Request image file

Available in Classic and VPC

This document describes examples of using the Request CAPTCHA image file API.

Request CAPTCHA image file

This section describes API examples that request a CAPTCHA image file using an issued CAPTCHA key.

Java

The following is a Java-based sample code for the Request CAPTCHA image file API.

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;

public class APIExamCaptchaNkey {

    public static void main(String[] args) {
        String clientId = "YOUR_CLIENT_ID";//Application's client ID value";
        String clientSecret = "YOUR_CLIENT_SECRET";//Application's client secret value";
        try {
            String code = "0"; // Set to 0 for image file request and 1 for CAPTCHA image comparison
            String apiURL = "https://naveropenapi.apigw.ntruss.com/captcha/v1/nkey?code=" + code;
            URL url = new URL(apiURL);
            HttpURLConnection con = (HttpURLConnection)url.openConnection();
            con.setRequestMethod("GET");
            con.setRequestProperty("X-NCP-APIGW-API-KEY-ID", clientId);
            con.setRequestProperty("X-NCP-APIGW-API-KEY", clientSecret);
            int responseCode = con.getResponseCode();
            BufferedReader br;
            if(responseCode==200) { // Successful call
                br = new BufferedReader(new InputStreamReader(con.getInputStream()));
            } else {  // Error occurred
                br = new BufferedReader(new InputStreamReader(con.getErrorStream()));
            }
            String inputLine;
            StringBuffer response = new StringBuffer();
            while ((inputLine = br.readLine()) != null) {
                response.append(inputLine);
            }
            br.close();
            System.out.println(response.toString());
        } catch (Exception e) {
            System.out.println(e);
        }
    }
}

Python

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

import os
import sys
import urllib.request
client_id = "YOUR_CLIENT_ID"
key = "YOUR_CAPTCHA_KEY" # CAPTCHA key value
url = "https://naveropenapi.apigw.ntruss.com/captcha-bin/v1/ncaptcha?key=" + key + "&X-NCP-APIGW-API-KEY-ID=" + client_id;
request = urllib.request.Request(url)
response = urllib.request.urlopen(request)
rescode = response.getcode()
if(rescode==200):
    print("Save CAPTCHA image")
    response_body = response.read()
    with open('captcha.jpg', 'wb') as f:
        f.write(response_body)
else:
    print("Error Code:" + rescode)

PHP

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

<?php
  $client_id = "YOUR_CLIENT_ID";
  $key = "CAPTCHA_KEY";
  $url = "https://naveropenapi.apigw.ntruss.com/captcha-bin/v1/ncaptcha?key=".$key."&X-NCP-APIGW-API-KEY-ID=".$client_id;
  $is_post = false;
  $ch = curl_init();
  curl_setopt($ch, CURLOPT_URL, $url);
  curl_setopt($ch, CURLOPT_POST, $is_post);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
  $response = curl_exec ($ch);
  $status_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
  echo "status_code:".$status_code."<br />";
  curl_close ($ch);
  if($status_code == 200) {
    //echo $response;
    $fp = fopen("captcha.jpg", "w+");
    fwrite($fp, $response);
    fclose($fp);
    echo "<img src='captcha.jpg'>";
  } else {
    echo "Error content:".$response;
  }
?>

JavaScript

The following is a JavaScript-based sample code for the Request image file API.

var express = require('express');
var app = express();
var client_id = 'YOUR_CLIENT_ID';
var fs = require('fs');
app.get('/captcha/image', function (req, res) {
   var api_url = 'https://naveropenapi.apigw.ntruss.com/captcha-bin/v1/ncaptcha?key=' + req.query.key + "&X-NCP-APIGW-API-KEY-ID=" + client_id;
   var request = require('request');
   var options = {
       url: api_url
    };
    var writeStream = fs.createWriteStream('./captcha.jpg');
    var _req = request.get(options).on('response', function(response) {
       console.log(response.statusCode) // 200
       console.log(response.headers['content-type'])
    });
  _req.pipe(writeStream); // Output to file
  _req.pipe(res); // Output to browser
 });
 app.listen(3000, function () {
   console.log('http://127.0.0.1:3000/captcha/image?key=캡차키 app listening on port 3000!');
 });

C#

The following is a C#-based sample code for the Request image file API.

using System;
using System.Net;
using System.Text;
using System.IO;

namespace NaverAPI_Guide
{
    public class APIExamCaptchaImage
    {
        static void Main(string[] args)
        {
            string key = "KEY-INPUT"; // Key value received from the https://naveropenapi.apigw.ntruss.com/captcha/v1/nkey call
            string url = "https://naveropenapi.apigw.ntruss.com/captcha/v1/ncaptcha?key=" + key + "&X-NCP-APIGW-API-KEY-ID=YOUR-CLIENT-ID";
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            string status = response.StatusCode.ToString();
            Console.WriteLine("status="+ status);
            using (Stream output = File.OpenWrite("c:/captcha.jpg"))
            using (Stream input = response.GetResponseStream())
            {
                input.CopyTo(output);
            }
            Console.WriteLine("c:/captcha.jpg was created");
        }
    }
}