [NSURL URLWithString:invoke_url];
    NSMutableURLRequest *mRequest = [NSMutableURLRequest requestWithURL:url];
    [mRequest setValue:sign forHTTPHeaderField:signHeaderKey];
    [mRequest setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
    mRequest.HTTPMethod = @"POST";
    mRequest.HTTPBody = bodyData;

    NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]
                                                          delegate:self
                                                     delegateQueue:[NSOperationQueue mainQueue]];//replace delegateQueue with your workingQueue
    NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:mRequest completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
        NSLog(@"response: %@", [response description]);
        NSLog(@"response data:%@",[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]);
    }];
    [dataTask resume];

}

- (void)URLSession:(NSURLSession *)session didReceiveChallenge:(NSURLAuthenticationChallenge *)challenge completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition, NSURLCredential * _Nullable))completionHandler {
    if (![challenge.protectionSpace.authenticationMethod isEqualToString:@"NSURLAuthenticationMethodServerTrust"]) {
        return;
    }
    NSURLCredential *credential = [[NSURLCredential alloc] initWithTrust:challenge.protectionSpace.serverTrust];
    completionHandler(NSURLSessionAuthChallengeUseCredential,credential);

}

@end

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